Disclosed herein is a hydraulic master cylinder body having a bore defined at least in part by a bore wall, wherein the bore wall includes an opening for hydraulic fluid to be passed into the bore, and a piston assembly situated at least substantially in the bore, the assembly having a piston with a piston body and at least one cup seal situated substantially around the piston body, the cup seal situated adjacent to the bore wall so as to be in sealing engagement therewith, and a back-up ring that is situated about the piston body, wherein the back-up ring is positioned to at least partially cover a portion of the cup seal that is adjacent to the bore wall and to prevent at least a portion of the cup seal from contacting the bore wall and the opening for hydraulic fluid during piston actuation.

The hydraulic actuator comprises: a hydraulic input cylinder having an input piston; a hydraulic output cylinder, which is hydraulically coupled to the input cylinder; and a pressure-limiting valve, which limits the output cylinder with respect to pressure in dependence on the usability of a force on the input piston. The method is a method for operating such a hydraulic actuator, wherein the drive actuator is deflected with deflections having a deflection duration at a deflection frequency for the duration of an acting or a non-acting phase of the hydraulic actuator, wherein the deflection duration defines a movement stiffness of the hydraulic actuator and the deflection frequency defines the resulting deflection speed of the hydraulic actuator.

The hydraulic actuator comprises: a hydraulic input cylinder having an input piston; a hydraulic output cylinder, which is hydraulically coupled to the input cylinder; and a pressure-limiting valve, which limits the output cylinder with respect to pressure in dependence on the usability of a force on the input piston. The method is a method for operating such a hydraulic actuator, wherein the drive actuator is deflected with deflections having a deflection duration at a deflection frequency for the duration of an acting or a non-acting phase of the hydraulic actuator, wherein the deflection duration defines a movement stiffness of the hydraulic actuator and the deflection frequency defines the resulting deflection speed of the hydraulic actuator.

A bicycle operating device comprises a base, an operating member, a hydraulic cylinder, a piston, a connecting link, and a guiding structure. The operating member is pivotally coupled to the base. The hydraulic cylinder is mounted to the base. The piston is movably provided in the hydraulic cylinder. The connecting link is pivotally coupled to each of the operating member and the piston to move the piston relative to the hydraulic cylinder in response to a pivotal movement of the operating member relative to the base. The guiding structure is coupled to the piston to guide the piston relative to the base.

A bicycle operating device comprises a base, an operating member, a hydraulic cylinder, a piston, a connecting link, and a guiding structure. The operating member is pivotally coupled to the base. The hydraulic cylinder is mounted to the base. The piston is movably provided in the hydraulic cylinder. The connecting link is pivotally coupled to each of the operating member and the piston to move the piston relative to the hydraulic cylinder in response to a pivotal movement of the operating member relative to the base. The guiding structure is coupled to the piston to guide the piston relative to the base.

A hydraulic system for driving a post driver of a skid steer loader. The hydraulic system includes a master cylinder disposed between a valve, such as a 4-way valve, and the driver cylinder of the post driver. The master cylinder effectively provides that hydraulic fluid from the 4-way valve to the hydraulic system of the skid steer loader can flow freely without needing an auxiliary pump and motor to overcome resistance in the return line back to the skid steer loader hydraulic system. By eliminating the restriction in the return line of the driver cylinder, a very fast retraction can be achieved, improving the impact performance of the system.

A hydraulic system for driving a post driver of a skid steer loader. The hydraulic system includes a master cylinder disposed between a valve, such as a 4-way valve, and the driver cylinder of the post driver. The master cylinder effectively provides that hydraulic fluid from the 4-way valve to the hydraulic system of the skid steer loader can flow freely without needing an auxiliary pump and motor to overcome resistance in the return line back to the skid steer loader hydraulic system. By eliminating the restriction in the return line of the driver cylinder, a very fast retraction can be achieved, improving the impact performance of the system.

System for supplying hydraulic pressure to a bolt elongation tool, comprising the bolt elongation tool with at least one pressure chamber and a tool piston, a hydraulic medium supply system and a hydraulic actuator with an actuator cylinder housing an actuator piston. The actuator cylinder is attached to the at least one pressure chamber, wherein the hydraulic actuator is an electro-hydraulic actuator comprising an electric motor built to generate the power of the electro-hydraulic actuator, and wherein the actuator piston is built to supply, with one stroke of an actuator stroke height of the actuator piston, at least the amount of hydraulic pressure that is needed to move the tool piston for the amount of one tool stroke height of the tool piston.

A non-metallic bracket for a bicycle hydraulic component is basically provided with a non-metallic body and a force receiving member. The non-metallic body has a hydraulic hose attachment port and an internal fluid passage. The hydraulic hose attachment port has an insertion opening disposed at an exterior surface of the non-metallic body and an internal attachment bore extending from the insertion opening towards the internal fluid passage. The internal attachment bore of the hydraulic hose attachment port includes an internal screw thread portion that threadedly receives a hose fastening fitting. The force receiving member is provided to the non-metallic body so as to receive force applied to the non-metallic body in an area of the hydraulic hose attachment port caused by screwing the hose fastening fitting into the internal screw thread portion of the non-metallic body.

A non-metallic bracket for a bicycle hydraulic component is basically provided with a non-metallic body and a force receiving member. The non-metallic body has a hydraulic hose attachment port and an internal fluid passage. The hydraulic hose attachment port has an insertion opening disposed at an exterior surface of the non-metallic body and an internal attachment bore extending from the insertion opening towards the internal fluid passage. The internal attachment bore of the hydraulic hose attachment port includes an internal screw thread portion that threadedly receives a hose fastening fitting. The force receiving member is provided to the non-metallic body so as to receive force applied to the non-metallic body in an area of the hydraulic hose attachment port caused by screwing the hose fastening fitting into the internal screw thread portion of the non-metallic body.