直线机构设计（SAM 6.1）

muoubear*

以下截图均来自Artas公司设计软件SAM 6.1，通过其设计向导可以进行直线机构设计，直线机构分精确线性和近似线性两部分。本篇将利用该软件，通过该软件对话框的说明和其仿真动图，分析不同直线机构的设计要点。

Exact Linear 精确线性Type 1

Symmetric Slider-Crank Mechanism : This mechanism is entirely defined by specifying the length a.

对称曲柄滑块机构：该机构完全根据指定的长度a定义。

Type 2

Geared Double Crank Mechanism : You can specify the values a, b and R.

齿轮双曲柄机构：可以指定a，b和R的值。

Type 3

Hypo-Cyclic Planetary Gear Mechanism : The user can only specify the radius R. The ratio 1:2 between the two gears is fixed (in order to obtain a straight line).

准圆行星齿轮机构：用户只能指定半径R。两齿轮间的比率1:2为固定值（为了获得直线）。

Type 4

Planetary Gear-Coupled Dyad : The user can specify the length a. The ratio 2:1 of the inner and outer gear is fixed (this is essential in order to obtain a straight line), whereas the radius of the middle gear is (arbitrarily) chosen at 0.2*a. The mechanism is modelled with 2 pairs of gears, with 2 overlapping gears at the middle position.

行星齿轮耦合副：用户可以指定a的长度，内外齿轮的比率2:1为固定值（这个对于获得直线很重要），中间齿轮的半径为（任意），通常选择为0.2*a。机构由两对齿轮构成，中间位置有两个重叠齿轮。

Type 5

Belt-Coupled Dyad : The user can specify the length a. The ratio 2:1 of the two wheels is fixed (this is essential in order to obtain a straight line). The radius R is (arbitrarily) chosen at 0.2*a.

皮带耦合副：使用者可以指定a的长度。两个轮的比率2:1为固定值（这个对于获取直线很重要）。半径R（任意）,通常选择为0.2*R。

Approximate Linear 近似线性Watt

This is the most typical configuration of a WATT mechanism (identical lengths of the horizontal linkages and coupler point located midway along the vertical linkage). However, the length of the horizontal linkages does not necessarily have to be identical as long as the coupler point is located accordingly on the vertical linkage (see manual).

这是最经典的瓦特机构配置（水平连杆等长，耦合点位于垂直连杆的中点）。但是，只要耦合点位于相应的垂直连杆上，水平连杆的长度不一定必须相同（见手册说明）。

Note：手册上没有提及，通过实例操作，两水平杆不等长情况下，耦合点需要沿着垂直杆向长水平杆侧等比例偏移。

Chebyshev

No comment

没有说明。

Roberts

By increasing the ratio of the height of the mechanism to its width, the accuracy of the motion may be increased

通过增加机构的高宽比，可以提高运动的精度。

Evans

This approximated straight line mechanism is derived from the exact straight line slider-crank mechanism (type-1 in wizard "Exact Linear Guiding"). The length b may be chosen freely, however a larger value reduces the deviation of the coupler point from a straight line.

这种近似直线机构来源于精确直线曲柄滑块机构（向导“精确线性”里的type-1）。b的长度可以自由选择，较大的取值会减小耦合点的直线偏差。

Hoecken

The coupler point for this mechanism has nearly constant velocity along the center portion of the straight line motion (when driving the crank). Applying a x-input motion at the coupler is not adviced.

该机构的耦合点沿直线中心部分的运动近乎等速（当驱动曲柄时）。不建议在耦合点处进行X输入运动。

SAM6.1设计软件获取链接：http://www.xdowns.com/soft/17/161/2010/Soft_65909.html

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