CN210034141U - Transmission mechanism of oil-free piston type air compressor and combined crankshaft thereof - Google Patents

Abstract

The utility model relates to an air compressor machine technical field discloses a no oil piston air compressor machine's drive mechanism and combination formula bent axle thereof, including bent axle main part (1), bent axle main part (1) includes bent axle dish (2) and journal (3) of being connected with bent axle dish (2), journal (3) include low pressure axle journal (4) of being connected with low pressure piston assembly (41) and high-pressure axle journal (5) of being connected with high-pressure piston assembly (42), establish respectively in the both sides of bent axle dish (2) low pressure axle journal (4) and high-pressure axle journal (5), low pressure axle journal (4) and high-pressure axle journal (5) are eccentric respectively to be set up in the both sides of bent axle dish (2), low pressure axle journal (4) and high-pressure axle journal (5) parallel arrangement. The utility model discloses combination formula bent axle possess two reel structures that have the flywheel function for the air compressor machine starts and operates more steadily, has reduced the vibration and the noise of machine.

Description

Transmission mechanism of oil-free piston type air compressor and combined crankshaft thereof

Technical Field

The utility model relates to an air compressor machine technical field especially relates to an oil-free piston air compressor machine's drive mechanism and combination formula bent axle thereof.

Background

The lubricating oil is supplemented between the crankshaft and the connecting rod journal of the piston type air compressor with oil lubrication and between the crankshaft journal and a crankcase in a pressure and splashing mode, sliding bearings are adopted between kinematic pairs to reduce friction, the connecting rod is a split connecting rod with a large end and does not need to be sleeved from the shaft end, the two parts can be directly connected and fastened by bolts after being installed at each journal position, the lubricating effect of the oil lubrication is good, the lubricating oil can be used for heat dissipation, but the oil channeling risk exists objectively in the oil lubrication, the early failure of an air part is easy to cause, in addition, the possibility of reverse connection or failure exists in an oil supply system with the oil lubrication, and once the fault occurs, the whole machine can be scrapped. After the oil-free air compressor rises, the crankshaft connecting rod journal adopts the integral rolling bearings to replace the split sliding bearings, so a plurality of problems are brought, because the integral bearings are adopted, the two rolling bearings positioned at the connecting rod journal can only be sleeved from the two ends of the crankshaft, the larger the piston stroke is, the larger the eccentric distance between the main shaft journal and the connecting rod journal is, the larger the connecting rod bearing hole is required to be, and the shaft diameter of each part corresponding to the crankshaft is required to be small to ensure that the bearing can be sleeved, so the rigidity of the crankshaft can not be ensured, the flutter is easy to occur in the movement, the vibration and the noise of the whole machine are increased, and.

The patent No. CN 106438269A provides a transmission mechanism of an oil-free air compressor, which comprises a cylinder body, a crankshaft journal, a connecting rod and a crankcase, wherein the crankshaft is a snake-shaped crank with a large end and a small end, the crankshaft large-end journal is provided with a double-row angular contact ball bearing, and the outer ring of the double-row angular contact ball bearing is fixed on the crankcase; the connecting rod shaft necks on two sides of the bearing are used for mounting the connecting rod big end bearing, and the connecting rod bearing for assembling the low pressure cylinder is required to be slowly sleeved from the shaft end inwards by manpower due to the integral crankshaft, and is pressed in by a press after being in place, so that the assembling process is slow and extremely difficult. In addition, due to the structure of the scheme, the connecting rod of the air compressor can be assembled and realized only by adopting a mode similar to the large-end sectioning of an oil air compressor. The big end of the split connecting rod clamps the big end of the connecting rod radially by adopting a bolt to fasten the bearing, so that the bearing is easy to deform due to uneven clamping force, and the bearing assembled in the mode is easy to loosen due to vibration in the operation process, so that the whole machine is damaged and stopped. In the aspect of processing, the crankshaft and the connecting rod also have the defects of high cost, insufficient precision and the like.

SUMMERY OF THE UTILITY MODEL

The utility model discloses oil-free air compressor machine has cancelled lubricating oil among the prior art, and all bearings have been changed into antifriction bearing, adopt the grease to lubricate the mode, because the grease volume that the bearing self contained is limited, in addition do not have the structure of dedicated storage and supplementary lubricating grease, it is difficult effectively to prevent foreign matters such as dust in the air from invading the bearing inside, in addition probably because the heat that the motion produced can't distribute in time and lead to the fact the grease to run off, the bearing is too early inefficacy, also can't satisfy the long-life requirement of user to the new forms of energy vehicle; the crankshaft of the double-cylinder air compressor is provided with two crankshaft journals and two crank journals, namely a double-crank structure, and the crankshaft can only be designed into a serpentine shaft structure due to the oil-free lubrication design, so that the bearings on the two crankshaft journals can be respectively installed on the respective connecting rod journals from the two ends of the crankshaft, and the big end of the connecting rod is required to be in a cut-open type. The integrated serpentine crankshaft is difficult to machine and high in manufacturing cost; the cutting type connecting rod big-head structure inevitably enables the bearing to be irregularly deformed when being assembled and tightened, the precision of the bearing is affected, the service life of the bearing is shortened, the integral snake-shaped shaft cannot reserve enough parts for dynamic balance adjustment due to structural limitation, the final unbalanced mass of the integral snake-shaped shaft is very large, the defects of vibration and noise optimization of the whole machine are affected, and the transmission mechanism of the oil-free piston type air compressor and the combined crankshaft thereof are long in service life, high in precision, and small in vibration and are caused.

