KR20220006282A - Camshaft assembly angle measuring device and method for measuring camshaft assembly angle using the same - Google Patents

Abstract

The present invention can provide a camshaft assembly angle measurement device which comprises: a base frame supporting a camshaft to be horizontally supported; a camshaft measurement means coupled to the base frame and measuring a position of a key groove; a sensor piece measurement means coupled to the base frame and measuring a position of a sensor piece; and a measurement control unit measuring an assembly angle of the camshaft. According to the present invention, a measurement reference (a reference angle) of the sensor piece can be clearly set, thereby improving reliability of a measurement value of a cam phase angle assembly angle.

Description

Camshaft assembly angle measuring device and method for measuring camshaft assembly angle using the same {Camshaft assembly angle measuring device and method for measuring camshaft assembly angle using the same}

The present invention relates to a camshaft assembling angle measuring apparatus and a camshaft assembling angle measuring method using the same. A camshaft assembly angle measuring apparatus and a camshaft assembly angle measuring method using the same.

BACKGROUND ART In general, an internal combustion engine of a vehicle mixes fuel and air that are vaporized or sprayed like mist in a cylinder, and explosively combusts the mixture to obtain power to drive the engine. At this time, a valve is provided on the upper part of the cylinder to allow air to flow into the cylinder, and a cam shaft is used as a device for opening and closing the valve. A plurality of cams having different phases are fixed to the camshaft at a predetermined interval on the outer periphery of the shaft formed with a predetermined length and thickness, and as the camshaft rotates, the valve in contact with the cam is opened and closed.

On the other hand, as a method for fixing the cam to the shaft, there are an integral assembly type in which the shaft and the cam are integrally formed by casting an alloy cast iron, and a hollow assembly type in which the cam is coupled to a hollow shaft made of a drawn steel pipe. Among these, in the case of the integrated prefabricated manufacturing method, since it is a manufacturing method by a casting method, automation is difficult due to the nature of the work process and productivity is low, and an additional work process such as a heat treatment process is required for surface modification. In addition, since the weight is heavy, there is a limitation in responding to the trend of weight reduction across the engine parts, and there are disadvantages such as a decrease in fuel efficiency of an engine for an internal combustion engine.

Accordingly, there is a prefabricated camshaft manufacturing method in which the shaft and the cam are separately assembled in order to solve the disadvantages of the camshaft manufactured by the integral assembly type. This prefabricated camshaft manufacturing method can significantly reduce the weight compared to a camshaft manufactured by an integrated assembly type, and various assembly pieces such as cams, journals, sensors, and drive gears can be made of different materials according to their respective functions and needs. There are advantages such as forming and assembling with

On the other hand, in this method of assembling the prefabricated camshaft, after assembling the shaft and the cam, using a phase angle adjusting device, etc., the cam lobes provided in each part piece have the correct phase angle to measure the cam phase angle assembling angle. There is a need. Accordingly, in the prior art, a technique for detecting the position of the cam through a servo motor and an optical sensor is used to measure the cam phase angle.

However, since this conventional cam phase angle assembly angle measuring device is a method of measuring the position of the cam by rotating the servo motor and detecting the position of the optical sensor, the position of the cam is stopped at the set angle (eg: 9 degrees) and then moved to the 0 degree position. The optical sensor not only does not guarantee the position of 0 degree, but also an error occurs at the 9 degree stop position, resulting in a large measurement error of the entire cam phase angle assembling angle.

Republic of Korea Patent Registration No. 10-0285495

An object of the present invention is to provide a camshaft assembling angle measuring device and a camshaft assembling angle measuring method using the camshaft assembling angle measuring apparatus capable of improving reliability and stabilization of a product by improving the reliability of a camshaft cam phase angle assembling angle measurement value. .

According to one aspect of the present invention, the present invention includes a base frame having a key groove formed on an outer circumferential surface of one end portion, a sensor piece coupled to the other end portion, and supporting a camshaft to which a plurality of cams are coupled to be horizontally positioned; a camshaft measuring means coupled to the base frame and positioned at one side of the camshaft to measure the position of the camshaft through the position of the keyway; a sensor piece measuring means coupled to the base frame and positioned on the other side of the camshaft to measure the position of the sensor piece; The camshaft measuring means and the sensor piece measuring means are respectively controlled, and the position of the camshaft and the sensor piece are respectively received from the camshaft measuring means and the sensor piece measuring means, and the position of the sensor piece is determined based on the position of the camshaft. It is possible to provide a camshaft assembling angle measuring device, characterized in that it comprises; a measurement control unit for measuring the assembling angle of the camshaft by measuring.

