公开(公告)号：US06350396B1

公开(公告)日：2002-02-26

申请号：US09108560

申请日：1998-07-01

Applicant: Venkatesh Chellappa

Inventor： Venkatesh Chellappa

IPC: C01B3100

CPC classification number: C04B35/62844 ,  C04B35/62873 ,  C04B35/83 ,  C04B2235/48 ,  C04B2235/5248 ,  C04B2235/6021 ,  F02F3/0084 ,  F05C2231/00

Abstract: A method of making carbon-carbon pistons and a limited variety of other products also requiring light weight, high strength and high thermal conductivity, and the resulting piston, including the steps of feeding impregnated fibers from spools into a layered bundle of fibers, coating the fibers with a carbonaceous material to form a preform, sleeving the preform with a thermoplastic sleeve, extruding the coated preform, passing the preform through an oven while compacting the preform further, and cutting the preform into standard lengths as the preform exits the furnace and achieves a degree of cool down. The pistons are machined from the cut preforms with the piston axis parallel to the fibers and layers. The pistons include crown, skirt, and wrist pin bosses and the axis of the wrist pin bosses is perpendicular to the fibers and layers.

Abstract translation: 制造碳碳活塞的方法以及还需要重量轻，高强度和高导热性的有限种类的其他产品，以及所产生的活塞，包括以下步骤：将来自线轴的浸渍纤维进入层状纤维束， 具有碳质材料以形成预成型件的纤维，用热塑性套筒套住预成型件，挤出涂覆的预制件，使预成型坯通过烘箱进一步压实预制件，并且在预成型件离开炉子时将预成型坯切割成标准长度，并实现 一度冷静下来。 活塞从切割的预制件加工，活塞轴线平行于纤维和层。 活塞包括表冠，裙部和腕针凸起，并且手腕销凸起的轴线垂直于纤维和层。

公开(公告)号：US6029346A

公开(公告)日：2000-02-29

申请号：US70325

申请日：1998-04-30

Applicant: Venkatesh Chellappa

Inventor： Venkatesh Chellappa

IPC: C04B35/83 ,  F02F3/00 ,  C04B33/32

CPC classification number: F02F3/0023 ,  C04B35/83 ,  F05C2201/021 ,  F05C2201/0448 ,  F05C2203/0808 ,  F05C2251/042 ,  Y10T29/49249 ,  Y10T29/49259 ,  Y10T29/49261

Abstract: An internal combustion engine component assembly including piston, wrist pin, and cylinder sleeve, all constructed of a matching carbon--carbon composite is disclosed. The piston is a two-piece assembly divided in crown and skirt, each fabricated individually to optimize the most desirable properties in the respective cylinder areas in which they operate. The crown is fabricated by placing the fiber and binder into a compression mold and pyrolizing(heating) the resulting preform at a high temperature in the range of 1500 to 2000 degrees C. to achieve high temperature strength, and high thermal conductivity that continue after machining to the finished crown part. The skirt, a separate piece, on the other hand is fabricated differently to seek higher lubricity and better wear resistance along the cylinder wall with lower thermal conductivity to minimize heat loss. The skirt preform is fabricated by wrapping the fiber around a mandrel and subsequently heating and pyrolizing at temperatures far less than the heat treatment temperature of the crown preform resulting in significant time and cost saving. The skirt precursor is machined and then assembled to the crown to complete the piston. The piston skirt, the wrist pin and the cylinder sleeve are also fabricated using similar composition matching techniques to minimize tolerances between these parts. All three of these parts are separately preformed on mandrels utilizing the same wrapping angles to equate wrap strength. Then, the resulting preforms of each are preheated and pyrolized at the same temperatures to almost similar elevated temperature strength and, most importantly, coefficients of thermal expansion. This technique permits the engine designer to reduce the clearance between these parts, thereby minimize blow by, reduce lubrication requirements, and increase engine horsepower.

