CN104675955A - Combined variable tooth thickness gear - Google Patents
Combined variable tooth thickness gear Download PDFInfo
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- CN104675955A CN104675955A CN201510068215.1A CN201510068215A CN104675955A CN 104675955 A CN104675955 A CN 104675955A CN 201510068215 A CN201510068215 A CN 201510068215A CN 104675955 A CN104675955 A CN 104675955A
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Classifications
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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
- F16H55/12—Toothed members; Worms with body or rim assembled out of detachable parts
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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
- F16H55/14—Construction providing resilience or vibration-damping
-
- 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
- F16H2055/176—Ring gears with inner teeth
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Gears, Cams (AREA)
- Retarders (AREA)
Abstract
The invention discloses a combined variable tooth thickness gear. The gear is sequentially constructed by a plurality of annular gear pieces with the same number of teeth and variable-thickness tooth shapes; the gear teeth of each gear piece are arranged in the inner circumference of the annular gear piece; each gear piece comprises outer gear pieces and inner gear pieces positioned between the two outer gear pieces; a vibration and noise reduction sheet is connected between every two externally-adjacent gear pieces in a glued manner; a plurality of mounting holes used for fixing the gear piece are formed in the circular ring of each gear piece; the tip diameter and the root diameter of each gear piece are equal; the tooth thickness of each gear piece gradually increases or decreases along the same axial direction of the gear; the inner and outer gear pieces and the vibration reduction pieces construct a complete variable tooth thickness tangential-deflection inner gear structure. The combined variable tooth thickness gear constructs the variable tooth thickness gear by combining the gear pieces, so that the gear machining usability is good, the glued vibration and noise reduction pieces are arranged among the gear pieces, the meshing vibration is restrained at the root, the transmission noise is reduced, and the service life of a gear pair is prolonged.
Description
Technical field
The present invention relates to gear transmission technology field, particularly relate to a kind of combined variable tooth thickness gear, this gear has complete change transverse tooth thickness tangent modification inner gear structure.
Background technique
Gear-box is as the important transmission part of modern automobile industry, and be one of the main vibration source and noise source in car running process, its service behaviour has important impact to car load.Automobile vendor also pays much attention to and reduces the vibration & noise of gear-box, and using its bright spot as new car.Gears meshing produces vibration, is delivered on gear housing, causes casing to vibrate by axle and bearing support, simultaneously radiated noise.The vibration at gears meshing interface is the decisive excitation of construct noise, how to suppress to engage the vibration produced, and reduces noise from root, has important engineer applied and is worth.
Variable tooth thickness gear, its modification coefficient changes in the axial direction according to certain rules, and profile of tooth forms certain taper at axial direction.Just can regulate meshing backlass by adjusting its axial displacement, reaching and adjusting gap or the gap object that disappears, realizing precision drive, therefore have broad application prospects in the transmissions such as precision machinery people and elaborate servo.But this Gear Processing is more difficult, and do not have by the lathe of its forming principle design available, cost of production is very high, therefore solves its processing problems under existing level of processing at home, significant for the application promoting this kind of gear.On the other hand, the variable tooth thickness gear of prior art all adopts overall structure, and the vibration noise produced by gears meshing is comparatively large, solves the noise problem of variable tooth thickness gear, also significant for the application promoting this gear.
Summary of the invention
The object of the invention is the large problem of variable tooth thickness gear gearing noise for solving the variable tooth thickness gear processing difficulties of prior art and prior art and a kind of easy to process and combined variable tooth thickness gear that meshing noise is low is provided.