Here, the camshaft measuring means includes a first support frame installed on the upper surface of the base frame, a support unit coupled to the first support frame, and connected to the support unit and axially connected to the camshaft so that the axis of the camshaft is used as a rotation axis. It may be configured to include a shaft connection unit configured to include a rotating rotating unit, a driving unit for rotating the rotating unit, and a keyway sensing unit coupled to the support unit and the rotating unit to detect the position of the camshaft.

At this time, the keyway sensing unit is coupled to the rotation unit to rotate in conjunction with the camshaft, and a sensor dog positioned in a horizontal position corresponding to the keyway, coupled to the support unit, and measuring displacement with the sensor dog to measure the keyway It may be configured to include a key home detection sensor for detecting the position of the.

The keyway detection sensor may be applied as a Linear Variable Differential Transformer (LVDT) sensor.

On the other hand, the sensor dog, the outer peripheral surface is formed in a round shape along the circumferential direction, it may be configured such that the position of the highest point having the highest radius and the position of the keyway are the same.

Accordingly, the keyway detection sensor may be configured such that, due to the round shape of the sensor dog, the displacement value output signal outputs the highest output value at the highest point position of the sensor dog, and the position at which the highest output value is output becomes the position of the keyway.

The sensor piece measuring means may include a second support frame installed on the upper surface of the base frame to support the other side of the camshaft, and a sensor piece detecting unit coupled to the second support frame and detecting the sensor piece. have.

Here, the sensor piece sensing unit may be applied as an LVDT (Linear Variable Differential Transformer) sensor that detects a displacement of the sensor piece with the sensing protrusion groove during rotation of the sensor piece.

Furthermore, the sensor piece measuring means may further include a forward/backward driving module installed on the second support frame to move the sensor piece sensing unit forward or backward toward the camshaft.

On the other hand, the measurement control unit sets the position at which the highest output value is output from the keyway detection sensor as a reference, and measures the position of the sensor piece corresponding to the reference setting position to measure the cam phase angle assembly angle of the camshaft. can be

According to another aspect of the present invention, in order to measure the assembly angle of the camshaft to which a keyway is formed on the outer peripheral surface of one end, a sensor piece is coupled to the other end, and a plurality of cams are coupled, the shaft is moved to one side of the camshaft. a measuring means arranging step of arranging the camshaft measuring means so that the connecting unit is axially connected, and disposing the sensor piece measuring means so that the second support frame is supported on the other side of the camshaft and the other side of the camshaft is supported; rotating the camshaft through a driving unit of the camshaft measuring means; In a state in which the camshaft is rotating, the camshaft measuring means measures the keyway, the sensor piece measuring means measures the position of the sensor piece, and the camshaft assembly angle is measured through the measured keyway position measurement value and the sensor position measurement value. It is possible to provide a camshaft assembling angle measuring method, characterized in that it comprises the assembly angle measuring step.

Here, in the assembly angle measurement step, the position at which the highest output value is output from the keyway detection sensor is set as a reference, and the position of the sensor piece corresponding to the reference setting position is measured to measure the cam phase angle assembly angle of the camshaft can be configured to

In addition, the sensor dog, the exposed outer peripheral surface is formed in a round shape along the circumferential direction, and is configured so that the position of the highest point having the highest radius and the position of the keyway are positioned equally, and the assembling angle measuring step is in the round shape of the sensor dog By this, the output signal of the camshaft measuring means outputs the highest output value at the highest point of the sensor dog, and the position at which the highest output value is output becomes the position of the keyway, and based on the position at which the highest output value is output from the camshaft measuring means. By measuring the position of the sensor piece, the cam phase angle assembly angle of the cam shaft can be measured.

