CN104669199A - Special tooling and method for mounting two-stroke engine pistons into cylinder bodies - Google Patents
Special tooling and method for mounting two-stroke engine pistons into cylinder bodies Download PDFInfo
- Publication number
- CN104669199A CN104669199A CN201510082921.1A CN201510082921A CN104669199A CN 104669199 A CN104669199 A CN 104669199A CN 201510082921 A CN201510082921 A CN 201510082921A CN 104669199 A CN104669199 A CN 104669199A
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- China
- Prior art keywords
- piston
- cylinder body
- arc clamp
- gag lever
- lever post
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
- B25B27/02—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B11/00—Work holders not covered by any preceding group in the subclass, e.g. magnetic work holders, vacuum work holders
- B25B11/02—Assembly jigs
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
The invention discloses a special tooling for mounting two-stroke engine pistons into cylinder bodies, which comprises a support base, a pair of limit rods, a horizontal piston support plate and two arc-shaped clamping plates, and the horizontal piston support plate which is located under the pair of limit rods is fixed on a vertical plate. The invention also discloses the using method of the special tooling, which includes the following steps: (1) a piston, a connecting rod and front and rear crankcases are mounted into the support base together, the connecting rod is inserted into a notch of the horizontal piston support plate, and the lower part of the piston is located inside the pair of limit rods; (2) an operator respectively embeds the lower ends of the two arc-shaped clamping plates into the gaps between the pair of limit rods and the outer circle of the piston; (3) the operator uses the other hand to take up and aim a cylinder body at the piston and downwardly press the cylinder body until the piston is pressed into the cylinder body. The structure of the special tooling disclosed by the invention is simple, and the assembly method is safe and highly efficient. Thereby the piston assembly of two-stroke engines is simpler, easier and safer, mistakes cannot be easily made, consequently, the damage rate of piston assembly is decreased, and the efficiency of production is increased.
Description
Technical field
The present invention relates to a kind of assembly tooling of brush cutter two-cycle engine, particularly relate to the special tooling that a kind of two-stroke engine piston loads cylinder body, belong to compact internal combustion engine mounting technology field.
Background technology
Brush cutter is a kind of small mower, is also called shoulder carrying mower, can bear and can carry by hand during use, be mainly used for large area lawn mow after play a minor role or prune withered grass shrub, its use petrol engine be small-sized two-cycle engine.Put in the process of cylinder body at two-stroke engine piston, usual employing first by the Piston assembling of ring plugging on crankshaft-link rod assembly, then the crankshaft-link rod assembly integral installation be connected with piston is entered front and back crankcase, finally just piston is loaded in cylinder body.But there is following problem in this assembling mode:
1, two piston rings be contained in respectively in piston ring groove axially all obtain spacing, but its radial direction is still in free state, cause piston ring external diameter to be greater than cylinder diameter, during assembling, piston ring excircle must be pinned with strength with finger, force piston ring excircle diameter to be less than cylinder diameter, piston could be loaded in cylinder body.Owing to being provided with scavenging air belt in cylinder body, whole cylinder body is made not to be a complete annulus, the scavenging air belt breach seized piston ring often on both sides, for environment-friendly type cylinder body (scavenging air belt is divided to be opened), partition in the middle of scavenging air belt almost cannot make piston ring and piston smoothly enter cylinder body, and assembly difficulty is larger; And repeatedly pin piston ring for a long time, operator feels comparatively painstaking, affects efficiency of assembling.
2, because now piston is connected with front and back crankcase, operation is heavy, dumb.
3, two piston rings aperture position must with the straight pin position consistency of two on piston ring groove, slightly
Have accidentally, gap-clearance of piston rings position may depart from straight pin, causes follow-up assembling unsuccessfully.
4, operative employee relies on hand assembled completely, operates careless slightly, may sharply be located incised wound by casing.
Summary of the invention
The object of this invention is to provide that a kind of structure is simple, handling safety and the two-stroke engine piston improving efficiency of assembling loads cylinder body special tooling and method.