The present invention is the technological scheme solving the problems of the technologies described above employing, a kind of combined variable tooth thickness gear, described gear has the identical number of teeth by some and the ring gear piece sequential combination with thickening profile of tooth is formed, the gear teeth of gear piece are arranged on the inner circumference of ring gear piece, described gear piece comprises is located at gear shaft to the outer gear piece at two ends and the some inner blades between two outer gear pieces, the thickness of outer gear piece is greater than the thickness of inner blade, all glued joint between adjacent gear piece and have vibration and noise reducing sheet, the annulus of gear piece is provided with some for fixing gear piece mounting hole, the tip diameter of described gear piece and root diameter are all equal, the transverse tooth thickness of described gear piece is along the same axial increasing or decreasing of gear, inside and outside gear piece and vibration and noise reducing sheet form a complete change transverse tooth thickness tangent modification inner gear structure.Change transverse tooth thickness tangent modification gear of the present invention is made up of the ring gear piece combination that some have thickening profile of tooth, gear piece comprises outer gear piece and inner blade, wherein gear shaft to both ends of the surface on one piece of outer gear piece is respectively set, between outer gear piece, some inner blades are set, vibration and noise reducing sheet is gluedd joint between adjacent gear piece, basic structure and the gear piece of vibration and noise reducing sheet are suitable, inside and outside gear piece and vibration and noise reducing sheet are fixed by the screw in fixed hole or rivet joint, thus the change transverse tooth thickness tangent modification internal gear that formation one is complete.Adopt gear piece combination bonding mode to form and become transverse tooth thickness tangent modification internal gear, because single gear piece thickness is less, therefore easily processing request is reached, Gearmaking Technology is good, apply simple technique and just can complete Hardened gear face and the processing of high-precision variable tooth thickness gear, solve the problem of the variable tooth thickness gear processing difficulties of prior art, bearing capacity and the running precision of transmission device can be improve.Here thickening profile of tooth refers to its transverse tooth thickness of the gear teeth axially progressively being increased towards another side by one of gear piece at gear on gear piece.In addition, all glued joint between the gear piece that the present invention is adjacent and have vibration and noise reducing sheet, vibration and noise reducing sheet has high damping characteristic, gluedd joint between gear piece, the vibration that can effectively suppress gears meshing to cause, namely reduces the mesh vibration of gear from root, reduce rotational noise, thus reduce noise.Therefore structure of the present invention can solve the large problem of the variable tooth thickness gear gearing noise of prior art, also can extend the working life of gear pair simultaneously, be specially adapted to high-precision transmission device.In addition, the present invention passes through the fixing dual fastening means of splicing and screw or rivet, can guarantee the bulk strength of gear.
As preferably, the gear teeth of described gear are straight-tooth or helical teeth, and the modification coefficient of described gear is along gear shaft to linearly changing.
As preferably, the thickness of all inner blades is equal, and the thickness of all vibration and noise reducing sheets is equal and its thickness is 15% to 30% of inner blade thickness, and equal and its thickness of the thickness of outer gear piece is 3 to 5 times of inner blade thickness.For the vibration and noise reducing sheet of identical material, adopt and can improve effect of vibration and noise reduction compared with heavy thickness, but the bulk strength of gear can be affected; And the thickness of vibration and noise reducing sheet is too small, then effect of vibration and noise reduction is poor, usually select the thickness of vibration and noise reducing sheet to be the 15% to 30% proper of inner blade thickness, this numerical value also can consider according to the noise reduction performance of the actual demand of different operating mode gear and unlike material vibration and noise reducing sheet to be chosen.Outer gear piece of the present invention is except the function bearing gear, also bear the function compressing inner blade and vibration and noise reducing sheet, therefore the thickness of outer gear piece is usually larger than the thickness of inner blade, can also guarantee the edge strength of gear like this, avoids being positioned at outermost gear piece cracking or curling.
Gear piece of the present invention and vibration and noise reducing sheet also can adopt several further modified node method form below:
1, the thickness of all inner blades is equal, the thickness being positioned at the vibration and noise reducing sheet of the larger inner blade side of transverse tooth thickness is greater than the thickness of the vibration and noise reducing sheet being positioned at the less inner blade side of transverse tooth thickness, the thickness of vibration and noise reducing sheet is along gear shaft to linearly changing, the minimum thickness of vibration and noise reducing sheet is 15% to 20% of inner blade thickness, the maximum ga(u)ge of vibration and noise reducing sheet is 25% to 30% of inner blade thickness, and equal and its thickness of the thickness of outer gear piece is 3 to 5 times of inner blade thickness.In the technical program, in gear, the thickness of each inner blade is all equal, the thickness of vibration and noise reducing sheet is different, the thickness of the vibration and noise reducing sheet of the inner blade side that close transverse tooth thickness is larger is larger, the thickness of the vibration and noise reducing sheet of the inner blade side that close transverse tooth thickness is less is less, and the thickness of vibration and noise reducing sheet is along gear shaft to linearly changing.This considers that its boundary dimension of inner blade that transverse tooth thickness is larger is relatively large, under same thickness, its resonant frequency is lower, and the larger vibration and noise reducing sheet of thickness has better damping capacity for the vibration that frequency is lower, like this can under the prerequisite not increasing vibration and noise reducing sheet integral thickness the vibration suppression frequency band of broadening gear, reduce the rotational noise of gear, thus reduce noise.
