JP2012167624A - Device and method for assembling engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device and method for assembling an engine, by which an existing ignition plug can be installed to a cylinder head without changing the existing ignition plug so that an outer electrode is positioned at an optimum mounting angle for ignition.SOLUTION: When a master plug 12 is fastened to a plug mounting hole 101 formed in the cylinder head 100, a cylinder head grade setting means 10 discriminates the cylinder head 100 according to the mounting turning angle position of the master plug 12. Meanwhile, an ignition plug grade setting means 30 discriminates the ignition plug 110 according to the direction 118a of the outer electrode 118 with a mounting screw portion 117 for the ignition plug 110 fastened to a mounting hole 32 formed in a master head 31, and the ignition plug 110 with a grade discriminated corresponding to the cylinder head 100 is fastened.

Description

  The present invention relates to an engine assembling apparatus and an engine assembling method, and in particular, an engine assembling apparatus for screwing a spark plug having a center electrode and an outer electrode into a plug mounting hole of a cylinder head so that each electrode is exposed in a combustion chamber, and The present invention relates to an engine assembly method.

  As shown in FIG. 7, an ignition plug used for ignition of an internal combustion engine, for example, an in-vehicle engine, is mounted with a terminal 112, an insulator 113, a center electrode 114, a hexagonal portion 116, and a mounting screw portion 117. An outer electrode 118 having a plug main body 111 constituted by a metal fitting 115 or the like and forming an ignition gap g between the mounting metal fitting 115 and the central electrode 114 is provided.

  The spark plug 110 configured as described above is attached by inserting the gasket 120 between the mounting bracket 115 and the cylinder head 100 and screwing the mounting screw portion 117 into the plug mounting hole 101 of the cylinder head 100. The central electrode 114 and the outer electrode 118 are exposed in the combustion chamber 105. The fuel in the combustion chamber 105 is ignited by spark discharge in the ignition gap g formed by the central electrode 114 and the outer electrode 118 exposed in the combustion chamber 105.

  The spark plug 110 is required to have good ignitability for the purpose of purifying the exhaust gas of the engine and reducing fuel consumption. In particular, in recent years, high-performance ignitability for lean fuel is required. The lean fuel has a low fuel mixture ratio, and depending on the direction of the outer electrode 118 of the spark plug 110 in the combustion chamber 105, that is, depending on the mounting angle of the spark plug 110, the fuel introduction is blocked by the outer electrode 118, resulting in poor ignition. Therefore, the ignitability can be improved by adjusting the mounting angle position of the spark plug 110 so that the outer electrode 118 is orthogonal to the fuel flow direction, for example, the direction from the intake valve side to the exhaust valve side. It is known to improve.

  For this reason, it is preferable to set the mounting angle position after the tightening of the mounting screw portion 117 to the plug mounting hole 101 is finished so that the outer electrode 108 of the spark plug 110 is in an optimum direction for ignition.

  However, due to a problem in manufacturing efficiency of the cylinder block 100, there is a variation in the position of the screw thread start end of the mounting hole 101, and the positional relationship between the screw thread start end and the outer electrode 108 is usually not constant. When the mounting screw portion 117 is tightened in the plug mounting hole 101 until a predetermined tightening torque that can ensure airtightness by the gasket 120 is reached, the outer electrode 118 is not necessarily in the optimum direction and may be greatly displaced. . In addition, in the spark plug 110, the positional relationship between the screw thread start end of the mounting screw portion 117 and the outer electrode 118 also varies.

  Therefore, there have been proposed various measures for attaching an ignition plug so that when the ignition plug is attached to the plug attachment hole of the cylinder head, the outer electrode is oriented optimally for ignition.

  For example, Patent Document 1 discloses that a spark plug mounting bracket having an identification portion on the plug body that allows the orientation of the outer electrode to be identified from the outside is screwed into a plug mounting hole of a cylinder head to be tightened. After confirming the direction of the gas by the identification part, remove the spark plug and attach a gasket selected from two or more thicknesses so that the direction of the outer electrode is constant with respect to the fuel flow direction in the combustion chamber. A method for attaching a spark plug is disclosed in which the spark plug is fitted to a threaded portion and tightened again in a plug mounting hole of a cylinder head.

