Ntn Corporation

Kyodo Yushi Co., Ltd.

Showa Shell Sekiyu K.k.

Shin Tomogami

Hisaaki Kura

Hiroshi Kawamura

Yuichi Asano

Yoshikazu Fukumura

Masahiro Ozawa

Tohru Nakagawa

Mitsuru Umekida

Kiyoshige Yamauchi

Akira Torii

Shinichi Takabe

Shigeaki Fukushima

Masayuki Kuroda

Takeshi Ikeda

Teruaki Fujio

Tomoshige Kobayashi

Kenji Terada

Takeshi Kohara

Tatsuro Sugiyama

Masazumi Kobayashi

Kiyotake Shibata

Shinya Kondo

Kisao Yamazaki

Masuo Takaki

Yasushi Kawamura

Yuji Onuki

Takahiro Ozaki

Masashi Funahashi

Tetsuo Tsuchiya

Yutaka Tanigaki

Fumio Goto

Tomoaki Kaneko

Naohiro Une

Tomoo Munakata

Masahide Miyata

Toshiharu Kato

Hiroyuki Matsuoka

Toshiyuki Oki

Daigo Nagumo

Kazuhiko Taguchi

A constant velocity universal joint includes outer and inner joint members configured to transmit torque therebetween through intermediation of balls while allowing angular displacement. A power transmission shaft is coupled to the inner joint member. A mounting and dismounting mechanism configured to mount and dismount the power transmission shaft to and from the inner joint member is provided between the inner joint member and the power transmission shaft. The mounting and dismounting mechanism includes a tubular member inserted externally on the power transmission shaft so as to extend from the inner joint member, a fixing member received in the tubular member, and an annular member arranged on an outer periphery of the tubular member. The fixing member is moved in the radial direction along with movement of the annular member in the axial direction so that the fixing member is mountable to and dismountable from the power transmission shaft.

Constant velocity universal joint

A constant velocity universal joint has an outer joint member and an inner joint member that transmits torque while permitting angular displacement due to balls between the inner and outer joint members. An attaching and detaching mechanism for attaching and detaching a power transmission shaft to and from the inner joint member is provided between the inner joint member and the power transmission shaft such that torque can be transmitted between the two. The attaching and detaching mechanism has a cylindrical member that fits over the power transmission shaft, a retaining ring that is radially movable, and an annular member that is axially movable. By using a boot band to fixedly tighten, to the power transmission shaft, a small diameter end portion of a boot closing an opening portion of the outer joint member, the axial position of the annular member is restricted by the small diameter end portion.

A constant velocity universal joint includes an outer joint member and an inner joint member between which torque is transferred through intermediation of balls while allowing angular displacement. A power transmission shaft is coupled to the inner joint member to allow torque transmission therebetween. A mounting and dismounting mechanism configured to mount and dismount the power transmission shaft to and from the inner joint member is provided between the inner joint member and the power transmission shaft. The mounting and dismounting mechanism includes a tubular member, a snap ring mounted inside the tubular member, a pushing member arranged on a radially outer side of the snap ring to be movable in a radial direction, and an annular member arranged on an outer peripheral surface of the tubular member to be movable in an axial direction.

Constant-velocity universal joint

A constant velocity universal joint includes an outer joint member and a joint internal component received in the outer joint member. A shaft is fitted into an inner joint member. The outer joint member has a cup bottom formed on a side opposite to a shaft-fitting side. The cup bottom is configured to regulate movement of the joint internal component toward the side opposite to the shaft-fitting side in a normal state in which an impact generated in an abnormal state is not applied. The cup bottom has a cut portion which is to be cut by the impact generated in the abnormal state involving movement of the joint internal component toward the side opposite to the shaft-fitting side.

A constant velocity universal joint includes an outer joint member having an opening portion at one end thereof, and an inner joint member configured to transmit torque while allowing angular displacement with respect to the outer joint member through balls. End portions of a boot closing the opening portion of the outer joint member are fastened and fixed to a mounting part of the outer joint member and a mounting part of a shaft extending from the inner joint member. At a part of an outer peripheral surface of the shaft where at least an inner peripheral surface of the boot contacts when the shaft takes an operating angle with respect to the outer joint member, a sliding bearing is arranged to reduce abrasion due to friction caused by relative movement between the outer peripheral surface of the shaft and the inner peripheral surface of the boot.

Provided is a fastening band including a steel plate () plated with a plating layer () as a base material. The plating layer () has a self-repairing function of forming a protective film () on a plating peeling part with a component dissolved from the plating layer. The steel plate plated with a zinc-aluminum-magnesium alloy is used as the base material. The plating layer contains 4.0 mass % to 14.0 mass % of aluminum, 1.0 mass % to 10.0 mass % of magnesium, and the balance of zinc. The plating layer contains aluminum and magnesium in a total content of 15 mass % or less and zinc in a content of 85 mass % or more.

Fixing band for constant-velocity universal joint boot

A bearing device includes a recess-projection fitting structure in which a hub wheel and a shaft section, which is fitted in a hole of the hub wheel of the outer joint member of the constant velocity universal joint, are unitized together. In the recess-projection fitting structure, entire fitting regions among projections on the outer surface of the shaft section of the outer joint member and recesses, which fit on the projections, are brought into intimate contact with each other.

Bearing device for a wheel

A bearing device for a wheel prevents backlash in a circumferential direction and has excellent workability for connecting a hub wheel and an outer joint member of a constant velocity universal joint. The bearing device includes a recess-projection fitting structure in which the hub wheel and a shaft section, which is fitted in a hole of the hub wheel of the outer joint member of the constant velocity universal joint, are unitized together. In the recess-projection fitting structure, entire fitting regions among projections on the outer surface of the shaft section of the outer joint member and recesses, which fit on the projections, are brought into intimate contact with each other.

Manufacturing method for a bearing device for a wheel

A bearing device for a driving wheel includes an outer race having an inner periphery in which double-row outer raceway surfaces are formed; a hub wheel and an inner race having outer peripheries in which double-row inner raceway surfaces opposed to the outer raceway surfaces are formed; and double-row rolling elements interposed between the outer raceway surfaces and the inner raceway surfaces. A shaft hole of the hub wheel is formed into a cylindrical shape, and a male spline is formed on an outer periphery of a stem section of the outer joint member so that the stem section of the outer joint member is press-fit into the shaft hole of the hub wheel. With this, recesses caused to fit on the male spline with interference are formed in the shaft hole of the hub wheel, whereby the hub wheel and the outer joint member are separably coupled to each other.

Bearing device for driving wheel, and its assembling method

A hub wheel () and an outer joint member () are coupled to each other through intermediation of a recess-projection fitting structure (M). The recess-projection fitting structure (M) can be separated by being applied with a pulling-out force in an axial direction under a state in which a bolt member () is removed, and can be re-formed by re-screwing the bolt member () into a bolt hole (). The hub wheel () comprises a receiving portion () for receiving the bolt member (). The shaft portion () has a small diameter portion () serving as a fit-in portion to be fitted along an inner periphery of the receiving portion () under a state in which the recess-projection fitting structure (M) is formed. The small diameter portion () is used as a part for confirming the accuracy and the state of the recess-projection fitting structure (M).

Bearing device for wheel

A grease composition for constant-velocity joints which is inexpensive and which and which has an improved anti-flaking property without using materials which have environmental burdens, and a constant-velocity joint enclosing this grease are provided. A grease composition for constant-velocity joints comprising: (a) a base oil, (b) a diurea thickener, (c) a zinc dialkyldithiophosphate, (d) a sulfurized molybdenum dialkyldithiocarbamate, (e) a zinc dialkyldithiocarbamate, and (f) a sulfur-nitrogen extreme pressure additive is provided.

Grease composition for constant-velocity joints and constant-velocity joint enclosing the same

A bearing unit for driving wheels, and a manufacturing method thereof, includes a hub, a bearing, and a constant velocity universal joint, such that a process for assembling the bearing unit to a knuckle member is simplified. In order to achieve this, a hub () and an outer joint member () of an out-board side constant velocity universal joint () are plastically joined together. An outer peripheral surface () of an outer member () is press-fitted into an inner peripheral surface of the knuckle member, and a maximum diameter dimension (D) of the out-board side constant velocity universal joint () is set smaller than a minimum diameter dimension (Dn) of the knuckle member (). Also, a maximum diameter dimension (D) of an in-board side constant velocity universal joint () is set smaller than the minimum diameter dimension (Dn) of the knuckle member ().

Bearing unit for driving wheels

A wheel bearing device suppresses backlash in the circumferential direction and has excellent workability in connecting a hub wheel and an outer joint component of a constant velocity universal joint. The wheel bearing device has a stem shaft of an outer joint component of a constant velocity universal joint fitted into a hole section of a hub wheel that is integrated with the hub wheel by a projection and recess mating structure. In the projection and recess mating structure, an overall recess mating area of a projection is in close contact with a corresponding recess.

Wheel bearing device

Growing community of inventors

Iwata, Japan

Shin Tomogami