2, the thickness of the inner blade that transverse tooth thickness is less is greater than the thickness of the larger inner blade of transverse tooth thickness, the thickness of maximum ga(u)ge inner blade is 1.5 to 2 times of the thickness of minimum thickness inner blade, the thickness of inner blade is along gear shaft to linearly changing, the thickness of all vibration and noise reducing sheets is equal and its thickness is 10% to 20% of maximum inner blade thickness, and equal and its thickness of the thickness of outer gear piece is 2 to 3 times of the thickness of maximum inner blade.In the technical program, in gear, the thickness of each vibration and noise reducing sheet is all equal, and the thickness of inner blade is different, the thickness of the inner blade that transverse tooth thickness is less is larger, the thickness of the inner blade that transverse tooth thickness is larger is less, this considers that its boundary dimension of inner blade that transverse tooth thickness is less is relatively little, under same thickness, its resonant frequency is higher, suitable increase thickness can make its resonant frequency decline, avoid the noise band of gear wide, be conducive to adopting the vibration and noise reducing sheet of single damping characteristic to eliminate the rotational noise of gear, thus reduce noise.
3, the thickness of the inner blade that transverse tooth thickness is less is greater than the thickness of the larger inner blade of transverse tooth thickness, and the thickness of maximum ga(u)ge inner blade is 1.5 to 2 times of the thickness of minimum thickness inner blade, and the thickness of inner blade is along gear shaft to linearly changing; The thickness being positioned at the vibration and noise reducing sheet of the larger inner blade side of transverse tooth thickness is greater than the thickness of the vibration and noise reducing sheet being positioned at the less inner blade side of transverse tooth thickness, the thickness of maximum ga(u)ge vibration and noise reducing sheet is 1.5 to 2 times of the thickness of minimum thickness vibration and noise reducing sheet, the thickness of vibration and noise reducing sheet is along gear shaft to linearly changing, the maximum ga(u)ge of vibration and noise reducing sheet is 15% to 30% of maximum inner blade thickness, and equal and its thickness of the thickness of outer gear piece is 2 to 3 times of the thickness of maximum inner blade.Be the integration scenario of aforementioned 1,2 two schemes in the technical program, its working principle is basically identical, structure relative complex, but has better effect of vibration and noise reduction.
As preferably, inner blade comprises the inner blade structure of two kinds of different hardness, the difference of its hardness number of the inner blade of two kinds of different hardness is 10% to 15% of high hardness inner blade hardness number, the inner blade of two kinds of different hardness is alternately arranged, the total quantity of described inner blade is odd number, inner blade its hardness adjacent with outer gear piece is higher than the inner blade be adjacent, and described outer gear piece adopts composite damping steel plate structure.Adopt the inner blade of two kinds of different hardness to be conducive to the dispersion of the noise frequency point of inner blade, thus reduce the noise peak of same Frequency point, avoid noise frequency to concentrate on a frequency, be conducive to the maximum value reducing gear noise.The difference of hardness number is here 10% to 15% of high hardness inner blade hardness number, for benchmark with the inner blade hardness number of high hardness, the hardness number of the inner blade of low hardness and the difference of high hardness inner blade hardness number are relative to the percentage of the inner blade hardness number of high hardness, for example, when the inner blade hardness number of high hardness is HRC50, then the hardness number of the inner blade of low hardness is HRC42.5-HRC45; The inner blade of two kinds of different hardness can be the material that two kinds of hardness is different, and also can be commaterial obtains two kinds of different hardness by different heat treatment modes; And outer gear piece adopts composite damping steel plate structure also effectively can suppress the propagation vibrated, thus reduce noise.
As preferably, every sheet vibration and noise reducing sheet is made up of single damping material, gear is provided with two kinds of vibration and noise reducing sheets be made up of the damping material of different damping characteristic, and the corresponding two kinds of frequencies of fissipation factor peak value of two kinds of vibration and noise reducing sheets, two kinds of vibration and noise reducing sheets are alternately arranged between the gear piece of gear.For the gear of above-mentioned employing two kinds of different hardness inner blades, the structure of the technical program can be adaptive with it, adopts two kinds of vibration and noise reducing sheets with corresponding damping characteristic to suppress corresponding noise, can reach good noise reduction.
