Galleryless piston with cutout above pin bore
First Claim
1. A piston, comprising:
- an upper wall including an undercrown surface exposed from an underside of said piston,a ring belt depending from said upper wall and extending circumferentially around a center axis of said piston,a pair of pin bosses depending from said upper wall,each of said pin bosses presenting a pin bore,a pair of skirt panels depending from said ring belt and coupled to said pin bosses by struts,an inner undercrown region extending along said undercrown surface and surrounded by said skirt panels and said struts and said pin bosses,a pair of outer pockets extending along said undercrown surface,each outer pocket being surrounded by a portion of said ring belt and one of said pin bosses and said struts coupling said one pin boss to said skirt panels, andat least one cutout in at least one of said pin bosses,said at least one cutout being located above at least one of said pin bores,said at least one cutout including two inner cutouts,each one of said inner cutouts being open to said inner undercrown region,each one of said inner cutouts extending radially outwardly from said center axis to a location above one of said pin bores,each one of said inner cutouts including a concave surface located above said pin bore and facing said center axis of said piston,said undercrown surface extending radially outwardly from said center axis to an uppermost surface of each of said inner cutouts,each one of said inner cutouts including a base surface facing said undercrown surface and extending from said concave surface toward said center axis,said concave surface of each one of said inner cutouts being spaced radially from one of said outer pockets by material of said body, andeach one of said inner cutouts being completely spaced radially from one of said outer pockets by said material of said body.
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Accused Products
Abstract
A galleryless piston having a reduced weight and a reduced operating temperature is provided. The piston includes an undercrown surface exposed from an underside of the piston, a ring belt, pin bosses each presenting a pin bore, and skirt panels depending from the ring belt and coupled to the pin bosses by strut. The piston further includes an inner undercrown region extending along the undercrown surface and surrounded by the skirt panels, the struts, and the pin bosses. The piston also includes outer pockets each extending along the undercrown surface and each surrounded by a portion of the ring belt, one of the pin bosses, and the struts coupling the one pin boss to the skirt panels. Cutouts are located in the pin bosses above the pin bores to increase the area of the undercrown surface and thus allow cooling oil to remove more heat from the undercrown surface.
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Citations
17 Claims
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1. A piston, comprising:
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an upper wall including an undercrown surface exposed from an underside of said piston, a ring belt depending from said upper wall and extending circumferentially around a center axis of said piston, a pair of pin bosses depending from said upper wall, each of said pin bosses presenting a pin bore, a pair of skirt panels depending from said ring belt and coupled to said pin bosses by struts, an inner undercrown region extending along said undercrown surface and surrounded by said skirt panels and said struts and said pin bosses, a pair of outer pockets extending along said undercrown surface, each outer pocket being surrounded by a portion of said ring belt and one of said pin bosses and said struts coupling said one pin boss to said skirt panels, and at least one cutout in at least one of said pin bosses, said at least one cutout being located above at least one of said pin bores, said at least one cutout including two inner cutouts, each one of said inner cutouts being open to said inner undercrown region, each one of said inner cutouts extending radially outwardly from said center axis to a location above one of said pin bores, each one of said inner cutouts including a concave surface located above said pin bore and facing said center axis of said piston, said undercrown surface extending radially outwardly from said center axis to an uppermost surface of each of said inner cutouts, each one of said inner cutouts including a base surface facing said undercrown surface and extending from said concave surface toward said center axis, said concave surface of each one of said inner cutouts being spaced radially from one of said outer pockets by material of said body, and each one of said inner cutouts being completely spaced radially from one of said outer pockets by said material of said body. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of manufacturing a piston, comprising the steps of:
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providing a body including an upper wall, the upper wall including an undercrown surface exposed from an underside of the piston, a ring belt depending from the upper wall and extending circumferentially around a center axis of the piston, a pair of pin bosses depending from the upper wall, each of the pin bosses presenting a pin bore, a pair of skirt panels depending from the ring belt and coupled to the pin bosses by struts, an inner undercrown region extending along the undercrown surface and surrounded by the skirt panels and the struts and the pin bosses, a pair of outer pockets extending along the undercrown surface, each outer pocket being surrounded by a portion of the ring belt and one of the pin bosses and the struts coupling the one pin boss to the skirt panels, and forming at least one cutout in at least one of the pin bosses above at least one of the pin bores, the at least one cutout including two inner cutouts, each one of the inner cutouts being open to the inner undercrown region, each one of the inner cutouts extending radially outwardly from the center axis to a location above one of the pin bores, each one of the inner cutouts including a concave surface located above the pin bore and facing the center axis of the piston, the undercrown surface extending radially outwardly from the center axis to an uppermost surface of each of the inner cutouts, each one of the inner cutouts including a base surface facing the undercrown surface and extending from the concave surface toward the center axis, the concave surface of each one of the inner cutouts being spaced radially from one of the outer pockets by material of the body, and each one of the inner cutouts being completely spaced radially from one of the outer pockets by the material of the body. - View Dependent Claims (17)
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Specification