KR20200025798A - Air gauge, measuring equipment and measuring method with the same - Google Patents

Abstract

The present invention relates to an air gauge, a measuring device and a measuring method comprising the same. According to one embodiment of the present invention, an air gauge for measuring the machining precision of multi-journals each having a plurality of bores arranged to receive a crankshaft or a camshaft, the gauge shaft being inserted into the journal under measurement of the multi-journals. ; And a fixing part fastened to the gauge shaft and inserted into an adjacent journal adjacent to the to-be-measured journal of the multi-journals to fix the gauge shaft, wherein the gauge shaft is configured to deliver measurement air therein. There is provided an air gauge having an air flow path and at least one air nozzle connected to the air flow path for injecting the measurement air and corresponding to the plurality of bores.

Description

AIR GAUGE, MEASUREMENT METHOD AND METHOD METHOD CONTAINING THE SAME {AIR GAUGE, MEASURING EQUIPMENT AND MEASURING METHOD WITH THE SAME}

TECHNICAL FIELD The present invention relates to a technique for measuring precision of machining of parts of an internal combustion engine, and more particularly, to an air gauge, a measuring apparatus and a measuring method including the same.

The internal combustion engine may comprise a crank shaft and a cam shaft. The cam shaft is connected to the crankshaft and the timing belt, and may open or close the exhaust valve or the intake valve according to the cam driving. The bore into which the cam shaft and the crank shaft are inserted are generally machined into a circular shape, but if the circular shape is not high precision, the cam shaft and the crank shaft may have problems in driving. Therefore, it is necessary to measure the roundness of the bores to prevent the failure of the internal combustion engine.

In addition, in order to assemble the crank shaft or the cam shaft to the cylinder head of the internal combustion engine, the plurality of bores into which the crank shaft or the cam shaft is inserted are required to be arranged on the same straight line. Therefore, it is required to measure the concentricity of these bores.

Conventionally, a method of measuring concentricity of the bores of the cam shaft or the crankshaft includes a 3D measuring method, an inner diameter measuring device, and a grade bar. The 3D measurement method can accurately measure the inner diameter, roundness, and concentricity of the plurality of bores, but the 3D measurement equipment is expensive and may cause problems that cannot be immediately used in the field. In addition, the inner diameter measuring device and the method of using the grade bar may measure whether the grade bar passes through the plurality of bores without catching the plurality of bores while measuring the inner diameter of the plurality of bores by using a contact inner diameter measuring device. However, a problem may occur in that the reliability of the test is deteriorated.

The technical problem to be solved by the present invention is to provide an air gauge for reliably measuring the processing accuracy, such as the roundness and concentricity of the plurality of bores in which the crank shaft or cam shaft of the internal combustion engine is inserted.

In addition, another technical problem to be solved by the present invention is to provide a measuring device for reliably measuring the processing accuracy, such as the roundness and concentricity of the plurality of bores in which the crank shaft or cam shaft of the internal combustion engine is inserted.

In addition, another technical problem to be solved by the present invention is to provide a measuring method for reliably measuring the processing accuracy, such as roundness and concentricity of a plurality of bores in which the crank shaft or cam shaft of the internal combustion engine is inserted.

An air gauge according to an embodiment of the present invention is an air gauge for measuring processing accuracy of multi journals each having a plurality of bores arranged to receive a crank shaft or a cam shaft, which is inserted into the journal under measurement of the multi journals. Gauge shaft; And a fixing part fastened to the gauge shaft and inserted into an adjacent journal adjacent to the to-be-measured journal of the multi-journals to fix the gauge shaft, wherein the gauge shaft is configured to deliver measurement air therein. It may have an air flow path and at least one air nozzle connected to the air flow path and injecting the measurement air and corresponding to the plurality of bores.

In one embodiment, the fixing portion, the first fixing portion connected to the gauge shaft; And a second fixing part connected to the first fixing part and inserted into the adjacent journal.

In one embodiment, the outer surface of the second fixing portion may correspond to the inner surface of the adjacent journal.

In one embodiment, the fixing portion may further have a gripping portion to adjustably fix the second fixing portion to the adjacent journal.

In one embodiment, the gripping portion secures the second fixing portion to the adjacent journal as it rotates in a first direction and rotates the second fixing portion to the adjacent journal as it rotates in a direction opposite to the first direction. Can be unlocked.

In one embodiment, at least one of the plurality of bores is an oil seal bore and the other bores may be crank bores or cam bores.

In one embodiment, the fixing portion may be inserted into the oil seal bore.

In one embodiment, the diameter of the oil seal bore may be larger than the diameter of the crank bores or the diameter of the cam bores.

In one embodiment, the gauge shaft may rotate at least one revolution.

