CN108302162B - Planetary gear train based on high-damping flexible support frame and design method of support frame - Google Patents

Planetary gear train based on high-damping flexible support frame and design method of support frame Download PDF

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CN108302162B
CN108302162B CN201810078287.8A CN201810078287A CN108302162B CN 108302162 B CN108302162 B CN 108302162B CN 201810078287 A CN201810078287 A CN 201810078287A CN 108302162 B CN108302162 B CN 108302162B
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gear ring
inner gear
support frame
damping
ring
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CN108302162A (en
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盛冬平
陈川
李晓贞
陈勇将
肖华星
金祥曙
尹飞鸿
胡少刚
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Changzhou Institute of Technology
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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
    • F16H1/00—Toothed gearings for conveying rotary motion
    • F16H1/28—Toothed gearings for conveying rotary motion with gears having orbital motion
    • F16H1/2809—Toothed gearings for conveying rotary motion with gears having orbital motion with means for equalising the distribution of load on the planet-wheels
    • 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
    • F16H57/00—General details of gearing
    • F16H57/08—General details of gearing of gearings with members having orbital motion
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/10—Geometric CAD
    • G06F30/17—Mechanical parametric or variational design
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • 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
    • F16H57/00—General details of gearing
    • F16H2057/0087—Computer aided design [CAD] specially adapted for gearing features ; Analysis of gear systems
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation

Abstract

The invention discloses a planetary gear train based on a high-damping flexible support frame and a design method of the support frame. The planetary gear train comprises a sun gear assembly, a high-damping flexible support frame, an inner gear ring, a planetary gear and a planet carrier assembly, wherein the sun gear assembly comprises a sun gear input shaft and a sun gear fixed on the sun gear input shaft, the planetary gear is arranged between the sun gear and the inner gear ring and is respectively meshed with the sun gear and the inner gear ring, the inner gear ring is sleeved in the high-damping flexible support frame, a support pin is installed on the planet carrier assembly, and the planetary gear is installed on the support pin through a planetary gear bearing. The invention provides a structural design mode of assembling a high-damping alloy support frame outside an inner gear ring, which realizes the improvement of the flexibility and the damping ratio of the inner gear ring, thereby improving the load balancing performance of a system, and realizing the aims of improving the highest output power of the system and reducing vibration and noise.

