44results about "Cranks" patented technology

The application discloses an adjustable crank structure, which comprises an adjusting block mounting seat, an eccentric adjusting block connected to the adjusting block mounting seat, a rotating axis of the adjusting block mounting seat being parallel to a center line of the eccentric adjusting block with a spacing formed between the rotating axis and the center line, and a motion characteristic of the structure being changed by adjusting the spacing, a connecting rod rotatably connected to the eccentric adjusting block, the connecting rod being capable of reciprocating under the driving of the eccentric adjusting block, power transmission and motion conversion being realized, a connecting shaft assembly hinged with the connecting rod, the connecting shaft assembly being used for connecting a target force receiving shaft, and two adjusting bolts screwed into specific threaded holes of the adjusting block mounting seat and abutting against specific parts of the eccentric adjusting block. The adjusting bolts are rotated and moved along specific directions on the adjusting block mounting seat, the spacing is adjusted by the two adjusting bolts, and thus flexible adjustment of motion parameters of the crank structure is realized.

The invention relates to an assembly (1, 2) comprising a pin (2) and a crank (1), in particular for a turbocharger, the crank (1) having a bore (12) in which a connecting portion (21) of the pin (2) for connecting the pin (2) with the crank (1) is fixed by an interference fit, wherein the bore (12) has a substantially circular cross-section and the connecting portion (21) has a circular cross-section, the cross-section of the bore (12) deviating from the circular shape at at least one location (121) and being larger than the cross-section of the connecting portion (22) at this location (121).

The utility model discloses a modularized crankshaft and an RV speed reducer, and belongs to the field of speed reducers. The shape memory alloy assembly is sleeved outside the central shaft; the first shaft sleeve assembly and the second shaft sleeve assembly are detachably connected outside the shape memory alloy assembly in a sleeving mode, and the first shaft sleeve assembly abuts against the second shaft sleeve assembly. The first shaft sleeve assembly and the second shaft sleeve assembly are the same in structure and each comprise a first shaft sleeve body detachably connected to the outside of the shape memory alloy assembly in a sleeving mode. And the second shaft sleeve body is sleeved outside the first shaft sleeve body. A first flat potential is arranged outside the first shaft sleeve body, a second flat potential is arranged in the second shaft sleeve body, and the first flat potential abuts against the second flat potential. The utility model has the technical effects that the modular performance is good, and the connection performance is good.

A gear motor of an electrical assistance device, in particular for a cycle, includes a gear reducer and an electric motor including a stator and a rotor integral in rotation with a shaft forming the input of the gear reducer. The gear reducer includes a toothed crown integral with the stator, a satellite-carrier fitted to pivot around the shaft, and forming the output of the gear reducer, at least two planet wheels fitted firstly on respective eccentric cams via a respective bearing. The ge ar motor also includes a rotor bearing to center a first end of the shaft on a fixed shaft of the gear motor, and a bearing device including deformable rolling elements. The bearing device is interposed between the satellite-carrier and a cylindrical receptacle which is integral with the stator, to center the shaft in the cylindrical receptacle at a second end.

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.

The invention provides a two-stage compression air compressor, and belongs to the technical field of air compressors. The two-stage oil-free air compressor solves the technical problems that an existing two-stage oil-free air compressor is remarkable in vibration due to unbalanced movement of a piston, fixed in output pressure and lack of adjustment flexibility. The air compressor comprises a driving motor, wherein two output shaft sections of the driving motor respectively drive two first-stage air cylinder assemblies located on the same side of the motor and two second-stage air cylinder assemblies located on the other side of the motor at the same time; the corresponding air cavities of the air cylinder assemblies on the two sides communicate with each other, and the first-stage air outlet cavity and the second-stage air inlet cavity are connected through an intercooling air pipe. Through the opposite arrangement of the two first-stage cylinders and the two second-stage cylinders and the specific phase design, reciprocating inertia force is counteracted in real time, and vibration and noise are greatly reduced; meanwhile, by means of the parallel connection characteristic of the systems on the two sides, the output pressure and power can be conveniently adjusted by controlling operation of the motor on the single side. The device has the advantages of being stable in operation, high in reliability, adjustable in pressure output and high in adaptability.