In one embodiment, the air nozzle may inject the measurement air toward the inner surface of the journal to be measured.

In one embodiment, the air gauge, a hose connected to the air flow path; And a pneumatic source for supplying measurement air to the hose.

In an embodiment, the air flow passage may include: a first air flow passage connected to the hose and extending along a length direction of the gauge shaft; And a second air flow path connecting the first air flow path and the air nozzle.

In an embodiment, the air flow passage may include: a first air flow passage connected to the hose and extending along a length direction of the air gauge; A second air passage connected to the air nozzle; And a third air flow path connecting the first air flow path and the second air flow path.

In one embodiment, the air gauge may further include a pressure sensor for measuring the pressure of the measuring air injected from the air nozzle.

A measuring device according to another embodiment of the present invention is a measuring device for measuring the processing precision of multi-journals each having a plurality of bores arranged to receive a crankshaft or camshaft, which is inserted into the journal to be measured of the multi-journals. And a gauge shaft having an air passage for delivering measurement air therein and at least one air nozzle connected to the air passage for injecting the measurement air, and fastened to the gauge shaft, An air gauge having a fixing portion inserted into an adjacent journal adjacent to a measurement journal to secure the gauge shaft; And a controller for calculating roundness or concentricity of the bores based on the measurement air.

In one embodiment, the measuring device further comprises a pressure sensor for measuring the pressure of the measuring air injected from the air nozzle, the control unit receives the electrical signal from the pressure sensor or the roundness of the bore or Concentricity can be calculated.

In one embodiment, the measuring device may further include a communication unit or a display receiving an electrical signal from the control unit.

A measuring method according to another embodiment of the present invention is a measuring method for measuring processing accuracy of multi-journals each having a plurality of bores arranged to receive a crank shaft or a cam shaft. Inserting in; Securing the fixture of the air gauge to an adjacent journal; Measuring a pressure value of measurement air injected from an air nozzle of the gauge shaft according to the rotation of the gauge shaft; And calculating roundness or concentricity of the plurality of bores.

In one embodiment, measuring the pressure value of the measuring air, it can be measured continuously in a state of rotation of a predetermined angle of the gauge shaft.

In one embodiment, measuring the pressure value of the measuring air, it can be measured discontinuously in a state of rotation of the predetermined angle of the gauge shaft.

According to an embodiment of the present invention, the gauge shaft is inserted into the journal under measurement so that the gauge shaft for evaluating roundness and concentricity is aligned and unaligned to the journal under measurement by a fixing part inserted into an adjacent adjacent journal. An air gauge can be provided which can reliably and / or simultaneously measure machining precision such as roundness and concentricity of the bores without a separate jig for fixing.

In addition, according to another embodiment of the present invention, a measuring device including an air gauge having the above-described advantages can be provided.

In addition, according to another embodiment of the present invention, a measuring method having the above-described advantages can be provided.

Figure 1a is a perspective view showing an air gauge according to an embodiment of the present invention, Figure 1b is a perspective view of the air gauge according to an embodiment of the present invention from another side.
Figure 2 is a perspective view for explaining the measurement of a plurality of bores provided in the cylinder head using an air gauge according to an embodiment of the present invention.
3A is a perspective view illustrating a gauge shaft of an air gauge inserted into a journal under measurement according to an embodiment of the present invention. It is a perspective view showing a state.
Figure 4a is a side view showing the gauge shaft of the air gauge according to an embodiment of the present invention, Figure 4b is a cross-sectional view showing the inside of the gauge shaft of the air gauge according to an embodiment of the present invention.
5 is a cross-sectional view schematically showing an air gauge according to an embodiment of the present invention.
6 is a perspective view showing an air gauge according to another embodiment of the present invention.
7 is a perspective view showing an air gauge according to another embodiment of the present invention.
8 is a block diagram showing a measuring device including an air gauge according to another embodiment of the present invention.
9 is a flowchart illustrating a measuring method according to another embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art, and the following examples can be modified in many different forms, and the scope of the present invention is as follows. It is not limited to an Example. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the inventive concept to those skilled in the art.

In the drawings like reference numerals refer to like elements. In addition, as used herein, the term "and / or" includes any and all combinations of one or more of the listed items.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the scope of the invention. In addition, although described in the singular in this specification, the plural forms may be included unless the singular in the context clearly indicates. Also, as used herein, the terms "comprise" and / or "comprising" specify the shapes, numbers, steps, actions, members, elements and / or presence of these groups mentioned. It does not exclude the presence or addition of other shapes, numbers, operations, members, elements and / or groups.

In addition, for those skilled in the art, a structure or shape disposed "adjacent" to another shape may have portions that overlap or are disposed below the adjacent shape.

