KR20170073807A - Cam lift measuring device - Google Patents

Cam lift measuring device Download PDF

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Publication number
KR20170073807A
KR20170073807A KR1020150181943A KR20150181943A KR20170073807A KR 20170073807 A KR20170073807 A KR 20170073807A KR 1020150181943 A KR1020150181943 A KR 1020150181943A KR 20150181943 A KR20150181943 A KR 20150181943A KR 20170073807 A KR20170073807 A KR 20170073807A
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KR
South Korea
Prior art keywords
cam
camshaft
center
cam lift
base circle
Prior art date
Application number
KR1020150181943A
Other languages
Korean (ko)
Inventor
안윤수
한승용
Original Assignee
현대중공업 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 현대중공업 주식회사 filed Critical 현대중공업 주식회사
Priority to KR1020150181943A priority Critical patent/KR20170073807A/en
Publication of KR20170073807A publication Critical patent/KR20170073807A/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
    • G01B5/0025—Measuring of vehicle parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B3/00—Measuring instruments characterised by the use of mechanical techniques
    • G01B3/22—Feeler-pin gauges, e.g. dial gauges
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
    • G01B5/0002—Arrangements for supporting, fixing or guiding the measuring instrument or the object to be measured
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2800/00—Methods of operation using a variable valve timing mechanism
    • F01L2800/11—Fault detection, diagnosis

Abstract

The present invention relates to a cam lift measurement device, and more particularly, to a cam lift measurement device capable of measuring a cam lift on the basis of an intake cam of an engine.
To this end, there is provided a cam lift measurement apparatus for measuring a cam lift using a cam of a camshaft, the cam lift measurement apparatus comprising: a cam follower provided on an upper and lower outer circumferential surfaces of a base circle of the cam shaft, Center corrector; A guide portion which is fastened to the center correcting portion and which is guided by the operation of the center correcting portion and whose central portion is located at the center point of the base circle of the camshaft; A meter installed on one side of the guide and measuring a cam lift through a cam nose height difference of the cam when the cam shaft rotates; And a support vertically disposed on the other side of the guide portion and fixed to one side of the engine block to support the guide portion.

Description

&Quot; Cam lift measuring device "

The present invention relates to a cam lift measurement device, and more particularly, to a cam lift measurement device capable of measuring a cam lift on the basis of an intake cam of an engine.

Generally, in manufacturing an engine, a cam assembly state is checked after assembling a camshaft and a timing gear to check the combustion pressure and confirm alignment of the timing gear.

That is, when an error occurs in assembling the camshaft, the alignment of the camshaft and the engaged timing gear is disrupted, and the engine is operated with an incomplete stroke.

Therefore, it is essential to check the correct assembly of the camshaft and, if necessary, to confirm the assembly of the camshaft by a correction operation.

In this way, it is possible to prevent an accident caused by the interference between the piston and the valve occurring during engine operation by checking the cam assembly state in advance.

On the other hand, as a method for checking the assembled state of the camshaft, the height difference of the cam nose when the camshaft rotates, that is, the cam lift is measured to determine the accuracy of the camshaft assembly.

1 is a view showing a state in which a conventional cam lift is measured.

As shown in the drawings, a cam lift measurement operation has been performed in a manner where the fuel pump 4 is installed in a manner that conventionally measures the cam lift of the fulcam 1 of the camshaft.

This is a method in which the fuel pump 4 is first removed and a dial gauge 5 is provided to measure the cam nose height difference of the fuel cam 1 through the dial gauge 5. [

That is, the roller 2 is disposed so as to be in contact with the cam nose of the differential cam 1, and the roller guide 3 for allowing the roller 2 to move up and down is located on the roller 2, The dial gauge 5 is installed at the position where the measuring instrument 6 is removed and the cam nose pushes the roller 2 upward when the focal cam 1 rotates, And the cam lift is measured by measuring through the dial gauge 5 as much as the clearance.

