JPH0137259Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement of a shaft sealing device related to shaft sealing technology.

[Conventional technology]

As a type of shaft seal device conventionally used in automobile superchargers, as shown in Fig. 3, a seal ring c is fixed to a body a via a retainer b.
A structure is known in which the mating ring f is pressed against the end face of a mating ring f fitted externally on the shaft e by the elasticity of a coil spring d provided behind the mating ring f.

[Problem that the invention attempts to solve]

The above-mentioned shaft sealing device has oil o on the in-machine thrust bearing g side.
However, since the seal ring c and the mating ring f are in sliding contact with each other, a sliding torque is generated, and if this torque is large, the rotation of the supercharger is There is a problem in that the start-up characteristics are poor and the output response of the engine is adversely affected.

[Means for solving problems]

In view of the above circumstances, the purpose of the present invention is to provide a shaft sealing device that eliminates the generation of sliding torque and eliminates the above problems. A rubber-like elastic body is used on at least one of the opposing circumferential surfaces of the rotating ring and the fixed ring that are fitted into the inner periphery of the shaft hole of the body,
The two opposing circumferential surfaces are formed into a tapered shape to provide a tapered gap space whose diameter gradually increases toward the fluid to be sealed, and the circumferential surface of the rubber-like elastic body is threaded to form the gap space. The structure is such that a screw seal is provided at the top.

[Effect]

In other words, the shaft seal device of the present invention constitutes a non-contact type seal that does not generate sliding torque by using a screw seal provided in the gap space between the rotating ring and the stationary ring, and also connects the gap space to the sealed fluid side. Since it is set in a tapered shape that gradually expands in diameter toward , the sealing force is increased by utilizing the centrifugal force that accompanies the rotation of the shaft. In order to raise the pump of the threaded seal, it is necessary to set the clearance of the gap small, and there is a risk that the threaded part may come into contact with the tapered peripheral surface of the mating ring due to vibration or shaft runout. Since it is molded from an elastic material, even if contact occurs, the contact portion will wear out within a short period of time.

〔Example〕

Next, an embodiment of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 indicates the body of the above-mentioned automobile supercharger, a part of which is shown, and 2 indicates a body inserted into the shaft hole of the body 1. The shaft sealing device seals the oil o sealed in the in-machine thrust bearing 3 to prevent it from leaking to the blower 4 screwed to the shaft 2.

Reference numeral 5 denotes a rotary ring 7 which is clamped and fixed together with a collar 6 between the stepped portion 2a of the shaft 2 and the blower 4.
is a fixed ring that is fitted into the shaft hole opening step 1a of the body 1 together with the in-machine thrust bearing 3 and fixed by a snap spring 8, and an annular rubber-like elastic body 9 is adhered to the inner peripheral surface of the fixed ring 7. It is integrated. The outer circumferential surface of the rotating ring 5 and the inner circumferential surface of the rubber-like elastic body 9 of the stationary ring 7, which are arranged in parallel in the radial direction, are formed into a tapered shape that is substantially parallel to each other.
A tapered gap space 10 whose diameter gradually expands toward the in-machine thrust bearing 3 side filled with oil O is set in between, and within this space 10, a screw is machined on the inner circumferential surface of the rubber-like elastic body 9. A threaded seal 11 is provided which generates a pumping force in the direction of the arrow when the shaft 2 rotates. As described in the section of the above-mentioned operation, the shaft sealing device having the above configuration utilizes the pumping force of the screw seal 11 and the centrifugal force effect caused by setting the gap space 10 in a tapered shape to exert an excellent sealing force. In addition, since it has a non-contact seal structure, generation of rotational torque can be eliminated.

[Effect of idea]

As explained above, the shaft seal device of the present invention is capable of sealing the fluid to be sealed without generating sliding torque. It does not adversely affect the start-up characteristics or the output response of the engine, and allows these rotating devices to fully demonstrate their performance. In addition, since the threaded seal is set in a gap space whose diameter gradually expands toward the fluid to be sealed, it exhibits excellent sealing power due to its pumping action and fluid scattering due to centrifugal force. Because it is molded from a rubber-like elastic material, even if the seal comes into contact with the tapered peripheral surface of the mating ring due to vibration or shaft runout, it immediately wears out and separates again. It has excellent durability.

[Brief explanation of the drawing]

Fig. 1 is a half-cut sectional view showing the installed state of a shaft sealing device according to an embodiment of the present invention, Fig. 2 is a half-cut sectional view of a fixed ring of the coaxial sealing device, and Fig. 3 is an example of a conventional shaft sealing device. FIG. 1...Body, 2...Shaft, 3...In-machine thrust bearing, 4...Blower, 5...Rotating ring, 7...
... Fixed ring, 9 ... Rubber-like elastic body, 10 ... Gap space, 11 ... Screw seal.

Claims (1)

[Scope of utility model registration request] A rubber-like elastic material is used on at least one of the opposing circumferential surfaces of the rotating ring that is externally fitted onto the shaft and the fixed ring that is fitted into the inner periphery of the shaft hole of the body, and the opposing circumferential surfaces are tapered. A tapered gap space is formed and the diameter gradually expands toward the side of the fluid to be sealed, and a threaded seal is provided in the gap space by threading the peripheral surface of the rubber-like elastic body. Shaft sealing device.