2.2.6 Tension Unit 张紧装置
On the opposite side of the drive unit the tension unit is placed. It is used to stress both dozer chains. The tension has to amount approximately 1,6-times of the at most drive force. To achieve the tension a tension unit (track tensioner) is installed which produces the essential tension force via springs or hydraulic cylinder (elastomer damper). Figure 19 shows the elastomer damper as an example of a tension unit.
张紧装置定位在与驱动装置相对的一侧。它用来拉紧两条推送链。张力必须达到最大驱动力的1.6倍。张紧装置便是为达到这一张力而安装的（履带张紧器），它通过弹簧或液压缸（弹性体阻尼器）来产生必要的张力。图19显示了作为张紧器实例的弹性阻尼器。

Track roller 托辊
Support beam 支承梁
Pan 输送盘
Idler wheel 惰轮
Tension frame 张力架
Flux reverser plate 反流板
Elastomer damper 弹性挡板
Distance bolt 定距螺栓
Guiding rail 导轨

Figure 19: Elastic damper with tension frame and idler wheels.
图 19：带张力架和惰轮的弹性阻尼器

As can be seen in Figure 16 the tension unit consists of:
如图16所示，张紧装置的组成部分包括：
? tension frame, 张力架
? idler wheels, 惰轮；
? elastomer damper and  弹性阻尼器
? connecting elements.  连接构件。

The tension frame and the idler wheels which are bolted to the tension frame are shown in Figure 20. They can be moved on the base frame via the elastic damper. A distance bolt can be bolted to the tension frame to transfer the force from the elastic damper.
图20显示张力架和惰轮，后者用螺栓连接到张力架上。它们可以通过弹性阻尼器来移动到张力架上。在张力架上可以安装定距螺栓，以便将力从弹性阻尼器中转移走。

Distance bolt 定距螺栓
Tension frame 张力架
Idler wheel 惰轮

华译网北京翻译公司翻译过大量有关张紧装置的文件资料,Beijing Chinese Translation Service Company has translated many technical documents about Tension Unit

Figure 20: Tension frame and idler wheels.
图 20：张力架和惰轮
The elastomer damper is not only used for generating the tension force but al-so for absorbing impact loading. Its design can be seen in Figure 21.
弹性阻尼器不仅用来产生张力，而且还用来吸收冲击载荷。它的设计从图21便可以看出。
Piston 活塞
Support beam 支承梁
Grease nipple 滑脂嘴
Inside cylinder 内缸
Outside cylinder 外缸

Figure 21: Elastomer damper as an example for the tension unit.
图 21：作为张紧装置实例的弹性阻尼器
Grease which is fed through a grease nipple fills the chamber between inside and outside cylinder and moves the inside cylinder to reach a specific pre-loading. On the other side silicone which does not flocculate until temperature of -45°C is arranged between piston and inside cylinder. The amount of grease in the crease chamber determines how much the silicone is squeezed by the piston, i.e. it determines the tension force. For a safe and durable operation the piston is normally made of stainless steel 1.4021 and the cylinders are made of 42 Cr Mo 4 or St 52. Additionally the surface of the inside cylinder is rust-protected and hardened (65 HRC) since it has partial contact with the envi-ronment. Moreover this kind of tensioner offers the following distinct ad-vantages:
通过滑脂嘴来喂送的滑脂填充了内缸与外缸之间的腔室，并移动内缸、使其达到特定的预载荷。在另一侧，活塞与内缸之间则填注了硅胶，这种材料在-45°C以上不会产生絮凝。滑脂室中的滑脂量决定了活塞会挤出多少硅胶，也就是说，它决定了张力。为了操作的安全与持久，活塞通常由规格1.4021的不锈钢制成，而液压缸则采用42 Cr Mo 4铬钼合金钢或不锈钢St 52。此外，内缸的表面采用了锈蚀防护，并经过硬化（洛氏硬度65），因为它有一部分要与环境接触。此外，这种类型的张紧器还具备如下突出的优点：
? maintenance free, 免维护；
? compact installation, 安装紧凑；
? inside cylinder (grease cylinder) for chain pre adjustment,
内缸（滑脂液压缸）可用于链条的预调节；
? low block tension when using “valve-controlled” system,
在使用“阀门控制”系统时，底座张力比较低。
? prolonged durability of all components owing to smoother and delayed expansion of the tension system, fully re-usable, i.e. here at last is a ten-sioner that can be repaired and reconditioned like other track compo-nents, which of course has never been possible before with steel spring systems.
由于张紧系统平滑和延迟的扩张，所有部件都能够延长使用寿命。这种张紧系统是完全可以回收再用的，或者说，至少这种张紧器可以修理并重新恢复状态，与其它履带部件一样，当然，这在使用钢制弹簧系统之前是绝不可能的。