In this specification, "below", "above", "upper", "lower", "horizontal" or "vertical" Relative terms such as may be used to describe the relationship that one component member, layer or region has with another component member, layer or region, as shown on the figures. It is to be understood that these terms encompass not only the directions indicated in the figures, but also other directions of the device.

In the following, embodiments of the present invention will be described with reference to cross-sectional views schematically showing ideal embodiments (and intermediate structures) of the present invention. In these figures, for example, the size and shape of the members may be exaggerated for convenience and clarity of description, and in actual implementation, variations of the illustrated shape may be expected. Accordingly, embodiments of the invention should not be construed as limited to the specific shapes of the regions shown herein. Also, reference numerals of members in the drawings refer to the same members throughout the drawings.

Figure 1a is a perspective view showing an air gauge 100 according to an embodiment of the present invention, Figure 1b is a perspective view of the air gauge 100 according to an embodiment of the present invention from another side.

1A and 1B, an air gauge 100 according to an embodiment of the present invention may include a gauge shaft 101 and a fixing part 201. The gauge shaft 101 has a length direction and may have at least one air flow path therein. The gauge shaft 101 may be made of a metal material. The gauge shaft 101 may include a first gauge shaft portion 111 having a first outer diameter and a body portion 107 for supporting the first gauge shaft portion 111. In one embodiment, the air gauge 100 has a second outer diameter greater than the first outer diameter with the first gauge shaft portion 111 and a second gauge coaxial with the first gauge shaft portion 111. The shaft unit 113 may further include. In this case, the second gauge shaft portion 113 is disposed between the body portion 107 and the first gauge shaft portion 111, the body portion 107 together with the first gauge shaft portion 11 and the second gauge. The shaft portion 113 may be supported.

The first gauge shaft 111 may have a cylindrical shape and may have at least one air nozzle 105b, 105c, 105d, or 105e. In one embodiment, the second gauge shaft portion 113 may be integrally formed with the first gauge shaft 111. The second gauge shaft 113 may also have at least one air nozzle 105a. In another embodiment, the first gauge shaft portion 111 and the second shaft portion 113 may be formed separately, and the first gauge shaft portion 111 and the second gauge shaft portion 113 are screwed together. Or may be fastened or coupled in various ways such as clamps.

The body portion 107 may support the first gauge shaft portion 111 and the second gauge shaft portion 113 such that the first gauge shaft portion 111 and the second gauge shaft portion 113 are rotated. The first gauge shaft portion 111 and the second gauge shaft portion 113 may rotate at different speeds by rotating integrally with each other or by rotating independently of each other.

In one embodiment, the motor 108 for rotating the first gauge shaft portion 111 and / or the second gauge shaft portion 113 may be mounted inside the body portion 107. Motor 108 may be, by way of non-limiting example, a DC motor or a servo motor. The motor 108 may be any motor capable of precisely controlling the rotation speed, for example, an AC motor. The motor 108 can rotate the first gauge shaft portion 111 and the second gauge shaft portion 113 in any one direction as indicated by arrow K while being supported in the body portion 107. have. The rotation of the motor 108 rotates or rotates the first gauge shaft 111 and the second gauge shaft 113 in one direction such as clockwise or counterclockwise depending on the measurement mode. It can also be rotated. The air gauge 100 according to an embodiment of the present invention may further include a wire 122 electrically connected to the motor 108 through one end of the body 107. Power may be supplied to the motor 108 via the wires 122.

The fixing part 201 may include a first fixing part 203 extending from the body part 107 and a second fixing part 205 connected to the first fixing part 203. The first fixing part 203 may extend in a direction substantially perpendicular to the gauge shaft 101. The material of the first fixing part 203 may be metal or plastic, but is not limited thereto and may be various materials having rigidity while being less sensitive to changes in humidity and temperature. The first fixture 203 can maintain a spaced distance between the gauge shaft 101 and the second fixture 205. The second fixing part 205 may extend in a direction substantially perpendicular to the extending direction of the first fixing part 203, and may have a direction parallel to the gauge shaft 101.

The second fixing part 205 may have a circular cross section corresponding to the cross-sectional shape of the bore of the adjacent journal adjacent to the journal under measurement into which the gauge shaft 101 is inserted, as described below with reference to FIGS. 3A and 3B. . The surface of the second fixing part 205 may be a metal or a plastic, but is not limited thereto. The surface of the second fixing part 205 may be made of various materials having elasticity and frictional force such as rubber. In one embodiment, the surface of the second fixing portion 205 may be smooth or inserted into the bore of the adjacent journal to increase the friction force to secure the fixing force. Securing the frictional force of the surface of the second fixing part 205 may be achieved by forming a hatching pattern or uneven pattern on the surface.

