Abstract: A cylinder liner capable of oil storage and lubrication used for a model engine is provided. The cylinder liner is disposed in a cylinder of the model engine. A piston is provided in the cylinder liner to reciprocate axially. The inner wall of the cylinder liner is honed to form a plurality of grooves. The inner wall of the cylinder liner is further formed with at least one grooved trough. The grooved trough is adapted to store an oil film to provide a lubrication effect between the piston and the cylinder liner during the reciprocation of the piston. The present invention enhances the protection for the piston and the cylinder liner and lowers the temperature during the running of the model engine. The piston can be reciprocated smoothly for a long time at a high speed so as to enhance the efficiency and service life of the engine.

Abstract: An electric starting device for a gasoline engine includes a clutch, an adapter and a motor. The clutch further provided with a flail block seat and a flail block seat. The flail block seat is pivotally disposed with flail blocks able to be optionally engaged in the starting claw, while the starting claw is combined with the motor via the adapter and the flail block seat is to be combined with the crankshaft of an engine. Thus, the motor can be started to drive the crankshaft to rotate through the clutch for starting the engine and when the engine is started to operate, the centrifugal force produced by rotation of the crankshaft will force the flail blocks to disengage from the starting claw and hence, the starting claw, the adapter and the motor will be disconnected from the crankshaft, able to effectively lower load of the engine and reduce power consumption.

Abstract: A heat dissipation type starting fly wheel of a model vehicle gasoline engine includes a main body formed with a through hole in the center and having its outer circumferential side annularly provided with a protruding ring, which has one side fixed thereon with a plurality of blades. Thus, when driven to rotate, the main body and the protruding ring will produce an effect of a fly wheel, and when rotated, the blades on the protruding ring will disturb air to form air convection, able to attain an object of enhancing heat dissipation efficacy of the model vehicle gasoline engine.

Abstract: A combustion chamber structure by using a preheating net and a spark plug to ignite includes a cylinder. The cylinder is connected with a connection seat. The connection seat has a threaded hole. A spark plug is fixedly connected in the threaded hole. A preheating net is transversely disposed under the spark plug. A certain distance is defined between the spark plug and the preheating net. When electrified, the spark plug and the preheating net will generate an electric arc to rise the temperature of the preheating net and to preheat the mixing oil gas in the combustion chamber. The present invention enhances the burning efficiency. The oil gas in the combustion chamber is complete combustion to enhance horsepower and to save oil. Besides, the present invention can decrease the exhaust gas so it is environment-friendly.

Abstract: An oil collection and forced lubrication structure of a model engine has an oil-collecting groove provided at a circumferential wall of a passageway of a crankshaft body. The oil-collecting groove is disposed with a lubrication hole extending to pass through a projecting shaft of the crankshaft body. Thus, when oil gas gets into the passageway of the crankshaft body, the oil gas will be cast by the centrifugal force produced by rotation of the crankshaft body and attached on the circumferential wall of the passageway to be collected and pre-stored in the oil-collecting groove. Then, the oil gas will be cast to the outer circumference of the projecting shaft via the lubrication hole to produce forced lubrication effect between the projecting shaft and a piston rod, thus enhancing lubrication effect, enabling the crankshaft to rotate smoothly and elevating engine efficiency.

Abstract: A model engine carburetor capable of adjusting oil automatically when decelerating is mounted on a model engine. The model engine carburetor has a first adjustment room and a second adjustment room. The first adjustment room and the second adjustment are separated by an elastic membrane. When the model engine is decelerated at a very short time from a high speed, the model engine will generate negative pressure to draw out the air in the first adjustment room and the elastic membrane will be deformed to generate vacuum suction. The overmuch fuel oil is drawn to the second adjustment room to adjust the ratio of the oil gas. The model engine can run smoothly when the speed is decelerated at a very short time.

Abstract: A braking ratio device for a remote control model is composed of a suspending arm and a ratio device. The suspending arm is fixed with a shaft of a servo motor, having a controlled member formed at its one side and a driving member extended out from one end of the controlled member. The ratio device is provided with a pivotal base pivotally mounted on the controlled member, and a ratio base connected with the pivotal base to be able to move axially. A front brake connecting rod and a rear brake connecting rod are respectively inserted through two sides of the ratio base, to alter the distance between the front brake connecting rod and a front braking set, and also the distance between the rear brake connecting rod and a rear braking set, for creating a time difference of braking for the front and the rear braking sets.

Abstract: A carburetor of a remote control model has a main body axially bored with an axial hole that is installed with a throttle and a second needle in its one side and provided with a female-threaded section formed at a certain portion of its other side for engaging with a male-threaded section of an adjustment valve. The adjustment valve possesses a fuel entering passage formed axially with a dead end, and an injection nozzle formed at the end corresponding to and for a needle valve of the second needle to move to and fro therein. And, the adjustment valve is directly installed in the axial hole without being accompanied with other components, effective to lower progressive tolerance between the injection nozzle and the needle valve to provide uniform fuel injection.

Abstract: A fixing and combining device for the brake disc of a remote-controlled model car includes a connecting cup and a brake disc. The connecting cup has one side provided with a cup-shaped transmission member having two opposite sides of its circumferential wall respectively cut with an engage notch for receiving transmission rod therein. The brake disc is bored with a center hole matching with the transmission member and having the opposite sides of its inner annular edge formed with at least two combining projections to be respectively combined with the inner sides of the two engage notches of the connecting cup after the transmission member is inserted through the center hole of the brake disc. Thus, the brake disc can be tightly fixed between the engage notches of the connecting cup and the transmission rod by the combining projections.

Abstract: A starting device for a model engine includes an electric-operation unit and a rope-operation unit. The electric-operation unit consists of an engage wheel having engage teeth elastically engaged thereon, and a starting shaft slidably fitted at the outer side of the engage wheel. The starting shaft has its inner side bored with a fitting slot having its circumference eccentrically cut with plural arc-shaped grooves matching with the engage teeth of the engage wheel. The arc-shaped grooves of the starting shaft can eccentrically actuate the engage teeth to move back and forth axially on the engage wheel. The rope wheel of the rope-operation unit is fitted on the starting shaft, having its inner side equidistantly and annularly bored with plural tooth grooves elastically engaged by the engage teeth. By changing the positions of the engage teeth, the starting device can be started in two different modes.

Abstract: A shock absorber for a remote-controlled model car includes a sealing member fixed on the topside of a piston. The sealing member has two opposite flexible portions respectively matching with the flow-guiding holes of the piston, with flow gaps formed between the flexible portions and the upper outer sides of the piston. The flow gap, matching with the extent of an external force imposed upon the shock absorber, can be properly diminished or closed up. Each flexible portion is bored with a flow-adjusting hole smaller than and aligned to the flow-guiding hole of the piston for reducing the flow amount of liquid oil flowing through the flow-guiding hole. When pressed by different-extent external forces, the shock absorber can automatically adjust its buffering force to an excellent condition by adjustment of the flow-adjusting holes and the flow gaps.

Abstract: A special tool for assembling and disassembling a remote-controllable model-car engine clutch has a head, and a prying claw formed to extend up from the head. The prying claw has an engage groove laterally in an upper section and a pushing groove formed in an upper end surface. The engage groove of the prying claw pries open a torsion spring of each of plural grasps of a clutch for disassembling each grasp from a base fixed with an engine. The pushing groove of the prying claw pries open the torsion spring and then assembles each grasp of the clutch one by one on the base. The special tool has double functions, lowering its cost and package and facilitating handling of assembly and disassembly of an engine clutch.