CN111502853A

CN111502853A - Cooling structure between two cylinder holes of engine cylinder body

Info

Publication number: CN111502853A
Application number: CN202010355388.2A
Authority: CN
Inventors: 陈晓克; 韦齐峰; 樊心龙; 潘嗣; 王春玲; 孙朝进; 董家枝; 仇海龙; 吴剑辉
Original assignee: Guangxi Yuchai Machinery Co Ltd
Current assignee: Guangxi Yuchai Machinery Co Ltd
Priority date: 2020-04-29
Filing date: 2020-04-29
Publication date: 2020-08-07

Abstract

The invention discloses a cooling structure between two cylinder holes of an engine cylinder body, which is characterized in that: the cylinder block comprises a cylinder block body, two water jackets extending along the length direction of the cylinder block body, and at least two cylinder holes arranged between the two water jackets and used for accommodating pistons; the gap between every two adjacent cylinder holes is a cast solid body, two inclined water channels are arranged on the solid body in a crossed mode, the bottoms of the two inclined water channels are communicated with each other, and the tops of the two inclined water channels are respectively communicated with the two water jackets; when the cylinder hole is in a state of accommodating a piston, the height of a crossing point of the bottom communication of the two inclined water channels is positioned between the highest piston ring and the lowest piston ring of the piston. The invention solves the problems of poor cooling effect of the water jacket and cutter breakage in the machining process in the prior art, can improve the cooling efficiency and improve the machining yield of the cylinder block.

Description

Cooling structure between two cylinder holes of engine cylinder body

Technical Field

The invention relates to the field of engine structures, in particular to a cooling structure between two cylinder holes of an engine cylinder body.

Background

Communication between the two cylinders of the engine cylinder block is required so that the coolant flows to remove heat generated during engine combustion between the two cylinders. When the casting wall thickness X between the two cylinders of the cylinder block is less than or equal to 10mm, the water jacket between the two cylinders is difficult to communicate in a casting mode and must be communicated in a machining mode. The height from the communication intersection point of the water jacket between the two cylinders to the top surface of the cylinder block is too large, so that the cooling effect on the top of the piston is poor, and the reliability of the engine is influenced; if the intersection point is too high, the cutter is too long, the cutter is broken in the machining process, and the yield is influenced. If the height of the water jacket communication intersection point between the two cylinders from the top surface of the cylinder block is too small, the whole cooling is insufficient, and the reliability of the engine is influenced.

Disclosure of Invention

Aiming at the existing defects, the invention aims to provide a cooling structure between two cylinder holes of an engine cylinder block, which solves the problems of poor cooling effect of a water jacket and cutter breakage in the machining process in the prior art, and can improve the cooling efficiency and the machining yield of the cylinder block.

The technical scheme of the invention is as follows:

a cooling structure between two cylinder holes of an engine cylinder block comprises a cylinder block body, two water jackets extending along the length direction of the cylinder block body, and at least two cylinder holes arranged between the two water jackets and used for accommodating pistons, wherein the cylinder holes are sequentially arranged along the length direction of the cylinder block body; the gap between every two adjacent cylinder holes is a cast solid body, two inclined water channels which extend from the top to the bottom of the solid body and are arranged in a crossed mode are arranged on the solid body, the bottoms of the two inclined water channels are communicated with each other, and the tops of the two inclined water channels are respectively communicated with the two water jackets; when the cylinder hole is in a state of accommodating a piston, the height of a crossing point of the bottom communication of the two inclined water channels is positioned between the highest piston ring and the lowest piston ring of the piston.

The present invention is to limit the crossing point of the crossing inclined water passage between the highest piston ring and the lowest piston ring of the piston, and to allow cooling water to enter the adjacent cylinder holes of the cylinder block through the crossing inclined passage in a state where the cylinder holes accommodate the piston

In the middle, a runner surrounding the top of the piston is added by taking water as a branch of the cooling water jacket, and the heat of the hottest top of the piston can be rapidly taken away by the intersection point of the runner, so that the probability of thermal deformation of the top of the piston and the cylinder body is reduced; the intersection point of the two inclined water channels is limited above the piston ring at the lowest position, so that the phenomenon that the cutter is broken due to overlong inclined water channels in the machining process is avoided; therefore, the scheme solves the problem that the cooling water channel between the two cylinders is too high or too low to cause poor cooling of the piston or the cutter is broken in the machining process in the prior art, and achieves the purpose of the invention.