Vibration and noise reducing sheet can also adopt structural type below:
1, every sheet vibration and noise reducing sheet is made up of single damping material, gear is provided with the two or more vibration and noise reducing sheet be made up of the damping material of different damping characteristic, the frequency that the fissipation factor peak value of often kind of vibration and noise reducing sheet is corresponding different, vibration and noise reducing sheet alternate cycles between the gear piece of gear of different damping characteristic is arranged.The technical program is for more than three kinds and three kinds but sum is less than the vibration and noise reducing sheet situation of gear piece gap number, such as vibration and noise reducing sheet is three kinds, but the gear piece gap number of gear is six, now three kinds of vibration and noise reducing sheets are at the arrangement mode axially adopting 1+2+3+1+2+3 of gear, the plan of establishment of this vibration and noise reducing sheet is mainly used in broadening vibration and noise reducing sheet frequency and suppresses scope, can use in the gear train assembly that some frequency noise scope is larger.
2, every sheet vibration and noise reducing sheet is made up of single damping material, on gear, the vibration and noise reducing sheet of diverse location is made up of the damping material of different damping characteristic, the frequency that the fissipation factor peak value of every sheet vibration and noise reducing sheet is corresponding different, vibration and noise reducing sheet being axially arranged in order by the frequency size corresponding to fissipation factor peak value at gear of different damping characteristic, the frequency corresponding to its fissipation factor peak value of vibration and noise reducing sheet that the frequency corresponding to its fissipation factor peak value of vibration and noise reducing sheet be close to of the outer gear piece less with transverse tooth thickness is close to higher than the outer gear piece larger with transverse tooth thickness.The technical program be adopt with the identical number of gear piece gap number, there is different damping characteristic vibration and noise reducing sheet to suppress gear noise, the plan of establishment of this vibration and noise reducing sheet is also mainly suppress scope for broadening vibration and noise reducing sheet frequency, can use in the gear train assembly that some frequency noise scope is larger.
Vibration and noise reducing sheet of the present invention can adopt polymer damping material, also can adopt alloy damping material, the frequency that its fissipation factor peak value of the damping material of different damping characteristic is corresponding different, can have a lot of selections.The frequency that ethylene propylene diene rubber in such as macromolecular material is corresponding is about 750Hz, and butyl rubber is about 450 Hz, and natural rubber is about 580 Hz, and CD 2 chlorobutadiene-acrylonitrile copolymer is about 250 Hz; Also polyacrylate, polyurethane, epoxy resin and nitrile butadiene rubber etc. can be selected.Damping alloy also has a large amount in variety, as Al-Zn alloy, Mn-Cu alloy, Mg-Zi alloy and Ni-Ti alloy etc., iron-based damping alloy just has the multiple high damping alloy material such as Fe-Cr-Al, Fe-Al, Fe-Mo, Fe-W, Fe-Cr-Mo, Fe-Cr-Co, description and the characteristic thereof of vibration and noise reducing material belong to known technology, actual can choose suitable material according to system of selection disclosed by the invention and according to the actual conditions of gear or gear train when using and make vibration and noise reducing sheet.
As preferably, vibration and noise reducing sheet is provided with frequency trim hole, and described frequency trim hole is 3 to 6, and the circumference along inner blade is evenly arranged, and the frequency trim hole on adjacent two panels vibration and noise reducing sheet shifts to install.Vibration and noise reducing sheet arranges frequency trim hole and can finely tune damped frequency peak point position corresponding to vibration and noise reducing sheet, thus make vibration and noise reducing sheet meet different frequency suppression requirements, frequency trim hole can be arranged on part vibration and noise reducing sheet, also can be arranged on all vibration and noise reducing sheets, when adjacent two panels vibration and noise reducing sheet all arranges frequency trim hole, frequency trim hole should be avoided to appear at the axially same of gear, namely avoid part gear piece both sides to occur the situation of cavity simultaneously, prevent from causing new vibration.
The processing method of combined variable tooth thickness gear of the present invention is: some sheet metals are processed into thickening gear piece by the profile of tooth specified and size, each gear piece is undertaken superimposed by the order alignment of regulation, and between gear piece, glued joint vibration and noise reducing sheet, by arranging screw or all gear pieces are fixed by rivet in fixed hole, finally form a complete change transverse tooth thickness tangent modification inner gear structure.