The present invention is achieved by the following technical programs:
A kind of two-stroke engine piston loads cylinder body special tooling, comprise supporting seat, a pair gag lever post, piston horizontal supporting plate and two pieces of arc clamp clips, described supporting seat is L-shaped, comprise and be vertically fixedly connected with integral riser and base plate, a pair gag lever post is horizontally fixed on riser upper end, gag lever post overlaps flexible cover, the piston horizontal supporting plate be positioned on the downside of a pair gag lever post is fixed on riser; During assembling, the piston be connected with connecting rod is positioned within a pair gag lever post, and two pieces of arc clamp clip lower ends that symmetry clamps outside piston are inlaid between resilient sleeve outside a pair gag lever post and piston.
Object of the present invention can also be realized further by following technical measures.
Aforesaid two-stroke engine piston loads cylinder body special tooling, and wherein piston gripper shoe front end has the prong allowing the connecting rod of piston to enter, and described prong front end is toroidal.Both sides, piston gripper shoe front end are respectively equipped with the recess that arc clamp clip falls.Both sides, piston gripper shoe front end are respectively equipped with the recess that arc clamp clip falls.
Aforesaid two-stroke engine piston loads cylinder body special tooling, and wherein the height h of arc clamp clip is less than depth pistion H, and arc clamp clip medial surface covers the twice piston ring being inlaid in piston upper end.The material of arc clamp clip is medium carbon steel, and the heat treatment hardness of arc clamp clip is HRc35 ~ 45, and the surface roughness of arc clamp clip inside and outside circle cambered surface is 1.6 ~ 0.8.
Two-stroke engine piston loads a method for cylinder body, comprises the following steps:
1) piston, connecting rod are put in supporting seat together with front and back crankcase, and on the upside of the base plate making to be supported on the downside of the crankcase of front and back supporting seat, the connecting rod of piston underside injects in the prong of piston gripper shoe, and piston lower portion is positioned within a pair gag lever post on the upside of piston gripper shoe;
2) operative employee's symmetrical two pieces of arc clamp clips clamped outside piston of two fingers on the other hand, the upper side of two pieces of arc clamp clips is all lower than piston-top surface, and the medial surface of two pieces of arc clamp clips covers the twice piston ring of piston upper end completely, then two pieces of arc clamp clip lower ends are embedded respectively in the space between resilient sleeve outside a pair gag lever post and outside piston; The part that the position completion cylinder base piston hole guide section of two pieces of arc clamp clips lacks;
3) operative employee presses down with another hand-held cylinder body aligning piston, until in piston press-in cylinder body, two fingers unclamp, cylinder body lower surface promotes two pieces of arc clamp clips and falls to the base plate of supporting seat from both sides, piston gripper shoe front end recess respectively, treat that two piston rings on the upside of piston enter in cylinder body completely, thus complete the assembling of piston loading cylinder body, finally cylinder body, connecting rod are pulled out from supporting seat together with front and back crankcase.
Aforesaid two-stroke engine piston loads the method for cylinder body, and wherein the distance A of piston underside face and gag lever post axis is 1/4 ~ 1/3 of depth pistion H.
Special tooling structure of the present invention is simple, and assembly method is safe and efficient.During assembling, hand-held a pair arc clamp clip upper end clamping piston, utilizes resilient sleeve on gag lever post to the pressure of arc clamp clip lower end simultaneously, and after piston ring is shunk, its outside diameter is slightly less than cylinder diameter, thus piston can be pressed in cylinder body smoothly.Scavenging air belt due to the cylinder body of two-cycle engine causes whole cylinder body not to be a complete annulus, the divided partition opened in the middle of environment-friendly type cylinder body scavenging air belt of the scavenging air belt breach seized piston ring often on both sides, especially scavenging air belt makes the piston ring on piston and piston almost smoothly cannot enter cylinder body.And the present invention adopts the assembly method of a pair arc clamp clip clamping piston to solve an above-mentioned difficult problem, make the Piston assembling of two-cycle engine more simply, more easily, also safer, not easily make mistakes, thus lower the spoilage of Piston assembling, improve production efficiency.
