Application of the product structure wheel side deceleration system on the Komatsu series of excavators. Application of the Huaiyin Institute of Technology Tan Guochen Chen Yong.
1刖曰Japan Komatsu, 02000220 excavator wheel side reduction system uses a cycloidal pinwheel reduction device, also known as a tooth difference planetary gear reduction device. Its structure is special compared with similar deceleration devices. The deceleration process is that the power input from the hydraulic motor is decelerated by the spur gear stage and then transmitted to the crankshaft. The crankshaft drives the cycloidal gear to make eccentric motion, and the cycloidal gear drives the pin type. The hub will have power output. The device consists of a deceleration system and a brake system.
2 deceleration system The deceleration system consists of two parts. The first part is the wheel speed reduction mechanism, which consists of spur gears. The first part is the eccentric deceleration mechanism, which consists of six eccentric wheels and two circumferential pendulums mounted on the root crankshaft. The linear gear 8 and the pin-type hub are called a stage reducer, and their function is to decelerate the high-speed motion after the stage deceleration, and convert it into a low-speed and high-torque to drive the excavator running device.
The slewing motion of the hydraulic motor of the 2.1-stage reducer is transmitted to the spur gear meshed with it through the input gear, and the eccentric crankshaft is driven to reduce the speed. For example, the transmission ratio is calculated by the following formula. The input shaft of the spur gear is 2.2-stage reducer wheel and 3 With the center of rotation of the crankshaft as the eccentric rotation and the rotation of the crankshaft, since the eccentric wheel on the root crankshaft passes through the cycloidal gear at the same time, the circumferential cycloid gear enters the trajectory as the circle with the center of the crankshaft as the center of the circle, with eccentricity The wheel eccentricity is the translation of the radius. In the same way, the cycloidal gear 8 is the same as the phase product structure. The two eccentric wheels on the coaxial direction are the same in the same direction, and the phase difference is 180. The purpose is to improve the balance performance and stress condition of the transmission. The circumferential cycloid gear liver man and the first 8 are the same as the eccentric crankshaft eccentric crankshaft spur gear, and the translation period is the eccentric crankshaft spur gear rotation period.
When the cycloidal gear and the 6 are eccentrically moved, the tooth faces of 1 input and 8 will roll along the pins that are constantly meshed, and the number of pins of the hub ring gear will be changed by the number of pins of the hub ring gear and the cycloidal line. The difference between the number of teeth of the gears is usually the difference between the revolutions. The cycloidal gear is translated for one week, and the pin is wound around the input shaft to rotate the circumference. The revolution of the pin is transmitted to the hub, and the hub is driven to reduce the rotation. The stage reduction drive is calculated according to the following formula: Zx pin number Zr circumference cycloid gear number total gear ratio 1 calculation type following stage reduction drive 3.
3 Brake system The brake system is mounted on the left side of the hydraulic motor. It consists of a single-position hydraulic control valve and a disc brake. Its working state is as follows: 3.1 brake release motor operation through the left control port to push the slide valve to the right, the slide valve to the left position, 1 when the oil circuit distributes the pressure oil to make the brake leave the hub, release the 2 force, and the pressure The oil enters the left inlet of the motor, causing the hydraulic motor to rotate. When the 8-port oil is introduced, the spool moves to the left and the motor reverses.
3.2 Brake work motor stop When the population stops supplying oil, the oil pressure on the left side oil pipe disappears, and the slide valve on the right side returns to the neutral position. At this time, the hydraulic motor does not drive the pressure oil. Due to the inertia of the vehicle, etc., the hydraulic motor Still turning.
The oil discharged from the liquid motor has no oil leakage passage, the outlet oil pressure rises sharply, the high pressure oil pushes the buffer valve on the right side, and flows into the left oil passage through the left one-way valve to prevent air pockets from being generated on the left oil passage. At the same time, since the oil pressure to the brake is cut off, the brake cylinder is restored to the speed limit motor of the hub 3.3 by the spring force, and the speed limit of the motor is reduced. The speed of the vehicle is increased due to the ramp, and the hydraulic motor is made. The overspeed movement, that is, the displacement of the hydraulic motor is greater than the hydraulic pump supply.
At this time, the braking condition is the same as that of 3.2, but it is not completely braked, but by reducing the speed of the hydraulic motor to make its displacement and pump Komatsu, 0200220 series hydraulic excavator decoration manual. Shandong Shandong Bulldozer Factory, 1998 Cao Yuchang. Construction machinery construction. Beijing Machinery Industry Press, Lei Tianjue. New hydraulic engineering manual. Beijing Institute of Technology Press, 1998, He Tingji et al. Road construction machinery manual. Beijing People's Communications Publishing Address, Department of Traffic Engineering, Huaiyin Institute of Technology, Huai'an, Jiangsu
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