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HIGH-DRIVE CRAWLERS

机译：高的爬虫

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Peter J. Longfoot looks at the latest generation of elevated-sprocket designs. As we saw last month in the first part of this feature, the 'high-drive' or elevated sprocket concept for track-type tractors has been around for a very long time. But it engendered very limited interest and probably even less commercial success. So why did Caterpillar begin to take the idea seriously - a move that eventually changed the whole notion of what a crawler tractor should be? Back in 1954, soon after the D9 had been placed on the market, the Caterpillar Tractor Company (today Caterpillar Inc) realised customers would eventually demand an even larger tractor. Consequently, the company's Research & Development Department began considering designs. By the mid-1960s, the demand for more power had become a reality. Caterpillar met that demand with the DD9G, which we described in the previous issue. To recap, it consisted of two D9s joined together either side-by-side or in tandem to give a total output of around 700hp. This arrangement was unwieldy and very expensive to maintain.
机译：Peter j . Longfoot看着最新一代高驱动的设计。月的第一部分这一特性,“高”或高架链轮概念履带推土机拖拉机已经存在了一个长时间。兴趣和可能更少的商业成功。严重——此举最终改变了想法整个概念的履带拖拉机是什么?放在市场上,履带拖拉机公司(今天卡特彼勒公司)实现客户最终需求更大拖拉机。开发部门开始考虑设计。到1960年代中期,要求更多的权力成为现实。DD9G,我们在前面的描述问题。一起并排或串联总产量约700马力。是笨拙,维护起来非常昂贵。

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