CN106346038B - A kind of piston-pin boss eye processing unit (plant) - Google Patents
A kind of piston-pin boss eye processing unit (plant) Download PDFInfo
- Publication number
- CN106346038B CN106346038B CN201610965681.4A CN201610965681A CN106346038B CN 106346038 B CN106346038 B CN 106346038B CN 201610965681 A CN201610965681 A CN 201610965681A CN 106346038 B CN106346038 B CN 106346038B
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- hole
- guide
- piston
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- lower mounting
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B39/00—General-purpose boring or drilling machines or devices; Sets of boring and/or drilling machines
- B23B39/16—Drilling machines with a plurality of working-spindles; Drilling automatons
- B23B39/161—Drilling machines with a plurality of working-spindles; Drilling automatons with parallel work spindles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B47/00—Constructional features of components specially designed for boring or drilling machines; Accessories therefor
- B23B47/28—Drill jigs for workpieces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
- B23Q3/02—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
- B23Q3/06—Work-clamping means
- B23Q3/062—Work-clamping means adapted for holding workpieces having a special form or being made from a special material
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Jigs For Machine Tools (AREA)
Abstract
The present invention discloses a kind of piston-pin boss eye processing unit (plant), including double drill bit drilling machines.Bearing is perpendicular to the level board and is arranged on the level board；Homonymy of the upper guide pad with lower mounting bar in bearing is arranged；One end of upper guide pad is connect with the upper end of bearing side, and the other end is horizontal to extend outwardly；To install piston, one end is connect lower mounting bar with the lower end of bearing side, and the other end of lower mounting bar is horizontal to extend outwardly；The first guide through hole penetrated through from top to bottom, the second guide through hole are offered in guiding；The corresponding third guide through hole of penetrate through from top to bottom and the first guide through hole, the 4th guide through hole corresponding with the second guide through hole are provided on lower mounting bar；Flexible clamp assemblies include telescopic device, clamping piece；The telescopic end of telescopic device is connect with clamping piece, and clamping piece is to clamp piston.The present invention has the advantages that avoid the appearance, clamping of ellipse eyelet when jewel hole to stablize, improve product quality, reduce rejection rate.
Description
Technical field
The present invention relates to piston technical field more particularly to a kind of piston-pin boss eye processing unit (plant)s.
Background technology
Piston can be mainly divided into three piston top, piston head and piston skirt parts.The main function of piston is subject to vapour
Combustion pressure in cylinder, and this power is transmitted to bent axle by piston pin and connecting rod.
Piston top is the component part of combustion chamber, thus different shapes is often made, and piston of gasoline engine uses flat-top at most
Or concave crown, to keep chamber structure compact, heat dissipation area is small, and manufacturing process is simple.Piston crown is piston boss or more
Part, piston crown ring installation to prevent high temperature, high-pressure gas from scurrying into crankcase, while preventing machine oil from scurrying into combustion chamber.
Piston ring groove all parts below are known as piston skirt.It is to guide piston reciprocating in the cylinder and bear side pressure that it, which is acted on,
Power.
Piston is after preliminary working, according to the requirement of client, needs to carry out jewel hole processing to pin hole seat.Traditional jewel hole side
Mostly manually jewel hole (naked eyes look at method straight) is added but if occurring requiring point-device piston kind using existing formula
Work mode can cause positioning datum to be difficult to determine, cause two pin hole seat eye distances from being difficult to control, and the long amplitude of fluctuation of drill bit is larger, from
And there is oval defect, influence appearance surfaces and the normal quality of production and efficiency.
Invention content
In view of the deficiencies of the prior art, the present invention provides it is a kind of avoid jewel hole when ellipse eyelet appearance, clamping stablize,
The piston-pin boss eye processing unit (plant) for improving product quality, reducing rejection rate.
