Nok Corporation

Shigeyuki Ono

Osamu Kobayashi

Hideyuki Tokumitsu

Takashi Ohta

Hironori Minagawa

Takashi Shimazu

Yuya Sakano

Takumi Yamada

Yoshiaki Sugiura

To suppress static leakage in a seal device, a seal lip is configured for sliding contact with a seal flange that includes a thread groove exerting a fluid pumping action at a time of shaft rotation. The seal device prevents sealing fluid on the inner-machine side from leaking to the outer-machine side between a housing and a rotating shaft inserted into a shaft hole on the housing. The seal lip is attached to the inner periphery of the shaft hole and the seal flange is attached to the outer periphery of the rotating shaft. A sliding area in the seal flange in sliding contact with the seal lip is a flat surface with no thread grooves, and has an outer peripheral side area and an inner peripheral side area, which each have a thread groove exerting a fluid pumping action when the rotating shaft rotates.

Seal device

In a universal joint boot including a bellows part, a ring-shaped mounting part that is formed at one end of the bellows part and into which a cup for receiving one member of two members moving relatively to each other is inserted; and a seal that is formed toward the peripheral direction of the inner peripheral surface of the mounting part to which the cup is mounted, the inner peripheral surface has protrusions protruding toward the axial center of the ring-shaped mounting part and the height of the seal lip becomes lower from the bottom of the protrusion to a peak and width of the seal lip becomes wider from the bottom of the protrusion to the peak, whereby sealing performance can be improved.

Boot for universal joint

A universal joint boot having a boot body including a bellows part and an opening portion which is formed in one end of the bellows part and into which a case for receiving one member of two members moving relatively to each other is inserted. An annular adaptor is mounted on the inner peripheral surface of the opening portion and has an outer peripheral surface formed nearly in the same shape as the inner peripheral surface. The adaptor has a fixing portion that is pressed by the inner peripheral surface of the opening portion of the boot body, thereby being fixed to the case. A reversing portion is located opposite to the fixing portion with the opening portion between them and sandwiches the opening portion together with the fixing portion. A folding portion is located where the reversing portion is folded back to the outside. Hence, the universal joint boot can be easily assembled.

Universal joint boot

An object of the present invention is to provide a molding composition having an excellent properties to seal carbon dioxide. The composition is made of fluoro thermoplastic elastomer having a reinforcing filler such as carbon black or white carbon having a particle diameter of not more than 100 nm. The composition can be used as a sealing materials such as O-ring, oil seal, gasket, hose, tube or diaphragm for sealing carbon dioxide.

Growing community of inventors

Ogasa-gun, Japan

Shigeyuki Ono