CN109812351A - Engine spray cloth oil piston - Google Patents
Engine spray cloth oil piston Download PDFInfo
- Publication number
- CN109812351A CN109812351A CN201910148277.1A CN201910148277A CN109812351A CN 109812351 A CN109812351 A CN 109812351A CN 201910148277 A CN201910148277 A CN 201910148277A CN 109812351 A CN109812351 A CN 109812351A
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- Prior art keywords
- piston
- oil
- pin
- piston pin
- spray cloth
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- 239000007921 spray Substances 0.000 title claims abstract description 35
- 239000004744 fabric Substances 0.000 title claims abstract description 31
- 239000003921 oil Substances 0.000 claims abstract description 164
- 239000010687 lubricating oil Substances 0.000 claims abstract description 24
- 238000010276 construction Methods 0.000 claims abstract description 5
- 238000005507 spraying Methods 0.000 claims description 2
- 241001125877 Gobio gobio Species 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 13
- 239000000314 lubricant Substances 0.000 abstract description 7
- 238000005299 abrasion Methods 0.000 abstract description 5
- 230000001050 lubricating effect Effects 0.000 description 8
- 238000000034 method Methods 0.000 description 6
- 238000005461 lubrication Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 241001125879 Gobio Species 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 235000013399 edible fruits Nutrition 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008450 motivation Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000002146 bilateral effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000010727 cylinder oil Substances 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000010721 machine oil Substances 0.000 description 1
- 235000012771 pancakes Nutrition 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000010729 system oil Substances 0.000 description 1
Landscapes
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
A kind of engine spray cloth oil piston, comprising: piston only, inside have hollow cavity, piston only axial direction is provided with perforative piston pin hole；Connecting rod, column construction, along one end for being connected axially to piston only of piston only, the connecting rod is provided with radial hollow connecting rod oil line；And piston pin, it is cylindrical, it is pinned in the piston pin hole of the piston only.The piston only, comprising: oil ring；Piston oil input channel；Piston arc oil duct, is connected with piston oil input channel, is circumferentially arranged along piston outer wall；And piston jet, multiple piston jets are uniformly arranged on piston outer wall and correspond at the piston arc oil duct, it is communicated with the piston arc oil duct, for the lubricating oil in piston arc oil duct uniformly to be sprayed, engine spray cloth oil piston described in the disclosure can optimize lubricant effect, abrasion is reduced, the service life of piston is extended.
Description
Technical field
This disclosure relates to which engine piston and machinery manufacturing technology field more particularly to a kind of engine spray cloth oil are living
Plug.
Background technique
Piston moves back and forth in cylinder, in order to which guarantee effect is capable of the logical of higher efficiency in the power of piston
It crosses piston connecting rod unit and passes to crankshaft, the lubricant effect between piston and cylinder is most important.
The main function lubricated between cylinder and piston includes the friction loss reduced between cylinder wall and piston, is prevented
Degree abrasion influences the service life；Auxiliary seal；The combustion residue of cylinder wall surface is taken away, noise is mitigated.
In prior art, the lubricating system between engine piston and cylinder includes splash lubrication and Cylinder lubricating profit
It is sliding.
Lubrication of splashing is rotated by crankshaft, and the machine oil of oil sump is thrown away to be splashed on cylinder wall and is lubricated by connecting rod.This
Kind lubricating system is influenced by the revolving speed of engine, structure, and lubricating oil is unevenly distributed, and fuel delivery is unstable and not can control,
Lubricant effect is poor.
Cylinder lubricating lubrication is by dedicated steam cylinder oil using dedicated lubricating system and equipment through the oiling on cylinder wall
Hole note is lubricated to cylinder surface.Crosshead type diesel engine uses this lubricating system at present.This lubricating system oil duct
It is too long, structure is complicated, oil pressure loss is big, lubricant effect is bad, and is not easy to overhaul.
Pancake engine, which is mostly used, at present is arranged atomizer in cylinder lower part, and lubricating oil is sprayed onto cylinder
Wall top, then lubricating oil is lubricated under the gravity stream, is equally existed lubricating oil and is unevenly distributed that lubricant effect is poor to ask
Topic.
Disclosure
(1) technical problems to be solved
Based on the above issues, present disclose provides a kind of engine spray cloth oil pistons, are lubricated in the prior art with alleviating
The technical problems such as oil distribution is uneven, lubricant effect is poor.
(2) technical solution
The disclosure provides a kind of engine spray cloth oil piston, comprising: piston only, inside have hollow cavity, perpendicular to
Piston only axial direction is provided with perforative piston pin hole；Connecting rod, column construction are connected axially to piston along piston only
One end of ontology, the connecting rod are provided with radial hollow connecting rod oil line；And piston pin, it is cylindrical, it is pinned at the piston
In the piston pin hole of ontology.