In order to solve the technical problem, the utility model discloses a following technical scheme can solve:

the combined crankshaft comprises a crankshaft main body, wherein the crankshaft main body comprises a crankshaft disc and a journal connected with the crankshaft disc, the journal comprises a low-pressure journal connected with a low-pressure piston assembly and a high-pressure journal connected with a high-pressure piston assembly, the low-pressure journal and the high-pressure journal are respectively arranged on two sides of the crankshaft disc, the low-pressure journal and the high-pressure journal are respectively eccentrically arranged on two sides of the crankshaft disc, and the low-pressure journal and the high-pressure journal are arranged in parallel. The both ends at the same diameter of reel are established to low pressure axle journal and high pressure axle journal symmetry, the tip and the reel of low pressure axle journal are connected, the balancing piece is installed to the tip of high pressure axle journal, after the assembly is accomplished, make up through reel and crankshaft disk and remove the heavy, the focus of this technique is located the central axis of crankshaft disk, can realize the accurate dynamic balance matching of this technique after the assembly is accomplished, when the high-speed rotation of bent axle main part, its rotatory moment of inertia approaches to zero, and certain inertia has, can make the air compressor machine have good acceleration performance under the condition that the air compressor machine can't dispose the flywheel.

Preferably, a shaft disc connected with the low-pressure shaft neck is arranged at the end part of the low-pressure shaft neck, the shaft disc is sleeved on the low-pressure shaft neck, a first threaded hole is formed in the low-pressure shaft neck, the shaft disc is screwed in the first threaded hole through a first bolt and connected with the low-pressure shaft neck, a bolt hole matched with a first bolt head of the first bolt is formed in the shaft disc, a check washer used for preventing the first bolt from loosening is arranged in the bolt hole, the check washer is sleeved on the first bolt, and the check washer is tightly pressed in the bolt hole through the first bolt head. The reel is connected with the low-pressure shaft neck through the first bolt, and the looseness-proof washer prevents the reel from loosening with the low-pressure shaft neck when the reel rotates, so that the stability of installation of the reel and the crankshaft main body is improved.

Preferably, the outer wall of the low-voltage journal is provided with a shaft disc mounting seat and a first deep groove ball bearing seat, the shaft disc mounting seat is arranged on the left side of the first deep groove ball bearing seat, a first step surface is arranged between the shaft disc mounting seat and the first deep groove ball bearing seat, the right end of the shaft disc is provided with a mounting hole, the shaft disc mounting seat is arranged in the mounting hole and abuts against the shaft disc, and the right end of the shaft disc abuts against the first step surface; and a second deep groove ball bearing seat is arranged on the high-pressure shaft neck, and a second step surface is arranged on the left side of the second deep groove ball bearing seat. The shaft disc mounting seat of the low-pressure shaft neck is arranged at the mounting hole and the shaft disc, the first deep groove ball bearing seat is used for mounting a first deep groove ball bearing, the first deep groove ball bearing is fixed in position on the low-pressure shaft neck through a first step surface, and a second step surface is used for fixing the position of a second deep groove ball bearing, so that the stability of parts is improved, the internal structure is more compact, and the mounting space is reduced.

Preferably, the end of the high-pressure shaft neck is provided with a balance block sleeved on the high-pressure shaft neck, a second threaded hole is formed in the high-pressure shaft neck, the balance block is screwed in the second threaded hole through a second bolt and is connected with the high-pressure shaft neck, the end of the high-pressure shaft neck is provided with a circular mounting seat matched with the balance block, the diameter of a cylinder of the circular mounting seat is smaller than that of the high-pressure shaft neck, a flat gasket is sleeved on the second bolt and is arranged between a second bolt head of the second bolt and the circular mounting seat, and the balance block is fixed between the end of the high-pressure shaft. The tip of high-pressure axle journal sets up the balancing piece, balances the focus of this technique, and the balancing piece passes through circular mount pad to be installed at the tip of high-pressure axle journal, has simplified the structure of connecting, and has guaranteed the stability of connecting.

