Twin shaft harmonic wave formula gear pump
The present invention relates to the gear pump technical field, particularly relate to a kind of twin shaft harmonic wave formula gear pump.
Gear pump is a kind of oil hydraulic pump most widely used in the hydraulic system, structurally nothing more than two kinds of outer gearing and interior engagements, they all are made up of driving gear, driven gear, transmission shaft, the pump housing, pump cover etc., have only an oil sucting cavity, a pumping cavity during work, driving gear rotates and only finishes an oil suction, an oil extraction week.
In the gear pump working procedure, the pressure that fluid acts on outer gear rim is inhomogeneous, and from the oil sucting cavity to the pumping cavity, pressure increases progressively by tooth along the direction of gear rotation, and therefore, it is unbalanced that the suffered radial pressure of transmission shaft and gear is made a concerted effort.This unbalanced radial force is always pushed gear to oil sucting cavity one side, transmission shaft is occured bending and deformation, this has not only strengthened the radial clearance between the pumping cavity gear teeth and the housing, making to leak increases, the volumetric efficiency of pump descends, and can make the gear of oil sucting cavity and the pump housing that scraping or stuck takes place, influence the proper functioning of pump.The working pressure of pump is more high, and radial force is also more big, consequently aggravates the wearing and tearing of bearing, reduces bearing working life, causes pump to scrap in advance.
For a long time, gear pump is in the situation that pressure rating is not high, functional reliability is poor, working life is short, has restricted further raising and the application area thereof of gear pump performance, and primary component bears the crux that bigger radial force is problem in the pump.In order to reduce the influence of radial force, the researcher taked to dwindle the oil drain out diameter, offered relief groove at end cap or the bearing race of pump, reduced the gear width, increased module, reduce the number of teeth, engaging force and hydraulic coupling are separated, adopted the measures such as bearing capacity of sliding bearing or flexible support, reinforcement transmission shaft and bearing, though obtained certain effect, all failed to tackle the problem at its root.
Summary of the invention
The objective of the invention is to solve the existing ubiquitous radial force problem of gear pump, the twin shaft harmonic wave formula gear pump that a kind of balanced radial force, pump oil efficient is provided and all is improved working life.
Technical solution problem of the present invention has adopted the scheme that the gear pump basic principle is combined with Harmonic Gears.Twin shaft harmonic wave formula gear pump of the present invention, comprise transmission shaft, axle, flexbile gear, just wheel, left side plate, sealing block, just take turns pivoted arm, pin, bearing support, roller, support arm, hubcap, the pump housing, pump cover, it is characterized in that: driving sleeve is contained in the left end of axle, and can rotate around axle; Flexbile gear is installed on the outer ring of roller for producing the thin-walled external gear of resiliently deformable; Just wheel is rigid internal gear, and it is provided with the ear seat; Flexbile gear and wheel engagement just, both are concentric and the facewidth equal.
At described transmission shaft firm wheel pivoted arm is installed, its two ends are provided with pin, and pin inserts ear seat Kong Zhongke and drives wheel rotation just; In described axle support arm, left side plate, oil pipe are installed, axle is screwed on pump cover by hubcap.
Described roller and support arm are formed the wave-generator parts, and its length overall is greater than the diameter of bore of above-mentioned flexbile gear, and the support arm two ends are equipped with the roller that is made of rolling bearing.
Described sealing block is at the tooth top of above-mentioned flexbile gear and just between the arc surface of the tooth top of wheel, and is fixed on the described right sideboard with stop pin.
Described left and right side plate is arranged on above-mentioned flexbile gear and the both sides of just having taken turns.
Described flexbile gear, firm wheel and sealing block, left side plate form the oil sucting cavity of two symmetries, the pumping cavity of two symmetries.
Be symmetrically arranged with two axial oil-sucking holes at described left sideboard, respectively corresponding above-mentioned oil sucting cavity; Be symmetrically arranged with two axial oil drainage holes at described right sideboard, respectively corresponding above-mentioned pumping cavity.
Be screwed pressing plate at described left sideboard, pressing plate is provided with two oil inlet holes corresponding with above-mentioned oil-sucking hole, and two oil inlet holes are communicated with oil pipe, and the total oil inlet hole that arranges on this oil pipe and the described axle is communicated with; Described pump cover is provided with two oil outlets corresponding with above-mentioned oil drainage hole, a total oil outlet, and two oil outlets are interconnected.
