科技英语7.3
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安装
1.直齿圆柱齿轮：直齿圆柱齿轮用于在平行的 轴间传递功和转动。如图7-1所示，齿的切割 与齿轮安装的轴线相平行。
小齿轮
The smaller of two gears in mesh is called the pinion, and the large is customarily designated as the gear. In most applications the pinion is the driving whereas the gear is the driven element.
圆锥
4.伞齿轮：用来在不平行而相交的轴间传递功率的最 重要的齿轮类型是伞齿轮，也许伞齿轮最好被描述为 圆锥齿轮，因为它们是在圆锥面上切割的。
直齿锥（伞）齿轮
There are three primary types of bevel gears: straight bevel gears (Fig. 7-5), spiral bevel gears (Fig. 7-6) and hypoid bevel gears (Fig. 7-7).
螺旋，螺旋线 关于，相对于
与轮齿被切削为平行于齿轮轴线的直齿圆柱齿轮 不同，斜齿轮的轮齿被切削为螺旋线的形式，即 相对于齿轮轴线夹一恒定角度。
3.Worm Gears Although crossed helical gears can be used for applications involving nonparallel, nonintersecting shafts, they are rather limited in their load transmission capacity. In addition, large speed ratios, on the order of say 200 to 1 could not be reasonably achieved in one reduction because of the size of gear required.
准双曲面锥（伞）齿轮 曲齿锥（伞）齿轮
锥齿轮有三种基本的形式：直齿锥齿轮（图7-5）、 曲齿锥齿轮（图7-6）和准双曲面锥齿轮（图7-7）。
总 结
齿轮：gear 小齿轮：pinion 主动元件：driving element 被动元件：driven element 支齿圆柱齿轮：spur gears 斜齿轮：helical gears 交错轴斜齿轮：crossed helical gears 啮合：engage/mesh with 蜗轮：worm gears 蜗杆：worm 斜（伞）齿轮：bevel gears
相隔，分开（异面）
蜗轮装置如图7-4所示，由蜗杆—它与螺丝非常相 似—和蜗轮—它是一个斜齿轮—组成。蜗杆和蜗轮 的安装通常呈异面90度。
震动，冲击
与…有关的
One of the advantages associated with the use of worm gears is that the tooth engagement occurs without the shock prevalent in other gear types. In fact the meshing of two teeth occurs with a sliding action which, while resulting in very quiet operation, may produce overheating.
减少，消除，抑制 需要
图7-3描绘了一对啮合的交错轴斜齿轮。直齿圆柱齿 轮被用于低速和那些对噪音控制要求不高的场合，而 在高速、大功率传动或对噪声有严格要求的应用场合， 则需要使用斜齿轮。
Whereas spur gears have their teeth cut parallel to the gear axis, helical gear teeth are cut in the form of helices making a constant angle with respect to the gear axis.
可能的，可行的
比如说，如果小齿轮有20个齿，那么大齿轮就得有 4000个齿。对该问题的一个可行的解决方式是使用 蜗轮装置。
螺丝
A worm gear set such as shown in Fig. 7-4 consists of the worm, which is very similar to a screw, and the worm gear, which is a helical gear. The shafts upon which the worm and the gear are mounted are usually 90 degrees apart.
线性代数 --------------Linear Algebra 法律基础 --------------Fundamentals of Law 复变函数与积分变换 ----Functions of Complex Variables & Intergral Transformations 电路理论 --------------Theory of Ciruitry 概率论与随机过程 ------Probability Theory & Stochastic Process 金工实习 --------------Metalworking Practice
至关重要的
只不过是……
Gears are vital factors in machinery. One of the first mechanism invented using gears was the clock. In fact, a clock is little more than a train of gears. Considerable study and research have been made on gears in recent years because of their wide use under exacting conditions.
Gears
齿 轮
英语谚语一则
课前小知识
Nothing in the world is difficult for one who sets his minds to it 世上无难事，只怕有心人。
英语知识小点滴
解放思想、的实事求是的思想路线 ideological line of emancipating the mind and seeking truth from facts
机械师，机械工 齿轮传动装置
和过去相比，现在的齿轮要传递更重的载荷，并以 更高的速度运转。工程师和机械师一致认为，几乎 在所有的机械领域内齿轮装置都是最基本的元件。
直齿圆柱齿轮
1.Spur Gears Spur gears are used to transmit power and rotary motion between parallel shafts. As can be seen in Fig. 7-1, the teeth are cut parallel to the axis of the shaft on which the gears are mounted.
