阅读说明：本技术 一种用于火花塞电极定向的火花塞孔结构及其加工方法 (Spark plug hole structure for spark plug electrode orientation and machining method thereof ) 是由 温拾平 高维进 刘勇 吴磊 于 2021-07-16 设计创作，主要内容包括：本发明公开了一种用于火花塞电极定向的火花塞孔结构及其加工方法,该火花塞孔结构包括缸盖、火花塞孔、密封铜垫和火花塞,所述缸盖上设置有缸盖排气道、缸盖进气道和火花塞孔,火花塞孔布置于缸盖排气道和缸盖进气道之间；所述火花塞密封铜垫设置于火花塞孔顶面,火花塞孔的内壁上设有内螺纹,所述火花塞通过其底部的螺纹与火花塞孔内螺纹相配合,进而固定在火花塞孔内,所述火花塞底部安装有火花塞侧电极。本发明通过对火花塞孔及其相关结构的尺寸、加工工艺的设计,使得火花塞在安装进火花塞孔后,其火花塞侧电极能够朝固定方向分布,能够有效避免火花塞干扰进气滚流分布及喷油器油束的喷雾,缩短点火延迟角,提高燃油利用率。(The invention discloses a spark plug hole structure for spark plug electrode orientation and a processing method thereof, wherein the spark plug hole structure comprises a cylinder cover, a spark plug hole, a sealing copper pad and a spark plug, wherein a cylinder cover exhaust passage, a cylinder cover inlet passage and a spark plug hole are arranged on the cylinder cover, and the spark plug hole is arranged between the cylinder cover exhaust passage and the cylinder cover inlet passage; the spark plug is characterized in that the spark plug sealing copper pad is arranged on the top surface of the spark plug hole, an internal thread is arranged on the inner wall of the spark plug hole, the spark plug is matched with the internal thread of the spark plug hole through the thread at the bottom of the spark plug, and then the spark plug is fixed in the spark plug hole, and a spark plug side electrode is arranged at the bottom of the spark plug. According to the invention, through the design of the size and the processing technology of the spark plug hole and the related structure thereof, after the spark plug is installed in the spark plug hole, the side electrodes of the spark plug can be distributed towards the fixed direction, so that the interference of the spark plug on the air inlet tumble distribution and the spray of an oil jet of an oil injector can be effectively avoided, the ignition delay angle is shortened, and the fuel utilization rate is improved.)

1. The spark plug hole structure for spark plug electrode orientation is characterized by comprising a cylinder cover (1), a spark plug hole (2), a spark plug sealing copper pad (3) and a spark plug (4), wherein a cylinder cover exhaust passage (5), a cylinder cover air inlet passage (6) and the spark plug hole (2) are arranged on the cylinder cover (1), and the spark plug hole (2) is arranged between the cylinder cover exhaust passage (5) and the cylinder cover air inlet passage (6);

the spark plug is characterized in that the spark plug sealing copper pad (3) is arranged on the top surface (7) of the spark plug hole, inner threads are arranged on the inner wall from the top surface (7) of the spark plug hole to the bottom surface (8) of the spark plug hole, the spark plug (4) is matched with the inner threads of the spark plug hole (2) through the threads at the bottom of the spark plug and then fixed in the spark plug hole (2), and a spark plug side electrode (9) is arranged at the bottom of the spark plug.

2. The spark plug hole structure for spark plug electrode orientation according to claim 1, characterized in that the internal thread of the spark plug hole (2) is tapped by a special tap (10), one end of the special tap (10) is provided with a tap clamping and positioning surface (11), the other end of the special tap is marked with a tap tapping starting point (12), and the tap tapping starting point (12) falls in the plane of the tap clamping and positioning surface (11).

3. A method of machining a spark plug hole for spark plug electrode orientation, comprising the steps of:

s1, clamping and assembling one end, provided with a screw tap clamping and positioning surface (11), of the special screw tap (10) on a tapping machine, and adjusting the tapping angle of the special screw tap (10) to be consistent with the design angle of the spark plug hole (2);

s2, adjusting the distance from a tap tapping starting point (13) marked on the other end of the special tap (10) to the top surface (7) of the spark plug hole, and enabling the tapping starting point when the special tap (10) reaches the top surface (7) of the spark plug to be consistent with the position of a tap tapping starting point (12) when the special tap is assembled on a tapping machine;

and S3, starting the tapping machine to tap the spark plug hole (2), and withdrawing the special screw tap (10) after the special screw tap (10) taps to the designed depth of the spark plug hole (2) to complete the tapping process of the spark plug hole (2).