Specifically, the two inclined water channels are arranged in a crossed mode and are in one of x-type communication, y-type communication and v-type communication.

Specifically, the aperture of the inclined water channel is 2mm-5 mm.

The main differences and beneficial effects of the prior art of the invention are as follows:

the crossed inclined water channels are arranged between the adjacent cylinder holes of the cylinder body, so that the water jackets on the two sides are mutually communicated, the cooling effect of the cylinder body between the cooling water jackets is improved, and the cross points of the crossed inclined water channels are limited to be positioned between the piston ring at the highest position and the piston ring at the lowest position of the piston, and the maximum temperature near one ring can be reduced by about 5-7 percent compared with the traditional cylinder body through CAE simulation analysis; the height limitation of the intersection points improves the finished product rate of the inclined water channel processing of the cylinder block and reduces the manufacturing cost of the cylinder block.

Drawings

Fig. 1 is a schematic view of a cylinder block illustrating a cooling structure between two cylinder bores of an engine cylinder block according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a sloped water way according to an embodiment of the present invention.

FIG. 3 is a schematic view of a piston according to an embodiment of the present invention.

FIG. 4 is a schematic diagram of the cross-channel X-type communication of the present invention.

FIG. 5 is a schematic view of the cross Y-shaped communication of the oblique water way of the present invention.

Fig. 6 is a schematic diagram of CAE simulation analysis performed on a conventional cylinder block.

Fig. 7 is a schematic diagram of CAE simulation analysis performed on a cylinder block according to an embodiment of the present invention.

In the figure, 1-cylinder block body, 2-left water jacket, 3-right water jacket, 4-first cylinder hole, 5-second cylinder hole, 6-third cylinder hole, 7-fourth cylinder hole, 8-left inclined water channel, 9-right inclined water channel, 10-piston, 11-intersection point, 12-highest piston ring and 13-lowest piston ring.

Detailed Description

In order to explain the technical content, the achieved objects and the effects of the present invention in detail, the following description is made in conjunction with the embodiments and the accompanying drawings. In the description of the present embodiments, it is to be understood that the terms indicating an orientation or positional relationship are based on the orientation or positional relationship shown in the drawings only for the convenience of describing the present embodiments and for simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

The present embodiment is exemplified in connection with a four-cylinder engine, and as shown in fig. 1 to 3, a cooling structure between two cylinder bores of an engine cylinder block according to an embodiment of the present invention includes a cylinder block body 1, two water jackets extending along a length direction of the cylinder block body 1, a left water jacket 2 and a right water jacket 3; and four cylinder bores for accommodating pistons, which are respectively a first cylinder bore 4, a second cylinder bore 5, a third cylinder bore 6, and a fourth cylinder bore 7, provided between the left water jacket 2 and the right water jacket 3; the gap between two adjacent cylinder holes is a cast solid body, two inclined water channels are arranged on the solid body in a crossed manner, as shown in fig. 2, the two inclined water channels are a left inclined water channel 8 and a right inclined water channel 9 respectively, the bottom of the left inclined water channel 8 is communicated with the bottom of the right inclined water channel 9, the top of the left inclined water channel 8 is communicated with the top of the left water jacket 2, and the top of the right inclined water channel 9 is communicated with the top of the right water jacket 3; when the cylinder hole is in a state of accommodating the piston 10, the height of a crossing point 11 of the communication between the bottoms of the left inclined water channel 8 and the right inclined water channel 9 is located between a highest piston ring 12 and a lowest piston ring 13 of the piston 10.

The cylinder block cooling principle of the present embodiment is as follows:

the invention arranges crossed inclined water channels between each adjacent cylinder holes of the cylinder block body 1 to enable the water jackets at two sides to be communicated with each other, the crossed point of the crossed inclined water channels is limited to be positioned between the piston ring 12 at the highest position and the piston ring 13 at the lowest position of the piston, when the cylinder holes accommodate the piston 10, cooling water enters between the adjacent cylinder holes of the cylinder block body 1 through the crossed inclined channels, the flow channel surrounding the top of the piston 10 is increased as the branch water taking of the cooling water jacket, the heat of the hottest top of the piston 10 can be rapidly taken away by the crossed point of the flow channel, and the probability of thermal deformation of the top of the piston 10 and the cylinder block is reduced; the inclined water channel can be formed by machining, the cross point of the two inclined water channels is limited above the lowest piston ring 13, the problem of cutter breakage caused by overlong inclined water channel in the machining process is solved, the inclined water channel formed by machining is adopted to replace a special-shaped channel formed by casting between two cylinder holes of the existing engine cylinder block, the casting is simple, the sand cleaning is easy, the wall thickness is easy to control, and the yield is improved; therefore, the embodiment solves the problem that the piston 10 is not well cooled or the cutter is broken in the machining process due to the fact that the position of the cooling water channel between the two cylinders is too high or too low in the prior art, and achieves the purpose of the invention.

