Abstract: A heat dissipation system of an electronic device including a body, a plurality of heat sources disposed in the body, and at least one centrifugal heat dissipation fan disposed in the body is provided. The centrifugal heat dissipation fan includes a housing and an impeller disposed in the housing on an axis. The housing has at least one inlet on the axis and has a plurality of outlets in different radial directions, and the plurality of outlets respectively correspond to the plurality of heat sources.

Abstract: A centrifugal heat dissipation fan including a housing and an impeller disposed in the housing on an axis is provided. The housing has at least one inlet on the axis and has a plurality of outlets in different radial directions. A heat dissipation system of an electronic device is also provided.

Abstract: The present invention provides a method for preparing aqueous emulsion via water dispersible polyurethane grafted acrylate copolymerization, which first uses 2-8 wt % of isocyanate, 7-15 wt % of a polyol, 0.3-1.0 wt % of a polyol bearing hydrophilic carboxylic monomer, and 0.1˜2.0 wt % of an acrylic ester containing a hydroxyl group to cause a reaction and form an unsaturated double bond bearing polyurethane prepolymer, the NCO content of which is approximately 2˜8%. This is followed by introducing 0.3-1.0 wt % of an alkalic neutralizer to carry out a neutralization reaction, and then 25-40 wt % of pure water is used to effect water dispersion, after which 0.1˜0.5 wt % of a chain extender is added to form an ethylenically unsaturated water dispersible polyurethane prepolymer. A reaction system is formed by adding 40-60 wt % of deionized water, 20˜30 wt % of methyl methacrylate or an acrylate monomer to the ethylenically unsaturated water dispersible polyurethane prepolymer, and 0.1˜2.

Abstract: A hydraulic brake controller does not only dispose a first oil-return hole, which is connected to an oil storing space, at a stroke place of allowing a piston to reciprocate in a main oil cylinder, but also disposes a regulating screw, which stretches the first oil-return hole, on a controller main body. The speed of returning hydraulic oil to the oil storing space can be controlled by simply changing the degree of the regulating screw stretching the oil-return hole so that time of allowing the piston passing through the oil-return hole to completely impose the braking force on the brake pad can be extended or reduced, thereby achieving a goal of conveniently regulating the braking sensitivity.

Abstract: A brake master cylinder of the invention is to dispose a main oil cylinder and an oil storing space on a handlebar base. In addition, a sleeve engaged with the main oil cylinder is disposed in the oil storing space. The one end of the oil storing space has a fastening seat passed by a draw bar linked to the brake handlebar, and a positioning sheath of the fastening seat is utilized to engage with the sleeve. A leakage prevention component is disposed between the fastening seat and the handlebar base. A bushing integrally extended from the leakage prevention component is utilized to encapsulate the positioning sheath of the fastening seat and the sleeve. Accordingly, the brake master cylinder having convenient assembly and better sealing effect for hydraulic oil is obtained.

Abstract: A brake master cylinder of the invention is to dispose a main oil cylinder and an oil storing space on a handlebar base. In addition, a sleeve engaged with the main oil cylinder is disposed in the oil storing space. The one end of the oil storing space has a fastening seat passed by a draw bar linked to the brake handlebar, and a positioning sheath of the fastening seat is utilized to engage with the sleeve. A leakage prevention component is disposed between the fastening seat and the handlebar base. A bushing integrally extended from the leakage prevention component is utilized to encapsulate the positioning sheath of the fastening seat and the sleeve. Accordingly, the brake master cylinder having convenient assembly and better sealing effect for hydraulic oil is obtained.

Abstract: A hydraulic brake controller does not only dispose a first oil-return hole, which is connected to an oil storing space, at a stroke place of allowing a piston to reciprocate in a main oil cylinder, but also disposes a regulating screw, which stretches the first oil-return hole, on a controller main body. The speed of returning hydraulic oil to the oil storing space can be controlled by simply changing the degree of the regulating screw stretching the oil-return hole so that time of allowing the piston passing through the oil-return hole to completely impose the braking force on the brake pad can be extended or reduced, thereby achieving a goal of conveniently regulating the braking sensitivity.

Abstract: A brake shoe return mechanism applied in a bike or motor vehicle has a gap disposed each on both sides of a brake lining of each brake shoe, and a lug is disposed at each arm extending from a return spring to both sides of the brake lining to penetrate into the gap for securing the spring in place to avoid mal-position of the return spring and ensuring normal operation of the brake.

Abstract: A brake drawing system applied in bikes and any motor vehicle provided with handbrake and pedal driven brake operates by having a pull rod to drive a push rod to engage in linearly reciprocal motion for activating the brake; a brake lever pin on the pull rod constituting transmission between push rod and pull rod; the push rod penetrating an adjustment bushing on the brake lever pin to adjust brake openness by changing relative positions between sleeve and brake lever pin without interfering with the push rod to maintain pull rod openness as adjusted.