Advantage and disadvantage of the present invention, by for illustration and explanation for the non-limitative illustration passing through preferred embodiment below, these embodiments, only provide as an example with reference to accompanying drawing.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of special tooling structure of the present invention and assembly method;
Fig. 2 is the left view of Fig. 1;
Fig. 3 is the top view of Fig. 1.
Detailed description of the invention
Below in conjunction with drawings and Examples, the invention will be further described.
As shown in FIG. 1 to 3, special tooling of the present invention comprises supporting seat 1, a pair gag lever post 2, piston horizontal supporting plate 3 and two pieces of arc clamp clips 4, supporting seat 1 is L-shaped, comprise and be vertically fixedly connected with integral riser 11 and base plate 12 by trip bolt 101,4 pieces of cushion blocks 13 are also provided with, to adapt to the needs that front and back crankcase 5 is located bottom base plate 12.A pair gag lever post 2 is horizontally fixed on riser 11 upper end, gag lever post 2 overlaps flexible cover 21, can provide the pressure to arc clamp clip 4 lower end, is convenient to push down piston ring 71.
The piston horizontal supporting plate 3 be positioned on the downside of a pair gag lever post 2 is fixed on riser 11.Piston horizontal supporting plate 3 can limit bent axle and drive piston 7 to move, and makes piston 7 be in the position of the slightly downward 1mm of top dead centre, and bears cylinder body 8 and press a part of load passing to piston 7 during piston 7.During assembling, the piston 7 be connected with connecting rod 6 is positioned within a pair gag lever post 2, and two pieces of arc clamp clip 4 lower ends that symmetry clamps piston 7 cylindrical are inlaid between resilient sleeve 21 outside a pair gag lever post 2 and piston 7.
As shown in Figure 3, piston gripper shoe 3 front end has the prong 31 allowing the connecting rod 6 of piston 7 lower end to enter, and described prong 31 front end is toroidal, is convenient to move the connecting rod 6 entering prong 31 lead.Both sides, piston gripper shoe 3 front end are respectively equipped with the recess 32 that arc clamp clip 4 falls, and are convenient to enter cylinder body 8 rear arc clamp clip 4 at piston 7 and can depart from piston 7 in time and fall through recess 32.
The height h of arc clamp clip 4 is less than piston 7 height H, and arc clamp clip 4 medial surface covers the twice piston ring 71 being inlaid in piston 7 upper end, piston 7 head so just can be allowed to enter cylinder body 8 smoothly fast, can ensure that again two piston rings 71 all shrink, facilitate follow-up piston 7 to be all pressed in cylinder body 8.Owing to assembling piston 7 each time, arc clamp clip 4 all has relative movement with piston 7 and piston ring 71, therefore the material of arc clamp clip 4 is medium carbon steel, and its heat treatment hardness is HRc35 ~ 45, and the surface roughness of arc clamp clip 4 inside and outside circle cambered surface is 1.6 ~ 0.8.
