The structure of the floating internal friction wheel reducer (Retarder), the outer friction wheel is coupled with the rotating pair O1, the inner friction wheel is coupled with the rotating pair O2, and the outer friction wheel is placed inside the inner friction wheel and two The center of the friction wheel leaves a certain distance. The floating friction wheel is placed in a wedge-shaped space formed by the outer friction wheel and the inner friction wheel. Under the action of gravity, the outer surface of the floating friction wheel is in contact with the outer surface of the outer friction wheel and the inner surface of the inner friction wheel, respectively.

     The structure of the floating internal friction wheel, the outer friction wheel and the frame are coupled by the rotating pair O1, the inner friction wheel is coupled with the rotating pair O2, and the outer friction wheel is placed inside the inner friction wheel and the center of the two friction wheels is separated a certain distance. Planetary gear reducer is a slewing mechanism widely used in East China and East China for tower-introduction crane machinery. It is widely used in metallurgy, mining, lifting, transportation, cement, construction, chemical, textile, printing and dyeing, pharmaceutical, etc. field. The floating friction wheel is placed in a wedge-shaped space formed by the outer friction wheel and the inner friction wheel. Under the action of gravity, the outer surface of the floating friction wheel is in contact with the outer surface of the outer friction wheel and the inner surface of the inner friction wheel, respectively.

     Working principle: The outer friction wheel is used as the input member, and the inner friction wheel is used as the output member. When the outer friction wheel rotates counterclockwise, the friction friction wheel is driven to rotate clockwise by the frictional force, and the floating friction wheel is driven by the friction force. The inner friction wheel rotates clockwise. Since the outer diameter (outer diameter) of the outer friction wheel and the inner diameter of the inner friction wheel are not equal, the floating inner friction wheel reducer (Retarder) changes the magnitude and direction of the rotation speed, and realizes the variable speed transmission.

    2 Determination of structural parameters

    2 1 Determination of the diameter range (fàn wéi)

     Set the diameter of the outer friction wheel to d

    1, the radius is r

    1. The center of the circle is O 1; the diameter of the inner friction wheel is d

    2. The radius is r

    2, the center of the circle is O 2; the diameter of the floating friction wheel is d

    3, the radius is r

     3. The center of the circle is O 3; the eccentric distance of the inner and outer friction wheels is e; the tangent points of the floating friction wheel and the outer and inner friction wheels are respectively A, B; the angles between the tangent lines of the two tangent points A, B The wedge angle; the angle between the center of the floating wheel and the center of the outer and inner friction wheel and the horizontal line are 1,2.

        Obviously, the center of the floating friction wheel O3 cannot be on the line of O1O2, because at these two positions (position) wedge angle = 0, the floating friction wheel is unstable (interpretation: stable stability; no change) state. The diameter of the floating friction wheel.

       2 2 The trajectory equation of the center of the circle and the relationship between the position of the center of the circle and the diameter set the coordinates of the center of the floating friction wheel O3

       It can be seen from the formula that when the diameters of the outer and inner friction wheels and the relative position of the center of the circle are known, the diameter of the floating friction wheel can be determined given any value of the center coordinates x and y of the floating friction wheel. Similarly, when the diameters of the outer and inner friction wheels and the relative position of the center of the circle are known, given the diameter of the floating friction wheel, it can be known whether the position of the floating friction wheel meets the requirements. Organize the style. The position of the center of the floating friction wheel is known by the formula.

     2 3 Determination of the wedge angle

The wedge angle affects the transmission capability of the reducer (Retarder), which is related to the position of the floating friction wheel. As shown, the center of the floating friction wheel.

    2 4 gear ratio

Transmission ratio.

    3 transmission capacity analysis (Analyse)

The outer friction wheel is set as the power input member, and the input torque is T 1; the force analysis of the floating friction wheel is analyzed, and the positive pressure and the friction force of the outer friction wheel acting on the floating friction wheel are respectively N

    13, F 13; the internal friction wheel acts on the floating friction wheel, the positive pressure and the friction force are respectively N

    23, F 23. Hardened gear reducer is a rotary mechanism widely used in East China and East China for tower-introduction crane machinery. It is widely used in metallurgy, mining, lifting, transportation, cement, construction, chemical, textile, printing and dyeing. In the field of pharmaceuticals. The direction of rotation of each friction wheel and the direction of each force are as shown. In order to facilitate the column force balance equation, the forces and direction angles of the floating friction wheel are plotted in a Cartesian coordinate system, as shown.

     Let the friction coefficient between the friction wheels be f; the diameters of the outer friction wheel, the inner friction wheel and the floating friction wheel. Gear reducer motor 1, R series coaxial helical gear reducer combined with international technical requirements, with high technology content 2, space saving, reliable and durable, with high overload capacity, power up to 132KW; 3, low energy consumption, Excellent performance, the speed reducer efficiency is up to 95%; 4, low vibration, low noise, high energy saving; 5, high-quality forged steel material, steel cast iron box, gear surface after high-frequency heat treatment; 6, after precision machining, ensure Shaft parallelism and positioning bearing requirements, the reducer that forms the helical gear transmission assembly is equipped with various types of motors, combined into mechatronics, which fully guarantees the quality characteristics of the product.

      When the friction reducer (Retarder) is running (interpretation: stable stability; no change), each friction wheel is in a state of constant rotation, at this time

     The drive failure form is slipping. The transmission capacity is determined by the Coulomb friction formula.

     The main factors affecting the transmission capacity are: wedge angle, position of the floating friction wheel (position) 1, 2, friction coefficient

F, the weight G3 of the floating friction wheel and the diameter d 1 of the outer friction wheel. Therefore, to improve the transmission capacity of the friction reducer (Retarder), the first consideration is the wedge angle, the position of the floating friction wheel 1, 2 and the influence of the friction coefficient f.

     4 Dynamic Analysis (Analyse)

The moment of inertia of the outer friction wheel, the inner friction wheel and the floating friction wheel is J is the equivalent moment of inertia.

When the characteristics of the input torque T 1 and the output torque T 2 are a function of 1 and its derivative, the second-order differential equation is solvable, and it will trace the friction wheel reducer (Retarder) at startup and smooth operation. The dynamic process of all stages of parking (guò chéng).

     In order to improve the transmission capacity and safety performance of the reducer (Retarder), it is not affected by the direction of gravity, and the transmission is realized in both forward and reverse directions. An improved internal friction wheel reducer can be used to add two floating friction wheels, and The two floating friction wheels that transmit the power are respectively coupled with the third floating friction wheel spring, so that the two floating friction wheels that transmit power can be symmetry, and the transmission can be realized in both directions. In addition, the preload of the two springs can be changed to change the transmission capacity or safety margin of the reducer.