Preferably, the balancing block comprises a connecting portion and a fan-shaped balancing portion, the upper end portion of the connecting portion is connected with the middle portion of the lower end of the fan-shaped balancing portion and is in an integrated structure with the connecting portion, a through hole matched with the circular mounting seat is formed in the connecting portion, an upper groove sunken upwards is formed in the upper end of the through hole, a lower groove sunken downwards is formed in the upper end of the circular mounting seat, and the upper groove and the lower groove are matched to form a key groove hole. The fan-shaped balance part is connected with the high-pressure shaft neck through the connecting part, the center of gravity of the technology during operation is balanced through the fan-shaped balance part, the position of the balance block and the high-pressure shaft neck is fixed through the positioning key arranged in the key groove, the balance block and the high-pressure shaft neck are prevented from rotating relatively, the stability of the balance block during operation is improved, and the three parts of the shaft disc, the crankshaft main body and the balance block jointly form a combined crankshaft which can effectively eliminate the rotating inertia moment and achieve the best balance effect after the optimized design.

The utility model provides an oil-free piston air compressor's drive mechanism, including above the combination formula bent axle, still include the crankcase, the bent axle main part is established in the crankcase, the right side of reel is equipped with second roller bearing frame, the cylinder diameter of second roller bearing frame is less than the cylinder diameter of reel, the cover is equipped with left roller bearing on the second roller bearing frame, be equipped with the mounting groove with left roller bearing adaptation in the crankcase, left roller bearing's right side is equipped with the first supporting sleeve that offsets with left roller bearing right side, first supporting sleeve offsets with left roller bearing's right side, the cover is equipped with the first gland that offsets with left roller bearing left side on the reel. The left roller bearing is fixed through the first support sleeve and the first gland, so that the left roller bearing is prevented from axially moving, and meanwhile, bearing lubricating grease is prevented from being lost.

Preferably, the inner wall of the first gland is provided with a first sealing groove, a first sealing ring matched with the first sealing groove is arranged in the first sealing groove, and the first sealing ring is sleeved on the shaft disc; a second sealing groove is formed in the outer wall of the first supporting sleeve, a second sealing ring matched with the second sealing groove is arranged in the second sealing groove, and the second sealing ring is arranged between the first supporting sleeve and the crankcase. The two sides of the left roller bearing are sealed through the first sealing ring and the second sealing ring, so that pollutants are prevented from entering the left roller bearing, the lubricating grease is prevented from being polluted, and the lubricating grease in the left roller bearing is further prevented from running off.

Preferably, the low-pressure piston type engine also comprises a cylinder body connected with a crankcase, a low-pressure piston assembly and a high-pressure piston assembly are arranged in the cylinder body, a low-pressure connecting rod connected with the low-pressure piston assembly is sleeved on a low-pressure journal, a first deep groove ball bearing sleeved on the low-pressure journal is arranged in the low-pressure connecting rod, the first deep groove ball bearing is arranged on a first deep groove ball bearing seat, a first cover plate sleeved on the low-pressure journal is arranged on the left side of the low-pressure journal, the right side of the first cover plate abuts against the low-pressure connecting rod, the left side of the first cover plate abuts against the right end of a shaft disc, the first cover plate is fixedly connected with the low-pressure connecting rod through a first screw; the high-pressure shaft neck is sleeved with a high-pressure connecting rod connected with the high-pressure piston assembly, a second deep groove ball bearing sleeved on the high-pressure connecting rod is arranged in the high-pressure connecting rod, the second deep groove ball bearing is arranged on a second deep groove ball bearing seat, the left side of the second deep groove ball bearing abuts against a second step surface, a second cover plate sleeved on the high-pressure shaft neck is arranged on the right side of the high-pressure connecting rod, the second cover plate abuts against the right side of the high-pressure connecting rod, the second cover plate is fixedly connected with the high-pressure connecting rod through a second screw, and second adjusting sleeves sleeved on the high-pressure shaft neck are arranged on two. The first deep groove ball bearing is pressed in the low-pressure connecting rod through the first cover plate, the second deep groove ball bearing is pressed in the high-pressure connecting rod through the second cover plate, the low-pressure connecting rod and the high-pressure connecting rod are of an integral structure, bearing holes of the low-pressure connecting rod and the high-pressure connecting rod are stepped, the first deep groove ball bearing and the second deep groove ball bearing can be effectively prevented from loosening, and the roundness of the first deep groove ball bearing and the roundness of the second deep groove ball bearing are guaranteed to the maximum extent, radial deformation of the first deep groove ball bearing and the second deep groove ball bearing is prevented, the first adjusting ring sleeve and the second adjusting ring sleeve are respectively used for adjusting the axial positions of the first deep groove ball bearing and the second deep groove ball bearing, so that the low-pressure connecting rod and the high-pressure connecting rod move up and down on a central axis of a piston hole of the cylinder body all the time, and the first cover plate, the second cover plate, the first adjusting ring sleeve and the second adjusting ring sleeve seal the first deep groove ball bearing and the second deep groove ball bearing, so that bearing grease leakage and external dust entering.

