Abstract: An oil seal, which is provided on an outer circumference of a crankshaft to prevent leakage of two fluids such as a lubricating oil and an engine oil, includes: a first seal that seals a flywheel side; a second seal that seals an engine side; a pressure release hole provided to at least one of the first seal and the second seal so that a space surrounded by the first seal, the second seal and the crankshaft is in communication with one of the flywheel side and the engine side through the pressure release hole; and a partitioning lip provided between the first seal and the second seal to divide the space.

Abstract: An oil seal, which is provided on an outer circumference of a crankshaft to prevent leakage of two fluids such as a lubricating oil and an engine oil, includes: a first seal that seals a flywheel side; a second seal that seals an engine side; a pressure release hole provided to at least one of the first seal and the second seal so that a space surrounded by the first seal, the second seal and the crankshaft is in communication with one of the flywheel side and the engine side through the pressure release hole; and a partitioning lip provided between the first seal and the second seal to divide the space.

Abstract: A filter apparatus is composed such that a filter element is housed and held in a cylindrical housing, which has one side open, so as to separate a flow-in side and a flow-out side of a fluid from each other. A filter element is basically composed of a filter body that is made by laminating and arranging plural sheet-like filter media with a gap. The filter element is formed by shaping the filter body into a pleated shape, and retaining the pleated shape.

Abstract: An oil seal (10) includes a first seal (20) for sealing an engine (1) side and a second seal (30) for sealing a flywheel (4) side. The first seal (20) is an axial seal abutted on an inner ring (11) from the direction along the axial direction of a crank shaft (2). The second seal (30) is a radial seal abutted on the inner ring (11) from the direction along the radial direction of the crank shaft (2). A communication hole (25) is provided on the second seal (30), thereby preventing a space (40) surrounded by the first seal (20), the second seal (30) and the inner ring (11) from the occurrence of the negative pressure.

Abstract: A two liquid type oil seal 10 having a first seal 13 and a second seal 14, is provided with a communication hole 16 in the first seal 13. The communication hole 16 communicates a space 24 defined by the first and second seals 13, 14 and a crank shaft 2, with a gap 25 between an outer casing 11 and the first seal 13. Negative pressure induced in the space 24 is eliminated by sucking air from the outside through the communication hole 16 while lubrication oil having entered into the space 24 is removed from a groove 15 which is formed in the first and second seals 13, 14, thereby it is possible to restrain the first and second seals 13, 14 from being worn.

Abstract: An oil seal (10) includes a first seal (20) for sealing an engine (1) side and a second seal (30) for sealing a flywheel (4) side. The first seal (20) is an axial seal abutted on an inner ring (11) from the direction along the axial direction of a crank shaft (2). The second seal (30) is a radial seal abutted on the inner ring (11) from the direction along the radial direction of the crank shaft (2). A communication hole (25) is provided on the second seal (30), thereby preventing a space (40) surrounded by the first seal (20), the second seal (30) and the inner ring (11) from the occurrence of the negative pressure.

Abstract: A two liquid type oil seal 10 having a first seal 13 and a second seal 14, is provided with a communication hole 16 in the first seal 13. The communication hole 16 communicates a space 24 defined by the first and second seals 13, 14 and a crank shaft 2, with a gap 25 between an outer casing 11 and the first seal 13. Negative pressure induced in the space 24 is eliminated by sucking air from the outside through the communication hole 16 while lubrication oil having entered into the space 24 is removed from a groove 15 which is formed in the first and second seals 13, 14, thereby it is possible to restrain the first and second seals 13, 14 from being worn.

Abstract: A liquid seal structure has a tapered seal land provided on an outer circumference of a rotation shaft with an outer circumference on a sealing liquid side being diametrally larger than an outer circumference opposite to the liquid side, a tapered seal lip in contact with the outer circumference of the tapered seal land, and a seal lip support member for supporting the tapered seal lip. As a result, even when liquid invades into a seal surface between the tapered seal land and the tapered seal lip, the liquid moves elevationally by a centrifugal force in accordance with rotation of the rotation shaft to be returned to the sealing liquid side on account of sealing by a tapered surface. Therefore, the liquid does not leak to a gas side, so that sealability can be secured for a long time to perform stable sealing.