CN207554203U - Cylinder head lower water jacket and engine - Google Patents

Abstract

The utility model provides a cylinder head lower water jacket, which comprises a lower water jacket body and a valve arranged in the lower water jacket body, a cooling water jacket arranged around the valve is arranged in the lower water jacket body, and the cooling water jacket includes a valve located between the two valves. Nose bridge area; the cross section of the nose bridge area is a straight passage extending from the outer ring of the valve to the inner ring of the valve. The cooling water is circulated by the cooling water jacket through the nose bridge area between the valves. Due to the straight-through channel structure of the nose bridge area, the flow rate of the cooling water increases after the cooling water flows into the nose bridge area, and the heat transfer capacity to the valve wall is enhanced. By increasing the flow rate of the cooling water Realize the rapid removal of heat and improve the cooling capacity of the cooling water. At the same time, due to the straight-through channel structure in the nose bridge area, the valve wall thickness in the nose bridge area is unequal, and the partial thickness of the valve wall increases the structural strength of the cylinder head. The utility model also provides an engine with the above-mentioned water jacket structure under the cylinder head.

Description

Water jacket under cylinder head and engine

technical field

The utility model relates to the technical field of engines, in particular to a water jacket under a cylinder head and an engine.

Background technique

The degree of strengthening of modern engines is getting higher and higher, the explosion pressure in the cylinder is getting higher and higher, and the thermal load and mechanical load on the cylinder head are getting higher and higher.

As shown in FIG. 1 , FIG. 1 is a schematic diagram of a cross-sectional structure of a cylinder head in the prior art.

The lower water jacket of the existing cylinder head, the cooling water jacket 3` is formed between the lower water jacket body 1` and the valve 2`, and the nose bridge area 4` of the valve is formed between the adjacent valves 2`, which is suitable for the cylindrical structure of the valve, and the nose bridge The structure of zone 4` usually adopts circular arc design. According to the conformal design of the valve seat ring and air passage structure, the cylinder head designed in this way is basically of equal wall thickness in the area of the lower water jacket, so that the existing cylinder head cooling water jacket cannot meet the requirements of cylinder head cooling. Demand, the temperature of the cylinder head, especially its nose bridge area, is too high, exceeding the material limit, and the cylinder head is cracked and damaged.

Therefore, how to improve the cooling capacity of the water jacket under the cylinder head is an urgent problem to be solved by those skilled in the art.

Utility model content

In view of this, the utility model provides a water jacket under the cylinder head to improve the cooling capacity of the water jacket under the cylinder head; the utility model also provides an engine.

In order to achieve the above object, the utility model provides the following technical solutions:

A cylinder head lower water jacket, comprising a lower water jacket body and a valve arranged in the lower water jacket body, a cooling water jacket arranged around the valve is arranged in the lower water jacket body, and the cooling water jacket includes The nose bridge area between the two valves; the cross section of the nose bridge area is a straight passage extending from the outer ring of the valve to the inner ring of the valve.

Preferably, in the water jacket under the cylinder head, the cross section of the nose bridge area between any two valves is a straight passage.

Preferably, in the water jacket under the cylinder head, the minimum valve wall thickness of the valve at the position of the straight-through passage is not less than the minimum valve wall thickness of the valve outer ring.

Preferably, in the water jacket under the cylinder head, the wall thickness of the valve at the entrance and root of the straight passage is greater than the wall thickness of the valve outer ring.

An engine comprises an engine body and a water jacket under the cylinder head arranged in the engine body, and the water jacket under the cylinder head is the water jacket under the cylinder head as described in any one of the above items.

The cylinder head lower water jacket provided by the utility model includes a lower water jacket body and a valve arranged in the lower water jacket body, and a cooling water jacket arranged around the valve is arranged in the lower water jacket body, and the cooling water jacket includes a nose bridge area located between the two valves ; The cross-section of the nose bridge area is a straight passage extending from the outer ring of the valve to the inner ring of the valve. When the cooling water cools the body of the lower water jacket, the cooling water jacket circulates through the nose bridge area between the valves. Due to the straight-through channel structure of the nose bridge area, the flow rate of the cooling water increases after the cooling water flows into the nose bridge area, and the heat transfer capacity of the valve wall Enhanced, by increasing the flow rate of cooling water to quickly take out the heat and improve the cooling capacity of the cooling water. At the same time, due to the straight-through channel structure in the nose bridge area, it adapts to the structure of the valve cylinder cross section, so that the valve wall thickness of the valve in the nose bridge area is unequal, and the local thickness of the valve wall increases to improve the structural strength of the cylinder head.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is the cross-sectional structure schematic diagram of cylinder head in the prior art;

Fig. 2 is a cross-sectional schematic diagram of the water jacket under the cylinder head provided by the utility model.

Detailed ways

The utility model discloses a water jacket under the cylinder head, which improves the cooling capacity of the water jacket under the cylinder head; the utility model also provides an engine.

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without creative efforts belong to the protection scope of the present utility model.

As shown in Fig. 2, Fig. 2 is a cross-sectional schematic diagram of the water jacket under the cylinder head provided by the utility model.

The utility model provides a cylinder head lower water jacket, comprising a lower water jacket body 1 and a valve 2 arranged in the lower water jacket body 1, a cooling water jacket 3 arranged around the valve 2 is arranged in the lower water jacket body 1, and the cooling water jacket 3 includes The nose bridge area 4 located between the two valves 2 ; the cross section of the nose bridge area 4 is a straight passage extending from the outer ring of the valve 2 to the inner ring of the valve 2 . When the cooling water cools the lower water jacket body 1, the cooling water jacket 3 circulates through the nose bridge area 4 between the valves 2. Due to the straight-through channel structure of the nose bridge area 4, the cooling water flow rate increases after the cooling water flows into the nose bridge area 4. The heat exchange capacity of the valve wall is enhanced, and the heat can be taken out quickly by increasing the flow rate of the cooling water, and the cooling capacity of the cooling water is improved. At the same time, due to the straight-through channel structure in the nose bridge area 4, the structure of the cylinder cross section of the valve 2 is adapted, so that the valve wall thickness of the valve 2 in the nose bridge area 4 is unequal, and the increase in the local thickness of the valve wall improves the structural strength of the cylinder head.