Preferably, the first roller bearing seat is sleeved with a right roller bearing, the left side of the right roller bearing is provided with a second supporting sleeve sleeved on the first roller bearing seat, the outer wall of the second supporting sleeve is provided with a third sealing groove, a third sealing ring adaptive to the third sealing groove is arranged in the third sealing groove, the third sealing ring is arranged between the second supporting sleeve and the crankcase, the right side of the right roller bearing is provided with a second gland, the inner wall of the second gland is provided with a fourth sealing groove, a fourth sealing ring adaptive to the fourth sealing groove is arranged in the fourth sealing groove, and the fourth sealing ring is arranged between the second gland and the crankcase disc. Right roller bearing supports cover and second gland through the second and carries out axial fixity to right roller bearing, prevents right roller bearing axial displacement, and third sealing washer and fourth sealing washer seal right roller bearing's both sides, prevent that the pollutant from getting into right roller bearing in, further prevent the lubricating grease loss in the right roller bearing simultaneously.

The utility model discloses owing to adopted above technical scheme, have apparent technological effect:

1. each moving part of a transmission mechanism of the air compressor adopts a roller bearing to replace a sliding bearing, so that an oil supply system is omitted, the oil content in the compressed air is reduced to zero, and the quality of the compressed air is improved;

2. the combined crankshaft is provided with the crankshaft disc and the shaft disc with the flywheel function, so that the air compressor is more stable to start and operate, and the vibration and noise of the machine are reduced;

3. by adopting a combined crankshaft structure, the deep groove ball bearings on the low-pressure connecting rod and the high-pressure connecting rod are easier to realize mechanical assembly, and the stable and reliable performance of the product can be ensured;

4. all bearings all are equipped with special seal structure for store lubricating grease in sealed cavity, prevent that the bearing from running off and revealing, also can prevent simultaneously that dust in the inside air of crankcase from causing the pollution to bearing lubricating grease, guarantee that the bearing is in operation under the best lubricated state all the time.

Drawings

Fig. 1 is a schematic diagram of the internal structure of the present invention.

Fig. 2 is a partially enlarged view of a portion M in fig. 1.

Fig. 3 is a partially enlarged view of the portion N in fig. 1.

Fig. 4 is a partially enlarged view of the portion O in fig. 1.

Fig. 5 is a partially enlarged view of a portion P in fig. 1.

Fig. 6 is a partially enlarged view of a portion I in fig. 1.

Fig. 7 is a schematic structural view of the crankshaft main body.

Fig. 8 is a schematic structural view of the hub.

Fig. 9 is a schematic structural view of the weight.

Fig. 10 is a schematic view of an assembly structure of the hub and the left roller bearing.

The names of the parts indicated by the numerical references in the drawings are as follows: 1-crankshaft main body, 2-crankshaft disk, 3-journal, 4-low pressure journal, 5-high pressure journal, 6-first roller bearing seat, 7-shaft disk, 8-first threaded hole, 9-first bolt, 10-first bolt head, 11-bolt hole, 12-check washer, 13-shaft disk mounting seat, 14-first deep groove ball bearing seat, 15-first step surface, 16-mounting hole, 17-second deep groove ball bearing seat, 18-second step surface, 19-balance block, 20-second threaded hole, 21-second bolt, 22-circular mounting seat, 23-flat washer, 24-connecting part, 25-sector balance part, 26-through hole, 27-upper groove, 28-lower groove, 29-balance weight hole, 30-crankcase, 31-second roller bearing seat, 32-left roller bearing, 33-mounting groove, 34-first supporting sleeve, 35-first pressing cover, 36-first sealing groove, 37-first sealing ring, 38-second sealing groove, 39-second sealing ring, 40-cylinder, 41-low pressure piston assembly, 42-high pressure piston assembly, 43-low pressure connecting rod, 44-first deep groove ball bearing, 45-first cover plate, 46-first screw, 47-first adjusting ring sleeve, 48-high pressure connecting rod, 49-second deep groove ball bearing, 50-second cover plate, 51-second screw, 52-second adjusting ring sleeve, 53-right roller bearing, 54-second supporting sleeve, 55-third sealing groove, 56-third sealing ring, 57-second gland, 58-fourth sealing groove, 59-fourth sealing ring, 60-second bolt head.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

Example 1

The combined crankshaft, as shown in fig. 1 to 10, includes a crankshaft body 1, the crankshaft body 1 includes a crank disk 2 and a journal 3 connected to the crank disk 2, the journal 3 includes a low pressure journal 4 connected to a low pressure piston assembly 41 and a high pressure journal 5 connected to a high pressure piston assembly 42, the low pressure journal 4 and the high pressure journal 5 are respectively disposed at both sides of the crank disk 2, the low pressure journal 4 and the high pressure journal 5 are respectively eccentrically disposed at both sides of the crank disk 2, and the low pressure journal 4 and the high pressure journal 5 are disposed in parallel. The both ends at the same diameter of reel 7 are established to low pressure axle journal 4 and high pressure axle journal 5 symmetry, the tip and the reel 7 of low pressure axle journal 4 are connected, balancing piece 19 is installed to the tip of high pressure axle journal 5, after the assembly is accomplished, make up through reel 7 and bent axle dish 2 and remove the heavy, the focus of this technique is located the center axis of bent axle dish 2, can realize the accurate dynamic balance of this technique after the assembly is accomplished and match, when bent axle main part 1 rotates at a high speed, its rotatory inertia moment approaches to zero, and certain inertia has, can make the air compressor machine have good acceleration performance under the condition that the air compressor machine can't dispose the flywheel.