In one embodiment, the fixing part 207 may further include a holding part 207 so that a user can handle the fixing part 207. The second fixing part 205 may be fastened to the holding part 207 by penetrating the first fixing part 203. In another embodiment, the gripping portion 207 may be engaged with the second fixing portion 205 through the first fixing portion 203. The gripping portion 207 and the second fixing portion 205 may be connected to each other by a screw fastening method.

The first fixing part 203 fixes the second fixing part 205 spaced apart from the central axis of the gauge shaft 101 by a predetermined distance with respect to the body part 107 or based on the central axis of the gauge shaft 101. It can be supported so as to be spaced apart by a predetermined distance concentric rotation. In one embodiment, the outer surface of the grip portion 207 may have a plurality of protrusions to improve the grip of the user. As the gripping portion 207 is screwed with the second fixing portion 205, the first holding portion 203 between the holding portion 207 and the second fixing portion 205 may be in close contact with each other. That is, the second fixing part 205 is fixed to the first fixing part 203 by the rotation of the grip part 207 or to the first fixing part 203 by the rotation of the other direction of the holding part 207. This can be released. According to various embodiments of the present disclosure, the gripping portion 207 is not limited to fixing and releasing the fixing of the first fixing portion 203 and the second fixing portion 205 by rotation, and various methods such as a button method. The first fixing part 203 and the second fixing part 205 can be fixed and released from each other by the method.

An interior of the air gauge 100 according to an embodiment of the present invention may include hoses 121a, 121b, 121c, 121d and 121e connected to at least one air air nozzle through one end of the gauge shaft 101. Can be. The hoses 121a, 121b, 121c, 121d, and 121e may be made of synthetic resin or rubber material. According to various embodiments of the present disclosure, the hoses 121a, 121b, 121c, 121d, and 121e are not limited to rubber materials, but may be formed of various materials such as a flexible metal material.

Figure 2 is a perspective view for explaining the measurement of a plurality of bores provided in the cylinder head 10 using the air gauge 100 according to an embodiment of the present invention.

Referring to FIG. 2, the cylinder head 10 may be part of an internal combustion engine. The cylinder head 10 may include multiple journals C1 and C2 for receiving cam shafts. The multi-journals C1 and C2 include the journal under test C1 into which the gauge shaft 101 of the air gauge 100 is inserted and the adjacent journal C2 into which the fixing part 201 of the air gauge 100 is inserted. Can have. The journal to be measured C1 may have a first oil seal bore 25a and first cam bores 25b, 25c, 25d, 25e smaller than the first oil seal bore 25a. The first cam bores 25b, 25c, 25d, and 25e may have the same size, but are not limited thereto and may have different sizes.

The adjacent journal C2 may also have second cam bores 35b, 35c, 35d, 35e smaller than the second oil seal bore 35a and the second oil seal bore 35a in the same manner as the journal C1 under measurement. . The second cam bores 35b, 35c, 35d, and 35e may have the same size, but are not limited thereto and may have different sizes. The first oil seal bore 25a and the first cam bores 25b, 25c, 25d, and 25e may be spaced apart from each other on the same axis to form a concentric circle. Similarly, the second oil seal bore 25a and the second cam bores 35b, 35c, 35d, and 35e may also be spaced apart from each other on the same axis to form a concentric circle.

The gauge shaft 101 of the air gauge 100 according to an embodiment of the present invention may be inserted into the journal C1 to be measured of the cylinder head 10. In addition, the fixing part 201 may be inserted into the adjacent journal C2. In one embodiment, when the first oil seal bore 25a has the same size as the second oil seal bore 35a, the outer diameter of the second gauge shaft portion 113 may be the same as the outer diameter of the second fixing portion 205. Can be. In another embodiment, the journal to be measured is not limited to one of the multi journals (C1), but may be the other of the multi journals (C2). In addition, the adjacent journal is not limited to the other one C1 of the multi-journals, but may be one of the multi-journals C1.

The gauge shaft 101 may be inserted into the journal C1 to be measured, and the fixing part 201 may be inserted into the adjacent journal C1 so that the measurement of the journal C1 may be performed. Air gauge 100 according to an embodiment of the present invention includes a fixing portion 201 fixed to the adjacent journal (C1), a separate jig for fixing the gauge shaft 101 and for fixing such jig The advantage is that no separate fixing position is required. In addition, since the gauge shaft 101 is prevented from shaking by the fixing part 201, the air gauge 100 can reliably measure roundness and concentricity of various bores disposed in the journal C1 to be measured. These measurements can be made at the same time through a single insertion fixation of the gauge shaft, so that roundness and concentricity can be measured simultaneously.

3A is a perspective view illustrating a state in which a gauge shaft 101 of an air gauge 100 is inserted into a journal C1 (see FIG. 2) according to an embodiment of the present invention, and FIG. 3B is an embodiment of the present invention. It is a perspective view which shows the state in which the fixing part 201 of the air gauge 100 which concerns on the example was inserted in the adjacent journal C2.

