CN114199111A - Engine timing angle measuring instrument and measuring method - Google Patents
Engine timing angle measuring instrument and measuring method Download PDFInfo
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- CN114199111A CN114199111A CN202010978513.5A CN202010978513A CN114199111A CN 114199111 A CN114199111 A CN 114199111A CN 202010978513 A CN202010978513 A CN 202010978513A CN 114199111 A CN114199111 A CN 114199111A
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- angle
- measuring
- engine
- camshaft
- timing
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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
- G01B5/24—Measuring arrangements characterised by the use of mechanical techniques for measuring angles or tapers; for testing the alignment of axes
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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
- G01B5/003—Measuring of motor parts
- G01B5/0032—Valves, actuating devices for valves
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- General Physics & Mathematics (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
The invention provides an engine timing angle measuring instrument and a measuring method. The angle measuring instrument comprises a connecting plate, a first measuring column, a second measuring column, a first angle disc and a second angle disc. The connecting plate is provided with a first mounting hole and a second mounting hole which are respectively concentric with an air inlet camshaft and an exhaust camshaft of the engine, and the connecting plate is fixedly connected with the engine. The first measuring column is rotatably arranged in the first mounting hole, and the second measuring column is rotatably arranged in the second mounting hole; the front end face of the first measuring column is provided with a first boss, and the front end face of the second measuring column is provided with a second boss; the first boss is used for being clamped into the two opposite eccentric grooves at the tail end of the air inlet camshaft, and the second boss is used for being clamped into the two opposite eccentric grooves at the tail end of the air exhaust camshaft. The angle scale is fixedly connected with the measuring column. The timing angle measuring instrument and the measuring method can accurately measure the timing deviation angle and quantify the deviation amount of the intake and exhaust camshafts respectively.
Description
Technical Field
The invention relates to the technical field of engines, in particular to an engine timing angle measuring instrument and a measuring method.
Background
In both engine manufacturing and after-market maintenance of automobiles, inspection of the timing system is involved. The currently widely adopted method is as follows: the special tool assistor is arranged at the positioning point of the intake camshaft and the exhaust camshaft, if the assistor can be assembled in place, the correct assembly of the timing system is proved, and otherwise, the error of the timing system is proved.
In actual operation, after the timing system is assembled, the timing angle formed by the intake camshaft and the exhaust camshaft has a certain error range, and the traditional checking method cannot identify all states in the error range. The following problems are specifically present: only qualitative judgment can be made on the correctness of the timing system, and quantitative evaluation cannot be performed; the respective deviation amounts of the intake and exhaust camshafts cannot be determined.
In view of the above technical problems, the present inventors have long studied and practiced the present invention.
Disclosure of Invention
In order to solve the above-mentioned problems, the present invention provides an engine timing angle measuring instrument and a measuring method thereof, which can accurately measure a timing deviation angle and quantify the deviation amount of each intake and exhaust camshaft when an engine is checked for timing.
The technical scheme adopted by the invention is as follows:
on one hand, the engine timing angle measuring instrument comprises a connecting plate, a first measuring column, a second measuring column, a first angle disc and a second angle disc;
the connecting plate is provided with a first mounting hole and a second mounting hole which are respectively concentric with an air inlet camshaft and an exhaust camshaft of the engine, and the connecting plate is fixedly connected with the engine;
the first measuring column is rotatably arranged in the first mounting hole, and the second measuring column is rotatably arranged in the second mounting hole; a first boss is arranged on the front end face of the first measuring column, and a second boss is arranged on the front end face of the second measuring column; the first boss is used for being clamped into the two opposite eccentric grooves at the tail end of the air inlet camshaft, and the second boss is used for being clamped into the two opposite eccentric grooves at the tail end of the air exhaust camshaft;
the first angle scale and the second angle scale are respectively and fixedly connected with the first measuring column and the second measuring column and used for measuring the timing angle of the engine.
Furthermore, a timing angle datum line is arranged on the connecting plate, and angle scales are arranged on the first angle scale and the second angle scale.
