-
.jpg)
Theoretical Study of the Load Distribution on the Threads for Roller Screw Mechanisms of a Friction Type（16年摩擦型滾柱絲杠螺紋載荷分布的理論研究）
t
The paper provides theoretical research of load distribution across the thread turns of the planetary roller-screw mechanism
(RSM). A characteristic feature of the theoretical approach of the paper is the use of a RSM rod model with two elastic contact
layers (the first layer is composed of screw-rollers, the second – of nut-rollers). A threaded mating of each elastic layer is
considered as a connection with continuous turns, which is closest to the truth and consistent to classical approaches. A similar
approach was applied for the ball-and-screw mechanisms with a member point contact. Thus, differential analytical closed-form
equations may be used to solve this task.
Based on the initial equation of compatibility of strains, axial offsets of contact layer points and the sum of screw, roller and nut
turn deflections are calculated; then, load distribution across the turns may be determined. Load distribution depends both on the
RSM geometry (pitch, profile angle, entry number, and thread diameter), material of threaded elements, manufacturing accuracy,
and on mating friction forces. With the dependencies of load distribution across the turns of zero-clearance RSMs obtained, we
have determined that maximum load is imposed on the outermost turns, which corresponds to classical solutions proposed by N.
E. Zhukovski.
閱讀：
2016-07-15
-
.jpg)
Static Load Distribution and Axial Stiffness in a Planetary Roller Screw Mechanism（16年行星滾柱絲杠的靜載荷分布和軸向剛度）
In this paper, an original approach is proposed to calculate the static load distribution
and the axial stiffness of a planetary roller screw (PRS) mechanism. Assuming that the
external loading is shared equally over an arbitrary number of rollers, only a sector of
the system is represented to save on computing time. The approach consists in using a
structure of bars, beams, and nonlinear springs to model the different components of the
mechanism and their interactions. This nonlinear model describes the details of the mechanism and captures the shape of the nut as well as the bending deformation of the roller.
All materials are assumed to operate in the elastic range. The load distribution and the
axial stiffness are determined in three specific configurations of the system for both compressive and tensile loads. Further, the influence of the shape of the nut is studied in the
case of the inverted PRS. The results obtained from this approach are also compared to
those computed with a three-dimensional finite-element (3D FE) model. Finally, since the
calculations appear to be very accurate, a parametric study is conducted to show the
impact of the bending of the roller on the load distribution.
閱讀：
2016-01-12
-
.jpg)
Load distribution of planetary roller screw mechanism and its improvement approach（15年行星滾柱絲杠的載荷分布）
A model of load distribution over threads of planetary roller screw mechanism (PRSM) is developed according to the
relationships of deformation compatibility and force equilibrium. In order to make the applied load of PRSM uniformly
distributed over threads, an improvement approach is proposed, in which the parameters of thread form of roller and
nut are redesigned, and the contact conditions of roller with screw and nut are changed to compensate the axial
accumulative deformation of shaft sections of screw and nut. A typical planetary roller screw mechanism is taken as
example to analyze the load distribution, and the effects of installation configurations, load conditions and thread form
parameters on load distribution are studied. Furthermore, the improvement approach is applied to the PRSM, and it is
proved to be beneficial to reach uniform load distribution over threads.
閱讀：
2015-09-01
-
.jpg)
Kinematics Analysis of the Roller Screw Based on the Accuracy of Meshing Point Calculation（15年滾柱絲杠基于嚙合點精度計算的運動學分析）
This paper investigates the meshing behavior of the roller screw, a mechanical transmission device characterized by threaded rollers
that transfer a load between the nut and the screw, by analyzing the meshing characteristics between screw and rollers. This study
seeks to establish a more accurate mathematical model for the thread surface by creating a modeling process in which the max
radiuses of the threads are calculated more precisely. The contact line distribution and the contact location were also calculated in
order to confirm the cross section of the meshing points. In the research presented in this paper, the actual transmission ratio is
analyzed and the study results in a new method to calculate the actual transmission ratio. In this study, the helical angle and the
vertex angle are proven to be of great significance after a careful analysis of their influence is conducted.
閱讀：
2015-03-25
-
.jpg)
Experimental simulation of rolling–sliding contact for application to planetary roller screw mechanism（15年滾動滑動接觸的實驗模擬及其應用）
The planetary roller screw mechanism is used in the aeronautics industry for electro-mechanical
actuators application. It transforms a rotational movement into a translation movement, and it is
designed for heavy loads. The main components are made of martensitic stainless steel, and lubricated
with grease. Like most usual rolling mechanisms, smearing and jamming can occur before the
theoretical fatigue lifetime, especially in defective lubrication conditions.
