CN108917535A - Piston stroke measurement tooling and method in marine diesel - Google Patents
Piston stroke measurement tooling and method in marine diesel Download PDFInfo
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- CN108917535A CN108917535A CN201810834226.XA CN201810834226A CN108917535A CN 108917535 A CN108917535 A CN 108917535A CN 201810834226 A CN201810834226 A CN 201810834226A CN 108917535 A CN108917535 A CN 108917535A
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- mandril
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- diesel engine
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- 238000005259 measurement Methods 0.000 title claims description 27
- 238000000034 method Methods 0.000 title claims description 13
- 239000000446 fuel Substances 0.000 claims abstract description 23
- 238000002347 injection Methods 0.000 claims description 19
- 239000007924 injection Substances 0.000 claims description 19
- 238000013461 design Methods 0.000 claims description 18
- 239000002283 diesel fuel Substances 0.000 claims 1
- 238000012360 testing method Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Classifications
-
- 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
- G01B5/02—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Engines (AREA)
Abstract
The invention discloses piston strokes in marine diesel to measure tooling, and the top of piston is equipped with mandril, and mandril, which is upward through, actuates pump case, and mandril is slidably connected with pump case is actuated；Flange sleeve is cased on mandril, flange sleeve is fixedly connected with the top for actuating pump case；Bushing is fixedly installed on the mandril on flange sleeve top；Mandril top is cased with flange, is cased with spring on the mandril between flange and bushing；The top of mandril is fixedly connected with the measuring rod of dial gauge, and the bottom of dial gauge is fixedly connected with magnetic stand.The present invention can accurately measure the stroke of piston, and the opposite crank angle with stroke by the reading of observation dial gauge；So as to record the corresponding crank angle of required piston stroke, to obtain corresponding crank angle when diesel engine fuel jetting valve and exhaust valve opening, foundation is provided for diesel engine test and adjustment.
Description
Technical field
The present invention relates to marine low speed diesel engines to manufacture field, and in particular to piston stroke measures in marine diesel
Tooling and method.
Background technique
In marine low speed diesel engine manufacturing field, diesel engine fuel jetting valve crank angle and exhaust corresponding when opening
Valve crank angle corresponding when opening is to actuate what pump piston stroke obtained by measurement, and part of diesel engine actuates pump
Piston stroke measurement accuracy requires to be less than ± 0.02mm.Currently used method is to actuate pump piston upper design threaded hole,
A piece lengthening stud is installed, by installing stroke when dial gauge measures piston motion on stud top on threaded hole.This side
There are three disadvantages for method：
1, measurement accuracy is low, about ± 0.04mm.Piston, can be because during downlink after top dead centre (highest point)
There is the case where piston running track discontinuous (static and retardance) for the frictional force by piston ring, causes measurement error, it can
Diesel engine operation can be caused not to be able to satisfy code requirement.
2, the Design of Screw Thread of threaded hole and lengthening stud is easy to generate iron filings during repeated disassembled and assembled, and iron filings will cause work
Plug ring damage.
3, piston material is hard, carries out screw thread process at an upper portion thereof and increases cost of manufacture.
Therefore, need to design piston stroke measurement tooling in a kind of marine diesel.
Summary of the invention
The purpose of the present invention is to overcome above-mentioned the deficiencies in the prior art, provide piston stroke in marine diesel to measure work
Dress.
To achieve the above object, the present invention adopts the following technical solutions：Piston stroke measures tooling, packet in marine diesel
Include the piston for actuating pump case and actuating inside pump case；
The top of the piston is equipped with mandril, and the mandril, which is upward through, actuates pump case, the mandril and actuates pump case
Body is slidably connected；
Flange sleeve is cased on the mandril, the mandril is slidably connected with flange sleeve, the flange sleeve with
The top for actuating pump case is fixedly connected；
Bushing is fixedly installed on the mandril on the flange sleeve top；
The mandril top is cased with flange, and the mandril is slidably connected with flange；It is set in the threaded hole of the flange
There is stud, the bottom of the stud is threadedly coupled with flange sleeve, and the top of the stud is equipped with nut；
Spring is cased on mandril between the flange and bushing；
The top of the mandril is fixedly connected with the measuring rod of dial gauge, and bottom and the magnetic stand of the dial gauge are fixed
Connection, the magnetic stand are fixed at the top for actuating pump case.