  Further, in Patent Document 2, a spark plug mounting bracket is provided with a cylindrical portion and a body portion having no mounting screw portion that can be inserted into a plug mounting hole of a cylinder head, and a rotation preventing means for the cylinder head is provided in the cylindrical portion. In addition, a spark plug is disclosed in which the outer electrode can be oriented in a preset direction by being attached to the cylinder head by a fixing member separate from the mounting bracket.

  In Patent Document 3, the outer electrode and the plug body are formed separately, and the outer electrode is disposed in the combustion chamber in a direction orthogonal to the direction from the intake valve side to the exhaust valve side in the combustion chamber. Is disclosed regardless of the mounting angle position around the axis of the plug body.

  In Patent Document 4, the gasket disposed on the mounting screw portion of the spark plug is configured so that it can be compressed and deformed in a state where an appropriate tightening force is maintained, so that ignition is performed while maintaining an appropriate tightening force. A gasket is disclosed in which the plug can be rotated relatively large and the orientation of the outer electrode can be easily adjusted.

JP-A-6-325853 JP-A-10-64656 JP 2000-357578 A Japanese Patent Laid-Open No. 11-351393

  According to Patent Document 1, after the ignition plug is tightened in the plug mounting hole of the cylinder head and the orientation of the outer electrode with respect to the cylinder head is confirmed by the identification unit, the ignition plug is temporarily removed and the orientation of the outer electrode is the fuel flow in the combustion chamber. The direction of the outer electrode of the spark plug can be optimally set by selecting a gasket having a thickness that is constant with respect to the direction and attaching the spark plug to the cylinder head again.

  However, after tightening the spark plug mounting bracket into the cylinder head plug mounting hole and confirming the orientation of the outer electrode with the identification part, remove the spark plug and select a gasket with a thickness that makes the orientation of the outer electrode constant. Since the spark plug is attached to the plug mounting hole of the cylinder head again, the mounting work of the spark plug is troublesome and the work cost increases, and various thicknesses of gaskets are required, resulting in an increase in the number of components. There is concern over the rise in parts costs and parts management costs.

  According to Patent Document 2, the direction of the outer electrode can be set in a predetermined position by attaching the spark plug to the cylinder head by a fixing member separate from the mounting bracket.

  However, since the spark plug mounting bracket is positioned and mounted in the cylinder head plug mounting hole with a stopper, and the spark plug is mounted on the cylinder head by a separate fixing member, the mounting work of the spark plug is cumbersome and the work cost is low. In addition, the spark plug and the cylinder head have a complicated structure due to the fact that the spark plug is provided with a non-rotating means, which is not versatile with the conventional spark plug, and a fixing member is required, and the number of components is reduced. Increased parts costs and parts management costs increase.

  According to Patent Document 3, the outer electrode and the plug body are formed separately, and the outer electrode is disposed in the combustion chamber inside in a direction orthogonal to the direction from the intake valve side to the exhaust valve side in the combustion chamber. The direction of the outer electrode can be set regardless of the mounting angle position around the axis of the plug body.

  However, since the outer electrode is attached to the cylinder head separately from the plug body, the installation of the spark plug is cumbersome and the operation cost is increased, and the configuration of the spark plug and the cylinder head is complicated and the existing spark plug is not compatible with the existing spark plug. There is no versatility, and the spark plug main body and the outer electrode are separated, and the number of components increases, which may raise the cost of components and component management.

  According to Patent Document 4, the gasket disposed on the mounting screw portion of the spark plug is configured such that it can be compressed and deformed in a state where a moderate tightening force is maintained, so that a moderate tightening force is maintained. The spark plug can be rotated relatively large, and the direction of the outer electrode can be adjusted.

  However, it is necessary to make it possible to compressively deform the gasket within the proper pressure range for tightening the mounting screw part, which requires a gasket whose characteristics are significantly different from those of conventional gaskets. It is required to ensure the reliability.

  Accordingly, an object of the present invention made in view of such a point is to maintain the versatility of the existing spark plug without increasing the number of components and the cost of the parts, and to set the spark plug in an optimal state of the outer electrode. An engine assembly apparatus and an engine assembly method that can be attached to a cylinder head.