However, in the conventional cam lift measurement method as described above, it is necessary to remove the fuel pump 4 to measure the cam lift, and also it is necessary to use a gas engine or a common rail, It is difficult to set the reference point while the dial gauge 5 is fixed in the fixed position because the fuel cam 1 is not present. As a result, it is difficult to measure the cam lift in the cam shaft in which the fuel cam 1 does not exist there is a problem.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a cam lift measuring device capable of accurately measuring a cam lift of a camshaft through an intake cam in a gas engine and a common rail type engine in which no fuel cam is present, The purpose is to provide.

According to an aspect of the present invention, there is provided a cam lift measurement device for measuring a cam lift using a cam of a cam shaft, the cam lift measurement device being provided to be supported by upper and lower outer circumferential surfaces of a base circle of the cam shaft A center correcting unit that can be positioned at the center of the camshaft axis; A guide portion which is fastened to the center correcting portion and which is guided by the operation of the center correcting portion and whose central portion is located at the center point of the base circle of the camshaft; A meter installed on one side of the guide and measuring a cam lift through a cam nose height difference of the cam when the cam shaft rotates; And a support vertically disposed on the other side of the guide portion and fixed to one side of the engine block to support the guide portion.

In this case, the center correcting unit may include: an upper member supported on an upper surface of an outer circumference of a base circle of the camshaft; A lower member supported at a lower portion of an outer circumferential surface of a base circle of the camshaft; And a rotating member disposed between the upper member and the lower member to adjust the gap between the upper member and the lower member.

The upper member is provided with an upper screw rod having a left screw mountain formed therein. The lower member is formed with a lower screw rod having a right screw thread. The rotary member has a first screw groove formed in the upper side thereof with a left- The upper screw and the lower screw are fastened to the upper portion and the lower portion with respect to the rotary member, respectively. When the rotary member is rotated, the upper and lower members And at the same time, the interval is narrowed or distanced while vertically moving in different directions.

In the meantime, the guide part is formed with a latching groove to be engaged with and interlocked with the center correcting part.

The cam lift measuring apparatus according to the present invention as described above has the following effects.

When the rotary member is operated in a state in which the upper member and the lower member of the center correcting unit are supported on the upper and lower portions of the cam shaft base circle, the guide portion can be vertically moved in conjunction with the rotary member and accurately positioned at the center point of the cam shaft base circle So that the measurer of the measuring instrument in contact with the cam nose can be positioned at the center point of the base circle.

In addition, the stationary state can be maintained stably by bolting the fixing portion of the support to the cover bolt hole formed in the cam window of the engine block.

Accordingly, it is possible to measure an accurate cam lift in a fixed state with respect to the axial center point of the camshaft by using a cam of an intake cam, an exhaust cam, a fuel cam, or the like.

1 is a view showing a state in which a conventional cam lift is measured.
2 is a perspective view of a cam lift measuring apparatus according to the present invention.
3 is a side view of the cam lift measuring device according to the present invention.
4 is a front view of the installation state of the cam lift measuring device according to the present invention.
5 is a perspective view of the cam lift measurement apparatus according to the present invention.

The terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary meanings and the inventor may properly define the concept of the term to describe its invention in the best possible way And should be construed in accordance with the principles and meanings and concepts consistent with the technical idea of the present invention.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to FIGS. 2 to 5 attached hereto.

Fig. 2 is a perspective view of the cam lift measuring apparatus according to the present invention, Fig. 3 is a side view of the cam lift measuring apparatus according to the present invention, Fig. 4 is a front view of the cam lift measuring apparatus according to the present invention, Fig. 3 is a perspective view of the cam lift measurement device according to the first embodiment of the present invention;

The cam lift measurement apparatus 100 according to the present invention mainly includes a center correction unit 110, a guide unit 120, a meter 130, and a support 140.

The cam lift measurement apparatus 100 according to the present invention enables an accurate cam lift measurement of the camshaft through the intake cam in an engine in which the gas engine and the common rail type fuel cam are not present.

Here, the present invention is not limited to the above-described intake cam, but it is also possible to measure the cam lift while being supported by the cam through the exhaust cam and the fuel cam. In addition to the method of fixing the instrument by detaching the fuel pump, Cam is also possible.

Therefore, the intake cam, which will be described below, refers to the intake cam as an example of the cam of the camshaft, and does not limit the intake cam alone.

