行业组件数据 · 2026

键槽

繁體:鍵槽

键槽是精确加工在轮毂孔或轴表面上的纵向沟槽或槽口,用于容纳平行键或半月键。

技术定义与适配语境
典型 键槽 会按材料、尺寸公差、适配关系和失效风险在 橡胶和塑料制品制造 中评估。

键槽是精确加工在轮毂孔或轴表面上的纵向沟槽或槽口,用于容纳平行键或半月键。在聚丙烯注塑齿轮中,键槽通常在制造过程中直接模塑在齿轮轮毂上,以与轴形成正向机械连接,防止相对旋转,确保精确的动力传递。键槽的尺寸必须保持严格的公差,以匹配标准键的尺寸,同时考虑塑料部件的收缩和热膨胀等材料特性。 键槽通过提供一个凹槽来容纳键,该键同时嵌入轴和齿轮轮毂中。当施加扭矩时,键通过其侧面的剪切应力将旋转力从轴传递到齿轮(或反之),防止滑动。在聚丙烯齿轮中,模塑的键槽必须均匀分布应力,以避免局部变形或开裂,这依赖于塑料的弹性和键的机械过盈配合。

组件规格

定义
键槽是精确加工在轮毂孔或轴表面上的纵向沟槽或槽口,用于容纳平行键或半月键。在聚丙烯注塑齿轮中,键槽通常在制造过程中直接模塑在齿轮轮毂上,以与轴形成正向机械连接,防止相对旋转,确保精确的动力传递。键槽的尺寸必须保持严格的公差,以匹配标准键的尺寸,同时考虑塑料部件的收缩和热膨胀等材料特性。

键槽通过提供一个凹槽来容纳键,该键同时嵌入轴和齿轮轮毂中。当施加扭矩时,键通过其侧面的剪切应力将旋转力从轴传递到齿轮(或反之),防止滑动。在聚丙烯齿轮中,模塑的键槽必须均匀分布应力,以避免局部变形或开裂,这依赖于塑料的弹性和键的机械过盈配合。
工作原理
The keyway works by providing a recess for a key that fits into both the shaft and the hub of the gear wheel. When torque is applied, the key transmits rotational force from the shaft to the gear (or vice versa) through shear stress across the key's sides, preventing slippage. In polypropylene gears, the molded keyway must distribute stress evenly to avoid localized deformation or cracking, relying on the plastic's resilience and the key's mechanical interference fit.
材料
聚丙烯(PP)通常为均聚物或共聚物牌号并添加增强强度、耐磨性和尺寸稳定性的添加剂。常见规格包括含20-40%玻璃纤维增强的PP以提高机械性能或矿物填充PP用于经济型应用。材料必须符合ISO 1873-1或ASTM D4101等标准。
Draft Angle
0.5-1° for mold release in injection molding
Hub Diameter
Matches standard shaft sizes (e.g., 10 mm, 12 mm, 15 mm)
Keyway Depth
Typically 0.5-2.0 mm, depending on shaft diameter and torque requirements
Keyway Width
Standard sizes per ISO 773: e.g., 3 mm, 4 mm, 5 mm
Surface Finish
Ra ≤ 3.2 μm to reduce stress concentrations
Tolerance Class
ISO 773 tolerance class H9 for plastic components
标准
ISO 773DIN 6885ISO 286-2

行业分类与别名

键槽 的常用贸易名称、技术标识和检索关键词。

上级产品

该组件会出现在以下整机或工业产品中。

FMEA · 风险与缓解

诱因 → 失效模式 → 工程缓解

Sharp corners or inadequate fillet radius in keyway design->Crack initiation and propagation in polypropylene hub->Design keyways with minimum 0.5 mm radius fillets, use stress analysis software, and select reinforced PP grades
Excessive torque exceeding material yield strength->Shear failure of keyway walls or key deformation->Calculate torque limits based on material properties, oversize keyway dimensions, or use metal inserts in high-load applications
Molding defects like voids or sink marks in keyway area->Reduced mechanical strength and premature failure->Optimize injection molding parameters (pressure, temperature), ensure proper gate location, and implement quality control inspections

工业生态与工程逻辑

0
Stress concentration at keyway corners leading to cracking
1
Wear and deformation under high torque loads
2
Misalignment due to molding defects or shrinkage
3
Thermal expansion mismatch with metal shafts causing looseness

合规与检测

tolerance
Keyway width tolerance: H9 per ISO 286-2, depth tolerance: ±0.1 mm for typical applications
test method
Dimensional verification using CMM or optical comparators, torque testing per ISO 5299, and visual inspection for defects per ASTM D2561

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采购评估维度

不是客户评论,也不是实时热度。以下维度用于前期 RFQ 准备和供应商评估。

技术文档
4/5
制造能力
4/5
可检验性
5/5
供应商透明度
3/5

这些分值是采购评估维度示例,不代表真实客户评分、具体国家买家反馈或实时询盘。

相关组件

常见问题

Why use a keyway in plastic gears instead of other locking methods?

Keyways provide a cost-effective, standardized, and reliable method for torque transmission in plastic gears, offering easy assembly and disassembly while maintaining alignment. Alternatives like set screws or press fits may cause stress concentrations or damage in polypropylene.

How does polypropylene affect keyway design compared to metal?

Polypropylene has lower strength and higher thermal expansion than metals, requiring keyways to be designed with wider tolerances, rounded corners to reduce stress, and possible reinforcement (e.g., glass fiber) to prevent deformation under load.

What are common failure modes for keyways in plastic gears?

Common failures include cracking due to stress concentration at sharp corners, wear from key movement under cyclic loading, and deformation from excessive torque or thermal expansion mismatches with the shaft.

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CNFX Industrial Component Index · 橡胶和塑料制品制造

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URN:CNFX:ME:UNIT:KEYWAY