CN108953554A - A kind of Novikov gears with double circular arc tooth profiles - Google Patents
A kind of Novikov gears with double circular arc tooth profiles Download PDFInfo
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- CN108953554A CN108953554A CN201810893876.1A CN201810893876A CN108953554A CN 108953554 A CN108953554 A CN 108953554A CN 201810893876 A CN201810893876 A CN 201810893876A CN 108953554 A CN108953554 A CN 108953554A
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- Prior art keywords
- arc
- straightway
- gear
- tooth
- circular arc
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/02—Toothed members; Worms
- F16H55/17—Toothed wheels
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/02—Toothed members; Worms
- F16H55/06—Use of materials; Use of treatments of toothed members or worms to affect their intrinsic material properties
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/02—Toothed members; Worms
- F16H55/08—Profiling
- F16H55/0826—Novikov-Wildhaber profile
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Thermal Sciences (AREA)
- Gears, Cams (AREA)
Abstract
The invention discloses a kind of Novikov gears with double circular arc tooth profiles, including the gear teeth being sequentially distributed on gear, the basic rack tooth profile of each gear teeth includes the dome arc of tooth top and the concave arc of tooth root, the dome arc is connect by straightway with concave arc, the straightway intersects with dome arc, concave arc, the intersection point of the straightway and dome arc to pitch circle D distance H1Less than straightway and concave arc intersection point to pitch circle D distance H2；Design by the flank profil of the transformed into processing of straightway as involute, since the participation of involute is engaged, bearing capacity, transmission efficiency, transmission stability and the service life of gear are thus improved, this fit on electrospark running-in avoids spot corrosion of the involute profile therein in runing condensation procedure.
Description
Technical field
The present invention relates to gear technique field, especially a kind of Novikov gears with double circular arc tooth profiles.
Background technique
Wildhaber-novikov gear is point gearing helical gear, and the continuity of transmission is guaranteed by its axial overlap coefficient >=1.They
Basic rack tooth profile is, using concave arc as tooth root, straight line or concave arc to be used between addendum circle arc and tooth root circular arc using dome arc as tooth top
It is connected.After this gear is come out by rolling cut, flank profil corresponding to straight line connecting line is involute profile；Using concave arc as connecting line
, corresponding is that flank profil has a pit.In order to process this pit, there is a Roound edge outstanding on hobboing cutter.Afterwards
The Typical Representative of person is the double circles of stepwise of standard GB/T 12795-1991 " double arc cylinder gear basic rack tooth profile " defined
The bearing capacity of gear with curved teeth (such as Fig. 1), segment double circular arc gear improves 40% than involute gear.The practical proof of many years point
Stepwise Novikov gears with double circular arc tooth profiles has following deficiency: 1) pit not only skiving transverse tooth thickness results in the generation of recess broken teeth accident, and
Have lost the involute profile that can undertake load about 10% originally.2) transmission efficiency is reduced, from the angle of elastic dynamic pressure oil film
Study stepwise flank profil, shown in oil film pressure curve such as Fig. 2 (a), there are four leakage point, oil films altogether for the oil films of two dispersions
The area of pressure curve is small.Novikov gears with double circular arc tooth profiles comprising involute gear is formed by shown in oil film such as Fig. 2 (b), and oil film only has
The area of two leakage points, oil film pressure curve is much larger than Fig. 2 (a).The pressure curve area of oil film is big, illustrates oil film pressure
Greatly, it is meant that oil film between the flank of tooth is thick, friction is small, transmission efficiency is high, the service life is long, high reliablity；3) transmission stability is reduced,
Since the part cut out is substantially involute helical gear, its existing end face overlap coefficient also has axial overlap coefficient.It joins
With engage the overlap coefficient and transmission stability that will increase Novikov gears with double circular arc tooth profiles, and reduce noise.Used stepwise bicircular arcs
Gear has comprehensively considered the factors such as bending strength, contact strength and cutter life, by it is various test and actual use
Test, it was demonstrated that be an outstanding design.Experience and foundation are provided to improve Novikov gears with double circular arc tooth profiles.