The right side of the crank disk 2 is provided with a first roller bearing seat 6 which is concentric with the crank disk 2, the diameter of the cylinder of the crank disk 2 is larger than that of the first roller bearing seat 6, and the low-pressure shaft neck 4 is connected with the first roller bearing seat 6 and is eccentrically arranged on the first roller bearing seat 6. The right roller bearing 53 is conveniently arranged on the first roller bearing seat 6, so that the crank disk 2 is arranged in the crank case 30 through the right roller bearing 53, the internal structure is more compact, and the installation space is saved.

The end of the low-pressure journal 4 is provided with a shaft disc 7 connected with the low-pressure journal 4, the shaft disc 7 is sleeved on the low-pressure journal 4, a first threaded hole 8 is formed in the low-pressure journal 4, the shaft disc 7 is connected with the low-pressure journal 4 in the first threaded hole 8 through a first bolt 9, a bolt hole 11 matched with a first bolt head 10 of the first bolt 9 is formed in the shaft disc 7, a check washer 12 used for preventing the first bolt 9 from loosening is arranged in the bolt hole 11, the check washer 12 is sleeved on the first bolt 9, and the check washer 12 is tightly pressed in the bolt hole 11 through the first bolt head 10. The shaft disc 7 is connected with the low-pressure shaft neck 4 through the first bolt 9, and the locking washer 12 prevents the shaft disc 7 from loosening with the low-pressure shaft neck 4 when the shaft disc 7 rotates, so that the mounting stability of the shaft disc 7 and the crankshaft main body 1 is improved. The shaft disc 7 is a disc part with a driven claw of the coupler, the disc part also has the function of a flywheel and stores inertia potential energy, so that the air compressor is more stable in operation, the shaft disc 7 is provided with a counterweight hole 29 for counterweight, and the combined crankshaft is adjusted to the optimal balance state by increasing and decreasing materials in the counterweight holes 29 at different positions.

The end of the high-pressure shaft neck 5 is provided with a balance block 19 sleeved on the high-pressure shaft neck 5, a second threaded hole 20 is formed in the high-pressure shaft neck 5, the balance block 19 is screwed in the second threaded hole 20 through a second bolt 21 and is connected with the high-pressure shaft neck 5, the end of the high-pressure shaft neck 5 is provided with a circular mounting seat 22 matched with the balance block 19, the diameter of a cylinder of the circular mounting seat 22 is smaller than that of the cylinder of the high-pressure shaft neck 5, the second bolt 21 is sleeved with a flat washer 23, the flat washer 23 is arranged between a second bolt head 60 of the second bolt 21 and the circular mounting seat 22, and the balance block 19 is fixed between the end of. The balance weight 19 is arranged at the end part of the high-pressure shaft neck 5 to balance the gravity center of the technology, and the balance weight 19 is arranged at the end part of the high-pressure shaft neck 5 through the round mounting seat 22, so that the connection structure is simplified, and the connection stability is ensured.

Example 2

As shown in fig. 1 to 10, in embodiment 1, on the outer wall of the low-voltage journal 4, a shaft disc mounting seat 13 and a first deep groove ball bearing seat 14 are provided, the shaft disc mounting seat 13 is provided on the left side of the first deep groove ball bearing seat 14, a first step surface 15 is provided between the shaft disc mounting seat 13 and the first deep groove ball bearing seat 14, a mounting hole 16 is provided at the right end of the shaft disc 7, the shaft disc mounting seat 13 is provided in the mounting hole 16 and abuts against the shaft disc 7, and the right end of the shaft disc 7 abuts against the first step surface 15; a second deep groove ball bearing seat 17 is arranged on the high-pressure shaft neck 5, and a second step surface 18 is arranged on the left side of the second deep groove ball bearing seat 17. The shaft disc mounting seat 13 of the low-pressure shaft neck 4 is arranged in the mounting hole 16 and the shaft disc 7, the first deep groove ball bearing seat 14 is used for mounting the first deep groove ball bearing 44, the first deep groove ball bearing 44 is fixed on the low-pressure shaft neck 4 through the first step surface 15, and the second step surface 18 is used for fixing the position of the second deep groove ball bearing 49, so that the stability of parts is improved, the internal structure is more compact, and the mounting space is reduced.

