CN216348317U - Fast check tool for crankshaft flywheel positioning pin hole angle - Google Patents
Fast check tool for crankshaft flywheel positioning pin hole angle Download PDFInfo
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- CN216348317U CN216348317U CN202122480633.5U CN202122480633U CN216348317U CN 216348317 U CN216348317 U CN 216348317U CN 202122480633 U CN202122480633 U CN 202122480633U CN 216348317 U CN216348317 U CN 216348317U
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Abstract
The utility model discloses a quick detection tool for the angle of a positioning pin hole of a crankshaft flywheel, and mainly solves the problems that the existing detection tool is inconvenient to carry, long in detection time and high in requirement on the skill of an inspector. The quick detection tool comprises a detection tool base plate and three positioning plates arranged on the detection tool base plate; the three positioning plates are used for being respectively attached to the two main journals of the crankshaft and the excircle of the connecting rod journal, and the plane of the base plate of the checking fixture is determined by the three attachment points; the side surface of the checking fixture base plate is vertically connected with a positioning groove plate, and a reference hole groove is formed in the positioning groove plate. The rapid detection tool is small and exquisite, is convenient to carry and use, and can be used for detecting products rapidly, and the detection time of each product is about 10 seconds; whether the quality is qualified or not is directly judged by the checking fixture, calculation by an inspector is not needed, and the requirement on the skill of the inspector is not high. Therefore, the method is suitable for popularization and application.
Description
Technical Field
The utility model relates to a detection tool, in particular to a crankshaft flywheel positioning pin hole angle quick detection tool.
Background
The crankshaft mainly functions to bear the force transmitted by the connecting rod, and therefore generates a rotation moment around the axis of the crankshaft, and the moment is output outwards through the flywheel: in addition, the crankshaft is used to drive the engine's valve train and accessories such as a generator, a water pump, a steering pump, an air compressor, etc.
The angle of the crankshaft flywheel positioning pin hole is generally +/-15 degrees. A traditional meter printing mode needs to prepare a flat plate, a set of V-shaped block, a height gauge and a dial indicator, the checking fixture is not convenient to carry, and the checking step is complex, and the specific detection meter printing step is as follows:
(1) the diameters of the I main journal, the V main journal and the I connecting rod journal are respectively measured to be D1, D5 and D by a micrometer.
(2) Plugging a gauge plug gauge into a hole to be checked; the main journals of the crankshafts I and V are placed on the V-shaped supporting blocks and leveled with the axis. and a1 is the height of the leveling center, namely a2, otherwise, the screw rod in the figure 5 is adjusted until the leveling is finished.
(3) The crankshaft is rotated to push the dial indicator to the highest point of the I main journal, and then the dial indicator is pressed down according to [ (D1+ D5)/2-D ]/2. And finding the highest point of the connecting rod neck 1, and rotating the crankshaft to enable the plane formed by the connecting rod neck 1 and the main journals I and V to be parallel to the flat plate.
(4) And (4) pressing down the dial indicator according to h [ h ═ d/2- (R ═ sin alpha + phi/2) ] at the highest point of the connecting rod neck of the connecting rod 1. And moving the dial indicator to the highest point of the pin hole plug gauge, and recording the reading difference A of the two dial indicators. Note: r is the center distance of the pin holes, alpha is the included angle of the pin holes, and phi is the diameter of the pin holes.
(5) And (3) judging: a is less than or equal to R sin beta.
Thus, it can be seen that the inspection time is long, and about 1 minute is required to inspect 1 product. Whether the product is qualified can be judged only after calculation after the product is checked, and the requirement on the skill of an inspector is high.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a quick detection tool for the angle of a positioning pin hole of a crankshaft flywheel, and mainly solves the problems that the existing detection tool is inconvenient to carry, long in detection time and high in requirement on the skill of an inspector.
In order to achieve the purpose, the technical scheme adopted by the utility model is as follows:
a crankshaft flywheel positioning pin hole angle quick detection tool comprises a detection tool base plate and three positioning plates arranged on the detection tool base plate; the three positioning plates are used for being respectively attached to the two main journals of the crankshaft and the excircle of the connecting rod journal, and the plane of the base plate of the checking fixture is determined by the three attachment points; the side surface of the checking fixture base plate is vertically connected with a positioning groove plate, and a reference hole groove is formed in the positioning groove plate.
