CN108006212B - Planet carrier based on high-damping alloy support pin and design method of support pin - Google Patents

Planet carrier based on high-damping alloy support pin and design method of support pin Download PDF

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CN108006212B
CN108006212B CN201810078306.7A CN201810078306A CN108006212B CN 108006212 B CN108006212 B CN 108006212B CN 201810078306 A CN201810078306 A CN 201810078306A CN 108006212 B CN108006212 B CN 108006212B
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gear
damping alloy
support pin
planet
pin
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CN108006212A (en
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盛冬平
李晓贞
陈川
金祥曙
尹飞鸿
陈勇将
徐红丽
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
    • F16H57/00—General details of gearing
    • F16H57/08—General details of gearing of gearings with members having orbital motion
    • F16H57/082—Planet carriers

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Abstract

The invention discloses a planet carrier based on a high-damping alloy support pin and a design method of the support pin. The planet carrier comprises a sun gear input shaft, an inner gear ring support frame, a gear ring gear assembly, a planet gear bearing, a support pin and a planet carrier, wherein the gear ring gear assembly comprises a sun gear, a planet gear and an inner gear ring, the planet 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 inner gear ring support frame, the sun gear is fixed on the sun gear input shaft, the support pin is arranged on the planet carrier, the high-damping alloy support pin is fixedly embedded in the support pin, and the planet gear is arranged on the support pin through the planet gear bearing. The invention provides a structural design mode of embedding high-damping alloy in a supporting pin of each planet wheel of a planet carrier, and the invention realizes the improvement of the load balancing performance of a planet wheel train, thereby realizing the purposes of improving the highest output power of the system and reducing vibration and noise.