  The invention of the engine assembly apparatus according to claim 1, which achieves the above object, is characterized in that a spark plug having a center electrode and an outer electrode is attached to the plug mounting hole of the cylinder head so that each electrode is exposed in the combustion chamber. In an engine assembly apparatus in which a screw portion is screwed and fastened, a cylinder head grade setting means for identifying a cylinder head according to a mounting rotation angle position in tightening and fastening a spark plug mounting screw portion to a cylinder head plug mounting hole, and a spark plug Spark plug grade setting means for identifying the spark plug according to the position of the outer electrode in tightening and fastening the mounting screw portion to the cylinder head plug mounting hole, and the cylinder in the plug mounting hole includes the cylinder in the plug mounting hole. Use the grade setting means to install the spark plug mounting screw into the plug mounting hole. A spark plug having a predetermined relationship between a mounting rotation angle by fastening fastening and a relationship between an outer electrode by fastening fastening of a spark plug mounting screw portion by the spark plug grade setting means is selectively assembled. .

  According to this, in the cylinder head grade setting means, the cylinder head is identified by the mounting rotation angle position of the spark plug in tightening and fastening the spark plug mounting screw to the cylinder head plug mounting hole, while in the spark plug grade setting means The ignition plug is identified in accordance with the position of the outer electrode in a state where it is tightened and fastened to the cylinder head plug mounting hole of the ignition plug mounting screw portion, and the identified ignition plug of the ignition plug corresponding to the identified cylinder head plug mounting hole is identified. The direction of the outer electrode can be set within a predetermined range by tightening and fastening the mounting screw portion. As a result, the outer electrode can be attached to the cylinder head so as to be at the optimum mounting angle position without changing the existing spark plug without causing an increase in the number of components or an increase in component costs.

  The invention of the engine assembly apparatus according to claim 2 which achieves the above object is characterized in that a spark plug having a center electrode and an outer electrode is attached to the plug mounting hole of the cylinder head so that each electrode is exposed in the combustion chamber. Cylinder head grade setting means for identifying a cylinder head in accordance with a rotation angle position in tightening and fastening a mounting screw portion of a spark plug to a plug mounting hole of a cylinder head in an engine assembly apparatus for screwing and fastening a screw portion, and the cylinder head Cylinder head classifying means for classifying the cylinder head identified by the grade setting means into a plurality of grades, and identifying the spark plug according to the position of the outer electrode in fastening fastening of the mounting screw portion of the spark plug to the cylinder head plug mounting hole Spark plug grade setting means and the spark plug grade Cylinder head sorting means for classifying the spark plugs identified by the fixing means into a plurality of grades, and for each spark plug classified into a plurality of grades, a cylinder of one of the grades divided into a plurality of grades The heads are made to correspond to each other so that the direction of the outer electrode in the combustion chamber is in a predetermined range when the ignition plug is assembled.

  According to this, in the cylinder head grade setting means, the cylinder head is identified according to the mounting rotation angle position in tightening and fastening the mounting screw portion of the spark plug to the plug mounting hole of the cylinder head, and each identified cylinder head is identified as the cylinder head. The spark plug grade setting means identifies the spark plug according to the position of the outer electrode in the fastening fastening to the plug mounting hole of the cylinder head in the spark plug grade setting means. Spark plugs are classified into multiple grades by means of spark plug grade classification, and each of the spark plugs classified into multiple grades is ignited by associating one of the graded cylinder heads. By assembling the plug The orientation of the side electrode can be set to a predetermined range. As a result, the outer electrode can be attached to the cylinder head so as to be in the optimum mounting angle position without changing the existing spark plug without causing an increase in the number of components and the cost of parts.

  According to a third aspect of the present invention, in the engine assembling apparatus according to the first or second aspect, the cylinder head grade setting means has a cylinder head according to a mounting rotation angle position by tightening and tightening a screw portion of a master plug into a plug mounting hole of the cylinder head. It is characterized by identifying.

  A third aspect of the present invention is a specific configuration of the cylinder head grade setting means, and the cylinder head can be identified in accordance with the mounting rotation angle position by tightening and tightening the screw portion of the master plug to the plug mounting hole of the cylinder head.

  A fourth aspect of the present invention is a specific configuration of the cylinder head grade setting means, and the cylinder head can be identified according to the thread end position of the plug mounting hole of the cylinder head.

  According to a fifth aspect of the present invention, in the engine assembling apparatus according to any one of the first to fourth aspects, the spark plug grade setting means is formed by tightening a mounting screw portion of a spark plug into a mounting hole of a master head. The spark plug is identified according to the position of the outer electrode.

  The fifth aspect of the present invention is a specific configuration of the spark plug grade setting means, and the spark plug can be identified according to the position of the outer electrode by tightening and tightening the mounting screw portion of the spark plug to the mounting hole of the master head.

