China Motorcycles Suppliers,Electric Bikes and Agricultural Appliances Manufacturers

The motorcycle's transmission system consists of primary deceleration, clutch, gearbox, and secondary deceleration.

1.primary deceleration

The primary deceleration consists mainly of the drive sprocket (drive gear) mounted on the crankshaft end, the sleeve roller chain and the driven sprocket (driven gear) on the clutch as a deceleration and transmits the engine power to the clutch.

2.clutch

Motorcycle clutches have the following types of construction:

(1) The wet multi-plate friction clutch clutch assembly is immersed in the oil to be divided into three parts: active, driven and separated. The power of the engine is driven by a sprocket-type gear drive, and the periphery of the cover is grooved. Five friction plates (active sheets) embedded with rubber cork friction material are placed, and the outer edge of the bump is placed in the groove of the active cover. Rotate as one of the active parts of the clutch. The four steel driven pieces are connected to the driven piece fixing basin through the internal teeth to form a driven portion. The main and driven pieces are staggered, and the fixed basin is connected to the gearbox main shaft by internal splines. The four clutch springs on the gland press the friction plate and the driven piece to transmit the power to the gearbox. The clutch is normally engaged. When the clutch lever is tightened by the cable to rotate the screw sleeve in the left cover, the adjusting screw in the screw sleeve moves to the right, pushing the separation push rod and the gland, the spring pressure disappears, the friction sign and the follower piece Separation.

(2) Automatic centrifugal clutch This structure is used on mopeds such as Yamaha CY80 and Suzuki FR50 to automatically control the separation and engagement of the clutch according to the engine speed. The clutch consists of an active, driven and disengaged engagement mechanism. The active part is composed of a clutch cover, a thrust piece, a clutch plate and the like. The driven part is composed of a friction plate, a center sleeve and the like. When the engine is running, as the rotation speed increases, the centrifugal force generated by the steel ball also increases, and the axial component force overcomes the tension of the separation spring to move outward along the groove in the clutch housing, and the compression thrust piece is tightly pressed. Pressing the clutch plate and friction causes the clutch to be engaged, and the power is output. When the engine speed is reduced to 怠 or flameout, the centrifugal force of the steel ball is reduced or not. The tension of the separation spring overcomes the centrifugal force of the steel ball to return the steel ball to the original position along the groove, and the clutch is separated.

https://www.zhenhuagm.com/

The start of the motorcycle is mainly based on the starting method of the ankle. The starting mechanism has a sector gear starting mechanism. The pedal starting shifting lever drives the sector gear, the starting ratchet, the clutch assembly sprocket, the front chain, the crankshaft sprocket to drive the crankshaft to rotate, and start the engine.

When the engine is started, the starting mechanism is restored to the original position by the one-way action of the starting ratchet and the action of the return spring. In this starting mechanism, the starting shift lever is turned to the neutral position when starting, and the pedal can be started by pressing the pedal.

The other is a starter mast starter used in some imported models. Different from the former, the clutch handlebar must first be pinched when starting, so that the clutch can be disengaged. The shift lever can be placed in any grade position. It is not necessary to put it in the neutral position.

 After starting, the clutch can be released and the throttle can be started. When the starting mast is pressed, the pawl on the starting mast shaft meshes with the inner ratchet of the starting mast transmission gear to rotate the transmission gear, and the crankshaft rotation is driven by the idle gear, the driven gear, the clutch gear, and the start pinion. Start the engine. After starting, the foot leaves the starting mast, and the return spring rotates the mast in the opposite direction, and the pawl disengages from the inner ratchet to restore the original position. Motorcycles with a large displacement are started by a starter motor.

https://www.zhenhuagm.com/

In some two-stroke motorcycle engines, in order to avoid the back spray phenomenon of the carburetor at low speed, a one-way reed valve for controlling the intake air is installed between the carburetor and the cylinder block. The reed is made of thin spring steel sheet, the valve seat is made of aluminum alloy, and the air inlet is opened. The air inlet surface and the reed contact part are pasted with a layer of oil rubber to reduce the impact and vibration of the reed and the valve seat. . When inhaling, a certain degree of vacuum is formed in the crankcase. Under the action of the pressure difference, the reed valve opens the mixed gas into the crankcase. When the piston descends, the air inlet is not opened, and the pressure in the crankcase rises. The valve is closed to prevent the backflow of the mixture, which improves the power and economy of the engine at low speed.

Lubrication system

The four-stroke engine uses a combination of splash lubrication and pressure lubrication. Two-stroke engines generally use a hybrid lubrication method in which gasoline is mixed with a certain proportion of QB gasoline engine oil. However, this kind of slip-type mixed oil is supplied to the slip oil in a predetermined proportion regardless of the operating conditions of the engine, which increases the consumption of the lubricating oil, incomplete combustion, more carbon deposit, and exhaust pollution. The new generation of two-stroke engines are split and slippery, with separate oil and oil pumps.

The oil pump generally adopts a reciprocating plunger type variable oil supply oil pump, which is driven by a crank gear through a worm wheel and a worm. The oil supply is linked by the throttle handle, the control cable and the carburetor throttle valve, so that the oil supply varies with the engine speed. At high speed, the oil supply is high, the oil supply is low at low speed, the oil supply is reasonable, and the mixing is smooth. Compared with the way, it can save more oil. The oil is blown into a small oil mist by the high-speed mixed gas, and is supplied to the part that needs to be smoothed, and the oil that enters the combustion chamber is reduced, the mixed gas is completely burned, and the carbon deposit and the exhaust pollution are reduced.

https://www.zhenhuagm.com/

The crankshaft of the motorcycle engine is a combination of a left half crankshaft, a right half crankshaft and a crank pin. A ball bearing is mounted on the main journal of the left and right shafts for supporting the crankshaft on the crankcase. The two ends of the crankshaft are respectively equipped with a flywheel, a magneto, and a clutch driving gear. The connecting rod has a monolithic structure, and the large end is annular, and a needle bearing and a crank pin are combined to form a crank connecting rod set. In the two-stroke engine, when installing the piston ring, pay attention to align the opening of the piston ring with the positioning pin in the piston ring groove to prevent the piston ring from rotating in the ring groove, causing air leakage and scratching the inlet and the row on the cylinder liner. Air port.

The carburetor is an important component of the motorcycle fuel supply system and is located between the air filter and the engine intake. Generally, the motorcycle engine adopts a flat suction type for the intake air flow direction, and the throttle valve is a plunger type and a float chamber type carburetor. The carburetor structure is mainly composed of two parts: a float chamber and a mixing chamber. The float chamber is located below the carburetor, and the oil pipe is passed through the throttle switch to the fuel tank. The needle valve on the float is used to maintain a certain height of the oil level in the float chamber, so that the oil supply pressure is stabilized. The function of the mixing chamber is to combine the gasoline vaporization and air to allow the engine to obtain the desired mixture at various loads and speeds. It consists of a festival valve, a fuel injection needle, a fuel injection pipe, and a gas and oil passage.

Through the rotation of the throttle handle of the motorcycle, the throttle wire rope is operated to move the throttle valve and the fuel injection needle up and down, and the cross section of the intake pipe and the oil supply amount are changed to meet the needs of the mixed gas under different rotation speeds and loads. An idle adjustment screw is provided on one side of the carburetor to adjust the idle speed. The idle stop screw is used to prevent the throttle from rotating and to adjust the minimum opening of the throttle. There is a return spring above the throttle valve to close the throttle when the throttle handle is not rotating.

https://www.zhenhuagm.com/