First, the center correction unit 110 is a portion for correcting the position so that the measuring instrument 130, which will be described later, can be positioned at the center of the camshaft 20 axis.

The center correcting unit 110 is installed to be supported on the upper and lower outer circumferential surfaces of the base circle 21 of the camshaft 20.

The center correcting unit 110 corrects the position of the measuring unit 130 based on the axis center of the camshaft 20 to accurately measure the cam lift. In the camshaft 20, It is possible to arrange it on the axis center with reference to the base circle 21 formed as a garden without eccentricity.

And is mounted on the camshaft 20 so as to be supported by the base circle 21 adjacent to the intake cam 22. [

The center correcting unit 110 includes an upper member 111, a lower member 114, and a rotating member 117.

The upper member 111 is supported on the upper surface of the outer circumference of the base circle 21 of the camshaft 20 and the lower member 114 is supported below the outer circumference of the base circle 21 of the camshaft 20, The member 117 is disposed between the upper member 111 and the lower member 114 to control the gap between the upper member 111 and the lower member 114.

The upper member 111 is formed in a plate-like structure that is flat in the horizontal direction so as to be supported on the upper surface of the outer circumference of the base circle 21, and a top thread rod 112 having a left-

The upper member 111 is formed with a first guide hole 113 formed in a vertical direction so as to guide the guide member 120, which will be described later, by the upper member 111.

Accordingly, the upper member 111 may have a shape in which a portion of the upper member 111 coupled to the upper portion of the outer circumferential surface of the base circle 21 and the upper screw rod 112 are combined.

At this time, the first guide hole 113 may be formed inside the upper threaded rod 112, that is, the direction in which the camshaft 20 is positioned.

The lower member 114 is formed in a flat plate-like structure that is horizontally flat so as to be supported at the lower portion of the outer circumference of the base circle 21, and a lower screw rod 115 is formed on one side thereof with a right- .

A second guide hole 116 is formed in the lower member 114 so as to be vertically penetrated so that the guide member 120, which will be described later, can be guided by the lower member 114.

Accordingly, the lower member 114 may have a shape in which the lower thread bar 115 is coupled to a portion supported under the outer circumferential surface of the base circle 21, and the lower member 114 may have a shape of 'B'.

At this time, the second guide hole 116 may be formed inwardly of the lower screw shaft 115, that is, the direction in which the cam shaft 20 is positioned.

The rotating member 117 is installed between the upper member 111 and the lower member 114 to connect the upper member 111 and the lower member 114.

The rotary member 117 is formed with a first screw groove 117a having a left-hand thread mountain formed inside the upper side so as to be connected to the upper member 111 and the lower member 114, A groove 117b is formed.

That is, the rotary member 11 is formed in a cylindrical shape, and the upper screw thread 112 of the upper member 111 is screwed to the first screw thread groove 117a, The lower portion of the member 114 or the bar 115 is screwed.

The upper member 111 and the lower member 114 can be vertically moved at the same time in the vertical direction so that the gap can be narrowed or spaced apart and the base circle 21 of the camshaft 20 Of the outer circumferential surface and the lower surface of the outer circumferential surface.

On the other hand, a protrusion 118 is formed on the outer circumferential surface of the center of the rotary member 117 so as to partially protrude from the entire outer circumferential surface.

The protruding portion 118 is engaged with the engaging groove 122 of the guide portion 120 to be described later, and can be operated by interlocking with the guide portion 120.

As described above, the upper member 111, the lower member 114, and the rotating member 117 are combined in one configuration, and the upper member 111 and the lower member 114 are rotated by the operation of the rotating member 117, Can be narrowed or opened in the vertical direction.

The center portion of the guide portion 120 is guided by the operation of the rotary member 117 of the center correcting portion 110 so that the center portion of the guide portion 120 is connected to the base circle of the camshaft 20. [ (21).

The guide part 120 is fastened to the center correcting part 110.

The upper portion of the vertical member 121 is inserted into the first guide hole 113 of the upper member 111, Is inserted into the second guide hole (116) of the lower member (114).

A horizontal member 122 is formed at one side of the center of the vertical member 121 of the guide unit 120 and partially protruded to be perpendicular to the vertical member 121.