Description

Planet carrier based on high-damping alloy support pin and design method of support pin
Technical Field
The present invention relates to a planet carrier structure, and more particularly, to a planet carrier structure with a high-damping alloy support pin and a method for designing the high-damping alloy support pin.
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: the uniform load characteristic of the planetary gear train is obviously improved under the condition that the planet carrier meets the conditions of strength, rigidity, fatigue and the like, 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 planet carrier based on a high-damping alloy supporting pin, which comprises a sun gear input shaft, an inner gear ring supporting frame, a gear ring gear assembly, a planet gear bearing, a supporting pin and a planet carrier, wherein the gear ring gear assembly comprises a sun gear, a planet gear and an inner gear ring, the planet 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 inner gear ring supporting frame, the sun gear is fixed on the sun gear input shaft, the supporting pin is arranged on the planet carrier, the high-damping alloy supporting pin is fixedly embedded in the supporting pin, and the planet gear is arranged on the supporting pin through the.
Further, the high-damping alloy support pin is mounted together with the support pin in an interference fit or threaded connection mode.
Further, the planet wheel sets up 3 at least.
The invention also provides a design method of the high-damping alloy support pin in the planet carrier based on the high-damping alloy support pin, which comprises the following steps of:
step 1: obtaining system design parameters of the planetary gear train, including input power P, transmission ratio i, number of teeth z of planetary gear/sun gear/inner gear ring1、z2、z3And parameters of modulus m;
step 2: calculating and determining the outer diameter and the length of the support pin of the planet carrier and taking the outer diameter as a design parameter P1And P2；
And step 3: designing an embedded pin shaft made of high-damping alloySetting the wall thickness of the pin shaft as a variable parameter P3；
And 4, step 4: carrying out static rigidity calculation and modal analysis on the pin shaft of the preliminarily designed planet carrier to obtain the natural frequency f and the modal damping ratio crThe parameters of (1);
and 5: variation parameter P1、P2And P3Obtaining the product K of the damping ratio of the planet carrier and the support rigidity of the elastic pin shaft in the parameter variable range through calculation and analysis, and obtaining the P when the maximum value is obtained1、P2And P3A value;
step 6: checking whether the strength and the service life of the elastic pin shaft of the planet carrier under the parameters meet the design requirements, and if so, completing the design based on the high-damping alloy support pin; if not, adjust P1、P2And P3And recalculating and obtaining the optimal value of the parameter range.
Further, in the step 4, the static support rigidity k in one direction is obtainedx，
Figure BDA0001560246990000021
Wherein F is a force applied to the top surface of the pin shaft perpendicular to the axis, dxIs the displacement of the pin under force F.
Further, in step 5, K is defined as a comprehensive dynamic performance parameter, and the rigidity and the damping performance of the support system are comprehensively considered, specifically:
Figure BDA0001560246990000022
the invention has the following beneficial effects:
(1) the load balancing performance of the planetary gear train system is improved, and the highest output power of the system is improved;
(2) reduce vibration and noise and prolong 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 structure view of a carrier assembly designed based on high damping sum.
FIG. 4 is a cross-sectional view of a planet carrier based on a high damping alloy design.
Fig. 5 is a flow chart of the design of the high damping planet carrier elastic support pin.
In the figure: the device comprises a sun gear input shaft 1, an inner gear ring 2, a gear ring 3, a planet gear bearing 4, a high-damping alloy support pin 5, a support pin 6 and a planet carrier 7.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The structure of the planet carrier based on the high damping alloy supporting pin is shown in fig. 1 and 2, wherein the structure of the planet carrier assembly is shown in fig. 3 and 4. The planet carrier comprises a sun gear input shaft 1, a gear ring gear assembly 3, a planet gear bearing 4, a high-damping alloy supporting pin 5, a supporting pin 6 and a planet carrier 7, and the planet carrier assembly comprises a planet carrier 7, a supporting pin 6 and a high-damping alloy supporting pin 5. The gear ring gear assembly 3 comprises a sun gear, a planet gear and an inner gear ring, wherein the planet 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 inner gear ring support frame 2. The sun gear is fixed to the sun gear input shaft 1. A support pin 6 is mounted on a planet carrier 7, a high damping alloy support pin 5 is embedded and fixed in the support pin, and the planet wheel is mounted on the support pin 6 through a planet wheel bearing 4. As a preferred connection, the high damping alloy support pin 5 may be mounted with the support pin 6 by interference fit or screw connection.
The high-damping alloy support pin 5 has the strength of low-carbon steel and high damping performance, the logarithmic decrement of the high-damping alloy support pin can reach 0.63 at most, and the basic physical properties are shown in the following table:
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 main chemical components comprise (unit%):
Mn Cu Ni Fe
70.6 22.3 5.1 2.0
the embedded pin shaft designed by the damping alloy can obviously improve the damping of a system under the condition of not sacrificing the bending rigidity and the fatigue life of the support pin, so that the load balancing performance of the embedded pin shaft is obviously improved, and the vibration and noise level of the system can also be obviously reduced.
