GB1568272A - Pistons - Google Patents
Pistons Download PDFInfo
- Publication number
- GB1568272A GB1568272A GB44009/77A GB4400977A GB1568272A GB 1568272 A GB1568272 A GB 1568272A GB 44009/77 A GB44009/77 A GB 44009/77A GB 4400977 A GB4400977 A GB 4400977A GB 1568272 A GB1568272 A GB 1568272A
- Authority
- GB
- United Kingdom
- Prior art keywords
- piston
- carrier
- heat
- resisting member
- rivets
- 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.)
- Expired
Links
- 239000000463 material Substances 0.000 claims description 9
- 229910001092 metal group alloy Inorganic materials 0.000 claims description 9
- 238000002485 combustion reaction Methods 0.000 claims description 8
- 238000009792 diffusion process Methods 0.000 claims description 5
- 238000010894 electron beam technology Methods 0.000 claims description 5
- 230000002787 reinforcement Effects 0.000 claims description 5
- 238000003466 welding Methods 0.000 claims description 5
- 238000012986 modification Methods 0.000 claims description 2
- 230000004048 modification Effects 0.000 claims description 2
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 5
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Classifications
-
- 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
- F02F3/00—Pistons
- F02F3/0015—Multi-part pistons
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2201/00—Metals
- F05C2201/02—Light metals
- F05C2201/021—Aluminium
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
- Details Of Reciprocating Pumps (AREA)
Description
(54) IMPROVEMENTS IN OR RELATING TO PISTONS
(71) We, WELLWORTHY LIMITED, a
British Company of Lymington, Hampshire,
S04 9YE, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:
The present invention relates to metal alloy pistons and more particularly, to pistons having a piston crown consisting of or comprising a heat resisting member made of a material which is more heat resistant than the metal alloy from which the remainder of the piston is made (usually an aluminium alloy).
The difference between the material of the heat-resisting member and of the metal alloy piston is usually such that the two cannot be satisfactorily bonded together.
It has previously been proposed to fit the heat-resisting member to the piston body by making the member in the form of a screw plug which is screwed into a threaded recess in the piston body or, where the heat-resisting member is a flat disc, by using a plurality of screws to screw the disc to the piston body. However the use of screw-threaded members or screws is not entirely satisfactory as it is possible for screw threads to relax and loosen under the effect of repeated heating and cooling of the piston when in operation.
It is an object of the invention to provide a piston having a heat-resisting member associated with the piston crown which avoids the necessity of employing screw threads.
According to the present invention, a metal alloy piston has a piston crown comprising a heat-resisting member and a carrier, said carrier being made of a material which is different to that of the heat-resisting member but which is bondable to the carrier being rivetted together and said carrier being bonded to the piston body. Advantageously the carrier is being bonded to the piston body by diffusion bonding or electron beam welding.
The heat-.reszsting member and carrier may be rivetted together by means of a plurality of rivets which pass through holes provided in both the heat-resisting member and the carrier. Preferably the ends of the holes remote from the abutting faces of the heatresisting member and the carrier are recessed, e.g. counter sunk, to receive the heads and formed-over ends of the rivets.
Alternatively, either one of or both the heat-resisting member and carrier may have a plurality of pegs or the like extending therefrom and passing through corresponding holes in the other component with the pegs having formed-over ends, whereby the two components are rivetted together by means of the pegs or the like. Again, the ends of the holes remote from the abutting faces of the heat resisting member and carrier may be recessed to receive the formed-over ends of the rivets,
The heat-resisting member may form the entire upper surface of a flat top piston or, alternately, may provide a reinforcement around the edge of a combustion bowl in the piston.In the latter case, the combustion bowl may be formed either entirely or partially in the carrier;
The invention will now be further described, by way of example, with reference to the accompanying drawings, in which:
Figures 1 and 2 are respectively sectional views Ithroughça diameter of the upper part of two different embodiments of piston according to the present invention.
Referring to Fig. 1, a metal alloy, e.g.
aluminium alloy, piston 1 comprises a heatresisting member 2 in the form of a flat disc which constitutes the crown of the piston.
The member 2 is secured by a plurality of rivets 3 to a carrier 4 which is also in the form of a flat disc and which is made of an aluminium alloy: The carrier 4 maybe made of the same aluminium alloy as the body 5 of the piston or of another aluminium alloy, such that the carrier 4 can be joined to the piston body 5 by bonding.
The rivets pass- through aligned holes 6 in the member 2 and carrier 4, and the holes have countersunk recesses 6a and 6b respec tively in the upper face of the member 2 and in the lower face of the carrier to accommodate the heads 3a and formed-over ends 3b of the rivets, such that these faces can be machined flush. The lower face of the carrier 4 is bonded to the upper face of the piston body by electron beam welding or diffusion bonding, as shown at 7.