In addition, in the measuring means arrangement step, when the camshaft rotates, the forward/backward driving module moves the sensor piece measuring means forward toward the sensor piece, and after the measurement, the sensor piece measuring means is configured to move backward and backward from the sensor piece. can

The camshaft assembling angle measuring device and the camshaft assembling angle measuring method using the same according to the present invention are different from measuring by moving the cam position to the conventional servomotor rotation and optical sensor position, the vertex in the output value of the keyway sensor is After measuring the starting point, the measured vertex point is designated as the reference origin, and by measuring the sensor piece position value accordingly, the measurement standard (reference angle) of the sensor piece can be clearly set, so the cam phase angle assembly angle can provide the effect of improving the reliability of the measured value.

In addition, the camshaft assembling angle measuring apparatus and the camshaft assembling angle measuring method using the same according to the present invention can improve product stabilization and reliability through reliable camshaft phase angle assembling angle measurement values, and reduce master repetition deviation. can be minimized

1 is a perspective view showing a camshaft assembly angle measuring apparatus according to an embodiment of the present invention.
2 is a front view showing a camshaft assembly angle measuring apparatus according to an embodiment of the present invention.
3 is a perspective view showing a camshaft measuring means in the camshaft assembly angle measuring apparatus according to an embodiment of the present invention.
4 is a perspective view showing a detailed configuration of a keyway sensing unit in the camshaft measuring means of the camshaft assembly angle measuring device according to an embodiment of the present invention.
5 is a perspective view showing the sensor piece measuring means in the camshaft assembly angle measuring device according to the embodiment of the present invention.
6 is a view showing a sensor piece sensing unit for a camshaft in the sensor piece measuring means of the camshaft assembly angle measuring device according to an embodiment of the present invention.
7 is a block diagram showing the control flow of the measurement control unit in the camshaft assembly angle measuring apparatus according to the embodiment of the present invention.
8 is a diagram illustrating a principle of measuring a sensor piece measured value of a sensor piece measuring unit based on an output value of a camshaft measuring unit in the camshaft assembly angle measuring device according to an embodiment of the present invention.
9 to 11 are perspective views illustrating a camshaft assembly angle measuring method according to an embodiment of the present invention.

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

The terms used in the present invention have been selected as currently widely used general terms as possible while considering the functions in the present invention, but these may vary depending on the intention or precedent of a person skilled in the art, the emergence of new technology, and the like. In addition, in a specific case, there is a term arbitrarily selected by the applicant, and in this case, the meaning will be described in detail in the description of the corresponding invention. Therefore, the term used in the present invention should be defined based on the meaning of the term and the overall content of the present invention, rather than the name of a simple term. In the entire specification, when a part "includes" a certain element, this means that other elements may be further included, rather than excluding other elements, unless otherwise stated. In addition, terms such as "unit", "module", "means", etc. described in the specification mean a unit that processes at least one function or operation, which is implemented in hardware or software, or is a combination of hardware and software. can be implemented.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art can easily implement them. However, the present invention may be embodied in several different forms and is not limited to the embodiments described herein. And in order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification.

First, the camshaft assembling angle measuring apparatus and the camshaft assembling angle measuring method according to the embodiment of the present invention are different from measuring the phase angle assembling angle of the camshaft 10 through the conventional servomotor control, keyway By measuring the position of the camshaft and the sensor P switch through the position, and measuring the sensor P switch based on the measured cam shaft position, a clearer measurement standard of the sensor piece 12 and the measurement standard of the cam phase angle assembling angle can be obtained. Since it can be provided, it is possible to improve the reliability of the camshaft 10 assembling angle measurement value, thereby improving the stability and reliability of the product.

This is different from the prior art, in which the standard of the sensor piece 12 was determined by the rotation of the servo motor and the optical sensor position sensing, where the reference value angle was shaken and the error occurred frequently and the error angle was large. By setting the reference value of the sensor piece 12 as be able to

Hereinafter, the camshaft assembly angle measuring apparatus according to the embodiment of the present invention will be described.

First, in the camshaft assembly angle measuring apparatus according to an embodiment of the present invention, a key groove 11 is formed on the outer peripheral surface of one end, and a plurality of sensing protrusion grooves having a set shape are formed on the outer peripheral surface at the other end of the sensor piece 12. is coupled and configured to measure the assembling angle of the cam phase angle of the camshaft 10 to which the plurality of cams are coupled. As shown in FIGS. 1 and 2, the base frame 100 and the camshaft measuring means ( 200) and the sensor piece measuring means 300 may be included.