Description

Planetary gear train based on high-damping flexible support frame and design method of support frame
Technical Field
The invention relates to a planetary gear train structure, in particular to a planetary gear train with a high-damping flexible support frame and a design method of the support frame.
Background
The planetary gear train mainly comprises a sun gear, a sun gear input shaft, an inner gear ring, a planetary gear, a planetary carrier and the like. The load balancing performance of the whole planetary gear train, namely the uniformity of the load borne by each planet gear is a more prominent problem in the planetary gear transmission system, and the problem is not well solved so far because the problem is directly related to the maximum output power, vibration and noise, so that the problem is one of important indexes for evaluating the performance of the planetary gear transmission system. At present, the main means for improving the load balancing performance of the planetary gear train comprise the following aspects: (1) the flexibility of the inner gear ring is improved; (2) the flexibility of the planet carrier is improved; (3) sun gear and sun gear input shaft floating structure. At present, in practical application, a floating structure of a sun gear and a sun gear input shaft is applied, and the improvement of the flexibility of a gear ring and a planet carrier is still basically in a theoretical stage and is not applied practically.
Disclosure of Invention
The purpose of the invention is: under the condition that the combined inner gear ring meets the requirements of strength, rigidity, fatigue and the like, the load-sharing characteristic of the planetary gear train is obviously improved, so that the output power of the system is improved, and vibration and noise are reduced.
The technical scheme of the invention is as follows:
the invention provides a planetary gear train based on a high-damping flexible support frame, which comprises a sun gear assembly, the high-damping flexible support frame, an inner gear ring, a planetary gear and a planet carrier assembly, wherein the sun gear assembly comprises a sun gear input shaft and a sun gear fixed on the sun gear input shaft, the planetary gear is arranged between the sun gear and the inner gear ring and is respectively meshed with the sun gear and the inner gear ring, the inner gear ring is sleeved in the high-damping flexible support frame, a support pin is installed on the planet carrier assembly, and the planetary gear is installed on the support pin through a planetary gear bearing.
Furthermore, the inner gear ring is mounted together with the high-damping flexible support frame in an interference fit or threaded connection or fixed pin connection mode.
Further, the planet wheel sets up 3 at least.
The invention also provides a design method of the support frame in the planetary gear train based on the high-damping flexible support frame, which comprises the following steps:
step 1: obtaining system design parameters of planetary gear train including input workRatio, transmission ratio, number of teeth z of planet wheel/sun wheel/inner gear ring1、z2、z3And parameters of modulus m;
step 2: thickness P from tooth root of inner gear ring to outer ring1Outer diameter P2Height P3Wall thickness P of the support4As a design variable parameter;
and step 3: according to the initial P1、P2、P3And P4Designing an assembly of the inner gear ring according to the initial value;
and 4, step 4: carrying out static stiffness calculation and modal analysis on the preliminarily designed inner gear ring to obtain required parameters;
and 5: variation parameter P1、P2、P3And P4Obtaining the supporting rigidity K of the inner gear ring within the parameter variable range of the inner gear ring assembly through cyclic calculationxAnd damping ratio crMaximum value of product of Max (K)1) P of1、P2、P3And P4Parameter domain of [ P ]a]Torsional rigidity KtAnd damping ratio crMaximum value of product of Max (K)2) P of1、P2、P3And P4Parameter domain of [ P ]b]；
Step 6: checking whether the strength and the service life of the inner gear ring and the damping support frame thereof under the set of parameters meet the design requirements, and if so, finishing the design based on the high-damping inner gear ring assembly; if not, adjust P1、P2、P3And P4And recalculating to obtain the optimal value of the parameter range.
Further, in step 4, the parameter includes torsional rigidity ktAnd support rigidity I nkxNatural frequency f, modal damping ratio crWherein, in the step (A),
Figure BDA0001560251480000021
wherein F is a force applied to the inner ring gear in one direction, dxFor the displacement, T is applied to the ring gearTorque of ddIs the angular displacement of the inner gear ring.
Further, in said step 5, [ P ] is takena]And [ Pb]Intersection of parameter domains, selecting the appropriate P within the parameter domain1、P2、P3And P4(ii) a Is represented as follows:
Figure BDA0001560251480000022
the invention has the following beneficial effects:
(1) the flexibility of the inner gear ring is improved, so that the load balancing performance of the planetary gear train system is improved, and the highest output power of the system is improved;
(2) reduce the vibration and noise of the planetary gear train and prolong the fatigue life.
Drawings
FIG. 1 is a schematic diagram of a planetary gear train assembly.
Fig. 2 is an explanatory view of the overall composition of the planetary gear train.
FIG. 3 is a schematic view of a ring gear assembly configuration.
Fig. 4 is an exploded view of the ring gear.
Fig. 5 is a cross-sectional view of a high damping flexible ring gear assembly.
Fig. 6 is a partial view of a high damping flexible ring gear assembly.
Fig. 7 is a flow chart of the design of the high damping carrier elastic support pin.
In the figure: 1-sun gear assembly, 2-high damping flexible support frame, 3-inner gear ring, 4-planet gear, 5-planet gear bearing and 6-planet carrier assembly
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The planetary gear train based on the high-damping flexible support frame is structurally shown in figures 1 and 2, wherein the structure of the inner gear ring assembly is shown in figures 3 and 4, and the structure of the high-damping flexible inner gear ring assembly is shown in figures 5 and 6. The planetary gear train structurally comprises a sun gear assembly 1, a high-damping flexible support frame 2, an inner gear ring 3, a planet gear 4, a planet gear bearing 5 and a planet carrier assembly 6. The sun wheel assembly 1 comprises a sun wheel input shaft and a sun wheel fixed on the sun wheel input shaft, and the planet wheel 4 is arranged between the sun wheel and the inner gear ring 3 and is respectively meshed with the sun wheel and the inner gear ring 3. The inner gear ring 3 is sleeved in the high-damping flexible support frame 2, and the planet carrier assembly 6 is provided with a support pin. The planet wheels 4 are mounted on support pins 6 by means of planet wheel bearings 5. The inner gear ring assembly comprises an inner gear ring 3 and a high-damping alloy support frame 2, wherein the inner gear ring 3 is installed together with the support frame 2 in an interference fit, threaded connection or fixed pin connection mode.
The high-damping alloy inner gear ring support frame has the strength of low-carbon steel and high damping performance, the logarithmic decrement of the high-damping alloy inner gear ring support frame can reach 0.63 at most, and the basic physical properties are as follows:
young's modulus 70GPa(＜70K)
Thermal conductivity 10W/mK(300K)
Specific heat 512.7J/KgK(300K)
Thermal expansion rate 22.4*10－6/deg(300K)
Density of 7250kg/m3
Mechanical properties at Normal temperature:
thermal treatment Yield strength (MPa) Tensile strength (Mpa) Percentage of elongation%
Annealing 215 500 35
The chemical components mainly comprise (unit%):
Mn Cu Ni Fe
70.6 22.3 5.1 2.0
the inner gear ring support frame designed by the damping alloy can obviously improve the damping performance of a system under the condition of not sacrificing strength, rigidity and fatigue life, thereby obviously improving the uniform load performance of the inner gear ring support frame and obviously reducing the vibration and noise level of the system.
The design method of the high-damping flexible support frame is shown in fig. 7, parameters such as the inner diameter P2, the height P3, the wall thickness P4 and the like of the high-damping ring gear support frame are determined according to the input torque of a sun gear, the transmission ratio of a planetary gear train, the number of planetary gears and specific parameters, the parameters are set as variable parameters, and the maximum damping ratio of the system can be obtained by performing modal analysis and hammering tests on an inner gear ring assembly, and the specific design method is as follows:
(1) obtaining the system design parameters of the planetary gear train, including input power, transmission ratio, and the number of teeth z of the planetary gear/sun gear/inner gear ring1、z2、z3And modulus m;
(2) thickness P from tooth root of inner gear ring to outer ring1Outer diameter P2Height P3Wall thickness P of the support4As a design variable parameter;
(3) according to the initial P1、P2、P3And P4Designing an assembly of the inner gear ring according to the initial value;
(4) static rigidity calculation and modal analysis are carried out on the preliminarily designed inner gear ring to obtain torsional rigidity k of the inner gear ringtAnd support rigidity I nkxNatural frequency f, modal damping ratio crThe like;
Figure BDA0001560251480000041
wherein F is a force applied to the inner ring gear in one direction, dxFor the displacement, T is the torque applied to the ring gear, ddIs the angular displacement of the inner gear ring.
(5) Variation parameter P1、P2、P3And P4Obtaining the supporting rigidity K of the inner gear ring within the parameter variable range of the inner gear ring assembly through cyclic calculationxAnd damping ratio crMaximum value of product of Max (K)1) P of1、P2、P3And P4Parameter domain of [ P ]a]Torsional rigidity KtAnd damping ratio crMaximum value of product of Max (K)2) P of1、P2、P3And P4Parameter domain of [ P ]b]Get [ P ]a]And [ Pb]Intersection of parameter domains, selecting the appropriate P within the parameter domain1、P2、P3And P4(ii) a Is formulated as follows:
[Pa]＝Max[K1]＝Max[cr][kx]
[Pb]＝Max[K2]＝Max[cr][kt]
Figure BDA0001560251480000051
P1∈(a1.......b1),P2∈(a2.......b2),P3∈(a3.......b3),P4∈(a4.......b4)
(6) and checking whether the strength and the service life of the inner gear ring and the damping support frame thereof under the set of parameters meet the design requirements, and if so, finishing the design based on the high-damping inner gear ring assembly. If not, adjust P1、P2、P3And P4And recalculating to obtain the optimal value of the parameter range.
In summary, the invention provides a structural design mode of assembling a high-damping alloy support frame outside an inner gear ring, so that the flexibility and the damping ratio of the inner gear ring are improved, the load balancing performance of a system can be improved, and the aims of improving the highest output power of the system and reducing vibration and noise are fulfilled.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (3)