It should be noted that, the valve outer ring and the valve inner ring referred to here, the valve outer ring refers to the area where the cooling water jacket is located in the outer circumferential direction of the valve; the valve inner ring refers to the area where cooling water flows into multiple valves through a straight passage . The straight-through channel structure refers to the vertical end surface of the nose bridge area along the valve axis, and has the same area along the cooling water flow direction.

In a specific embodiment of the present case, the cross section of the nose bridge region 4 between any two valves 2 is a straight passage. For the water jacket under the cylinder head of the four-cylinder structure, four valve passages are arranged in it, and the nose bridge area 4 is formed between any two adjacent valves 2, and the cross section of the nose bridge area 4 between any two valves 2 is set as The straight-through channel makes the structural strength of each valve 2 consistent, and the nose bridge area 4 between adjacent valves 2 has the same heat exchange capacity, which improves the uniform heat exchange capacity of the nose bridge area 2 in the water jacket under the cylinder head, and flows in from the cooling water jacket 3 The circulation of cooling water in the nose bridge area 4 has been improved. By increasing the flow velocity of the cooling water in the nose bridge area 4, the cooling water can effectively exchange heat with the nose bridge area 4, which has a higher temperature in the water jacket under the cylinder head, and reduce the temperature of the cylinder head. Since the cross-section of the nose bridge area 4 between any two valves 2 is a straight passage, the wall thickness of any valve at the nose bridge area 4 is of unequal thickness structure, so that the structural strength of each valve is improved , Improve the strengthening degree of the cylinder head as a whole.

In a specific embodiment of the present case, the minimum valve wall thickness of the valve 2 at the position of the straight passage is not less than the minimum valve wall thickness of the valve outer ring. Because the wall thickness of the valve 2 in the nose bridge area 4 is of unequal thickness structure, when the water jacket under the cylinder head is working, as the temperature in the engine rises, the deformation of the valve at different wall thickness positions is different. In order to ensure that the valve is in the engine For stable working ability under high temperature conditions, the minimum valve wall thickness of the valve 2 at the position of the straight-through passage is set to be not less than the minimum valve wall thickness of the outer ring of the valve, that is, the wall thickness of the valve is not lower than the minimum valve wall thickness at each position, Then the structural strength of each position of the valve is ensured as a whole.

In a specific embodiment of the present case, the wall thickness of the valve 2 located at the entrance and the root of the through channel is greater than the valve wall thickness of the outer ring of the valve.

The minimum valve wall thickness of the valve 2 at the position of the straight-through channel. Due to the straight-through channel structure of the nose bridge area 4, the thickness of the outer ring of the valve 2 is thicker on the side close to the cooling water channel 3, and along the straight-through channel inward, the wall thickness of the valve 2 Gradually thinning, when the minimum valve wall thickness position of the valve wall thickness is crossed, the valve wall thickness gradually becomes thicker to ensure that the vertical cross-sectional area of the straight-through channel along the valve axis is the same, and to avoid the slow flow of cooling water in the nose bridge area from affecting the replacement. heat capacity.

The cross-section of the outer ring of the valve 2 along its radial direction has a structure of unequal thickness along the circumferential direction of the valve. In order to ensure the stability of the working structure of the valve, the wall thickness of the outer ring of the valve needs to be adjusted adaptively to prevent the valve from being close to the bridge of the nose. The deformation of the inner circle of the area away from the bridge of the nose is inconsistent with that of the outer circle of the area away from the bridge of the nose.

Based on the water jacket under the cylinder head provided in the above-mentioned embodiment, the utility model also provides an engine, including an engine body and a water jacket under the cylinder head arranged in the engine body, the water jacket under the cylinder head provided on the engine is The water jacket under the cylinder head provided in the above embodiments.

Since the engine adopts the water jacket under the cylinder head of the above-mentioned embodiment, please refer to the above-mentioned embodiment for the beneficial effects brought by the water jacket under the cylinder head of the engine.

The above description of the disclosed embodiments enables those skilled in the art to realize or use the utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims (5)

1. A cylinder head lower water jacket, characterized in that, comprises a lower water jacket body and an air valve arranged in the lower water jacket body, a cooling water jacket arranged around the air valve is arranged in the lower water jacket body, and the cooling water The sleeve includes a nose bridge area located between two adjacent valves; the cross section of the nose bridge area is a straight channel extending from the outer ring of the valve to the inner ring of the valve. 2. The water jacket under the cylinder head according to claim 1, characterized in that, the cross-section of the nose bridge area between any two valves is a straight passage. 3 . The water jacket under the cylinder head according to claim 2 , wherein the minimum valve wall thickness of the valve at the position of the straight passage is not less than the minimum valve wall thickness of the valve outer ring. 4 . 4 . The water jacket under the cylinder head according to claim 3 , wherein the valve wall thickness of the valve located at the entrance position and the root position of the straight-through passage is greater than the valve wall thickness of the valve outer ring. 5 . 5. An engine comprising an engine body and a cylinder head water jacket arranged in the engine body, characterized in that the cylinder head water jacket is the cylinder head water jacket according to any one of claims 1-4. set.