Abstract: The bearing mainly includes an inner groove and at least a passage. The groove is arranged on an inner surface of the bearing and connected with a reservoir on one end of the bearing by the passage to induce the outflow lubricant backflow to the groove.

Abstract: A self-lubricating bearing includes an axle hole having a first section and a second section. The first section includes a first inner transverse length and the second section includes a second inner transverse length that is greater than the first inner transverse length. The second section is contiguous to at least one of two end faces of the self-lubricating bearing. A self-lubricating bearing assembly is constructed by a plurality of self-lubricating bearings that are stacked one another. The difference between the first inner transverse length and the second inner transverse length provides an oil-storing compartment for the lubricating oil.

Abstract: A shaft supporting structure for an axial fan includes a base and a casing. Electronic control elements are provided for driving the fan wheel under byvirtue of the induction of a coil. The fan wheel includes blades and a magnet ring that can be inducted for driving a central shaft thereof. The central shaft includes two ends that are respectively supported in an arcuate recess of a support member in the base and an arcuate recess of another support member in the casing.

Abstract: A control circuit for controlling the rotational speed of a heat-dissipation fan for an electronic device, the circuit including a temperature sensing circuit for sensing the ambient temperature of the device and providing a temperature signal, a comparator circuit for receiving the temperature signal and for comparing it with a predetermined threshold, and a drive circuit for receiving the comparison signal and for controlling the rotational speed of the fan so that, when the ambient temperature is above the threshold, the speed changes substantially linearly with respect to the difference between the ambient temperature and the threshold and, when the ambient temperature is below the threshold, the fan is stopped.

Abstract: A collapsible sunshade includes a frame and a top cover which is mounted on the frame. The frame includes a shaft which has an outer tube and an inner tube that is telescopically inserted into the outer tube. A runner assembly is sleeved on the outer tube. A main rib assembly is pivoted to a top end of the inner tube for mounting the top cover. A collapsible stretcher assembly is pivoted to the main rib assembly and is connected to the runner assembly. The runner assembly can cooperate with a bottom end of the inner tube so as to move the inner tube upward and outward from the outer tube simultaneously with the stretching of the main rib assembly. Preferably, the main rib assembly is collapsible, and has pivot connectors that impede the collapsing of the main rib assembly.