To facilitate assembly work and inhibit uneven contact between a gear shaft and a gear configured to engage with the gear shaft even if an inclination occurs between the gear shaft and the gear.SOLUTION: A compression ratio variable device 10a includes a gear shaft 52 which has a shaft 55 including a gear 51 for rotating an eccentric cam 31 and forms a power transmission member between a power source 32 and the eccentric cam 31. The shaft 55 and the gear 51 are formed separately. The shaft 55 has a spline shaft 55a, configured to fit in a spline hole 51a provided at the gear 51, at one end.SELECTED DRAWING: Figure 4

The utility model provides an eccentric mechanism of an air compressor, and belongs to the technical field of air compressors. The air compressor solves the problems that an existing air compressor is low in acting efficiency, and stress is unbalanced when a main shaft works. The eccentric mechanism of the air compressor comprises a main shaft, one end of the main shaft is sleeved with a first eccentric wheel, a second eccentric wheel, a third eccentric wheel and a fourth eccentric wheel, and the first eccentric wheel, the second eccentric wheel, the third eccentric wheel and the fourth eccentric wheel are freely and smoothly arranged in the axial direction of the main shaft. The second eccentric wheel deflects around the main shaft by an angle alpha which is larger than or equal to 0 degree and smaller than or equal to 180 degrees relative to the first eccentric wheel, the third eccentric wheel deflects around the main shaft by 180 degrees relative to the first eccentric wheel, and the fourth eccentric wheel deflects around the main shaft by 180 degrees relative to the second eccentric wheel. According to the structure, the vibration and noise of the whole machine during working are reduced, the working efficiency of the air compressor is improved, the arrangement of the four eccentric wheels on the main shaft can be changed in any sequence according to the structural design of the air compressor, and the position arrangement flexibility of the four eccentric wheels is improved.

The utility model discloses an eccentric wheel structure which comprises an upper ring body and a lower ring body, the upper ring body is arranged above the lower ring body, a connecting hole is formed in the center of the upper ring body and the center of the lower ring body, an outer ring on one side of the upper ring body is a perfect circular arc, an outer ring on the other side of the upper ring body is a non-perfect circular arc, and a semicircular disc-shaped protruding block corresponding to the non-perfect circular arc is arranged on the lower ring body. A plurality of grooves are formed in the connecting hole; the whole body is integrally formed through metal powder sintering. The eccentric wheel is reasonable and ingenious in structural design, the integrally-formed structure is high in structural strength, the contact face of the connecting part is increased due to superposition of the upper ring body and the lower ring body, the eccentric wheel is not prone to deformation, and the performance of the eccentric wheel is improved.

An assembly of a connecting rod and a crankshaft including a pair of crank webs 6 and a crank pin 5. A reservoir 21 for lubricating oil between a big end 10 of the conrod and the crank pin, and a jett

The utility model relates to the technical field of compressors, and discloses a crankshaft of a reciprocating compressor, which comprises a main journal, balance blocks are fixedly mounted on two sides of the main journal, a first piston rod journal is fixedly mounted on one side, far away from the main journal, of each balance block, and a second connecting handle is fixedly mounted on one side, far away from the corresponding balance block, of each first piston rod journal. A crank is fixedly installed on the side, away from the first piston rod journal, of the second connecting handle, and a second piston rod journal is fixedly installed on the side, away from the second connecting handle, of the crank. Through cooperative use of an oil liquid injection groove and an oil liquid storage groove, the outer edges of the first piston rod journal and the second piston rod journal need to be lubricated, so that when the first piston rod journal and the second piston rod journal are slidably connected with the piston rod in a sleeving mode more smoothly, the first piston rod journal and the second piston rod journal need to be lubricated before the first piston rod journal and the second piston rod journal are not connected with the piston rod; lubricating oil is poured into the inner wall of the oil storage tank through the oil injection tank.