The invention has the beneficial effects as follows: it efficiently solves the large problem of the variable tooth thickness gear gearing noise of the variable tooth thickness gear processing difficulties of prior art and prior art, combined variable tooth thickness gear of the present invention, gear is formed in gear piece overlapping combinations mode, unlike material, different-thickness can be adopted, and the sheet metal fine finishing of different heat treatment state forms gear piece, Gearmaking Technology is good, apply simple technique and just can complete Hardened gear face and the processing of high-precision variable tooth thickness gear, thus improve bearing capacity and the running precision of transmission device; And glued joint vibration and noise reducing sheet between gear piece, suppress the mesh vibration of gear from root, decrease rotational noise, extend the working life of gear pair, be specially adapted to high-precision transmission device.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation of combined variable tooth thickness gear of the present invention;
Fig. 2 is a kind of cross-sectional structure schematic diagram of internal gear of the present invention;
A kind of structural representation of Fig. 3 inner blade of the present invention;
A kind of structural representation of Fig. 4 vibration and noise reducing of the present invention sheet.
In figure: 1. outer gear piece, 2. inner blade, 3. vibration and noise reducing sheet, the 4. gear teeth, 5. fixed hole, 6. frequency trim hole, 7. rivet.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
Embodiment 1
In the embodiment 1 shown in Fig. 1 Fig. 2, a kind of combined variable tooth thickness gear, described gear has the identical number of teeth by 10 and the ring gear piece sequential combination with thickening profile of tooth is formed, the gear teeth of gear piece are arranged on the inner circumference of ring gear piece, described gear piece comprises to be located at gear shaft and to see Fig. 3 to the outer gear piece 1 at two ends and 8 inner blade 2(between two outer gear pieces), the thickness of all inner blades is equal, the thickness of outer gear piece is 4 times of inner blade thickness, all glued joint between adjacent gear piece and have vibration and noise reducing sheet 3, 9 vibration and noise reducing sheets are set altogether, the thickness of described vibration and noise reducing sheet is 30% of inner blade thickness, the annulus of gear piece is provided with some for fixing gear piece mounting hole 5, the tip diameter of described gear piece and root diameter are all equal, the transverse tooth thickness of described gear piece is along the same axial increasing or decreasing of gear, the modification coefficient of gear is along gear shaft to linearly changing, inside and outside gear piece and vibration and noise reducing sheet are fixed by rivet 7 one be arranged in fixed hole, inside and outside gear piece and vibration and noise reducing sheet form a complete change transverse tooth thickness tangent modification internal spur gear structure.
Embodiment 2
The gear of embodiment 2 is helical gear, the thickness of 7 inner blades in gear is equal, vibration and noise reducing sheet is 8, the thickness being positioned at the vibration and noise reducing sheet of the larger inner blade side of transverse tooth thickness is greater than the thickness of the vibration and noise reducing sheet being positioned at the less inner blade side of transverse tooth thickness, the thickness of vibration and noise reducing sheet is along gear shaft to linearly changing, the minimum thickness of vibration and noise reducing sheet is 15% of inner blade thickness, the maximum ga(u)ge of vibration and noise reducing sheet is 30% of inner blade thickness, equal and its thickness of the thickness of outer gear piece is 3 times of inner blade thickness, and all the other are identical with embodiment 1.
Embodiment 3
In embodiment 3, gear comprises 9 inner blades and 10 vibration and noise reducing sheets, inner blade has different thickness, the thickness of the inner blade that transverse tooth thickness is less is greater than the thickness of the larger inner blade of transverse tooth thickness, the thickness of maximum ga(u)ge inner blade is 1.8 times of the thickness of minimum thickness inner blade, the thickness of inner blade is along gear shaft to linearly changing, the thickness of all vibration and noise reducing sheets is equal and its thickness is 18% of maximum inner blade thickness, equal and its thickness of the thickness of outer gear piece is 2.5 times of the thickness of maximum inner blade, and all the other are identical with embodiment 1 or embodiment 2.
Embodiment 4
In example 4, gear comprises 10 inner blades and 11 vibration and noise reducing sheets, inner blade has different thickness, the thickness of the inner blade that transverse tooth thickness is less is greater than the thickness of the larger inner blade of transverse tooth thickness, the thickness of maximum ga(u)ge inner blade is 1.6 times of the thickness of minimum thickness inner blade, and the thickness of inner blade is along gear shaft to linearly changing; Vibration and noise reducing sheet has different thickness, the thickness being positioned at the vibration and noise reducing sheet of the larger inner blade side of transverse tooth thickness is greater than the thickness of the vibration and noise reducing sheet being positioned at the less inner blade side of transverse tooth thickness, the thickness of maximum ga(u)ge vibration and noise reducing sheet is 1.7 times of the thickness of minimum thickness vibration and noise reducing sheet, the thickness of vibration and noise reducing sheet is along gear shaft to linearly changing, the maximum ga(u)ge of vibration and noise reducing sheet is 20% of maximum inner blade thickness, equal and its thickness of the thickness of outer gear piece is 2 times of the thickness of maximum inner blade, and all the other are identical with embodiment 1 or embodiment 2.