Further, in the utility model, the gauge base plate, the positioning plate and the positioning groove plate are integrally formed.
Further, in the utility model, the gauge base plate, the positioning plate and the positioning groove plate are made of aluminum alloy.
Compared with the prior art, the utility model has the following beneficial effects:
(1) the rapid checking fixture is directly attached to the main journal and the excircle of the connecting rod journal of the crankshaft, the base plane of the whole checking fixture is determined by adopting the principle of fixing three points to one plane, then the right side is provided with a groove according to the calculated theoretical position of the pin hole and the reasonable tolerance requirement, the pin is inserted into the pin hole, the base plane of the checking fixture slides along the surface of the journal, and the pin can be inserted into the groove to be qualified. The checking tools such as a flat plate, a V-shaped block, a height gauge, a dial indicator and the like are not needed during detection, the checking steps are simplified, and the quick checking tool is directly designed to be attached to a product for checking.
(2) The rapid detection tool is small and exquisite, is convenient to carry and use, and can be used for detecting products rapidly, and the detection time of each product is about 10 seconds; whether the quality is qualified or not is directly judged by the checking fixture, calculation by an inspector is not needed, and the requirement on the skill of the inspector is not high.
Drawings
Fig. 1 is a schematic front structural view of the present invention.
Fig. 2 is a left side view structural diagram of the present invention.
Fig. 3 is a schematic diagram of a practical structure of the present invention.
FIG. 4 is a graphical illustration of a datum hole and slot tolerance calculation in an embodiment of the present invention.
FIG. 5 is another graphical illustration of the datum hole and slot tolerance calculation in an embodiment of the present invention.
Wherein, the names corresponding to the reference numbers are:
1-a gauge base plate, 2-a positioning plate, 3-a positioning groove plate, 4-a reference hole groove, 5-a main journal, 6-a connecting rod journal and 7-a flywheel.
Detailed Description
The present invention will be further described with reference to the following description and examples, which include but are not limited to the following examples.
Examples
As shown in fig. 1 to 3, the crankshaft flywheel positioning pin hole angle quick detection tool disclosed by the utility model comprises a detection tool base plate 1 and three positioning plates 2 arranged on the detection tool base plate; the three positioning plates 2 are used for being respectively attached to the two main journals and the excircle of the connecting rod journal of the crankshaft, and the plane of the checking fixture substrate 1 is determined by the three attachment points; the side surface of the checking fixture substrate 1 is vertically connected with a positioning groove plate 3, and a reference hole groove 4 is formed in the positioning groove plate 3. The gauge base plate 1, the positioning plate 2 and the positioning groove plate 3 are integrally formed and made of aluminum alloy.
When the quick detection tool is used, the detection tool must be matched with a special detection tool for the center distance of the pin hole, the quick detection tool is directly attached to the outer circles of the two main journals 5 and the outer circle of the connecting rod journal 6, the principle that one plane is fixed by three points is adopted, the base plane of the whole detection tool is determined, a groove is formed in the right side according to the calculated theoretical position of the pin hole and the reasonable tolerance requirement, a pin is inserted into the pin hole, the base plane of the detection tool slides along the surface of the journal, and the pin can be inserted into the groove to be qualified.
The diameters of the finished main journals are consistent, the diameter tolerance and the run-out value are small and can be ignored, and the base surface is simplified into a straight line in a left view. See FIG. 4: o is1Is the center of the main journal, O2Is the circle center of the neck of the connecting rod, point P is the circle center of the theoretical position of the pin hole, point A is the tangent point of the plane of the checking tool and the main journal, point B is the tangent point of the checking tool and the neck of the connecting rod, point E is the intersection point of the extension of the horizontal center line of the main journal and the point AB, and point O1O2The center distance H of the connecting rod neck is 39.4, O1A is the radius R of main journal equal to 24, O2B is the radius r of the connecting rod neck is 22; angle of erection EO1P is the theoretical angle alpha of the pin hole of 60 DEG, O1And P is the theoretical center distance h of the pin hole equal to 30. Crossing the P point as an AB parallel line and connecting with O1The extension line A intersects with the point C.