3A and 3B, the gauge shaft 101 of the air gauge 100 according to an embodiment of the present invention may be inserted into the journal C1 to be measured. In addition, the fixing part 201 may be inserted into the adjacent journal C2. The fixing part 201 may be fixed to the adjacent journal C2 by rotating in one direction. As the fixing part 201 remains fixed to the adjacent journal C2, the gauge shaft 101 connected to the fixing part 201 is connected to the inner surface of the bores 25a, 25b, 25c, 25d and 25e. There may be no contact while maintaining a certain interval. As the gauge shaft 101 is in contact with the inner surface of the bores 25a, 25b, 25c, 25d, 25e while maintaining a constant distance, the air air nozzle air nozzles 105 (FIG. 1A) formed in the gauge shaft 101 are shown. Can be used to measure the air blowing.

As the gauge shaft 101 of the air gauge 100 according to various embodiments of the present invention is fixed by the fixing unit 201, the gauge shaft 101 may rotate at least one rotation or more. As the gauge shaft 101 is rotated in a fixed state by the fixing unit 201, it is possible to prevent a decrease in measurement accuracy due to the shaking of the gauge shaft 101.

The motor 108 (see FIG. 1) installed in the body 107 may rotate the gauge shaft 101 at a predetermined angle, for example, 90 °, 180 °, 270 ° or 360 °. In addition, the motor 108 (refer to FIG. 1) may rotate the gauge shaft 101 one rotation or two or more times depending on the measurement mode. As the gauge shaft 101 rotates, the air nozzles 105 (see FIG. 1A) continuously or intermittently inject the measurement air toward the inner side of the bores 25a, 25b, 25c, 25d, 25e, The air gauge 100 may measure the roundness of each of the bores 25a, 25b, 25c, 25d, 25e and the concentricity of the bores 25a, 25b, 25c, 25d, 25e. In one embodiment, the roundness of each of the bores may be defined as the maximum value of the inner diameter measured for each bore minus the minimum value. In addition, the concentricity may be defined as the value obtained by subtracting the minimum value from the maximum value of each roundness in all the measured bores. As such, in an embodiment of the invention, the concentricity is such that the center of each of the bores 25a, 25b, 25c, 25d, 25e is precisely aligned to some extent based on the roundness and the bores 25a, 25b, 25c. , 25d, 25e) may be a measure for checking the linear arrangement state.

According to the exemplary embodiment of the present invention, since the gauge shaft 101 rotates to measure the inner diameter of the bores, the circular shape of the bore is mapped by mapping the rotation angle of the gauge shaft 101 and the maximum and minimum values of the measured inner diameter. Information as to whether it is distorted may additionally be provided with the roundness.

Figure 4a is a side view showing the gauge shaft 101 of the air gauge according to an embodiment of the present invention, Figure 4b is a cross-sectional view showing the inside of the gauge shaft 101 of the air gauge according to an embodiment of the present invention.

4A and 4B, the gauge shaft 101 of the air gauge according to an embodiment of the present invention may include air nozzles 105a, 105b, 105c, 105d, 105e, 105f, 105g, 105i, and 105j. Second air passage 104a, 104b, 104c connected to one air passage 102a, 102b, 102c, 102d, 102e and air nozzles 105a, 105b, 105c, 105d, 105e, 105f, 105g, 105i, 105j. , 104d, 104e, 104f, 104g, 104h, 104i, 104j).

One of the air nozzles 105a, 105b, 105c, 105d, 105e, 105f, 105g, 105i, 105j is one of the air nozzles 105a, 105b, 105c, 105d, 105e, 105f, 105g, 105i, 105j. Can be symmetrically positioned about the other one 105f and the gauge shaft 101. In addition, another one of the air nozzles 105b may be located symmetrically with another one of the air nozzles 105g. Further, another one of the air nozzles 105c may be located symmetrically with another one of the air nozzles 105h. Further, another one of the air nozzles 105d may be symmetrically positioned with another one of the air nozzles 105i. Further, another one of the air nozzles 105b may be located symmetrically with another one of the air nozzles 105j.

The first air flow paths 102a, 102b, 102c, 102d and 102e may be independently connected to the hoses 121a, 121b, 121c, 121d, 121e (see FIG. 1B). The first air flow paths 102a, 102b, 102c, 102d, 102e may extend along the length direction of the gauge shaft 101. One of the first air flow paths 102a, 102b, 102c, 102d, 102e may be located at the center of the gauge shaft 101. The remaining ones of the first air flow paths 102a, 102b, 102c, 102d, and 102e may be divided and positioned at a predetermined angle α with respect to the center of the gauge shaft 101.

