Brake device of transmission

Patent metadata

Field	Value
Publication number	US-2017276235-A1
Application number	US-201515514445-A
Country	US
Kind code	A1
Filing date	Oct 14, 2015
Priority date	Oct 30, 2014
Publication date	Sep 28, 2017
Grant date	—

Abstract

A brake device of a transmission according to the present invention includes: a rotary-side holding member including an inner peripheral surface having a cylindrical surface shape about an axis extending in a forward/rearward direction and configured to hold a rotary-side friction plate on the inner peripheral surface; a fixed-side holding member including an outer peripheral surface having a cylindrical surface shape about the axis extending in the forward/rearward direction and configured to hold a fixed-side friction plate on the outer peripheral surface; and a lubricating oil supply portion supplying lubricating oil to the fixed-side friction plate and the rotary-side friction plate. The fixed-side holding member is provided in a transmission casing so as not to rotate. The rotary-side holding member is provided in the transmission casing at a radially outer side of the fixed-side holding member and is rotatable about a central axis of the inner peripheral surface.

First claim

1 . A brake device accommodated in a transmission casing,
the brake device comprising: a rotary-side friction plate coupled to a predetermined rotary element; a rotary-side holding member configured to hold the rotary-side friction plate and be rotatable; a fixed-side friction plate arranged so as to be opposed to the rotary-side friction plate in a forward/rearward direction and configured to be engaged with and disengaged from the rotary-side friction plate; a fixed-side holding member configured to hold the fixed-side friction plate and not to rotate; and a lubricating oil supply portion configured to supply lubricating oil to the fixed-side friction plate and the rotary-side friction plate, wherein: the rotary-side holding member includes an inner peripheral surface located at a radially outer side of the fixed-side holding member; and the rotary-side friction plate is attached to the inner peripheral surface of the rotary-side holding member.

2 . The brake device according to claim 1 , wherein the lubricating oil supply portion includes a lubricating oil introducing portion which extends from an inner peripheral surface of the transmission casing toward the fixed-side holding member, that is, toward a radially inner side, and introduces the lubricating oil to the fixed-side holding member from an outside of the transmission casing.

3 . The brake device according to claim 2 , further comprising:
a retaining member arranged so as to be opposed to the friction plates; and a piston configured to push the friction plates toward the retaining member, wherein: the retaining member extends toward the radially outer side from a portion of the fixed-side holding member, the portion being located at a rear side of the friction plates; and the piston is provided in front of the friction plates.

4 . The brake device according to claim 3 , wherein the rotary-side holding member includes a rotary-side groove portion which is a groove formed on the inner peripheral surface of the rotary-side holding member to extend in the forward/rearward direction and into which a radially outer end of the rotary-side friction plate is inserted,
the brake device further comprising: an extending portion extending toward the radially inner side from a portion of the rotary-side holding member, the portion being located at a rear side of the rotary-side groove portion; and a dam member provided at a front end of a portion of the rotary-side holding member, the rotary-side groove portion being formed at the portion, the dam member being configured to close at least part of the rotary-side groove portion.

5 . The brake device according to claim 4 , wherein:
the fixed-side holding member includes a plurality of fixed-side groove portions formed at a plurality of respective circumferential direction positions on an outer peripheral surface of the fixed-side holding member and extending in the forward/rearward direction; a radially inner end of the fixed-side friction plate is inserted into part of the plurality of fixed-side groove portions; at least part of the remaining fixed-side groove portions is open toward the radially outer side over the forward/rearward direction; and the lubricating oil supply portion supplies the lubricating oil to the open fixed-side groove portion.

6 . The brake device according to claim 2 , wherein the rotary-side holding member includes a rotary-side groove portion which is a groove formed on the inner peripheral surface of the rotary-side holding member to extend in the forward/rearward direction and into which a radially outer end of the rotary-side friction plate is inserted,
the brake device further comprising: an extending portion extending toward the radially inner side from a portion of the rotary-side holding member, the portion being located at a rear side of the rotary-side groove portion; and a dam member provided at a front end of a portion of the rotary-side holding member, the rotary-side groove portion being formed at the portion, the dam member being configured to close at least part of the rotary-side groove portion.

7 . The brake device according to claim 6 , wherein:
the fixed-side holding member includes a plurality of fixed-side groove portions formed at a plurality of respective circumferential direction positions on an outer peripheral surface of the fixed-side holding member and extending in the forward/rearward direction; a radially inner end of the fixed-side friction plate is inserted into part of the plurality of fixed-side groove portions; at least part of the remaining fixed-side groove portions is open toward the radially outer side over the forward/rearward direction; and the lubricating oil supply portion supplies the lubricating oil to the open fixed-side groove portion.

8 . The brake device according to claim 2 , wherein:
the fixed-side holding member includes a plurality of fixed-side groove portions formed at a plurality of respective circumferential direction positions on an outer peripheral surface of the fixed-side holding member and extending in the forward/rearward direction; a radially inner end of the fixed-side friction plate is inserted into part of the plurality of fixed-side groove portions; at least part of the remaining fixed-side groove portions is open toward the radially outer side over the forward/rearward direction; and the lubricating oil supply portion supplies the lubricating oil to the open fixed-side groove portion.

9 . The brake device according to claim 3 , wherein:
the fixed-side holding member includes a plurality of fixed-side groove portions formed at a plurality of respective circumferential direction positions on an outer peripheral surface of the fixed-side holding member and extending in the forward/rearward direction; a radially inner end of the fixed-side friction plate is inserted into part of the plurality of fixed-side groove portions; at least part of the remaining fixed-side groove portions is open toward the radially outer side over the forward/rearward direction; and the lubricating oil supply portion supplies the lubricating oil to the open fixed-side groove portion.

10 . The brake device according to claim 1 , further comprising:
a retaining member arranged so as to be opposed to the friction plates; and a piston configured to push the friction plates toward the retaining member, wherein: the retaining member extends toward the radially outer side from a portion of the fixed-side holding member, the portion being located at a rear side of the friction plates; and the piston is provided in front of the friction plates.

11 . The brake device according to claim 10 , wherein the rotary-side holding member includes a rotary-side groove portion which is a groove formed on the inner peripheral surface of the rotary-side holding member to extend in the forward/rearward direction and into which a radially outer end of the rotary-side friction plate is inserted,
the brake device further comprising: an extending portion extending toward a radially inner side from a portion of the rotary-side holding member, the portion being located at a rear side of the rotary-side groove portion; and a dam member provided at a front end of a portion of the rotary-side holding member, the rotary-side groove portion being formed at the portion, the dam member being configured to close at least part of the rotary-side groove portion.

12 . The brake device according to claim 11 , wherein:
the fixed-side holding member includes a plurality of fixed-side groove portions formed at a plurality of respective circumferential direction positions on an outer periphera

Assignees

• Mazda Motor

Inventors

• Iwasaki Tatsuhiko
• Kamada Shinya
• Mizobe Tatsutoshi

Classifications

• F16H63/3026

  comprising friction clutches or brakes (band brake actuating mechanisms F16H63/3003) · CPC title

• F16H2063/303

  the friction member is actuated and released by applying pressure to different fluid chambers · CPC title

• F16D67/04

  fluid actuated · CPC title

• F16H57/10 Primary

  Braking arrangements · CPC title

• F16H57/0473

  Friction devices, e.g. clutches or brakes · CPC title