The base frame 100 supports the camshaft measuring means 200 and the sensor piece measuring means 300 , and may be configured such that the camshaft 10 is located in the center as shown.

The base frame 100 includes a camshaft measuring means 200 in a plate shape, a work frame 110 on which the sensor piece measuring means 300 is seated on an upper surface, and four pieces coupled to the lower portion of the work frame 110 . It may be configured to include a support unit (120).

Here, the work frame 110, the work hole 111 may be formed so that the camshaft module 20 coupled to the camshaft 10 located horizontally in the center is located. Since the height of the camshaft module 20 is high as shown, if the camshaft module 20 is seated on the upper surface of the work frame 110 as it is, the camshaft measuring means 200 corresponds to this. And the position of the sensor piece measuring means 300 is also high, so it is not only inconvenient to work but also increases the manufacturing cost accordingly, so that the camshaft module 20 is located at a certain height below the upper surface of the work frame 110 . By doing so, the overall height of the camshaft 10 is lowered.

On the other hand, the camshaft module 20 may be configured to include rollers in contact with a plurality of cam knobs coupled to the camshaft 10 and a plurality of frames supporting the camshaft 10 . A detailed description will be omitted.

Hereinafter, the camshaft measuring means 200 will be described with reference to FIGS. 3 and 4 .

The camshaft measuring means 200 is coupled to the base frame 100, is located on one side of the camshaft 10, and is formed in a keyway 11 (refer to FIGS. 5 and 6) on one side of the outer peripheral surface of the camshaft 10. It serves to measure the position. Here, the camshaft measuring means 200 may be configured to measure the position of the camshaft 10 based on the position of the keyway 11, and accordingly, hereinafter, based on the sensing of the keyway 11, so let's take a look.

In detail, the camshaft measuring means 200 may include a first support frame 210 , a shaft connection unit 220 , a driving unit 230 , and a keyway sensing unit 240 .

The first support frame 210 is installed on the upper surface of the base frame 100 and serves to support the shaft connection unit 220 , the driving unit 230 , and the keyway sensing unit 240 .

The shaft connection unit 220 is coupled to the first support frame 210 and is configured to be connected to the camshaft 10 . The shaft connection unit 220 includes a support unit 221 coupled to the first support frame 210 , and a rotation unit 222 coupled to the support unit 221 and rotating with the axis of the camshaft 10 as a rotation axis. It may be composed of

The support unit 221 is fixed to the first support frame 210 without rotating in combination with the first support frame 210 , and is configured to support the rotation unit 222 and the driving unit 230 . can In the drawing, the support unit 221 is configured in a block structure and installed on the upper surface of the first support frame 210 , and a plurality of support units 221 may be disposed along the rotation unit 222 .

Next, the rotation unit 222 may be connected to the support unit 221 and configured to rotate in conjunction with the camshaft 10 using the axis of the camshaft 10 as a rotation axis. Here, the rotation unit 222 has a conical shape and a rotation chuck part 2221 fitted into an insertion groove formed at one end of the camshaft 10, and the rotation chuck part 2221 and is axially connected to the shaft of the camshaft 10. It is disposed coaxially with the driving unit 230 and may be configured to include a rotating shaft portion 2222 to rotate.

The driving unit 230 serves to axis-rotate the rotation unit 222 . The driving unit 230 may use a known servo motor as a driving source, but is not limited thereto.

On the other hand, the driving unit 230 may reciprocate the support unit 221 , and when measuring the camshaft assembly angle, the support unit 221 moves forward toward the camshaft 10 , and after the measurement is completed, the other cam When setting the shaft 10, it may be configured to move backward.

Accordingly, the driving unit 230 includes a connection member 232 coupled to the support unit 221 and coupled to the connection member 232 to reciprocate the connection member 232 and the support unit 221 as shown. A moving module 233 and a guide part 234 installed on the upper surface of the first support frame 210 and coupled with the support unit 221 to guide the support unit 221 when the support unit 221 is moved. can be configured.

Here, the moving module 233 may be configured to include a piston rod and a hydraulic (air) cylinder, as shown, but if it can reciprocate the support unit 221 in one embodiment, it is a motor driven configuration Various configurations may be applied.

The keyway sensing unit 240 is coupled to the support unit 221 and the rotation unit 222 , respectively, and serves to detect the position of the keyway 11 of the camshaft 10 . In detail, the keyway detection unit 240 may include a sensor dog 241 and a keyway detection sensor 242 .