As shown in section A-A of FIG. 4A, one of the first air flow paths 102a may be connected to the second air flow paths 104a and 104f, respectively. The second air flow paths 104a and 104f may be connected to the air nozzles 105a and 105f, respectively.

According to one embodiment of the invention, the air flow path connects between the first air flow path (102b, 102c, 102d, 102e) and the second air flow path (104b, 104c, 104d, 104e, 104g, 104h, 104i, 104j) It may have a third air flow path (106b, 106c, 106d, 106e). As shown in section B-B of FIG. 4B, one of the first air passages 102b may be connected to the second air passages 104b and 104g through the third air passage 106b. The second air flow paths 104b and 104g may be connected to the air nozzles 105b and 105g, respectively.

As shown in section C-C of FIG. 4B, one of the first air passages 102c may be connected to the second air passages 104c and 104h through the third air passage 106c. The second air flow paths 104c and 104h may be connected to the air nozzles 105c and 105h, respectively. As shown in section D-D of FIG. 4B, one of the first air flow paths 102d may be connected to the second air flow paths 104d and 104i through the third air flow path 106d. The second air flow paths 104d and 104i may be connected to the air nozzles 105d and 105i, respectively. As shown in section E-E of FIG. 4B, one of the first air passages 102e may be connected to the second air passages 104e and 104j through the third air passage 106e. The second air flow paths 104e and 104j may be connected to the air nozzles 105e and 105j, respectively.

As the air flow path of the gauge shaft 101 according to the embodiment of the present invention has the third air flow paths 106a, 106b, 106c, 106d, and 106e, the second air flow paths 104a, 104b, 104c, 104d, 104e, 104f, 104g, 104h, 104i, 104j can be disposed along the center of the gauge shaft 101, which is advantageous in design, and the first air flow paths 102a, 102b, 102c, 102d, 102e Interference with each other can be prevented by the positions of the second air flow paths 104a, 104b, 104c, 104d, 104e, 104f, 104g, 104h, 104i, 104j.

5 is a cross-sectional view schematically showing the air gauge 100 according to an embodiment of the present invention.

Referring to Figure 5, it will be described the operation of the air gauge 100 according to an embodiment of the present invention. The air gauge 100 may have a first air passage 102a and a second air passage 104a, 104f for moving the measurement air. The measurement air may be injected into the inner surface 26a of the oil seal bore 25a via the first air passage 102a, the second air passages 104a and 104f, and the air nozzles 105a and 105f. In addition, the measurement air is cam bore via the first air flow path 102b, the third air flow path 106b (see FIG. 4B), the second air flow paths 104b and 104h, and the air nozzles 105b and 105h. It can be sprayed on the inner side 26b of 25b.

Air gauge 100 according to an embodiment of the present invention by measuring the pressure of the air for measurement to be injected to the inner surface of the oil seal bore (25a) and the inner surface of the cam bore (25b, 25c, 25d, 25e) air nozzle Distance between the inner sides of the fields 105a, 105b, 105c, 105d, 105e, 105f, 105g, 105h, 105i, 105j and the oil seal bore 25a and the cam bores 25b, 25c, 25d, 25e can be measured. have. As the air gauge 100 measures the distance between the inner surface of the oil seal bore 25a and the cam bores 25b, 25c, 25d, 25e, the degree of roundness of the bores 25a, 25b, 25c, 25d, 25e is measured. The concentricity of the bores 25a, 25b, 25c, 25d, 25e can be calculated.

6 is a perspective view showing an air gauge 100 according to another embodiment of the present invention.

Referring to FIG. 6, the fixing part 201a of the air gauge 100 according to another embodiment of the present invention may have a first fixing part 203a that rotates about the gauge shaft 101. As the first fixing portion 203a rotates, the fixing portion 201a is adjacent to the adjacent journal C2 without the need to rotate with the gauge shaft 101 partially inserted into the journal under measurement C1 (see FIG. 2). It can be rotated to be inserted into.

The fixing part 201a of the air gauge 100 according to another embodiment of the present invention may have a first fixing part 203a that is stretchable along the length direction. As the length of the first fixing part 203a is extended or shortened even if the length of the first fixing part 203a does not correspond to the length between the journal C1 (see FIG. 2) and the adjacent journal C2. The fixing part 201a can be inserted into the adjacent journal C2 and fixed. According to various embodiments of the present invention, the fixing part 201a is not limited to being inserted into the plurality of bores of the cam shaft, but may be inserted into the plurality of bores of the crankshaft. In this case, the fixing part 201a may be extended by a distance between the journal under measurement C1 (see FIG. 2) and another journal having a plurality of bores of the crankshaft.

