CN107701323B - Cylinder head structure of motorcycle water-cooled engine - Google Patents
Cylinder head structure of motorcycle water-cooled engine Download PDFInfo
- Publication number
- CN107701323B CN107701323B CN201710867022.1A CN201710867022A CN107701323B CN 107701323 B CN107701323 B CN 107701323B CN 201710867022 A CN201710867022 A CN 201710867022A CN 107701323 B CN107701323 B CN 107701323B
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- water
- cylinder head
- water channel
- water inlet
- combustion chamber
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 61
- 238000002485 combustion reaction Methods 0.000 claims abstract description 20
- 238000007789 sealing Methods 0.000 abstract description 13
- 239000000498 cooling water Substances 0.000 abstract description 9
- 239000010705 motor oil Substances 0.000 abstract description 4
- 239000002737 fuel gas Substances 0.000 abstract description 3
- 230000002087 whitening effect Effects 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 23
- 238000005461 lubrication Methods 0.000 description 5
- 238000002679 ablation Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 239000010687 lubricating oil Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F1/00—Cylinders; Cylinder heads
- F02F1/24—Cylinder heads
- F02F1/26—Cylinder heads having cooling means
- F02F1/36—Cylinder heads having cooling means for liquid cooling
- F02F1/40—Cylinder heads having cooling means for liquid cooling cylinder heads with means for directing, guiding, or distributing liquid stream
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F1/00—Cylinders; Cylinder heads
- F02F1/24—Cylinder heads
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
The invention discloses a cylinder head structure of a motorcycle water-cooled engine, wherein an annular closed water channel is arranged in the cylinder head around a combustion chamber, a plurality of water inlets are arranged on the lower end surface of the cylinder head, and a water outlet is arranged on the upper end surface of the cylinder head; the lower end of the inner wall of the outer layer of the water channel far away from the combustion chamber is bent outwards and downwards, so that the cross section area of the lower end of the water channel is larger than that of the upper end of the water channel; the water inlet is arranged close to the outer edge of the lower end of the water channel. The structure enlarges the volume of the water channel and increases the cooling water quantity in the cylinder head; more importantly, after the water channel is outwards expanded, the water inlet is correspondingly outwards shifted because the water inlet is close to the outer edge of the lower end of the water channel, namely, the water inlet is far away from the combustion chamber with high temperature compared with the position before the water inlet is changed, the cylinder head sealing gasket is not easily ablated due to the influence of high-temperature and high-pressure fuel gas, circulating water is easily prevented from entering the engine, and therefore engine oil whitening is avoided.
Description
Technical Field
The invention relates to a motorcycle engine, in particular to a cylinder head structure of a water-cooled engine of a motorcycle, and belongs to the technical field of motorcycle engines.
Background
In recent years, motor tricycle has become a good helper for farmers to bring home and become rich, and is also increasingly developed in the direction of large displacement. The continuous increase of the discharge capacity, the severe service environment (heavy load, poor road condition and poor maintenance of users) of the engine, the high temperature of the engine, the locking of the big end of the crankshaft, the cylinder pulling of the piston, the burning of engine oil and other faults are increased, and the poor negative influence is brought to the popularization of the engine of the large-discharge-capacity tricycle. In order to solve the problems, the water-cooled engine is widely used for tricycles, but the application and popularization of the water-cooled engine are restricted due to the high cost of the water-cooled engine and the problems of cylinder gasket flushing and the like.
The cylinder head is an important component of the engine, and the design of the water cooling structure is also important. The structure of the existing cylinder head is shown in fig. 1-3, an annular water channel is arranged in the cylinder head around a combustion chamber, a plurality of water inlets 2 corresponding to water outlets of the cylinder body are arranged on the lower surface of the cylinder head, the water inlets are in the shape of annular strips, water outlets 3 are arranged on the side surfaces of the water inlets, and the water outlets and the water inlets are communicated with the water channel.
The two side walls of the existing annular water channel are generally straight and straight, so that an annular barrel-shaped water channel is formed. Because the annular barrel-shaped water channel is nearer to the combustion chamber, the water inlet is nearer to the combustion chamber, the temperature at the water inlet is higher, and the sealing gasket between the cylinder head and the cylinder body is prone to being burnt, high-temperature and high-pressure gas is easy to enter the sealing gasket when the cylinder head end face has fine defects due to shape and position errors caused by processing, and the sealing ablation of the cylinder head is directly caused, so that circulating water outside a sealing line enters an engine, the engine is scrapped, and the normal operation and the service life of the engine are seriously influenced.