Embodiment 5
In embodiment 5, the total quantity of gear inner blade is odd number, comprise 11 inner blades and 12 vibration and noise reducing sheets, inner blade comprises the inner blade structure of two kinds of different hardness, the difference of its hardness number of the inner blade of two kinds of different hardness is 10% of high hardness inner blade hardness number, the inner blade of two kinds of different hardness is alternately arranged, inner blade its hardness adjacent with outer gear piece is higher than the inner blade be adjacent, and described outer gear piece adopts composite damping steel plate structure.The inner blade of two kinds of different hardness of the present embodiment is that commaterial is obtained by different heat treatment modes, also can select the material that two kinds of hardness is different.Every sheet vibration and noise reducing sheet of embodiment 5 is made up of single damping material, gear is provided with two kinds of vibration and noise reducing sheets be made up of the damping material of different damping characteristic, the corresponding two kinds of frequencies of fissipation factor peak value of two kinds of vibration and noise reducing sheets, two kinds of vibration and noise reducing sheets are alternately arranged between the gear piece of gear, all the other with embodiment 1 embodiment 2 or embodiment 3 or embodiment 4 identical.
Embodiment 6
In embodiment 6, gear comprises 5 inner blades and 6 vibration and noise reducing sheets, every sheet vibration and noise reducing sheet is made up of single damping material, gear is provided with three kinds of vibration and noise reducing sheets be made up of the damping material of different damping characteristic, the fissipation factor peak value correspondence not frequency of often kind of vibration and noise reducing sheet, vibration and noise reducing sheet alternate cycles between the gear piece of gear of different damping characteristic is arranged.The vibration and noise reducing sheet of the present embodiment is three kinds, and the gear piece gap number of gear is six, three kinds of vibration and noise reducing sheets at the arrangement mode axially adopting 1+2+3+1+2+3 of gear, all the other with embodiment 1 embodiment 2 or embodiment 3 or embodiment 4 identical.
Embodiment 7
In embodiment 7, gear comprises 6 inner blades and 7 vibration and noise reducing sheets, every sheet vibration and noise reducing sheet is made up of single damping material, on gear, the vibration and noise reducing sheet of diverse location is made up of the damping material of different damping characteristic, the frequency that the fissipation factor peak value of every sheet vibration and noise reducing sheet is corresponding different, vibration and noise reducing sheet being axially arranged in order by the frequency size corresponding to fissipation factor peak value at gear of different damping characteristic, frequency corresponding to its fissipation factor peak value of vibration and noise reducing sheet that the frequency corresponding to its fissipation factor peak value of vibration and noise reducing sheet be close to of the outer gear piece less with transverse tooth thickness is close to higher than the outer gear piece larger with transverse tooth thickness, all the other with embodiment 1 embodiment 2 or embodiment 3 or embodiment 4 identical.
Embodiment 8
In embodiment 8, vibration and noise reducing sheet is provided with frequency trim hole 6(and sees Fig. 4), described frequency trim hole is 6, circumference along inner blade is evenly arranged, frequency trim hole on adjacent two panels vibration and noise reducing sheet shifts to install, the structural type that the present embodiment arranges frequency trim hole on vibration and noise reducing sheet can adopt on the vibration and noise reducing sheet of any one embodiment above-mentioned, namely in above-described embodiment 1-7, adopt the vibration and noise reducing sheet with frequency trim hole just to form the new embodiment of the present invention, frequency trim hole can be arranged on part vibration and noise reducing sheet, also can be arranged on all vibration and noise reducing sheets.
Vibration and noise reducing sheet of the present invention can adopt polymer damping material, also can adopt alloy damping material, the frequency that its fissipation factor peak value of the damping material of different damping characteristic is corresponding different, can have a lot of selections.The frequency that ethylene propylene diene rubber in such as macromolecular material is corresponding is about 750Hz, and butyl rubber is about 450 Hz, and natural rubber is about 580 Hz, and CD 2 chlorobutadiene-acrylonitrile copolymer is about 250 Hz; Also polyacrylate, polyurethane, epoxy resin and nitrile butadiene rubber etc. can be selected.Damping alloy also has a large amount in variety, as Al-Zn alloy, Mn-Cu alloy, Mg-Zi alloy and Ni-Ti alloy etc., iron-based damping alloy just has the multiple high damping alloy material such as Fe-Cr-Al, Fe-Al, Fe-Mo, Fe-W, Fe-Cr-Mo, Fe-Cr-Co, description and the characteristic thereof of vibration and noise reducing material belong to known technology, actual can choose suitable material according to system of selection disclosed by the invention and according to the actual conditions of gear or gear train when using and make vibration and noise reducing sheet.
