Plastic Spur Gears with Steel Core Description
Plastic gears(Plastic Spur Gears with Steel Core) are commonly working in inside various machines such as food processing machines, home appliances, chemical-related machines, toys, and medical equipment.
Commonly used materials for plastic gears are engineering plastic polyoxymethylene (POM), polyamide MC nylon, U-PE, PEEK, etc.
In addition, when using plastic gears, if the ambient temperature changes significantly, the gear hole diameter is large, and the keyway load is large, Using the S45C or stainless steel hubs. When using S45C or stainless steel hubs, the teeth and the hub are typically fixing with bolts. However, when the bolts is not working well, spur gears use a fusion method to improve the teeth and the corner. Our spur gears (steel core plastic spur gears) are designed to have more vital fused parts than the teeth of the gears.
Plastic gears have many advantages, such as being lightweight, no rust, and high quietness. On the other hand, plastic gears have shortcomings, such as low strength, ease of heat, and significant dimensional changes such as tooth clearance compared with metal gears. However, the degree of dimensional change easily caused by plastic gears varies depending on the material’s resistance to temperature changes, water absorption, and chemical resistance.
| Plastic Spur Gears with Steel Cores Specification | |
|---|---|
| Precision Grade | JIS grade N9 (JIS B1702-1: 1998) JIS grade 5 (JIS B1702: 1976) |
| Gear Teeth | Standard full depth |
| Pressure Angle | 20° |
| Material | MC602ST with S45C core |
| Heat Treatment | — |
| Tooth Hardness | (115 ~ 120HRR) |
Primary information
| Product No. NSU1-50 | |||
|---|---|---|---|
| Module | 1 | Number Of Teeth | 50 |
| Shape | S1 | Bore (A) | 10mm |
| Hub Diameter (B) | 30mm | Pitch Diameter (C) | 50mm |
| Outside Diameter (D) | 52mm | Face Width (E) | 10mm |
| Hub Width (F) | 10mm | Total Length (G) | 20mm |
| Metal Core Diameter | 34 | Series Code | 12 |
| Backlash Low | 0mm | Backlash Up | 0.34mm |
Metal Inserts
Injection-molded metal inserts are working in plastic gears for a variety of reasons:
- To avoid an extra finishing operation.
- To achieve more excellent dimensional stability because the metal will shrink less and is not sensitive to moisture; it is also a better heat sink.
- To provide greater load-carrying capacity.
- To provide increased rigidity.
- To permit repeated assembly and disassembly.
- To provide a more precise bore to shaft fit.
- As durable support for fasteners, such as set screws to affix the gear to the shaft.
Inserts is molding into the part or subsequently assembled. In the case of subsequent assembly, stress concentrations may be present and lead to cracking of the components. The interference limits for press fits obey to depend on the material used; also, proper minimum wall thicknesses around the inserts must be observed. The insertion of inserts may be accomplished by ultrasonically driving in the insert. In this case, the material melts into the knurling at the insert periphery.
Screw machine is usually producing innserts and the innserts are making of aluminum or brass. This will reduce the residual stresses in the plastic part of the gear during a contraction while cooling after molding.
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