Tpr Co., Ltd.

Honda Motor Co., Ltd.

Ono Sokki Co., Ltd.

Ipr Industry Co., Ltd.

Naoki Umeda

Akira Hikone

Masayuki Ohira

Takahiro Matsumoto

Takashi Sato

Atsushi Shibata

Noriaki Ayuzawa

Seiji Tamaki

Takashi Oizumi

Isamu Inoue

Takashi Oguro

Yushi Abe

Shuichi Tsukatsune

Haruhiko Tateno

Toshihiro Yamaoka

An outer circumferential surface of a piston ring has a cut surface forming a notched portion between an outer circumferential end surface and a lower surface, the cut surface including a first surface between the outer circumferential end surface and a bottom portion, and a second surface between the bottom portion and the lower surface. The second surface is inclined away from a central axis of the piston ring as it extends toward a crank chamber side, an angle of inclination of the second surface with respect to the bottom portion being greater than or equal to 50° and less than or equal to 85°. When an axial width of the piston ring is hand a distance in an axial direction between a connecting portion between the cut surface and the outer circumferential end surface and a connecting portion between the cut surface and the lower surface is H, H/his greater than or equal to 0.2 and less than or equal to 0.4.

Piston ring

An oil control ring comprises: an oil ring having a pair of land parts arranged in a sliding direction and connected to each other by a web part; and a coil expander that biases the oil ring toward the outer circumferential side in the radial direction. The web part of the oil ring is provided with a plurality of window holes. In the axial cross-sectional view of the largest opening portion of the window hole in the axial direction of the oil ring, a width Hin the sliding direction of the oil ring and a length Lof a combustion chamber-side non-window hole part, which excludes the window hole, in the outer circumferential surface of the web part, satisfy the condition of 0.15>L/H

Oil control ring

The present invention addresses the problem of providing a cylinder liner or a cylinder bore, which can reduce not only friction on a sliding surface but also oil consumption. In a piston sliding direction of the cylinder bore, grooves of a second sliding region positioned on the side of crankcase have a higher groove area ratio at a depth of 0.3 &#x3bc;m than grooves of a first sliding region positioned on the side of combustion chamber, and the groove area ratio is in a specific range, whereby friction and oil consumption can be reduced.

Cylinder liner and cylinder bore

A vehicle locking device locking a vehicle on a chassis dynamometer, equipped with rollers allowing driving wheels of the vehicle placed thereon, while keeping the driving wheels thereof placed on the rollers, was configured so as to detect angles of traction, to determine traction forces optimum for hauling the vehicle based on the detected angles, and to control the vehicle locking device based on thus-determined traction forces so as to take up a belt, aiming at readily and stably locking a test vehicle under optimum traction forces.

Vehicle locking device and vehicle locking method

Growing community of inventors

Tokyo, Japan

Naoki Umeda