In the embodiments of the present disclosure, the piston only, comprising: oil ring；Piston oil input channel；Piston arc oil duct, with work
It fills in oil duct to be connected, circumferentially be arranged along piston outer wall；And piston jet, multiple piston jets are uniformly arranged on outside piston
Wall corresponds at the piston arc oil duct, communicates with the piston arc oil duct, for by the lubricating oil in piston arc oil duct
Uniformly spray.
In the embodiments of the present disclosure, the piston pin, comprising: piston pin sealing-plug, positioned at the both ends of piston pin；Piston pin
Oil duct is set to inside piston pin, including the piston pin main oil gallery and a plurality of and piston pin main oil gallery along gudgeon pin shaft to setting
The piston pin radial direction oil being arranged radially along piston pin being connected；And piston pin oil groove, the corresponding radial direction oil position
It is set to the surface of piston pin, and wherein a position for corresponding to the connecting rod oil line simultaneously is arranged.
In the embodiments of the present disclosure, the quantity of the piston arc oil duct is 2.
In the embodiments of the present disclosure, the piston arc oil duct is symmetrical.
In the embodiments of the present disclosure, quantity >=2 of the piston arc oil duct.
In the embodiments of the present disclosure, quantity >=2 of the piston oil input channel.
In the embodiments of the present disclosure, the piston pin oil groove corresponds to the oil inlet setting of piston oil input channel.
In the embodiments of the present disclosure, the piston pin includes 3 piston pin oil grooves and 3 piston pin radial direction oils.
In the embodiments of the present disclosure, the shape in the piston pin hole section is circle.
(3) beneficial effect
It can be seen from the above technical proposal that disclosure engine spray cloth oil piston at least has the advantages that it
One of or in which a part:
(1) optimize lubricant effect, reduce abrasion；
(2) oil duct is provided with internal piston while can also play cooling effect, extends the service life of piston.
Detailed description of the invention
Fig. 1 is the longitudinal profile structure schematic of embodiment of the present disclosure engine spray cloth oil piston.
Fig. 2 splits rear horizontal section structure along A-A shown in Fig. 1 for embodiment of the present disclosure engine spray cloth oil piston and shows
It is intended to.
Fig. 3 is the piston only structural schematic diagram of embodiment of the present disclosure engine spray cloth oil piston.
Fig. 4 is the piston pin structural schematic diagram of embodiment of the present disclosure engine spray cloth oil piston.
[embodiment of the present disclosure main element symbol description in attached drawing]
1- piston only；2- piston pin；3- connecting rod；4- piston pin sealing-plug；5- connecting rod oil line；6- piston pin main oil gallery；
7- piston pin radial direction oil；8- piston pin oil groove；9- piston oil input channel；10- piston arc oil duct；11- piston jet.
Specific embodiment
Present disclose provides a kind of engine spray cloth oil piston, the engine spray cloth oil piston is a kind of new hair
Motivation sprays cloth oil piston structure, and lubricating oil reaches main oil gallery inside piston pin by connecting rod from crankshaft oil passage.Lubricating oil is from work
Plug pin oil groove enters piston oil input channel, is then ejected into cylinder inner wall by the jet opened up on piston.Because of jet
It is spaced, so lubricating oil can uniformly be sprayed onto cylinder inner wall.Jet is located at oil ring lower part, when piston downlink, spray
Oil ring scrapes lubricating oil after oil, and applies one layer of oil film in cylinder inner wall.Uniform injection lubricating oil can optimize lubrication effect
Fruit reduces abrasion.Oil duct is provided with internal piston while can also play cooling effect simultaneously, extends the service life of piston.
For the purposes, technical schemes and advantages of the disclosure are more clearly understood, below in conjunction with specific embodiment, and reference
The disclosure is further described in attached drawing.