The present invention is realized by following technological means solves above-mentioned technical problem：A kind of piston-pin boss eye processing dress
It sets, including double drill bit drilling machines, further includes the level board being arranged on the Drilling machines bench, bearing, upper guide pad, lower installation
Stick, flexible clamp assemblies；The bearing is perpendicular to the level board and is arranged on the level board；The upper guide pad and institute
The homonymy that lower mounting bar is stated in the bearing is arranged；One end of the upper guide pad is connect with the upper end of the bearing side, institute
The other end for stating guide pad horizontal extends outwardly；The lower mounting bar is to install piston, one end and the bearing
The lower end of side connects, and the other end of the lower mounting bar is horizontal to extend outwardly；It is offered from upper in the upper guide pad
And the first guide through hole, the second guide through hole of lower perforation；Be provided on the lower mounting bar penetrate through from top to bottom with institute
State the corresponding third guide through hole of the first guide through hole, the 4th guide through hole corresponding with second guide through hole；It is described to stretch
Contracting clamp assemblies include telescopic device, clamping piece；The telescopic end of the telescopic device is connect with the clamping piece, the clamping piece
To clamp piston.
Preferably：The clamping piece includes the first grip block, the second grip block；First grip block, the second grip block
It is oppositely arranged on the both sides of the lower mounting bar；Wherein, first grip block, the second grip block opposite face be tilt
Face.
Preferably：It is provided with nylon rod on the inclined surface.
Preferably：The telescopic device is cylinder, is connected by female part between the cylinder and the clamping piece；It is described
First grip block, the second grip block are connected on the female part, and the tailpiece of the piston rod of cylinder is connect with lead screw is oriented to, the guiding
Lead screw stretches out the sunk area of the female part, and the first fastening nut, the second fastening nut are set on the guiding lead screw,
First fastening nut, the second fastening nut are located at the both sides of the sunk area.
Preferably：Guide rail is additionally provided on the level board, the end of the female part is slidably matched with the guide rail.
Preferably：In first guide through hole, the second guide through hole, third guide through hole, the 4th guide through hole
It is arranged with guide sleeve.
Preferably：The upper and lower ends of the bearing side offer upper installing hole, lower mounting hole respectively；The upper guide pad
In the end set of one end that is connect with the bearing side have upper screw rod, connect with the bearing side in the lower mounting bar
The end set of one end have lower screw rod；The upper screw rod stretches out the upper installing hole, and is arranged on the upper screw rod
First nut, upper second nut；Upper first nut, upper second nut are located at the both sides of the upper installing hole；It is described
Lower screw rod stretches out the lower mounting hole, and lower first nut, lower second nut are arranged on the lower screw rod；Described lower first
Nut, lower second nut are located at the both sides of the lower mounting hole.
Preferably：The bottom of the level board is provided with substrate；It is provided in the level board and runs through from top to bottom
Level board pilot hole, the guide direction of the level board pilot hole and the lower mounting bar are radial parallel；On the substrate
It is provided with screw thread slot, the screw rod end of bolt is stretched to across the level board pilot hole in the screw thread slot.
Preferably：The level board pilot hole is kidney-shaped counterbore.
The advantage of the invention is that：The present invention is risen by the way that piston to be processed is placed in mounting bar in a manner of interspersed
To the effect for facilitating installation.Due to opening up the first guide through hole, the second guide through hole on upper guide pad, on lower mounting bar on
Third guide through hole, the 4th guide through hole are opened up, by the guiding role of guide through hole, facilitates the alignment of drill bit, improves processing
Precision, compared with prior art, avoid due to caused by bit vibration, swing processing tilt, elliptic pin hole seat eye
Appearance.By the clamping action for the clamp assemblies that stretch, the stationarity of piston to be processed in jewel hole is improved, is prevented because of machinery
The phenomenon that shaking caused piston displacement and leading to the pin hole seat eye position deviation of processing.
Further, since piston is cylindrical shape, cross section is circle, and traditional clamping piece such as uses two pieces of symmetric design
Tablet de-clamping piston, in the phenomenon that clamping in actual work, can be caused unstable.And the clamping piece with inclined surface, can be in eight
Piston to be processed is clamped in font so that clamping effect more fastens.