Preferably, the flange sleeve with actuate pump case and be fixedly connected by bolt.
Preferably, the lateral surface bottom of the bushing is along the circumferential direction equipped with the support level of support spring bottom, described
The medial surface bottom of bushing is along the circumferential direction equipped with annular slot；
The junction of the mandril and bushing be along the circumferential direction equipped with annular protrusion, the annular protrusion and annular slot into
Row is connected together.
Tooling is measured using piston stroke in marine diesel provided by the invention, song when measurement fuel injection valve is opened
The step of Shaft angle and cam lift, is as follows：
Step 1：Up time dials turns crankshaft, rotates diesel engine cam ring, and the variation by observing percentage meter reading is found
The extreme lower position of piston stroke, dial gauge is adjusted to zero-bit at this time, records the crank angle β of diesel engine at this time1；
Step 2：Continue up time dials and turn crankshaft, diesel engine cam ring is made to continue to rotate, up to Crankshaft motion to highest point
Position, stop disc turn, and record percentage meter reading Z at this time, and record the crank angle β of diesel engine at this time2；
Step 3：Calculate the cam lift H, H=Z when fuel injection valve is opened；Calculate song when fuel injection valve is opened
Shaft angle β, β=β2-β1；
Step 4：Crankshaft when cam lift Z and fuel injection valve when the fuel injection valve measured is opened are opened turns
Angle beta is compared with design requirement, is such as unsatisfactory for requiring, and adjusts the cam of diesel engine until meeting design requirement.
Tooling is measured using piston stroke in marine diesel provided by the invention, crankshaft when measuring exhaust valve opening turns
The step of angle, is as follows：
Step 1：Up time dials turns crankshaft, rotates diesel engine cam ring, and the variation by observing percentage meter reading is found
The extreme lower position of piston stroke, dial gauge is adjusted to zero-bit at this time；
Step 2：Continue up time dials and turn crankshaft, until piston lift reaches the lift L of design requirement, records at this time
The crank angle θ of diesel engine1；
Step 3：Continue up time dials and turn crankshaft, until piston passes through its extreme higher position, and returns in piston identical
The crankshaft angles θ of diesel engine at this time is read when lift L2；
Step 4：Calculate the crank angle θ, θ=180 °-(θ when exhaust valve opening1+θ2)/2；
Step 5：Crank angle θ when the exhaust valve opening that will be measured is compared with design value, is such as unsatisfactory for requiring,
The cam of diesel engine is adjusted until meeting design requirement.
Beneficial effect：
(1) piston stroke measurement tooling can be surveyed accurately by the reading of observation dial gauge in marine diesel of the present invention
Measure the stroke of piston, and the opposite crank angle with stroke；Turn so as to record the corresponding crankshaft of required piston stroke
Angle mentions to obtain corresponding crank angle when diesel engine fuel jetting valve and exhaust valve opening for diesel engine test and adjustment
For foundation.
(2) piston stroke measurement tooling by spring applies one vertically downward to piston in marine diesel of the present invention
Power, because of running track discontinuous problem caused by piston-ring friction resistance when eliminating piston downlink, this frock making is simple, at
This is low, and measurement accuracy is high, easy to operate, can provide measurement accuracy significantly, saves production cost.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of piston stroke measurement tooling in marine diesel of the present invention；
Fig. 2 is using crankshaft when piston stroke measurement tooling measurement fuel injection valve is opened in marine diesel of the present invention
The structural schematic diagram of corner；
Fig. 3 is using the crank angle in marine diesel of the present invention when piston stroke measurement tooling measurement exhaust valve opening
Structural schematic diagram；；
Wherein 1- dial gauge, 2- magnetic stand, 3- nut, 4- flange, 5- stud, 6- spring, 7- mandril, 8- bushing, 9-
Flange sleeve, 10- bolt, 11- actuate pump case, 12- piston, 13- cam.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and examples.