The design method of the high-damping alloy support pin is shown in fig. 5, parameters such as the wall thickness and the length of the high-damping alloy pin shaft are determined according to the input torque of the sun gear, the transmission ratio of the planetary gear train, the number of the planetary gears and specific parameters, the maximum damping ratio of the system can be obtained by performing modal analysis and hammering tests on the planetary gear carrier, and the specific design method is as follows:
(1) obtaining system design parameters of the planetary gear train, including input power P, transmission ratio i, number of teeth z of planetary gear/sun gear/inner gear ring1、z2、z3And modulus m;
(2) calculating and determining the outer diameter and the length of the support pin of the planet carrier and taking the outer diameter as a design parameter P1And P2；
(3) Designing a pin shaft of embedded high-damping alloy, and designing the pin shaftThe wall thickness is set to a variable parameter P3；
(4) Static rigidity calculation and modal analysis of a pin shaft are carried out on the preliminarily designed planet carrier, and the natural frequency f and the modal damping ratio c can be directly obtained through softwarerEqual parameters and indirectly obtain the static support rigidity k of the same in one direction through a formulaxThe following formula is used:
Figure BDA0001560246990000041
wherein F is a force applied to the top surface of the pin shaft perpendicular to the axis, dxIs the displacement of the pin under force F.
(5) Variation parameter P1、P2And P3Obtaining the product K of the damping ratio of the planet carrier and the support rigidity of the elastic pin shaft in the parameter variable range through calculation and analysis, and obtaining the P when the maximum value is obtained1、P2And P3The value K is defined as a comprehensive dynamic performance parameter, the rigidity and the damping performance of the support system are comprehensively considered, and the value K is expressed by a formula:
Figure BDA0001560246990000042
(6) and checking whether the strength and the service life of the elastic pin shaft of the planet carrier under the parameters meet the design requirements, and if so, finishing the design based on the high-damping alloy support pin. If not, adjust P1、P2And P3And recalculating and obtaining the optimal value of the parameter range.
In conclusion, the invention provides a structural design mode of embedding high-damping alloy in the support pin of each planet wheel of the planet carrier, so that the load balancing performance of the planetary gear train is 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. A design method of a high-damping alloy supporting pin in a planetary gear train based on the high-damping alloy supporting pin, the planetary gear train based on the high-damping alloy supporting pin comprises a sun gear input shaft (1), an inner gear ring supporting frame (2), a gear ring gear assembly (3), a planetary gear bearing (4), a supporting pin (6) and a planetary carrier (7), the gear ring and gear assembly (3) comprises a sun gear, a planet gear and an inner gear ring, the planet gear is arranged between the sun gear and the inner gear ring, and are respectively engaged with the sun gear and the inner gear ring, the inner gear ring is sleeved in the inner gear ring supporting frame (2), the sun gear is fixed on the sun gear input shaft (1), the supporting pin (6) is arranged on the planet carrier (7), a high-damping alloy supporting pin (5) is embedded and fixed in the planet gear, and the planet gear is arranged on the supporting pin (6) through a planet gear bearing (4); the high-damping alloy supporting pin (5) is installed together with the supporting pin (6) in an interference fit or threaded connection mode; the number of the planet wheels is at least 3;
the design method comprises the following steps:
step 1: obtaining system design parameters of the planetary gear train, including input power P, transmission ratio i, number of teeth z of planetary gear/sun gear/inner gear ring1、z2、z3And parameters of modulus m;
step 2: calculating and determining the outer diameter and the length of the high-damping alloy support pin, and taking the outer diameter and the length as design parameters P1And P2；
And step 3: designing a high damping alloy support pin, and setting the wall thickness of the high damping alloy support pin as a variable parameter P3；
And 4, step 4: static stiffness calculation and modal analysis of the preliminarily designed planetary gear train are carried out to obtain the natural frequency f and the modal damping ratio crThe parameters of (1);
and 5: obtaining the parameter P of the planetary gear train through calculation and analysis1、P2And P3Obtaining the modal damping ratio c of the planetary gear trainrAnd a high damping alloy supportStatic support stiffness k of the pinxThe product of K, P is obtained when K takes the maximum value1、P2And P3A value;
step 6: checking at parameter P1、P2And P3Whether the strength and the service life of the lower high-damping alloy support pin meet the design requirements or not, and if so, completing the design based on the high-damping alloy support pin; if not, adjust P1、P2And P3And recalculating and obtaining the optimal value of the parameter range.
2. The method of claim 1, wherein: in the step 4, the static support stiffness k in one direction is obtainedx，
Figure FDA0002387695880000011
Wherein F is a force perpendicular to the axis and loaded on the top surface of the high damping alloy support pin, and dxIs the displacement of the high damping alloy support pin under force F.
3. The method of claim 1, wherein: in the step 5, K is defined as a comprehensive dynamic performance parameter, and the rigidity and the damping performance of the support system are comprehensively considered, specifically:
Figure FDA0002387695880000021
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