Wet parking brake device

Patent metadata

Field	Value
Publication number	US-10816047-B2
Application number	US-201916430815-A
Country	US
Kind code	B2
Filing date	Jun 4, 2019
Priority date	Jun 7, 2018
Publication date	Oct 27, 2020
Grant date	Oct 27, 2020

Abstract

A wet parking brake device includes a shaft case, a rotary shaft, a plurality of stators, a plurality of brake discs, a piston plate, and a pressing mechanism. The wet parking brake is configured such that the brake discs and the stators come in contact with each other by a pressing from the piston plate pressed by the pressing mechanism to thereby generate a braking force against the rotary shaft. The pressing mechanism includes a parking rod that is turnably supported in the shaft case and has a turning axis in the vertical direction and an arm member that is connected to the parking rod and turns around the turning axis. The parking rod includes a rod main body, an upper shaft portion and a lower shaft portion.

First claim

What is claimed is:

1. A wet parking brake device comprising:
a shaft case;
a rotary shaft accommodated in the shaft case;
a plurality of stators held on the shaft case and arranged side by side movably in an axial direction of the rotary shaft;
a plurality of brake discs held on the rotary shaft and each of which is interposed between any two adjacent stators of the plurality of stators;
a piston plate held on the shaft case and movable toward the brake discs in the axial direction of the rotary shaft; and
a pressing mechanism configured to press the piston plate toward the brake discs,
the wet parking brake device being configured such that the brake discs and the stators come in contact with each other by a pressing from the piston plate pressed by the pressing mechanism to thereby generate a braking force against the rotary shaft, wherein
the pressing mechanism includes:
a parking rod that is turnably supported in the shaft case and has a turning axis in a vertical direction; and
an arm member that is connected to the parking rod and turns around the turning axis,

the parking rod includes:
a rod main body which has an insertion hole through which the rotary shaft is inserted and a pressing portion that presses the piston plate;
an upper shaft portion that is located on an upper part of the rod main body; and
a lower shaft portion that is located on a lower part of the rod main body and is coaxial with the upper shaft portion, and

the rod main body has a shape which does not protrude from an area enclosed by an outer peripheral edge of the piston plate in a radial direction of the rotary shaft.

2. The wet parking brake device according to claim 1 , wherein
a pair of the pressing portions is provided in upper and lower sides of the rod main body,
the piston plate includes a pair of pressed portions in the upper and lower sides thereof, each of the pressed portion being configured to be pressed by the corresponding pressing portion,
each of the pressing portions includes a surface which has a shape of one of a protruded curve and a recessed curve, and
each of the pressed portions includes a surface which has a shape of the other of the protruded curve and the recessed curve and is configured to be in surface contact with the surface which has the shape of the one of the protruded curve and the recessed curve included in the corresponding pressing portion.

3. The wet parking brake device according to claim 1 , wherein the turning axis is perpendicular to a central axis of the rotary shaft.

Assignees

• Toyota Jidoshokki Kk

Inventors

• Maruta Yuki

Classifications

• F16D2125/60

  Cables or chains, e.g. Bowden cables · CPC title

• F16D55/50

  with auxiliary friction members, which may be of different type, producing the self-tightening action · CPC title

• F16D2125/66

  Wedges · CPC title

• F16D2125/28

  Cams; Levers with cams · CPC title

• F16D2121/14

  Mechanical · CPC title