As shown in Figure 1, piston stroke measures tooling in marine diesel, including actuates pump case 11 and actuate pump case
Piston 12 inside 11, that is, need to measure the stroke of piston 12；
The top of the piston 12 is equipped with mandril 7, and the mandril 7, which is upward through, actuates pump case 11, the mandril 7 and rush
Dynamic pump case 11 is slidably connected, i.e., mandril 7 can follow the reciprocating of piston 12 to move up and down；
Flange sleeve 9 is cased on the mandril 7, the mandril 7 is slidably connected with flange sleeve 9, wherein flange sleeve
Pipe 9 and mandril 7 use small―gap suture precision-fit, to reduce the relative displacement of each measuring part in measurement process, it is further provided
Measurement accuracy；The flange sleeve 9 is fixedly connected with the top for actuating pump case 11；
Bushing 8 is fixedly installed on the mandril 7 on 9 top of flange sleeve, wherein bushing 8 can follow moves down on mandril 7
It is dynamic；
7 top of mandril is cased with flange 4, and the mandril 7 is slidably connected with flange 4；The threaded hole of the flange 4
In be equipped with stud 5, the bottom of the stud 5 is threadedly coupled with flange sleeve 9, and the top of the stud 5 is equipped with nut；
Spring 6 is cased on mandril 7 between the flange 4 and bushing 8；
The top of the mandril 7 is fixedly connected with the measuring rod of dial gauge 1, the bottom of the dial gauge and magnetic stand 2
It is fixedly connected, the magnetic stand 2 is fixed at the top for actuating pump case；
When piston 12 moves upwards, mandril 7 is driven to move upwards, and mandril 7 drives bushing 8 to move upwards, and bushing 8
Meeting compressed spring 6 when moving upwards, when piston 12 moves downward, the spring 6 of compression can force mandril 7, bushing 8 also to be transported downwards
It is dynamic, to realize that mandril 7 follows piston 12 to move reciprocatingly；The spring 6 of compression is also that piston 12 applies one downwards simultaneously
Power guarantees measurement accuracy so that it is continuous to control 12 running track of piston in entire measurement process；
Mandril 7 follows piston 12 to move reciprocatingly simultaneously, and dial gauge 1 obtains piston 12 by the stroke of measurement mandril 7
Stroke.
Preferably, the flange sleeve 9 with actuate pump case 11 and be fixedly connected by bolt 10.
Preferably, the lateral surface bottom of the bushing 9 is along the circumferential direction equipped with the support level of 6 bottom of support spring, institute
The medial surface bottom for stating bushing 9 is along the circumferential direction equipped with annular slot；
The junction of the mandril 7 and bushing 9 is along the circumferential direction equipped with annular protrusion, the annular protrusion and annular slot
It is connected together, to enable bushing 9 that mandril 7 to be followed to move.
The fuel injection valve and exhaust valve of marine low speed diesel engine mostly pass through the transmission mechanism connected on crankshaft and carry out machine
The unlatching of tool mode, and the course of work of the opening time and diesel engine of fuel injection valve and exhaust valve are closely related, therefore,
In marine low speed diesel engine manufacturing process, in order to be tested diesel engine and be adjusted, need to determine first fuel injection valve and
The exhaust valve opening time, i.e., it needs to be determined that corresponding crank angle when they are opened, thus the driver that these valves will be opened
Structure is fixed on crankshaft corresponding position, and when crank rotation is to special angle, corresponding transmission mechanism will promote corresponding valve to beat
It opens.
And crank angle when obtaining these valve openings, it can be obtained by measuring the stroke of piston 12, specific side
Method is as follows.
