CA1235877A - Casting metal around an anti-friction bearing - Google Patents
Casting metal around an anti-friction bearingInfo
- Publication number
- CA1235877A CA1235877A CA000464848A CA464848A CA1235877A CA 1235877 A CA1235877 A CA 1235877A CA 000464848 A CA000464848 A CA 000464848A CA 464848 A CA464848 A CA 464848A CA 1235877 A CA1235877 A CA 1235877A
- Authority
- CA
- Canada
- Prior art keywords
- bearing
- mold
- metal
- casting
- around
- 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
Landscapes
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
CASTING METAL AROUND AN ANTI-FRICTION BEARING
ABSTRACT OF THE DISCLOSURE
A technique is disclosed for casting metal around an anti-friction bearing without damaging the anti-friction bearing, its grease or seal. The bearing is placed in a mold and the mold is closed. Heated liquid metal is injec-ted under pressure into the mold. The mold is opened im-mediately upon solidification of the metal, and the anti-friction bearing with the metal casting around it is ejec-ted. The anti-friction bearing is cooled immediately after its ejection to avoid damage. The resulting casting con-taining a bearing may be a water pump housing for a motor vehicle or an electric motor bearing plate, for example.
ABSTRACT OF THE DISCLOSURE
A technique is disclosed for casting metal around an anti-friction bearing without damaging the anti-friction bearing, its grease or seal. The bearing is placed in a mold and the mold is closed. Heated liquid metal is injec-ted under pressure into the mold. The mold is opened im-mediately upon solidification of the metal, and the anti-friction bearing with the metal casting around it is ejec-ted. The anti-friction bearing is cooled immediately after its ejection to avoid damage. The resulting casting con-taining a bearing may be a water pump housing for a motor vehicle or an electric motor bearing plate, for example.
Description
~Z3~7~7 ~-4249 CAS~ING ME~AL AROUND AN AN~I-FRIC~ION BEARING
BACKGROUND OF ~HE INVENrION
-1. Field of the Invention ~ he invention relates to casting metal around an anti-~riction bearing.
BACKGROUND OF ~HE INVENrION
-1. Field of the Invention ~ he invention relates to casting metal around an anti-~riction bearing.
2. Description of the Prior Art German Application DE OS 24 4g 455 discloses a method of castin~ the outer ring of an anti-friction bear-ing into a flanged bearing or pedestal-bearing housing.
For self-aligning roller or ball bearings, the rolling ele-ment and the inner ring may then be inserted, since their spherical shape permits such bearings to be swivelled. In traditional ball bearings, however, in which the rolling elements are brou~ht between the race rings by elastic de-formation of the outer ring, as in the Konrad method, the bearing cannot be subsequently assembled, because the outer ring is no longer sufficiently elastic after the casting is formed around it.
German Utility Model Application GM 72 42 623 dis-closes a method in which completely assembled anti-friction bearings are pushed onto pins, inserted into a mold, and surrounded with synthetic resin. In such a method, so-called hardenable synthetic resins are used, which normally have temperatures during casting within a range which does not harm the finished anti-friction bearing.
i8~7~
It has not previously been possible, however, to cast metal around a completely assembled, lubricated and sealed anti-friction bearing since the anti-friction bear-ing, its grease and its seal cou]d not withstand the tem-peratures during casting without being damaged. ~hose tem-peratures reach about 750C in the case of aluminum die castings, for e~ample.
SUMMARY OF ~HE INVEN~ION
One object of the present invention is tharefore to make it possible to cast metal around an anti-friction bearing without the anti-~riction bearing or its grease and seal being damaged.
~ he method of the present invention includes the steps of positioning a bearing within a mold, closing the mold, and injecting heated liquid metal under pressure into the mold around the bearing. As soon as the metal solidi-fies, and before it cools substantially, the mold is im-mediately opened, and the bearing with the metal casting around it is immediately ejected. ~he bearing is immedi-ately cooled, before any part of it is damaged by heat from the heated metal.
~ he metal casting may be formed from a non-ferrous metal. ~he casting may produce a temperature of about 750C and the bearing is preferably ejected within 15 sec-onds after injection of the liquid metal to avoid damage.
An apparatus for practicing the invention may in-clude a mold having two sides which may be moved to open and close the mold. Between the sides is a space in which mold core means position the bearing~
A product produced by the invention may include a bearing whose outer surface has been roughly machined or has an anti-turning lock on it for being secured to the metal casting, ~he metal casting may be a water pump hous-ing for a motor vehicle or a bearing plate for an electric motor, for e~ample.