In addition, an AB keyhole 4 is provided on the cylinder head, and the cylinder head and the cylinder block are connected by a screw inserted into the AB keyhole. In order to allow lubrication of the oil from the cylinder head to the head, one of the bolt holes is designed as an upper oil hole 5, which is located at the mounting end face of the cylinder head and the head, i.e. through which the oil re-enters the head. The upper oil hole is designed as a counter bore in order to achieve the dual function of the screw connection and the lubrication channel. Meanwhile, in order to avoid the sealing gasket on the screw rod from sealing the oil passing channel after the screw rod is installed, a channel is formed below the sealing gasket on the sinking table so as to communicate the counter bore main hole with the upper surface of the sinking table, but in this way, lubricating oil can reach the cylinder head cover only after filling the counter bore from the upper oil hole, the lubrication of the upper parts is unfavorable, and the problems of abrasion, locking and the like are easily caused.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a cylinder head structure of a motorcycle water-cooled engine, which can avoid the problem that cooling water enters the engine due to high-temperature ablation of a sealing gasket.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a cylinder head structure of a water-cooled engine of a motorcycle comprises a cylinder head, wherein an annular closed water channel is arranged in the cylinder head around a combustion chamber, a plurality of water inlets are formed in the lower end face of the cylinder head, and a water outlet is formed in the upper end face of the cylinder head; the water inlet and the water outlet are respectively communicated with the water channel; the lower end of the inner wall of the outer layer of the water channel far away from the combustion chamber is bent outwards and downwards, so that the cross section area of the lower end of the water channel is larger than that of the upper end of the water channel; the water inlet is arranged close to the outer edge of the lower end of the water channel.
The structure expands the lower end of the water channel outwards, thereby expanding the volume of the water channel and increasing the cooling water quantity in the cylinder head; more importantly, after the water channel is outwards expanded, the water inlet is correspondingly outwards shifted because the water inlet is close to the outer edge of the lower end of the water channel, namely, the water inlet is far away from the combustion chamber with high temperature compared with the position before the water inlet is changed, the cylinder head sealing gasket is not easily ablated due to the influence of high-temperature and high-pressure fuel gas, circulating water is easily prevented from entering the engine, and therefore engine oil whitening is avoided.
The orthographic projection of the water inlet is positioned in the orthographic projection of the lower end of the water channel and is positioned outside the orthographic projection of the upper end of the water channel. The water inlet is arranged at the position far away from the combustion chamber, and the water inlet is smoothly connected with the water channel, so that cooling water can flow into the water channel.
The lower end of the outer inner wall of the water channel far away from the combustion chamber is smoothly connected with the upper end of the outer inner wall, and the lower end of the outer inner wall bent outwards and downwards is a circular arc-shaped concave surface. The streamline structure and the cambered surface of the outer wall of the water channel are beneficial to the entry and the outflow of cooling water.
The cylinder head is provided with AB bolt holes, and all the AB bolt holes are positioned in a space surrounded by the upper end face of the closed cylinder head; one of the AB key holes simultaneously forms an upper oil hole, a special oil outlet is arranged on the upper end face of the cylinder head, and the oil outlet is communicated with the upper oil hole through an inclined oil duct. The structure eliminates the counter bore at the upper end of the oil hole on the AB bolt, and the inclined oil hole is directly formed in the upper surface of the cylinder head and communicated with the oil hole on the AB bolt, so that the time for the lubricating oil to rise to the cylinder head is shortened, and the lubrication of the upper rocker arm support, the lower rocker arm and the cam is facilitated.
In a word, through the improvement of the engine cylinder head structure, the invention not only can avoid the problem that cooling water enters the engine due to high-temperature ablation of the sealing gasket, but also can increase the water channel volume, and further improve the water cooling effect and the lubricating effect.
Drawings
FIG. 1 is a schematic view of the lower surface structure of a conventional cylinder head.
Fig. 2-a schematic side view of a conventional cylinder head.
Fig. 3-schematic diagram of the upper surface structure of the prior cylinder head.