Example 3

As shown in fig. 1 to 10, in embodiment 2, the balance weight 19 includes a connecting portion 24 and a fan-shaped balance portion 25, an upper end portion of the connecting portion 24 is connected to a middle portion of a lower end of the fan-shaped balance portion 25 and is integrated with the connecting portion 24, the connecting portion 24 is provided with a through hole 26 adapted to the circular mounting seat 22, an upper end of the through hole 26 is provided with an upper groove 27 recessed upward, an upper end of the circular mounting seat 22 is provided with a lower groove 28 recessed downward, and the upper groove 27 and the lower groove 28 cooperate to form a key groove hole. The fan-shaped balance part 25 is connected with the high-pressure shaft neck 5 through the connecting part 24, the gravity center of the technology during operation is balanced through the fan-shaped balance part 25, the positions of the balance block 19 and the high-pressure shaft neck 5 are fixed by the positioning keys arranged in the key groove 29, the balance block 19 and the high-pressure shaft neck 5 are prevented from rotating relatively, the stability of the balance block 19 during operation is improved, and the three parts of the shaft disc 7, the crankshaft main body 1 and the balance block 19 jointly form a combined crankshaft which can effectively eliminate the rotating inertia moment after optimized design, so that the optimal balance effect is achieved.

The utility model provides an oil-free piston air compressor's drive mechanism, including above the combination formula bent axle, still include crankcase 30, bent axle main part 1 is established in crankcase 30, the right side of reel 7 is equipped with second roller bearing frame 31, the cylinder diameter of second roller bearing frame 31 is less than the cylinder diameter of reel 7, the cover is equipped with left roller bearing 32 on the second roller bearing frame 31, be equipped with the mounting groove 33 with left roller bearing 32 adaptation in the crankcase 30, left roller bearing 32's right side is equipped with the first supporting sleeve 34 that offsets with left roller bearing 32 right side, first supporting sleeve 34 offsets with left roller bearing 32's right side, the cover is equipped with the first gland 35 that offsets with left roller bearing 32 left side on the reel 7. The left roller bearing 32 is fixed by the first support sleeve 34 and the first gland 35, and the axial movement of the left roller bearing 32 is prevented and the loss of bearing grease is prevented.

A first sealing groove 36 is formed in the inner wall of the first gland 35, a first sealing ring 37 matched with the first sealing groove 36 is arranged in the first sealing groove 36, and the shaft disc 7 is sleeved with the first sealing ring 37; a second sealing groove 38 is formed in the outer wall of the first supporting sleeve 34, a second sealing ring 39 matched with the second sealing groove 38 is arranged in the second sealing groove 38, and the second sealing ring 39 is arranged between the first supporting sleeve 34 and the crankcase 30. The two sides of the left roller bearing 32 are sealed by the first sealing ring 37 and the second sealing ring 39, so that the contaminants are prevented from entering the left roller bearing 32 to pollute the lubricating grease, and the lubricating grease in the left roller bearing 32 is further prevented from running off.

The low-pressure journal bearing device further comprises a cylinder body 40 connected with the crankcase 30, a low-pressure piston assembly 41 and a high-pressure piston assembly 42 are arranged in the cylinder body 40, a low-pressure connecting rod 43 connected with the low-pressure piston assembly 41 is sleeved on the low-pressure journal 4, a first deep groove ball bearing 44 sleeved on the low-pressure journal 4 is arranged in the low-pressure connecting rod 43, the first deep groove ball bearing 44 is arranged on the first deep groove ball bearing seat 14, a first cover plate 45 sleeved on the low-pressure journal 4 is arranged on the left side of the low-pressure journal 4, the right side of the first cover plate 45 abuts against the low-pressure connecting rod 43, the left side of the first cover plate 45 abuts against the right end of the shaft disc 7, the first cover plate 45 is fixedly connected with the low-pressure connecting rod 43 through a first screw 46, and first; the high-pressure journal 5 is sleeved with a high-pressure connecting rod 48 connected with the high-pressure piston assembly 42, a second deep groove ball bearing 49 sleeved on the high-pressure connecting rod 48 is arranged in the high-pressure connecting rod 48, the second deep groove ball bearing 49 is arranged on a second deep groove ball bearing seat 17, the left side of the second deep groove ball bearing 49 abuts against the second step surface 18, a second cover plate 50 sleeved on the high-pressure journal 5 is arranged on the right side of the high-pressure connecting rod 48, the second cover plate 50 abuts against the right side of the high-pressure connecting rod 48, the second cover plate 50 is fixedly connected with the high-pressure connecting rod 48 through a second screw 51, and second adjusting collars 52 sleeved on the high-pressure journal 5 are arranged on two sides of the second. The first deep groove ball bearing 44 is pressed in the low-pressure connecting rod 43 through the first cover plate 45, the second deep groove ball bearing 49 is pressed in the high-pressure connecting rod 48 through the second cover plate 50, the low-pressure connecting rod 43 and the high-pressure connecting rod 48 are both of an integral structure, the bearing holes of the low-pressure connecting rod 43 and the high-pressure connecting rod 48 are both stepped, the first deep groove ball bearing 44 and the second deep groove ball bearing 49 can be effectively prevented from loosening, the roundness of the first deep groove ball bearing 44 and the second deep groove ball bearing 49 is ensured to the maximum extent, the radial deformation of the first deep groove ball bearing and the second deep groove ball bearing is prevented, the first adjusting ring sleeve 47 and the second adjusting ring sleeve 52 are respectively used for adjusting the axial positions of the first deep groove ball bearing 44 and the second deep groove ball bearing 49, the low-pressure connecting rod 43 and the high-pressure connecting rod 48 can move up and down on the central axis of the piston hole of the cylinder body all the time, the first cover plate 45, the second cover plate, prevent bearing grease leakage and external dust entering.