In the embodiment of Fig. 2, wherein corresponding parts bear the same reference numerals as in Fig. 1, the piston 8 is provided with a recess 9 extending through the heatresisting member 2, the carrier 4 and into the piston body 5. Thus, both the heat-resisting member 2 and the carrier 4 are of annular form so as to define peripheral portions of the wall of the recess 9 which constitutes a combustion chamber or bowl and the heat-resisting member 2 provides a reinforcement around the upper edge of the recess 9.
As in the embodiment of Fig. 1, the rivets 3 have their heads 3a and oppositely formed ends 3b located in countersunk recesses 6a and 6b of the aligned holes through which the rivets pass. the rivets are prefer
In hotti embodiments ably equispaced around a circular path and the size, number and dispostion of the rivets is such that they provide adequate strength to retain the heat-resisting member against the inertia forces which are encountered during the operation of the piston.
It willi be seen that by means of the present invention it is possible to provide a piston crown with a heat-resisting member of a material which is not itself compatible for bonding to the body of the piston without having to employ screw-threaded means to secure the heat-resisting member in position.
Whilst particular embodiments have been described it will be understood that various modifications may be made without departing from the scope of the invention.
WHAT WE CLAIM IS:- 1. A metal alloy piston having a piston crown comprising a heat-resisting member and a carrier, said carrier being made of a material which is different to that of the heat-resisting member but which is bondable to the piston body, said heat-resisting member and said carrier being rivetted together and said carrier being bonded to the piston body.
2. A piston as claimed in claim 1, in which the carrier is bonded to the piston body by diffusion bonding.
3. A piston as claimed in claim 1, in which the carrier is bonded to the piston body by electron beam welding.
4. A piston as claimed in any of the preceding claims, in which the heat-resisting member and carrier are rivetted together by means of a plurality of rivets which pass through holes provided in both the heatresisting member and the carrier.
5. A piston as claimed lin claim 4, in which the ends of the holes remote from the abutting faces of the heat-resisting member and the carrier are recessed to receive the heads and formed-over ends of the rivets.
6. A piston as claimed in any of claims 1 to 3, in which either the heat-resisting member or carrier has a plurality of pegs extending therefrom and passing through corresponding holes in the other component with the pegs having formed-over ends, whereby the heat-resisting member and carrier are rivetted together iby means of the pegs.
7. A piston as claimed in any of claims
1 to 3, in which both the heat-resisting member and carrier have a plurality of pegs extending therefrom and passing through corresponding holes in the other component with the pegs having formed over ends, whereby the heat-resisting member and carrier are rivetted together by means of the pegs.
8. A piston as claimed in claim 6 or 7, in which the ends of the holes remote from the abutting faces of the heat-resisting member and carrier are recessed to receive the formed-over ends of the pegs.
9. A piston as claimed in any of the preceding claims, in which the heat-resisting member forms the entire upper surface of a flat top piston.
10. A piston as claimed in any of claims 1 to 8, in which the heat-resisting member provides a reinforcement around the upper edge of a combustion bowl in the piston.
11. A piston as claimed in claim 10, in which the combustion bowl b formed partially in the carrier.
12. A piston as clai'med in any of the preceding claims, in which the carrier is made of the same material as the body of the piston.
13. A piston as claimed in any preceding claim, in which the rivets are equispaced around a circular path.
14. A metal alloy piston substantially as hereinbefore described with reference to
Figure 1 or Figure 2 of the accompanying drawings.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (14)
1. A metal alloy piston having a piston crown comprising a heat-resisting member and a carrier, said carrier being made of a material which is different to that of the heat-resisting member but which is bondable to the piston body, said heat-resisting member and said carrier being rivetted together and said carrier being bonded to the piston body.
2. A piston as claimed in claim 1, in which the carrier is bonded to the piston body by diffusion bonding.
3. A piston as claimed in claim 1, in which the carrier is bonded to the piston body by electron beam welding.
4. A piston as claimed in any of the preceding claims, in which the heat-resisting member and carrier are rivetted together by means of a plurality of rivets which pass through holes provided in both the heatresisting member and the carrier.
5. A piston as claimed lin claim 4, in which the ends of the holes remote from the abutting faces of the heat-resisting member and the carrier are recessed to receive the heads and formed-over ends of the rivets.
6. A piston as claimed in any of claims 1 to 3, in which either the heat-resisting member or carrier has a plurality of pegs extending therefrom and passing through corresponding holes in the other component with the pegs having formed-over ends, whereby the heat-resisting member and carrier are rivetted together iby means of the pegs.