The invention discloses a driving device (10) for output movement of a displacement element. The driving device comprises a connecting rod (12) connected with the displacement element. The drive device (10) comprises a crank (22) and an eccentric unit (26). According to the invention, the eccentric unit (26) has a mechanical setting device (36) comprising a setting element (38) acting on the eccentric element (40), the setting device (36) being configured such that the setting element (38) can be in different setting positions, for example in different positions and / or orientations, with respect to the crank axis of rotation, the setting element (38) being lockable in the setting positions, for example in different positions and / or orientations. And the eye-shaped bearing shaft (ALA) is assigned to a set position around the rotation track of the crank rotation shaft (KDA).

The utility model relates to the technical field of crankshafts, in particular to a crankshaft of a double-cylinder outboard engine, which comprises a first crank throw and a second crank throw, the first crank throw comprises a first crank wall A and a first crank wall B, the first crank wall B is arranged on one side of the first crank wall A, and first inserting columns are arranged on one side of the first crank wall A and one side of the first crank wall B; the first crank wall A and the first crank wall B are connected together through a first connecting sleeve and a first inserting column to form a complete first crank throw, the second crank wall A and the second crank wall B form a complete second crank throw through a second connecting sleeve and a second inserting column, and the first crank throw and the second crank throw are installed together through a crank neck sleeve and a short butt joint column. The front end shaft is installed on one side of the first crank throw through the second butt-joint groove and the long butt-joint column, the rear end shaft is installed on one side of the second crank throw through the first butt-joint groove and the middle butt-joint column, installation and disassembly are convenient, and the rear end shaft can be independently disassembled to be replaced.

Provided is a sliding member capable of stably reducing the frictional resistance of a sliding surface accompanying eccentric rotation. A sliding member (7) is in the shape of a circular ring in which a high-pressure fluid and a low-pressure fluid exist on the inner and outer surfaces, has a sliding surface (7a) that slides in opposition to each other accompanying eccentric rotation, and in which a plurality of high-pressure grooves (71) that open to a space (50) in which the high-pressure fluid exists and a plurality of low-pressure grooves (72) that open to a space (20) in which the low-pressure fluid exists are respectively provided on the sliding surface (7a) in the circumferential direction.

The improved driving device for the washing tower comprises a motor, a speed reducer and an eccentric wheel assembly, one side of the eccentric wheel assembly is connected with an adjusting support a, a seat frame and a rolling bearing seat, the other side of the eccentric wheel assembly is connected with the motor through a pin coupling a, and the motor and the speed reducer are connected together through a pin coupling b. The eccentric wheel assembly comprises eccentric wheels, an eccentric shaft and a balancing weight, a rolling bearing is arranged on the eccentric shaft, the eccentric wheels are symmetrically installed on the two sides of the rolling bearing, three rows of holes are symmetrically formed in the eccentric shaft, and the balancing weight is connected through the three rows of holes. The eccentric wheel assembly is arranged on the driving device, the eccentric wheels are symmetrically arranged, so that the torque on the eccentric shaft is in a static balance state, the output torque of the speed reducer is stable, the tooth hitting phenomenon of a low-speed end gear disappears, the driving device does not generate other noise except the noise of the motor and the speed reducer, and the load requirement of the motor is stable; the motor current is stable.

The utility model provides an air compressor, and belongs to the technical field of air compressors. The single-head four-cylinder air compressor solves the problems that an existing single-head four-cylinder air compressor is large in vibration and noise in the working process. The air compressor comprises a main shaft, two first connecting rod assemblies and two second connecting rod assemblies, the two first connecting rod assemblies and the two second connecting rod assemblies are distributed around the main shaft in a crossed mode, the front end of the main shaft is sleeved with a first crank and a second crank, the first crank comprises two first eccentric wheels, and the second crank comprises two second eccentric wheels. The two first connecting rod assemblies are arranged on the corresponding first eccentric wheels in a sleeving mode respectively, the two second connecting rod assemblies are arranged on the corresponding second eccentric wheels in a sleeving mode respectively, and after the main shaft rotates, the two first connecting rod assemblies and the two second connecting rod assemblies can extend outwards to the limiting positions at the same time or retract inwards to the limiting positions at the same time at different rotating angles respectively. According to the structure, vibration and noise of the whole machine during working are reduced, force balance is achieved, the air compressor does work twice when the main shaft rotates by one circle, and good work efficiency is guaranteed.