As shown in Figure 1, two-stroke engine piston of the present invention loads the method for cylinder body, comprises the following steps:
1) piston 7, connecting rod 6 are put in supporting seat 1 together with front and back crankcase 5, and on the upside of the base plate 12 making to be supported on the downside of front and back crankcase 5 supporting seat 1, connecting rod 6 on the downside of piston 7 injects in the prong 31 of piston gripper shoe 3, and piston 7 bottom is positioned within a pair gag lever post 2 on the upside of piston gripper shoe 3;
2) operative employee points the symmetrical two pieces of arc clamp clips 4 clamped outside piston 7 with two, the upper side of two pieces of arc clamp clips 4 is all lower than piston 7 end face, and the medial surface of two pieces of arc clamp clips 4 covers the twice piston ring 71 of piston 7 upper end completely, then two pieces of arc clamp clip 4 lower ends are embedded respectively in the space between resilient sleeve 21 outside a pair gag lever post 2 and piston 7 cylindrical; The part that the position completion cylinder body 8 bottom piston hole guide section of two pieces of arc clamp clips 4 lacks;
3) operative employee aims at piston 7 with another hand-held cylinder body 10 and presses down, until piston 7 is pressed in cylinder body 10, two fingers unclamp, cylinder body 8 end face promotes two pieces of arc clamp clips 4 and falls to the base plate 12 of supporting seat 1 from both sides, piston gripper shoe 3 front end recess 32 respectively, treat that two piston rings 71 on the upside of piston 7 enter in cylinder body 8 completely, thus complete the assembling that piston 7 loads cylinder body 8, finally cylinder body 8, connecting rod 6 are pulled out from supporting seat 1 together with front and back crankcase 5.
In addition to the implementation, the present invention can also have other embodiments, and all employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop in the protection domain of application claims.
Claims (8)
1. a two-stroke engine piston loads cylinder body special tooling, it is characterized in that: comprise supporting seat, a pair gag lever post, piston horizontal supporting plate and two pieces of arc clamp clips, described supporting seat is L-shaped, comprise and be vertically fixedly connected with integral riser and base plate, a pair gag lever post is horizontally fixed on riser upper end, gag lever post overlaps flexible cover, the piston horizontal supporting plate be positioned on the downside of a pair gag lever post is fixed on riser; During assembling, the piston be connected with connecting rod is positioned within a pair gag lever post, and two pieces of arc clamp clip lower ends that symmetry clamps outside piston are inlaid between resilient sleeve outside a pair gag lever post and piston.
2. two-stroke engine piston as claimed in claim 1 loads cylinder body special tooling, it is characterized in that: piston gripper shoe front end has the prong allowing the connecting rod of piston to enter, and described prong front end is toroidal.
3. two-stroke engine piston as claimed in claim 2 loads cylinder body special tooling, it is characterized in that: both sides, piston gripper shoe front end are respectively equipped with the recess that arc clamp clip falls.
4. two-stroke engine piston as claimed in claim 1 loads cylinder body special tooling, it is characterized in that: the height h of arc clamp clip is less than depth pistion H, and arc clamp clip medial surface covers the twice piston ring being inlaid in piston upper end.
5. two-stroke engine piston as claimed in claim 1 loads cylinder body special tooling, it is characterized in that: the radius of curvature of arc clamp clip medial surface is equal with piston radius.
6. two-stroke engine piston as claimed in claim 1 loads cylinder body special tooling, it is characterized in that: the material of arc clamp clip is medium carbon steel, and the heat treatment hardness of arc clamp clip is HRc35 ~ 45, the surface roughness of arc clamp clip inside and outside circle cambered surface is 1.6 ~ 0.8.
7. two-stroke engine piston as claimed in claim 1 loads a method for cylinder body, it is characterized in that: comprise the following steps:
Piston, connecting rod are put in supporting seat together with front and back crankcase, and on the upside of the base plate making to be supported on the downside of the crankcase of front and back supporting seat, the connecting rod of piston underside injects in the prong of piston gripper shoe, and piston lower portion is positioned within a pair gag lever post on the upside of piston gripper shoe;
2) operative employee points the symmetrical two pieces of arc clamp clips clamped outside piston with two, the upper side of two pieces of arc clamp clips is all lower than piston-top surface, and the medial surface of two pieces of arc clamp clips covers the twice piston ring of piston upper end completely, then two pieces of arc clamp clip lower ends are embedded respectively in the space between resilient sleeve outside a pair gag lever post and outside piston; The part that the position completion cylinder base piston hole guide section of two pieces of arc clamp clips lacks;
3) operative employee presses down with another hand-held cylinder body aligning piston, until in piston press-in cylinder body, two fingers unclamp, cylinder body lower surface promotes two pieces of arc clamp clips and falls to the base plate of supporting seat from both sides, piston gripper shoe front end recess respectively, treat that two piston rings on the upside of piston enter in cylinder body completely, thus complete the assembling of piston loading cylinder body; Finally cylinder body, connecting rod are pulled out from supporting seat together with front and back crankcase.
