1. Due to there is no manufacture of air expansion differential shafts in the past few years, all of them relied on imports, and the price was expensive, which caused great economic pressure to the enterprises to be used and gave up using them.

2. Because the product grade of the enterprise is not high, the requirement for mechanical slitting is not high, the ordinary gas expansion shaft and mechanical sliding shaft can meet the basic use requirements, and the production scale of the enterprise is not large, the production pressure is not large, and there is no desire for urgent improvement, so they are not applied.

3. The propaganda of domestic manufacturers is not enough, and the supporting services are still insufficient.

4. Most manufacturers do not know enough about the functional differences between the differential air expansion shaft and the mechanical differential shaft and the ordinary air expansion shaft, especially do not have a clear understanding of the performance-price ratio of the differential air expansion shaft and other shafts, so they only think that the price of the differential air expansion shaft is higher, and there is no urgent requirement for enterprises to upgrade their products and maximize their benefits.

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