4. The spark plug hole machining method for spark plug electrode orientation according to claim 3, wherein the distance from the tap tapping starting point (12) marked on the other end of the special tap (10) to the spark plug hole top surface (7) is adjusted in step S2 by the formula:

in the formula: b, the distance m from the tapping starting point of the special screw tap to the top surface of the spark plug hole;

v-feed speed of the threading machine, m/s;

w-rotational angular velocity, deg/s, of the tapping machine;

n is a positive integer.

5. The spark plug hole machining method for spark plug electrode orientation as claimed in claim 3, wherein said special tap (10) is withdrawn after said special tap (10) is tapped to a designed depth of the spark plug hole (2) in step S3, and the designed depth is calculated by the formula:

C＝m×p (2)

in the formula: c is the design depth from the top surface of the spark plug to the bottom surface of the spark plug, m;

p-the pitch of the spark plug bottom thread, m;

m is a positive integer.

Technical Field

The invention relates to the technical field of spark plug hole processing methods, in particular to a spark plug hole structure for spark plug electrode orientation and a processing method thereof.

Background

With the development of automobile technology in China and the increasing importance of China on oil consumption, the internal ignition type internal combustion engine increasingly applies a supercharging direct injection technology. In many existing supercharged direct injection engines, after the spark plugs are installed, the distribution of the electrode positions is random, and the distribution positions of the electrodes directly influence the ignition positions in the cylinders, so that the accurate control of the ignition is an adverse influence factor.

Under the background of increasing emission and oil consumption pressure, the new generation of ignition type internal combustion engine enables the position distribution height of an electrode to be concentrated in a specific area after a spark plug is installed through a special process and a structural design method, and accurate ignition and efficient combustion are realized through matching with air passage tumble and oil beam design of an oil sprayer, the combustion emission of the internal combustion engine is improved, and the fuel utilization rate is improved.

Disclosure of Invention

The invention aims to solve the problems and provides a spark plug hole structure for spark plug electrode orientation and a processing method thereof, which realize that the spark plug side electrodes can be distributed towards a fixed direction after the spark plug is installed in the spark plug hole through the matching design of related structure, size and processing technology.

In order to achieve the purpose, the invention adopts the following technical scheme:

a spark plug hole structure for spark plug electrode orientation comprises a cylinder cover, a spark plug hole, a spark plug sealing copper pad and a spark plug, wherein a cylinder cover exhaust passage, a cylinder cover inlet passage and the spark plug hole are arranged on the cylinder cover, and the spark plug hole is arranged between the cylinder cover exhaust passage and the cylinder cover inlet passage;

the spark plug is characterized in that the spark plug sealing copper pad is arranged on the top surface of the spark plug hole, internal threads are arranged on the inner wall from the top surface of the spark plug hole to the bottom surface of the spark plug hole, the spark plug is matched with the internal threads of the spark plug hole through threads at the bottom of the spark plug, and then the spark plug is fixed in the spark plug hole, and a spark plug side electrode is arranged at the bottom of the spark plug.

The spark plug hole internal thread is obtained by special screw tap tapping, special screw tap one end is provided with screw tap and presss from both sides tight locating surface, and the other end mark has screw tap tapping starting point, screw tap tapping starting point falls in the plane that screw tap presss from both sides tight locating surface and locates.

A method of spark plug hole machining for spark plug electrode orientation, comprising the steps of:

s1, clamping and assembling one end of a special screw tap with a screw tap clamping and positioning surface on a tapping machine, and adjusting the tapping angle of the special screw tap to be consistent with the design angle of a spark plug hole;

s2, adjusting the distance from the tapping starting point of the screw tap marked on the other end of the special screw tap to the top surface of the spark plug hole, and enabling the tapping starting point when the special screw tap reaches the top surface of the spark plug to be consistent with the tapping starting point of the screw tap when the special screw tap is assembled on a tapping machine;

and S3, starting the tapping machine, tapping the spark plug hole, and withdrawing the special screw tap after the special screw tap taps the designed depth of the spark plug hole to complete the tapping process of the spark plug hole.

