轨道是沿着键轴,有节面的分子轨道。
Pi orbitals are a molecular orbital that have a nodal plane through the bond axis.
这就是键轴，它就是两个原子核之间的轴。
So that is the bond axis it's just the axis between the two nuclei.
但记住sigma轨道沿着，键轴方向是没有节点的。
But keep in mind sigma orbitals have no nodal planes along the bond axis.
任何时候如果你有两个原子成键，键轴就是它们成键的方向。
So any time you have two atoms bonding, the bond axis is just the axis that they're bonding along.
机床。带4个键的花键轴和花键孔的剖面。内定心。尺寸。
Machine Tools; Spline Shafts and Spline Bore Profiles with 4 Splines, Internal Centering, Dimensions.
它是sigma键的原因是，因为如果你看键轴，上面是没有节面的。
The reason that it's sigma is if you look at the bonding axis here, is that there is no nodal plane along the bonding axis.
键在键轴之上，和之下都有电子密度，但它们在z方向有节面，这是键轴的地方。
So PI bonds have electron density both above and below the bond axis, but they actually have a nodal plane at this z, this bond axis here.
此外，它关于键轴是圆柱对称的，这就是为什么我们知道它是sigma轨道。
Also, it is cylindrically symmetric around the bonding axis, so this is how we know that it's a sigma orbital.
记住这是我们的键轴，你可以看到在这些区域，波函数在这个面内全都是零，这是节点面。
Remember this is our bond axis here, and you can see there is this area where the wave function is equal to zero all along that plane, that's a nodal plane.
第一个是在键轴之上和之下，我们可以看到电子密度，另外一个垂直于它，所以在键轴之前和之后有电子密度。
The first one will be above and below the bond axis is where we'll see the electron density, and the second will be perpendicular to that, so it will be a density in front of and behind the bond axis.
所以它是沿着键轴方向的,而且这里是一个碳sp2杂化轨道，和一个氢的1s轨道的结合,在这里我们可以合并他们。
So it's along the bond axis and it's between a carbon s p 2 hybrid, and then the hydrogen is just a 1 s orbital that we're combining here.
如果我们考虑,两个碳原子之间的z成键轴，我们可以画出sp杂化轨道的交叠，我们也可以画出和氢原子的成键。
So, if we think about this z bonding axis between the two carbon atoms, we can picture overlap of those s p hybrid orbitals, and then we can also picture bonding to hydrogen.
键是，So, we,talk,about, a, sigma,bond，关于键轴圆柱对称的，需要着重指出的是，而且沿着键轴是没有节面的。
Sigma as being cylindrically symmetric about the bond axis, and it's important to point out that it has no nodal plane across this bond axis.
告诉我们关于，And，the，sigma，tells，us，something，about，the,分子轨道对称性的信息，特别是它关于键轴是圆柱对称的。
Sigma symmetry of this molecular orbital, specifically that it's cylindrically symmetric about the bond axis.
当你把两个轨道合在一起，并在核间轴上有相互作用时，就形成了sigma键。
And a sigma bond forms any time you have two orbitals coming together and interacting on that internuclear axis.
任何时候两个轨道，在核间轴上直接到一起，你就能得到sigma键。
Any time two orbitals come straight on together in that internuclear axis, you're going to have a sigma bond.
如果我们考虑它的话，它是sigma键，对吧，它们沿着核轴方向靠近。
If we think about that, that's a sigma bond, right, they're coming together along the nuclear axis.
一个三键，同样的也有沿着核间轴sigma键。
A triple bond, again is going to have one sigma bond on the internuclear axis.
包含球轴承、滚柱轴承、轴、弹簧、齿轮、挂钩、心轴和键。用于设计机械工具和机械设备。
Contains ball bearings, roller bearings, shafts, springs, gears, hooks, spindles, and keys. Use to design machine tools and mechanical devices.
在壳体上安装齿轮箱，确保齿轮箱轴键妥当地固定在耦合键槽中。
Mount gearbox on housing, assuring that coup ling key slot accepts gearbox shaft key properly.
一般在轮毂内装有两个螺钉，一个螺钉压在键上，另一个则压在轴上。
Generally, two screws are placed in the hub: one screw bears on the key and the other bears on the shaft.
文中建立了轮轨蠕滑力、自由轮对和两轴车的键图模型，并给出了部分数值计算的结果。
The bond graph models of wheel-rail creep forces, of free wheel set, and of two-axle vehicle are developed with associated numerical calculations.
轴和轮毂通常用键固定在一起。
Shafts and hubs are usually fastened together by means of keys.
螺旋桨通过使用船厂提供的液压顶升装置压入螺旋桨轴并采用湿式无键固定法紧固。
The propeller is to be force fitted to the propeller shaft by using the hydraulic jack which the Builder possess and secured by wet type keyless fitting method.
按“检测”键，可自动完成一个单轴的检测过程。
Press the "test" key and the test process of a single axle can automatically be finished.
对变速箱中间轴键的强度进行了校核，提出了对中间轴脱键及键损坏等质量问题的改进措施。
This paper makes the strength check of gearbox's middle axle key, and advances the improving countermeasures for its quality problems such as running-off-key and key damaging of the middle axle.
输入轴键受到固定螺钉的保护，输入和输出轴键配置实现最佳的刚性连接以提供更好的扭矩传送。
With the input shaft key secured with a set screw, an input and output shaft key configuration delivers optimum positive connection for superior torque transmission.
例如，在一个实施例中，无级变速器包括具有键(628)和换档凸缘(609)的轴(624)。
For example, in one embodiment, a CVT includes a shaft (624) having a spline (628) and a shift flange (609).
独特的锁闭杆系统，防止输出轴上的键在键槽倾斜，消除了键和键槽损害的可能性及其可能会导致的生产力损失。
The unique locking bar system prevents the key on the output shaft from tipping in the keyway, eliminating the possibility for key and keyway damage that results in a loss of productivity.
一个不锈钢从动轴包括一个被控制键和不锈钢紧固件，以及一个双作用活塞防止离合器和刹车功能重叠。
A stainless steel output shaft includes a captive key and stainless steel fasteners, and a single double-acting piston prevents overlap of the clutch and brake functions.
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