The actuated load is carried by small contacts between the threads of the screw, the rollers and the
nut. The static single contact can be described as an ellipsoid on flat contact; motion consists of rolling
with sliding perpendicular to the rolling direction. A calculation method based on elastic theories (Hertz,
Carter, Johnson) has been implemented. It calculates the normal and tangential stresses distributions,
generated in the micro-slip and stick zones of the contact area, using several input parameters such as
material properties, normal force, and creep ratio.
A specific apparatus has been developed to support these calculations and to experimentally study
the damage of the contacts in this mechanism. It consists of a freely rolling wheel loaded on a rotating
disc with a component of sliding that simulates the roller screw contact. The tribometer inputs are the
normal load, the speed, the creep ratio, and the lubrication. The wheel rolling speed and the tangential
force generated in the direction perpendicular to rolling are measured.
The experiments reveal a quick adhesive wear in dry or bad lubricated conditions, while a low
friction coefficient remains if the contact is well lubricated. The influence of the input parameters
concurs with the theoretical calculation. The evolution of grease lubrication during duty lifetime and the
influence of the tribo-chemical films on this lifetime are also studied.
閱讀：
2015-03-19
主站蜘蛛池模板：
综合五月婷婷
|
久久精品亚洲成在人线av麻豆
|
在线 | 麻豆国产传媒61国产免费
|
亚洲精品欧美日韩
|
天天天色|
亚洲精品尤物
|
疯狂做受xxxx欧美肥白少妇
|
亚洲网友自拍
|
精品成人av一区二区三区
|
日韩亚洲第一页
|
亚洲制服丝袜中文字幕在线
|
成人精品av
|
少妇裸体长淫交视频免费观看
|
大胸少妇午夜三级
|
一区二区三区四区在线播放
|
91久久久久久久国产欧美日韩-
|
99精品欧美
|
精品国产乱码久久久久夜深人妻
|
无码全黄毛片免费看
|
日本亚洲精品一区二区三
|
国产精品久久久久无码人妻
|
欲色av
|
99久e在线精品视频在线
|
爱情岛亚洲论坛入口
|
无码人妻一区二区三区av
|
很污很黄的网站
|
国产区精品一区二区不卡中文
|
黄色av网站免费在线观看
|
av片在线观看网站
|
国产精品免费一区二区区
|
jizzzz成熟丰满韩国女视频
|
欧美激情性做爰免费视频
|
亚洲第一成人网站
|
日韩精品一卡2卡3卡4卡新区
|
欧美精品亚洲精品日韩精品
|
亚洲制服无码
|
色xxxxxx
|
久久精品一区视频
|
久久综合久久爱香蕉网
|
男女激情在线观看
|
国产亚洲黄色片
|
色综合999|
午夜激情av
|
国产成人综合亚洲亚洲国产第一页
|
48沈阳熟女高潮嗷嗷叫
|
男人的天堂毛片
|
国产在线观看免费视频今夜
|
国产亚州精品女人久久久久久
|
国产精品爱久久久久久久电影
|
视频在线不卡
|
日韩中字在线
|
亚洲综合网站精品一区二区
|
无码制服丝袜人妻在线视频精品
|
丝袜 亚洲 另类 欧美 变态
|
久久国产精品久久久久久电车
|
国产亚洲日韩在线播放更多
|
国产黄色大片网站
|
91精品久久久久久久久
|
男女做爽爽爽视频免费软件
|
99久久久久国产精品免费
|
国模大尺度自拍
|
亚洲国产精品一区二区成人片国内
|
无码av最新无码av专区
|
天天澡日日澡狠狠欧美老妇
|
天使萌一区二区三区免费观看
|
欧美偷拍第一页
|
国产99视频精品专区
|
国产成人久久久精品二区三区
|
色婷婷香蕉在线一区
|
欧美一二级
|
国产成人亚洲精品另类动态
|
91插插插插插插插
|
亚洲欧美成人中文日韩电影网站
|
午夜私人影院
|
黄色在线观看免费视频
|
国产精品免费久久久久软件
|
国产成人18黄网站免费观看
|
国产无套粉嫩白浆内谢在a
色噜噜狠狠狠狠色综合久一
|
日韩毛片免费无码无毒视频观看
|
日本高清视频一区二区三区
|
国色天香社区在线视频观看
|
亚洲精品国产精品国产自2022
|
日韩国产第一页
|
丰满少妇高潮久久三区
|
男女又爽又黄激情免费视频大
|
亚洲国产精品国自产拍av
|
美女隐私黄www网站免
|
夜夜草|
成人wxx视频免费
|
亚洲一区二区三区视频在线
|
精品日韩亚洲欧美高清a
|
热99re久久精品天堂
|
黄色a级免费
|
五月婷婷久久草丁香
|
欧美日韩精品一区二区在线视频
|
久久水蜜桃
|
久久久久久久久久影院
|
免费精品国自产拍在线播放
|
精品国产va久久久久久久
|