In step S2, the distance from the tap tapping starting point marked on the other end of the special tap to the top surface of the spark plug hole is adjusted according to the formula:

in the formula: b, the distance m from the tapping starting point of the special screw tap to the top surface of the spark plug hole;

v-feed speed of the threading machine, m/s;

w-rotational angular velocity, deg/s, of the tapping machine;

n is a positive integer.

And in the step S3, after the special screw tap is tapped to the designed depth of the spark plug hole, the special screw tap is withdrawn, and the calculation formula of the designed depth is as follows:

C＝m×p (2)

in the formula: c is the design depth from the top surface of the spark plug to the bottom surface of the spark plug, m;

p-the pitch of the spark plug bottom thread, m;

m is a positive integer.

The invention has the beneficial effects that:

1. through the processing of the spark plug hole, the electrode orientation distribution of the spark plug is ensured to be fixed in a specific area after the spark plug is installed, and the interference of the spark plug on the air inlet tumble distribution and the spraying of the oil beam of the oil sprayer can be effectively avoided;

2. after the spark plug is directionally installed, the spark plug and the shape of the combustion chamber, the air inlet tumble and the oil spray oil beam are matched, so that the ignition delay angle can be effectively shortened, the in-cylinder combustion is improved, the combustion emission of the internal combustion engine is improved, the fuel utilization rate is improved, and the spark plug has important significance for meeting the lower emission and oil consumption regulations of a new generation of ignition type internal combustion engines.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a flow chart of a method of manufacturing a spark plug hole for spark plug electrode orientation according to the present invention;

FIG. 2 is a structural layout diagram of a cylinder head in an embodiment of the present invention;

FIG. 3 is a schematic view of the position of the spark plug holes in the cylinder head according to an embodiment of the present invention;

FIG. 4 is a schematic view showing an installation position of a spark plug according to an embodiment of the present invention;

FIG. 5 is a schematic structural view of a special tap according to an embodiment of the present invention;

fig. 6 is a schematic diagram of the tapping position of the special tap in the embodiment of the invention.

The reference numerals in the figures illustrate: 1. a cylinder cover; 2. a spark plug hole; 3. a spark plug sealing copper pad; 4. a spark plug; 5. a cylinder cover exhaust passage; 6. a cylinder head inlet channel; 7. a top surface of the spark plug hole; 8. a bottom surface of the spark plug hole; 9. a spark plug side electrode; 10. a special screw tap; 11. the screw tap clamps the locating surface; 12. and (4) tapping starting points by a tap.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without any inventive step, are within the scope of the present invention.

Example (b): see fig. 1-6.

As shown in fig. 2-4, a spark plug hole structure for spark plug electrode orientation includes a cylinder head 1, a spark plug hole 2, a spark plug sealing copper pad 3 and a spark plug 4, wherein a cylinder head exhaust passage 5, a cylinder head intake passage 6 and a spark plug hole 2 are arranged on the cylinder head 1, and the spark plug hole 2 is arranged between the cylinder head exhaust passage 5 and the cylinder head intake passage 6;

the spark plug is characterized in that the spark plug sealing copper pad 3 is arranged on the top surface 7 of the spark plug hole, internal threads are arranged on the inner wall from the top surface 7 of the spark plug hole to the bottom surface 8 of the spark plug hole, the spark plug 4 is matched with the internal threads of the spark plug hole 2 through the threads at the bottom of the spark plug 4 and then fixed in the spark plug hole 2, and a spark plug side electrode 9 is arranged at the bottom of the spark plug.

Specifically, as shown in fig. 4, the spark plug 4 in the present embodiment eliminates the conventional sealing spring washer, and performs sealing by using the spark plug copper sealing washer 3 with a small compressive elastic deformation amount after tightening, and the working principle is as follows: after the spark plug 4 is stressed, the threads at the bottom of the spark plug 4 are meshed with the internal threads of the spark plug hole 2, so that pressing force is generated on the spark plug copper sealing pad 3, and the spark plug copper sealing pad 3 is slightly deformed after being stressed, so that the sealing function of the spark plug hole 2 is realized.

The internal threads of the spark plug hole 2 are tapped by a special tap 10, as shown in fig. 5, one end of the special tap 10 is provided with a tap clamping and positioning surface 11, the other end of the special tap 10 is marked with a tap tapping starting point 12, and the tap tapping starting point 12 falls in the plane of the tap clamping and positioning surface 11.