Abstract translation: 公开了一种包括活塞，腕针和气缸套的内燃机部件组件，全部由匹配的碳 - 碳复合材料构成。 活塞是分为冠和裙部的两件式组件，每个组件分别制造成优化其操作的相应气缸区域中最理想的性能。 通过将纤维和粘合剂放置在压模中并在1500-2000℃的高温下热处理（加热）所得预成型件来制造表冠，以实现高温强度和加工后继续的高热导率 到成品冠部分。 另一方面，裙子是单独的，以不同的方式制造，以便沿着汽缸壁获得更高的润滑性和更好的耐磨性，并具有较低的热导率以最小化热损失。 通过将纤维缠绕在心轴上并随后在远远低于冠状预制件的热处理温度的温度下加热和热解来制造裙部预制件，从而节省了大量的时间和成本。 裙边前体被加工，然后组装到冠部以完成活塞。 活塞裙，腕针和气缸套也使用类似的组合匹配技术制造，以最小化这些部件之间的公差。 这些部件中的所有三个都使用相同的缠绕角度分别在心轴上预成型以等于包裹强度。 然后，将所得到的预成型件在相同温度下预热和热解至几乎相似的升高的温度强度，最重要的是热膨胀系数。 这种技术允许发动机设计者减少这些部件之间的间隙，从而最大限度地减少打击，减少润滑要求并提高发动机功率。

公开(公告)号：US06216585B1

公开(公告)日：2001-04-17

申请号：US09440844

申请日：1999-11-16

Applicant: Venkatesh Chellappa

Inventor： Venkatesh Chellappa

IPC: F16J104

CPC classification number: F02F3/0023 ,  C04B35/83 ,  F05C2201/021 ,  F05C2201/0448 ,  F05C2203/0808 ,  F05C2251/042 ,  Y10T29/49249 ,  Y10T29/49259 ,  Y10T29/49261

Abstract: An internal combustion engine component assembly including piston, wrist pin, and cylinder sleeve, all constructed of a matching carbon-carbon composite is disclosed. The piston is a two-piece assembly divided in crown and skirt, each fabricated individually to optimize the most desirable properties in the respective cylinder areas in which they operate. The crown is fabricated by placing the fiber and binder into a compression mold and pyrolizing(heating) the resulting preform at a high temperature in the range of 1500 to 2000 degrees C. to achieve high temperature strength, and high thermal conductivity that continue after machining to the finished crown part. The skirt, a separate piece, on the other hand is fabricated differently to seek higher lubricity and better wear resistance along the cylinder wall with lower thermal conductivity to minimize heat loss. The skirt preform is fabricated by wrapping the fiber around a mandrel and subsequently heating and pyrolizing at temperatures far less than the heat treatment temperature of the crown preform resulting in significant time and cost saving. The skirt precursor is machined and then assembled to the crown to complete the piston. The piston skirt, the wrist pin and the cylinder sleeve are also fabricated using similar composition matching techniques to minimize tolerances between these parts. All three of these parts are separately preformed on mandrels utilizing the same wrapping angles to equate wrap strength. Then, the resulting preforms of each are preheated and pyrolized at the same temperatures to almost similar elevated temperature strength and, most importantly, coefficients of thermal expansion. This technique permits the engine designer to reduce the clearance between these parts, thereby minimize blow by, reduce lubrication requirements, and increase engine horsepower.

Abstract translation: 公开了一种包括活塞，腕针和气缸套的内燃机部件组件，全部由匹配的碳 - 碳复合材料构成。 活塞是分为冠和裙部的两件式组件，每个组件分别制造成优化其操作的相应气缸区域中最理想的性能。 通过将纤维和粘合剂放置在压模中并在1500-2000℃的高温下热处理（加热）所得预成型件来制造表冠，以实现高温强度和加工后继续的高热导率 到成品冠部分。 另一方面，裙子是单独的，以不同的方式制造，以便沿着汽缸壁获得更高的润滑性和更好的耐磨性，并具有较低的热导率以最小化热损失。 通过将纤维缠绕在心轴上并随后在远远低于冠状预制件的热处理温度的温度下加热和热解来制造裙部预制件，从而节省了大量的时间和成本。 裙边前体被加工，然后组装到冠部以完成活塞。 活塞裙，腕针和气缸套也使用类似的组合匹配技术制造，以最小化这些部件之间的公差。 这些部件中的所有三个都使用相同的缠绕角度分别在心轴上预成型以等于包裹强度。 然后，将所得到的预成型件在相同温度下预热和热解至几乎相似的升高的温度强度，最重要的是热膨胀系数。 这种技术允许发动机设计者减少这些部件之间的间隙，从而最大限度地减少打击，减少润滑要求并提高发动机功率。