KR101999816B1 - Valve clearance measuring apparatus - Google Patents

Abstract

A valve gap measuring apparatus for measuring a gap between a cam and a valve of a cylinder head, comprising: a first lift block moved in a cam and valve measurement direction; A second lift block provided in the first lift block and moved in the same direction as the first lift block; A plurality of measurement arms rotatably coupled to the second lift block to grip and grip the outer surface of the cam; A measurement ball tip formed on each of the measurement arms and inserted into a gap between the cam and the valve; And a measurement sensor for measuring the distance between the two measurement arms which are respectively provided in the both measurement arms and are rotated.

Description

Technical Field [0001] The present invention relates to a valve clearance measuring apparatus,

The present invention relates to a valve gap measuring apparatus, and more particularly, to a valve gap measuring apparatus for measuring a gap between a valve and a cam provided in an internal combustion engine.

2. Description of the Related Art In general, an internal combustion engine called an engine is provided with an intake and exhaust valve system that is operated to interrupt the intake and exhaust of an intake and exhaust valve by rotation of a camshaft.

As shown in Fig. 1, the intake and exhaust valve system includes an intake and exhaust valve 4 provided at an upper portion of a cylinder head 1 to communicate with a combustion chamber, and an intake and exhaust valve 4 And a camshaft 2 that is provided to be rotated by a crankshaft (not shown).

The camshaft 2 is provided such that the cam 3 provided on the outer side of the camshaft 2 is in contact with the tappet 5 on the upper portion of the intake and exhaust valve 4, 3) The intake and exhaust valve 4 is opened and closed.

The intake / exhaust valve 4, which is opened by the cam 3 while being pushed by the cam 3, is thermally expanded due to the heat of combustion in the combustion chamber during operation of the engine. Damage or wear of the valve system, Which causes malfunctions and noise during opening and closing.

Therefore, in order to prevent the malfunction of the valve or the noise, it is designed and assembled so as to form a certain valve clearance between the intake / exhaust valve 4 and the cam 3 precisely.

In order to realize this, the actual engine assembly line undergoes an inspection process of assembling the valve 4 to the cylinder head 1, measuring the valve clearance, and judging whether the design criterion is correct.

1, the operator manually measures the valve clearance by using an inspection tool such as a gauge 6, which is called NO-GO. When the valve clearance is normal, the next step When the cylinder head 1 is abnormal, the cylinder head 1 is judged to be defective and the cylinder head 1 is returned to the previous step to reset the valve gap.

Therefore, since the measurement test using the inspection tool of the gauge 6 is performed by a manual operation in which the operator pushes the gauge between the cam and the valve in the production line as in the conventional art, the results of the measurement inspection are different depending on the skill of the operator There is a problem that the reliability of the measurement result is low, the productivity is low, and the quality control for the precise valve clearance is limited.

This problem is caused not only by increasing the wear rate of the valve by lowering the accuracy of the valve clearance when assembling the engine, but also by changing the opening angle of the valve, making it difficult to control the air-fuel ratio accurately, .

Therefore, in the actual production line, there is a growing demand for an inspection device capable of more precisely measuring and inspecting a valve gap when a cylinder head is assembled.

In view of this, Korean Patent Laid-Open No. 10-2015-0070878 (hereinafter referred to as "prior art document") has proposed a valve gap measuring device for an engine.

The prior art document includes a mounting frame for measuring a valve clearance between a cam and a cam provided on a camshaft provided for operating a valve in an engine, the mounting frame being provided on an upper portion of the engine in which the camshaft is assembled, A drive unit connected to the ascending / descending block and configured to selectively move the ascending / descending block toward the engine, and a driving unit connected to the ascending and descending block, A cam measurer which is slidably mounted on a cam of the camshaft and is brought into sliding contact with the upper portion of the cam of the camshaft and slidable upward and downward at a position spaced apart from the cam measurer, A cam follower connected to the cam follower and the valve inspector, the cam follower being connected to the ascending / descending block, With the rotation of the bit, there is a valve clearance measuring apparatus for an engine is disclosed which is composed of a detector for detecting the displacement of the cam contact point and the contact point valve.

