Honda Motor Co., Ltd.

Honda Giken Kogyo Kabushiki Kaisha

Motonori Ohnuki

Toru Yagasaki

Shigeru Kanehara

Takashi Hotta

Tadami Kondoh

Kazuya Kubo

A transmission includes a transmission mechanism. The transmission mechanism includes a planetary gear mechanism and a fixing element. A ring gear is provided with a first gear meshing with an output gear on an output member and a second gear meshing with a plurality of pinion gears. The output gear and the first gear include helical gears meshing with each other. The second gear and the plurality of pinion gears include helical gears meshing with each other. Helix angles of the output gear and the first gear and helix angles of the second gear and the plurality of pinion gears are set so that a thrust force generated in a case where the output gear and the first gear rotate and a thrust force generated in a case where the second gear and the plurality of pinion gears rotate are directed towards each other.

Transmission

A belt (metal V belt) has a number of elements held by a ring in an endless shape and aligned in a peripheral direction of the ring. The element includes a head portion, a neck portion and a body portion. The body portion has a V face brought into contact with a drive pulley and a driven pulley and left and right locking edge portions wrapped with the ring and disposed on an inner peripheral side of the ring. The head portion is disposed on an outer peripheral side of the ring and having an ear portion extended to left and to right sides to be opposed to the locking edge portion. The neck portion integrally connects the body portion and the head portion. Front faces of the ear portion, the neck portion and the locking edge portion of the element are formed with contact portions capable of bringing the contiguous elements into contact with each other.

Belt for continuously variable transmission

Each of metal elements includes an element body portion and an element head portion on radially inner and outer sides of left and right ring slots into which metal ring assemblies are fitted, respectively. The metal elements can be brought into contact with one another at inner contact surfaces and outer contact surfaces each of which are formed on the element body portion and the element head portion , respectively. The width W of each of the outer contact surfaces which is in contact with each other when the metal elements are in a chord portion of the metal belt, is set at a large value so as to prevent the yawing of the metal elements , and the width W of each of the inner contact surfaces which is in contact with each other when the metal elements are in a pulley-wound zone, is set at a small value so as to permit the yawing of the metal elements , whereby the absorption of a misalignment between a drive pulley and a driven pulley and the prevention of the zigzag movement of a metal belt can be reconciled.

A ring gear support member is supported radially immovably on the outer circumference of an input shaft through a ball bearing. A brake hub of a reverse brake, as supported by the ring gear support member, is made movable in the circumferential direction relative to the ring gear support member and is urged to a center position by a coil spring. When the reverse brake is applied to couple the ring gear support member unrotatably to a casing, the brake hub is supported through the coil spring by the ring gear support member. As a result, the meshing vibration, as generated at the meshing portion between pinions and a ring gear, can be prevented from being transmitted to the casing through the brake hub, thereby reducing noise.

Growing community of inventors

Wako, Japan

Motonori Ohnuki