The application relates to the field of inertial type vibration exciters, in particular to a variable moment eccentric wheel. The application provides a variable moment eccentric wheel which is applied to an inertial type vibration exciter and comprises an axle end mounting plate and a linear slide table module. A key groove hole is formed in the center position of the axle end mounting plate and is used for being connected with a driving shaft of the inertial type vibration exciter through a key, so that the circumferential fixing between the axle end mounting plate and the driving shaft of the inertial type vibration exciter is realized, and the axial fixing between the axle end mounting plate and the driving shaft of the inertial type vibration exciter is kept. Two linear slide table modules are symmetrically mounted on the front surface of the axle end mounting plate, four linear slide table modules are symmetrically mounted on the front and back surfaces of the axle end mounting plate, the counterweight sliding block position of each linear slide table module is adjustable, and the eccentric mass moment of the inertial type vibration exciter is changed. The variable moment eccentric wheel provided by the application can upgrade the traditional eccentric block and the variable force wheel device, and realizes the high-precision and high-reliability on-line stepless adjustment of the eccentric mass moment.

A crankshaft (1, 40, 80) for an internal combustion engine including variable compression ratio comprises a main journal (2, 42, 82) including a crankshaft axis (5, 41, 81), a crankpin (3, 43) including a crankpin axis (7) and a crank web (4, 44, 84) located between the main journal (2, 42, 82) and the crankpin (3, 43, 83) in longitudinal direction of the crankshaft axis (5, 41, 81) and an eccentric member (6, 45, 85) which is mounted on the crankpin (3, 43, 83) and rotatable with respect to the crankpin (3, 43) about the crankpin axis (7) The eccentric member (6, 45, 85) comprises a bearing portion (8, 46, 86) for supporting a big end of a connecting rod, which bearing portion (8, 46, 86) has a centreline extending parallel to the crankpin axis (7), and an external eccentric member gear (9, 48, 87) between the bearing portion (8, 46, 86) and the crank web (4, 44, 84) as seen in longitudinal direction of the crankshaft axis (5, 41, 81). The eccentric member gear (6, 45, 85) is driveably coupled to an external central gear (12, 49, 90) through an external intermediate gear (11, 51, 89). The central gear (12, 49, 90) is fixed to a central shaft (14, 50, 92) which extends through the main journal (2, 42, 82) and through the crank web (4, 44, 84) and which is rotatable with respect to the main journal (2, 42, 82) and the crank web (4, 44, 84). The intermediate gear (11, 51, 89) is rotatably mounted to the crank web (4, 44, 84) and meshes with both the eccentric member gear (9, 48, 87) and the central gear (12, 49, 90). The intermediate gear (11, 51, 89) is mounted to an intermediate gear shaft (13, 60, 91) that is radially supported by both the crank web (4) and a separate supporting element (16), which is attached to the crank web (4) at a circumferential side thereof or by a separate supporting element (53, 94), which is attached to the crank web (44) at a side where the eccentric member (45) is located or at a circumferential side of the crank web (84).

A non-uniform stroke duration apparatus includes a crankshaft including a first main crankshaft and a second main crankshaft coaxially disposed with the first main crankshaft and constantly rotating at the same speed as the first main crankshaft, and having a predetermined crankshaft rotation center, a plurality of pin journal units disposed between the first main crankshaft and the second main crankshaft, and an eccentric rotation transmitter including an internal bracket that rotates around an eccentric axis formed by a pivot angle in a predetermined direction and spaced apart from the crankshaft rotation center by a predetermined eccentric distance, and changing a relative rotation speed of the pin journal units with respect to the crankshaft.