The sensor dog 241 is coupled to the rotation unit 222 to rotate in conjunction with the camshaft 10 , and is positioned at a position corresponding to the phase angle of the keyway 11 .

Here, the sensor dog 241 may be configured such that the exposed outer peripheral surface is formed in a round shape along the circumferential direction, so that the position of the highest point having the highest radius and the position of the keyway 11 are the same. Furthermore, the sensor dog 241 may be formed to have magnetic properties from a horseshoe magnet or the like.

The keyway detection sensor 242 may be coupled to the support unit 221 to measure a displacement with the sensor dog 241 to detect the position of the keyway 11 . The keyway detection sensor 242 may be applied as a Linear Variable Differential Transformer (LVDT) sensor.

Here, in the keyway detection sensor 242, the maximum output value is output at the position where the displacement value output signal is the highest point of the sensor dog 241 by the round shape of the sensor dog 241, and the position at which the highest output value is output is the keyway 11 ) can be configured to be the location of (see Fig. 8 (a)).

On the other hand, the camshaft measuring means 200 is coupled to the rotational shaft portion 222 and docked in the keyway 11 of the camshaft 10 , and the camshaft 10 rotates in conjunction with the rotating rotational shaft portion 222 . It may include a docking module 243 to enable it.

The docking module 243 may include a docking key 2431 coupled to the pivot shaft 222 and a key sensing means 2432 provided on the docking key 2431 to sense the key. In the docking module 243, when the support unit 221 advances toward the camshaft 10 by the driving unit 230 when measuring the camshaft position, the docking key 2431 is fitted and coupled to the keyway 11, the cam The shaft 10 and the rotating shaft portion 2222 are docked.

Hereinafter, the sensor piece measuring means 300 will be described with reference to FIGS. 5 and 6 .

The sensor piece measuring means 300 is coupled to the base frame 100 , located on the other side of the camshaft 10 , and serves to measure the position of the sensor piece 12 coupled to the other side of the camshaft 10 . do.

The sensor piece measuring means 300 may be configured to include a second support frame 310 , a sensor piece detecting unit 320 , and a forward/backward driving module 330 .

The second support frame 310 is installed on the upper surface of the base frame 100 to support the sense piece sensing unit and the forward/backward driving module 330, and the other side of the camshaft 10 is connected to the camshaft ( 10) may be configured to support.

The sensor piece sensing unit 320 may be coupled to the second support frame 310 to detect the sensing protrusion groove of the sensor piece 12 . Here, the sensor piece 12 is dimensioned according to the angle related to the cam coupled to the camshaft 10 and the corresponding sensing groove, and the sensing groove and the sensing protrusion are precisely formed along the cam profile and phase angle. processed

On the other hand, the detailed description of the sensor piece 12 can be applied to the configuration of the sensor piece 12 of the known vehicle camshaft 10, a detailed description thereof will be omitted.

The sensor piece detecting unit 320 may be a displacement measuring sensor that detects a displacement with the sensing protrusion groove when the sensor piece 12 is rotated by rotating the camshaft 10 . Here, the displacement measuring sensor, although the above-described LVDT sensor can be applied, various configurations such as an optical sensor can be applied as long as the sensing protrusion groove can be sensed, and a detailed description thereof will be omitted.

Although not shown, the forward/backward driving module 330 is installed on the second support frame 310 and serves to move the displacement measuring sensor forward or backward toward the camshaft 10 . The forward/backward driving module 330 may include a reciprocating module for moving the second support frame 310 forward and backward, and a guide unit 234 for guiding the second support frame 310 . Here, the reciprocating module may have various configurations, such as a configuration including a known hydraulic cylinder and a piston rod, and a configuration using a motor and a gear.

Hereinafter, the measurement control unit 400 will be described with reference to FIGS. 7 and 8 . Referring to FIG. 7 , the measurement control unit 400 may drive and control the camshaft measuring means 200 and the sensor piece measuring means 300 , respectively. The measuring unit may control the driving unit 230 of the camshaft measuring means 200 to control the rotation of the rotating unit 222 and the reciprocating movement of the supporting unit 221 . In addition, the measuring unit may control the forward/backward movement driving module 330 of the sensor piece measuring means 300 to control the reciprocating movement of the second support frame 310 and the sensor piece sensing unit 320 .