7 is a perspective view showing an air gauge 300 according to another embodiment of the present invention.

Referring to FIG. 7, the air gauge 300 according to another embodiment of the present invention may include a gauge shaft 301 and a fixing part 401, and the description of the same or similar components as the above-described embodiment. May refer to the foregoing disclosure unless otherwise contradicted.

The fixing part 401 may include a first fixing part 403 connected to the gauge shaft 301, a second fixing part 405 and a second fixing part 405 inserted into the adjacent journal C2 (see FIG. 2). And a gripping portion 407 for fastening to an adjacent journal C2 (see FIG. 2). A plurality of slits 453 may be formed on an outer surface of the second fixing part 405, and the second fixing part 405 may be made of a metal having elasticity. However, the second fixing part 405 is not limited to the metal having elasticity, and may be made of various materials such as rubber having elasticity.

The second fixing part 405 may be fixedly fixed to an adjacent journal C2 (see FIG. 2). The outer surface of the second fixing part 405 may be in the form of a cut slit 453. Since the outer surface of the second fixing part 405 is formed in the form of the cut slit 453, the second fixing part 405 can be more easily deformed. For example, the second fixing part 405 may be deformed in a radial shape while maintaining the center.

The second fixing part 405 may be screwed with the holding part 407. The gripping portion 407 can adjustably fix the second fixing portion 405 to an adjacent journal. The gripping portion 407 may rotate the second fixing portion 405 while being supported by the first fixing portion 403. As the gripping portion 407 rotates, the second fixing portion 405 may be unfolded or folded. For example, as the second fixing part 405 is unfolded or folded, the diameter of the second fixing part 405 may be changed. By changing the diameter of the second fixing portion 405, the second fixing portion 405 may be adjusted to be fixed or released from the adjacent journal C2 (see FIG. 2). When the second fixing part 405 is unfolded, the second fixing part 405 may be fixed to the adjacent journal C2 into which the second fixing part 405 is inserted. When the second fixing part 405 is folded, the second fixing part 405 may be released from the adjacent journal C2. According to various embodiments of the present disclosure, the gripping portion 407 is not limited to being screwed to the second fixing portion 405, and may unfold or fold the second fixing portion 405 in a button manner.

8 is a block diagram illustrating a measuring device 500 including an air gauge 100 according to another embodiment of the present invention.

Referring to FIG. 8, the measuring device 500 according to various embodiments of the present disclosure may include an air gauge 100, a pneumatic source 501, an adjusting unit 502, a pressure sensor 503, a controller 504, and a display. 505 may be included. The pneumatic source 501 may pressurize the air for measurement. For example, the pneumatic source 501 may be an air compressor. According to various embodiments of the present disclosure, the pneumatic source 501 is not limited to being provided separately from the air gauge 100 and may be included in the air gauge 100.

The adjusting unit 502 may be located between the pneumatic source 501 and the air gauge 100, and adjust the pressure of the measurement air. The pressure sensor 503 is located between the pneumatic source 501 and the air gauge 100, and may convert the pressure of the measurement air into an electrical signal. According to various embodiments of the present disclosure, the adjusting unit 502 and the pressure sensor 503 are not limited to being provided separately from the air gauge 100, but may be included in the air gauge 100.

The controller 504 may receive an electrical signal from the pressure sensor 503 to calculate the roundness of the bores and the concentricity of the bores. The display 505 may be connected to the controller 504 to display roundness of the bores and concentricity of the bores.

The measuring device 500 according to various embodiments of the present disclosure may further include a communication unit 506. The communication unit 506 is connected to the control unit 504, and the measured values relating to the roundness of the bores and the concentricity for evaluating the linear arrangement state of the bores may be measured by another electronic device such as a computer, a smartphone, or a storage device. It can transmit to a device that can communicate. The measured value may be displayed on the other electronic device, and stored in the other electronic device to check the trend of the defective rate of the engine component. According to various embodiments of the present disclosure, the communication unit 506 may receive a communication signal from another electronic device and remotely control the control unit 502 through the control unit 504.

9 is a flowchart illustrating a measuring method according to another embodiment of the present invention.

Referring to FIG. 9, a measuring method S10 of measuring machining precision of multiple journals each having a plurality of bores arranged to receive a crank shaft or a cam shaft according to another embodiment of the present invention may include a gauge shaft 101. 3A) (S11), the fixing unit 201 (FIG. 2A) is fixed to the adjacent journal C2 (see FIG. 2) (S13); Measuring the pressure value of the measurement air is injected from the air nozzle 105 (see Fig. 1) of the gauge shaft 101 (see Fig. 3a) according to the rotation of the gauge shaft 101 (see Fig. 3a) (S15) and a plurality of Computing the roundness of the bores or the concentricity of the plurality of bores of (S17) may be included.

