Summary of the advantages and disadvantages of the coarse and fine tooth structure of the hydraulic wrench

The coarse and fine teeth of the hydraulic wrench are divided into the ratchet pawl. The single tooth meshing of the ratchet pawl is called the coarse tooth, and the multi-tooth meshing is called the fine tooth. The two structures have their own advantages and disadvantages. Only by understanding its advantages and disadvantages and choosing the correct structure type in combination with the actual situation can the work efficiency and the service life of the wrench be improved. Today, I have compiled some advantages and disadvantages of the thick and fine tooth structure of hydraulic wrenches for your reference.

Coarse tooth structure:

Advantages:

1. The coarse-tooth hydraulic wrench adopts large ratchet teeth, and the load capacity of a single tooth is large. It is not easy to break when the material and heat treatment meet the design standards. The service life of the ratchet wheel and pawl is long.

2. The wrench generally has a reaction force system to prevent the nut from reversing during the return stroke; each stroke has a crisp clinking sound, which is convenient for the operator to operate by sound; the single-tooth meshing structure is already in the design With full load strength design, the phenomenon of tooth chipping will be less.

Disadvantages: The wrench will occasionally be stuck when it is working. Once stuck, it is difficult to remove the nut, and the accuracy is also poor.

Fine-tooth structure: (Guide: A mistake made by Boeing 787 on fasteners)

Advantages:

1. High strength: fine-tooth hydraulic wrench ratchet and pawl joint surface is large, high precision;

2. High accuracy: The torque accuracy is determined by the last stroke of the set pressure. The last stroke of the fine-tooth structure can pass three teeth according to the torsion angle, or it can only pass two teeth, one tooth, to be the closest to the set The output torque is set, and the last stroke of the coarse tooth either passes one tooth or cannot pass. If it does not pass, the actual torque does not reach the set torque;

3. Fast speed.

Disadvantages:

1. Small bearing capacity: The fine-tooth hydraulic wrench adopts a small ratchet design, and the bearing capacity of a single tooth is smaller than that of a coarse-tooth wrench;

2. High processing accuracy: The fine-tooth structure requires high processing accuracy of the ratchet or pawl, otherwise it will increase the wear of the ratchet and pawl mechanism and reduce the service life;

3. High probability of tooth fracture: Although the ratchet and pawl use multi-tooth meshing to increase the load-bearing capacity, the probability of tooth fracture is still greater than that of the coarse tooth structure design.

Through the above explanation and comparison, we can see that hydraulic wrenches with coarse-tooth structure or hydraulic wrenches with fine-tooth structure have their respective advantages and disadvantages. Regardless of the structural design, as long as the design parameters of the product, the selection of raw materials, and the heat treatment process meet the quality standards, the product can be used normally. Advantages and disadvantages of hydraulic wrench coarse and fine tooth structure.

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