Running-in is the essential process flow of Novikov gears with double circular arc tooth profiles.But the Novikov gears with double circular arc tooth profiles of involute profile is had,
Involute profile part is easy to appear spot corrosion in runing condensation procedure.
The reason of generating spot corrosion is that double circular arc tooth outline is the main body of bearing load, its bearing capacity is in runing condensation procedure
In gradually form.At the initial stage of running-in, when the bearing capacity of circle-arc tooth is not yet formed, the major part of load has fallen on involute
It has been more than the bearing capacity of involute profile, so as to cause its spot corrosion in flank profil.
In response to this, it in order to avoid its involute profile generates spot corrosion in runing condensation procedure, enables and processes the flank profil
The rectilinear edge of hobboing cutter translates (protrusion) (such as Fig. 3) outward, the involute profile indent for the Novikov gears with double circular arc tooth profiles processed in this way, runs
Involute profile is because indent is without engaging when conjunction, to achieve the purpose that avoid generating spot corrosion.Hobboing cutter rectilinear edge translates outward
Amount be two running-in of gear total amounts of size half, due to use it is same hobboing cutter process two gears of size, this running-in
Surplus is divided equally, and is uniquely to select.But find that above-mentioned technology has two o'clock insufficient in practice: 1) due to the race of Novikov gears with double circular arc tooth profiles
It closes, the especially running-in of large modulus, Hardened gear face, is a long-time, the high cost process for expending a large amount of power resources；2) in reality
In the runing condensation procedure of border, in the case where surplus is divided equally, pinion gear has often been had broken-in, and gear wheel not yet running-in is good, says
It is unreasonable that bright running-in amount, which is divided equally,.Two above-mentioned deficiencies can be solved with electrospark running-in technology.
Before number picks up year, automobile industry is in order to solve the problems, such as that its involute gear seating time is long, energy consumption is high and uses electricity
Spark running-in.It is with the obvious advantage due to electrospark running-in, it is used soon by the enterprise of the double garden gears with curved teeth of production stepwise.
The principle of electrospark running-in is: will form thin oil film when Meshing Pair operates under small loads, between the flank of tooth.Exist at this time
After applying certain pulse voltage between Meshing Pair, that is, gear error maximum most thin in oil film, oil film can be breakdown and be generated
Electric spark will melt at this.After runing condensation procedure, gear surface hardness HRC2~3 higher than the original quenching flank of tooth；Soft tooth flank gear
Its tooth face hardness can also reach HRC40；The noise of Meshing Pair is also declined.
Reconditioning stepwise bicircular arcs hobboing cutter, can process the Novikov gears with double circular arc tooth profiles with involute profile, which can be improved
10% or so bearing capacity, and transmission efficiency and gear life is enabled to increase.Although involute profile is run in electric spark
Spot corrosion still occurs when spot corrosion does not occur during closing, but facts have proved its work, it is therefore necessary to be directed to Involute gear
Flank profil is improved.
Summary of the invention
For overcome the deficiencies in the prior art, the present invention provides a kind of Novikov gears with double circular arc tooth profiles.
The technical solution adopted by the present invention to solve the technical problems is:
A kind of Novikov gears with double circular arc tooth profiles, including the gear teeth being sequentially distributed on gear, the basic rack tooth profile of each gear teeth includes tooth top
Dome arc and tooth root concave arc, the dome arc connect by straightway with concave arc, the straightway and dome arc, recessed
Circular arc intersection, the intersection point of the straightway and dome arc to pitch circle D distance H1Less than the intersection point of straightway and concave arc
To the distance H of pitch circle D2。
As a preference, the angle α of the straightway and pitch circle D are 60 °~75 °.
As a preference, gear surface passes through electrospark running-in working process.