The processing method of combined variable tooth thickness gear of the present invention is: some thin slices are processed into thickening gear piece by the profile of tooth specified and size, each gear piece is undertaken superimposed by the order alignment of regulation, and between gear piece, glued joint vibration and noise reducing sheet, by arranging screw or all gear pieces are fixed by rivet in fixed hole, finally form a complete change transverse tooth thickness tangent modification inner gear structure.
Combined variable tooth thickness gear of the present invention is made up of the gear piece combination that some have thickening profile of tooth, gear piece comprise be arranged on gear shaft to the upper outside gear piece of both ends of the surface and outer gear piece between some inner blades, vibration and noise reducing sheet is gluedd joint between adjacent gear piece, inside and outside gear piece and vibration and noise reducing sheet are fixed by the screw in fixed hole or rivet joint, thus form an overall variable tooth thickness gear.Overlapping combinations mode is adopted to form variable tooth thickness gear, because single gear piece thickness is less, therefore easily processing request is reached, Gearmaking Technology is good, apply simple technique and just can complete Hardened gear face and the processing of high-precision variable tooth thickness gear, solve the problem of the variable tooth thickness gear processing difficulties of prior art.In addition, be equipped with vibration and noise reducing sheet between the gear piece that the present invention is adjacent, vibration and noise reducing sheet has high damping characteristic, be located between gear piece, the vibration that can effectively suppress gears meshing to cause, namely reduces the mesh vibration of gear from root, reduce rotational noise, thus reduce noise.Therefore structure of the present invention can solve the large problem of the variable tooth thickness gear gearing noise of prior art, also can extend the working life of gear pair simultaneously, be specially adapted to high-precision transmission device.
In addition to the implementation; in the scope disclosed in claims of the present invention and specification; technical characteristics of the present invention or technical data can carry out reselecting and combining; thus form new mode of execution; the mode of execution that these the present invention do not describe in detail is that those skilled in the art just can realize easily without the need to creative work, and therefore these mode of executions do not described in detail also should be considered as specific embodiments of the invention and within protection scope of the present invention.
Claims (10)
1. a combined variable tooth thickness gear, it is characterized in that: described gear has the identical number of teeth by some and the ring gear piece sequential combination with thickening profile of tooth is formed, the gear teeth (4) of gear piece are arranged on the inner circumference of ring gear piece, described gear piece comprises is located at gear shaft to the outer gear piece (1) at two ends and the some inner blades (2) between two outer gear pieces, the thickness of outer gear piece is greater than the thickness of inner blade, all glued joint between adjacent gear piece and have vibration and noise reducing sheet (3), the annulus of gear piece is provided with some for fixing gear piece mounting hole (5), the tip diameter of described gear piece and root diameter are all equal, the transverse tooth thickness of described gear piece is along the same axial increasing or decreasing of gear, inside and outside gear piece and vibration and noise reducing sheet form a complete change transverse tooth thickness tangent modification inner gear structure.
2. combined variable tooth thickness gear according to claim 1, is characterized in that: the gear teeth of described gear are straight-tooth or helical teeth, and the modification coefficient of described gear is along gear shaft to linearly changing.
3. combined variable tooth thickness gear according to claim 1, it is characterized in that: the thickness of all inner blades is equal, the thickness of all vibration and noise reducing sheets is equal and its thickness is 15% to 30% of inner blade thickness, and equal and its thickness of the thickness of outer gear piece is 3 to 5 times of inner blade thickness.
4. combined variable tooth thickness gear according to claim 1, it is characterized in that: the thickness of all inner blades is equal, the thickness being positioned at the vibration and noise reducing sheet of the larger inner blade side of transverse tooth thickness is greater than the thickness of the vibration and noise reducing sheet being positioned at the less inner blade side of transverse tooth thickness, the thickness of vibration and noise reducing sheet is along gear shaft to linearly changing, the minimum thickness of vibration and noise reducing sheet is 15% to 20% of inner blade thickness, the maximum ga(u)ge of vibration and noise reducing sheet is 25% to 30% of inner blade thickness, and equal and its thickness of the thickness of outer gear piece is 3 to 5 times of inner blade thickness.