The valve gap measuring apparatus of this prior art document measures the displacement of the valve and the cam generated at the time of rotating the camshaft by using a cam measurer and a valve measurer while the cam shaft with the cam is assembled to the engine, And the valve gap between the valve and the valve.

However, the valve gap measuring apparatus disclosed in the prior art document measures the displacement between the valve and the cam generated by rotating the camshaft. In the production line, the initial setting clearance between the valve and the cam installed in the production of the cylinder head It is necessary to calculate the clearance at the initial setting through the displacement between the valve and the cam. Therefore, the measurement method is complicated and since the fixed displacement set at the time of manufacture is measured by the displacement, There are difficult disadvantages.

A detailed description of the apparatus and method for measuring the gap of the valve as described above is described in detail in the following prior art documents, and thus a detailed description thereof will be omitted.

Korean Patent Publication No. 10-2015-0070878

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a cylinder head capable of automatically measuring a gap between a valve and a cam, And a valve gap measuring device for measuring the valve gap.

According to an aspect of the present invention, there is provided a valve gap measuring apparatus for measuring a gap between a cam and a valve of a cylinder head, the valve gap measuring apparatus comprising: a first lift block moved in a cam and valve measurement direction; A second lift block provided in the first lift block and moved in the same direction as the first lift block; A plurality of measurement arms rotatably coupled to the second lift block to grip and grip the outer surface of the cam; A measurement ball tip formed on each of the measurement arms and inserted into a gap between the cam and the valve; And a measurement sensor for measuring the distance between the both measurement arms which are respectively provided on the both measurement arms and are rotated.

The first elevating block is provided with a guide groove for guiding the movement of the second elevating block and is provided with a support plate for restraining the second elevating block in a movable state in the guide groove, And a seating groove may be formed in the guide groove of the first lift block to receive and fix the engagement protrusion of the second lift block.

The first lift block is provided with a through hole penetrating therethrough and a fixing hole extending from the through hole and having a diameter smaller than that of the through hole. The second lift block is moved in the through hole of the first lift block, A fixing pin may be provided.

In addition, a guider may be further provided, which is fixed to the second lift block and is provided in contact with the outer surface of the cam in measurement of the valve gap.

According to the valve gap measuring apparatus of the present invention, the measurement arm is automatically inserted between the valve and the cam provided in the cylinder head during manufacture of the cylinder head, and the clearance of the valve, that is, the fixed displacement can be automatically and precisely measured.

In addition, according to the present invention, since both the measurement ball tips provided on the both measuring arms inserted between the valve and the cam can be accurately provided between the valve and the cam, the gap between the valve and the cam can be precisely There are advantages to be able to measure.

1 is a schematic view for explaining a valve gap measuring method of a conventional internal combustion engine.
FIG. 2 is an overall configuration diagram showing a valve gap measuring apparatus according to the present invention in one direction.
FIG. 3 is an overall configuration diagram showing a valve gap measuring apparatus according to the present invention in a different direction.
4 is a front view of a valve gap measuring apparatus according to the present invention.
5 is an assembled perspective view of a measuring unit according to the invention.
6 is an exploded perspective view of a measuring unit according to the invention.
7 is a view showing a coupling structure of a fixing plate, a second lift block, and a second cylinder of the measuring unit according to the present invention.
8 is a view showing a state in which the measuring unit according to the present invention is provided in the cam.
9 is a view showing a state in which the measuring unit according to the present invention is provided in the cam.

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 are defined in consideration of the functions of the present invention and may vary depending on the intention or custom of the user or the operator. Therefore, the definitions of these terms are meant to be in accordance with the technical aspects of the present invention As well as the other.