Measuring the pressure value of the measuring air (S15) may be to measure continuously in the rotation state of the predetermined angle of the gauge shaft 101. The predetermined angle may be 90 °, 180 °, 270 ° or 360 °. According to various embodiments of the present disclosure, the step (S15) of measuring the pressure value of the measuring air may be measured discontinuously in the rotation state of the predetermined angle of the gauge shaft 101. For example, it can measure every time the gauge shaft 101 rotates by an angle. The predetermined angle may be smaller than the predetermined angle. For example, the predetermined angle may be smaller than the predetermined angle, such as 5 degrees and 10 degrees.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and alterations are possible within the scope without departing from the technical spirit of the present invention, which are common in the art. It will be apparent to those who have knowledge.

10: cylinder head 100: air gauge
101: gauge shaft 105: air nozzles
201: fixed part 203: first fixed part
205: second fixing portion 207: gripping portion

Claims (20)

An air gauge for measuring the machining precision of multiple journals each having a plurality of bores arranged to receive a crank shaft or cam shaft,
A gauge shaft inserted into the journal under measurement of the multi-journals; And
A fixing portion fastened to the gauge shaft and inserted into an adjacent journal adjacent to the journal under measurement of the multi-journals to fix the gauge shaft,
The gauge shaft has an air flow path for delivering the measurement air therein and at least one air nozzle connected to the air flow path and injects the measurement air and is arranged to correspond to the plurality of bores. The method of claim 1,
The fixing part,
A first fixing part connected to the gauge shaft; And
An air gauge connected to said first fixture and having a second fixture inserted into said adjacent journal. The method of claim 2,
An outer side surface of the second fixing part corresponds to an inner side surface of the adjacent journal. The method of claim 2,
And the fixing portion further has a gripping portion for adjustablely fixing the second fixing portion to the adjacent journal. The method of claim 4, wherein
The gripping part may be configured to fix the second fixing part to the adjacent journal as it rotates in a first direction, and to release the second fixing part to the adjacent journal as it rotates in a direction opposite to the first direction. . The method of claim 1,
At least one of the plurality of bores is an oil seal bore, and the other bores are crank bores or cam bores. The method of claim 6,
The fixing part is inserted into the oil seal bore air gauge. The method of claim 6,
The diameter of the oil seal bore is greater than the diameter of the crank bores or the diameter of the cam bores. The method of claim 1,
The gauge shaft is rotatable air gauge at least one rotation. The method of claim 1,
The air nozzle, the air gauge for injecting the air for measurement toward the inner surface of the journal to be measured. The method of claim 10,
A hose connected to the air passage; And
Air gauge further comprises a pneumatic source for supplying the measurement air to the hose. The method of claim 10,
The air flow path,
A first air passage connected to the hose and extending along a length direction of the gauge shaft; And
An air gauge having a second air flow path connecting the first air flow path and the air nozzle. The method of claim 10,
The air flow path,
A first air passage connected to the hose and extending in a length direction of the air gauge;
A second air passage connected to the air nozzle; And
An air gauge having a third air flow path connecting the first air flow path and the second air flow path. The method of claim 11,
Air gauge further comprises a pressure sensor for measuring the pressure of the measuring air injected from the air nozzle. A measuring device for measuring the machining precision of multiple journals each having a plurality of bores arranged to receive a crank shaft or a cam shaft,
A gauge shaft having an air flow passage for inserting measurement air therein, the at least one air nozzle connected to the air flow passage for injecting the measurement air therein; An air gauge fastened to and inserted into an adjacent journal adjacent to the journal to be measured of the multi-journals to secure the gauge shaft; And
And a control unit for calculating roundness or concentricity of the bores based on the measurement air. The method of claim 15,
Further comprising a pressure sensor for measuring the pressure of the measuring air injected from the air nozzle,
The control unit receives the electrical signal from the pressure sensor to calculate the roundness or concentricity of the bores. The method of claim 16,
The measuring device further comprises a communication unit or a display receiving an electrical signal from the control unit. A measuring method for measuring the machining precision of multiple journals each having a plurality of bores arranged to receive a crank shaft or cam shaft,
Inserting a gauge shaft of the air gauge into the journal under measurement;
Securing the fixture of the air gauge to an adjacent journal;
Measuring a pressure value of measurement air injected from an air nozzle of the gauge shaft according to the rotation of the gauge shaft; And
Calculating the roundness or concentricity of the plurality of bores. The method of claim 18,
Measuring the pressure value of the measuring air, measuring method continuously measured in a state of rotating the predetermined angle of the gauge shaft. The method of claim 18,
Measuring the pressure value of the measuring air, the measurement method of measuring discontinuously in a state of rotating the predetermined angle of the gauge shaft.

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