Oil seal for rotary engine
AssigneeToyota Jidosha Kogyo Kabushiki Kaisha
InventorShinji Kato
Life of this patent
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Abstract
An oil seal for a rotary engine in which a seal ring, or a seal ring and an elastic ring, is/are fitted in the interior of an annular recess provided in each side of the rotor, characterized in that the seal ring or elastic ring is placed into said annular recess with an initial radial stress so as to produce an axial force by virtue of the slant of said annular recess or the slant of the elastic ring for maintaining airtightness between the seal ring and the side housing.
Claims11
An oil seal device for a rotary engine characterized in that a rotor is provided capable of making eccentric rotation about an eccentric shaft within a rotor housing and side housing disposed covering both sides of said rotor housing, and annular recesses are provided in both side faces of said rotor so as to surround a hole through which the eccentric shaft extends, each of said recesses having a slant or bevel at its innermost end, and a radially elastic, annular seal ring supported by and having a surface in direct contact with each said slant or bevel for securing sealing between the respective sides of said rotor and the opposed faces of said side housing, at least one of said surface and said slant or bevel being arcuate, whereby after initial radial contraction or expansion each said seal ring is pressed axially against said side housing by radial movement of each said seal ring relative to its respective said slant or bevel caused by a restorative force from the initial contraction or expansion acting against the slant or bevel.
An oil seal device for a rotary engine characterized in that a rotor is provided capable of making eccentric rotation about an eccentric shaft within a rotor housing and side housing disposed covering both sides of said rotor housing, and annular recesses provided in both side faces of said rotor so as to surround a hole through which the eccentric shaft extends, each of said recesses having an elastic ring positioned on its innermost end, each elastic ring having a first slant or bevel portion, a radially elastic, annular seal ring positioned on each elastic ring for securing sealing between the respective sides of said rotor and the opposed faces of said side housing, one of each of said seal rings and the innermost ends of the corresponding recesses having a second slant or bevel portion substantially conforming, to and in direct contact with said first slant or bevel portion, at least one of said first and second slant or bevel portions being arcuate, whereby after initial radial contraction or expansion each said seal ring is pressed axially against said side housing by radial movement of each of said seal ring to one of its corresponding first and second slant or bevel portions caused by a restorative force from the initial contraction or expansion acting against one of its corresponding first and second slant or bevel portions.
A rotary engine comprising:
- a rotor housing,
- side housing for covering at least one side of said rotor housing,
- a rotor in said rotor housing for making eccentric rotation therein about an eccentric shaft,
- said rotor having at least one side face,
- an annular recess in said at least one side face of said rotor,
- said recess having therein a means defining a slanted surface,
- and a radially elastic, annular seal ring supported by and having a first surface in direct contact with the means defining a slanted surface in said recess for securing sealing between the side face of the rotor and the side housing, at least one of said first surface and said slanted surface being arcuate, whereby after initial radial contraction or expansion the radially elastic seal ring is pressed axially against said side housing by radial movement of said seal ring relative to the slanted surface caused by a restorative force from the initial contraction or expansion acting against the slanted surface.
Dependencies are inferred from the claim text.