Hitachi Astemo Ltd.

Hitachi Automotive Systems Kyushu, Ltd.

Hitachi Automotive Systems Hyushu, Ltd.

Kenichiro Ishikura

Hiromichi Komai

Hidekazu Aoki

Toshiyuki Masuda

Yasutomo Mabe

Xiaojin Zhu

Yasushi Akita

Kiyokazu Nakane

Tatsuya Shimoda

Kenichi Sugiyama

Kazuhisa Yokoyama

Daiki Tsutsumi

Shinichi Sato

Propeller shaft has boot member () whose one end is fixed to sleeve shaft () and whose other end is fixed to stub shaft (), and boot bands () fixing boot member () to sleeve shaft () and stub shaft (). Protrusions () fitted in respective fitting grooves () formed on outer circumferential surfaces of sleeve shaft () and stub shaft () are provided on inner circumferential sides of one end and the other end of the boot member (). At each of sleeve shaft () and stub shaft (), first outer diameter section () having diameter larger than an inside diameter (D) of protrusion () is provided at one side with respect to fitting groove (), also second outer diameter section () having diameter larger than an outside diameter (X) of first outer diameter section () is provided at the other side with respect to fitting groove ().

Propeller shaft and production method therefor

A propeller shaft includes a rotational shaft and a constant-velocity joint. The constant-velocity joint includes an inner race member connected to the rotational shaft, a rolling member disposed on an outer periphery of the inner race member in a radial direction relative to a direction of a rotational axis of the rotational shaft, and a tubular outer race member provided on an outer periphery of the rolling member in the radial direction and configured so that a rotational force of the rotational shaft is transmitted thereto via the rolling member. The outer race member has first and second end portions of the outer race member in the direction of the rotational axis. The outer race member includes a centering portion provided at the first end portion and formed so as to be smaller than a maximum diameter of the outer race member in the radial direction.

Propeller shaft

A propeller shaft as a power transmission shaft includes a CFRP tube formed in a cylindrical shape as a shaft member, wherein a helical layer portion mainly bearing torsional strength and bending strength is made of carbon fiber of first carbon fiber material having a relatively high tensile strength (or a tensile elasticity), and wherein a hoop layer portion that is disposed at least one of inside and outside of the helical layer portion in a radial direction with respect to a rotational axis thereof and that does not bear torsional strength or bending strength is made of carbon fiber of second carbon fiber material having a tensile strength (or a tensile elasticity) lower than that of the first carbon fiber material.

Power transmission shaft

In a propeller shaft, a crowning portion of a male spline portion is provided in a predetermined range including a front end portion in an axial direction, and a tooth tip surface is shaped in such a manner that a tooth thickness thereof gradually increases from the front end portion toward an intermediate portion of the male spline portion in the axial direction.

Power transmission shaft and method for manufacturing the same

A propeller shaft includes constant-velocity joints at both the end portions of a first shaft member.

A propeller shaft () that is a power transmission shaft has a shaft member () as a tubular body made of iron-based metal and a balance weight () made of iron-based metal and welded to an outer peripheral surface of this shaft member (). At least a part of the balance weight () of the propeller shaft () is covered with a sacrificial metal coating () made of sacrificial corrosion prevention material that contains metal whose ionization tendency is higher than that of metal forming the shaft member (). With this, it is possible to suppress local progression of corrosion at a periphery of the balance weight () and improve durability of the propeller shaft ().

Power transmission shaft and method for manufacturing same

A propeller shaft (PS) has a balance piece () on the outer peripheral side of a stub shaft body section () of a stub shaft (), which is axially separated from both spline sections (), which are spline fitting sections. Due to this configuration, changes in the gap in both spline sections () when the balance piece () is welded are minimized, and the occurrence of new rotational imbalance can be minimized. As a result, rotational imbalance in the propeller shaft (PS) due to the balance piece () can be corrected appropriately and easily.

A low surface-roughness part is formed at a first tapered part, and, as a result, the roughness of an opening-edge of a groove part of an internal spline part that opens at the first tapered part is reduced, and surface pressure applied by the opening edge to a tooth of an external spline part can be reduced. As a result, the opening edge of the groove part of the internal spline part can be kept from digging into the tooth, and variation, between products, in the insertion load of a second shaft part can be suppressed.

Propeller shaft and production method for same

A power transmission shaft includes: a bearing including a cylindrical portion, an internal spline portion, and an internal spline side annular groove including a bottom surface, and a first side wall and a second side wall, the first side wall which includes a first inclination surface inclined with respect to the rotation axis of the shaft portion, and on which the circlip is abutted in a state where a radius of the circlip is decreased within the internal spline side annular groove, and the second side wall on which the circlip is abutted in the state where the radius of the circlip is decreased within the internal spline side annular groove.

A propeller shaft as a power transmission shaft is provided between vehicle-side first second shaft parts, and a first tube as a first shaft member is connected to the first shaft part through a first joint member and to the second shaft part through a second joint member. The first tube is connected to the first joint member through a first collar member and to the second joint member through a second collar member. The first collar member includes a first main body part exposed from a first end portion of the first tube, and a first insertion part inserted into the inside of the first end portion. In at least the first collar member, the maximum value of the outer diameter of the first main body part is set to be no greater than the maximum value of the outer diameter of the first insertion part.

A low surface-roughness part is formed at a first tapered part, as a result, the roughness of an opening-edge of a groove part of an internal spline part that opens at the first tapered part is reduced, and surface pressure applied by the opening edge to a tooth of an external spline part can be reduced. As a result, the opening edge of the groove part of the internal spline part can be kept from digging into the tooth, and variation, between products, in the insertion load of a second shaft part can be suppressed.

A propeller shaft includes a shaft part and a a first yoke having a fixing portion, a connecting portion, a first yoke portion and a first concave portion. The connecting portion is provided apart from a first concave portion in the direction of the rotation axis of the shaft part. An outside diameter of the connecting portion is greater than an outside diameter of the shaft part in a radial direction of the rotation axis of the shaft part.

Propeller shaft and yoke structure of universal joint used for the propeller shaft

A propeller shaft includes a shaft part, a first yoke, a connecting portion, a first yoke portion, a first concave portion, and a second yoke having a flange and a second yoke portion. The flange has a bolt insertion hole into which a securing member is inserted, and is connected to a second shaft part of a vehicle side by the securing member. The second yoke portion is provided at the flange, and has a shape that extends in a direction of a rotation axis of the shaft part. A cruciform shaft couples the first yoke portion with the second yoke portion.

A propeller shaft has a first yoke having a fixing portion, a pair of first bifurcated yoke portions extending from one end portion of the fixing portion in an axial direction, and a first bearing hole formed at each first yoke portion and securing therein a first bearing that holds a cruciform shaft; a second yoke coupled to the first yoke through the cruciform shaft and secured to a predetermined member, and having a mounting flange, and a bolt insertion hole which is formed at the mounting flange and into which a bolt to secure the second yoke to the predetermined member is inserted; and a securing member securing the mounting flange of the second yoke to the predetermined member through the bolt by a fastening tool. Each first yoke portion is provided with a first concave portion that slides thereon an outer circumferential surface of the fastening tool.

Growing community of inventors

Atsugi, Japan

Kenichiro Ishikura