The measurement control unit 400 receives the position of the keyway 11 and the position of the sensor piece 12 from the camshaft measuring means 200 and the sensor piece measuring means 300, respectively, and the received camshaft position and the sensor piece By analyzing and comparing the positions, it serves to measure the position of the sensor piece 12 and set a reference point based on the position of the keyway 11 , and to measure the phase angle assembling angle of the camshaft 10 .

In detail, the measurement control unit 400 is set based on the set time of the point at which the highest output value is output from the keyway detection sensor 242 as shown in FIG. As described above, it may be configured to measure the cam phase angle assembly angle of the cam shaft 10 through the measurement value of the sensor piece 12 for the reference set time. Accordingly, in the present invention, the reference value of the sensor piece 12 is set based on the output value measured from the keyway detection sensor 242 to clarify the reference and to reduce the occurrence of errors, so that the measurement value of the product is reliable. Of course, it can also contribute to product stabilization.

Hereinafter, a method for measuring a camshaft assembling angle using the above-described camshaft assembling angle measuring device will be described with reference to FIGS. 9 to 11 . In this case, the detailed configuration description of the camshaft assembling angle measuring device has been described above. A description thereof will be omitted.

The camshaft assembly angle measuring method according to an embodiment of the present invention may include a measuring means arrangement step, rotating the camshaft 10 , and an assembly angle measuring step.

First, in the measuring means arranging step, as shown in FIG. 9 , the camshaft measuring means 200 and the sensor piece measuring means 300 are respectively arranged and set to measure the cam phase angle assembling angle. The module 20 is placed in the work hole 111 of the base frame 100 so that the camshaft 10 is positioned in a horizontal direction at a set height.

When the disposition of the camshaft 10 is completed in this way, the sensor piece measuring means 300 is disposed on the other side of the camshaft 10 , and the camshaft measuring means 200 is disposed on one side of the camshaft 10 .

On the other hand, here, the sensor piece sensing unit 320 can move forward and backward toward the cam shaft 10 by the forward and backward driving module 330, and thus, after the cam shaft 10 is disposed, the cam shaft 10 ) is rotated to move the sensor piece sensing unit 320 forward toward the sensor piece 12, and after measurement, the sensor piece sensing unit 320 may be configured to move backward from the sensor piece 12 backward. .

When the disposition of the camshaft measuring means 200 and the sensor piece measuring means 300 on both sides of the camshaft 10 is completed in this way, the camshaft 10 rotates the camshaft 10 to measure the cam phase angle assembly angle. ) is rotated.

Referring to FIG. 10 , rotating the camshaft 10 may include docking with the camshaft 10 and rotating the camshaft.

First, in the step of docking with the camshaft 10, the camshaft measuring means 200 should be docked and shaft-connected to one side of the camshaft 10, and the sensor piece measuring means to the other side of the camshaft 10 ( 300) must be axially connected.

To this end, the other side of the camshaft 10 is shaft-connected to and supported by the second support frame 310 of the sensor piece measuring means 300 , and in this state, the camshaft measuring means 200 is connected to the driving unit 230 . It moves and is shaft-connected to the camshaft 10 . In this case, the second support frame 310 may be provided with a conical connecting chuck 311 to be shaft-connected to the other side of the camshaft 10 .

On the other hand, in the step of docking with the camshaft 10, the rotation unit 222 is connected to the camshaft 10 by the docking module 243 so that the rotation shaft part 2222 and the camshaft 10 can be synchronized and rotated. ) and docked with the keyway 11.

In this docking process, the support unit 221 is moved by the moving module 233 of the driving unit 230 to position the docking key 2431 close to the camshaft 10, and then the servo motor 231 is moved. It is rotated so that the docking key 2431 is docked to the keyway 11 .

When the camshaft 10 and the shaft connection unit 220 are connected through the docking process in this way, a step of rotating the camshaft 10 through the driving unit is performed.

Referring to FIG. 11 , in the step of rotating the camshaft 10 , the servo motor 231 of the driving unit 230 is operated in a state in which the docking key 2431 and the keyway 11 are docked to operate the rotation unit 222 ), and thus the camshaft 10 is also axially rotated.