Further, nylon rod can generate deformation, avoid, in clamping, contacting between grip block and piston, in work
It is generated on the outer wall of plug and squeezes trace or due to rigid contact, it is difficult to fasten piston.
Further, it is arranged in the first guide through hole, the second guide through hole, third guide through hole, the 4th guide through hole
There is guide sleeve.Guide sleeve is preferably rubber sleeve.When using drill bit in this way, would not occur swinging larger, further prevent occurring
The phenomenon that elliptic pin hole seat eye.
Further, it by pushing level board, can realize in the guide range of level board pilot hole along lower mounting bar
It radially slides, to realize the adjustment of horizontal Board position.
Description of the drawings
Fig. 1 is the topology example figure of the present invention.
Fig. 2 is stereogram guide locating device provided in the present invention.
Fig. 3 is side structure schematic diagram guide locating device provided in the present invention.
Fig. 4 is the guide locating device provided structural schematic diagram under vertical view state in the present invention.
Specific implementation mode
To further describe the present invention, it is described further with reference to embodiment.
As shown in Figs 1-4, the present embodiment includes double drill bit drilling machines, further includes guide locating device provided, guide locating device provided packet
Include level board 2, bearing 3, upper guide pad 4, lower mounting bar 5, flexible clamp assemblies on Drilling machines bench.Bearing 3 perpendicular to
Level board 2 and be arranged on level board 2.Homonymy of the upper guide pad 4 with lower mounting bar 5 in bearing 3 is arranged.The one of upper guide pad 4
End is connect with the upper end of 3 side of bearing, and the other end of upper guide pad 4 is horizontal to extend outwardly.Lower mounting bar 5 is installing work
Plug, lower 5 one end of mounting bar are connect with the lower end of 3 side of bearing, and the other end of lower mounting bar 5 is horizontal to extend outwardly.It is leading
The first guide through hole 61 penetrated through from top to bottom, the second guide through hole 62 are offered on block 4.It is provided on lower mounting bar 5
The corresponding third guide through hole 71 of penetrate through from top to bottom and the first guide through hole 61, with the second guide through hole 62 the corresponding 4th
Guide through hole 72.Flexible clamp assemblies include telescopic device 81, clamping piece.The telescopic end of telescopic device 81 is connect with clamping piece,
Clamping piece is to clamp piston.
In order to ensure the accurate realization of jewel hole, a drill bit 11 and the first guide through hole 61 in two drill bits of the invention,
Third guide through hole 71 corresponds to, another drill bit 12 and the second guide through hole 62, the 4th guide through hole 72.
The present invention ensures opening for piston by penetrating two pin holes of piston 100 to be processed into lower mounting bar 5
Mouthful end upward, top down.To which piston to be processed to be placed in lower mounting bar 5, in order to further increase the flat of placement
Stability can be such that 100 top of piston of processing is contacted with level board 2.The position of piston 100 to be processed is adjusted, ensures third
Guide through hole 71 is corresponding with the center of a pin hole seat in piston 100 to be processed, the 4th guide through hole 72 with it is to be processed
The center of another pin hole seat in piston 100 corresponds to.At this point, starting telescopic device 81, its telescopic end is made to extend, drives clamping
Part elongation is until clamping piece clamps the side of piston 100 to be processed.Start double drill bit drilling machines, ensures that two drill bits are worn respectively
The first guide through hole 61, the second guide through hole 62 are crossed, respectively to being bored at the top of two pin hole seats of piston 100 to be processed
, after the completion of jewel hole, two drill bits are each passed through third guide through hole 71, the 4th guide through hole 72, then to piston to be processed
The bottom of 100 two pin hole seats carries out jewel hole, completes jewel hole technique.
The present invention plays the effect for facilitating installation by the way that piston to be processed is placed in mounting bar 5 in a manner of interspersed.
