Freewheels (bearings) are those that can be driven in one direction but overrun in the other. However, the different models in use will contain different load characteristics and require changes in the technical details of the construction of the freewheel.
1. Overrunning Freewheel Bearings
These freewheels are used in a variety of ways, mainly as a speed change for various mechanical devices.
2. Indexing Freewheel Bearings
In this form of application, the reciprocating motion provided to the driving raceway is converted into intermittent motion on the driven raceway and only in one direction.
3、Reverse Freewheel
In freewheeling operation, a raceway is often mounted on a fixed device relative to the ground. The function of the freewheel is to allow connection to other races in one direction only and to stop any rotating mechanical device in the opposite direction at any time. Although this type of freewheel performs overrunning movements most of the time, it provides the stopping of reversals like conveyor belts, gear reducers and similar parts, because its own function is to stop reversals.
Clutches are typically special machine components.
In one direction of rotation, there is no contact between the inner and outer ring, i.e. the freewheel is freewheeling.
In the other direction of rotation, the inner and outer ring are in close contact with each other and the freewheel can transmit high torques.
Thus, when the inner ring of the freewheel is stationary, the outer ring rotates in a clockwise direction (freewheeling operation). However, if the outer ring is turned in the opposite direction, the inner ring is driven to follow the outer ring (freewheeling operation) because of the close contact between the inner and outer ring.
Backstops
Overrunning Clutches
indexing freewheels
The freewheels perform these functions automatically in a wide range of machines. Unlike couplings and brakes, freewheels do not require a mechanical or hydraulic control system, for example in shift clutches and brakes.
1. Freewheels can be divided into two types: sprag block type and ball type. The sprag block type consists of multiple sprags and a fixed bracket. Since the shape of the sprag block is diamond-shaped, if the outer edge of the single freewheel is fixed during operation, the inner edge of the freewheel can only rotate clockwise at this time. When the sprag block is rotated counterclockwise, the inside and outside are connected as a whole, so the inner edge is also fixed. When the inner edge of the freewheel is fixed, the outer edge of the freewheel can only be rotated counterclockwise at this time, and is locked when rotated clockwise.
2. A freewheel is a locking of a working part so that it can only rotate in one direction. In layman’s terms, when the bicycle is walking forward, the wheel will go forward, but when it is backward, the wheel will not go backward, which is equivalent to the working principle of a one-way clutch.
3. The ball type has multiple balls and a return spring. In the work is such as the outer edge is fixed, the inner edge is connected by the ball and the outer edge when rotating clockwise, and the fixed is locked. In counterclockwise rotation drives the ball to overcome the spring’s elasticity to reverse, so that the gap between the ball and the inner edge increases, and the inner edge is free to rotate counterclockwise. On the contrary, when the inner edge is fixed, it is locked and cannot run.
1、Clutch backstops
2、Overrunning Clutch
3、Positioning clutch
4、Torque transfer type clutches
