C6150型车床主轴箱内一对标准直齿圆柱齿轮(α=20°，=1，Cn=0.25)，z

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问题问答题计算题

C6150型车床主轴箱内一对标准直齿圆柱齿轮(α=20°，=1，Cⁿ=0.25)，z₁=21，z₂=66，模数m=3.5mm。试计算这对齿轮的分度圆直径d、齿顶圆直径d_a、齿顶高h_a、齿根高h_f、全齿高h。

答案

参考答案：

分度圆直径 d₁=mz₁=3.5mm×21=73.5mm

d₂=mz₂=3.5mm×66=231mm

齿顶圆直径 d_a1=m(z₁+2)=3.5mm×(21+2)=80.5mm

d_a2=m(z₂+2)=3.5mm×(66+2)=238mm

齿根圆直径 d_f1=m(z₁-2.5)=3.5mm×(21-2.5)

=64.75mm

d_f2=m(z₂-2.5)=3.5mm×(66-2.5)

=222.25mm

齿顶高 h_a=

m=3.5mm

齿根高 h_f=(

Cⁿ)m=1.25×3.5mm=4.375mm

全齿高 h=h_a+h_f=3.5mm+4.375mm=7.875mm

单项选择题

For nearly ten years, the Unified Modeling Language (UML) has been the industry standard for visualizing, specifying, constructing, and documenting the （） of a software-intensive system. As the （） standard modeling language, the UML facilitates communication and reduces confusion among project （）. The recent standardization of UML 2.0 has further extended the language’s scope and viability. Its inherent expressiveness allows users to （） everything from enterprise information systems and distributed Web-based applications to real-time embedded systems.

The UML is not limited to modeling software. In fact, it is expressive enough to model （） systems, such as workflow in the legal system, the structure and behavior of a patient healthcare system, software engineering in aircraft combat systems, and the design of hardware.

To understand the UML, you need to form a conceptual model of the language, and this requires learning three major elements: the UML’s basic building blocks, the rules that dictate how those building blocks may be put together, and some common mechanisms that apply throughout the UML.

The UML facilitates communication and reduces confusion among project （）.

A．investors

B．developers

C．designers

D．stakeholders

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