Furthermore, a first positioning hole and a second positioning hole are respectively arranged on the first angle scale and the second angle scale, and a first pin hole and a second pin hole are respectively arranged on the first measuring column and the second measuring column; and the first positioning pin penetrates through the first positioning hole and the first pin hole to fixedly connect the first angle scale with the first measuring column, and the second positioning pin penetrates through the second positioning hole and the second pin hole to fixedly connect the second angle scale with the second measuring column.
Furthermore, according to the positions of the camshaft of engines of different models, a plurality of first pin holes and a plurality of second pin holes in different positions are correspondingly formed in the first measuring column and the second measuring column respectively.
Furthermore, arc-shaped guide grooves are respectively formed in the first angle disc and the second angle disc, a positioning screw penetrates through the arc-shaped guide grooves and is fixed to the connecting plate, the first angle disc and the second angle disc are fixed relative to the connecting plate in the axial direction, the first angle disc and the second angle disc can rotate relative to the connecting plate, and the positioning screw moves relative to the arc-shaped guide grooves during rotation.
Further, the angle scales on the first angle scale and the second angle scale comprise a positive scale area and a negative scale area according to the deviation direction of the camshaft.
Further, the connecting plate is fixed to a head cover of the engine by bolts.
Furthermore, a rotating handle is respectively fixed on the rear end surfaces of the first measuring column and the second measuring column.
In another aspect, an engine timing angle measurement method is provided:
selecting corresponding pin holes on the measuring columns according to the model of the engine, and fixedly connecting the two angle scales with the two measuring columns respectively through positioning pins;
respectively clamping bosses on the front end surfaces of the two measuring columns into two opposite eccentric grooves at the tail ends of the intake camshaft and the exhaust camshaft, and fixedly connecting a connecting plate with the engine;
and reading the scale value on the angle scale correspondingly indicated by the timing angle datum line on the connecting plate.
Further, when the timing angle reference line indicates the 0-degree scribed line positions of the two angle scales, the engine timing angle is standard;
when the camshaft deviation angle is clockwise, the read angle is a positive value, otherwise, the read angle is a negative value.
When the crankshaft of the engine is adjusted to the timing checking position, the horizontal eccentric grooves at the tail ends of the intake camshaft and the exhaust camshaft are theoretically positioned on the same plane, the planes of the vertical eccentric grooves are theoretically parallel to each other, and if the timing angle has deviation, the eccentric grooves and the theoretical position form a certain angle. The invention utilizes the principle that two measuring columns are positioned in an eccentric groove, and when the air inlet and the air outlet are positioned at theoretical positions, 0-degree scribed lines on two angle scales on the measuring columns are flush with a datum line on a connecting plate. When the intake camshaft and the exhaust camshaft deviate from the theoretical positions, the deviation angles of the intake camshaft and the exhaust camshaft are reflected to the measuring columns connected with the intake camshaft, and the deviation angles of the measuring columns can be accurately read through the angle scales connected with the measuring columns.
On one hand, accurate measurement of the timing deviation angle is achieved, the timing can be judged to be qualified in the error range of the measurement result, and otherwise, the timing is judged to be out of tolerance. On the other hand, by accurately measuring the deviation amount of the intake camshaft and the exhaust camshaft, the rule and the trend of the timing deviation can be counted, and the method is used for improving the assembly process of the timing system and analyzing the failure reason of the timing system.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is an exploded view showing the construction of an engine timing angle measuring instrument according to an embodiment of the present invention;
FIG. 2 is a schematic view showing the assembly of an engine timing angle measuring instrument according to an embodiment of the present invention;
fig. 3 shows a structural change of the engine timing angle measuring instrument according to the embodiment of the present invention when it measures for different types of engines.
Detailed Description
The above and further features and advantages of the present invention are described in more detail below with reference to the accompanying drawings.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description of the present invention, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Fig. 1 shows an exploded view of the structure of an engine timing angle measuring instrument of an embodiment of the present invention, and fig. 2 shows an assembly schematic view of the engine timing angle measuring instrument of the embodiment of the present invention. The engine timing angle measuring instrument is installed at the tail ends of an air inlet camshaft 200 and an exhaust camshaft 300 of the engine. When the engine crankshaft is adjusted to the timing standard position, theoretically, the horizontal eccentric grooves 201, 201 'at the end of the intake camshaft 200 and the horizontal eccentric grooves 301, 301' at the end of the exhaust camshaft 300 are in the same plane; the planes in which the vertical eccentric grooves 202, 202 'of the end of the intake camshaft 200 and the vertical eccentric grooves 302, 302' of the end of the exhaust camshaft 300 are located are parallel to each other, and if there is a deviation in timing angle, the eccentric grooves form an angle with the theoretical position.
