Shaft sealing assembly
AssigneeKabushiki Kaisha Toyota Jidoshokki
InventorsMasami Osako, Takeshi Yamada, Masakazu Murase
Life of this patent
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Abstract
A shaft sealing assembly seals a rotary shaft of a refrigerant compressor with a first sealing member, which is a lip seal. The first sealing member has a hollow portion. As the pressure in the interior space of the compressor housing increases, an outer wall surrounding the hollow portion is elastically deformed. Accordingly, a lip portion of the first sealing member receives a tension that weakens a force pressing the lip portion against the rotary shaft. Therefore, the sealing assembly improves the durability of the lip portion and maintains a satisfactory property of the lip portion to follow displacement of the rotary shaft at the same time.
Claims19
A shaft sealing assembly for a machine that includes an interior space and a shaft extending from the interior space to the outside, wherein the shaft sealing assembly is provided about the shaft to seal the interior space from the outside, the shaft sealing assembly comprising:
- a lip seal having an annular lip portion that contacts the circumference of the shaft;
- and
- an outer wall provided on the lip seal, wherein the outer wall defines a hollow portion in the lip seal and encompasses the hollow portion, the outer wall being coupled to the lip portion, wherein the outer wall is elastically deformed in accordance with an increase of the pressure in the interior space, thereby applying a tension to the lip portion, the tension acting in a direction to weaken a pressing force of the lip portion applied to the shaft.
A shaft sealing assembly for a machine that includes a housing defining an interior space and a shaft extending from the interior space to the outside, wherein the shaft sealing assembly comprises an annular lip seal, wherein the lip seal is provided about the shaft to seal the interior space from the outside, wherein the lip seal includes:
- a main body fixed to the housing;
- an annular lip portion that extends radially inward from the main body and contacts the circumference of the shaft, wherein the pressure in the interior space presses the lip portion against the circumference of the shaft;
- and
- an annular wall portion coupling the main body to the lip portion, wherein the main body, the lip portion, and the wall portion define a hollow portion in the lip seal, wherein the wall portion is elastically deformed in accordance with an increase of the pressure in the interior space, thereby applying a radially outward force to the lip portion.
A shaft sealing assembly for a compressor for compressing refrigerant in a refrigeration circuit, wherein the compressor includes a housing defining an interior space and a rotary shaft extending from the interior space to the outside, wherein the shaft sealing assembly comprises an annular lip seal, wherein the lip seal is provided about the rotary shaft to seal the interior space from the outside, wherein the lip seal includes:
- a main body fixed to the housing;
- an annular lip portion that extends radially inward from the main body and contacts the circumference of the rotary shaft, wherein the pressure in the interior space presses the lip portion against the circumference of the rotary shaft;
- and
- an annular wall portion coupling the main body to the lip portion, wherein the main body, the lip portion, and the wall portion define a hollow portion in the lip seal, wherein the wall portion is elastically deformed in accordance with an increase of the pressure in the interior space, thereby applying a radially outward force to the lip portion.
Dependencies are inferred from the claim text.