Abstract: A parking brake and shift mechanism for vehicles comprises a transmission shaft, a parking shift gear wheel, a stopper, and a dog clutch. The parking shift gear wheel is provided with at least one tooth to move in conjunction with the axis of the transmission shaft. The stopper is provided with at least one groove which contains the tooth. The dog clutch is fixed on the transmission shaft and provided with at least one concavity for accommodating the tooth.

Abstract: An automatic gear transmission apparatus, capable of cooperating with a conventional manual transmission gearbox to provide an automatic gear transmission function. The automatic gear transmission apparatus comprises: a motor, a clutch mechanism, a gear selection mechanism, a gear transmission mechanism, and a sleeve rod. By operation of the clutch mechanism, output power from a single motor can be optionally transmitted out through the gear selection mechanism or the gear transmission mechanism. The power output by the gear selection mechanism can linearly activate the sleeve rod to proceed a gear selection action, while the power output by the gear transmission mechanism can rotationally activate the sleeve rod to proceed a gear transmission action. Therefore, using only a single motor can drive the sleeve rod linearly or rotationally to proceed two actions of gear selection and gear transmission, respectively.

Abstract: An automatic gear transmission apparatus, capable of cooperating with a conventional manual transmission gearbox to provide an automatic gear transmission function. The automatic gear transmission apparatus comprises: a motor, a clutch mechanism, a gear selection mechanism, a gear transmission mechanism, and a sleeve rod. By means of the clutch mechanism, output power from a single motor can be optionally transmitted out through the gear selection mechanism or the gear transmission mechanism. The power output by the gear selection mechanism can linearly activate the sleeve rod to proceed a gear selection action, while the power output by the gear transmission mechanism can rotationally activate the sleeve rod to proceed a gear transmission action. Therefore, using only a single motor can drive the sleeve rod linearly or rotationally to proceed two actions of gear selection and gear transmission, respectively.

Abstract: A lubricating device for four-stroke engine consists of a cylinder block, a crankcase, an oil sump, a piston, a crankshaft, a connecting rod and an oil dipper, the crankcase contains an upper crankcase body and a lower crankcase body, the bottom of the crankcase extends downward to form an oil trough with a hole in it, an oil dipper is able to operate in the oil trough, an oil box is formed for oil containing by the lover crankcase body and the oil sup, when an engine is running on a normal inclination, a shall amount of oil can only get into the oil trough through three hole in it, movement of the oil dipper atomizes the oil to provide lubrication, if the engine is running on an abnormal inclination or bumping condition, oil will not flow into the crankcase, and this design is able to ensure nor-al operation of an engine on any inclinations.

Abstract: A two-speed gearbox, having an input shaft which is connected to a spline shaft, when the gearbox is in direct drive, a front part of the spline shaft is in engagement with a shaft coupler which drives an output shaft to transmit a 1:1 ratio; when the gearbox is geared down, the spline shaft is moved such that its front part is separated from the shaft coupler and engaged with a sun gear of the planetary gear train within a housing which makes the internal splines of a frame of the planetary gear engage with external splines of the shaft coupler. Power is transmitted from the spline shaft, through the speed reduction of the sun and planetary gear train and to the planetary gear frame, and then is transmitted to the shaft coupler and sent out through the output shaft.