Dual-cooled engine

Abstract

The invention discloses a dual-cooled engine. A crankshaft or a cam shaft of an engine body of the dual-cooled engine extends outwards or is connected with an output end. A cooling water pump is installed at the output end. The cooling water pump comprises an elastic impeller, a pump body, a water inlet unit, a water outlet unit and at least one blocking part, wherein the elastic impeller is installed at the output end; the pump body is installed on the elastic impeller; the water inlet unit is connected to the pump body and communicated with the interior of the pump body; the water outlet unit is perpendicular to the water inlet unit and is connected to the pump body and communicated with the interior of the pump body; the blocking part is installed between the inner wall of the pump body and the elastic impeller and also located between a water inlet joint and a water outlet joint. By using the cooling water pump of the dual-cooled engine, the installation space is reduced; in addition, the structure is simple, maintenance is convenient, and the cost is low; meanwhile, when the cooling water pump is installed on an air-cooled engine, the cooling efficiency of the whole air-cooled engine is improved; the original air cooling function of the engine is effectively integrated, and thus a more excellent cooling effect is achieved.

Description

technical field [0001] The invention relates to an engine, in particular to a dual-cooling engine. Background technique [0002] For air-cooled engines, since the heat transfer coefficient of air is only 1 / 20 to 1 / 30 of that of water, and the specific heat capacity of air is only 1 / 4 of that of water, the temperature of engine cylinder head, cylinder block and other parts after heating is high. To obtain sufficient cooling for an air-cooled engine, not only must the cooling fins be arranged reasonably, but also a large air flow rate is required. After being heated, the rigidity of the cylinder block and cylinder head will become poor, and it will also cause uneven cooling surface and high thermal load. High, high power consumption of the fan and high noise during operation, and the uneven cooling surface will also cause poor lubrication, resulting in serious early wear of the moving accessories. The above problems not only greatly affect the service life of the engine, but ...

AI Technical Summary

Problems solved by technology

[0005] (1) Power loss of belt drive

[0006] (1) Sliding loss: When the belt is working, due to the tension difference on both sides of the pulley and the corresponding deformation difference to form elastic sliding, resulting in the speed loss of the pulley and the driven wheel, elastic sliding and load, speed, pulley diameter and belt The structure is related, the elastic slip rate is usually between 1% and 2%, and some belt transmissions also have geometric slip, which will cause slippage when overloaded, making the movement of the belt in an unstable state, the efficiency drops sharply, and the wear is aggravated. life of the belt;

[0007] (2) Hysteresis loss: The belt will expand and contract repeatedly during operation, especially the winding on the pulley will cause friction inside the belt body and cause power loss;

[0008] (3) Loss caused by air resistance: During high-speed transmission, the wind resistance in motion will cause torque loss, and the loss value is proportional to the square of the speed

[0009] (4) Friction loss of the bearing: when the belt is working, the bearing is subjected to the tension of the belt, which also causes torque loss. The loss of the sliding bearing is 2%-5%, and the loss of the rolling bearing is 1%-2%.

[0010] Considering the above loss, the efficiency of belt transmission is about 80%-90%, and it cannot achieve complete transmission effect.

[0011] (2) The installation structure is complex

[0012] (1) Since the water pump is connected to the output end of the engine, an external installation mechanism is required, and the installation mechanism needs to occupy a large space;

[0013] (2) Since the belt will loosen during use and cause the belt to slip, the belt drive needs to be equipped with a tensioning mechanism. The design and installation of the tensioning mechanism has caused the complexity of the entire machine and complicated maintenance operations. sex;

[0014] (3) The structure of the water pump itself is complex. Due to the complexity of the structure, maintenance is complicated, and due to the complexity of the structure, the price is relatively expensive

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