Therefore, the term "and / or" used in the present invention is used to mean at least one of the constituents listed before and after, and "one or more" means one or more than two.

In addition, optional terms such as "first" and "second" used in the present invention are used to distinguish one element from another element, and the element is not limited thereto .

2 to 9 are views showing a valve gap measuring apparatus according to the present invention.

First, before describing the present invention, the same reference numerals are given to the same parts as those of the above-described prior art, and redundant explanations are omitted.

2 and 3, the valve gap measuring apparatus 100 according to the present invention is formed as a flat plate, and on the upper surface thereof, a cylinder head 1 A driving unit provided in the base 110 for rotating the camshaft 2 of the cylinder head 1 and a driving unit provided in the base 110 for driving the cams 2 3) and the valve (4).

2 and 3, the cylinder head 1 and the valve 4 are omitted from the base 110. The cylinder head 1 is provided with a valve 4 and a cam shaft 2 on its upper surface. And only the cam 3 and the camshaft 2 are provided on the base 110. [

A driving motor 120 for rotating the camshaft 2 of the cylinder head 1 is provided on one side of the base 110. A fixed end of the driving motor 120 is fixed to the camshaft 2 And the camshaft 2 is rotated.

The drive motor 120 may be a servo motor, and may rotate the camshaft 2 at a predetermined angle.

A plurality of supporting brackets 130 are vertically erected on the other side of the base 110 spaced apart from the driving motor 120. A fixed block 140 is mounted on the inclined upper portion of both supporting brackets 130 And is fixed in an inclined state.

The fixed block 140 is movably coupled to a moving block 150 of a driving unit to be described later.

2 and 3, the driving unit includes a moving block 150 movably coupled to one surface of the fixed block 140 in the longitudinal direction (forward or backward direction or leftward and rearward direction) of the fixed block 140, A first cylinder 151 fixed to the block 150 and a piston rod 152 provided so as to be able to move in and out of the upper end of the first cylinder 151.

A first lift block 160 to be described later is fixedly installed at the front end of the piston rod 152 so that the first lift block 160 moves in the first cylinder 151 as shown in FIG. As shown in FIG.

A guide rail 153 for guiding the first lift block 160 to be moved up and down is fixedly secured to one side of the movable block 150 and a first lift block 160 are fixed to a guider 161 which is coupled to the guide rail 153 and is moved.

The measurement unit for measuring the clearance between the valve 4 and the cam 3 is provided so as to be moved forward and backward (or right and left, hereinafter referred to as "forward and backward direction") and up and down by a drive unit.

4 to 7, the measuring unit includes a first elevating block 160 movably installed on one side of the moving block 150 and a second elevating block 160 vertically movably disposed on one side of the first elevating block 160, And a fixing plate 170 fixedly installed.

The first lift block 160 includes a guider 161 fixed to one side of the guiding rail 153 of the moving block 150 and a lower plate The extended portion 170a is formed so that its outer surface is flush with the inner surface of the guide groove 171, which will be described later.

A guide groove 171 for guiding the up / down movement of the second lift block 200, which will be described later, is vertically formed on both front and rear sides of the fixing plate 170, A seating groove 172 is formed. Therefore, the lowering of the second lift block 200 is stopped by engaging the engaging protrusion 201 of the second lift block 200, which will be described later, with the seating groove 172, and the measuring ball tip 221, which will be described later, And the other side surface is positively positioned in a state of surface contact between the valve (4) and the cam (3).

The penetration portions 173 and 175 are formed in the upper and lower sides of the inner side surface of the guide groove 171 and the penetration portions 173 and 175 are formed in the lower end portions of the penetration portions 173 and 175, Diameter fixing holes 174 and 176 are formed so as to communicate with the through-holes 173 and 175, respectively. The fixing pins 202 and 203 of the second lift block 200 to be described later which are moved in the through holes 173 and 175 are inserted and fixed to the fixing holes 174 and 176, Is fixed to the guide groove 171 of the fixing plate 170 in a fixed position.