In the embodiments of the present disclosure, a kind of engine spray cloth oil piston, in conjunction with shown in Fig. 1 to Fig. 4, the hair are provided
Motivation sprays cloth oil piston, comprising:
Piston only 1, inside have hollow cavity, piston only axial direction is provided with perforative piston pin hole；
The piston only, comprising:
Oil ring；
Piston oil input channel 9；
Piston arc oil duct 10, is connected with piston oil input channel 9, is circumferentially arranged along piston outer wall；
Piston jet 11, multiple piston jets 11 are uniformly arranged on piston outer wall and correspond to the piston arc oil duct 10
Place, communicates with the piston arc oil duct 10, for uniformly spraying the lubricating oil in piston arc oil duct 10；
Connecting rod 3, column construction, along one end for being connected axially to piston only of piston only, the connecting rod 3 is provided with diameter
To hollow connecting rod oil line 5；
Piston pin 2, it is cylindrical, it is pinned in the piston pin hole of the piston only 1, is axially perpendicular to piston only axis
To, comprising:
Piston pin sealing-plug 4, positioned at the both ends of piston pin 2；
Piston pin oil duct is set to inside piston pin 2, including along gudgeon pin shaft to the piston pin main oil gallery 6 of setting and more
The piston pin radial direction oil 7 being arranged radially along piston pin that item is connected with piston pin main oil gallery 6；
Piston pin oil groove 8, the corresponding radial direction oil position are set to the surface of piston pin, and a wherein correspondence simultaneously
The position of the connecting rod oil line 5 is arranged.
In the embodiments of the present disclosure, in conjunction with shown in Fig. 1 to Fig. 4, the piston pin 2 is laterally pinned at the piston only 1
Piston pin hole in；The oil inlet setting of the corresponding piston oil input channel 9 of the piston pin oil groove 8.
The shape in the piston pin hole section includes: circle；
The shape of the piston pin includes: cylinder；
The piston pin 2 includes 3 piston pin oil groove 8 and 3 piston pin radial direction oils 7.
The piston pin 2 in the axial direction be equipped with piston pin main oil gallery 6,2 both ends of piston pin have piston pin sealing-plug 4 to prevent
Only pressure sprays lubricating oil from piston pin both ends in piston pin oil duct.
The centre and bilateral symmetry position of the piston pin 2 are additionally provided with piston pin radial direction oil 7；Corresponding radial direction oil 7
Oil outlet position be equipped with the circumferential piston pin oil groove of ring piston pin 2.
There is the connecting rod oil line 5 of connection connecting rod two end in the connecting rod 5；
In the embodiments of the present disclosure, 2 piston arc oil ducts 10, each piston arc are provided in the piston only
The oil inlet for three piston oil input channels 9 that oil duct 10 is correspondingly connected with all corresponds to the setting of piston pin oil groove.
Piston only 1 opens up multiple jets in oil ring lower part, communicates with piston arc oil duct, multiple jets are along piston
The circumferencial direction interval of ontology is arranged.
In conjunction with shown in Fig. 1 to Fig. 4, lubricating oil is pressed into piston pin main oil gallery 6 by connecting rod oil line 5.Into piston pin master
The lubricating oil of oil duct 6 is full of piston pin oil groove 8 by radial direction oil 7；On piston the right and left respectively there are three piston oil input channel 9 with
Piston pin oil groove 8 communicates, and three piston oil input channels 9 on each side connect a piston arc oil duct 10, and lubricating oil is from piston oil input channel 9
Respectively enter two piston arc oil ducts 10 of internal piston；Piston opens up spaced apart jet 11 in oil ring lower part, with
Piston arc oil duct 10 communicates；In reciprocating motion of the pistons, with the presence of pressure in piston arc oil duct 10, lubricating oil can be passed through
Piston arc oil duct 10 is uniformly sprayed from each piston jet 11, and then in piston downlink, oil ring can be in cylinder inner wall
Surface applies one layer of uniform oil film.Solves lubricating oil splash between cylinder and piston by opening up the jet set
Non-uniform problem improves lubricating efficiency, extends the service life.
So far, attached drawing is had been combined the embodiment of the present disclosure is described in detail.It should be noted that in attached drawing or saying
In bright book text, the implementation for not being painted or describing is form known to a person of ordinary skill in the art in technical field, and
It is not described in detail.In addition, the above-mentioned definition to each element and method be not limited in mentioning in embodiment it is various specific
Structure, shape or mode, those of ordinary skill in the art simply can be changed or be replaced to it.
According to above description, those skilled in the art, which should have disclosure engine spray cloth oil piston, clearly to be recognized
Know.
In conclusion present disclose provides a kind of engine spray cloth oil piston, the engine spray cloth oil piston is
A kind of new engine spray cloth oil piston structure, lubricating oil reach main oil gallery inside piston pin by connecting rod.Lubricating oil is from work
Plug pin oil groove enters piston oil input channel, is then ejected into cylinder inner wall by the jet opened up on piston.Because of jet
It is spaced, so lubricating oil can uniformly be sprayed onto cylinder inner wall.Jet is located at oil ring lower part, when piston downlink, spray
Oil ring scrapes lubricating oil after oil, and applies one layer of oil film in cylinder inner wall.Uniform injection lubricating oil can optimize lubrication effect
Fruit reduces abrasion.Oil duct is provided with internal piston while can also play cooling effect simultaneously, extends the service life of piston.