On the other hand, when the camshaft 10 rotates at this time, the aforementioned forward/backward driving module 330 operates so that the position of the sensor piece detecting unit 320 is close to the sensor piece 12 measuring range. ) is moved.

As described above, when the camshaft 10 rotates and measurement preparation is completed, an assembly angle measurement step for measuring the cam phase angle assembly angle through the camshaft measurement means 200 and the sensor piece measurement means 300 is performed.

In the assembly angle measuring step, the camshaft measuring means 200 measures the keyway 11 while the camshaft 10 rotates, and the sensor piece measuring means 300 measures the sensing protrusion groove to measure the camshaft 10 ) and the sensor position, respectively, and the cam phase angle assembly angle of the camshaft 10 is measured through the obtained camshaft position measurement value and the sensor position measurement value.

In detail, the assembly angle measurement step is set based on the set time of the point at which the highest output value is output from the keyway detection sensor 242, and based on this set time, the cam through the measured value of the sensor piece 12. It may be configured to measure the cam phase angle assembly angle of the shaft 10 . That is, if the sensor piece measurement value for t seconds at which the position of the maximum output value of the keyway detection sensor 242 is reached while rotating the camshaft 10 is selected, it is possible to measure with the minimum error value. After that, when the keyway detection sensor 242 is turned off, the measurement is finished.

According to the above, the method for measuring the phase angle of the camshaft 10 according to the present invention is different from the conventional servo motor rotation and measuring by moving the cam position to the optical sensor position, the output value of the keyway detection sensor 242 After measuring the point of time at which the vertex becomes the apex, the measured apex point is designated as the reference origin, and the measurement standard (reference angle) of the sensor piece 12 is clearly determined by measuring the position value of the sensor piece 12 accordingly. Because it can be set, the reliability of the measured value of the cam phase angle assembly angle can be improved.

Although the present invention has been described with reference to the embodiment shown in the drawings, which is merely exemplary, it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

10: camshaft 11: keyway
12: sensor piece 20: camshaft module
100: base frame 110: work frame
120: support 111: work hole
200: camshaft measuring means 210: first support frame
220: shaft connection unit 221: support unit
222: rotation unit 2221: rotation chuck part
2222: rotation shaft 230: drive unit
231: servo motor 232: connection member
233: moving module 234: guide part
240: keyway detection unit 241: sensor dog
242: keyway detection sensor 243: docking module
2431: docking key 2432: key sensing means
300: sensor piece measuring means 310: second support frame
320: sensor piece detection unit 330: forward and backward drive module
400: measurement control unit

Claims (14)

