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ÔÚ2017ÄêÒ»Ô¿¯µÄÃÀ¹ú¡¶Gear Solutions¡·ÔÓÖ¾ÖУ¬ À´×Ô¿µÃ÷˹£¨Cummins£©µÄ×ÊÉîµÄ¹¤³Ìʦ·¢±íÁËһƪÃûΪ¡°Optimizing Gear Macro and Microgeometry To Minimize Whine and Maximize Robustness for a Diesel Engine Application¡±µÄÎÄÕ¡£ÎÄÕÂÏêϸ½éÉÜÁËÈçºÎʹÓÃMASTA ÓÅ»¯³ÝÂֵĺê¹ÛºÍ΢¹Û²ÎÊý£¬ÔÚ²»ÎþÉü°²È«ÏµÊýµÄÇé¿öϽµµÍ´«µÝÎó²î£¨TE£©£¬×î´ó»¯µØ½µµÍÁ˳ÝÂÖÐ¥½Ð£¬×îС»¯µØ¸Ä±äÁË´«¶¯ÏµÍ³µÄÎȽ¡ÐÔ£¨³ÝÂÖµÄÍäÇú¡¢½Ó´¥¡¢½ººÏ¼°Î¢µãÊ´£©£¬Îª¶ÁÕßÌṩÁ˷dz£ºÃµÄ³ÝÂÖÉè¼Æ·ÖÎö¾ÑéºÍ³ÝÂÖ½µÔë·½°¸¡£ Optimizing Gear Macro and Microgeometry To Minimize Whine and Maximize Robustness for a Diesel Engine Application BY Neil McNab, Greg Mitchum & Erik Ostergaard A system approach is used to optimize the macro and micro design to minimize the transmission error while ensuring that robustness (bending, contact, scuffing, and micropitting) safety factors are not compromised. The desire for engines that provide more torque and power is driving higher loads into the gear train. At the same time, expectations for noise, vibration, and harshness (NVH) require systems that are even more refined. The gear train design engineer has several factors available to consider; some are controllable, and others are not. Given: Accessory speed ratios Engine speed range Architecture-specific shaft positions (camshaft, crankshaft, etc.) Available packaging space Free variables: Module Tooth counts Helix angle Pressure angle Idler shaft positions Lead and profile crowning Tooth width (within space constraints) Gear manufacturing techniques Gear material All of these variables must come together in a design that meets both durability and NVH targets, while produced economically. Because few of the variables are truly independent, a system approach was used to find the solution. Background The current gear train design (baseline) has a 45 toothed crank gear. This suffered audible gear whine most noticeably at low idle; 700-1,000 rpm while under low load. In the vehicle, it was audible around 1,200-1,400 rpm under light loads. Even though gear whine is significant at higher rpm, engine noise effectively masks it at this speed. #MASTA #NVH |
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2017-02-16 17:04:19, 1.69 M
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University of Bath : Digital hydraulic fluid power technologies
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