What is the fit tolerance of the shaft hole of the coupling?

Couplings are currently used in many ways, and there are also many types of products on the market. So, what about the cooperation of coupling shaft holes? Let’s work together with the editor below. Come take a look!

Research status of rubber materials on elastic couplings

In recent years, new composite materials such as plastic alloys have been used very actively in the fields of petroleum, chemical industry, machinery, etc. For example, the COUPLICON/MIKI miniature flexible coupling in Japan uses plastic alloy parts instead of metal materials. It is a high-tech in recent years. One of the important development directions of the technical data market.Japan’s COUPLICON/1VIIKI miniature couplings and Germany’s VULKANDAN highly flexible couplings are all striding towards the direction of new materials.

Among the elastic couplings, the most commonly used elastomers are silicone rubber materials.Silicone rubber is divided into thermal vulcanization type (high temperature vulcanized silicone HTV) and room temperature vulcanization type (RTV). The room temperature vulcanization type is divided into polycondensation reaction type and addition reaction type. High temperature silicone rubber is mainly used to make various silicone rubber products, thermal vulcanization type Dosage.

高温硫化甲基硅橡胶于1944年由美国通用电气公司研制成功。1952年，美国陶一康宁公司L。 斯特布莱唐和K。波尔曼蒂尔研制出双组分室温硫化硅橡胶;1953-1955年制成甲基乙烯基硅橡胶;1956-1957年呈现硅氟橡胶;1958-1959年开发成功单组分室温硫化硅橡胶;之后呈现加成型硅橡胶系列产品。上有十多个出产硅橡胶。80年代以来，每年以15%左右的速度增加。 我国从60年代初期开端相继研制成功各类硅橡胶，现均有批量出产。

Silicone rubber has many common functions, such as resistance to unevenness, temperature, aging, etc., which cannot be compared and replaced by other organic polymer materials. It has become an important and indispensable new polymer material for the national economy.The base of the rubber material used in the star elastic coupling is silicone rubber, but the silicone rubber without reinforcing agent has poor mechanical functions (poor strength and wear resistance) at room temperature, so the silicone rubber we use has increased Reinforcing agent silicone rubber, however, no mechanical function study has been conducted on the materials of silicone rubber with reinforcing agent added.The tensile breaking strength of unreinforced silicone rubber vulcanized rubber is very low, as long as about 0.3MPa, which has no practical application value; and the addition of appropriate reinforcing agent and vulcanizing agent can make the tensile breaking strength of silicone rubber reach 8MPa, which is good for improving silicon The function of rubber is extremely important to extend the service life of products.

The reinforcement of rubber materials is generally completed by adding nano materials. The impact of nanotechnology on the function of rubber composite materials includes: strengthening of the materials, the use of nano materials filled rubber composite materials can increase its tensile strength, and in certain circumstances The value is presented within the range of the quantity; the plasticizing effect of the material is compared with the filled rubber compound material. With the reduction of the particle size, the material's elongation at break will increase; the influence of the Young's modulus of the material can make the composite material Young's modulus rises sharply; the influence of the composite of various nano materials on the mechanical function of the materials, the use of a variety of nano materials to fill the polymer can make the composite materials show the inductive function.The common reinforcing silicone rubber material is white carbon black. Nano white carbon black has extremely high activity. Compared with traditional carbon black, its particles are finer and the specific surface area is larger. The elastic pin coupling can make the filling of vulcanized rubber. High tensile strength, elasticity and tear strength, it is a kind of reinforcing agent.In the laboratory, the Department of Materials Science and Technology of the University of Maryland in the United States made nano-A120: composite materials with silicone rubber. Compared with conventional silicone rubber, its wear resistance, tensile strength, cracking elongation, etc. have been greatly improved.Many studies have indicated that there are three primary factors affecting the reinforcement of silicone rubber. They are the particle size, structure and surface activity of the reinforcing agent particles. Among these three factors, the particle size has the most significant effect.High-hardness silicone rubber is obtained through the filling of fumed silica and alumina, which improves the mechanical function and heat resistance function of the silicone rubber.

Cooperative public service of shaft hole of coupling

Fit tolerance refers to the sum of the holes and shafts that make up the cooperation.It is the amount of variation that allows for gap or interference.

Fit tolerance refers to the sum of the holes and shafts that make up the cooperation.It is the amount of variation that allows for gap or interference.The size of the service belt of the hole and the axis and the direction of the service belt constitute the cooperative service.The size of the coupling hole and shaft cooperation indicates the accuracy of the hole and shaft cooperation.The size and orientation of the cooperation belt between the hole and the shaft indicate the accuracy and nature of the cooperation between the hole and the shaft.

The size of the cooperative public service = the size of the public service belt; the size and orientation of the cooperative public service belt = the nature of cooperation.

①当轴承内径公役带与轴公役带构成合作时，在一般基孔制属过渡合作的公役代号将变为过盈合作，如k5、k6、m5、m6、n6等，但过盈量不大;当轴承内径公役代与h5、h6、g5、g6等构成合作时，不在是空隙而成为过盈合作。

②Because the service value of the bearing outer diameter is different from the general reference shaft, it is also a special service belt. In most cases, the outer ring device is fixed in the housing hole. The structure of some bearing components requires adjustment. Cooperation should not be too tight, and often cooperate with H6, H7, J6, J7, Js6, Js7, etc.

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