a base frame having a key groove formed on an outer circumferential surface of one end portion, a sensor piece coupled to the other end portion, and supporting a cam shaft to which a plurality of cams are coupled to be horizontally positioned;
a camshaft measuring means coupled to the base frame and positioned at one side of the camshaft for measuring the position of the camshaft through the position of the keyway;
a sensor piece measuring means coupled to the base frame and positioned on the other side of the camshaft to measure a position of the sensor piece;
controlling the camshaft measuring means and the sensor piece measuring means, respectively, receiving the position of the camshaft and the sensor piece from the camshaft measuring means and the sensor piece measuring means, respectively, and determining the position of the camshaft A camshaft assembling angle measuring device comprising a; a measurement control unit measuring the position of the sensor piece as a reference and measuring the assembling angle of the camshaft. The method of claim 1,
The camshaft measuring means,
a first support frame installed on the upper surface of the base frame;
A shaft connection unit comprising: a support unit coupled to the first support frame;
a driving unit for shaft-rotating the rotating unit;
and a keyway sensing unit coupled to the support unit and the rotation unit to sense the position of the camshaft. 3. The method of claim 2,
The keyway sensing unit,
a sensor dog coupled to the rotation unit to rotate in conjunction with the camshaft and positioned in a horizontal position corresponding to the keyway;
and a keyway detection sensor coupled to the support unit and configured to detect a position of the keyway by measuring a displacement with the sensor dog. 4. The method of claim 3,
The keyway detection sensor is
A camshaft assembly angle measuring device, characterized in that it is an LVDT (Linear Variable Differential Transformer) sensor. 5. The method of claim 4,
The sensor dog,
The shaft assembly angle measuring device, characterized in that the outer peripheral surface is formed in a round shape along the circumferential direction, and the position of the highest point having the highest radius and the position of the keyway are the same. 6. The method of claim 5,
The keyway detection sensor is
Camshaft assembly angle measurement, characterized in that the displacement value output signal is output at the highest point position of the sensor dog due to the round shape of the sensor dog, and the position at which the highest output value is output becomes the position of the keyway Device. 7. The method of claim 6,
The sensor piece measuring means,
a second support frame installed on the upper surface of the base frame to support the other side of the camshaft;
and a sensor piece sensing unit coupled to the second support frame and sensing the sensor piece. 8. The method of claim 7,
The sensor piece sensing unit,
A camshaft assembly angle measuring device, characterized in that it is applied as an LVDT (Linear Variable Differential Transformer) sensor that detects the displacement of the sensor piece with the sensing protrusion groove when the sensor piece is rotated. 9. The method of claim 8,
The sensor piece measuring means,
and a forward/backward driving module installed on the second support frame to move the sensor piece sensing unit forward or backward toward the camshaft. 10. The method of claim 9,
The measurement control unit,
A position at which the highest output value is output from the keyway detection sensor is set as a reference, and the position of the sensor piece corresponding to the reference setting position is measured to measure the assembling angle of the cam phase angle of the camshaft, characterized in that Camshaft assembly angle measuring device. In order to measure the assembling angle of the camshaft to which a keyway is formed on the outer peripheral surface of one end, a sensor piece is coupled to the other end, and a plurality of cams are coupled,
Measuring means disposing a camshaft measuring means so that the shaft connection unit is shaft-connected to one side of the camshaft, and a sensor piece measuring means disposed so that the second support frame is supported at the other side of the camshaft and the other side of the camshaft is supported step;
rotating the camshaft through a driving unit of the camshaft measuring means;
In a state in which the camshaft rotates, the camshaft measuring means measures the position of the camshaft through the keyway, the sensor piece measuring means measures the position of the sensor piece, and the measured camshaft position measurement value and the sensor position A camshaft assembling angle measuring method comprising the step of measuring the assembling angle of the camshaft through the measured value. 12. The method of claim 11,
The camshaft measuring means,
A first support frame installed on the upper surface of the base frame, a support unit coupled to the first support frame, and a rotation unit connected to the support unit and axially connected to the camshaft to rotate with the axis of the camshaft as a rotation axis A shaft connection unit comprising a, a driving unit for shaft-rotating the rotation unit, and a keyway sensing unit coupled to the support unit and the rotation unit to detect the position of the keyway,
The keyway sensing unit,
A sensor dog coupled to the rotation unit to rotate in conjunction with the camshaft and positioned in a horizontal position corresponding to the keyway, and a sensor dog coupled to the support unit and measuring displacement with the sensor dog to determine the position of the keyway It consists of a keyway detection sensor that detects
The assembly angle measurement step is,
It is configured to set the position at which the highest output value is output from the keyway detection sensor as a reference, and measure the position of the sensor piece corresponding to the reference setting position to measure the assembling angle of the cam phase angle of the camshaft. How to measure the camshaft assembly angle. 13. The method of claim 12,
The sensor dog,
The exposed outer circumferential surface is formed in a round shape along the circumferential direction, so that the position of the highest point having the highest radius and the position of the keyway are the same,
The assembly angle measurement step is,
Due to the round shape of the sensor dog, the output signal of the camshaft measuring means outputs the highest output value at the highest point position of the sensor dog, and the position at which the highest output value is output becomes the position of the keyway, and measuring the camshaft A camshaft assembly angle measuring method, characterized in that the camshaft assembly angle is measured by measuring the position of the sensor piece based on the position where the maximum output value is output from the means. 13. The method of claim 12,
The sensor piece measuring means,
A second support frame installed on the upper surface of the base frame to support the other side of the camshaft, and a displacement measuring sensor coupled to the second support frame and sensing a displacement with the sensing protrusion groove when the sensor piece is rotated and a sensor piece sensing unit configured to include, and a forward/backward driving module installed on the second support frame to move the displacement measuring sensor forward or backward toward the camshaft,
The measuring means arrangement step is,
When the camshaft rotates, the forward/backward driving module moves the sensor piece measuring means forward toward the sensor piece, and after the measurement, the sensor piece measuring means moves backwards and backwards from the sensor piece. Assembling angle measurement method.

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