Cycloidal gear scalenine
The invention relates to mechanical engineering and can be implemented in pump engineering turn out and compressor engineering, in particular in pumps and compressors positive displacement screw type and screw pumps for pumping of multiphase mixtures. The mesh contains siteplease between a toothed rotor with vzaimootmenyaemymi profiles of the teeth. Heads 1 and 2 outlined shortened epicycloidal 5 and 6. The legs 3, 4 are outlined elongated epicycloidal 7, 8. Head and legs are conjugate side plot as a straight line 9, 10, with its transition into a simple epicycloid 11, 12, followed by the shortened epicycloid 5, 6 heads of the tooth 1, which is formed by a point of the pair of elongated epicycloid 8 and a straight line 10 feet 4 another tooth. Simple epicycloid 11 is formed by a straight line 10 from another tooth. The technical result is an improvement of the geometry of the tooth profile for high-performance pumps. 3 C.p. f-crystals, 2 Il.
The invention relates to mechanical engineering and can be implemented in pump engineering turn out and compressor engineering, namely, pumps and compressors positive displacement screw type and screw pumps for pumping of multiphase mixtures. In addition, more pumps with cycloidal gearing. Known cycloidal engagement with a symmetric profile . The side profiles forming gears of the gearing consists of the following elements: the base of the tooth speakers and the top of the tooth of the Holy Curve AC, representing an extended epicycloid formed by the point And rolling the first circle, second circle. The diameters of the circles are equal and equal center-to-center distance. Curve St - epicycloid formed by point B while rolling the first circle, second circle.
These screw pumps have a number of design and technological shortcomings. Most notable is the difficulty of manufacturing the profile of the screws with the convexity and concavity of the profile, while maintaining tight tolerances and high surface finishes. In addition, the bulge affect the operation of the pump, because rolling over the surface of the second tooth, the bulge crushed or chipped off. In consequence of which the slit is formed, and therefore will have a flow rate of the fluid. To eliminate such drawbacks, the teeth of a cycloidal gearing correct. Remove the bump with one wheel, and as the seal is the second wheel, where the path takes into account the remote issue is the fight toothed rotor with vzaimootmenyaemymi profiles of the teeth, with head, outlined trochoidea, and the leg of the tooth formed elongated epicycloidal, defined by the point on the circumference of the vertices of a different profile. The top and foot of the tooth associated side section in the form of evolvent. In the specified engages the head of the tooth is formed shorter point mate evolvent side plot with elongated epicycloidal legs another profile. I.e. have the form UE + EV + UKE (extended epicycloid + involute + shortened epicycloid). These profiles are used in single and dushani screw multiphase pumps.
Manufacturer of screws with a cycloidal gear meshing with profiles UE + EV + ECAS also presents a major challenge. The tooth profile has a ledge, and after dividing the circumference goes into recess. This means that the profile of the teeth of the cutting tool, in this case most likely cutter must have a dramatically changing the form. Cutter this configuration wears out quickly, often to perform the grooves on the workpiece screw apply a set of tools, which leads to inaccuracy in the manufacture of screws. And in the case of a blunting of the cutting tool during the cutting process, the tool must be replaced or sharpened. To do this, it lublinie tooth for dividing the circumference. To retract the cutting tool will not be possible, because he will hook protrusion of the tooth. Therefore, the cutting tool output return stroke of the work done in the gathering of the screw groove over its entire length, while rotating the workpiece.
However, along with the lack of (the complexity of manufacturing a cycloidal gearing) performed korregirovannye, introduction to the profile of the tooth PE in the known technical solution is a positive factor. This correction makes theoretically pump leaking, but practically it is still more efficient than a pump with a cycloidal gear mesh without korregirovaniya profile of the teeth of the screws after a short operation.
Natural wear of the screw, made with the ledge, the more acute will be more harmful, because this will be no compensation profile 2nd tooth that will eventually lead to a large drop in the tightness of the screw. Therefore, correction of theoretical profile of the forming teeth of the screws quite reasonable.
To address these shortcomings the basis of the invention cycloidal gearing tasked by improving (correction) the geometry of the profile of the teeth to create physicalname gearing as well as is known, contains siteplease between a toothed rotor with vzaimootmenyaemymi profiles of the teeth. The teeth have a head, outlined shortened epicycloidal and leg, contoured elongated epicycloidal. They involve a side plot. In contrast to the known cycloidal gearing in the inventive profile correct way, namely:
The side plot is a straight line, passing in a simple epicycloid, which in turn becomes shortened epicycloid head of the tooth formed by the point of a pair of elongated epicycloid and straight line of the leg of another tooth. At the same time simple epicycloid formed by a straight line of the other teeth.
In addition, a straight line can be made radially or at an angle thereto. And the beginning of the straight line is the point on the contour of the leg of a tooth.
According to the claimed technical solution the profile of the tooth would be UE + PL + PE + UKE (extended epicycloid + direct line + simple epicycloid + shortened epicycloid).
Distinctive features of the proposed technical solutions provide a number of positive qualities that affect the technical result:
- side plot is a straight line, a straight line of one tooth, preuzimanje profile of the teeth;
straight line turns into a simple epicycloid head of the tooth, this allows for a smooth transition, the maximum combined with the middle part of the profile legs of the second tooth;
- simple epicycloid becomes shortened epicycloid, this transition provides a smooth transition from one curve to another, in addition, received in completed form the crown of the tooth, which interacts with the root of the leg of another tooth;
- shortened epicycloid head of the tooth formed by the point of a pair of elongated epicycloid and straight line of the leg of another tooth, and a simple epicycloid formed by a straight line of another tooth, this confirms the correctness of the choice of the profile of the teeth of the two working screws, the shape of which vzaimopronikayut profile contours;
- a straight line is radial, this solution provides the classic profile of a tooth of one or the other of the rotor;
- a straight line is at an angle to the radial component, the specified location allows the manufacture of a cycloidal gear with a wider field of tolerances or manufacturing change profile at the site simple epicycloid;
- the beginning of the straight line is the point on the contour of the elongated epicycloid, is OI to the longitudinal axis of the tooth, the cutting tool may be removed directly from the cutting zone without displaying it on the entire length of the cut grooves. This is the best option.
