I. What is a speed reducer?
A speed reducer is a gear-driven reducer housed in a rigid housing. It is driven by a worm gear. Independent components consisting of gear and worm gear drives are widely used in modern machinery. This is a relatively precise machine, also known as a speed reducer.
II. What is the function of a speed reducer?
Speed reducers are generally used in low-speed, high-torque transmission equipment, matched with prime movers, working machinery, or actuators, and have two main functions:
1. Increase output torque simultaneously during deceleration. The torque output ratio should be based on the motor output multiplier/deceleration ratio, but be careful not to exceed the rated torque of the reducer.
2. During deceleration, reduce the load inertia until the inertia is reduced to the square of the deceleration ratio.
3. What types of speed reducers are there?
There are many types of speed reducers, with different models, and they can be classified into different categories according to various methods:
1. Classification by transmission type
(1) Gear reducer: It consists of gear pairs of various levels, with the small gear driving the large gear to achieve a certain speed reduction.
(2) Worm gear reducer: also known as worm gear reducer, is a power transmission mechanism that uses a gear converter to reduce the speed of the motor to the required speed and obtain greater torque.
(3) Planetary reducer: Planetary reducers are used for speed reduction. They are widely used in servo systems. They have advantages such as small size, high transmission efficiency, wide shrinkage range, and high precision. Stepper motors are used in DC power transmission systems.
2. Scoring based on different transmission levels
(1) Single-stage reducer: There is only one driving gear or worm gear (sleeved on the drive shaft and driven by the motor) and one driven gear (output motion) meshing.
(2) Multi-stage reducer: The internal driven gear meshes with another gear (which outputs motion), i.e., a two-stage reducer with multiple transmission stages.
3. Classified by gear shape
They can be divided into cylindrical gear reducers and bevel gear reducers.
4. Classification based on transmission layout
(1) Expanded type: high-speed long-tail helical gear, low-speed spur gear or helical gear. Due to the asymmetrical arrangement of the gears relative to the bearings, shaft stiffness and torque input are required. The output end is far from the gear to reduce the uneven distribution of load along the tooth width caused by shaft bending deformation. The reducer has a simple structure and is the most widely used.
(2) Flow guidance: High-speed flow guidance is generally adopted. Because the gear and bearing layout is symmetrical, the load-bearing capacity between the gears and bearings is uniform. To reduce the total axial force on the shaft, the helical directions of the two gears should be opposite. The reducer has a complex structure and is often used in high-power, variable-load applications.
(3) Coaxial: Coaxial reducers have large axial dimensions, long central shafts, and poor rigidity. When the oil immersion depths of the two large gears are similar, the load-bearing capacity of the high-speed gears cannot be fully utilized. They are usually used in coaxial input and output applications.