The fixing pins 202 and 203 and the through holes 173 and 175 and the fixing holes 174 and 176 may be provided only at the upper portion or the lower portion. Since the engaging protrusion 201 of the second lift block 200 can be fixed in a state inclined to the seating groove 172 of the guide groove 171 even when the pin is engaged with the fixing hole of the through hole, 202, 203, penetrating portions 173, 175 and fixing holes 174, 176 are provided on the upper and lower portions of the inner surface of the guide groove 171, respectively, Can be engaged and fixed in the seating groove 172 of the guide groove 171 in the correct position.

A support plate 177 for preventing the second lift block 200 provided in the guide groove 171 from being detached from the guide plate 171 is fixed to the outer surface of the fixing plate 170, The second lift block 200 is spaced apart from the first lift block 177 and the second lift block 200 so that the second lift block 200 can flow while being restrained by the guide groove 171.

The second lift block 200 is vertically movably provided in the guide grooves 171 of the fixing plate 170.

6 and 7, the second lifting block 200 is formed in an inverted triangular shape at the upper end thereof and is engaged with the engaging recessed portion 201 And a hinge protrusion 204 to which a gripper 210, which will be described later, is rotatably coupled, is formed to protrude outward.

The hinge protrusion 204 of the second lift block 200 protrudes outside the guide groove 171 of the fixing plate 170 so that the hinge protrusion 204 does not interfere with the fixing plate 170 during the lifting operation of the second lift block 200 .

The fixing pins 202 and 203 are coupled to the upper and lower portions of the second lift block 200. The fixing pins 202 and 203 are inserted into the through hole 173 of the fixing plate 170, And inserted into fixing holes 174 and 176 under the penetrating portions 173 and 175 to be fixed.

The second cylinder 190 is fixed to the upper portion of the second lift block 200 and can be raised and lowered as the second lift block 200.

Further, a plurality of operating links 180 reciprocating in the width direction of the second cylinder 190 (in a direction for scissoringly operating the gripper 210 to be described later) is provided, and the operating link 180 is set to " Shaped gripper 210 is rotated in a scissor manner about the hinge portion 212 by pushing and rotating the engagement pin 211 of the gripper 210 which will be described later.

On the other hand, two grippers 210 are coupled to both sides of the hinge protrusion 204 of the second lift block 200 so as to be rotatable.

The grippers 210 are coupled to the upper ends of the grippers 210 and are rotated by the operating links 180 to rotate the grippers 210 about the hinge portions 212. The lower ends of the grip pins 210 A measurement arm 220 is fixedly provided.

An elastic member 230 is provided under the hinge portion 212 of both the grippers 210 to provide a restoring force for restoring the grippers 210 to both sides by being fixed to both grippers 210, .

The elastic member 230 is applicable to all of the member surfaces that provide a restoring force for restoring the opened grippers 210 to their original shape. In this embodiment, a tension coil spring is exemplified as an example of the elastic member 230.

The two grippers 210 under the elastic member 230 are provided with a measurement sensor 240 for measuring the movement distance of the grippers 210 when the grippers 210 are rotated. If the measured value by the measurement sensor 240 is large, the gap between the valve 4 and the cam 3 is narrow. If the measured value is small, the gap between the valve 4 and the cam 3 is large.

The measurement arm 220 coupled to the lower end of the gripper 210 is gripped by gripping the outer surface of the cam 3 while being rotated by the gripper 210. The cam 3 and the valve 4 are formed integrally with each other.

The measurement ball tip 221 may be formed in a cylindrical shape instead of a sphere. When the measurement ball tip 221 is formed in a spherical shape, the outer circumferential surface of the measurement ball tip 221 is in point contact with the outer surface of the cam 3 and the upper surface of the tappet 5 of the valve 4, The gap between the cam 3 and the valve 4 can be measured more precisely and accurately.