As a preferable scheme of the present embodiment, the two oblique water passages are arranged in a crossing manner in a V-shaped communication manner, and may also be arranged in an x-shaped communication manner or a y-shaped communication manner, as shown in fig. 4 and 5, specifically, the two oblique water passages may be arranged in an x-shaped communication manner, a y-shaped communication manner, or a V-shaped communication manner according to the actual situation of the internal space of the cylinder block, and the two oblique water passages are arranged in a crossing manner in an x-shaped communication manner or a y-shaped communication manner, so that; the inclined water channel is fed from the top surface of the cylinder body in a machining mode, holes on two sides are machined to form channels and are communicated with each other, the longer inclined water channel can be machined firstly in the x-shaped inclined water channel, then the shorter inclined water channel is machined to form a channel communicated with the two water jackets, and the machining precision requirement is further reduced; or the Y-shaped water channel can be processed at any side of the water channel in advance, so that the processing is further convenient.

As the preferable scheme of the embodiment, the aperture of the inclined water channel is between 2mm and 5 mm. Considering the thickness of the solid body between the two cylinders, if the thickness of the solid body between the two cylinders is relatively large, for example, greater than 12mm as a general case, the water flow path between the two cylinders can be realized by casting without machining. However, under the condition of compact engine space, if the thickness of the solid body between the two cylinders is relatively small, such as 10mm in the embodiment, the water flow between the two cylinders can only be realized by processing a cross hole. The diameter of the inclined water passage is preferably relatively small, but the cooling performance may be reduced when the diameter of the inclined water passage is small. At this moment, the aperture size of the maximum cross hole needs to be controlled, for example, the aperture size is controlled to be 2-5 mm, the wall thickness of a single side is 2.5-4 mm, the rigidity and the cooling temperature of the cross hole are balanced, the cross hole is an ideal wall thickness, and the cross hole can be adjusted according to actual conditions.

According to the present invention, the CAE simulation analysis is performed on the cylinder block of the present embodiment, and compared with the existing cylinder block, fig. 6 is a temperature analysis of a cooling water channel of the existing cylinder block, and fig. 7 is a cooling temperature analysis of the cylinder block of the present embodiment after adding an inclined water channel and defining the position of the inclined water channel, and the result shows that the temperature near the piston ring 12 at the high position of the piston 10 of the existing cylinder block is between 220.92 ℃ and 241.23 ℃, and the temperature near the piston ring 12 at the high position of the piston 10 of the present embodiment is between 177.72 ℃ and 187.12 ℃, which shows that the cylinder block of the present embodiment can reduce the maximum temperature near the piston ring 12 at the high position of the piston 10 by about 5% to 7%.

Although the invention has been described in detail above with reference to specific embodiments, it will be apparent to one skilled in the art that modifications or improvements may be made based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.

Claims

1. A cooling structure between two cylinder bores of an engine cylinder block, characterized in that: the cylinder block comprises a cylinder block body, two water jackets extending along the length direction of the cylinder block body, and at least two cylinder holes arranged between the two water jackets and used for accommodating pistons, wherein the cylinder holes are sequentially arranged along the length direction of the cylinder block body; the gap between every two adjacent cylinder holes is a cast solid body, two inclined water channels which extend from the top to the bottom of the solid body and are arranged in a crossed mode are arranged on the solid body, the bottoms of the two inclined water channels are communicated with each other, and the tops of the two inclined water channels are respectively communicated with the two water jackets; when the cylinder hole is in a state of accommodating a piston, the height of a crossing point of the bottom communication of the two inclined water channels is positioned between the highest piston ring and the lowest piston ring of the piston.

2. The cooling structure between two cylinder bores of an engine block according to claim 1, characterized in that: the two inclined water channels are arranged in a crossed mode and are communicated in an x-type mode, a y-type mode or a v-type mode.

3. The cooling structure between the two cylinder bores of the engine block according to claim 1 or 2, characterized in that: the aperture of the inclined water channel is 2mm-5 mm.