Tokico, Ltd.

Other

Hideaki Ishii

Takahiro Tokunaga

Naganori Koshimizu

Kazuhiro Doi

Tadashi Tamasho

Yoshihiro Nakamura

Yoshihiro Hayashida

Kinzo Kobayashi

Shinji Suzuki

Atsushi Takano

Tsutomu Hamabe

Youichi Kumemura

Masahiko Yamamoto

Joichi Yokoo

A protective boot having a bellows portion, a cylindrical portion, a guide-bore-side mounting portion, a thick-walled portion, a thin-walled portion, a pin-side mounting portion and an air passage groove. In an operation for mounting of the protective boot, the pin-side mounting portion is inclined radially inward through the thin-walled portion while being slidably moved along the sliding pin, to thereby effect an escape of air contained in an annular space between the sliding pin and the boot through the air passage groove. The thick-walled portion prevents the pin-side mounting portion from bending radially inward to an undesirable extent. Thus, the operation for mounting of the protective boot can be smoothly conducted.

Disc brake

In the disk brake, mounting portions of the caliper of a disk brake extending toward the entrance side and the exit side with respect to the rotation direction of the disk. Relative to the rotation direction, the length of the mounting portion on the entrance side is greater than that of the mounting portion on the exit side so that the cylinder portion is offset toward the exit side. Further, the mounting portion on the entrance side has thickenings formed to extend in a longitudinal direction thereof, so that with respect to the direction of the axis of the disk, the thickness of the mounting portion on the entrance side is greater than that of the mounting portion on the exit side. During braking, when a bending moment acts on the caliper, which can cause inclination of the caliper relative to the disk, flexural rigidity of the mounting portion on the entrance side is higher than that of the mounting portion on the exit side.

Disk brake

A disk pass portion for receiving a part of a disk is provided between a cylinder portion and an outer claw portion of a caliper body at the inner peripheral side of a bridge portion of the caliper body. A pair of mounting portions extend arcuately from both sides of the bridge portion to lie outside the disk pass portion with respect to the radial direction of the disk. A pair of sliding pins are secured to the distal ends of the mounting portions through pin bolts and slidably fitted in pin-fitting holes provided in a mounting member supporting the caliper. When the brake is activated, friction pads are pressed against the disk by the caliper. At this time, deformation of the caliper by reaction forces from the disk is small around the area where proximal portions of the mounting portions are connected to the caliper body.

A disc brake includes a carrier with an inner beam secured to a knuckle, a pair of in board and outboard brake pad assemblies located on opposite sides of a rotor and slideably supported on the carrier, and a caliper extending over the periphery of the rotor and axially moved to urge the in board and outboard brake pad assemblies into frictional engagement with the opposite sides of the rotor. The carrier is constructed so that the difference in natural frequency between a bending mode and a torsion mode is at least 300 Hz. The carrier has a moment of inertia of area/polar moment of inertia of area ratio of at least 0.75.

A drum brake in which a parking brake is incorporated. A parking brake lever is mounted in the interior of a vehicle and is operable to pull a parking lever through a cable. The rotation of the parking lever causes a pair of brake shoes to be forced tightly against a brake drum. This results in the generation of a braking force. A stopper member is provided to limit the maximum angular position of the parking brake. This design prevents contact of the parking lever with a rotary shaft due to excessive pulling of the parking lever and thus damage of the rotary shaft as well as the parking lever.

Drum brake

A master cylinder includes a cylinder defining a cylinder bore therein with one end of the cylinder being open, a sleeve fitted into the cylinder bore, a piston slidably disposed in the sleeve, and a stopper mounted on the one end of the cylinder for abutting against the sleeve to prevent the sleeve from coming off the cylinder. The sleeve includes at least two sleeve members fitted into the cylinder bore in serial disposition from the inner end to the open end of the cylinder bore. A cup seal is disposed between two adjacent sleeve members of the aforementioned at least two sleeve members. The master cylinder further includes a resilient member for forcing one inner sleeve member of the two adjacent sleeve members onto the other sleeve member of the two adjacent sleeve members, thereby forcing the other sleeve member toward the stopper.

Master cylinder

A master cylinder in which a sleeve is provided inside a cylinder main body to define a first pressure chamber in cooperation with primary and secondary pistons. A plurality of through-holes adapted to communicate with an outlet port are disposed in the sleeve in such a manner as to be longitudinally spaced away from each other. positioning means is provided between the sleeve and the cylinder main body for positioning the sleeve with respect to the circumferential direction relative to the cylinder main body. The sleeve is positioned relative to the cylinder main body in such a manner that at least one of the plurality of through-holes adapted to establish communication between the outlet port and the first pressure chamber when the pistons are at their rearmost positions is located to face the top portion of the circumferential wall of the cylinder main body.

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Yamanashi-ken, Japan

Hideaki Ishii