FIG. 4-schematic view of the lower surface structure of the cylinder head according to the present invention.
FIG. 5-schematic view of the upper surface structure of the cylinder head according to the present invention.
Description of the embodiments
The invention is described in further detail below with reference to the accompanying drawings.
Referring to fig. 4-5, it can be seen from the figure that the cylinder head structure of the water-cooled engine of the motorcycle comprises a cylinder head 1, wherein an annular closed water channel is arranged in the cylinder head around a combustion chamber, a plurality of water inlets 2 are arranged on the lower end surface of the cylinder head, and a water outlet 3 is arranged on the upper end surface of the cylinder head; the water inlet and the water outlet are respectively communicated with the water channel; the lower end of the inner wall of the outer layer of the water channel far away from the combustion chamber is bent outwards and downwards, so that the cross section area of the lower end of the water channel is larger than that of the upper end of the water channel; the water inlet is arranged close to the outer edge of the lower end of the water channel.
The structure expands the lower end of the water channel outwards, thereby expanding the volume of the water channel, increasing the cooling water quantity in the cylinder head and having slower temperature rise. More importantly, after the water channel is outwards expanded, the water inlet is correspondingly outwards shifted because the water inlet is close to the outer edge of the lower end of the water channel, namely, the water inlet is far away from the combustion chamber with high temperature compared with the position before the water inlet is changed, the cylinder head sealing gasket is not easily ablated due to the influence of high-temperature and high-pressure fuel gas, circulating water is easily prevented from entering the engine, and therefore engine oil whitening is avoided.
The invention is provided with the water outlet 3 on the upper end surface of the cylinder head, which is different from the traditional water outlet on the side surface of the cylinder head, and is more beneficial to the absorption of circulating water to the heat of the cylinder head, thereby reducing the temperature of the engine.
The orthographic projection of the water inlet is positioned in the orthographic projection of the lower end of the water channel and is positioned outside the orthographic projection of the upper end of the water channel. The water inlet is arranged at the position far away from the combustion chamber, and the water inlet is smoothly connected with the water channel, so that cooling water can flow into the water channel.
The lower end of the outer inner wall of the water channel far away from the combustion chamber is smoothly connected with the upper end of the outer inner wall, and the lower end of the outer inner wall bent outwards and downwards is a circular arc-shaped concave surface. The streamline structure and the cambered surface of the outer wall of the water channel are beneficial to the entry and the outflow of cooling water.
The cylinder head is provided with AB bolt holes 4, and all AB bolt holes 4 are positioned in a space surrounded by the upper end face of the closed cylinder head; one of the AB key holes simultaneously forms an upper oil hole 5, a special oil outlet 6 is arranged on the upper end face of the cylinder head, and the oil outlet is communicated with the upper oil hole through an inclined oil duct. The structure eliminates the counter bore at the upper end of the oil hole on the AB bolt, and the oil hole on the AB bolt is directly communicated with the oil hole on the AB bolt by arranging a 5mm inclined oil hole on the upper surface of the cylinder head, so that the time for the lubricating oil to rise to the cylinder head is shortened, and the lubrication of an upper rocker arm support, a lower rocker arm and a cam is facilitated.
In practical design, the invention designs 3-6 circular or circular strip-shaped water inlets on the lower surface of the cylinder head, so that the water channel sand core is positioned and the cooling of each part of the cylinder head is consistent, and each water inlet is far away from the combustion chamber, thus the temperature at the water inlet is relatively low, the cylinder head sealing gasket is not easy to burn and burn, and circulating water is prevented from entering the engine.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered by the scope of the claims of the present invention.