Due to opening up the first guide through hole 61, the second guide through hole 62 on upper guide pad 4, on lower mounting bar 5 on open up third and lead
The alignment of drill bit is facilitated by the guiding role of guide through hole to through-hole 71, the 4th guide through hole 72, improves the accurate of processing
Degree is avoided due to processing inclination, the appearance of elliptic pin hole seat eye caused by bit vibration, swing compared with prior art.
By the clamping action for the clamp assemblies that stretch, the stationarity of piston to be processed in jewel hole is improved, prevents from leading because of mechanical shock
The piston displacement of cause and cause processing pin hole seat eye position deviation the phenomenon that.
In some embodiments：Clamping piece includes the first grip block 821, the second grip block 822.First grip block 821,
Two grip blocks 822 are oppositely arranged on the both sides of lower mounting bar 5.Wherein, the opposite face of the first grip block 821, the second grip block 822
It is inclined surface.
Since piston is cylindrical shape, cross section is circle, and traditional clamping piece is such as gone with two pieces of tablets of symmetric design
Clamp piston, in the phenomenon that clamping in actual work, can be caused unstable.And the clamping piece with inclined surface, can be in that splayed is pressed from both sides
Hold piston to be processed so that clamping effect more fastens.
In some embodiments：Nylon rod 83 or rubber bar are provided on inclined surface.
Nylon rod, plastic rod can generate certain deformation, avoid, in clamping, contacting between grip block and piston, in work
It is generated on the outer wall of plug and squeezes trace；Or due to rigid contact, it is difficult to fasten piston.
In some embodiments：Telescopic device 81 is cylinder, is connected by female part 89 between cylinder and clamping piece.First
Grip block 821, the second grip block 822 are connected on female part 89, and the tailpiece of the piston rod of cylinder is connect with lead screw 84 is oriented to, guide wire
Bar 84 stretches out the sunk area of female part 89, and the first fastening nut (not indicated in figure), the are set on being oriented to lead screw 84
Two fastening nuts (do not indicate) in figure, and the first fastening nut, the second fastening nut are located at the both sides of sunk area.
By tightening the first fastening nut, the second fastening nut so that the first fastening nut, the second fastening nut are pressed respectively
The two sides of tight sunk area, to realize that being oriented to lead screw 84 is fastened on female part 89.The piston rod movement drive of cylinder is led
It is moved to lead screw 84, is oriented to the movement of lead screw 84 and female part 89 is driven to move, the movement of female part 89 drives the first grip block 821, the
Two grip blocks 822 move.Connection type using the present invention, meeting clamping piece and on the basis of being detachably connected of cylinder,
It can realize the accuracy that clamping piece is combined with cylinder.
In some embodiments：Guide rail 9 is additionally provided on level board 2, end and the sliding of guide rail 9 of female part 89 are matched
It closes.The setting of guide rail 9 can meet the consistency of 89 each movement locus of female part, guard against deviations.
In some embodiments：It is led in the first guide through hole 61, the second guide through hole 62, third guide through hole the 71, the 4th
Guide sleeve 10 is arranged with into through-hole 72.Guide sleeve 10 is preferably rubber sleeve.When using drill bit in this way, it would not swing
It is larger, further prevent the phenomenon that elliptic pin hole seat eye occur.
In some embodiments：The upper and lower ends of 3 side of bearing offer upper installing hole, lower mounting hole respectively.Upper guiding
The end set of the one end being connect with 3 side of bearing in block 4 has upper screw rod 101, is connect with 3 side of bearing in lower mounting bar 5
The end set of one end has lower screw rod 102.Upper screw rod 101 stretches out upper installing hole, and upper first spiral shell is arranged on upper screw rod 101
Mother 103, upper second nut 104.Upper first nut 103, upper second nut 104 are located at the both sides of upper installing hole.Lower screw rod
102 stretch out lower mounting hole, and lower first nut 105, lower second nut 106 are arranged on lower screw rod 102.Lower first nut
105, lower second nut 106 is located at the both sides of lower mounting hole.