  In the engine assembly method of claim 6, the spark plug having the center electrode and the outer electrode is screwed into the plug mounting hole of the cylinder head so that each electrode is exposed in the combustion chamber. In the engine assembling method to be fastened, the cylinder head is identified according to the mounting rotational angle position in the fastening fastening of the spark plug mounting screw portion to the cylinder head plug mounting hole, and the ignition plug mounting screw portion to the cylinder head plug mounting hole The ignition plug is identified according to the position of the outer electrode in the tightening and fastening, and the rotation angle of the cylinder head by attaching and fastening the spark plug mounting screw portion to the spark plug mounting hole in the plug mounting hole is The relationship with the outer electrode by tightening and fastening the mounting screw portion of the spark plug has a predetermined relationship Wherein the assembly of the spark plug selectively.

  According to this, the cylinder head is identified according to the mounting rotational angle position in tightening and fastening the spark plug mounting screw portion into the cylinder head plug mounting hole, and the ignition plug mounting screw portion is tightened into the cylinder head plug mounting hole. The ignition plug is identified according to the position of the outer electrode in fastening, and the mounting rotation angle by fastening fastening of the ignition plug mounting screw portion to the ignition plug mounting hole in the plug mounting hole in the plug mounting hole of the cylinder head and the ignition A spark plug having a predetermined relationship with the outer electrode by tightening and tightening the mounting screw portion of the plug can be selectively assembled.

  According to the seventh aspect of the invention of the engine assembly method, a spark plug having a center electrode and an outer electrode is screwed into a plug mounting hole of a cylinder head so that each electrode is exposed in the combustion chamber. In the engine assembly method to be fastened, the cylinder head is identified according to the mounting rotation angle position in the tightening fastening of the spark plug mounting screw portion to the plug mounting hole of the cylinder head, and the cylinder head is divided into the plurality of identified grades. The spark plug is identified according to the position of the outer electrode in the fastening fastening of the mounting portion of the spark plug to the cylinder head plug mounting hole, and the spark plug is divided into a plurality of identified grades. For each spark plug, use one of the grades divided into cylinders. Made to correspond to de, orientation of the outer electrode in the combustion chamber in the assembled state of the spark plug is characterized in that the combining to a predetermined range.

  According to this, the cylinder head is identified according to the mounting rotation angle position in tightening and fastening the spark plug mounting screw portion to the plug mounting hole of the cylinder head, and the cylinder head is divided into the plurality of identified grades. The ignition plug is identified according to the position of the outer electrode in the fastening fastening of the mounting screw portion of the cylinder head to the plug mounting hole of the cylinder head, and the ignition plug is divided into a plurality of identified grades, and each ignition divided into the plurality of grades A cylinder head of one of the grades divided into a plurality of grades can be made to correspond to the plug, and can be combined so that the direction of the outer electrode in the combustion chamber is within a predetermined range when the ignition plug is assembled.

  The invention according to claim 8 is the engine assembly method according to claim 7 or 8, wherein the hexagonal portion of the spark plug is provided with an outer electrode position indication corresponding to the position of the outer electrode.

  According to this, by indicating the outer electrode position corresponding to the position of the outer electrode on the hexagonal portion of the spark plug, the state of the outer electrode in the combustion chamber can be confirmed with the spark plug mounted on the cylinder head.

  According to the present invention, the cylinder head is identified according to the mounting rotation angle position in tightening and fastening the spark plug mounting screw portion to the cylinder head plug mounting hole, while the spark plug mounting screw portion is connected to the cylinder head plug mounting hole. The direction of the outer electrode can be set within a predetermined range by identifying the ignition plug according to the position of the outer electrode in the tightening and fastening the fastening screw portion of the identified ignition plug.

It is a functional block diagram which shows schematic structure of the engine assembly apparatus of embodiment of this invention. It is explanatory drawing which shows the outline of a spark plug, (a) is a side view of a spark plug, (b) is an arrow view of (a). It is a schematic explanatory drawing of a cylinder head grade setting means. It is grade explanatory drawing of a cylinder head. It is a schematic explanatory drawing of a spark plug grade setting means. It is grade explanatory drawing of a spark plug. It is sectional drawing which shows the outline | summary of the ignition plug with which the cylinder head of the engine was mounted | worn.

  Hereinafter, an embodiment of an engine assembly apparatus and an engine assembly method according to the present invention will be described with reference to FIGS. In addition, the structure of the cylinder head in this Embodiment and the spark plug attached to a cylinder head is the structure similar to the cylinder head 100 and the spark plug 110 shown in the said FIG. 7, and attaches | subjects the same code | symbol to a corresponding site | part.