The beneficial effects of the present invention are: the design by the flank profil of the transformed into processing of straightway as involute, due to gradually
The participation engagement burst at the seams, thus improve bearing capacity, transmission efficiency, transmission stability and the service life of gear, this fit on electrical fire
Running-in is spent to avoid spot corrosion of the involute profile therein in runing condensation procedure.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 is the structural schematic diagram of original technology segment double circular arc gear；
Fig. 2 is original technology oil film pressure curve synoptic diagram；
Fig. 3 is the structural schematic diagram of original technology another kind gear；
Fig. 4 is structural schematic diagram of the invention.
Specific embodiment
It is with reference to the accompanying drawings and embodiments, right in order to which the objects, technical solutions and advantages of the application are more clearly understood
The present invention is further elaborated.For the thorough explanation present invention, some certain details can be related in following description
Section.And in these no specific details, the invention can still be realized, i.e., the technical staff in fields uses herein
These describe and state that the others skilled in the art into fields can more effectively introduce their work essence.
Reference Fig. 4, a kind of Novikov gears with double circular arc tooth profiles, including the gear teeth being sequentially distributed on gear, the basic rack tooth profile of each gear teeth
The concave arc 2 of dome arc 1 and tooth root including tooth top, the dome arc 1 are connect by straightway 3 with concave arc 2, the straight line
Section 3 intersects with dome arc 1, concave arc 2, the intersection point of the straightway 3 and dome arc 1 to pitch circle D distance H1Less than straight
The intersection point of line segment 3 and concave arc 2 is to pitch circle D distance H2.Wherein the flank profil of above-mentioned the transformed into processing of straightway 3 is gradually
It bursts at the seams.Straightway 3 (involute profile) participates in engagement, can increase about 10% bearing capacity, also as involute profile is substantive
On be a helical gear, existing axial overlap coefficient also has end face overlap coefficient, simultaneously participates in engagement and enables the transmission of entire gear
It is more steady.
The angle α of the straightway 3 and pitch circle D is 60 °~75 °.Gear surface is by electrospark running-in processing
Reason improves the flank profil of segment double circular arc gear, and exploitation has the novel high-quality flank profil of involute profile.
When electrospark running-in, anode running-in amount is greater than cathode running-in amount；And the reverse that can be convenient, adjust running-in
Amount, make big pinion gear can satisfactorily running-in, there is no the more than needed of running-in surplus or insufficient.When because of electrospark running-in, gear pair
It does not contact with each other, load is especially small, is not to cause the spot corrosion of the involute profile in the gear with curved teeth of double gardens.
According to above-mentioned principle, the present invention can also be made appropriate changes and modifications to the above embodiments.Therefore, this hair
It is bright to be not limited to specific embodiment disclosed and described above, some modifications and changes of the invention should also be as to fall into this
In the scope of protection of the claims of invention.
The running-in of the flank profil uses electrospark running-in technology.As previously mentioned, during electrospark running-in, two teeth of size
Always across one layer of oil film between wheel, two gears not in contact with, it is of course impossible to generate the pitting problem of its involute profile.With
The running-in technology of tangent type double circular arc tooth outline above-mentioned is compared, and other than the advantage for having energy- and time-economizing, running-in surplus is also not present
Insufficient or superfluous trouble.Because when electrospark running-in, being melted the gear wheel for being to turn on positive pole much.In addition, root
According to actual conditions can more gear changing electric power polarity, with guarantee two gears of size can in preset surplus running-in it is complete
Finish.
It was verified that the advantage of the existing energy- and time-economizing of electrospark running-in technology, and the advantages of avoid spot corrosion, in this technology
The middle flank profil that segment double circular arc gear is improved using electrospark running-in technology is enabled it increase involute profile, and effectively kept away
Exempt from its involute profile and generates pitting problem.