An adjustable stroke mechanism has a housing with a central axis and a wall enclosing a cavity. At least one counterweight is movably disposed within the cavity. A mounting assembly is disposed within the cavity. The mounting assembly has a workpiece attachment mechanism. A stroke adjustor couples the at least one counterweight with the mounting assembly. The stroke adjustor enables the counterweight and mounting assembly to move with respect to one another such that a distance between the counterweight and the mounting assembly is variably adjusted which, in turn, variably adjusts a stroke radius of the workpiece attachment mechanism with respect to the central axis of the housing.

A rotation coupler for an internal combustion engine includes a ring gear configured to rotate about a first axis. The rotation coupler further includes an input pinion gear configured to transfer rotation of a crankshaft of the internal combustion engine to the ring gear to cause the ring gear to rotate about the first axis. The input pinion gear is eccentrically movable relative to the first axis. The rotation coupler further includes an output pinion gear configured to transfer rotation of the ring gear about the first axis to a flywheel of the internal combustion engine.

The utility model relates to the technical field of chain wheel cranks and discloses an anti-dislocation chain wheel crank which comprises a plurality of chain wheels, cranks are arranged on the two sides of the chain wheels, a baffle disc is arranged on one side face of each chain wheel, a circle of connecting plate is fixedly connected to the inner ring of each baffle disc, and the connecting plates are arranged on the two sides of the chain wheels. A threaded hole is formed in the surface of each connecting plate, a plurality of threaded grooves corresponding to the threaded holes are formed in the surface of the chain wheel on the outermost side, and bolts are installed between the corresponding threaded holes and the threaded grooves in a threaded mode. The inner portions of the two cranks are both hollow, openings are formed in one ends of the two cranks, extension handles are installed in the two cranks in a sliding mode, the overall length of the cranks and the extension handles can be rapidly and conveniently adjusted in the using process, and the multifunctional folding chair is suitable for being used by different crowds and high in applicability.

The utility model discloses a steering system eccentric wheel, and particularly relates to the technical field of steering system eccentric wheels, the steering system eccentric wheel comprises a supporting disc, an eccentric supporting assembly is arranged on the supporting disc, and the eccentric supporting assembly comprises a mounting disc arranged at the top of the supporting disc. According to the utility model, parts such as the mounting disc and the limiting sleeve can be driven to rotate around the axis of the supporting disc by detaching the positioning pin or the bolt in the limiting hole, so that large-range coarse adjustment is realized; and the bolts matched with the adjusting grooves and the positioning holes are loosened, so that the bolts move along the arc-shaped adjusting grooves, and small-range fine adjustment can be realized. According to the adjusting mode, the problem that the angle of an existing eccentric wheel cannot be adjusted is effectively solved, the differential requirements of steering systems of different vehicle types for the eccentric angle can be met, the purchase and inventory cost of parts is reduced, after the steering system is abraded, the transmission error can be compensated by adjusting the eccentric angle, and the transmission efficiency is improved. And the steering precision can be recovered without replacing parts.

A crank and linkage assembly for a component of a turbocharger includes a linkage and two cranks each including a pin whose outer surface defines a pin groove. Each end of the linkage defines a through bore for receiving one of the pins. At each end of the linkage, a plurality of fingers arc integrally formed and of one piece with the linkage, the fingers extending parallel to, and circumferentially spaced about, the through bore axis. The fingers are elastically bendable such that the hooks move away from the bore axis and such that a restoring force of each of the fingers acts in a direction to bend the hooks back toward the bore axis. The assembly can be assembled by a push-to-connect process in which each pin is advanced into the respective through bore until the hooks snap into the respective pin groove.

The utility model discloses a crankshaft structure of a motorcycle engine, which comprises two groups of crank components connected with each other, each crank component comprises an inner crank and an outer crank, a piston connecting rod is arranged between the inner crank and the outer crank, the two inner cranks are fixedly connected, and crankshafts are arranged at the outer ends of the two outer cranks. Notches are formed in the two sides of the upper half portion of the outer crank, a first connecting part connected with a piston connecting rod is formed between the two notches, grooves are formed in the two sides of the upper half portion of the inner crank, and a second connecting part connected with the piston connecting rod is formed between the two grooves. The crank has the advantages that the notch or the groove is formed in the crank, so that the weights of the upper part and the lower part of the crank are different, the crank can generate centrifugal force after rotating, the operation efficiency of the piston is higher, and the power consumption of the engine is reduced.