  1 is a functional block diagram showing a schematic configuration of an engine assembly apparatus according to the present embodiment, FIG. 2 is a schematic explanatory diagram of a spark plug, FIG. 3 is a schematic explanatory diagram of cylinder head grade setting means, and FIG. 4 is a cylinder head grade. FIG. 5 is a schematic explanatory view of the spark plug grade setting means, and FIG. 6 is an explanatory view of the spark plug grade.

  In the present embodiment, as shown in FIG. 1, cylinder head grade setting means 10, cylinder head grade setting means 10 for identifying the cylinder head 100 into a plurality of grades according to plug mounting holes 101 formed in the cylinder head 100. Cylinder head sorting means 20 for classifying cylinder head 100 into a plurality of grades based on the grade identification by means of spark plug, spark plug grade setting means 30 for discriminating spark plugs into a plurality of grades according to the mounting angle of outer electrode 118, spark plug grade There are ignition plug classifying means 40 for classifying the spark plug 110 into a plurality of grades based on the grade identification by the setting means 30, and spark plug mounting means 50 for assembling the corresponding grade spark plug 110 to the cylinder head 100.

  2A and 2B are schematic explanatory views of the spark plug 110, in which FIG. 2A is a side view of the spark plug 110, and FIG. 2B is an arrow view in FIG. As shown in FIG. 2, the spark plug 110 has a plug body 111 constituted by a mounting bracket 115 formed with a terminal 112, an insulator 113, a center electrode 114, a hexagonal portion 116, and a mounting screw portion 117. An outer electrode 118 that forms an ignition gap g between the metal fitting 115 and the central electrode 114 is provided. Further, an outer electrode position display 119 by notching or coloring indicating the position of the outer electrode 118 is attached to the hexagonal portion 116 corresponding to the position of the outer electrode 118. Reference numeral 120 denotes a gasket attached to the mounting screw portion 117 of the mounting bracket 115 of the spark plug 110. The gasket 120 is preferably one whose accuracy is controlled by a copper gasket or the like that is relatively less deformed with respect to the tightening pressure.

  The cylinder head grade setting means 10 will be described with reference to FIG. The cylinder head grade setting means 10 includes a rotation driving means 11 having a torque setting means, a rotation driving means 11 that is rotationally driven by the rotation driving means 11, and an attachment screw portion 117 of the spark plug 110 that can be screwed into the plug attachment hole 101 of the cylinder 100. A shaft-shaped master plug 12 having a corresponding screw portion 13 and a contact portion 14 capable of contacting the cylinder 100, a rotational position sensor 16 for detecting the rotational position of the master plug 12, and a plug mounting hole coaxially with the master plug 12. A cylinder head support portion (not shown) for setting the cylinder head 100 by aligning the position of the cylinder 101 and the cylinder grade detection means 17 are provided. The cylinder head grade detection means 17 is a master plug by the preset grade setting data and the rotational position sensor 16. Cylinder head based on 12 rotational position detection 00 to identify the grade of.

  The grade setting data of the cylinder head grade detecting means 17 will be described. The screw thread start end formed in the plug mounting hole 101 of the cylinder head 100 varies in the cylinder head 100, and the mounting screw portion 117 of the spark plug 110 is connected to the cylinder with a predetermined tightening torque preset in the plug mounting hole 101. Similarly, when the direction of the outer electrode 108 of the spark plug 110 is different when tightened in the plug mounting hole 101 of the head 100, the master plug 12 corresponds to a tightening torque for tightening the spark plug 110 in the plug mounting hole 101 of the cylinder head 100. When tightened with a tightening torque, the rotation angle of the master plug 12, that is, the mounting angle position differs from the spark plug 110.

  Therefore, a plurality of grades are identified according to the mounting rotation angle position of the master plug 12 when the master plug 12 is tightened in the plug mounting hole 101 of the cylinder head 100 with a predetermined tightening torque. In the present embodiment, as shown in FIG. 4, an outer electrode reference 15 that extends corresponding to the outer electrode 118 of the spark plug 110 is set in the master plug 12. On the other hand, the rotation direction of the master plug 12 with the position perpendicular to the combustion flow direction f in the combustion chamber 105 in the cylinder head 100 set and held on the cylinder head support portion around the rotation center axis of the master plug 12 as the evaluation reference position a. r is divided into six types of grades A, B, and C to F in order at intervals of a rotation angle of 30 °.