Claims (3)
1. a kind of Novikov gears with double circular arc tooth profiles, including the gear teeth being sequentially distributed on gear, the basic rack tooth profile of each gear teeth includes tooth top
The concave arc (2) of dome arc (1) and tooth root, it is characterised in that: the dome arc (1) is connected by straightway (3) and concave arc (2)
It connects, the straightway (3) is intersected with dome arc (1), concave arc (2), the intersection point of the straightway (3) and dome arc (1) to tooth
Take turns the distance H of pitch circle D1Less than straightway (3) and concave arc (2) intersection point to pitch circle D distance H2。
2. a kind of Novikov gears with double circular arc tooth profiles according to claim 1, it is characterised in that: the straightway (3) is with pitch circle D's
Angle α is 60 °~75 °.
3. a kind of Novikov gears with double circular arc tooth profiles according to claim 1, it is characterised in that: gear surface is processed by electrospark running-in
Processing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810893876.1A CN108953554B (en) | 2018-08-06 | 2018-08-06 | Double-arc gear |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810893876.1A CN108953554B (en) | 2018-08-06 | 2018-08-06 | Double-arc gear |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108953554A true CN108953554A (en) | 2018-12-07 |
| CN108953554B CN108953554B (en) | 2020-06-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810893876.1A Active CN108953554B (en) | 2018-08-06 | 2018-08-06 | Double-arc gear |
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| CN (1) | CN108953554B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112377594A (en) * | 2020-11-10 | 2021-02-19 | 重庆交通大学 | Sectional type point-line meshing gear pair |
| CN112963505A (en) * | 2021-03-25 | 2021-06-15 | 郑州爱丁宝机电科技有限公司 | Double-arc small-tooth-difference speed reduction transmission device and double-arc tooth forming method |
Citations (5)
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|---|---|---|---|---|
| CN1544814A (en) * | 2003-11-24 | 2004-11-10 | 大连铁道学院 | Medium-high pressure gear pump having asymmetric double-circular-arc gear shape |
| CN101338814A (en) * | 2008-08-28 | 2009-01-07 | 段建中 | Tooth profile gear |
| CN102494104A (en) * | 2011-12-06 | 2012-06-13 | 许奉成 | Single-tangent double-circular-arc gear |
| CN107191570A (en) * | 2017-06-07 | 2017-09-22 | 天津工业大学 | The three-arc tooth Profile Design of continuous conjugation cup or carnival hat shape harmonic gear |
| CN209483896U (en) * | 2018-08-06 | 2019-10-11 | 查世樑 | A kind of Novikov gears with double circular arc tooth profiles |
-
2018
- 2018-08-06 CN CN201810893876.1A patent/CN108953554B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1544814A (en) * | 2003-11-24 | 2004-11-10 | 大连铁道学院 | Medium-high pressure gear pump having asymmetric double-circular-arc gear shape |
| CN101338814A (en) * | 2008-08-28 | 2009-01-07 | 段建中 | Tooth profile gear |
| CN102494104A (en) * | 2011-12-06 | 2012-06-13 | 许奉成 | Single-tangent double-circular-arc gear |
| CN107191570A (en) * | 2017-06-07 | 2017-09-22 | 天津工业大学 | The three-arc tooth Profile Design of continuous conjugation cup or carnival hat shape harmonic gear |
| CN209483896U (en) * | 2018-08-06 | 2019-10-11 | 查世樑 | A kind of Novikov gears with double circular arc tooth profiles |
Non-Patent Citations (1)
| Title |
|---|
| 郝婧等: "《机械设计基础》", 30 September 2007, 北京航天航空大学出版社 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112377594A (en) * | 2020-11-10 | 2021-02-19 | 重庆交通大学 | Sectional type point-line meshing gear pair |
| CN112377594B (en) * | 2020-11-10 | 2024-05-10 | 重庆交通大学 | Sectional type dotted line meshing gear pair |
| CN112963505A (en) * | 2021-03-25 | 2021-06-15 | 郑州爱丁宝机电科技有限公司 | Double-arc small-tooth-difference speed reduction transmission device and double-arc tooth forming method |
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| Publication number | Publication date |
|---|---|
| CN108953554B (en) | 2020-06-30 |
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