补充内容：常见课程名称的英文翻译
大学英语 --------------College English 高等数学 --------------Advanced Mathmatics 体育 ------------------Physical Education 机械制图 --------------Mechanical Graphing 大学物理 --------------College Physics 物理实验 --------------Experiment of College Physics
平稳运行
蜗轮的应用带来的优势之一是轮齿啮合时不会产生 其它齿轮类型中普遍存在的冲击，但实际上一对齿 轮啮合时伴有的滑动虽导致了运行的平稳，但也会 造成过热。
伞齿轮，锥齿轮
4.Bevel Gears The most important type of gear used to transmit power between nonparallel, intersecting shafts is the bevel gear. Bevel gears can perhaps be best described as being conical gears, because they are cut on conical blanks.
减速 大约，相当于
蜗轮
3.蜗轮：虽然交错轴斜齿轮可以应用于涉及到既不 平行也不相交的轴的设备，但它们传递载荷的能力 却比较有限。此外，鉴于对齿轮尺寸的要求，像 200:1这样的大速比在一级减速中也不可能合理的得 到。
For example, if the smaller gear had 20 teeth, the large would have to have 4 000 teeth. A much more feasible solution to the problem would be the use of a worm gear set.
严格的பைடு நூலகம்苛刻的
在机器中齿轮是一个不可缺少的元件。首先采用了齿 轮的发明之一是钟表，实际上，钟表就是一系列的齿 轮。因为齿轮在苛刻的条件下的广泛适用性，近些年 来对其作了大量的学习和研究工作。
They have to transmit heavier loads and run at higher speeds than ever before. The engineers and the machinists all consider gearing the prime element in nearly all classes of machinery.
交错轴斜齿轮
非平行的 不相交的
斜齿轮
2.斜齿轮：图7-2所示是一对相互啮合的斜齿轮。所示 的一对齿轮装在相互平行的轴上，这也是大多数场合 中斜齿轮的使用方式。然而，有时候斜齿轮使用时其 轴线是既不平行也不相交的，当以这种方式应用时， 它们被称为交错轴斜齿轮。
Fig. 7-3 illustrates a pair of crossed helical gears in mesh. Spur gears are used for low speed applications and those situations where noise control is not a problem. Use of helical gears is indicated when applications involves high speeds, large power transmission, or where noise abatement is important.
被动元件 被称为 主动元件
啮合的一对齿轮中较小的一个称为小齿轮，而大的 则通常被称为“齿轮”。在大多数设备中，小齿轮 通常是主动元件，而齿轮则通常是从动元件。
2.Helical Gears Fig. 7-2 shows helical gears in mesh. The pair shown is mounted on parallel shafts, the most common situation for which helical gears are used. However, helical gears are sometimes used for nonparallel, nonintersecting shaft applications. When used in this manner, they are known as crossed helical gears.
1.直齿圆柱齿轮：直齿圆柱齿轮用于在平行的 轴间传递功和转动。如图7-1所示，齿的切割 与齿轮安装的轴线相平行。
小齿轮
The smaller of two gears in mesh is called the pinion, and the large is customarily designated as the gear. In most applications the pinion is the driving whereas the gear is the driven element.
圆锥
4.伞齿轮：用来在不平行而相交的轴间传递功率的最 重要的齿轮类型是伞齿轮，也许伞齿轮最好被描述为 圆锥齿轮，因为它们是在圆锥面上切割的。
直齿锥（伞）齿轮
There are three primary types of bevel gears: straight bevel gears (Fig. 7-5), spiral bevel gears (Fig. 7-6) and hypoid bevel gears (Fig. 7-7).
螺旋，螺旋线 关于，相对于
与轮齿被切削为平行于齿轮轴线的直齿圆柱齿轮 不同，斜齿轮的轮齿被切削为螺旋线的形式，即 相对于齿轮轴线夹一恒定角度。
3.Worm Gears Although crossed helical gears can be used for applications involving nonparallel, nonintersecting shafts, they are rather limited in their load transmission capacity. In addition, large speed ratios, on the order of say 200 to 1 could not be reasonably achieved in one reduction because of the size of gear required.
准双曲面锥（伞）齿轮 曲齿锥（伞）齿轮
锥齿轮有三种基本的形式：直齿锥齿轮（图7-5）、 曲齿锥齿轮（图7-6）和准双曲面锥齿轮（图7-7）。
总 结
齿轮：gear 小齿轮：pinion 主动元件：driving element 被动元件：driven element 支齿圆柱齿轮：spur gears 斜齿轮：helical gears 交错轴斜齿轮：crossed helical gears 啮合：engage/mesh with 蜗轮：worm gears 蜗杆：worm 斜（伞）齿轮：bevel gears
相隔，分开（异面）
蜗轮装置如图7-4所示，由蜗杆—它与螺丝非常相 似—和蜗轮—它是一个斜齿轮—组成。蜗杆和蜗轮 的安装通常呈异面90度。
震动，冲击
与…有关的
One of the advantages associated with the use of worm gears is that the tooth engagement occurs without the shock prevalent in other gear types. In fact the meshing of two teeth occurs with a sliding action which, while resulting in very quiet operation, may produce overheating.