Specifically, in order to realize the orientation function of the spark plug hole 2, in the embodiment, a special screw tap 10 is required to tap the spark plug hole 2, and a screw tap clamping and positioning surface 11 is arranged at one end of the special screw tap 10, so that when the special screw tap 10 is assembled on a tapping machine, the screw tap can be oriented to a specific direction through the positioning surface structure, but the special screw tap is not limited to the positioning surface structure, and similar structures such as a positioning pin and a positioning block which can position the screw tap can also be adopted; the other end of the special tap 10 is provided with a tap tapping starting point 12 in the same direction as the tap clamping and positioning surface 11, so that when the tap is oriented in a specific direction by the positioning surface structure, the position and direction of the tapping starting point are fixed.

As shown in fig. 1 and 5, a method for processing a spark plug hole for orienting a spark plug electrode comprises the following steps:

s1, clamping and assembling one end of a special screw tap 10, which is provided with a screw tap clamping and positioning surface 11, on a tapping machine, and adjusting the tapping angle of the special screw tap 10 to be consistent with the design angle of a spark plug hole 2;

s2, adjusting the distance from a tap tapping starting point 13 marked on the other end of the special tap 10 to the top surface 7 of the spark plug hole, so that the tapping starting point of the special tap 10 on the top surface 7 of the spark plug is consistent with the position of a tap tapping starting point 12 assembled on a tapping machine;

and S3, starting the tapping machine to tap the spark plug hole 2, and withdrawing the special screw tap 10 after the special screw tap 10 taps the designed depth of the spark plug hole 2 to complete the tapping process of the spark plug hole 2.

In this embodiment, in the step S2, the distance from the tap tapping starting point 12 marked on the other end of the special tap 10 to the plug hole top surface 7 is adjusted by the following formula:

in the formula: b, the distance m from the tapping starting point of the special screw tap to the top surface of the spark plug hole;

v-feed speed of the threading machine, m/s;

w-rotational angular velocity, deg/s, of the tapping machine;

n is a positive integer.

Specifically, the distance from the tap tapping starting point 12 to the plug hole top surface 7 is calculated using the formula (1), and the rotation angle of the tap is exactly an integral multiple of 360 ° during the movement of the special tap 10 from the tapping starting point to the plug hole top surface 7, that is, when the special tap 10 is moved to the plug hole top surface 7, the tapping starting point thereof is at the same position as the tapping starting point of the initial position, so as to achieve the purpose of controlling the tap tapping starting point position of the plug hole 2.

In this embodiment, after the special tap 10 is tapped to the designed depth of the spark plug hole 2 in the step S3, the special tap 10 is withdrawn, and the calculation formula of the designed depth is as follows:

C＝m×p (2)

in the formula: c is the design depth from the top surface of the spark plug to the bottom surface of the spark plug, m;

p is the thread pitch m of the internal thread processed by the special screw tap;

m is a positive integer.

Specifically, the tapping depth of the spark plug hole 2 is designed to be an integral multiple of the pitch P of the internal thread machined by the special tap 10 by using the formula (2) so as to achieve the purpose of controlling the tapping end position of the spark plug hole 2.

In summary, the principle and assembly process of a spark plug hole for spark plug electrode orientation of the present invention is:

the angle between the spark plug side electrode 9 and the starting point of the screw thread of the spark plug 4 is adjusted through a tool, then the spark plug 4 is installed in the spark plug hole 2, and the direction of the starting point and the ending point of the screw thread of the spark plug hole 2 and the angle between the starting point of the screw thread of the spark plug side electrode 9 and the starting point of the screw thread of the spark plug 4 are controllable, so that the direction of the spark plug side electrode 9 on a cylinder cover 1 can be also controlled after the spark plug 4 is installed, and therefore the directional installation of the spark plug side electrode 9 is achieved, the phenomenon that the spark plug side electrode interferes with air intake tumble distribution and oil jet in a cylinder is avoided, furthermore, the ignition delay angle is effectively shortened through the matching design of the installation position of the spark plug side electrode 9, the shape of a combustion chamber, the air intake tumble distribution and the oil jet, the combustion and the discharge in the cylinder are improved, and the utilization rate of fuel is improved.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.