Vehicle drum brake
AssigneeNissin Kogyo Co., Ltd.
InventorAkira Hiratsuka
Life of this patent
Estimating the term…
Abstract
A vehicle drum brake includes: a first brake shoe; a second brake shoe; a parking brake lever connected with the second brake shoe; a pull unit connected with the parking brake lever; a strut including a curved portion which is curved towards an outer circumferential side of the backing plate, the strut being disposed between a portion of the parking brake lever which lies closer to the portion where the pull mechanism is connected than the portion where the parking brake lever is attached and the first brake shoe; a strut return spring for returning the strut in a non-operating state to its initial position is provided to extend between the strut and the second brake shoe; and an engagement hole formed in the curved portion of the strut for one end portion of the strut return spring to be brought into engagement therewith.
Claims20
A vehicle drum brake comprising:
- a pair of brake shoes including a first brake shoe and a second brake shoe, the first brake shoe and the second brake shoe being disposed symmetrically on an interior side of a backing plate which is fixedly attached to a vehicle body so as to move away from each other at distal end portions about proximal end portions thereof as rotating centers to thereby expand a distance therebetween;
- a parking brake lever connected rotatably with the movable distal end portion of the second brake shoe by a pivot;
- a pull unit connected with the parking brake lever;
- a strut including a curved portion which is curved towards an outer circumferential side of the backing plate, the strut being disposed between a portion of the parking brake lever which lies closer to a portion where the pull unit is connected than a portion where the parking brake lever is attached and the movable distal end portion of the first brake shoe;
- a strut return spring for returning the strut in a non-operating state to its initial position being provided to extend between the strut and the second brake shoe;
- and
- an engagement hole formed in the curved portion of the strut for one end portion of the strut return spring to be brought into engagement therewith.
A vehicle drum brake comprising:
- a first brake shoe and a second brake shoe, the first brake shoe and the second brake shoe being disposed symmetrically on an interior side of a backing plate;
- a strut including a curved portion which is curved towards an outer circumferential side of the backing plate;
- a strut return spring for returning the strut in a non-operating state to its initial position being provided to extend between the strut and the second brake shoe;
- and
- an engagement hole formed in the curved portion of the strut for one end portion of the strut return spring to be brought into engagement therewith, wherein:
- the engagement hole is formed into an elliptic shape which is long in a longitudinal direction of the strut, and a lateral side surface of the engagement hole lies on a backing plate side of the engagement hole and is disposed on an extension of a side surface of a web of the second brake shoe which lies on a side opposite to a side thereof which faces the backing plate, and
- the engagement hole is formed so that part thereof is positioned on an imaginary line resulting by extending the side surface lying on the opposite side to the backing plate towards a side surface of a web of the first brake shoe lying on a side opposite to a side thereof which faces the backing plate.
Dependencies are inferred from the claim text.