• Title/Summary/Keyword: 등속조인트

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Analytic Study on the Axial Forces of a Double Offset Constant Velocity Joints in Consideration of Friction Effect (마찰을 고려한 이중 오프셋 등속조인트의 축력 해석에 관한 연구)

  • Bae, Byoung-Chul
    • Transactions of the Korean Society of Automotive Engineers
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    • v.16 no.2
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    • pp.120-127
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    • 2008
  • The constant velocity joint(CVJ) used for transmitting torque to the front wheels is an important part in automotive drive system. There are several types of constant velocity joints. Typically, they are classified by fixed and plunging constant velocity joints. The axial force generated in plunging constant velocity joints influences significantly the noise, vibration and harshness. For heaps of time, many constant velocity joint markers have been studying and developing a valid method to reduce the axial force and extensive tests have been carried out on rigs. This paper presents the analysis method to predict the axial force of a double offset constant velocity joint(DOJ), a kind of plunging constant velocity joint, and the influence of ball-cage dimension tolerance on the axial force.

Study on the Design Methodology of Constant Velocity Joints for Passenger Cars using DOE (실험계획법을 활용한 승용차용 등속조인트 설계기법 연구)

  • Jeong, Chang-Hyun;Jung, Do-Hyun;Bae, Won-Rak
    • Transactions of the Korean Society of Automotive Engineers
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    • v.16 no.6
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    • pp.121-133
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    • 2008
  • We presented design methodology of constant velocity joint for passenger cars using design of experiment. On the basis of contact normal stress of internal components of constant velocity joints, we performed a sensitivity analysis of several design parameters. And then we performed robust design and optimization design process. As a result, we could find robust design and also propose the optimized design. Presented design process would be very helpful for engineers who are suffer for new constant velocity joint design.

A Convergence Study through Durability Analysis due to the Shaft Length of Automotive Constant Velocity Joint (자동차 등속 조인트 샤프트 길이에 따른 내구성 해석을 통한 융합연구)

  • Choi, Gye-Gwang;Cho, Jae-Ung
    • Journal of the Korea Convergence Society
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    • v.9 no.8
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    • pp.179-184
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    • 2018
  • The driving methods of car are front wheel drive, rear wheel drive and four wheel drive. At driving methods, constant velocity joint is the most important part at carrying out two functions for converting to the direction which the driver wants and transferring the power to wheels. At driving on the road, the impact can be applied to the parts transmitting power according to the state of road surface. In this study, each models of three constant velocity joints whose shaft length are different respectively were modelled with CATIA and the structural and fatigue analyses were carried out by using ANSYS. This study result is thought to be the useful material at designing the constant velocity joint with the durability against impact. And it is possible to be grafted onto the convergence technique at the design of constant velocity joint and show the esthetic sense.

A Study on the Performance Characteristics for Recycled Parts of C. V. Joint in the Vehicles (자동차 중고재생 등속조인트의 성능특성에 관한 연구)

  • 박인송;조휘창
    • Transactions of the Korean Society of Automotive Engineers
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    • v.10 no.4
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    • pp.192-198
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    • 2002
  • There are genuine parts, non-genuine parts and recycled parts which can be replaced for the repair of damaged parts of crashed cars. It is the recent trend in korea that recycled C. V joints are more popular than the genuine parts fur repairing crashed cars due to the cost. Performance of recycled C. V. joints as replacement parts was tested and analysed in this study. To examine the durability of the recycled parts, the replaced C. V joints after repair were tested and analysed periodically. The results were showed that basic performance of the recycled parts was normal. However ball cage was more frequently damaged than genuine parts. We concluded that a standard test for recycled parts is required to get a safe and durable parts.