" extreme lower position " in the application refers to that the bottom of the reciprocating stroke of piston 12, " extreme higher position " refer to
The top of the reciprocating stroke of piston 12.
Tooling is measured using piston stroke in marine diesel provided by the invention, song when measurement fuel injection valve is opened
The step of Shaft angle and cam lift, is as follows：
Step 1：As shown in Fig. 2, up time dials turns crankshaft, rotate diesel engine cam ring 13, by observing dial gauge 1
The extreme lower position of 12 stroke of piston is found in the variation of reading, and dial gauge 1 is adjusted to zero-bit at this time, records the crankshaft of diesel engine at this time
Corner β1；
Step 2：Continue up time dials and turn crankshaft, diesel engine cam ring 13 is made to continue to rotate, up to Crankshaft motion to highest
Point position, stop disc turn, and dial gauge 1 reads Z to record at this time, and records the crank angle β of diesel engine at this time2；
Step 3：Calculate the cam lift H, H=Z when fuel injection valve is opened；Calculate song when fuel injection valve is opened
Shaft angle β, β=β2-β1；
Step 4：Crankshaft when cam lift Z and fuel injection valve when the fuel injection valve measured is opened are opened turns
Angle beta is compared with design requirement, is such as unsatisfactory for requiring, and adjusts the cam of diesel engine until meeting design requirement.
Tooling is measured using piston stroke in marine diesel provided by the invention, crankshaft when measuring exhaust valve opening turns
The step of angle, is as follows：
Step 1：As shown in figure 3, up time dials turns crankshaft, rotate diesel engine cam ring 13, by observing dial gauge 1
The extreme lower position of 12 stroke of piston is found in the variation of reading, the modulation of dial gauge 1 at this time to zero-bit；
Step 2：Continue up time dials and turn crankshaft, until piston lift reaches the lift L of design requirement, records at this time
The crank angle θ of diesel engine1；
Step 3：Continue up time dials and turn crankshaft, until its extreme higher position of the process of piston 12, and returns to phase in piston
With the crankshaft angles θ for reading diesel engine at this time when lift L2；
Step 4：Calculate the crank angle θ, θ=180 °-(θ when exhaust valve opening1+θ2)/2；
Step 5：Crank angle θ when the exhaust valve opening that will be measured is compared with design value, is such as unsatisfactory for requiring,
The cam of diesel engine is adjusted until meeting design requirement.
Further, it is also possible to measure other stroke values and the corresponding crank angle of these stroke values of piston 12.
Piston stroke measurement tooling can determine piston 12 by the reading of observation dial gauge 1 in marine diesel of the present invention
Stroke, and opposite other stroke values with minimum stroke；The present invention can recorde this when measuring 12 stroke of piston simultaneously
Corresponding crank angle under 12 stroke of piston turns to obtain corresponding crankshaft when diesel engine fuel jetting valve and exhaust valve opening
Angle provides foundation for diesel engine test and adjustment.
In the description of the present invention, it is to be understood that, term " on ", "bottom", " extreme higher position ", " extreme lower position " etc.
Orientation or positional relationship is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of the description present invention and simplification is retouched
It states, rather than the device or element of indication or suggestion meaning must have a particular orientation, be constructed and operated in a specific orientation,
Therefore it is not considered as limiting the invention.
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not to limit of the invention
System, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art do not need to pay
The various modifications or changes that creative work can be made out are still within protection scope of the present invention.
Claims (5)
1. piston stroke measures tooling in marine diesel, including actuating pump case and actuating the piston inside pump case；Its
It is characterized in,
The top of the piston be equipped with mandril, the mandril, which is upward through, actuates pump case, the mandril and actuate pump case into
Row is slidably connected；
Flange sleeve is cased on the mandril, the mandril is slidably connected with flange sleeve, the flange sleeve with actuate
The top of pump case is fixedly connected；
Bushing is fixedly installed on the mandril on the flange sleeve top；
The mandril top is cased with flange, and the mandril is slidably connected with flange；Spiral shell is equipped in the threaded hole of the flange
The bottom of column, the stud is threadedly coupled with flange sleeve, and the top of the stud is equipped with nut；
Spring is cased on mandril between the flange and bushing；
The top of the mandril is fixedly connected with the measuring rod of dial gauge, the bottom of the dial gauge and the fixed company of magnetic stand
It connects, the magnetic stand is fixed at the top for actuating pump case.