  In the cylinder head setting means 10, a master plug 12 that is rotated by the rotation driving means 11 is screwed into the plug mounting hole 101 of the cylinder head 100 set in the cylinder head support portion and tightened in advance until a predetermined torque is reached. The rotational position sensor 16 detects the mounting rotational angle position of the master plug 12 when the predetermined torque is reached.

  Following the detection of the attachment rotation angle position of the master plug 12 by the rotation position sensor 16, the grade of the cylinder head 100 is identified by comparing the attachment rotation angle position of the master plug 12 detected by the rotation position sensor 16 and the grade setting data. For example, the direction 15a of the outer electrode reference 15 at the turning angle position of the master plug 12 detected by the rotation position sensor 16 is graded in the range of 0 ° to 30 ° in the rotation direction of the master plug 12 with respect to the evaluation reference position a. A, the range from 30 ° to 60 ° is Grade B, the range from 60 ° to 90 ° is Grade C, the range from 90 ° to 120 ° is Grade D, the range from 120 ° to 150 ° Then, grade E is identified as grade F in the range of over 150 ° to 180 °.

  In the cylinder head classification means 20, each cylinder head 100 is classified into grades A and B to F according to the identification by the cylinder head grade setting means 10, and a two-dimensional bar code or the like is assigned to each cylinder head 100 according to each grade as necessary. Attach identification means.

  The spark plug grade setting means 30 will be described with reference to FIG. The spark plug grade setting means 30 includes a plate-like master head 31 in which a mounting hole 32 into which a mounting screw portion 117 of the spark plug 110 can be screwed in the same manner as the plug mounting hole 101 of the cylinder head 100, Spark plug rotation drive means 33 having torque setting means, which is arranged above and screwed into the mounting hole 32 of the master head 31 from above and tightened, is disposed below the master head 31. In addition, an outer electrode detecting means 34 such as a CCD camera and an ignition plug grade detecting means 36 for detecting the direction 118a of the outer electrode 118 of the spark plug 110 that is screwed into the mounting hole 32 are provided. The spark plug grade detection means 36 identifies the grade of the spark plug 110 based on the preset grade setting data and the detection of the direction of the outer electrode 118 by the outer electrode detection means 34.

  The grade setting data of the spark plug grade detecting means 36 will be described. In each spark plug 110, the screw thread start end of the mounting portion 117, the position of the outer electrode 117, and the like vary, and the plug mounting hole 101 of the same cylinder head 100 is tightened with a predetermined tightening torque via a gasket 120. At this time, the direction of the outer electrode 118 of the spark plug 110 varies.

  Therefore, a plurality of grades are identified according to the orientation 118a of the outer electrode 118 when the ignition plug 110 is tightened with a predetermined tightening torque with the gasket 120 interposed in the mounting hole 32 of the master head 31. In this embodiment, as shown in FIG. 6, the mounting angle of the outer electrode 118 of the spark plug 110 is ignited with the position perpendicular to the combustion flow direction f centered on the rotation center of the spark plug 110 as the evaluation reference position a. The plug 110 is divided into six grades A, B, and C to F at intervals of a rotation angle of 30 ° in the reverse rotation direction -r of the plug 110.

  The spark plug grade setting means 30 is prepared by mounting the gasket 120 on the mounting screw portion 117 of the spark plug 110. Next, the mounting screw portion 117 of the spark plug 110 rotated by the rotation driving means 33 is screwed into the mounting hole 32 of the master head 31 and tightened until a predetermined torque is reached.

  The direction 118a of the outer electrode 118 of the spark plug 110 when the predetermined tightening torque is reached is detected by the outer electrode detecting means 34.

  Following the detection of the outer electrode 118 by the outer electrode detection means 34, the ignition plug grade detection means 36 compares the direction 118a of the outer electrode 118 detected by the outer electrode detection means 34 and the grade setting data to determine the grade of the spark plug 110. Set. For example, if the direction 118a of the outer electrode 118 detected by the outer electrode detector 34 is in the range of 0 ° to 30 ° in the reverse rotation direction −r with respect to the tightening rotation direction of the spark plug 100 with respect to the evaluation reference position a, grade A, Grade B in the range from 30 ° to 60 °, Grade C in the range from 60 ° to 90 °, Grade D in the range from 90 ° to 120 °, Grade in the range from 120 ° to 150 ° E, grade F is identified in the range from 150 ° to 180 °.