Referring to fig. 1 and 2, in the present embodiment, the engine timing angle measuring instrument includes a connection plate 1, a first measuring post 2, a second measuring post 3, a first angle dial 4, and a second angle dial 5. The front end face of the first measuring column 2 is provided with a first boss 21, and the first boss 21 is clamped into two horizontal eccentric grooves 201 and 201' at the tail end of the air inlet camshaft 200. The front end face of the second measuring column 3 is provided with a second boss 31, and the second boss 31 is clamped into two horizontal eccentric grooves 301 and 301' at the tail end of the exhaust camshaft 300. It should be noted that the first boss 21 and the second boss 31 are in clearance fit with the corresponding eccentric grooves, but the smaller the clearance, the better the clearance, and the smaller the clearance, the more accurately the first measuring cylinder 2 and the second measuring cylinder 3 reflect the angular positions of the intake camshaft 200 and the exhaust camshaft 300.
It is understood that, since the positions of the eccentric grooves on the intake camshaft 200 and the exhaust camshaft 300 are fixed, the first measuring cylinder 2 and the second measuring cylinder 3 are connected to the intake camshaft 200 and the exhaust camshaft 300 to reflect the angular positions of the camshafts, and the first boss 21 and the second boss 31 may also be respectively matched with the two vertical eccentric grooves 202, 202 'at the end of the intake camshaft 200 and the two vertical eccentric grooves 302, 302' at the end of the exhaust camshaft 300. Or the first boss 21 is fitted with the two horizontal eccentric grooves 201, 201 'of the end of the intake camshaft 200 and the second boss 31 is fitted with the two vertical eccentric grooves 302, 302' of the end of the exhaust camshaft 300. Or the first boss 21 is fitted with the two vertical eccentric grooves 202, 202 'at the end of the intake camshaft 200 and the second boss 31 is fitted with the two horizontal eccentric grooves 301, 301' at the end of the exhaust camshaft 300. Still alternatively, the first boss 21 and the second boss 31 are respectively cross-shaped and are respectively matched with four eccentric grooves at the end of the corresponding camshaft.
The connecting plate 1 is provided with a first mounting hole 11 and a second mounting hole 12 which are respectively concentric with an intake camshaft 200 and an exhaust camshaft 300 of an engine. The first measuring cylinder 2 is rotatably mounted in the first mounting hole 11 and the second measuring cylinder 3 is rotatably mounted in the second mounting hole 12. Preferably, the first measuring cylinder 2 and the second measuring cylinder 3 are cylindrical. The connecting plate 1 is provided with a fixing hole 13, and the connecting plate 1 is fixed on a cylinder cover shell of an engine through the fixing hole 13 by a bolt.
The first angle scale 4 and the second angle scale 5 are respectively provided with a first positioning hole 43 and a second positioning hole 53. The first measuring column 2 and the second measuring column 3 are respectively provided with a first pin hole 22 and a second pin hole 32. The first positioning pin 9 passes through the first positioning hole 43 and the first pin hole 22 to fixedly connect the first angle scale 4 with the first measuring column 2, and the second positioning pin 10 passes through the second positioning hole 53 and the second pin hole 32 to fixedly connect the second angle scale 5 with the second measuring column 3. The first angle scale 4 and the second angle scale 5 are provided with angle scales 41 and 51, respectively. The first angle scale 4 and the second angle scale 5 are respectively provided with arc-shaped guide grooves 42 and 52, the positioning screw 8 penetrates through the arc-shaped guide grooves 42 and 52 to be fixed on the connecting plate 1, so that the first angle scale 4 and the second angle scale 5 are fixed relative to the axial position of the connecting plate 1, the first angle scale 4 and the second angle scale 5 can rotate relative to the connecting plate 1, and the positioning screw 8 moves relative to the arc-shaped guide grooves 42 and 52 when the positioning screw rotates. According to the angular positions of the first measuring column 2 and the second measuring column 3, a timing angle reference line 15 is arranged on the connecting plate and used for being matched with the angle scales 41 and 51 to indicate the engine timing angle to be measured. The angle scales on the first angle scale 4 and the second angle scale 5 comprise a positive value scale area and a negative value scale area which are marked with +/-numbers correspondingly. The timing angle reference line 15 indicates the engine timing angle standard when the 0 ° scribed line positions of the two angle scales. When the camshaft deviation angle is clockwise, the read angle is a positive value, otherwise, the read angle is a negative value.
