Single-engine crane and power transmission device thereof

Abstract

The invention relates to a single-engine crane and a power transmission device thereof. The power transmission device for the single-engine crane comprises a lower crane engine, a rotation driving mechanism and an upper crane transfer case, wherein the lower crane engine capable of providing power for a lower crane front drive axle and a lower crane rear drive axle is connected with the upper crane transfer case by the rotation driving mechanism; the rotation driving mechanism can be used for driving the upper crane transfer case by a torque and / or power provided by the lower crane engine; each power output hole of the upper crane transfer case is respectively connected with each upper crane hydraulic pump. According to the power transmission device for the single-engine crane, which is disclosed by the invention, a problem of narrow space caused by that the upper crane is provided with an independent power system can be solved, weight is lightened, and the cost of the whole crane is lowered.

Description

Technical field [0001] The invention relates to the field of engineering machinery, in particular to a single-engine crane and its power transmission device. Background technique [0002] Such as figure 1 As shown, in the field of construction machinery, a mobile crane is usually divided into an upper car 1'part and a lower car 2'part, and the upper car 1'is connected to the lower car 2'through a slewing support 3'. The function of getting off the car 2'is to act as a heavy-duty vehicle during driving; the function of getting off the car 1'is to carry out lifting operations. When the getting off car 1'is working, a 360-degree turning action is required on the getting off car 2'. [0003] At present, there are two supporting schemes for the power system of the mobile crane: a single-engine power system, which shares the same engine for getting on and off the vehicle, and performs road driving and lifting operations; a dual-engine power system, where the off-car engine executes road ...

AI Technical Summary

Problems solved by technology

When the engine starts, the starter motor works together with the transfer case and the hydraulic oil pump. At this time, the load resistance of the entire transmission system is relatively large. Especially in low temperature environments, the viscosity of the oil in the transfer case and the hydraulic oil in the hydraulic transmission system increases. , so that the resistance torque that the starter motor needs to overcome increases, even exceeding the maximum torque that the starter motor can provide, resulting in the failure of the engine to start

At present, the transfer case of the large-tonnage engineering cranes used at home and abroad cannot be equipped with a clutch, and the connection mode of engine-clutch-gearbox cannot be used.

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