TH74781A - Hollow crankshafts and manufacturing methods for them - Google Patents

Abstract

DC60 A hollow cast crankshaft for an internal combustion engine and a method of manufacturing thereof are disclosed in the present invention, which can reduce weight by removing the core, prevent bending of the core during manufacture, and prevent floating of the core during pouring of the molten metal, so as to enable accurate manufacture, provide good yield, and eliminate the need for oil hole grinding. In such a hollow cast crankshaft, the hollow portion has an elliptical cross-section at the follower and/or rod portions. Oil holes in the follower and rod portions are created by removing the core. The hollow portion also has an elliptical cross-section at the arm portion. This crankshaft is manufactured using a shaft bent in a horizontal direction and having an elliptical cross-section where the main shaft extends in a vertical direction at the follower and/or rod portions. The hollow portion and oil holes are formed in one piece by means of a cover casting method using a shaft bent in a horizontal direction and comprising a plurality of base plates extending either towards the die or vertically towards the die at the follower and/or rod portions. Summary of the Invention 20/02/2015 A hollow cast crankshaft for an internal combustion engine and a method of manufacturing thereof are disclosed in the present invention, which can reduce weight by removing the core, prevent bending of the core during manufacture, and prevent floating of the core during pouring of the molten metal, so as to enable accurate manufacture, provide good yield, and eliminate the need for oil hole grinding. In the hollow cast crankshaft, the hollow portion has an elliptical cross-section at the follower and/or rod portions. Oil holes in the follower and rod portions are created by removing the core. The hollow portion also has an elliptical cross-section at the sleeve portion. The manufacture of this crankshaft uses a shaft bent in a horizontal direction and has an elliptical cross-section where the main shaft extends in a vertical direction at the follower and/or rod portions. The hollow portion and oil holes are formed in a single piece by means of a cover casting method using a shaft bent in a horizontal direction and comprising a plurality of base plates extending either towards the die or extending vertically towards the die at the follower and/or rod portions. ---------------------------------------------------- A hollow cast crankshaft for an internal combustion engine and a method of manufacturing thereof are disclosed in the present invention, which can reduce weight by removing the core, prevent bending of the core during manufacture, and prevent floating of the core during pouring of the molten metal, so as to enable accurate manufacture, provide good yield, and eliminate the need for oil hole grinding. In such a hollow cast crankshaft, the hollow portion has an elliptical cross-section at the follower and/or rod portions. Oil holes in the follower and rod portions are created by removing the core. The hollow portion also has an elliptical cross-section at the sleeve portion. This crankshaft is manufactured by using a shaft bent in a horizontal direction and having an elliptical cross-section where the main shaft extends in a vertical direction at the follower and/or rod portions. The hollow portion and oil holes are formed in one piece by means of a cover casting method using a shaft bent in a horizontal direction and comprising a plurality of base plates extending either towards the die or extending vertically towards the die at the follower and/or rod portions.

Claims (7)

(All) claim rights which will not appear on the advertisement page: EDIT 20/02/2015 1. Hollow casting crankshaft for internal combustion engine. In which the crankshaft consists of holes The oil is in the pivot part and / or the oil hole is in the shaft part, the oil hole is created with the shaft removed. Where the cross-section of the hollow part that rotates along And / or the stem is oval. 2. Hollow casting crankshaft. For internal combustion engines The crankshaft consists of holes. The oil is in the rotating part. And / or an oil hole in the shaft that is built with the shaft removed, where the arm section has a hollow section with an elliptical cross-section. 3. Hollow casting crankshaft. As stated in Clause 1, where the arm portion has a hollow 4. A method for producing a hollow cast crankshaft or its material, where a hollow casting crankshaft will be Crankshaft, as set forth in any of Clause 1 to Clause 3 of claims And will use to bend the body of the inner core Horizontal direction Where this axis will have an oval cross-section Where the main axis extends vertically at the Revolving And / or part of the stem The part that rotates along and the shaft of the axis is in sync with the part. Rotate under and the shaft of the crankshaft, respectively. 5. Method for producing hollow casting crankshaft or its material. As stated in claim 4, where the hollow and oil holes are to be built into one piece, By casting a cover with the use of a bent rod. In the horizontal direction It consists of a portion of the base plate of a number protruding towards the mold, the part that rotates along and / or part of the stem. 6. A method for producing a hollow cast crankshaft or its material. As stated in Clause 4 or Article 5, where the hollow and oil holes are formed, they are assembled by casting a cover with a bent rod. In a horizontal direction And consists of a number of baseboards extending vertically toward The mold that rotates along And / or section of the shank 7. A method for producing a hollow cast crankshaft or its material. As stated in any of Clause 4 to 6, where the axial cross section for the crankshaft arm section Will be the cross section of the oval Where the main axis extends vertically -------------------------------------------------- 1.Hollow cast crankshaft for internal combustion engines In which the crankshaft consists of holes The oil is in the pivot part and / or the oil hole is in the shaft part, the oil hole is created with the shaft removed. Where the cross-section of the hollow part that rotates along And / or the stem part will be oval 2. Hollow casting crankshaft For internal combustion engines The crankshaft consists of holes. The oil is in the rotating part. And / or oil holes are in the stem part created with the core removed, where the arm segment has a hollow section with an oval cross-section. 3. Hollow casting crankshaft As stated in Clause 1, where the arm portion has a hollow With an oval cross-section 4.Production method of hollow cast crankshafts or their material, where hollow casting crankshafts will be Crankshaft, as set forth in any of Clause 1 to Clause 3 of claims And will use to bend the body of the inner core Horizontal direction Where this axis will have an oval cross-section Where the main axis extends vertically at the Revolving And / or part of the stem The part that rotates along and the shaft of the axis is in sync with the part. Rotate along and the shaft of the crankshaft respectively. 5.Production method of hollow casting crankshaft or its material As stated in claim 4, where the hollow and oil holes are to be built into one piece, By casting a cover with the use of a bent rod. In the horizontal direction It consists of a portion of the base plate protruding towards the mold, the part that rotates along and / or the shaft. 6.Production methods for hollowed-out crankshafts or their materials As stated in Clause 4 or Article 5, where the hollow and oil holes are formed, they are assembled by casting a cover with a bent rod. In a horizontal direction And consists of a number of baseboards extending vertically toward The mold that rotates along And / or part of the stem 7.Production method of hollow casting crankshaft or its material As specified in any of Clause 4 to 6, where the axial cross section for the crankshaft arm section Will be the cross section of the oval Where the main axis extends vertically