EP3870391A1 - Machine de segmentation de piston de moteur thermique - Google Patents
Machine de segmentation de piston de moteur thermiqueInfo
- Publication number
- EP3870391A1 EP3870391A1 EP19786379.8A EP19786379A EP3870391A1 EP 3870391 A1 EP3870391 A1 EP 3870391A1 EP 19786379 A EP19786379 A EP 19786379A EP 3870391 A1 EP3870391 A1 EP 3870391A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- segmentation
- height adjustment
- piston
- rod
- thp
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P19/00—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
- B23P19/04—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes for assembling or disassembling parts
- B23P19/08—Machines for placing washers, circlips, or the like on bolts or other members
- B23P19/084—Machines for placing washers, circlips, or the like on bolts or other members for placing resilient or flexible rings, e.g. O-rings, circlips
- B23P19/088—Piston rings in piston grooves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F5/00—Piston rings, e.g. associated with piston crown
Definitions
- the invention relates generally to the segmentation of the heat engine pistons, that is to say, the positioning of the segments on the heat engine pistons. More particularly, the invention relates to a piston engine segmentation machine, in particular for the segmentation in semi-automatic mode, but not exclusively.
- the piston segmentation has the function of ensuring the sealing of the piston in the cylinder of the engine.
- the segmentation prevents oil from rising to the top of the cylinder and spreads a thin film of oil on the cylinder liner to limit wear. It also contributes to the cooling of the piston head by ensuring a thermal transfer between the piston and the cooled cylinder liner.
- the segments are in the form of split rings and are generally three in number.
- the segments, marked here SC, SE and SR, are mounted on the top of the piston and fit respectively into grooves of segment Rc, RE and RR thereof.
- the segments SC, SE and SR correspond respectively to the so-called “firebreak”, “sealing” and “scraper” segments.
- the segments are elastic steel parts, thin and brittle, the positioning of which on the piston is a delicate operation.
- Piston segmentation machines of semi-automatic or fully automatic type, have been developed and are used in the production lines of heat engines of automobile manufacturers.
- a piston segmentation machine MS of semi-automatic type is shown in Figs.2 and 3.
- the piston segmentation machine MS constitutes a segmentation station and is controlled by an operator OP to ensure the establishment of a segment in a corresponding groove of the PS piston.
- the implementation of the entire segmentation therefore requires the passage of the piston PS through three segmentation stations each formed by an MS machine.
- the operator OP inserts the piston PS upside down into the opening OV of a segment insertion mechanism MIS of the machine MS.
- the segment is brought to the MIS segment insertion mechanism by a segment supply and guidance mechanism comprising a vertical segment supply column CAS and a CGS segment guide carriage.
- the CGS segment guide carriage is controlled by a longitudinal cylinder and guides the segment to be placed on the PS piston to the MIS segment insertion mechanism.
- the MIS segment insertion mechanism includes in particular a set of jaws, a guide and stops.
- the jaws are braced by the guide which forms a receptacle groove for the segment.
- the positioning of the segment in the receptacle groove is obtained by means of a stop.
- the closing of the jaws is controlled by a jack.
- the jaws are carried by a vertical elevator actuated by jack.
- a special four-jaw pliers open the jaws, extend the segment and hold the piston.
- the positioning in height of the piston PS in the MIS segment insertion mechanism must be ensured precisely. Indeed, the piston ring groove must be in perfect coincidence with the segment in order to ensure correct positioning of the latter. For this, a segmentation height adjustment device is provided in the MIS segment insertion mechanism.
- the segmentation height adjustment device in particular comprises a vertical rod TH and a height adjustment stop BH which allows adjustment for a segmentation height of the piston.
- the segmentation height for a considered segment of the piston is defined here as the distance between the bottom of the combustion bowl of the piston head and the corresponding segment groove of the piston.
- the piston segmentation machine MS is dedicated to the installation of the scraper segment SR of the piston PS.
- scraper segment SR corresponds to a segmentation height HR.
- the vertical rod TH keeping the same length from one machine MS to another, it is the height adjustment stop BH which is calibrated to obtain an alignment between the position of the scraper segment SR and that of the corresponding segment groove of the piston PS, when the piston PS is in place, that is to say, pressing on the top of the vertical rod TH, as shown in Fig.4.
