Nok Corporation

Eagle Industry Co., Ltd.

Norimasa Hosonuma

Fangman Xu

Nozomu Suzuki

Satoshi Yamanaka

Maiko Kawamoto

Shigeru Watanabe

Atsushi Ikeda

Kenichi Yoshimura

Kenji Sasaki

Yusuke Yoshida

Yoshiaki Takigahira

Satoshi Fukuoka

Shuji Yoshitsune

Kosuke Oura

Masahiko Inoue

Shota Toma

Takuto Fukuhara

Yohei Sakai

Shigenobu Honda

Kosei Hashimoto

Yu Akai

A developing roll for use in an image-forming apparatus using electrophotography includes a cylindrical core made of metal; an annular elastic layer made of rubber and arranged around the core; and an annular surface layer arranged around the elastic layer. The surface layer includes a central portion and end portions. The central portion is located at the center of the developing roll in the longitudinal direction, the end portions are located at opposite end portions of the developing roll in the longitudinal direction. A coefficient of kinetic friction of the outer peripheral surface of each end portion of the surface layer is less than or equal to 0.1, and a ten-point average roughness Rof the outer peripheral surface of each end portion of the surface layer is less than or equal to 1.8 μm.

Developing roll and developing device for use in image-forming apparatus using electrophotography

The seal structure includes a shaft member, a bush having a shaft hole for passing the shaft member, a pressure-receiving member having a facing surface facing an end surface of the bush on one side in the direction of the axis, and an elastic member that presses the bush against the pressure-receiving member from another side in the direction of the axis, in which a first coating layer is formed between an outer peripheral surface of the shaft member and an inner peripheral surface of the shaft hole of the bush, and a second coating layer is formed between the end surface of the bush on one side in the direction of the axis and the facing surface of the pressure-receiving member.

Seal structure

A sealing device provides sealing so as to prevent a sealed fluid in a machine inner side from leaking to a machine outer side between a housing and a rotating shaft which is inserted to a shaft hole provided in the housing. The sealing device has a seal flange which is installed to an outer periphery of the rotating shaft, and a seal lip which is installed to an inner periphery of the shaft hole of the housing and slidably comes into contact with the seal flange over an entire periphery. The sealing device includes a thread groove which exerts a fluid pumping action when the rotating shaft rotates. The thread groove is provided at a position which does not intersect a contact area where the seal lip slidably comes into contact with the seal flange over the entire periphery, thereby suppressing generation of static leakage.

Sealing device

A seal ring () is attached to an annular groove () provided on an outer periphery of a shaft (), and slides on a lateral wall surface () of the annular groove () on a lower pressure side. The seal ring () includes: a dynamic pressure generation groove () that generates dynamic pressure with sealed fluid introduced thereinto, the dynamic pressure generation groove () being provided in a sliding region X of a lateral surface () thereof on the lower pressure side in which the lateral surface () slides on the lateral wall surface (); and an introduction hole () that has an opening () at a position away from the lateral surface () of an inner peripheral surface () of the seal ring () by a distance Y, communicates with the dynamic pressure generation groove (), and introduces the sealed fluid into the dynamic pressure generation groove ().

Seal ring

The invention provides a sealing device sealing so as to prevent a sealed fluid in a machine inner side from leaking to a machine outer side between a housing and a rotating shaft which is inserted to a shaft hole provided in the housing. The sealing device has a seal flange which is installed to an outer periphery of the rotating shaft, and a seal lip which is installed to an inner periphery of the shaft hole of the housing and slidably comes into contact with the seal flange over an entire periphery. The sealing device includes a thread groove which exerts a fluid pumping action when the rotating shaft rotates. The thread groove is provided at a position which does not intersect a contact area where the seal lip slidably comes into contact with the seal flange over the entire periphery, thereby suppressing generation of static leakage.

A seal ring capable of stably reducing a rotational torque while preventing the leakage of sealed fluid. The seal ring includes: an abutment joint part () provided at one portion in a circumferential direction thereof; a plurality of dynamic pressure generation grooves () provided at intervals in the circumferential direction on a side of a sliding surface thereof sliding on a lateral wall surface of an annular groove; and foreign matter discharging grooves () that are provided between a region in which the plurality of dynamic pressure generation grooves () is arranged and the abutment joint part () in the circumferential direction on the side of the sliding surface sliding on the lateral wall surface, and that are capable of catching foreign matter intruding from the abutment joint part () and discharging the caught foreign matter to an outside of a sliding part between the seal ring and the lateral wall surface.

Provided is an intake noise reduction device that can suppress an occurrence of noise in an intake pipe. An intake noise reduction device () disposed on a downstream side of a throttle valve in an intake pipe and including a flow-guiding net () that guides an air flow, wherein the flow-guiding net includes a mesh that is configured to be fine in a vicinity of a center of a flow passage in the intake pipe and to become coarser with distance from the vicinity of the center. For example, the mesh flow-guiding net () is formed of a plurality of radial portions () extending radially outward from the vicinity of the center of the flow passage in the intake pipe and a plurality of concentric portions () provided concentrically from the vicinity of the center.

Intake noise reduction device

Growing community of inventors

Fujisawa, Japan

Norimasa Hosonuma