In order to facilitate installation and adjustment of the measuring instrument, the rear end faces of the first measuring column 2 and the second measuring column 3 are respectively fixed with a rotating handle 6 through a fixing bolt 7.
In a specific example, as shown in fig. 1, the first angle plate 4 and the second angle plate 5 are respectively provided with a fixing ring for cooperating with the first measuring column 2 and the second measuring column 3. First locating hole 43, second locating hole 53 locate on this solid fixed ring, and first locating hole 43, second locating hole 53 are two, and coaxial setting respectively is located solid fixed ring's outer peripheral face, and first pinhole 22, second pinhole 32 are the through-hole, and the locating pin passes solid fixed ring and the middle measuring post of solid fixed ring to guarantee the position accuracy between angle scale and the measuring post. One side of the fixed ring is connected with a sector dial, and the sector dial is provided with angle scales 41 and 51 and arc-shaped guide grooves 42 and 52. The sector dial is positioned between the two fixed rings.
As shown in fig. 1 and 3, in one example, a plurality of first pin holes 22 and a plurality of second pin holes 32 are respectively and correspondingly arranged on the first measuring column 2 and the second measuring column 3 according to the camshaft positions of engines of different models. The first positioning hole 43 and the second positioning hole 53 on the first angle scale 4 and the second angle scale 5 are combined and connected with the different first pin hole 22 and second pin hole 32, so that the axial positions of the first measuring column 2 and the second measuring column 3 relative to the connecting plate 1 can be changed, and the engine timing angle measuring instrument is matched with engines of different models.
When the engine timing angle measuring instrument is used for measuring, the corresponding pin holes on the measuring columns are selected according to the model of the engine, and the two angle scales are respectively and fixedly connected with the two measuring columns through the positioning pins. The two measuring columns are in a free rotation state, when the boss at the front end is matched and assembled with the eccentric groove at the tail end of the camshaft in place, the connecting plate and the cylinder cover shell are fixed through the bolt, and the measuring instrument realizes three-point fixation through the two measuring columns and the bolt. When the air inlet and the air outlet are positioned at theoretical positions, the timing angle datum line indicates the 0-degree scribed line positions of the two angle scales, and the engine timing angle is standard. When the intake camshaft and the exhaust camshaft deviate from the theoretical positions, the deviation angles of the intake camshaft and the exhaust camshaft are reflected to the measuring columns connected with the intake camshaft, and the deviation angles of the measuring columns can be accurately read through the angle scales connected with the measuring columns. When the camshaft deviation angle is clockwise, the read angle is a positive value, and the negative value is negative.
The foregoing is merely a preferred embodiment of this invention, which is intended to be illustrative, and not limiting. The structure, the connection mode and the like of all the components in the invention can be changed, and the equivalent transformation and the improvement on the basis of the technical scheme of the invention are not excluded from the protection scope of the invention.
Claims (10)
1. An engine timing angle measuring instrument is characterized by comprising a connecting plate, a first measuring column, a second measuring column, a first angle disc and a second angle disc;
the connecting plate is provided with a first mounting hole and a second mounting hole which are respectively concentric with an air inlet camshaft and an exhaust camshaft of the engine, and the connecting plate is fixedly connected with the engine;
the first measuring column is rotatably arranged in the first mounting hole, and the second measuring column is rotatably arranged in the second mounting hole; a first boss is arranged on the front end face of the first measuring column, and a second boss is arranged on the front end face of the second measuring column; the first boss is used for being clamped into the two opposite eccentric grooves at the tail end of the air inlet camshaft, and the second boss is used for being clamped into the two opposite eccentric grooves at the tail end of the air exhaust camshaft;
the first angle scale and the second angle scale are respectively and fixedly connected with the first measuring column and the second measuring column and used for measuring the timing angle of the engine.