It should also be noted that, the direction term mentioned in embodiment, for example, "upper", "lower", "front", "rear", " left side ",
" right side " etc. is only the direction with reference to attached drawing, not is used to limit the protection scope of the disclosure.Through attached drawing, identical element by
Same or similar appended drawing reference indicates.When may cause understanding of this disclosure and cause to obscure, conventional structure will be omitted
Or construction.
And the shape and size of each component do not reflect actual size and ratio in figure, and only illustrate the embodiment of the present disclosure
Content.In addition, in the claims, any reference symbol between parentheses should not be configured to the limit to claim
System.
It unless there are known entitled phase otherwise anticipates, the numerical parameter in this specification and appended claims is approximation, energy
Enough bases pass through the resulting required characteristic changing of content of this disclosure.Specifically, all be used in specification and claim
The middle content for indicating composition, the number of reaction condition etc., it is thus understood that repaired by the term of " about " in all situations
Decorations.Under normal circumstances, the meaning expressed refers to include by specific quantity ± 10% variation in some embodiments, some
± 5% variation in embodiment, ± 1% variation in some embodiments, in some embodiments ± 0.5% variation.
Furthermore word "comprising" does not exclude the presence of element or step not listed in the claims.It is located in front of the element
Word "a" or "an" does not exclude the presence of multiple such elements.
The word of ordinal number such as " first ", " second ", " third " etc. used in specification and claim, with modification
Corresponding element, itself is not meant to that the element has any ordinal number, does not also represent the suitable of a certain element and another element
Sequence in sequence or manufacturing method, the use of those ordinal numbers are only used to enable an element and another tool with certain name
Clear differentiation can be made by having the element of identical name.
In addition, unless specifically described or the step of must sequentially occur, there is no restriction in the above institute for the sequence of above-mentioned steps
Column, and can change or rearrange according to required design.And above-described embodiment can be based on the considerations of design and reliability, that
This mix and match is used using or with other embodiments mix and match, i.e., the technical characteristic in different embodiments can be freely combined
Form more embodiments.
Those skilled in the art will understand that can be carried out adaptively to the module in the equipment in embodiment
Change and they are arranged in one or more devices different from this embodiment.It can be the module or list in embodiment
Member or component are combined into a module or unit or component, and furthermore they can be divided into multiple submodule or subelement or
Sub-component.Other than such feature and/or at least some of process or unit exclude each other, it can use any
Combination is to all features disclosed in this specification (including adjoint claim, abstract and attached drawing) and so disclosed
All process or units of what method or apparatus are combined.Unless expressly stated otherwise, this specification is (including adjoint power
Benefit require, abstract and attached drawing) disclosed in each feature can carry out generation with an alternative feature that provides the same, equivalent, or similar purpose
It replaces.Also, in the unit claims listing several devices, several in these devices can be by same hard
Part item embodies.
Similarly, it should be understood that in order to simplify the disclosure and help to understand one or more of each open aspect,
Above in the description of the exemplary embodiment of the disclosure, each feature of the disclosure is grouped together into single implementation sometimes
In example, figure or descriptions thereof.However, the disclosed method should not be interpreted as reflecting the following intention: i.e. required to protect
The disclosure of shield requires features more more than feature expressly recited in each claim.More precisely, as following
Claims reflect as, open aspect is all features less than single embodiment disclosed above.Therefore,
Thus the claims for following specific embodiment are expressly incorporated in the specific embodiment, wherein each claim itself
All as the separate embodiments of the disclosure.
Particular embodiments described above has carried out further in detail the purpose of the disclosure, technical scheme and beneficial effects
Describe in detail it is bright, it is all it should be understood that be not limited to the disclosure the foregoing is merely the specific embodiment of the disclosure
Within the spirit and principle of the disclosure, any modification, equivalent substitution, improvement and etc. done should be included in the guarantor of the disclosure
Within the scope of shield.
Claims (10)
1. a kind of engine spray cloth oil piston, comprising:
Piston only (1), inside have hollow cavity, piston only axial direction is provided with perforative piston pin hole；
Connecting rod (3), column construction, along one end for being connected axially to piston only of piston only (1), connecting rod (3) setting
There is radial hollow connecting rod oil line (5)；And
Piston pin (2), it is cylindrical, it is pinned in the piston pin hole of the piston only (1).