When the guide part 120 is viewed from the side, the guide part 120 may be formed in a shape of 'ㅓ' or 'a'.

The center portion of the vertical member 121 of the guide portion 120 is preferably formed with a locking groove 122 to be engaged with the protrusion 118 of the rotary member 117 of the center correcting unit 110 to be interlocked Do.

That is, the projecting portion 118 of the rotary member 117 is fastened to the engagement groove 122 and the vertical member 121 of the guide portion 120 is moved upward or downward according to the rotation operation of the rotary member 117 So that it can be vertically moved in conjunction with the rotary member 117.

This is for the purpose of allowing the measuring instrument 130 installed in the guide part 120 to be located at the center of the axis of the base circle 21 of the camshaft 20. [

Next, the measuring instrument 130 is a part for measuring the cam lift through the height difference of the cam nose 23 of the intake cam 22 when the camshaft 20 rotates.

The meter 130 is installed at the end of the horizontal member 122 of the guide unit 120.

The meter 130 is installed at the end of the horizontal member 122 connected to the vertical member 121 of the guide unit 120 so that the user can check the cam lift value.

The measuring instrument 130 is provided with a measurer 131 for measuring a height difference in contact with the cam nose 23 and the measurer 131 is built in an internal space provided with a guide in contact with the cam nose 23, The lift value can be confirmed.

Accordingly, the meter 130 is installed on the horizontal member 122 installed at the center of the guide part 120 so that the base 130 of the cam shaft 20 can be rotated by the operation of the rotating member 117 of the center correction part 110, The measurer 131 can be directed to the center of the circle 21 axis.

Next, the support 140 serves to fix the center correction unit 110, the guide unit 120, and the meter 130 in a combined state.

The support 140 is installed vertically on one side of the horizontal member 122 of the guide unit 120.

A fixing portion 141 for mounting the engine block 10 is provided on the support 140 and a long hole 142 is formed in the fixing portion 141.

A cover (not shown) is provided in the engine block 10 to prevent foreign substances from flowing into the cam window 11 formed for installing the camshaft 20. A cover bolt hole The fixing portion 141 of the supporter 140 is positioned by using the fixing bracket 12 and then fixed by bolting.

At this time, when the fixing portion 141 is fixed to the position of the cover bolt hole 12, the bolt is first temporarily fastened and when the adjustment of the center fixing portion 110 with respect to the camshaft 20 is completed, 141) to adjust the height thereof and fix it completely.

Hereinafter, the installation of the cam lift measurement apparatus and the cam lift measurement method described above with reference to Figs. 2 to 5 will be described.

The upper member 111 and the lower member 114 of the center correcting unit 110 are disposed adjacent to the upper and lower surfaces of the outer circumference of the base circle 21 of the camshaft 20, And temporarily bolts to the cover bolt hole 12 of the cover 10.

Then the inner surface of the upper member 111 and the upper member 111 and the lower member 114 are brought into close contact with the upper and lower surfaces of the outer circumferential surface of the base circle 21 of the camshaft 20 by rotating the rotary member 117 And the measurer 131 of the measuring instrument 130 is disposed so as to be in contact with the intake cam 22.

Then, when the measurer 131 of the measuring instrument 130 is located at the center of the axis of the base circle 21, the bolts of the fixing portion 141 are completely tightened and the fixing portion 141 is fixed to the engine block 10 .

When the operation of installing the cam lift measurement apparatus 100 is completed, the cam lift of the camshaft is measured.

That is, when the assembly of the camshaft 20 and the timing gear is completed, the cam lift measurement device 100 is installed as described above to measure the cam lift.

First, the camshaft 20 is rotated to check the displacement difference of the eccentric cam nose 23 in a state in which the measurer 131 of the measuring instrument 130 is closely attached to the intake cam 22.

At this time, the height difference of the cam nose 23 can be confirmed by checking the instruction change of the measuring instrument 130 according to the degree of movement of the measurer 131 based on the axial center of the intake cam 22, The cam lift value of the cam 22 can be measured.