  In the spark plug grade classification means 40, each spark plug 110 is classified into each grade A, B to F in the spark plug grade classification means 40 according to the identification by the spark plug grade setting means 30, and each spark plug 110 is assigned to each spark plug 110 as necessary. Depending on the grade, identification means is attached with a two-dimensional barcode or the like.

  In the spark plug mounting means 50, the cylinder head 100 of the corresponding grade classified for each grade in the cylinder head grade classification means 20 and the spark plug 110 of the corresponding grade classified for each grade in the spark plug grade classification means 40. And the spark plug 110 is assembled to the corresponding cylinder head 100 of the same grade. For example, a grade A spark plug 110 is assembled to a grade A cylinder head 100.

  When the master plug 12 is tightened in the plug mounting hole 101 of the grade A cylinder head 100 with a predetermined tightening torque, the direction 15a of the outer electrode reference 15 is tightened with respect to the evaluation reference position a perpendicular to the fuel flow direction f. r is set in the range of 0 ° to 30 °. On the other hand, when the spark plug 100 is tightened to the mounting hole 32 of the master head 31 with a predetermined tightening torque through the gasket 120, the direction 118a of the outer electrode 118 is set. Is set in the range of 0 ° to 30 ° in the reverse rotation direction −r with respect to the tightening direction with respect to the evaluation reference position a orthogonal to the fuel flow direction f. Therefore, in the plug mounting hole 101 of the grade A cylinder head 100. A spark plug 11 is formed by tightening a grade A spark plug 110 with a predetermined tightening torque through a gasket 200. The direction of tightening rotation is controlled so that the direction 118a of the outer electrode 118 is adjusted to the direction of the evaluation reference position a orthogonal to the fuel flow direction f, and adjusted to a predetermined range of direction orthogonal to the fuel flow direction f. it can.

  Similarly, by attaching the spark plugs 110 of grades B to F corresponding to the cylinder heads 100 of the grades B to F with a predetermined tightening torque, the direction 118a of the outer electrode 118 of the spark plug 110, that is, the mounting angle position is set. It can be adjusted in a predetermined range perpendicular to the fuel flow direction.

  As described above, in this embodiment, the master plug 13 is attached to the plug mounting hole 101 of the cylinder head 100 with a predetermined torque, and the cylinder head 100 is divided into a plurality of grades based on the rotational position of the master plug 13 with respect to the evaluation reference position a. The spark plug 110 is attached to the mounting hole 32 of the master head 31 with a predetermined torque, and the spark plug 110 is classified into a plurality of grades according to the position of the outer electrode 108 with respect to the evaluation reference position a. By attaching the spark plug 110 to the cylinder head 100, the mounting angle of the outer electrode 118 with respect to the cylinder head 100 can be set to a preset position. As a result, the outer electrode 118 can be attached to the cylinder head 100 so as to be at the optimum attachment angle position without changing the existing spark plug 110 without causing an increase in the number of components and the cost of parts.

  Further, since the outer electrode position indication 119 is attached to the hexagonal portion 116 of the spark plug 110, the position of the outer electrode 118 can be visually confirmed with the spark plug 110 attached to the cylinder head 100.

  Note that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the invention. For example, in the above embodiment, the master plug 12 is tightened to the plug mounting hole 101 of the cylinder head 100 with a predetermined torque, and the grade of the cylinder head 100 is identified based on the mounting rotation angle position of the master plug 12. The cylinder head 100 can be graded by detecting the screw thread end position of the plug mounting hole 101 by a non-contact method. In the above embodiment, the cylinder head 100 and the spark plug 110 are classified into six grades A to F, but can be classified into other multiple grades.