An eccentric slider for a crankshaft, a scroll compressor, and a temperature control device are provided. The eccentric slider has a slider body. An assembly hole is formed in the slider body. The assembly hole allows insertion of an eccentric shaft segment of the crankshaft. An outer peripheral wall surface of the slider body has a bearing surface and a non-bearing surface opposite to the bearing surface. The bearing surface drives an orbiting scroll. A hollow portion is formed on the non-bearing surface. The hollow portion accommodates an oil.

The utility model relates to the technical field of kitchen appliances, and discloses an eccentric wheel, a flexible driving mechanism of a turning plate mechanism and a range hood. The eccentric wheel comprises a body, the outline of the body is a spline curve, and the curvature of the spline curve changes along with rotation of the body, so that the rotation radius of the eccentric wheel changes along with changes of the rotation angle. The flexible driving mechanism of the turning plate mechanism comprises a force storage assembly and a flexible control rope, the force storage assembly comprises a force storage spring and the eccentric wheel, one end of the force storage spring is connected with the second turning plate assembly, the other end of the force storage spring is connected with the eccentric wheel, and the rotation center of the force storage spring and the rotation center of the eccentric wheel are coaxially arranged. The eccentric wheel is connected with the first turning plate assembly, the flexible control rope is connected with the eccentric wheel, and the flexible control rope can drive the eccentric wheel to rotate when tightened, so that the first turning plate assembly and the second turning plate assembly are driven to be turned over and opened successively. The eccentric wheel has the advantage of saving labor, the mechanical efficiency of a system is improved, and meanwhile the jamming phenomenon can be avoided.

The utility model relates to the technical field of chromatographic pumps, in particular to an ultrahigh-pressure liquid chromatographic pump which comprises a bottom plate, a pump body is arranged above the bottom plate and close to the left side, two supporting plates for fixing the pump body are fixed on the upper surface of the bottom plate and close to the left side, and a plunger rod is inserted into the right end of the pump body. Two fixing plates are fixed to the positions, close to the right end, of the upper surface of the bottom plate, a crankshaft is rotationally installed between the two fixing plates, the middle of the crankshaft is sleeved with a rotating sleeve, the right end of the plunger rod is connected with the crankshaft through a connecting rod, the base end of the connecting rod is hinged to the plunger rod, and the right end of the connecting rod is hinged to the rotating sleeve. The swing rods are installed on the two sides of the crankshaft, the connecting columns are clamped on the swing rods, the positions of the connecting columns on the swing rods can be adjusted, and therefore the reciprocating stroke of the plunger rod is changed. The reciprocating distance of the plunger rod can be changed by adjusting the relative position of the connecting column, so that the pumping quantity of the chromatographic pump is adjusted, and different actual use requirements are met.

The utility model relates to the technical field of air compressors, in particular to an eccentric wheel structure and an air compressor. The eccentric wheel structure comprises a first mounting part (1), the interior of the first mounting part is fixedly connected to a rotor shaft (5), the exterior is movably connected with a connecting rod (4), and the connecting rod (4) is driven by the rotor shaft (5) to reciprocate; one end of the second mounting part (2) is fixedly connected with the first mounting part (1) along the axis direction of the rotor shaft (5), and the other end of the second mounting part (2) is fixedly connected with the third mounting part (3) along the radial direction of the rotor shaft (5); and the third mounting part (3) forms a sector ring shape and is used for a counterweight part of the eccentric wheel structure. The eccentric wheel is reasonable in structure, materials used for the second installation part (2) are reduced, the gravity center of the third installation part (3) serving as a balance weight part is moved downwards, and therefore the materials are reduced on the premise that original inertia force is kept unchanged.