The right roller bearing 53 is sleeved on the first roller bearing seat 6, a second support sleeve 54 sleeved on the first roller bearing seat 6 is arranged on the left side of the right roller bearing 53, a third seal groove 55 is formed in the outer wall of the second support sleeve 54, a third seal ring 56 adaptive to the third seal groove 55 is arranged in the third seal groove 55, the third seal ring 56 is arranged between the second support sleeve 54 and the crankcase 30, a second gland 57 is arranged on the right side of the right roller bearing 53, a fourth seal groove 58 is formed in the inner wall of the second gland 57, a fourth seal ring 59 adaptive to the fourth seal groove 58 is arranged in the fourth seal groove 58, and the fourth seal ring 59 is arranged between the second gland 57 and the crankshaft disk 2. The right roller bearing 53 is axially fixed by the second support sleeve 54 and the second gland 57, so that the right roller bearing 53 is prevented from axially moving, the third sealing ring 56 and the fourth sealing ring 59 seal two sides of the right roller bearing 53, so that pollutants are prevented from entering the right roller bearing 53, and meanwhile, the lubricating grease in the right roller bearing 53 is further prevented from losing.

In short, the above description is only a preferred embodiment of the present invention, and all the equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the scope of the present invention.

Claims (9)

1. Modular bent axle, including bent axle main part (1), its characterized in that: the crankshaft main body (1) comprises a crankshaft disk (2) and a journal (3) connected with the crankshaft disk (2), the journal (3) comprises a low-pressure journal (4) connected with a low-pressure piston assembly (41) and a high-pressure journal (5) connected with a high-pressure piston assembly (42), the low-pressure journal (4) and the high-pressure journal (5) are respectively arranged on two sides of the crankshaft disk (2), the low-pressure journal (4) and the high-pressure journal (5) are respectively eccentrically arranged on two sides of the crankshaft disk (2), and the low-pressure journal (4) and the high-pressure journal (5) are arranged in parallel.

2. The modular crankshaft of claim 1, wherein: the end of low pressure axle journal (4) is equipped with reel (7) of being connected with low pressure axle journal (4), reel (7) cover is established on low pressure axle journal (4), be equipped with first screw hole (8) in low pressure axle journal (4), reel (7) are connected with low pressure axle journal (4) in first screw hole (8) through first bolt (9) soon, be equipped with in reel (7) with bolt hole (11) of first bolt head (10) adaptation of first bolt (9), be equipped with in bolt hole (11) and be used for preventing not hard up lock washer (12) of first bolt (9), lock washer (12) cover is established on first bolt (9), lock washer (12) compress tightly in bolt hole (11) through first bolt head (10).

3. The modular crankshaft of claim 2, wherein: a shaft disc mounting seat (13) and a first deep groove ball bearing seat (14) are arranged on the outer wall of the low-pressure shaft neck (4), the shaft disc mounting seat (13) is arranged on the left side of the first deep groove ball bearing seat (14), a first step surface (15) is arranged between the shaft disc mounting seat (13) and the first deep groove ball bearing seat (14), a mounting hole (16) is formed in the right end of the shaft disc (7), the shaft disc mounting seat (13) is arranged in the mounting hole (16) and abuts against the shaft disc (7), and the right end of the shaft disc (7) abuts against the first step surface (15); a second deep groove ball bearing seat (17) is arranged on the high-pressure shaft neck (5), and a second step surface (18) is arranged on the left side of the second deep groove ball bearing seat (17).

4. The modular crankshaft of claim 1, wherein: the tip of high pressure axle journal (5) is equipped with cover and establishes balancing piece (19) on high pressure axle journal (5), the inside of high pressure axle journal (5) is equipped with second screw hole (20), balancing piece (19) are connected with high pressure axle journal (5) in second screw hole (20) through second bolt (21) soon, the tip of high pressure axle journal (5) is equipped with circular mount pad (22) with balancing piece (19) adaptation, the cylinder diameter of circular mount pad (22) is less than the cylinder diameter of high pressure axle journal (5), the cover is equipped with plain washer (23) on second bolt (21), plain washer (23) are established between second bolt head (60) and circular mount pad (22) of second bolt (21), balancing piece (19) are fixed between the tip of high pressure axle journal (5) and plain washer (23).