8. two-stroke engine piston as claimed in claim 7 loads the method for cylinder body, and it is characterized in that: in step 1), the distance A of piston underside face and gag lever post axis is 1/4 ~ 1/3 of depth pistion H.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510082921.1A CN104669199B (en) | 2015-02-16 | 2015-02-16 | Two-stroke engine piston loads cylinder body special tooling and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510082921.1A CN104669199B (en) | 2015-02-16 | 2015-02-16 | Two-stroke engine piston loads cylinder body special tooling and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104669199A true CN104669199A (en) | 2015-06-03 |
| CN104669199B CN104669199B (en) | 2017-06-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510082921.1A Active CN104669199B (en) | 2015-02-16 | 2015-02-16 | Two-stroke engine piston loads cylinder body special tooling and method |
Country Status (1)
| Country | Link |
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| CN (1) | CN104669199B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109396836A (en) * | 2018-12-18 | 2019-03-01 | 芜湖钻石航空发动机有限公司 | Horizontal opposition type piston engine piston assembly tooling and its assembly method |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB162224A (en) * | 1920-07-30 | 1921-04-28 | Reginald Stanley Howe | An adjustable appliance for contracting piston rings of gas and oil and the like engines upon entry of pistons into cylinders |
| GB350841A (en) * | 1929-09-18 | 1931-06-18 | Frederick Bertrand West | An improved wheel drawer for use on motor vehicles |
| US5018261A (en) * | 1990-04-10 | 1991-05-28 | Markous Ezaria Y | Piston pushing tool |
| EP0559503B1 (en) * | 1992-03-03 | 1996-04-17 | Renault Automation | Device for placing rings on piston heads |
| JP2000225579A (en) * | 1999-02-05 | 2000-08-15 | Honda Motor Co Ltd | Piston inserting device |
| CN103831779A (en) * | 2012-11-23 | 2014-06-04 | 上汽通用五菱汽车股份有限公司 | Engine piston pin snap ring press fitting tool |
| CN204658314U (en) * | 2015-02-16 | 2015-09-23 | 江苏沃得植保机械有限公司 | Two-stroke engine piston packs cylinder body special tooling into |
-
2015
- 2015-02-16 CN CN201510082921.1A patent/CN104669199B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB162224A (en) * | 1920-07-30 | 1921-04-28 | Reginald Stanley Howe | An adjustable appliance for contracting piston rings of gas and oil and the like engines upon entry of pistons into cylinders |
| GB350841A (en) * | 1929-09-18 | 1931-06-18 | Frederick Bertrand West | An improved wheel drawer for use on motor vehicles |
| US5018261A (en) * | 1990-04-10 | 1991-05-28 | Markous Ezaria Y | Piston pushing tool |
| EP0559503B1 (en) * | 1992-03-03 | 1996-04-17 | Renault Automation | Device for placing rings on piston heads |
| JP2000225579A (en) * | 1999-02-05 | 2000-08-15 | Honda Motor Co Ltd | Piston inserting device |
| CN103831779A (en) * | 2012-11-23 | 2014-06-04 | 上汽通用五菱汽车股份有限公司 | Engine piston pin snap ring press fitting tool |
| CN204658314U (en) * | 2015-02-16 | 2015-09-23 | 江苏沃得植保机械有限公司 | Two-stroke engine piston packs cylinder body special tooling into |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109396836A (en) * | 2018-12-18 | 2019-03-01 | 芜湖钻石航空发动机有限公司 | Horizontal opposition type piston engine piston assembly tooling and its assembly method |
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| Publication number | Publication date |
|---|---|
| CN104669199B (en) | 2017-06-20 |
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