The present invention makes it possible to cast metal around anti-friction bearings, which results in a great advance in the use of such bearings. Up to now, in applications such as water pumps for automoti~e vehicles, it has been necessary to machine the bearing seats very accurately. If the housing is an aluminum die casting, the originally srnooth surface of the cast outer skin is de-stroyed and shrinkage cavities may appear. ~he outer sur-faces of the outer bearing ring also must be ground to asæurP a firm seat in the housing, During assembly, the bearings are then pressed into the housing.
~ he need for all of these cumbersome and expensive measures is eliminated by the present invention. ~he outer bearing rings may merely be turned to provide a Kroove on their outer surfaces or they may be completely unmachined.
I~ a second step or simultaneously with the casting around the outside of the anti-friction bearing, a part such as the pump wheel can be cast onto the shaft, resulting in ~urther savings of machining and assembly time. rhe user no longer receives an anti-friction bearing and a housing in which it is to be installed, but a single unit which is ready for installation.
Other objects, features and advantages of the in-vention will be apparent from the following description, together with the accompanying drawings and the appended claims.
BRIEF DESCRIP~ION OF ~HE DRAWINGS
Fig. 1 is a partial cross-sectional view of an apparatus for casting metal around an anti-friction bear-ing.
Fig~ 2 is a view in partial cross-sectional view of a water-pump bearing with water-pump housing cast thereon according to the inventionO
~Z~77 DE~AILED DESCRIP~ION OF ~HE PREFERRED EMBODIMEN~S
~ he invention may be understood from Fig. 1, show-ing in partial cross~section an apparatus for casting metal around an anti-friction bearing. Fig. 1 shows a split mold which may be used for practicing the invention and which includes s~ationary mold side 1 and displaceable mold side In the closed posltion shown, displaceable mold side 2 fits at its edges~against stationary mold side 1, and is spaced apar~ from stationary mold side 1 inside its edges to de~ine a space inside the mold. ~he core of the mold, in this embodiment, is also spllt and includes statlonary mold core 3, anti-friction bearing 4 around which metal is to be cast and displaceable mold core 5. Stationary and displaceable mold cores 3 and 5 receive bearing 4 and hold it in ~ cen~ered position in the space within the mold, and also seal it at lts ends.
After bearing 4 is placed in the mold, by insert-ing the mold core into stationary mold side 1, the mold is closed by moving displaceable mold side 2 into the closed position show~. Side wall 14 may be provided so that dis-placeable mold side 2 may slide along its inner surface into position against s$ationary mold side 1. End walls 15 hold mold sides 1 and 2 in place during the injection of liquid metal, as discussed below. ~he bearing could also be directly lnserted into mold sides 1 and 2, but insertion into the mold cores 3 and 5 is advantageous because a dif-ferent shape of bearing may be used by merely using corres-ponding differently shaped mold cores.
Fig. 1 also shows housing 6 formed by filling the space which remains between the mold core, including anti-friction bearing 4, and the mold sides 1 and 2 with injec-ted liqu~d metal such as the alloy Al~gSi8Cu3 or other non-ferrous metal. ~his metal ls injected into the space under pressure in a hea~ed molten stateO As soon as the metal solidifies, the mold is opened by moving displaceable mold :, i8~7 side 2 to the open position. Housing 6 together with bear-ing 4 which it surrounds are immediately ejected from the open mold, so that the metal casting is ejected before any substantial cooling has occurr0d. ~fter ejection, bearing 4 is immediately cooled to avoid damage from heat. ~he temperature reached in casting the liquid metal is prefer-ably about 750C, and the time from injecting the liquid metal to ejecting the casting is preferably no more than 15 seconds, to avoid damage to any part of the bearing.
After the ejection of housing 6 from the mold, the bearing 4 is held ~irmly in housing 6, which may be a water-pump housing, so that expensive machining and assem-bly to obtain a firm mounting are necessary. ~o proYide assurance against turning and translation of bearing 4 in relation to housing 6, the outer ring of bearing 4 can also be milled to provide a wrench flat 7 or other appropriate anti-turning lock. Roughly machining the outer ring, as by turning, suffices to secure the bearing 4 within housing 6.
Fig. 2 shows a water pump bearing produced accord-ing to the invention, using an apparatus like that shown inFig. 1. ~he anti-friction bearing 4 includes a shaft 8, in which the races 12 for the balls 9 are machined. An outer ring 10 surrounds balls 9 and shaft 8 and has a sealing disc 11 at each of its ends. Outer ring 10 is also turned to form groove 13 to secure bearing 4 in housing 6. ~he bearing 4 is permanently lubricated with grease, so that relubrication is not necessary.