5. The modular crankshaft of claim 4, wherein: balance weight (19) include connecting portion (24) and fan-shaped balancing portion (25), the upper end of connecting portion (24) is connected and with connecting portion (24) formula structure as an organic whole with the middle part of fan-shaped balancing portion (25) lower extreme, set up through-hole (26) with circular mount pad (22) adaptation on connecting portion (24), upwards sunken upper groove (27) have been seted up to the upper end of through-hole (26), downwards sunken lower groove (28) have been seted up to the upper end of circular mount pad (22), upper groove (27) and lower groove (28) cooperation form the key slot hole.

6. The utility model provides an oil-free piston air compressor's drive mechanism which characterized in that: the combined crankshaft comprises any one of claims 1 to 5, and further comprises a crankcase (30), wherein the crankshaft main body (1) is arranged in the crankcase (30), a second roller bearing seat (31) is arranged on the right side of the shaft disc (7), the diameter of a cylinder of the second roller bearing seat (31) is smaller than that of the cylinder of the shaft disc (7), a left roller bearing (32) is sleeved on the second roller bearing seat (31), an installation groove (33) matched with the left roller bearing (32) is formed in the crankcase (30), a first supporting sleeve (34) abutting against the right side of the left roller bearing (32) is arranged on the right side of the left roller bearing (32), the first supporting sleeve (34) abuts against the right side of the left roller bearing (32), and a first gland (35) abutting against the left side of the left roller bearing (32) is sleeved on the shaft disc (7).

7. The transmission mechanism of an oil-free piston type air compressor as claimed in claim 6, wherein: a first sealing groove (36) is formed in the inner wall of the first gland (35), a first sealing ring (37) matched with the first sealing groove (36) is arranged in the first sealing groove (36), and the shaft disc (7) is sleeved with the first sealing ring (37); a second sealing groove (38) is formed in the outer wall of the first supporting sleeve (34), a second sealing ring (39) matched with the second sealing groove (38) is arranged in the second sealing groove (38), and the second sealing ring (39) is arranged between the first supporting sleeve (34) and the crankcase (30).

8. The transmission mechanism of an oil-free piston type air compressor as claimed in claim 6, wherein: the cylinder body (40) is connected with the crankcase (30), a low-pressure piston assembly (41) and a high-pressure piston assembly (42) are arranged in the cylinder body (40), a low-pressure connecting rod (43) connected with the low-pressure piston assembly (41) is sleeved on the low-pressure journal (4), a first deep groove ball bearing (44) sleeved on the low-pressure journal (4) is arranged in the low-pressure connecting rod (43), the first deep groove ball bearing (44) is arranged on the first deep groove ball bearing seat (14), a first cover plate (45) sleeved on the low-pressure journal (4) is arranged on the left side of the low-pressure journal (4), the right side of the first cover plate (45) is abutted against the low-pressure connecting rod (43), the left side of the first cover plate (45) is abutted against the right end of the shaft disc (7), the first cover plate (45) is fixedly connected with the low-pressure connecting rod (43) through a first screw (46), and first adjusting sleeves (47) are arranged on two sides of the first deep groove; a high-pressure connecting rod (48) connected with a high-pressure piston assembly (42) is sleeved on a high-pressure journal (5), a second deep groove ball bearing (49) sleeved on the high-pressure connecting rod (48) is arranged in the high-pressure connecting rod (48), the second deep groove ball bearing (49) is arranged on a second deep groove ball bearing seat (17), the left side of the second deep groove ball bearing (49) is abutted to a second step surface (18), a second cover plate (50) sleeved on the high-pressure journal (5) is arranged on the right side of the high-pressure connecting rod (48), the second cover plate (50) is abutted to the right side of the high-pressure connecting rod (48), the second cover plate (50) is fixedly connected with the high-pressure connecting rod (48) through a second screw (51), and second adjusting collars (52) sleeved on the high-pressure journal (5) are arranged on two sides of the second deep groove ball.

9. The transmission mechanism of an oil-free piston type air compressor as claimed in claim 6, wherein: the right roller bearing (53) is sleeved on the first roller bearing seat (6), a second supporting sleeve (54) sleeved on the first roller bearing seat (6) is arranged on the left side of the right roller bearing (53), a third sealing groove (55) is formed in the outer wall of the second supporting sleeve (54), a third sealing ring (56) matched with the third sealing groove (55) is arranged in the third sealing groove (55), the third sealing ring (56) is arranged between the second supporting sleeve (54) and the crankcase (30), a second pressing cover (57) is arranged on the right side of the right roller bearing (53), a fourth sealing groove (58) is formed in the inner wall of the second pressing cover (57), a fourth sealing ring (59) matched with the fourth sealing groove (58) is arranged in the fourth sealing groove (58), and the fourth sealing ring (59) is arranged between the second pressing cover (57) and the crankshaft disc (2).

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