HPF 1.2 NEW INTERCONNECTION SYSTEM FOR EXTREME VIBRATION REQUIREMENTS IN THE VEHICLE
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1 HPF 1.2 NEW INTERCONNECTION SYSTEM FOR EXTREME VIBRATION REQUIREMENTS IN THE VEHICLE Authors: Stefan Glaser Senior Manager Customer Engineering VWA Waldemar Stabroth Director Technical Marketing Contact: Thorsten Eisele Product Manager EMEA Svenja Kunz Product Manager EMEA Phone +49 (0) TE AUTOMOTIVE /// White Paper HPF 1.2 Interconnection System
2 HPF 1.2 NEW INTERCONNECTION SYSTEM FOR EXTREME VIBRATION REQUIREMENTS IN THE VEHICLE THE EVOLUTION OF MODERN HIGH-PERFORMANCE COMBUSTION ENGINES HAS BEEN CREATING NEW LEVELS OF REQUIREMENTS FOR INTERCONNECTION SYSTEMS. TRADITIONAL ELECTRICAL CONNECTOR SYSTEMS WITH A PROVEN TRACK RECORD OVER MANY YEARS HAVE TO PERFORM WITH THE STRONGLY INCREASED VIBRATION IN THE HARSH ENVIRONMENT OF TODAY S VEHICLES. This applies on the one hand to applications in high-performance engines with between eight and ten cylinders, but also to lightweight low-displacement ultra-efficient engines. Therefore, car manufacturers specifications for vibration loads as defined in test specifications for electrical connection systems are no longer sufficient. Currently, measured vibration loads can be greater by a factor up to four. TE Connectivity (hereinafter: TE) has addressed this challenge by developing the new contact system HPF 1.2. In conjunction with a selection of optimized connector housings, this system is capable of withstanding the increased vibration requirements. This white paper reports on the innovations of the HPF 1.2 terminal system and the associated connector system plus its mode of operation. TE AUTOMOTIVE /// White Paper HPF 1.2 Interconnection System 2
3 CONTENTS 1 Introduction 4 Damage Mechanism caused by Vibration 4 2 The new HPF 1.2 Interconnection System 5 Structural Design of the Interconnection System 5 Connector Housing and Interface Compatibility 6 Test Results 7 3 Conclusion 9 TE AUTOMOTIVE /// White Paper HPF 1.2 Interconnection System 3
4 1 INTRODUCTION 1.2 mm contact systems such as TE s MCON 1.2 connector series on a two and three-way AK interface have become an established interface used for contacts to engine components (such as actuators, sensors and injection valves). Originally, this type of connector system was designed for loads of 30 g Sinus and has guaranteed reliable operations for many years. However, the reality in today s cars is a multitude of load on actual connections. Test measurements undertaken with the relevant engines in cooperation with the car manufacturers clearly indicated that the actual vibration profiles of the tested engines in operation exceeded the specified values by a wide margin. The tests indicated excitation levels of up to 80 g Sinus, over a widely distributed frequency range of between 200 Hz and 2000 Hz, depending on the engine type. This result means that the current spectrum of measured vibration load levels is higher than previously assumed by a factor of up to four, Fig. 1. TE has developed a new and innovative connector system to meet these strongly increased requirements. It was evident that it would not be possible to manage a leap of this magnitude in the vibration load by using an incremental optimization of an existing terminal or connector system. Fig. 1: Currently measured vibration profile compared to previously applicable qualification requirements TE AUTOMOTIVE /// White Paper HPF 1.2 Interconnection System 4
5 2 THE NEW HPF 1.2 INTERCONNECTION SYSTEM The aim of the development of the new connector system was firstly to achieve interface compatibility with the MCON 1.2 connector system, and secondly, of course, to create a design capable of withstanding high vibrations, as described in section one. The existing HPF 1.5 connector system for flat tab contacts was used as the starting point for development. A characteristic typical of HPF contact systems compared to other contact systems is the higher contact normal force, which is applied to the contact zone between the solid tab contact and the spring loaded receptacle contact. This increased contact normal force is used analogue for the new HPF 1.2 contact design. The HPF 1.2 is an optimized design of the HPF predecessor version. The HPF 1.2 contact system is designed for tabs with the dimensions 1.2 mm x 0.6 mm. Given the outlined damage mechanism under high levels of vibration, the primary aim of the design was to avoid micro-movements in the contact zone between the tab and the HPF 1.2. To achieve this, the contact zone was mechanically decoupled from the remaining contact system in a way that the micro movements introduced by vibrational load were removed from the contact point of contact. Structural Design The core characteristic of the new HPF 1.2 contact system is its special structure. The contact comprises two parts: the outer closed-box contact spring (shown yellow in the illustration) and the inner contact body (shown in light grey), Fig. 2. Isolation Crimp Wire Crimp Primary Lock Coding Secondary Lock Fig. 2: Contact body and spring of the HPF 1.2 TE AUTOMOTIVE /// White Paper HPF 1.2 Interconnection System 5