Claims (1)
1. A cylinder head structure of a water-cooled engine of a motorcycle comprises a cylinder head, wherein an annular closed water channel is arranged in the cylinder head around a combustion chamber, a plurality of water inlets are formed in the lower end face of the cylinder head, and a water outlet is formed in the upper end face of the cylinder head; the water inlet and the water outlet are respectively communicated with the water channel, and the water inlet and the water outlet are characterized in that: the lower end of the inner wall of the outer layer of the water channel far away from the combustion chamber is bent outwards and downwards, so that the cross section area of the lower end of the water channel is larger than that of the upper end of the water channel; the water inlet is arranged close to the outer edge of the lower end of the water channel;
the orthographic projection of the water inlet is positioned in the orthographic projection of the lower end of the water channel and is positioned outside the orthographic projection of the upper end of the water channel;
the lower end of the outer inner wall of the water channel far away from the combustion chamber is smoothly connected with the upper end of the outer inner wall, and the lower end of the outer inner wall bent outwards and downwards is a circular arc concave surface;
the cylinder head is provided with AB bolt holes, and all the AB bolt holes are positioned in a space surrounded by the upper end face of the closed cylinder head; one of the AB key holes simultaneously forms an upper oil hole, a special oil outlet is arranged on the upper end face of the cylinder head, and the oil outlet is communicated with the upper oil hole through an inclined oil duct.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710867022.1A CN107701323B (en) | 2017-09-22 | 2017-09-22 | Cylinder head structure of motorcycle water-cooled engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710867022.1A CN107701323B (en) | 2017-09-22 | 2017-09-22 | Cylinder head structure of motorcycle water-cooled engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107701323A CN107701323A (en) | 2018-02-16 |
| CN107701323B true CN107701323B (en) | 2024-03-01 |
Family
ID=61174279
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710867022.1A Active CN107701323B (en) | 2017-09-22 | 2017-09-22 | Cylinder head structure of motorcycle water-cooled engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107701323B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112628009B (en) * | 2020-12-21 | 2021-11-09 | 安徽竞道动力科技有限公司 | Cylinder head structure of water-cooled engine of motorcycle |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6318121A (en) * | 1986-07-09 | 1988-01-26 | Honda Motor Co Ltd | Lubrication device for valve system in overhead cam type engine |
| JPH06229218A (en) * | 1993-02-05 | 1994-08-16 | Honda Motor Co Ltd | Engine |
| EP1239135A2 (en) * | 2001-03-06 | 2002-09-11 | Toyota Jidosha Kabushiki Kaisha | Cooling structure of cylinder head and method for manufacturing cylinder head |
| CN201250680Y (en) * | 2008-08-29 | 2009-06-03 | 重庆高金实业有限公司 | Cylinder end isopiestic lubricant oil-way of single-cylinder water-cooled four-valve internal-combustion |
| CN104975931A (en) * | 2015-06-29 | 2015-10-14 | 重庆建设摩托车股份有限公司 | Whole-sealing internal circulation water cooling structure of motorcycle water-cooled engine |
| WO2016113786A1 (en) * | 2015-01-15 | 2016-07-21 | Toyota Jidosha Kabushiki Kaisha | Cylinder head |
| CN207297187U (en) * | 2017-09-22 | 2018-05-01 | 力帆实业(集团)股份有限公司 | A kind of cooling engine for motor cycle water air cylinder head structure |
-
2017
- 2017-09-22 CN CN201710867022.1A patent/CN107701323B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6318121A (en) * | 1986-07-09 | 1988-01-26 | Honda Motor Co Ltd | Lubrication device for valve system in overhead cam type engine |
| JPH06229218A (en) * | 1993-02-05 | 1994-08-16 | Honda Motor Co Ltd | Engine |
| EP1239135A2 (en) * | 2001-03-06 | 2002-09-11 | Toyota Jidosha Kabushiki Kaisha | Cooling structure of cylinder head and method for manufacturing cylinder head |
| CN201250680Y (en) * | 2008-08-29 | 2009-06-03 | 重庆高金实业有限公司 | Cylinder end isopiestic lubricant oil-way of single-cylinder water-cooled four-valve internal-combustion |
| WO2016113786A1 (en) * | 2015-01-15 | 2016-07-21 | Toyota Jidosha Kabushiki Kaisha | Cylinder head |
| CN104975931A (en) * | 2015-06-29 | 2015-10-14 | 重庆建设摩托车股份有限公司 | Whole-sealing internal circulation water cooling structure of motorcycle water-cooled engine |
| CN207297187U (en) * | 2017-09-22 | 2018-05-01 | 力帆实业(集团)股份有限公司 | A kind of cooling engine for motor cycle water air cylinder head structure |
Non-Patent Citations (1)
| Title |
|---|
| 一种新型摩托车水冷发动机的开发设计;周文全;王胜华;;摩托车技术(第02期);全文 * |
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| CN107701323A (en) | 2018-02-16 |
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