1. The design method of the bearing frame in the planetary gear train based on the high-damping flexible bearing frame comprises the following steps:
step 1: obtaining the system design parameters of the planetary gear train, including input power, transmission ratio, and the number of teeth z of the planetary gear/sun gear/inner gear ring1、z2、z3And parameters of modulus m;
step 2: thickness P from tooth root of inner gear ring to outer ring1Outer diameter P2Height P3Wall thickness P of the support4As a design variable parameter;
and step 3: according to the initial P1、P2、P3And P4Designing an assembly of the inner gear ring according to the initial value;
and 4, step 4: static rigidity calculation and modal analysis are carried out on the preliminarily designed inner gear ring to obtain torsional rigidity ktSupport stiffness kxNatural frequency f, modal damping ratio crThe parameters of (1);
and 5: variation parameter P1、P2、P3And P4The parameters of the inner gear ring are obtained within a preset variable range through cyclic calculation, and the support rigidity K of the inner gear ring isxAnd damping ratio crMaximum value of product of Max (K)1) P of1、P2、P3And P4Parameter domain of [ P ]a]Torsional rigidity KtAnd damping ratio crMaximum value of product of Max (K)2) P of1、P2、P3And P4Parameter domain of [ P ]b]；
Step 6: verification P1、P2、P3、P4Whether the strength and the service life of the inner gear ring and the damping support frame thereof under the set of parameters meet the design requirements or not, if so, the design based on the high-damping inner gear ring assembly is completed; if not, adjust P1、P2、P3And P4And recalculating to obtain the optimal value of the parameter range.
2. The method of claim 1, wherein the method is performed in a batch modeCharacterized in that: in step 4, the torsional stiffness ktSupport stiffness kxNatural frequency f, modal damping ratio crWherein, in the step (A),
Figure FDA0002579169980000011
wherein F is a force applied to the inner ring gear in one direction, dxFor the displacement, T is the torque applied to the ring gear, ddIs the angular displacement of the inner gear ring.
3. The method of claim 1, wherein: in said step 5, [ P ] is takena]And [ Pb]Intersection of parameter domains, selecting the appropriate P within the parameter domain1、P2、P3And P4(ii) a Is represented as follows:
Figure FDA0002579169980000012
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Publication number Priority date Publication date Assignee Title
CN111288125B (en) * 2020-02-12 2021-03-19 常州工学院 Planetary gear transmission system with high-damping high-flexibility bearing nested structure
CN111255861A (en) * 2020-02-20 2020-06-09 常州工学院 Planetary gear train with adjustable supporting rigidity and flexible damping vibration isolation gear ring
CN116988876A (en) * 2022-04-25 2023-11-03 通用电气公司 Mounting assembly for a gearbox assembly