The fixing portion 141 of the support 140 is separated from the engine block 10 and the cam shaft 20 is rotated by operating the rotating member 117. Then, The cam lift measurement apparatus 100 is separated and the operation of measuring the cam lift is completed.

As described above, when the upper member 111 and the lower member 114 of the center correcting unit 110 are supported on the upper and lower portions of the base circle 21 of the camshaft 20, the rotating member 117 is operated The guide portion 120 can be accurately positioned at the center of the base circle 21 of the camshaft 20 while vertically moving in conjunction with the rotary member 117. Thus, It is possible for the measurer 131 of the base circle 21 to be located at the center point of the base circle 21. [

The fixed portion 141 of the support 140 is bolted to the cover bolt hole 12 formed in the cam window 11 of the engine block 10 so that it can be stably fixed.

This makes it possible to measure the accurate cam lift in a fixed state with respect to the axial center point of the camshaft 20 by using the intake cam 22.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. .

10: engine block 11: cam window
12: Cover bolt hole 20: Cam shaft
21: base circle 22: intake cam
23: Cam nose 100: Cam lift measuring device
110: center corrector 111: upper member
112: upper screw rod 113: first guide hole
114: lower member 115: lower nail bar
116: second guide hole 117: rotating member
117a: first screw groove 117b: second screw groove
118: protruding portion 120: guide portion
121: vertical member 122: horizontal member
123: latching groove 130:
131: Measurer 140: Support
141: Fixed portion 142: Slot

Claims (4)

A cam lift measuring apparatus for measuring a cam lift using a cam of a camshaft,
A center correcting part installed to be supported on the upper and lower outer circumferential surfaces of the base circle of the camshaft and capable of being positioned at the center of the camshaft axis;
A guide portion which is fastened to the center correcting portion and which is guided by the operation of the center correcting portion and whose central portion is located at the center point of the base circle of the camshaft;
A meter installed on one side of the guide and measuring a cam lift through a cam nose height difference of the cam when the cam shaft rotates; And
And a support vertically disposed on the other side of the guide portion and fixed to one side of the engine block to support the guide portion. The method according to claim 1,
The center correcting unit
An upper member supported on an upper surface of an outer circumference of a base circle of the camshaft;
A lower member supported at a lower portion of an outer circumferential surface of a base circle of the camshaft; And
And a rotating member disposed between the upper member and the lower member for adjusting a distance between the upper member and the lower member. 3. The method of claim 2,
The upper member is formed with a top screw rod having a left-handed mountain,
Wherein the lower member is formed with a lower screw rod having a right screw thread,
Wherein the rotary member is provided with a first screw groove having an upper left side and a second screw groove formed with a lower right side screw thread,
The upper screw rod of the upper member is fastened to the upper portion with respect to the rotary member and the lower screw rod of the lower member is fastened to the lower portion and the upper member and the lower member are vertically moved simultaneously to narrow the gap, And the distance between the first and second cams increases. 4. The method according to any one of claims 1 to 3,
In the guide portion,
And a latching groove is formed to engage with and interlock with the center correcting unit.
KR1020150181943A 2015-12-18 2015-12-18 Cam lift measuring device KR20170073807A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020150181943A KR20170073807A (en) 2015-12-18 2015-12-18 Cam lift measuring device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020150181943A KR20170073807A (en) 2015-12-18 2015-12-18 Cam lift measuring device

Publications (1)

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KR20170073807A true KR20170073807A (en) 2017-06-29

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Family Applications (1)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108469215A (en) * 2018-06-13 2018-08-31 莱芜环球汽车零部件有限公司 The contrast detector of camshaft lift
CN110017744A (en) * 2019-03-26 2019-07-16 四川宁江山川机械有限责任公司 A kind of spring base weld size test measuring device and its detection method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108469215A (en) * 2018-06-13 2018-08-31 莱芜环球汽车零部件有限公司 The contrast detector of camshaft lift
CN110017744A (en) * 2019-03-26 2019-07-16 四川宁江山川机械有限责任公司 A kind of spring base weld size test measuring device and its detection method
CN110017744B (en) * 2019-03-26 2024-04-26 四川宁江山川机械有限责任公司 Measuring tool for welding size of spring seat and detecting method thereof

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