2. piston stroke measures tooling in marine diesel as shown in claim 1, characterized in that the flange sleeve and rush
Dynamic pump case is fixedly connected by bolt.
3. piston stroke measures tooling in marine diesel as shown in claim 1, characterized in that the lateral surface of the bushing
Bottom is along the circumferential direction equipped with the support level of support spring bottom, and the medial surface bottom of the bushing is along the circumferential direction equipped with ring
Shape card slot；
The junction of the mandril and bushing is along the circumferential direction equipped with annular protrusion, the annular protrusion and annular slot card
Close connection.
4. being opened using piston stroke measurement tooling measurement fuel injection valve in marine diesel a method according to any one of claims 1-3
Crank angle when opening, characterized in that include the following steps：
Step 1：Up time dials turns crankshaft, rotates diesel engine cam ring, and piston is found in the variation by observing percentage meter reading
The extreme lower position of stroke, dial gauge is adjusted to zero-bit at this time, records the crank angle β of diesel engine at this time1；
Step 2：Continue up time dials and turn crankshaft, diesel engine cam ring is made to continue to rotate, up to Crankshaft motion to highest point
It sets, stop disc turns, and records percentage meter reading Z at this time, and record the crank angle β of diesel engine at this time2；
Step 3：Calculate the cam lift H, H=Z when fuel injection valve is opened；Crankshaft when fuel injection valve is opened is calculated to turn
Angle beta, β=β2-β1；
Step 4：By the fuel injection valve measured open when cam lift Z and fuel injection valve open when crank angle β with
Design requirement compares, and is such as unsatisfactory for requiring, and adjusts the cam of diesel engine until meeting design requirement.
5. using when piston stroke measurement tooling measures exhaust valve opening in marine diesel a method according to any one of claims 1-3
Crank angle, characterized in that include the following steps：
Step 1：Up time dials turns crankshaft, rotates diesel engine cam ring, and piston is found in the variation by observing percentage meter reading
The extreme lower position of stroke, dial gauge is adjusted to zero-bit at this time；
Step 2：Continue up time dials and turn crankshaft, until piston lift reaches the lift L of design requirement, records diesel oil at this time
The crank angle θ of machine1；
Step 3：Continue up time dials and turn crankshaft, until piston passes through its extreme higher position, and returns to identical lift in piston
The crankshaft angles θ of diesel engine at this time is read when L2；
Step 4：Calculate the crank angle θ, θ=180 °-(θ when exhaust valve opening1+θ2)/2；
Step 5：Crank angle θ when the exhaust valve opening that will be measured is compared with design value, is such as unsatisfactory for requiring, adjustment
The cam of diesel engine is until meet design requirement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810834226.XA CN108917535A (en) | 2018-07-26 | 2018-07-26 | Piston stroke measurement tooling and method in marine diesel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810834226.XA CN108917535A (en) | 2018-07-26 | 2018-07-26 | Piston stroke measurement tooling and method in marine diesel |
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| Publication Number | Publication Date |
|---|---|
| CN108917535A true CN108917535A (en) | 2018-11-30 |
Family
ID=64417533
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810834226.XA Pending CN108917535A (en) | 2018-07-26 | 2018-07-26 | Piston stroke measurement tooling and method in marine diesel |
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| Country | Link |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113108677A (en) * | 2021-04-02 | 2021-07-13 | 淄柴机器有限公司 | Online detection device and method for coaxiality of cylinder body of dual-fuel engine |
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