Thus, with the elimination of recess in the stem of the tooth, that is, in coils, simplifies the manufacture of the teeth of the screw and the cutting tool. Profile as the teeth of the screws and the teeth of the cutting tool is without sharp projections and depressions, which simplifies their manufacture. The selected profile of the teeth provides high tightness and at the same time create good conditions lubrication when the screw pumps, compressors, as well as multiphase pumps.
These essential features are causal connection with the foregoing results and help to improve the design of a cycloidal gearing by correcting their profile.
In Fig.1 shows the circuit of a cycloidal gearing UE + PL + PE + UKE.
In Fig.2 - contour of the tooth UE + EV + UKE with correction.
Cycloidal gearing, containing siteplease between a toothed rotor (Fig. not shown) with vzaimootmenyaemymi profiles of the teeth having a head 1, 2 and leg 3, 4, the cylinder 1, 2, outlined shortened epicycloidal 5 and 6 respectively, and the leg 3, 4, outlined ugly ostow epicycloid 11, 12. In turn simple epicycloid 11, 12 becomes shortened epicycloid 5, 6 of the head 1 of the tooth, which is formed by a point of the pair of elongated epicycloid 8 and a straight line 10 feet 4 another tooth. At the same time simple epicycloid 11 is formed by a straight line 10 from another tooth. The same happens with a simple epicycloidal 12, which becomes shortened epicycloid 6 of the head 2 of the tooth. Epicycloid 12 formed by the point of a pair of elongated epicycloid 7 and a straight line 9 leg 3 of the first tooth. At the same time simple epicycloid 12 is formed by a straight line 9 of the first tooth. A straight line 9, 10 can be radially or at an angle thereto.
Cycloidal gearing is as follows. By rotating one rotor simultaneously rotates the second rotor. The head 1 of the tooth, the form of which consists of a shortened epicycloid 5 and simple epicycloid 11, smoothly rolls on the leg 2 of another tooth, which consists of elongated epicycloid 8 and a straight line 10. Resulting in the formation of the head 1 of the tooth. Shortened epicycloid 5 describes the leg of the profile of the second tooth, specifically point of the pair of elongated epicycloid 8 with a straight line 10. In turn, simple epicycloid 11 of the tooth fo 11 point. This means that on both sides of the point created lubricated wedge.
The contour of the head of the second tooth is formed with a shortened epicycloid 6 and simple epicycloid 12. Shortened epicycloid 6 is formed by the point of a pair of elongated epicycloid 7 and a straight line 9 of the first tooth. And simple epicycloid 12 is formed by a straight line 9 of the first wheel.
Thus, the formation of the shape contour of the teeth is mutual. The first leg of the tooth forms a contour of the head of the second tooth and the opposite leg of the second tooth forms the contour of the head of the first tooth. Comparison of the known profile of a cycloidal gear type UE + EV + ECAS and the claimed type UE + PL + PE + ECAS showed that leg of the tooth has become thickened, and the head of the tooth on the amount of thickening of the legs decreased (Fig.2). The production profiles of the teeth is greatly simplified due to the presence of straight lines 9, 10. Torreyana form of teeth provided the pump without flow of the fluid in the opposite direction of the discharge and at the same time created the optimal and guaranteed lubricating wedge, which acts as towards the head of the tooth and in the direction of the leg of a tooth. Mathematical calculations using computer data call is provided by the manufacturer of screws.
In the test result multiphase pump declare cycloidal gearing at rated flow 500 m3/hour, a pressure of 30 kg/cm2and the content in the medium being pumped around 10% of the gas volume factor was 88-90%.
These results are confirmed when testing an experimental batch of pumps in the amount of 3 products. Audit cycloidal gearing operating time after 72 hours on the teeth is not detected chips, scratches, cracks or naklab metal on metal.
Held korregirovannye cycloidal gearing allowed to choose the most appropriate option that solves the problem of production, without compromising technical performance of the multiphase pump.
Sources of information:
1. Screw pumps. Ed. by D. F., Balenko. - 1982, page 153.
2. Copyright certificate № 1772470, IPC F 16 H 1/06 - the prototype.
1. Cycloidal gearing, containing siteplease between a screw vzaimootmenyaemymi profiles of the teeth with the crown outlined shortened epicycloid, leg, contoured elongated epicycloidal, and paired lateral area, wherein the side plot is a straight line, perey pair of elongated epicycloid and straight line of the leg of another tooth, at the same time simple epicycloid formed by a straight line of the other teeth.
2. Cycloidal gearing under item 1, characterized in that a straight line is radial.
3. Cycloidal gearing under item 1, characterized in that a straight line is at an angle to the radial component.
4. Cycloidal gearing according to any one of paragraphs.1-3, characterized in that the beginning of the straight line is the point on the contour of the elongated epicycloid.
FIELD: mechanical engineering.
SUBSTANCE: planet gear has input shaft with eccentric , race, and satellites.
EFFECT: improved design.
2 cl, 8 dwg