It is apparent from Fig. 2 that an additional part, such as a water pump pulley wheel, could be cast onto shaft 8, either at the same time as the casting of housing 6 or subsequent~y. For example, bearing 4 and housing 6 could be positioned in a second mold tnot shown) different than the mold of Fig. 1, with a space around shaft 8 for forming a wheel. After the second mold is closed, addi-tional liquid metal could be inj~cted under pressure into the space. Immediately upon solldification of this addi-tional metal ~o form a casting of the wheel, the second mold is opened and the bearing 4 and both castings are ejected. Bearing 4 is immediately cooled, and a second castin~ is thus obtained.
As a result o~ the method of the invention, bear-in~ ~, its ~rease and seals 11 are surprisingly undamaged by the temperatures around 750C which occur during the casting of the hot liquid metal.
Although the invention has been described in relation to a water pump, its use is not limited to this example. Bearing plates for electric motors or travel or tensioning rollers can also be produced according to the invention.
Although the present invention has been described in connection with a plurality of preferred embodiments thereof, many other variations and modi~ications will now become apparent to those skilled in the art. It is pre-ferred, therefore, that the present invention be limited not by the specific disclosure herein, but only by the ap-pended claims.
For self-aligning roller or ball bearings, the rolling ele-ment and the inner ring may then be inserted, since their spherical shape permits such bearings to be swivelled. In traditional ball bearings, however, in which the rolling elements are brou~ht between the race rings by elastic de-formation of the outer ring, as in the Konrad method, the bearing cannot be subsequently assembled, because the outer ring is no longer sufficiently elastic after the casting is formed around it.
German Utility Model Application GM 72 42 623 dis-closes a method in which completely assembled anti-friction bearings are pushed onto pins, inserted into a mold, and surrounded with synthetic resin. In such a method, so-called hardenable synthetic resins are used, which normally have temperatures during casting within a range which does not harm the finished anti-friction bearing.
i8~7~
It has not previously been possible, however, to cast metal around a completely assembled, lubricated and sealed anti-friction bearing since the anti-friction bear-ing, its grease and its seal cou]d not withstand the tem-peratures during casting without being damaged. ~hose tem-peratures reach about 750C in the case of aluminum die castings, for e~ample.
SUMMARY OF ~HE INVEN~ION
One object of the present invention is tharefore to make it possible to cast metal around an anti-friction bearing without the anti-~riction bearing or its grease and seal being damaged.
~ he method of the present invention includes the steps of positioning a bearing within a mold, closing the mold, and injecting heated liquid metal under pressure into the mold around the bearing. As soon as the metal solidi-fies, and before it cools substantially, the mold is im-mediately opened, and the bearing with the metal casting around it is immediately ejected. ~he bearing is immedi-ately cooled, before any part of it is damaged by heat from the heated metal.
~ he metal casting may be formed from a non-ferrous metal. ~he casting may produce a temperature of about 750C and the bearing is preferably ejected within 15 sec-onds after injection of the liquid metal to avoid damage.
An apparatus for practicing the invention may in-clude a mold having two sides which may be moved to open and close the mold. Between the sides is a space in which mold core means position the bearing~
A product produced by the invention may include a bearing whose outer surface has been roughly machined or has an anti-turning lock on it for being secured to the metal casting, ~he metal casting may be a water pump hous-ing for a motor vehicle or a bearing plate for an electric motor, for e~ample.
The present invention makes it possible to cast metal around anti-friction bearings, which results in a great advance in the use of such bearings. Up to now, in applications such as water pumps for automoti~e vehicles, it has been necessary to machine the bearing seats very accurately. If the housing is an aluminum die casting, the originally srnooth surface of the cast outer skin is de-stroyed and shrinkage cavities may appear. ~he outer sur-faces of the outer bearing ring also must be ground to asæurP a firm seat in the housing, During assembly, the bearings are then pressed into the housing.
~ he need for all of these cumbersome and expensive measures is eliminated by the present invention. ~he outer bearing rings may merely be turned to provide a Kroove on their outer surfaces or they may be completely unmachined.
I~ a second step or simultaneously with the casting around the outside of the anti-friction bearing, a part such as the pump wheel can be cast onto the shaft, resulting in ~urther savings of machining and assembly time. rhe user no longer receives an anti-friction bearing and a housing in which it is to be installed, but a single unit which is ready for installation.
