Nhk Spring Co., Ltd.

Hino Motors, Ltd.

Horikiri, Inc.

Aichi Steel Corporation

Mamoru Akeda

Akira Tange

Mitsuru Enomoto

Nobuhiro Shibuya

Kiyoshi Kurimoto

Yurika Goto

Junichi Yano

Kouji Nakamura

Atsushi Sugimoto

Isamu Okuyama

Tange Akira

Goto Yurika

Kurimoto Kiyoshi

Sugimoto Atsushi

A suspension apparatusincludes a leaf springin which a front end and a rear end are rotatably supported by a frameof a car and an intermediate portion thereof in a longitudinal direction is attached to an axle; and a stayhaving an engaging portionfor blocking rotation of a portion to a rear of a breaking point of the leaf springwhen the leaf springis broken at a portion to a rear of the intermediate portion thereof.

Suspension apparatus

A suspension device for suspension of an axle by an intermediate portion of a single leaf spring has first restriction device which restricts, upon breakage of the leaf spring at a position behind the intermediate portion of the spring, the rear portion of the leaf spring from tilting downwardly relative to a shackle, and a second restriction device for restriction of the shackle from pivotally moving backward beyond a predetermined angle. The first restriction device is constituted by a stopper plate on the shackle for support of the rear portion of the leaf spring from below upon breakage.

Suspension device

Disclosed is steel for a leaf spring with high fatigue strength containing, in mass percentage, C: 0.40 to 0.54%, Si: 0.40 to 0.90%, Mn: 0.40 to 1.20%, Cr: 0.70 to 1.50%, Ti: 0.070 to 0.150%, B: 0.0005 to 0.0050%, N: 0.0100% or less, and a remainder composed of Fe and impurity elements. Also disclosed is a high fatigue-strength leaf spring part obtained by forming the steel. The steel for a leaf spring is prepared to have a Ti content and a N content to satisfy a relation of Ti/N&#x2267;10. Preferably, the leaf spring part is subjected to a shot peening treatment in a temperature range of the room temperature through 400&#xb0; C. with a bending stress of 650 to 1900 MPa being applied to it.

Steel for leaf spring with high fatigue strength, and leaf spring parts

Leaf springs have improved durability in spite of using inexpensive spring steel such as SUP9 and SUP11 as materials. While a spring main body, made of the spring steel in which Brinell hardness is under 555 HBW and not less than 388 HBW (corresponding to a diameter of under 2.70 mm of hardness and not less than 3.10mm of hardness on a Brinell ball mark), is maintained at 150 to 400&#xb0; C., the load is applied in the direction in which the spring main body is to be used, and the first shotpeening is performed at the plane where the tensile stress acts.

Method for manufacturing a leaf spring

An accumulator comprises a housing and a rod. The housing is sealed by means of high- and low-pressure sealing devices. The high-pressure sealing device includes an annular groove formed on the inner surface of the housing, a seal ring with an L-shaped section housed in the annular groove, and an elastomeric O-ring disposed on the outer periphery side of the seal ring. The seal ring is composed of a thin wall portion, situated on the high-pressure side, and a thick wall portion situated on the low-pressure-side. The inner peripheral surface of the thick wall portion is in contact with the outer peripheral surface of the rod. A gap, which is wide enough to receive the hydraulic fluid, is defined between the inner peripheral surface of the thin wall portion and the outer peripheral surface of the rod. A drain recovery hole is connected between the high- and low-pressure sealing devices.

Sealing structure of an accumulator

Growing community of inventors

Yokohama, Japan

Mamoru Akeda