减少，消除，抑制 需要
图7-3描绘了一对啮合的交错轴斜齿轮。直齿圆柱齿 轮被用于低速和那些对噪音控制要求不高的场合，而 在高速、大功率传动或对噪声有严格要求的应用场合， 则需要使用斜齿轮。
Whereas spur gears have their teeth cut parallel to the gear axis, helical gear teeth are cut in the form of helices making a constant angle with respect to the gear axis.
可能的，可行的
比如说，如果小齿轮有20个齿，那么大齿轮就得有 4000个齿。对该问题的一个可行的解决方式是使用 蜗轮装置。
螺丝
A worm gear set such as shown in Fig. 7-4 consists of the worm, which is very similar to a screw, and the worm gear, which is a helical gear. The shafts upon which the worm and the gear are mounted are usually 90 degrees apart.
线性代数 --------------Linear Algebra 法律基础 --------------Fundamentals of Law 复变函数与积分变换 ----Functions of Complex Variables & Intergral Transformations 电路理论 --------------Theory of Ciruitry 概率论与随机过程 ------Probability Theory & Stochastic Process 金工实习 --------------Metalworking Practice
至关重要的
只不过是……
Gears are vital factors in machinery. One of the first mechanism invented using gears was the clock. In fact, a clock is little more than a train of gears. Considerable study and research have been made on gears in recent years because of their wide use under exacting conditions.
Gears
齿 轮
英语谚语一则
课前小知识
Nothing in the world is difficult for one who sets his minds to it 世上无难事，只怕有心人。
英语知识小点滴
解放思想、的实事求是的思想路线 ideological line of emancipating the mind and seeking truth from facts
机械师，机械工 齿轮传动装置
和过去相比，现在的齿轮要传递更重的载荷，并以 更高的速度运转。工程师和机械师一致认为，几乎 在所有的机械领域内齿轮装置都是最基本的元件。
直齿圆柱齿轮
1.Spur Gears Spur gears are used to transmit power and rotary motion between parallel shafts. As can be seen in Fig. 7-1, the teeth are cut parallel to the axis of the shaft on which the gears are mounted.
补充内容：常见课程名称的英文翻译
大学英语 --------------College English 高等数学 --------------Advanced Mathmatics 体育 ------------------Physical Education 机械制图 --------------Mechanical Graphing 大学物理 --------------College Physics 物理实验 --------------Experiment of College Physics
平稳运行
蜗轮的应用带来的优势之一是轮齿啮合时不会产生 其它齿轮类型中普遍存在的冲击，但实际上一对齿 轮啮合时伴有的滑动虽导致了运行的平稳，但也会 造成过热。
伞齿轮，锥齿轮
4.Bevel Gears The most important type of gear used to transmit power between nonparallel, intersecting shafts is the bevel gear. Bevel gears can perhaps be best described as being conical gears, because they are cut on conical blanks.
减速 大约，相当于
蜗轮
3.蜗轮：虽然交错轴斜齿轮可以应用于涉及到既不 平行也不相交的轴的设备，但它们传递载荷的能力 却比较有限。此外，鉴于对齿轮尺寸的要求，像 200:1这样的大速比在一级减速中也不可能合理的得 到。
For example, if the smaller gear had 20 teeth, the large would have to have 4 000 teeth. A much more feasible solution to the problem would be the use of a worm gear set.
严格的பைடு நூலகம்苛刻的
在机器中齿轮是一个不可缺少的元件。首先采用了齿 轮的发明之一是钟表，实际上，钟表就是一系列的齿 轮。因为齿轮在苛刻的条件下的广泛适用性，近些年 来对其作了大量的学习和研究工作。
They have to transmit heavier loads and run at higher speeds than ever before. The engineers and the machinists all consider gearing the prime element in nearly all classes of machinery.
交错轴斜齿轮
非平行的 不相交的
斜齿轮
2.斜齿轮：图7-2所示是一对相互啮合的斜齿轮。所示 的一对齿轮装在相互平行的轴上，这也是大多数场合 中斜齿轮的使用方式。然而，有时候斜齿轮使用时其 轴线是既不平行也不相交的，当以这种方式应用时， 它们被称为交错轴斜齿轮。
Fig. 7-3 illustrates a pair of crossed helical gears in mesh. Spur gears are used for low speed applications and those situations where noise control is not a problem. Use of helical gears is indicated when applications involves high speeds, large power transmission, or where noise abatement is important.
被动元件 被称为 主动元件
啮合的一对齿轮中较小的一个称为小齿轮，而大的 则通常被称为“齿轮”。在大多数设备中，小齿轮 通常是主动元件，而齿轮则通常是从动元件。
2.Helical Gears Fig. 7-2 shows helical gears in mesh. The pair shown is mounted on parallel shafts, the most common situation for which helical gears are used. However, helical gears are sometimes used for nonparallel, nonintersecting shaft applications. When used in this manner, they are known as crossed helical gears.