The invention has the beneficial effects as follows: twin shaft harmonic wave formula gear pump has two oil sucting cavities, two pumping cavities, and they are symmetric arrangement respectively, therefore the radial force that acts on transmission shaft and the bearing thereof of pressure oil is balance, thereby has improved the stressing conditions of transmission shaft, has also reduced leakage; When delivery side of pump pressure raise, the radial hydraulic pressure on the transmission shaft still was balance, and the life-span of bearing and pump is improved; Two pumping cavity while pressure oil output, pump oil efficient height, the pulsation of resultant flow reduces; Because tooth is that face contacts with the engagement of tooth, add that total number of teeth in engagement is more simultaneously, so unit area load is little, operate steadily.Obviously, the present invention has solved the radial force imbalance problem that present gear pump exists effectively, and its combination property is better than existing gear pump, has a extensive future.
Description of drawings
Fig. 1 is structural representation of the present invention;
Fig. 2 is the A-A sectional view of Fig. 1.
1. transmission shafts among the figure, 2. axle, 3. flexbile gear is 4. just taken turns, 5. left sideboard, 6. right sideboard, 7. pressing plate, 8. screw, 9. oil pipe has 10. just been taken turns pivoted arm, 11. pins, 12. stop pin, 13. sealing block, 14. pump housings, 15. rollers, 16. support arms, 17. bearing support, 18. bearing (ball) covers, 19. pump covers, 20. hubcaps, 21. screw, 22. ear seats, 23. locating studs, 24. bolts
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
Fig. 1 and Fig. 2 are embodiments disclosed by the invention.Twin shaft harmonic wave formula gear pump of the present invention by transmission shaft 1, axle 2, flexbile gear 3, just take turns 4, left sideboard 5, right sideboard 6, sealing block 13, just take turns pivoted arm 10, pin 11, bearing support 17, roller 15, support arm 16, hubcap 20, the pump housing 14, pump cover 19 etc. and form.Transmission shaft 1 is sleeved on the left end of axle 2, and can rotate around axle 2; Flexbile gear 3 is installed on the outer ring of roller 15 for producing the thin-walled external gear of resiliently deformable; Just wheel 4 is rigid internal gear, and it is provided with ear seat 22; Flexbile gear 3 and wheel 4 engagements just, both are concentric and the facewidth equal.
At above-mentioned transmission shaft 1 firm wheel pivoted arm 10 is installed, its two ends are provided with pin 11, and pin 11 inserts can drive firm wheel 4 rotations in ear seat 22 holes; In above-mentioned axle 2 support arm 16, left sideboard 5, right sideboard 6, oil pipe 9 are installed, axle 2 is fixed on the pump cover 19 by hubcap 20 usefulness screws 21.
Roller 15 and support arm 16 are formed the wave-generator parts, and its length overall is greater than the diameter of bore of above-mentioned flexbile gear 3, and support arm 16 two ends are equipped with the roller 15 that is made of rolling bearing.
Sealing block 13 is at the tooth top of above-mentioned flexbile gear 3 and just between the arc surface of the tooth top of wheel 4, and is fixed on the right sideboard 6 with stop pin 12.
Left sideboard 5, right sideboard 6 are arranged on flexbile gear 3 and the both sides of just taking turns 4.
Flexbile gear 3, just take turns 4 and form oil sucting cavity a, the pumping cavity b of two symmetries of two symmetries with sealing block 13, left sideboard 5, right sideboard 6.
Be symmetrically arranged with two axial oil-sucking hole c at above-mentioned left sideboard 5, respectively corresponding above-mentioned oil sucting cavity a; Be symmetrically arranged with two axial oil drainage hole d at above-mentioned right sideboard 6, respectively corresponding above-mentioned pumping cavity b.
At above-mentioned left sideboard 5 usefulness screws 8 pressing plate 7 is arranged fixedly, pressing plate 7 is provided with two the oil inlet hole es corresponding with above-mentioned oil-sucking hole c, and two oil inlet hole e are communicated with oil pipes 9, and total oil inlet hole j of setting is communicated with on this oil pipe 9 and the above-mentioned axle 2; Pump cover 19 is provided with two the oil outlet fs corresponding with above-mentioned oil drainage hole d, a total oil outlet k, and two oil outlet f are interconnected.
The pump housing 14, bearing support 17 and pump cover 19 are located by locating stud 23, and tighten up with bolt 24.