DESCRIPTION OF SYMBOLS 10 Cylinder head grade setting means 12 Master plug 16 Rotation position sensor 17 Cylinder grade detection means 20 Cylinder head division means 30 Spark plug grade setting means 31 Master head 32 Mounting hole 33 Spark plug rotation drive means 34 Outer electrode detection means 36 Spark plug grade Detection means 40 Spark plug sorting means 50 Spark plug mounting means 100 Cylinder head 101 Plug mounting hole 105 Combustion chamber 110 Spark plug 114 Central electrode 115 Mounting bracket 116 Hexagonal portion 117 Mounting screw portion 118 Outer electrode 118a Outer electrode direction 119 Outer electrode position Indication 120 Gasket

Claims (8)

In an engine assembly apparatus in which an ignition plug including a center electrode and an outer electrode is screwed and fastened to a plug mounting hole of a cylinder head so that each electrode is exposed in the combustion chamber.
Cylinder head grade setting means for identifying the cylinder head according to the mounting rotation angle position in tightening fastening of the spark plug mounting screw to the plug mounting hole of the cylinder head;
A spark plug grade setting means for identifying the spark plug according to the position of the outer electrode in tightening fastening of the mounting screw portion of the spark plug to the plug mounting hole of the cylinder head;
In the plug mounting hole of the cylinder head, the mounting rotation angle of the plug mounting hole by tightening the fastening screw portion of the spark plug to the plug mounting hole by the cylinder grade setting means and the mounting of the spark plug by the spark plug grade setting means An engine assembly device, wherein a spark plug having a predetermined relationship with a relationship with an outer electrode by tightening and tightening a screw portion is selectively assembled. In an engine assembly apparatus in which an ignition plug including a center electrode and an outer electrode is screwed and fastened to a plug mounting hole of a cylinder head so that each electrode is exposed in the combustion chamber.
Cylinder head grade setting means for identifying the cylinder head according to the mounting rotation angle position in tightening fastening of the spark plug mounting screw to the plug mounting hole of the cylinder head;
Cylinder head classifying means for classifying the cylinder head identified by the cylinder head grade setting means into a plurality of grades;
Spark plug grade setting means for identifying the spark plug according to the position of the outer electrode in tightening and fastening the spark plug mounting screw to the cylinder head plug mounting hole;
Cylinder head sorting means for classifying the spark plug identified by the spark plug grade setting means into a plurality of grades,
For each spark plug divided into multiple grades, one cylinder head of one of the multiple grades is made to correspond, and the direction of the outer electrode in the combustion chamber is within a predetermined range when the spark plug is assembled. An engine assembling apparatus characterized by combining in such a manner. The cylinder head grade setting means includes:
The engine assembly apparatus according to claim 1 or 2, wherein the cylinder head is identified in accordance with a mounting rotation angle position by tightening and tightening a screw portion of the master plug into the plug mounting hole of the cylinder head. The cylinder head grade setting means includes:
The engine assembly apparatus according to claim 1, wherein the cylinder head is identified according to a thread end position of a plug mounting hole of the cylinder head. The spark plug grade setting means includes:
The engine assembly device according to any one of claims 1 to 4, wherein the ignition plug is identified according to the position of the outer electrode by fastening and fastening the mounting screw portion of the spark plug to the mounting hole of the master head. In an engine assembly method, in which an ignition plug having a center electrode and an outer electrode is screwed and fastened to a plug mounting hole of a cylinder head so that each electrode is exposed in the combustion chamber.
Identifies the cylinder head according to the mounting rotation angle position in tightening and fastening the spark plug mounting screw to the cylinder head plug mounting hole,
Identify the spark plug according to the position of the outer electrode in the tightening fastening of the mounting screw portion of the spark plug to the plug mounting hole of the cylinder head,
In the plug mounting hole of the cylinder head, the mounting rotation angle of the plug mounting hole by tightening and tightening the mounting screw portion of the spark plug to the spark plug mounting hole and the outer electrode by tightening and tightening of the mounting screw portion of the spark plug An engine assembly method comprising selectively assembling a spark plug having a predetermined relationship. In an engine assembly method, in which an ignition plug having a center electrode and an outer electrode is screwed and fastened to a plug mounting hole of a cylinder head so that each electrode is exposed in the combustion chamber.
Identifying the cylinder head according to the mounting rotation angle position in tightening and fastening the spark plug mounting screw to the plug mounting hole of the cylinder head and classifying the cylinder head into the plurality of identified grades;
Identifying the spark plug according to the position of the outer electrode in fastening fastening of the mounting screw portion of the spark plug to the plug mounting hole of the cylinder head, and classifying the spark plug into the plurality of identified grades;
For each spark plug divided into multiple grades, one cylinder head of one of the multiple grades is made to correspond, and the direction of the outer electrode in the combustion chamber is within a predetermined range when the spark plug is assembled. An engine assembling method characterized by combining them as follows.   The engine assembly method according to claim 7 or 8, wherein an outer electrode position indication is attached to a hexagonal portion of the spark plug corresponding to the position of the outer electrode.

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