Friction engagement device of automatic transmission

Patent metadata

Field	Value
Publication number	US-10655694-B2
Application number	US-201815938108-A
Country	US
Kind code	B2
Filing date	Mar 28, 2018
Priority date	Apr 20, 2017
Publication date	May 19, 2020
Grant date	May 19, 2020

Abstract

A friction engagement device of an automatic transmission is provided, which includes a rotational member comprised of at least one of a drum member and a hub member including a spline part engaged with a friction plate to be movable in axial directions of the automatic transmission, and a drive force transmitting part for exchanging a drive force with another rotational element. The drive force transmitting part of the rotational member is made of a ferrous metal. A part of the rotational member other than the drive force transmitting part is made of a clad material containing a first material that is easily joined to the ferrous metal and a second material that is less easily joined to the ferrous metal compared to the first material and weighs less than the ferrous metal.

First claim

What is claimed is:

1. A friction engagement device of an automatic transmission, comprising a rotational member comprised of at least one of a drum member and a hub member including:
a spline part engaged with a friction plate to be movable in axial directions of the automatic transmission; and
a drive force transmitting part for exchanging a drive force with another rotational element,
wherein the drive force transmitting part of the rotational member is made of a ferrous metal,
wherein a part of the rotational member other than the drive force transmitting part is made of a clad material containing a first material that is joined to the ferrous metal, and a second material that is joined to the ferrous metal with less joint strength compared to the first material and weighs less than the ferrous metal,
wherein the part of the rotational member other than the drive force transmitting part is formed separately from the drive force transmitting part, and
wherein the clad material has a first material side containing the first material and comprising the part of the rotational member other than the drive force transmitting part, the first material side engaging with the drive force transmitting part.

2. The friction engagement device of claim 1 , wherein the first material of the clad material is the ferrous metal, the second material is aluminum, and the clad material has a two-layer structure of the first and second materials.

3. The friction engagement device of claim 2 , wherein the part of the rotational member other than the drive force transmitting part has a joint portion with the drive force transmitting part, the spline part of the rotational member has an engaging portion with the friction plate, and the joint portion and the engaging portion are made of the first material of the clad material.

4. The friction engagement device of claim 2 , wherein a portion of the spline part of the rotational member on an opposite side from an engaging portion with the friction plate is made of the first material of the clad material.

5. The friction engagement device of claim 1 , wherein the clad material has a three-layer structure in which an intermediate layer is made of the second material and layers on both sides of the intermediate layer are made of the first material.

6. The friction engagement device of claim 1 , wherein the drive force transmitting part of the rotational member has a vertical wall portion extending orthogonal to an axis of the rotational member, and
wherein the clad material is joined to the vertical wall portion.

7. The friction engagement device of claim 1 , wherein the drive force transmitting part of the rotational member has a circumferential surface portion having a center line parallel to an axis of the rotational member, and
wherein the clad material is joined to the circumferential surface portion.

Assignees

• Mazda Motor

Inventors

• Okumura Shinya
• Shiino Kazuyuki
• Kouno Hirokazu
• Sasaki Masanori
• Fujikawa Masamichi
• Miura Yasuo
• Morihiro Masashi
• Tanaka Takeyuki
• Takemura Yuya

Classifications

• F16H57/0025

  with gearing elements rigidly connected to a shaft, e.g. securing gears or pulleys by specially adapted splines, keys or methods · CPC title

• F16D2250/0076

  Welding, brazing · CPC title

• F16D2200/0008

  Ferro · CPC title

• F16D2069/009

  Linings attached to both sides of a central support element, e.g. a carrier plate · CPC title

• F16D67/02

  Clutch-brake combinations · CPC title