A plurality of measurement links 250 are fixed to the lower end of the second lift block 200. The measurement link 250 includes cams 3 to be accommodated therein, 3).

That is, the measurement links 250 on both sides are formed so that the distance therebetween is spaced apart by a distance corresponding to the outer diameter of the cam 3 (the outer diameter of the base of the cam 3 in the garden excluding the protruding portion) Of the measuring link 250 abuts against the outer surface of the cam 3 while receiving the cam 3 therebetween.

The gap between the cam 3 and the valve 4 is measured in a state in which the cam 3 to be measured is always rotated to the correct position by the contact of the both measurement links 250 to the outer surface of the cam 3 And the position of the cam 3 at this time means that the projecting portion of the cam 3 is located in the upper portion of the inside of the measurement link 250 and the inner side of the measurement link 250 is located at the base of the cam 3 And the outer side surface can be contacted.

On the other hand, such a position of the cam 3 as described above can be automatically performed by controlling a rotation angle of the driving motor 120 by a controller (not shown).

The operation of the valve gap measuring apparatus according to the present invention will now be described.

First, the cylinder head 1 is mounted on the upper surface of the base 110, and the camshaft 2 is connected to the driving motor 120 of the base 110.

In this state, the driving motor 120 is operated to rotate the camshaft 2 so that the protruding portion of the cam 3 to be measured is directed upward, and the cam 3 is provided at a predetermined position.

Thereafter, the moving block 150 is moved on the fixed block 140 to position the measuring unit on the upper side of the cam 3 to be measured. Then, the first cylinder 151 is operated to move the piston rod 152 to the first And is drawn into the cylinder 151.

In this process, both of the actuating links 180 on the fixing plate 170 are moved in the direction of approaching each other, and the engaging pins 211 of the grippers 210 are pulled in directions opposite to each other, And the measuring arm 220 under the gripper 210 is disposed in an open state.

The first lift block 160 fixed to the piston rod 152 is guided on the moving block 150 by the guider 161 and the guide rail 153 to be stably lowered.

The fixing plate 170 is also lowered along with the lowering first lift block 160. The second lift block 200 provided on the fixing plate 170 and the gripper 210 and the measuring arm 220, (250) also descends toward the cam (3) side to be measured.

Then, as shown in Fig. 8, the lower end of the both measurement links 250 starts to contact the outer surface of the cam 3 while the cam 3 is inserted between the descending opposite measurement links 250. [

At this time, the operation link 180 having the grippers 210 opened to both sides is returned to its original state, and at the same time, the compressive force of the elastic members 230 stretched between the grippers 210 acts on the both grippers 210, The measuring arm 220 is pinched so that the both measuring ball tips 221 provided at the ends of the both measuring arms 220 are in contact with the outer surface of the cam 3. [

The second lift block 200 descending in this state is stably guided in a state of being restrained by the guide groove 171 by the support plate 177 provided on the fixing plate 170 and is lowered.

The second lifting block 200 is fixed to the fixing plate 170 by being inserted into the seating groove 172 of the guide groove 171 and seated The measurement arm 220 and the measurement link 250 are also lowered as shown in the second lift block 200 in the second lift block 200.

Particularly, the measuring arm 220 descended by the second lifting block 200 is moved in the direction of the outer surface of the cam 3 by the elastic member 230 provided between the grippers 210, as shown in FIG. The two measuring ball tips 221 are held in contact with the outer surface of the cam 3 by the elastic member 230 along the outer surface of the cam 3 And inserted into the gap between the cam 3 and the valve 4 while being lowered.

In this state, the fixing plate 170 is further lowered by 5 mm to stop. The fixing plate 170 is further lowered by 5 mm so that the fixing pins 202 and 203 of the second lifting block 200 are released to the upper and lower through portions 173 and 175 to be in a free state The ball tip 221 is provided in an abutted state in which an external force is not applied to the outer surface of the cam 3 and the upper surface of the tappet 5 of the valve 4 to accurately measure the gap between the valve 4 and the cam 3 So that it can be precisely measured.