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CN102889338A (en) * 2011-07-17 2013-01-23 吴小杰 Novel star wheel speed reducer
CN103097153A (en) * 2010-08-21 2013-05-08 奥迪股份公司 Electric damper for a motor vehicle
CN203309075U (en) * 2013-01-23 2013-11-27 博世汽车部件(长沙)有限公司 Vehicle starter and overload protection and vibration damping device thereof
CN204186885U (en) * 2014-09-22 2015-03-04 张鲁 Novel high-power roller mill speed reducer
CN104500693A (en) * 2014-12-01 2015-04-08 重庆大学 Rigid-flexible composite filtering gear

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103097153A (en) * 2010-08-21 2013-05-08 奥迪股份公司 Electric damper for a motor vehicle
CN102649096A (en) * 2011-02-24 2012-08-29 西门子公司 Gear motor for a mill drive system
CN102889338A (en) * 2011-07-17 2013-01-23 吴小杰 Novel star wheel speed reducer
CN203309075U (en) * 2013-01-23 2013-11-27 博世汽车部件(长沙)有限公司 Vehicle starter and overload protection and vibration damping device thereof
CN204186885U (en) * 2014-09-22 2015-03-04 张鲁 Novel high-power roller mill speed reducer
CN104500693A (en) * 2014-12-01 2015-04-08 重庆大学 Rigid-flexible composite filtering gear

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