- the height adjustment stop BH is therefore calibrated differently depending on whether the machine MS is dedicated to the installation of the firebreak segment SC, of the sealing segment SE or of the scraper segment SR.
- the invention relates to a piston engine segmentation machine of a heat engine comprising a mechanism for positioning the segment on the piston and a mechanism for supplying and guiding the segment, the mechanism for installing piston ring comprising a segmentation height adjustment device having a segmentation height adjustment rod whose upper end is arranged for contact with a piston head.
- the segmentation height adjustment device comprises means for automatically adjusting a plurality of segmentation heights, in combination with the segmentation height adjustment rod and arranged to determine the position of the upper end of the segmentation height adjustment rod.
- the means for adjusting a plurality of segmentation heights comprise a rotary module having several stops for segmentation height adjustment arranged in a circle and movable around a central axis of rotation, each of the stops segmentation height adjustment having a calibrated height.
- the rotary module comprises a rotary indexing table with pneumatic control having several angular positions corresponding respectively to the multiple stops for adjusting the segmentation height.
- the rotary module comprises six stops for adjusting the segmentation height and the indexable rotary table with pneumatic control comprises six angular positions corresponding respectively to six stops for adjusting the segmentation height.
- the pneumatically controlled indexing rotary table comprises at least one inductive sensor and / or a plurality of inductive sensors in combination used for controlling the angular position of the rotary table.
- the segmentation height adjustment device comprises a guide and rod suspension mechanism which is associated with the segmentation height adjustment rod.
- the guide mechanism and rod suspension comprises at least one compression spring.
- the segmentation height adjustment device comprises a pneumatic leakage sensor which is fixed to a lower end of the segmentation height adjustment rod so as to detecting a contact between the lower end and a said segmentation height adjustment stop.
- FIG. 1 is a perspective view showing a heat engine piston and its segments
- FIG. 2 is a schematic view showing an operator on a work station equipped with a piston engine segmentation machine
- FIG. 3 is a sectional view showing a piston engine segmentation machine according to the prior art
- FIG. 4 is a partial sectional view showing a piston resting on a segmentation height adjustment rod of the piston engine segmentation machine of FIG. 3;
- FIG. 5 is a partial perspective view showing a particular embodiment of a piston engine segmentation machine according to the invention.
- FIG. 6 is a perspective view of a rotary module with several segmentation height adjustment stops included in the piston engine segmentation machine of FIG. 5;
- FIG. 7 is a perspective view of a segmentation height adjustment device included in the piston engine segmentation machine of FIG. 5 and including the rotary module of FIG. 6.
- the piston engine MSP segmentation machine according to the invention differs from the machine MS of the prior art by its RHP segmentation height adjustment device.
- the RHP segmentation height adjustment device allows several preset segmentation heights and an easy change from one segmentation height to another.
- the RHP segmentation height adjustment device comprises a rotary module MR with several stops for segmentation height adjustment.
- the RHP segmentation height adjustment device also comprises a vertical segmentation height adjustment rod THP, movable vertically in translation, extending between a stop of the rotary module MR and the head of the piston PS (in a similar manner to the vertical rod TH in Fig. 4) and a guide and suspension mechanism of the GS rod associated with the THP rod.
- THP vertical segmentation height adjustment rod
- the rotary module MR is fixed on a plate forming a support PL of the piston segmentation machine of the heat engine MSP, in a lower part of a frame thereof.
- the rotary module MR here comprises six stops B1 to B6 for adjusting the segmentation height.
- the stops B1 to B6 are arranged in a circle around a central axis of rotation A, being fixed on a rotary annular plate PA of the module MR.
- the stops B1 to B6 have different calibrated heights and allow adjustment of segmentation heights H1 to H6, respectively.
- the rotary annular plate PA is a pneumatically controlled indexing plate here having six angular positions corresponding respectively to the six stops B1 to B6 for adjusting the segmentation height.
- one or more inductive sensors in combination can be used for the angular position control.
- an electric motor can be used with an angular position control command.
- the RHP segmentation height adjustment device is adjusted on the stop B4, the latter being in position under the lower end of the THP segmentation height adjustment rod.
- pneumatic contact detection means are associated with the rotary module MR.
- the contact between the lower end of the segmentation height adjustment rod THP and the corresponding stop is detected pneumatically.