The measurement method by the valve gap measuring apparatus 100 provided as described above can be obtained by the following equation.

In Equation (1) above,

VC: Valve clearance

A: The radius of the cam base (excluding the projecting portion of the cam) (fixed value)

B: Radius of measurement ball tip (fixed value)

C: Distance between measuring ball tip center points

Lt; / RTI >

Here, the distance between the center points of the measurement ball tip 221 can be obtained by the measurement sensor 240.

As described above, when the measurement of the valve clearance is completed, the first cylinder 151 is operated to raise the lowered second lift block 200 again, and the gripper 210 of the second lift block 200 And the measurement arm 220 and the measurement link 250 are integrally lifted together with the second lift block 200. [

The measuring arm 220 thus raised is actuated in the direction in which the actuating links 180 are opposed to each other so as to further open both grippers 210 outwardly so that the both measuring ball tips 221 are moved to the outside of the cam 3 The first cylinder 151 raises the first lift block 160 to completely separate the measurement unit from the upper portion of the camshaft 2 and separate the measurement unit.

Thereafter, the moving block 150 is moved forward or backward on the fixed block 140 to position the measuring unit on the upper side of the cam 3 to be measured. Then, the cam 3 is moved in the above- And the valve (4).

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the same is by way of illustration and example only and is not to be construed as limiting the present invention. It is obvious that the modification or improvement is possible.

It is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

1: Cylinder head 2: Cam shaft
3: Cam 4: Valve
5: Tappet 6: Gauge
100: Measuring device 110: Base
120: drive motor 130: support bracket
140: fixed block 150: moving block
151: first cylinder 152: piston rod
153: guide rail 160: first lift block
161: guider 170: fixed plate
170a: extension part 171: guide groove
172: seat groove 173: upper penetrating portion
174: Fixing hole 175: Lower through-
176: Fixing hole 177: Support plate
180: Actuation link 190: Second cylinder
200: second lift block 201: engaging projection
202, 203: fixing pin 204: hinge projection
210: gripper 211: engaging pin
212: hinge part 220: measuring arm
221: Measuring ball tip 230: Elastic member
240: measurement sensor 250: measurement link

Claims (5)

A valve gap measuring device for measuring a gap between a cam and a valve of a cylinder head,
A first lift block having a through hole penetrating the upper and lower sides thereof and a lower hole extending downward from the through hole and having a diameter smaller than that of the through hole;
A second lifting block provided on the first lifting block and being movable in the same direction as the first lifting block, and having a fixing pin that flows at a through portion of the first lifting block and is fixedly coupled to the fixing hole,
A plurality of grippers rotatably coupled to the second lift block at respective central portions thereof;
A plurality of measuring arms provided on both grippers to surround the outer surface of the cam;
A measurement ball tip formed on each of the two measurement arms and inserted into a gap between the cam and the valve; And
A measurement sensor for measuring a distance between both grippers which are respectively provided in both grippers and are rotated;
A measurement link provided in the second lift block for receiving the cam to be measured therein so that the cam is provided at a predetermined position;
And a drive motor that automatically and reversely rotates the cam shaft provided with the cam to allow the cam to be positively received in the both measurement links,
The first and second lift blocks are further lowered after the measurement ball tip of the both spheres is inserted into the gap between the cam and the valve so that the fixing pin of the second lift block is positioned at the through portion of the first lift block, Of the valve.
The method according to claim 1,
Wherein the first lift block is provided with a guide groove for guiding the movement of the second lift block and a support plate for restricting the second lift block in a movable state in the guide groove.
The method of claim 2,
Wherein the second lift block is formed with an outwardly projecting engagement portion and the guide groove of the first lift block includes a seating groove in which a coupling protrusion of the second lift block is inserted and fixed.
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