The present invention upper first nut 103, upper second nut 104 match close screw rod 101 be for fastening upper guide pad 4,
Screw rod 102 is for fastening lower mounting bar 5 under lower first nut 105, lower second nut 106 cooperation.Due to the first of the present invention
Nut, upper second nut 104 match the work for closing screw rod 101 and screw rod 102 under lower first nut 105, lower second nut 106 cooperation
Identical with, principle, the first nut that the present invention is directed to, upper second nut 104 are introduced with closing screw rod 101.
The present invention is by tightening upper first nut 103, upper second nut 104 so that upper first nut 103, upper second spiral shell
Mother 104 is pressed on the both sides of upper installing hole, and the friction increased between upper first nut 103, upper second nut 104 and bearing 3 is imitated
Fruit, thus by 4 Quick fastening of upper guide pad on bearing 3.
In some embodiments：The bottom of level board 2 is provided with substrate 107.It is provided with from top to bottom in level board 2
Perforative level board pilot hole 109, the guide direction of level board pilot hole 109 and lower mounting bar 5 are radial parallel.In substrate 107
On be provided with screw thread slot, the screw rod end of bolt 108 is stretched to across level board pilot hole 109 in screw thread slot.
By tightening bolt 108 so that level board is realized at the both ends of the head level of compression plate pilot hole 109 of bolt 108
Fastening between 2 and substrate 107.By unscrewing bolt 108 so that the head of bolt 108 is detached from the two of level board pilot hole 109
End realizes that level board 2 can be the activity relatively between substrate 107.By pushing level board 2, can realize in level board pilot hole
Radially sliding along lower mounting bar 5 in 109 guide range, to realize the adjustment of 2 position of level board.
In some embodiments：Level board pilot hole 109 is kidney-shaped counterbore.The head that counterbore can meet bolt 108 is abundant
Embedment is wherein.
The preferred embodiment that these are only the invention is not intended to limit the invention creation, all in the present invention
All any modification, equivalent and improvement etc., should be included in the guarantor of the invention made by within the spirit and principle of creation
Within the scope of shield.
Claims (9)
1. a kind of piston-pin boss eye processing unit (plant), including double drill bit drilling machines, it is characterised in that：Further include being arranged in the drilling machine
Level board, bearing, upper guide pad, lower mounting bar, flexible clamp assemblies on workbench；The bearing is perpendicular to the level board
And it is arranged on the level board；Homonymy of the upper guide pad with the lower mounting bar in the bearing is arranged；It is led on described
It is connect to one end of block with the upper end of the bearing side, the other end of the upper guide pad is horizontal to extend outwardly；It is described
To install piston, one end is connect lower mounting bar with the lower end of the bearing side, and the other end of the lower mounting bar is in water
It is flat-shaped to extend outwardly；The first guide through hole penetrated through from top to bottom, the second guide through hole are offered in the upper guide pad；Institute
It states and is provided with the third guide through hole corresponding with first guide through hole penetrated through from top to bottom on lower mounting bar, with described the
Corresponding 4th guide through hole of two guide through hole；The flexible clamp assemblies include telescopic device, clamping piece；The telescopic device
Telescopic end connect with the clamping piece, the clamping piece is to clamp piston.
2. a kind of piston-pin boss eye processing unit (plant) according to claim 1, it is characterised in that：The clamping piece includes the
One grip block, the second grip block；First grip block, the second grip block are oppositely arranged on the both sides of the lower mounting bar；Its
In, first grip block, the second grip block opposite face be inclined surface.
3. a kind of piston-pin boss eye processing unit (plant) according to claim 2, it is characterised in that：It is arranged on the inclined surface
There is nylon rod.
4. a kind of piston-pin boss eye processing unit (plant) according to claim 2, it is characterised in that：The telescopic device is gas
Cylinder is connected between the cylinder and the clamping piece by female part；First grip block, the second grip block are connected to described
On female part, the tailpiece of the piston rod of cylinder is connect with lead screw is oriented to, the sunk area for being oriented to lead screw and stretching out the female part,
The first fastening nut, the second fastening nut, first fastening nut, the second fastening nut are arranged on the guiding lead screw
It is located at the both sides of the sunk area.