- a pneumatic CF leakage sensor (Fig. 7) is mounted at the lower end of the THP segmentation height adjustment rod.
- the contact signal detected by the pneumatic leakage sensor CF, from the lower end of the THP rod on the stop is used with other sensor information (electronic, optical or other types), for general control of the MSP combustion engine piston segmentation machine.
- pneumatic control boxes as well as other possible control devices, such as electrical and electronic circuits, may be installed in the lower part of the frame of the MSP machine, as shown in FIG. 5 ( devices marked CD).
- the guide mechanism and rod suspension GS has a vertical structure in inverted U, having two guide columns C1 and C2 and a high cross bar BTH.
- the guide posts C1 and C2 are arranged vertically, in parallel, and fixed by their respective bases to a support plate of the RHP segmentation height adjustment device.
- the high cross bar BTH is fixed on the high ends of the guide posts C1 and C2.
- a guide bearing PG is arranged in the upper transverse bar BTH, at equal distance between the guide posts C1 and C2.
- the segmentation height adjustment rod THP is inserted into the guide bearing PG.
- the PG guide bearing participates in a vertical sliding guide of the THP rod.
- the vertical sliding guide of the THP rod is completed by means of a BTG guide transverse bar which is integral with the THP rod.
- the BTG guide crossbar is fixed to the THP rod which crosses it perpendicularly at its center.
- BTG guide crossbar is mounted sliding between the guide posts C1 and C2, by means of guide bores A1 and A2 arranged at its two opposite ends.
- Compression springs R1 and R2 are mounted respectively on the guide posts C1 and C2 and are compressed by the descent of the guide cross bar BTG.
- the compression springs R1 and R2 allow the THP segmentation height adjustment rod to be pushed upwards when no pushing down force is exerted on it.
- the upward movement of the THP rod frees up space around the stops B1 to B6 for rotation of the latter.
- the compression springs R1 and R2 also have the function of damping the descent of the THP rod and contact with the stop in place during segmentation operations.
- the rotary module MR with several segmentation height adjustment stops may be replaced by a cylinder actuated in different positions corresponding to the different desired segmentation heights.
- an electric actuator can be used.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Automatic Assembly (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1871292A FR3087845B1 (fr) | 2018-10-24 | 2018-10-24 | Machine de segmentation de piston de moteur thermique |
| PCT/FR2019/052088 WO2020084205A1 (fr) | 2018-10-24 | 2019-09-10 | Machine de segmentation de piston de moteur thermique |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3870391A1 true EP3870391A1 (fr) | 2021-09-01 |
Family
ID=65444255
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19786379.8A Withdrawn EP3870391A1 (fr) | 2018-10-24 | 2019-09-10 | Machine de segmentation de piston de moteur thermique |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP3870391A1 (fr) |
| FR (1) | FR3087845B1 (fr) |
| WO (1) | WO2020084205A1 (fr) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54137174A (en) * | 1978-04-18 | 1979-10-24 | Honda Motor Co Ltd | Method of slidingly fitting a set oil ring to a piston in an internal combusion engine |
| JP2564912B2 (ja) * | 1988-09-09 | 1996-12-18 | いすゞ自動車株式会社 | ピストンリング組付機 |
| US5404629A (en) * | 1993-10-15 | 1995-04-11 | Micro-Precision Operations, Inc. | Piston ring apparatus |
| JP3322039B2 (ja) * | 1994-10-26 | 2002-09-09 | いすゞ自動車株式会社 | ピストンリング自動組付装置 |
| JP4004295B2 (ja) * | 2002-01-25 | 2007-11-07 | 株式会社クボタ | ピストンリング自動組付装置 |
-
2018
- 2018-10-24 FR FR1871292A patent/FR3087845B1/fr active Active
-
2019
- 2019-09-10 WO PCT/FR2019/052088 patent/WO2020084205A1/fr not_active Ceased
- 2019-09-10 EP EP19786379.8A patent/EP3870391A1/fr not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| FR3087845B1 (fr) | 2022-02-11 |
| FR3087845A1 (fr) | 2020-05-01 |
| WO2020084205A1 (fr) | 2020-04-30 |
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Legal Events
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Owner name: STELLANTIS AUTO SAS |
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| 18D | Application deemed to be withdrawn |
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