Brake discs, systems, and methods may include a brake disc and a brake drum. In various embodiments, the brake disc includes a central hub, configured to engage with an axial shaft. The brake disc includes protrusions, each of which is coupled to the central hub and extends perpendicularly from the central hub. The brake disc includes expansion components, each of which is coupled to the central hub at two locations. Each expansion component surrounds an outer periphery of one of the protrusions. The expansion components define a segmented periphery configured as a braking surface. The brake drum is configured to have an inner diameter that is larger than an outer diameter of the brake disc. The outer diameter of the brake disc is defined by the segmented periphery, such that an inner surface of the brake drum is concentric around the segmented periphery of the brake disc.

A caliper guide pin assembly has a tubular guide pin, a cap, a grease valve and a plurality of lubricating grooves; the plurality of lubricating grooves are radially distributed about the tubular guide pin; each of the plurality of lubricating grooves normally traverses into the tubular guide pin from an external surface of the tubular guide pin; each of the plurality of lubricating grooves traverses into the tubular guide pin from a front surface of the tubular guide pin; the cap is concentrically positioned with the tubular guide pin; the cap is positioned about the tubular guide pin, adjacent to the front surface of the tubular guide pin; the grease valve is positioned adjacent to the cap, opposite to the tubular guide pin; the grease valve is adjacently integrated into the cap; the grease valve is in fluid communication with each of the plurality of lubricating grooves.

The flywheel device includes a sealed housing section; a rotor located in the sealed housing section where the rotor is held in a vertical position by a magnetic system; a controller coupled to the magnetic system; and a braking annular ring mounted to the sealed housing section below the rotor, where the rotor contacts the braking annular ring when the rotor is lowered or otherwise dropped from the vertical position. The controller performs operations to provide control signals to provide first power to the magnetic system to hold the rotor in the vertical position and provide second control signals to provide second power to the magnetic system to lower the rotor.

The flywheel device includes a sealed housing section; a rotor located in the sealed housing section where the rotor is held in a vertical position by a magnetic system; a controller coupled to the magnetic system; and a braking annular ring mounted to the sealed housing section below the rotor, where the rotor contacts the braking annular ring when the rotor is lowered or otherwise dropped from the vertical position. The controller performs operations to provide control signals to provide first power to the magnetic system to hold the rotor in the vertical position and provide second control signals to provide second power to the magnetic system to lower the rotor.

A brake dust cover is disposed between a non-rotating body rotatably supporting an axle and a disc rotor rotating together with the axle so as to cover the disc rotor from an inner side in a vehicle width direction. The brake dust cover includes a first plate-like member having a C-shape in which a part of a circular ring is cut out, and a second plate-like member coupled to the first plate-like member. The second plate-like member includes a fixed portion fixed to the non-rotating body, and a plurality of support portions extending radially from the fixed portion. The first plate-like member is coupled to the second plate-like member to overlap the support portions such that an opening portion is formed between an inner edge of the first plate-like member and an outer edge of the fixed portion of the second plate-like member when viewed in the vehicle width direction.

A brake dust cover is disposed between a non-rotating body rotatably supporting an axle and a disc rotor rotating together with the axle so as to cover the disc rotor from an inner side in a vehicle width direction. The brake dust cover includes a first plate-like member having a C-shape in which a part of a circular ring is cut out, and a second plate-like member coupled to the first plate-like member. The second plate-like member includes a fixed portion fixed to the non-rotating body, and a plurality of support portions extending radially from the fixed portion. The first plate-like member is coupled to the second plate-like member to overlap the support portions such that an opening portion is formed between an inner edge of the first plate-like member and an outer edge of the fixed portion of the second plate-like member when viewed in the vehicle width direction.

A magnetic brake for a motor uses the magnetic force on the surface of a flux concentrating rotor to pull a flexible brake spring or friction sheet into friction contact with the rotor. An electromagnetic stator pulls the flexible brake spring or friction sheet away from the rotor when it is energized. The brake spring may be a variable thickness around the circumference in a radial flux motor or radially in an axial flux motor and is thicker near where it is fixed to the housing. The brake spring may be split so it can clamp down on the rotor symmetrically. The OD of the brake spring may be closer to the surrounding stator near the fixed section of the brake spring so the air gap to the brake stator is smaller and the gap to the rotor and the ID of the brake spring is larger to allow the brake stator to pull on this area with greater force initially when it is energized to disengage the brake.

A caliper bracket of a vehicle disk brake includes an axle coupling part, an extension part, a caliper attaching part and a swing arm coupling part. The axle coupling part is disposed on an opposite side to a disk rotor and is attached to a rear wheel axle passing through a center of the disk rotor. The extension part is extending from the axle coupling part. The swing arm coupling part is provided on the other side part of the extension part in the longitudinal direction and is coupled to a swing arm. The extension part is formed to linearly extend from the axle coupling part, and the swing arm coupling part is formed to have a cuboid shape protruding toward the opposite side to the disk rotor and capable of fitting with a coupling groove member provided for the swing arm.

A drive device for driving and rotating a wheel includes an axle shaft, a hub to which rotation of the axle shaft is conveyed, a plurality of fasteners for securing the wheel to the hub, a wet brake, a housing, an oil seal, and a cover. The wet brake is configured to restrain the rotation of the axle shaft. The housing accommodates the axle shaft and the wet brake. The oil seal is disposed between the housing and a part of the hub that is disposed inward of the fasteners in a radial direction of the hub. The cover has an annular shape. The cover is disposed in a space formed between the hub and the housing, and is secured to the housing. The cover is configured to cover the plurality of fasteners.

A brake dust cover includes an annular plate in which a cutout for avoidance of a brake caliper is provided in a first predetermined angle region, and a cover portion that overhangs to one side in an axial direction of the annular plate and covers an outer peripheral surface of a brake disc rotor is included at an outer periphery of a second predetermined angle region. The annular plate includes a small diameter region disposed in a third predetermined angle region other than the second predetermined angle region. In the annular plate, an outer diameter of the third predetermined angle region is smaller than an outer diameter of the second predetermined angle region. The annular plate does not include, in the small diameter region, a portion that overhangs to one side in the axial direction of the annular plate and covers the outer peripheral surface of the brake disc rotor.