5. a kind of piston-pin boss eye processing unit (plant) according to claim 4, it is characterised in that：On the level board also
It is provided with guide rail, the end of the female part is slidably matched with the guide rail.
6. a kind of piston-pin boss eye processing unit (plant) according to claim 1, it is characterised in that：It is oriented to described first logical
It is arranged with guide sleeve in hole, the second guide through hole, third guide through hole, the 4th guide through hole.
7. a kind of piston-pin boss eye processing unit (plant) according to claim 1, it is characterised in that：The bearing side it is upper
Lower both ends offer upper installing hole, lower mounting hole respectively；The end of the one end being connect with the bearing side in the upper guide pad
Portion is provided with screw rod, and the end set of the one end being connect with the bearing side in the lower mounting bar has lower screw rod；It is described
Upper screw rod stretches out the upper installing hole, and upper first nut, upper second nut are arranged on the upper screw rod；Described upper first
Nut, upper second nut are located at the both sides of the upper installing hole；The lower screw rod stretches out the lower mounting hole, and described
The first nut, lower second nut are arranged with down on lower screw rod；Lower first nut, lower second nut are located at the lower peace
Fill the both sides in hole.
8. a kind of piston-pin boss eye processing unit (plant) according to claim 1, it is characterised in that：At the bottom of the level board
Portion is provided with substrate；Perforative level board pilot hole from top to bottom, the level board pilot hole are provided in the level board
Guide direction and the lower mounting bar it is radial parallel；It is provided with screw thread slot on the substrate, the screw rod end of bolt passes through
The level board pilot hole stretches in the screw thread slot.
9. a kind of piston-pin boss eye processing unit (plant) according to claim 8, it is characterised in that：The level board pilot hole
For kidney-shaped counterbore.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610965681.4A CN106346038B (en) | 2016-10-28 | 2016-10-28 | A kind of piston-pin boss eye processing unit (plant) |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610965681.4A CN106346038B (en) | 2016-10-28 | 2016-10-28 | A kind of piston-pin boss eye processing unit (plant) |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106346038A CN106346038A (en) | 2017-01-25 |
| CN106346038B true CN106346038B (en) | 2018-08-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610965681.4A Active CN106346038B (en) | 2016-10-28 | 2016-10-28 | A kind of piston-pin boss eye processing unit (plant) |
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Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3283083B2 (en) * | 1992-12-25 | 2002-05-20 | 本田技研工業株式会社 | Positioning device for piston pin press fit |
| JP4294789B2 (en) * | 1999-05-07 | 2009-07-15 | 本田技研工業株式会社 | Piston pin clip insertion device |
| KR100730783B1 (en) * | 2006-08-29 | 2007-06-20 | 동양피스톤 주식회사 | Finishing machine for pinhole of piston |
| CN201931293U (en) * | 2010-12-24 | 2011-08-17 | 湖南江滨机器（集团）有限责任公司 | Clamp for processing piston |
| CN202701439U (en) * | 2012-08-12 | 2013-01-30 | 宁波恒力汽配轴承有限公司 | Double-drill-head digital controlled drill |
| EP2898209A1 (en) * | 2012-09-18 | 2015-07-29 | Federal-Mogul Corporation | Steel piston with counter-bore design |
| CN103949690A (en) * | 2014-04-14 | 2014-07-30 | 宁波狮球通风机电有限公司 | Housing drill |
| CN204524781U (en) * | 2015-03-10 | 2015-08-05 | 重庆奥秘活塞有限公司 | A kind of piston in combination machining tool |
| CN105436552B (en) * | 2015-12-16 | 2018-06-26 | 宁国市嘉翔机械有限公司 | A kind of U-joint drilling device |
| CN205496976U (en) * | 2016-04-21 | 2016-08-24 | 瑞安市永飞摩擦材料有限公司 | Compound processing equipment of piston body |
-
2016
- 2016-10-28 CN CN201610965681.4A patent/CN106346038B/en active Active
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| CN106346038A (en) | 2017-01-25 |
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