2. engine spray cloth oil piston according to claim 1, the piston only, comprising:
Oil ring；
Piston oil input channel (9)；
Piston arc oil duct (10) is connected with piston oil input channel (9), is circumferentially arranged along piston outer wall；And
Piston jet (11), multiple piston jets (11) are uniformly arranged on piston outer wall and correspond to the piston arc oil duct
(10) it at, is communicated with the piston arc oil duct (10), for uniformly spraying the lubricating oil in piston arc oil duct (10).
3. engine spray cloth oil piston according to claim 1, the piston pin, comprising:
Piston pin sealing-plug (4) is located at the both ends of piston pin (2)；
Piston pin oil duct, is set to that piston pin (2) is internal, including along gudgeon pin shaft to the piston pin main oil gallery (6) of setting and more
The piston pin radial direction oil (7) being arranged radially along piston pin that item is connected with piston pin main oil gallery (6)；And
Piston pin oil groove (8), corresponding radial direction oil (7) position are set to the surface of piston pin, and wherein one it is right simultaneously
The position of the connecting rod oil line (5) is answered to be arranged.
4. engine spray cloth oil piston according to claim 2, the quantity of the piston arc oil duct (10) is 2.
5. engine spray cloth oil piston according to claim 4, the piston arc oil duct (10) is symmetrical.
6. engine spray cloth oil piston according to claim 2, quantity >=2 of the piston arc oil duct (10).
7. engine spray cloth oil piston according to claim 2, quantity >=2 of the piston oil input channel (9).
8. engine spray cloth oil piston according to claim 3, the corresponding piston oil input channel of the piston pin oil groove (8)
(9) oil inlet setting.
9. engine spray cloth oil piston according to claim 3, the piston pin (2) includes 3 piston pin oil grooves (8)
With 3 piston pin radial direction oils (7).
10. engine spray cloth oil piston according to claim 1, the shape in the piston pin hole section is circle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910148277.1A CN109812351A (en) | 2019-02-27 | 2019-02-27 | Engine spray cloth oil piston |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910148277.1A CN109812351A (en) | 2019-02-27 | 2019-02-27 | Engine spray cloth oil piston |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109812351A true CN109812351A (en) | 2019-05-28 |
Family
ID=66607710
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910148277.1A Pending CN109812351A (en) | 2019-02-27 | 2019-02-27 | Engine spray cloth oil piston |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109812351A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113446112A (en) * | 2021-07-29 | 2021-09-28 | 一汽解放汽车有限公司 | Piston link mechanism and engine |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05332114A (en) * | 1992-06-03 | 1993-12-14 | Toyota Autom Loom Works Ltd | Piston lubricating device by oil nozzle hole of connecting rod small end part |
| JPH08232624A (en) * | 1995-02-28 | 1996-09-10 | Toyota Autom Loom Works Ltd | Lubricating structure between piston and connecting rod in internal combustion engine |
| US20020139322A1 (en) * | 2001-03-29 | 2002-10-03 | Murglin Joseph P. | Piston pin bushing cooler |
| JP2009030557A (en) * | 2007-07-27 | 2009-02-12 | Toyota Motor Corp | Internal combustion engine |
| CN204099025U (en) * | 2014-07-29 | 2015-01-14 | 宁波吉利罗佑发动机零部件有限公司 | A kind of engine piston cooling structure |
| CN209724512U (en) * | 2019-02-27 | 2019-12-03 | 天津大学 | Engine spray cloth oil piston |
-
2019
- 2019-02-27 CN CN201910148277.1A patent/CN109812351A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05332114A (en) * | 1992-06-03 | 1993-12-14 | Toyota Autom Loom Works Ltd | Piston lubricating device by oil nozzle hole of connecting rod small end part |
| JPH08232624A (en) * | 1995-02-28 | 1996-09-10 | Toyota Autom Loom Works Ltd | Lubricating structure between piston and connecting rod in internal combustion engine |
| US20020139322A1 (en) * | 2001-03-29 | 2002-10-03 | Murglin Joseph P. | Piston pin bushing cooler |
| JP2009030557A (en) * | 2007-07-27 | 2009-02-12 | Toyota Motor Corp | Internal combustion engine |
| CN204099025U (en) * | 2014-07-29 | 2015-01-14 | 宁波吉利罗佑发动机零部件有限公司 | A kind of engine piston cooling structure |
| CN209724512U (en) * | 2019-02-27 | 2019-12-03 | 天津大学 | Engine spray cloth oil piston |
Non-Patent Citations (1)
| Title |
|---|
| 万欣: "《内燃机设计》", 30 September 1989, 天津：天津大学出版社, pages: 197 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113446112A (en) * | 2021-07-29 | 2021-09-28 | 一汽解放汽车有限公司 | Piston link mechanism and engine |
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