First, make an auxiliary lineO2D and O1A is vertically intersected with the point D;
do a quadrilateral ABO2D is a rectangle and is a square,
∴AD＝O2B，O1D＝R-r＝2；
at Δ O1O2In D, sin & lt O1 O2D＝O1D/O1O2＝2/39.4，
Then < O1 O2D≈2.91°；
∵△O1O2D and DELTA O1AE has two sides perpendicular to each other;
∴△O1O2d and DELTA O1AE is similar delta;
then < AO1 E＝∠O1 O2D＝2.91°；
∠CO1P＝60-2.91＝57.09°；
cos∠CO1P＝O1C/O1P；
Then O is1C＝30×cos57.09°≈16.3
Thus, the distance AC between the center plane of the reference hole groove and the base plane of the checking tool is obtained as O1A-O1C＝24-16.3＝7.7。
See FIG. 5, the tolerance band of the pin hole angle of + -0.25 deg. on the pin hole radius tangent is EF, and the solution is obtained by passing E, F point and pressing with O1O2Tilting
Two parallel lines with an angle of 2.91 degrees are taken as a reference hole groove width tolerance zone T,
the perpendicular line FG to one of the parallel lines is drawn through point F, FG being T,
the vane EF is the chord length corresponding to the pin hole angle of +/-0.25 DEG
∴EF＝2hsin0.5°＝2*30*sin0.5°≈0.52
See the picture ═ EFG ═ O1 PC＝∠O2 O1P+∠O1 O2D＝30°+2.91°＝32.91°
∵GF＝EF*cos∠EFG＝0.52*cos32.91°≈0.44
Theoretical tolerance of reference hole slot width T ≈ 0.44.
The size and the position of the reference hole groove are determined according to the distance between the center plane of the reference hole groove and the base plane of the checking fixture and the theoretical tolerance of the groove width of the checking fixture, so that the positioning pin hole of the flywheel 7 can be accurately detected.
Through the design, the rapid detection tool is small and exquisite, is convenient to carry and use, can be used for detecting products rapidly, and needs about 10 seconds of detection time for each product; whether the quality is qualified or not is directly judged by the checking fixture, calculation by an inspector is not needed, and the requirement on the skill of the inspector is not high. Thus, the present invention provides substantial features and improvements over the prior art.
The above-mentioned embodiment is only one of the preferred embodiments of the present invention, and should not be used to limit the scope of the present invention, but all the insubstantial modifications or changes made within the spirit and scope of the main design of the present invention, which still solve the technical problems consistent with the present invention, should be included in the scope of the present invention.
Claims (3)
1. A crankshaft flywheel positioning pin hole angle quick detection tool is characterized by comprising a detection tool base plate (1) and three positioning plates (2) arranged on the detection tool base plate; the three positioning plates (2) are used for being respectively attached to the two main journals and the excircle of the connecting rod journal of the crankshaft, and the plane of the checking fixture substrate (1) is determined by the three attachment points; the side surface of the checking fixture base plate (1) is vertically connected with a positioning groove plate (3), and a reference hole groove (4) is formed in the positioning groove plate (3).
2. The crankshaft flywheel positioning pin hole angle quick detection tool according to claim 1 is characterized in that the detection tool base plate (1), the positioning plate (2) and the positioning groove plate (3) are integrally formed.
3. The crankshaft flywheel positioning pin hole angle quick detection tool according to claim 2 is characterized in that the detection tool base plate (1), the positioning plate (2) and the positioning groove plate (3) are made of aluminum alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122480633.5U CN216348317U (en) | 2021-10-14 | 2021-10-14 | Fast check tool for crankshaft flywheel positioning pin hole angle |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122480633.5U CN216348317U (en) | 2021-10-14 | 2021-10-14 | Fast check tool for crankshaft flywheel positioning pin hole angle |
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| CN216348317U true CN216348317U (en) | 2022-04-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116766135A (en) * | 2023-08-23 | 2023-09-19 | 成都国营锦江机器厂 | Helicopter main reducer stay bar hole center distance measuring tool and method |
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2021
- 2021-10-14 CN CN202122480633.5U patent/CN216348317U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116766135A (en) * | 2023-08-23 | 2023-09-19 | 成都国营锦江机器厂 | Helicopter main reducer stay bar hole center distance measuring tool and method |
| CN116766135B (en) * | 2023-08-23 | 2023-11-07 | 成都国营锦江机器厂 | Helicopter main reducer stay bar hole center distance measuring tool and method |
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