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US 5,348,123 AGranted
Brake actuating apparatus for a vehicle
AssigneesAkebono Brake Industry Co., Ltd., Akebono Research and Development Centre Ltd.
InventorsKimio Takahashi, Katsuya Miyake, Takashi Kunimi, Tatsuo Ogawahara, Tadashi Kobayashi, Kunio Fukaya
Life of this patent
Estimating the term…
Abstract
A brake actuating apparatus which includes a motor disposed at a brake caliper, a driving piston connecting through a converting member which converts a rotary motion of the motor into a linear motion, and a fluid chamber disposed between the driving piston and a pad urging piston for urging the brake pad in the brake caliper, and a diameter of the driving piston is arranged smaller than that of the pad urging piston.
Claims26
A brake actuating apparatus, comprising:
- a brake caliper comprising a frame body and a cylindrical portion;
- a brake pad held by said brake caliper for urging against a brake wheel cylinder for braking;
- an electric motor fixed onto said frame body of said brake caliper, said electric motor being controlled to rotate by a drive signal of an electronic control unit;
- a drive piston slidably held in said cylindrical portion of said caliper, said drive piston having a first piston head;
- means for converting a rotary motion of said electric motor into a linear motion of said drive piston so that said drive piston linearly and non-rotatably slides within said cylindrical portion, said converting means being held in said cylindrical portion of said brake caliper;
- a pad urging piston held in said frame body of said caliper beyond said cylindrical portion and proximate to said brake pad, said pad urging piston for urging said brake pad when said drive piston linearly slides toward said pad urging piston, said pad urging piston having a second piston head;
- and
- a fluid chamber defined between said pad urging piston and said drive piston, the fluid chamber for transmitting pressure to urge said pad urging piston when said drive piston linearly slides toward said pad urging piston.
5 more elements
A brake actuating apparatus disposed on a brake caliper of a vehicle, comprising:
- a motor fixed to the caliper;
- a converting portion operationally connected to said motor for converting a rotary motion of said motor into a linear motion;
- a drive piston residing in the caliper and operationally connected to said motor through said converting portion so that said drive piston linearly and non-rotatably slides within the caliper, said drive piston having a first piston head;
- a pad urging piston slidably residing in the caliper, said pad urging piston for urging a brake pad held in the caliper when said drive piston linearly slides toward said pad urging piston, said pad urging piston having a second piston head;
- and
- a fluid chamber for holding brake fluid in the caliper between said drive piston and said pad urging piston, the fluid chamber for transmitting pressure to urge said pad urging piston when said drive piston linearly slides toward said pad urging piston.
3 more elements
A brake actuating apparatus, comprising:
- a brake caliper including a frame body and a cylindrical bore extending through the caliper;
- a brake pad for engaging a brake wheel cylinder for braking, the brake pad being held by said brake caliper;
- an electric motor fixed onto the frame body, the electric motor being controlled to rotate by a drive signal from an electronic control unit;
- a drive piston having a first piston head, the drive piston slidably residing in the cylindrical bore;
- conversion means for converting a rotary motion of the electric motor into a linear motion of the drive piston so that the drive piston linearly and non-rotatably slides within said cylindrical bore, the conversion means being held in the cylindrical bore;
- a pad urging piston having a second piston head, the pad urging piston held in the frame body beyond the cylindrical bore and proximate to the brake pad for urging the brake pad when the drive piston linearly slides toward the pad urging piston, a ratio of a surface area of the first piston head to a surface area of the second piston head being within a range of one-third to one-tenth;
- and
- a fluid chamber defined between the pad urging piston and the drive piston, the fluid chamber for transmitting pressure to urge the pad urging piston when the drive piston linearly slides toward the pad urging piston.
5 more elements
Dependencies are inferred from the claim text.