5. combined variable tooth thickness gear according to claim 1, it is characterized in that: the thickness of the inner blade that transverse tooth thickness is less is greater than the thickness of the larger inner blade of transverse tooth thickness, the thickness of maximum ga(u)ge inner blade is 1.5 to 2 times of the thickness of minimum thickness inner blade, the thickness of inner blade is along gear shaft to linearly changing, the thickness of all vibration and noise reducing sheets is equal and its thickness is 10% to 20% of maximum inner blade thickness, and equal and its thickness of the thickness of outer gear piece is 2 to 3 times of the thickness of maximum inner blade.
6. combined variable tooth thickness gear according to claim 1, it is characterized in that: the thickness of the inner blade that transverse tooth thickness is less is greater than the thickness of the larger inner blade of transverse tooth thickness, the thickness of maximum ga(u)ge inner blade is 1.5 to 2 times of the thickness of minimum thickness inner blade, and the thickness of inner blade is along gear shaft to linearly changing; The thickness being positioned at the vibration and noise reducing sheet of the larger inner blade side of transverse tooth thickness is greater than the thickness of the vibration and noise reducing sheet being positioned at the less inner blade side of transverse tooth thickness, the thickness of maximum ga(u)ge vibration and noise reducing sheet is 1.5 to 2 times of the thickness of minimum thickness vibration and noise reducing sheet, the thickness of vibration and noise reducing sheet is along gear shaft to linearly changing, the maximum ga(u)ge of vibration and noise reducing sheet is 15% to 30% of maximum inner blade thickness, and equal and its thickness of the thickness of outer gear piece is 2 to 3 times of the thickness of maximum inner blade.
7. the combined variable tooth thickness gear according to any one of claim 1-6, it is characterized in that: inner blade comprises the inner blade structure of two kinds of different hardness, the difference of its hardness number of the inner blade of two kinds of different hardness is 10% to 15% of high hardness inner blade hardness number, the inner blade of two kinds of different hardness is alternately arranged, the total quantity of described inner blade is odd number, inner blade its hardness adjacent with outer gear piece is higher than the inner blade be adjacent, and described outer gear piece adopts composite damping steel plate structure.
8. combined variable tooth thickness gear according to claim 7, it is characterized in that: every sheet vibration and noise reducing sheet is made up of single damping material, gear is provided with two kinds of vibration and noise reducing sheets be made up of the damping material of different damping characteristic, the corresponding two kinds of frequencies of fissipation factor peak value of two kinds of vibration and noise reducing sheets, two kinds of vibration and noise reducing sheets are alternately arranged between the gear piece of gear.
9. the combined variable tooth thickness gear according to any one of claim 1-6, it is characterized in that: every sheet vibration and noise reducing sheet is made up of single damping material, on gear, the vibration and noise reducing sheet of diverse location is made up of the damping material of different damping characteristic, the frequency that the fissipation factor peak value of every sheet vibration and noise reducing sheet is corresponding different, vibration and noise reducing sheet being axially arranged in order by the frequency size corresponding to fissipation factor peak value at gear of different damping characteristic, frequency corresponding to its fissipation factor peak value of vibration and noise reducing sheet that the frequency corresponding to its fissipation factor peak value of vibration and noise reducing sheet be close to of the outer gear piece less with transverse tooth thickness is close to higher than the outer gear piece larger with transverse tooth thickness.
10. the combined variable tooth thickness gear according to any one of claim 1-6, it is characterized in that: vibration and noise reducing sheet is provided with frequency trim hole (6), described frequency trim hole is 3 to 6, circumference along inner blade is evenly arranged, and the frequency trim hole on adjacent two panels vibration and noise reducing sheet shifts to install.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510068215.1A CN104675955B (en) | 2015-02-09 | 2015-02-09 | Combined variable tooth thickness gear |
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| CN201510068215.1A CN104675955B (en) | 2015-02-09 | 2015-02-09 | Combined variable tooth thickness gear |
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| CN104675955A true CN104675955A (en) | 2015-06-03 |
| CN104675955B CN104675955B (en) | 2017-01-25 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111853202A (en) * | 2020-06-23 | 2020-10-30 | 广西玉柴机器股份有限公司 | Vibration reduction gear and engine thereof |
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| CN104675955B (en) | 2017-01-25 |
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