The wave-generator of twin shaft harmonic wave formula gear pump of the present invention is to make flexbile gear produce the controlled elasticity deformable members, it is made up of roller 15 and support arm 16, the support arm 16 of wave-generator is a rod-like members that is fixed on the axle 2, the roller 15 that is made of rolling bearing is equipped with at its two ends, and roller 15 compresses mutually with the inwall of flexbile gear 3.Flexbile gear 3 is for producing the thin-walled external gear of big resiliently deformable, and its diameter of bore is less than the length overall of wave-generator parts.After wave-generator is packed flexbile gear 3 into, one pair roller 15 of wave-generator is with flexbile gear 3 support ovalisation, force the standard pitch circle of flexbile gear 3 to become ellipse, near the tooth its major axis two ends meshes fully with the tooth of just taking turns 4, and near the tooth the minor axis two ends is then thrown off fully with firm wheel 4.Because the support arm 16 of wave-generator maintains static, just taken turns 4 during for driving wheel, flexbile gear 3 is follower.When transmission shaft 1 rotates continuously by the firm wheel 4 of wheel pivoted arm 10 drivings just, driving flexbile gear 3 rotates in the same way, it is out of shape constantly and changes, and the outer gear teeth on the above-mentioned deformable flexbile gear 3 are also constantly changed with the engagement of just taking turns the interior gear teeth on 4, realizes nibbling out the suction oil process of oil suction, engaging-in oil extraction.
In the present embodiment, the oily mode of joining of twin shaft harmonic wave formula gear pump of the present invention is: the total oil inlet hole j of low pressure oil on the axle 2, two oil inlet hole e that oil pipe 9 flows on the pressing plates 7 enter into the oil sucting cavity a of two symmetric arrangement again through two oil-sucking hole c on the left sideboard 5; High pressure oil, is discharged by total oil outlet k through two oil drainage hole d, two oil outlet f that are interconnected on the pump cover 19 on the right sideboard 6 from the pumping cavity b of two symmetric arrangement.Support arm 16, left sideboard 5, right sideboard 6 and oil pipe 9 are fixed on the axle 2, and axle 2 is fixed on the pump cover 19, when transmission shaft 1 rotates, just taken turns pivoted arm 10 and just wheel 4, flexbile gear 3 rotate in the same way, guarantee carrying out smoothly of oil suction, oil extraction process.
The working procedure of twin shaft harmonic wave formula gear pump of the present invention is: when transmission shaft 1 drives wheel 4 (direction of arrow shown in Figure 2) rotation along clockwise direction just by firm pin 11 of taking turns pivoted arm 10 two ends, drive flexbile gear 3 in roller 15 rotations, flexbile gear 3 enters the interior engagement of rotating in the same way with firm wheel 4.Near the long axis direction of oval flexbile gear 3, flexbile gear 3 throws off the engagement place gradually with the just gear teeth of wheel 4, the gear teeth of gear withdraw between cog, the between cog sealed volume is increased, form parital vacuum, fluid in the fuel tank from two oil inlet hole e that the total oil inlet hole j on the axle 2 flows on the pressing plate 7 through oil pipe 9, enters into the oil sucting cavity a of two symmetric arrangement by outside fuel sucking pipe again through two oil-sucking hole c on the left sideboard 5 under the external atmospheric pressure effect, inter-tooth slots is full of, finishes oil-absorbing process; Along with firm wheel 4 continues rotation, the fluid that sucks between cog is brought to the pumping cavity b of two symmetric arrangement, at this moment the gear teeth enter engagement, sealed volume is reduced gradually, fluid in the inter-tooth slots is extruded, by two oil drainage hole d on the right sideboard 6, oil outlet f and total oil outlet k on the pump cover 19, will have certain pressure can fluid export outside actuator to by pipeline.The teeth directional Line of contact separated oil sucting cavity and pumping cavity when flexbile gear 3 meshed with firm wheel 4, worked the oil effect of joining.When transmission shaft 1 was constantly rotated by motor drives, the gear teeth were thrown off a side of engagement, because sealed volume becomes greatly then constantly oil suction from fuel tank, the gear teeth enter a side of engagement, because sealed volume reduces then oil extraction constantly, working principle of the present invention that Here it is.
Two oil sucting cavity a of twin shaft harmonic wave formula gear pump of the present invention, two pumping cavity b form the seal operation space of four independences, symmetry.Because symmetrical configuration and two pumping cavities also are symmetric arrangement, therefore the radial hydraulic pressure that acts on the transmission shaft is cancelled out each other, thereby reduced the load on the bearing, fundamentally solved the ubiquitous radial force imbalance problem of existing gear pump, reduce leakage loss, prolonged the life-span of gear pump.Transmission shaft 1 whenever circles, and finishes twice oil suction and presses oily process, and two pumping cavities can produce double output discharge capacity, has improved pump oil efficient.