7. A piston as claimed in any of claims
1 to 3, in which both the heat-resisting member and carrier have a plurality of pegs extending therefrom and passing through corresponding holes in the other component with the pegs having formed over ends, whereby the heat-resisting member and carrier are rivetted together by means of the pegs.
8. A piston as claimed in claim 6 or 7, in which the ends of the holes remote from the abutting faces of the heat-resisting member and carrier are recessed to receive the formed-over ends of the pegs.
9. A piston as claimed in any of the preceding claims, in which the heat-resisting member forms the entire upper surface of a flat top piston.
10. A piston as claimed in any of claims 1 to 8, in which the heat-resisting member provides a reinforcement around the upper edge of a combustion bowl in the piston.
11. A piston as claimed in claim 10, in which the combustion bowl b formed partially in the carrier.
12. A piston as clai'med in any of the preceding claims, in which the carrier is made of the same material as the body of the piston.
13. A piston as claimed in any preceding claim, in which the rivets are equispaced around a circular path.
14. A metal alloy piston substantially as hereinbefore described with reference to
Figure 1 or Figure 2 of the accompanying drawings.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB44009/77A GB1568272A (en) | 1977-10-21 | 1977-10-21 | Pistons |
| JP13037778A JPS54133253A (en) | 1977-10-21 | 1978-10-19 | Piston |
| DE19782845491 DE2845491A1 (en) | 1977-10-21 | 1978-10-19 | LIGHT ALLOY PISTON |
| IT46903/78A IT1104885B (en) | 1977-10-21 | 1978-10-20 | REFINEMENTS CARRIED OUT OR RELATED TO PISTONS IN GENERAL |
| FR7829992A FR2406764A1 (en) | 1977-10-21 | 1978-10-20 | LIGHT ALLOY PISTON WITH PISTON HEAD INCLUDING A HEAT-RESISTANT ELEMENT |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB44009/77A GB1568272A (en) | 1977-10-21 | 1977-10-21 | Pistons |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1568272A true GB1568272A (en) | 1980-05-29 |
Family
ID=10431349
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB44009/77A Expired GB1568272A (en) | 1977-10-21 | 1977-10-21 | Pistons |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS54133253A (en) |
| DE (1) | DE2845491A1 (en) |
| FR (1) | FR2406764A1 (en) |
| GB (1) | GB1568272A (en) |
| IT (1) | IT1104885B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3631279A1 (en) * | 1986-09-13 | 1988-03-24 | Kloeckner Humboldt Deutz Ag | Piston for an internal combustion engine |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB423410A (en) * | 1933-10-11 | 1935-01-31 | Gabrielle Josephe Portail | Improvements in pistons |
| FR44212E (en) * | 1933-10-11 | 1934-12-01 | Metal piston and refractory products for heat engines | |
| DE716600C (en) * | 1939-07-12 | 1942-01-24 | Mahle Kg | Light metal piston for internal combustion engines with a protective plate plated on the floor |
| FR862930A (en) * | 1939-09-08 | 1941-03-19 | Polymetallic piston with removable elements and partially or completely removable from the top of the cylinder | |
| DE760900C (en) * | 1942-10-21 | 1953-12-21 | Mahle Kg | Light metal pistons for internal combustion engines |
| DE1292940B (en) * | 1962-05-22 | 1969-04-17 | Lister & Co Ltd R A | Pistons for internal combustion engines |
| US3385175A (en) * | 1966-06-15 | 1968-05-28 | Mahle Kg | Piston |
| GB1260599A (en) * | 1968-11-08 | 1972-01-19 | Ford Motor Co | A method of making internal combustion engine pistons |
| JPS4821681U (en) * | 1971-07-19 | 1973-03-12 | ||
| DE2206033A1 (en) * | 1972-02-09 | 1973-08-23 | Schmidt Gmbh Karl | Light alloy piston - with friction welded base of sintered, dispersion hardened aluminium alloy |
| JPS5065749A (en) * | 1973-10-12 | 1975-06-03 |
-
1977
- 1977-10-21 GB GB44009/77A patent/GB1568272A/en not_active Expired
-
1978
- 1978-10-19 DE DE19782845491 patent/DE2845491A1/en not_active Withdrawn
- 1978-10-19 JP JP13037778A patent/JPS54133253A/en active Pending
- 1978-10-20 IT IT46903/78A patent/IT1104885B/en active
- 1978-10-20 FR FR7829992A patent/FR2406764A1/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| FR2406764B1 (en) | 1983-04-01 |
| JPS54133253A (en) | 1979-10-16 |
| IT7846903A0 (en) | 1978-10-20 |
| DE2845491A1 (en) | 1979-04-26 |
| IT1104885B (en) | 1985-10-28 |
| FR2406764A1 (en) | 1979-05-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |