Nsk Corporation

Hitachi Metals, Ltd.

Proterial, Ltd.

Junji Ono

Kota Fukuda

Yuta Sugiyama

Teruyuki Nakamura

Masahiro Kobayashi

Kinji Yukawa

Takahiro Odera

Shinji Okada

Takahiko Uchiyama

Mamoru Aoki

Kenichi Iso

Nariaki Aihara

Hirotaka Kishida

Koichiro Ono

Taketoshi Chifu

Kenichi Shibasaki

Takiyoshi Yamada

Masahiro Harunaga

Makoto Yasuda

Jianjun Zhan

A method of manufacturing a magnetostrictive torque sensor shaft () to which a sensor portion () of a magnetostrictive torque sensor () is mounted. The method includes heat treatment step of subjecting an iron-based shaft member to a carburizing, quenching, and tempering process, and a shot peening step of performing shot peening using a boron-free zirconia shot media having a Vickers hardness at least equal to 1100 and at most equal to 1300, at least in a position on the shaft member, after the heat treatment step, to which the sensor portion is to be attached. The surface of the shaft member, after shot peening, has a total error, including hysteresis error and angle error, of not more than 3%.

Method of manufacturing magnetostrictive torque sensor shaft

A method for manufacturing a magnetostrictive torque sensor shaft () to which a sensor portion () of a magnetostrictive torque sensor () is to be attached includes: a heat treatment step of subjecting an iron-based shaft member to a carburizing, quenching, and tempering process; a shot peening step of performing shot peening using a steel shot media having a Vickers hardness at least equal to 1100 and at most equal to 1300, at least in a position on the shaft member, after the heat treatment step, to which the sensor portion () is to be attached; and a surface polishing step of subjecting the shaft member after the shot peening to surface polishing.

Method for manufacturing magnetostrictive torque sensor shaft

A torque measurement device includes a case that does not rotate even during use; a rotating shaft rotatably supported to the case and having a magnetostrictive effect part whose magnetic permeability changes according to a transmitted torque; and a magnetostrictive sensor having a detection part arranged closely adjacent to the magnetostrictive effect part so that a voltage changes according to change of the magnetic permeability of the magnetostrictive effect part, and being supported to the case; and the torque measurement device has a rotation-preventing construction configured to prevent the magnetostrictive sensor from rotating with respect to the case.

Torque measurement device

A torque load member has a detected surface which is configured to face a magnetostrictive torque sensor. The detected surface is a shot peened surface whose magnetic anisotropy directed in a specific direction has been reduced by performing shot peening thereto at an arc height value of 0.31 mmA or more.

Torque load member and method for manufacturing same, and torque measuring device

A torque measuring device includes: a magnetostrictive sensor having a ring-shaped holder arranged around a magnetostrictively affected section of a rotating shaft, a detecting section embedded in the holder and that changing a voltage according to a change in magnetic permeability of the magnetostrictively affected section; and a sensor-side engaging section; and a fixed member having a fixed-side engaging section, the fixed member not rotating even during operation. One of the sensor-side engaging portion and the fixed-side engaging section is a convex section and the other is a concave section. With the sensor-side engaging section and the fixed-side engaging section engaged with a concave-convex engagement, shifting of the position of the magnetostrictive sensor in the direction of rotation and the radial direction with respect to the substrate is prevented.

Torque measuring device

A detection circuit for a magnetostrictive torque sensor is configured to detect a torque applied to a magnetostrictive material treated by shot peening. The detection circuit includes a detection coil provided around the magnetostrictive material, and a drive unit for providing alternating current excitation to the detection coil. The torque applied to the magnetostrictive material is detected based on a change in inductance of the detection coil, and the drive unit provides alternating current excitation at a frequency at which a skin effect thickness is not more than an effective depth of the shot peening.

Detection circuit and detection method for magnetostrictive torque sensor

A single-cavity toroidal continuously variable transmission capable of suppressing gyro slippage and achieving mitigation of bearing loss and a longer service life. A pitch circle diameter (PCD) of the output-side bearing is smaller than that of the input-side bearing and a ball diameter of the output-side bearing is smaller than that of the input-side bearing. Therefore, centrifugal force acting on the ball of the output-side bearing on a speed increasing side with a low load can be suppressed. Therefore, gyro slippage can be suppressed and mitigation of bearing loss can be achieved. Furthermore, with a groove R ratio of the output-side bearing smaller than that of the input-side bearing, a longer service life can be achieved even when the pitch circle diameter (PCD) and ball diameter of the output-side bearing are smaller than those of the input-side bearing.

Single-cavity toroidal continuously variable transmission

A resin snap cagecomprises a resin-made circular main part, a plurality of pocketsprovided in one axial end face of the circular main part, and a circular reinforcing memberinstalled concentrically at the other end face in an axial direction of the circular main part. While this reinforcing memberis circular along the circular main part, a sectional shape in a plane parallel to an axial direction is a rectangle. The reinforcing memberis embedded in a recessed portion formed at the other end face in an axial direction of the circular main partto be integrated, an outside diameter surface, an inside diameter surface, and a pocket-side surfaceof the reinforcing memberare covered with the circular main part, and a surfacethereof opposite to the pocket side is exposed. This resin snap cageis produced by insert molding where the reinforcing memberis made as an insert, and the circular main partand the reinforcing memberare integrated at the time of the insert molding.

Resin cage and rolling bearing

An encodera characteristic of which is changed alternately at an equal interval in a circumferential direction is supported/fixed onto a hubconcentrically with the hub. A sensing portion of a sensorsupported on the outer ringis positioned in close vicinity to a sensed surface of the encoderto face thereto. Width dimensions of first and second sensed portions provided onto the sensed surface are changed continuously in a direction along which a to-be-sensed load is applied. Since a pattern according to which an output signal of the sensoris changed is changed pursuant to a change of the load, the load is derived by observing this pattern. The output signal is also utilized to sense a rotation speed of the hubin ABS or TCS control.

Growing community of inventors

Kanagawa, Japan

Junji Ono