A braking structure for fan includes a fan and a braking device connected to the fan. The braking device includes a first braking mechanism, a second braking mechanism and a support seat. The first braking mechanism is connected to a free end of a shaft of the fan, the second braking mechanism is fitted in the support seat, and the support seat is engaged with a bottom of a frame of the fan. When the fan is turned off, the braking device is no longer energized, bring the first and the second braking mechanism to engage with each other and accordingly produce a braking effect, so that the fan can more quickly stop rotating.

A caster brake device includes a brake gear, receiving unit, driving unit, elastic element and operating unit connected to the driving unit. The brake gear is disposed at an axle or wheel of a mobile carrier. Stop slots are disposed at the brake gear circumferentially. The receiving unit has a penetrating recess corresponding in position to the stop slots. The driving unit is disposed in the receiving unit and includes a penetrating portion corresponding in position to the penetrating recess and a stop spindle penetrating the penetrating recess and the penetrating portion. Two ends of the stop spindle correspond in position to the stop slots and thus are movably confined to the penetrating recess to enter or exit the stop slots. The elastic element has two ends abutting against the receiving unit and driving unit, respectively, to enable the stop spindle to undergo reciprocating motion within the penetrating recess.

A linear guide system has at least a first rail element and a second rail element, which are mounted to be linearly slidable opposite one another in and counter to an extraction direction, a linear drive, which includes a rotatable drive shaft and an electric motor configured for the transmission of a torque to the drive shaft. The linear drive is configured such that a rotational movement of the drive shaft causes a linear movement of the first and second rail elements relative to one another in or counter to the extraction direction. A locking element is provided, which can be set and reset between an unlocked position and a locked position, which, for blocking the rotational movement of the drive shaft in the locked position, is configured so as to engage in a form-locking or force-locking manner with an engaging element connected to the drive shaft in a rotationally fixed manner or configured as a portion of the drive shaft. An actuator is provided, which is configured for setting the locking element towards the engaging element from the unlocked position into the locked position, as well as for resetting the locking element from the locked position into the unlocked position.

This concept has addressed the brake dust emission and the brake drag issues by introducing a pushback ring (press-fit on the brake piston) which pushes against the brake piston dust shield (or another elastic element if needed) when brake fluid pressure is created, thus accumulating a reactive force which is used to bring the brake piston to its original position when the brake fluid pressure is released and considerably reduce or eliminate the brake drag and the brake dust emission of any automobile in order to improve the fuel/energy consumption.

A disc brake, a wear adjuster for a disc brake and a method for operating a disc brake are provided. The wear adjuster includes a pawl biased by a spring against, and actuated by, a rotary lever, a shaft with the ratchet wheel arranged to be rotated by the pawl when the rotary lever rotates in a brake release direction, and a tappet wheel threaded on a brake application tappet supported on a movable bridge in the disc brake caliper. During brake release the pawl rotates the ratchet wheel and the shaft. The shaft and the tappet wheel have gearing which rotates the tappet wheel with the shaft. Due to the threaded engagement of the tappet wheel and the non-rotating tappet, the rotating tappet wheel causes the tappet to advance relative to the bridge to compensate for brake pad wear.

A retraction spring comprising: (a) a body portion; (b) a first end; and (c) a second end, the second end connected to the first end via the body portion, wherein the retraction spring is configured to connect between mounting points of a caliper housing and attachment points along a bottom peripheral edge of one or more brake pad assemblies.

A brake pad retractor system, comprising, a torsional mount and a torsion arm having an angular relation with the torsional mount, wherein the torsion arm is sprung responsively to at least some movement of a brake pad and the torsional mount being operative such that upon movement of a brake pad by a first distance, the torsion arm is sprung and communicates an action upon the brake pad through a contact between the torsion arm and the brake pad, the communicated action sufficient to positively retract the brake pad upon release of the brake system, the torsional mount further operative such that upon further movement of a brake pad beyond the first distance the angular relation between the torsion arm and the torsional mount is adjusted responsively to the further movement. Further aspects include a novel a brake caliper and method.

A screw actuator comprises a screw shaft for threaded engagement with an actuator output device such that rotation of the screw shaft causes linear movement of the actuator output device; and a motor for driving rotation of the screw shaft. A no-back device is included for restricting movement of the screw shaft in response to feedback torque applied due to external forces on the actuator output device.

A power delivery device configured for an automatic transmission may include a brake disposed between a rotation element connected to a brake hub and a transmission housing, and a piston device disposed corresponding to the brake and operating the brake by hydraulic pressure, wherein the power delivery device configured for an automatic transmission selectively connects the rotation element to the transmission housing by use of dual pistons.

A caster brake device includes a brake gear, receiving unit, driving unit, elastic element and operating unit connected to the driving unit. The brake gear is disposed at an axle or wheel of a mobile carrier. Stop slots are disposed at the brake gear circumferentially. The receiving unit has a penetrating recess corresponding in position to the stop slots. The driving unit is disposed in the receiving unit and includes a penetrating portion corresponding in position to the penetrating recess and a stop spindle penetrating the penetrating recess and the penetrating portion. Two ends of the stop spindle correspond in position to the stop slots and thus are movably confined to the penetrating recess to enter or exit the stop slots. The elastic element has two ends abutting against the receiving unit and driving unit, respectively, to enable the stop spindle to undergo reciprocating motion within the penetrating recess.