2. The engine timing angle measuring instrument as claimed in claim 1, wherein said connecting plate is provided with a timing angle reference line, and said first angle plate and said second angle plate are provided with angle scales.
3. The engine timing angle measuring instrument according to claim 2, wherein said first angle plate and said second angle plate are provided with a first positioning hole and a second positioning hole, respectively, and said first measuring post and said second measuring post are provided with a first pin hole and a second pin hole, respectively; and the first positioning pin penetrates through the first positioning hole and the first pin hole to fixedly connect the first angle scale with the first measuring column, and the second positioning pin penetrates through the second positioning hole and the second pin hole to fixedly connect the second angle scale with the second measuring column.
4. The engine timing angle measuring instrument according to claim 3, wherein a plurality of first pin holes and a plurality of second pin holes are respectively formed in the first measuring column and the second measuring column at different positions according to the positions of the camshaft of the engine of different models.
5. The engine timing angle measuring instrument as claimed in claim 2, wherein said first angle plate and said second angle plate are provided with arc-shaped guide grooves, respectively, through which a set screw is fixed to said attachment plate so that said first angle plate and said second angle plate are fixed in axial position with respect to said attachment plate, said first angle plate and said second angle plate being rotatable with respect to said attachment plate, said set screw being moved with respect to said arc-shaped guide grooves when rotated.
6. An engine timing angle measuring instrument as set forth in claim 2, wherein the angle graduations on said first angle scale and said second angle scale include positive value graduations and negative value graduations depending on a direction of camshaft misalignment.
7. The engine timing angle measuring instrument as claimed in claim 1, wherein said connecting plate is fixed to a head cover of the engine by bolts.
8. The engine timing angle measuring instrument as claimed in any one of claims 1 to 7, wherein a rotating handle is fixed to rear end faces of said first measuring cylinder and said second measuring cylinder, respectively.
9. A method for measuring the timing angle of an engine,
selecting corresponding pin holes on the measuring columns according to the model of the engine, and fixedly connecting the two angle scales with the two measuring columns respectively through positioning pins;
respectively clamping bosses on the front end surfaces of the two measuring columns into two opposite eccentric grooves at the tail ends of the intake camshaft and the exhaust camshaft, and fixedly connecting a connecting plate with the engine;
and reading the scale value on the angle scale correspondingly indicated by the timing angle datum line on the connecting plate.
10. The engine timing angle measuring method according to claim 9,
when the timing angle datum line indicates the 0-degree scribed line positions of the two angle scales, the engine timing angle is standard;
when the camshaft deviation angle is clockwise, the read angle is a positive value, otherwise, the read angle is a negative value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010978513.5A CN114199111A (en) | 2020-09-17 | 2020-09-17 | Engine timing angle measuring instrument and measuring method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010978513.5A CN114199111A (en) | 2020-09-17 | 2020-09-17 | Engine timing angle measuring instrument and measuring method |
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| Publication Number | Publication Date |
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| CN114199111A true CN114199111A (en) | 2022-03-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010978513.5A Pending CN114199111A (en) | 2020-09-17 | 2020-09-17 | Engine timing angle measuring instrument and measuring method |
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| CN (1) | CN114199111A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114770420A (en) * | 2022-04-20 | 2022-07-22 | 淄柴机器有限公司 | Device for adjusting timing cam of camshaft |
| CN115635294A (en) * | 2022-12-23 | 2023-01-24 | 潍柴动力股份有限公司 | Auxiliary assembly device of transmission shaft of fuel injection pump |
-
2020
- 2020-09-17 CN CN202010978513.5A patent/CN114199111A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114770420A (en) * | 2022-04-20 | 2022-07-22 | 淄柴机器有限公司 | Device for adjusting timing cam of camshaft |
| CN115635294A (en) * | 2022-12-23 | 2023-01-24 | 潍柴动力股份有限公司 | Auxiliary assembly device of transmission shaft of fuel injection pump |
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