Jtekt Corporation

Toyota Jidosha Kabushiki Kaisha

Kabushiki Kaisha Toyota Chuo Kenkyusho

Ichiro Tarutani

Yuji Nagasawa

Shinji Yamane

Teruhiko Nakazawa

Keisuke Mori

Kenichi Yamaguchi

Ichiro Aoto

Haruhiro Hattori

Ken Yamanaka

Three links within one width-direction unit are included in respectively different link units. The links in the first row and the sixth row from the right end and the left end of a chain are included in the same link unit. The links in the second row and the fifth row are included in the same link unit. The links in the ninth row and the tenth row are included in the same link unit other than the link unit in which the links in the second row and the fifth row are included. With the above structure, the stress amplitude of the links forming a chain for a chain-type continuously variable transmission can be reduced.

Chain for continuously variable transmission

A chain, wound to span between two pulleys each having facing conical surfaces able to change a distance therebetween and sandwiched by the facing conical surfaces, includes: link units each configured such that plate-shaped links, each having openings, are oriented in a chain circumferential direction and arranged in a chain width direction; and pins each extending through the openings of the links of the link units adjacent in the chain circumferential direction and each contacting the conical surfaces of sheaves at both ends thereof. A curvature radius of a shape curve representing a shape of each end face of each pin in a plane perpendicular to the chain circumferential direction is larger at an inner side in a pulley radial direction than at an initial contact point that is a contact point at the time when a load on each pin is 0.

Three links () within one width-direction unit () are included in respectively different link units (). The links in the first row and the sixth row from the right end and the left end of a chain are included in the same link unit (first link unit-). The links in the second row and the fifth row are included in the same link unit (second link unit-). The links in the ninth row and the tenth row are included in the same link unit other than the link unit in which the links in the second row and the fifth row are included (first link unit-or third link unit-). With the above structure, the stress amplitude of the links forming a chain for a chain-type continuously variable transmission can be reduced.

Provided are elements arranged along a ring of a drive power transfer belt wound on pulleys of a belt-drive continuously variable transmission. Each element has a recess at one side of the element and a projection projecting from the other side to fit into the recess of the adjacent element. The projection has a first engagement portion provided at its base side such that a predetermined engagement gap is created on the radially outer side when the projection fits in the recess of the adjacent element, and a second engagement portion provided at the tip side of the projection and decreasing in diameter toward the tip of the projection from the first engagement portion. The gradient with which the diameter of the second engagement portion decreases is larger than the gradient with which the diameter of the first engagement portion decreases toward the tip of the projection.

Elements of drive power transfer belt of belt-drive continuously variable transmission for vehicle

A stationary pulley () includes a pressing pulley () having a stationary pulley surface () and also includes a support pulley () having a rotating shaft () fixed to the center section of the support pulley. The support pulley () is placed so as to face a movable pulley surface () across the pressing pulley () in the direction of the axis of the rotating shaft (), and the support pulley () supports an outer peripheral section () of the pressing pulley () so as to restrain axial movement of the outer peripheral section (). The pressing pulley () has an inner peripheral section () axially movable relative to the rotating shaft () and can transmit torque to the rotating shaft ().

Growing community of inventors

Owariasahi, Japan

Ichiro Tarutani