6 The corrugated contact springs generate several contact zones positioned one behind the other to stabilize the position of the tab relative to the HPF 1.2. The crimp-type connection is designed for contacting cables with cross-sections ranging between 0.35 mm 2 and 1 mm 2. The HPF 1.2 with Ag plating can be used for ambient temperatures of up to 150 C. Other surface finishes for higher temperatures are currently in the process of qualification. The added meander-shaped geometry compensates micro movements introduced in the axial direction through the cable ( concertina effect ). The external box spring ensures low-friction guidance of the contact body and fixes the HPF 1.2 contact in the contact chamber of the connector housing. This flexural fatigue stress in the contact body must be retained reliably in the elastic area of the copper material used in order to safeguard the desired mechanical endurance strength in the meander geometry. To achieve this endurance strength, the maximum admissible movement of the meander zone is limited by the design. Connector Housing and Interface Compatibility Given the high vibration loads of up to 80 g at 2000 Hz, this innovative contact design would not be sufficient on its own to fulfil the requirements. This calls for an optimized electrical connector concept designed as an overall system. To ensure that the HPF 1.2 connector system can be used with existing components, the system is designed to be interface compatible with the VDA 1.2 interface. Fig. 3 shows the structure of the new housing using the example of a 2-position interface. Wire Fixation Silicon Ring CPA Housing Radial Seal Secondary Lock Contact Housing Fig. 3: The HPF 1.2 contact and its connector housing form a fully aligned system In order for the decoupling of the contact zone from the introduced movements realized in the HPF 1.2 to have optimum effect, the housing has been adapted to the contact in a number of ways. These include accuracy of fit in the contact cavity, the radial seal, and the cable fixture in order to prevent relative movements in the contact points. The housing material with its good damping properties also contributes towards the overall performance of the connector system. TE AUTOMOTIVE /// White Paper HPF 1.2 Interconnection System 6
7 Test Results At our Test Competence Center in Bensheim, Germany, TE is able to draw on leading edge facilities for vibration testing to validate the connector components. Overall, the vibration resistance of the HPF 1.2 connector system is four times higher than most stringent vibration requirements specified today. Fig. 4 provides an example of one of the many successfully tested vibration profiles, carried out on the HPF 1.2. Fig. 4: Vibration profile with cyclical temperature changes successfully passed by the HPF 1.2 connector system TE AUTOMOTIVE /// White Paper HPF 1.2 Interconnection System 7
8 To assess the contact quality, the contact resistance was measured during vibration testing. Fig. 5 indicates stable electrical values during and after testing. Alongside examination of the electrical values, another key assessment criterion is evaluation of the contact surface after the end of testing. Fig. 6 shows minimal surface wear, with surfaces still having full functional integrity after the end of testing, Fig. 7. Another finding to be noted is that for applications subject to the described vibration loads, suitable cables must be used without fail (highly flexible fine stranded wires) in order to avoid cable breakages. Fig. 5: Contact resistance before and after the test sequence defined in Fig. 4 Fig. 6: Scanning electron microscope image to assess contact surfaces of tab and receptacle contact after the same test. No damage has occurred. Fig. 7: Enlarged detail of the two contact points from Fig. 6 TE AUTOMOTIVE /// White Paper HPF 1.2 Interconnection System 8
9 3 CONCLUSION In efficient and high-performance engines, it is primarily the relative movements at the contact zone caused by vibration that bring today s connector systems to the limits of their performance. To meet this challenge, TE offers an innovative solution to uncouple the micro movements between the contact point and the cable. Because the terminal itself is only one part of the connector system, the overall system comprising the housing, cable fixture and contact system has been optimized for extremely high vibration loads of up to 80 g Sinus at up to 2000 Hz. To develop contact systems optimized for the respective application, complex contact physics calculations involving the layer structure are required. For this, TE Connectivity uses an internally developed and validated software program which reliably indicates both the mechanical and electrical parameters. TE AUTOMOTIVE /// White Paper HPF 1.2 Interconnection System 9
10 ABOUT TE CONNECTIVITY TE Connectivity (NYSE: TEL) is a $12 billion global technology leader. Our connectivity and sensor solutions are essential in today s increasingly connected world. We collaborate with engineers to transform their concepts into creations redefining what s possible using intelligent, efficient and high-performing TE products and solutions proven in harsh environments. Our 72,000 people, including 7,200 design engineers, partner with customers in close to 150 countries across a wide range of industries. We believe EVERY CONNECTION COUNTS TE Connectivity Germany GmbH Ampèrestrasse Bensheim Germany TE Connectivity. All rights reserved. TE Connectivity, TE, TE connectivity (logo), and MCON are trademarks. Other logos, product and company names mentioned herein may be trademarks of their respective owners. DISCLAIMER While TE Connectivity (TE) has made every reasonable effort to ensure the accuracy of the information in this white paper, TE does not guarantee that it is error-free, nor does TE make any other representation, warranty or guarantee that the information is accurate, correct, reliable or current. TE reserves the right to make any adjustments to the information contained herein at any time without notice. TE expressly disclaims all implied warranties regarding the information contained herein, including, but not limited to, any implied warranties of merchantability or fitness for a particular purpose. The dimensions in this white paper are for reference purposes only and are subject to change without notice. Specifications are subject to change without notice. Consult TE for the latest dimensions and design specifications. TE AUTOMOTIVE /// White Paper HPF 1.2 Interconnection System
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