Process Sequence Design in Cold Forging of Constant Velocity Joint Housing (등속조인트 하우징의 냉간단조 공정설계)

  • 이진희;강범수;김병민
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.18 no.9
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    • pp.2234-2244
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    • 1994
  • A process sequence of multi-operation cold forging for actual application in industry is designed with the rigid-plastic finite element method to form a constant velocity joint housing(CVJ housing). The material flow during the CVJ housing forming is axisymmetric until the final forging process for forming of ball grooves. This study treats the deformation as an axisymmetric case. The main objective of the process sequence design is to obtain preforms which satisfy the design criteria of near-net-shape product requiring less machining after forming. The process sequence design also investigates velocity distributions, effective strain distributions and forging loads, which are useful information in the real process design.

FE Analysis of Forging Process for Improving Tool Life in Hot Forging of CV Joint Outer Race (등속조인트 외륜 열간단조의 금형수명 향상을 위한 단조공정 유한요소해석)

  • Kim, Yohng-Jo
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.13 no.3
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    • pp.56-62
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    • 2014
  • During the hot forging process, the most common cause of tool failure is wear. Tool wear results in the gradual loss of part tolerances, after which eventually the tool must be replaced or repaired. In order to maximize the lifetimes of forging tools, it is important to investigate the wear mechanisms of these tools. In this study, the hot forging of the outer race of an automotive constant-velocity joint was analyzed by a finite element method to investigate the wear distribution, especially the amount and location of the maximum expected wear damage, using Archard's wear model, which was modified considering the forging temperature. Forging analyses were carried out after modifying blocker forging tools based on established versions. The modified blocker tools resulted in an increase in the tool life up to 31% with a finisher punch.

Research on Friction Characteristics of Constant Velocity Joint Grease (등속조인트용 그리스 마찰특성 연구)

  • Lee, Sung Uk;Bae, Dae Yoon
    • Tribology and Lubricants
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    • v.29 no.4
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    • pp.223-227
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    • 2013
  • A GAF (generated axial force) is produced at a plunging-type CVJ (constant velocity joint). A high GAF can cause vibrations in a vehicle. Grease is used to reduce friction between the roller and the track of the outer case of a CVJ. The grease performance depends on the surface conditions and operating temperature. The surface of the outer case is extremely rough and hard. In recent times, the maximum operating temperature of CVJs has crossed $140^{\circ}C$, because the exhaust line is now located close to the CVJ. In this study, we examined the friction characteristics of friction additives at $25-150^{\circ}C$ and determined an optimal formulation with a low friction coefficient. This formulation can be used to develop low-friction grease that can reduce the GAF produced at a CVJ by approximately 7-26%.

A Kinematic Analysis on Piston Rod Mechanism in Swashplate Type Hydraulic Axial Piston Motor/Pump Using Constant Velocity Joint (등속조인트를 적용한 사판식 유압 모터/점프의 로드형 피스톤에 대한 운동해석)

  • Kim K.H.;Kim S.D.;Ham Y.B.;Lee J.C.
    • Transactions of The Korea Fluid Power Systems Society
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    • v.2 no.1
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    • pp.1-8
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    • 2005
  • Recently, swash plate type hydraulic axial piston motors/pumps are being extensively used in the world, because of simple design, light weight and effective cost. Structural problem of the swash plate type motor/pump is that tilting angle of swash plate should be limited to relatively small value and lateral farce on pistons has an undesirable effect in reciprocating motion. To solve these problems, piston rod mechanism, which is commonly used in bent axis type motor/pump, is considered to be applied to the swash plate type motor/pump. In this paper, kinematic analysis was done on the piston rod mechanism. A series of formula were derived and numerical calculations were done for a set of motor parameters.

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Strength Design of Driveshafts for Passenger Cars (승용차용 구동축의 강도설계)

  • Jeong, Chang-Hyun;Jung, Do-Hyun;Bae, Won-Rak;Kim, Jin-Yong;Im, Jong-Soon
    • Transactions of the Korean Society of Automotive Engineers
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    • v.15 no.3
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    • pp.114-123
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    • 2007
  • We are going to propose equations for stable static and endurance strength design of driveshafts. It is very important to decide the contact normal stress of internal components of CV joints. We can estimate the strength, torque capacity, endurance life of CV joints from contact normal stress by presented equation in this paper. Besides it can be shown the equation for shaft design.