Other objects, features and advantages of the in-vention will be apparent from the following description, together with the accompanying drawings and the appended claims.
BRIEF DESCRIP~ION OF ~HE DRAWINGS
Fig. 1 is a partial cross-sectional view of an apparatus for casting metal around an anti-friction bear-ing.
Fig~ 2 is a view in partial cross-sectional view of a water-pump bearing with water-pump housing cast thereon according to the inventionO
~Z~77 DE~AILED DESCRIP~ION OF ~HE PREFERRED EMBODIMEN~S
~ he invention may be understood from Fig. 1, show-ing in partial cross~section an apparatus for casting metal around an anti-friction bearing. Fig. 1 shows a split mold which may be used for practicing the invention and which includes s~ationary mold side 1 and displaceable mold side In the closed posltion shown, displaceable mold side 2 fits at its edges~against stationary mold side 1, and is spaced apar~ from stationary mold side 1 inside its edges to de~ine a space inside the mold. ~he core of the mold, in this embodiment, is also spllt and includes statlonary mold core 3, anti-friction bearing 4 around which metal is to be cast and displaceable mold core 5. Stationary and displaceable mold cores 3 and 5 receive bearing 4 and hold it in ~ cen~ered position in the space within the mold, and also seal it at lts ends.
After bearing 4 is placed in the mold, by insert-ing the mold core into stationary mold side 1, the mold is closed by moving displaceable mold side 2 into the closed position show~. Side wall 14 may be provided so that dis-placeable mold side 2 may slide along its inner surface into position against s$ationary mold side 1. End walls 15 hold mold sides 1 and 2 in place during the injection of liquid metal, as discussed below. ~he bearing could also be directly lnserted into mold sides 1 and 2, but insertion into the mold cores 3 and 5 is advantageous because a dif-ferent shape of bearing may be used by merely using corres-ponding differently shaped mold cores.
Fig. 1 also shows housing 6 formed by filling the space which remains between the mold core, including anti-friction bearing 4, and the mold sides 1 and 2 with injec-ted liqu~d metal such as the alloy Al~gSi8Cu3 or other non-ferrous metal. ~his metal ls injected into the space under pressure in a hea~ed molten stateO As soon as the metal solidifies, the mold is opened by moving displaceable mold :, i8~7 side 2 to the open position. Housing 6 together with bear-ing 4 which it surrounds are immediately ejected from the open mold, so that the metal casting is ejected before any substantial cooling has occurr0d. ~fter ejection, bearing 4 is immediately cooled to avoid damage from heat. ~he temperature reached in casting the liquid metal is prefer-ably about 750C, and the time from injecting the liquid metal to ejecting the casting is preferably no more than 15 seconds, to avoid damage to any part of the bearing.
After the ejection of housing 6 from the mold, the bearing 4 is held ~irmly in housing 6, which may be a water-pump housing, so that expensive machining and assem-bly to obtain a firm mounting are necessary. ~o proYide assurance against turning and translation of bearing 4 in relation to housing 6, the outer ring of bearing 4 can also be milled to provide a wrench flat 7 or other appropriate anti-turning lock. Roughly machining the outer ring, as by turning, suffices to secure the bearing 4 within housing 6.
Fig. 2 shows a water pump bearing produced accord-ing to the invention, using an apparatus like that shown inFig. 1. ~he anti-friction bearing 4 includes a shaft 8, in which the races 12 for the balls 9 are machined. An outer ring 10 surrounds balls 9 and shaft 8 and has a sealing disc 11 at each of its ends. Outer ring 10 is also turned to form groove 13 to secure bearing 4 in housing 6. ~he bearing 4 is permanently lubricated with grease, so that relubrication is not necessary.
It is apparent from Fig. 2 that an additional part, such as a water pump pulley wheel, could be cast onto shaft 8, either at the same time as the casting of housing 6 or subsequent~y. For example, bearing 4 and housing 6 could be positioned in a second mold tnot shown) different than the mold of Fig. 1, with a space around shaft 8 for forming a wheel. After the second mold is closed, addi-tional liquid metal could be inj~cted under pressure into the space. Immediately upon solldification of this addi-tional metal ~o form a casting of the wheel, the second mold is opened and the bearing 4 and both castings are ejected. Bearing 4 is immediately cooled, and a second castin~ is thus obtained.
As a result o~ the method of the invention, bear-in~ ~, its ~rease and seals 11 are surprisingly undamaged by the temperatures around 750C which occur during the casting of the hot liquid metal.
Although the invention has been described in relation to a water pump, its use is not limited to this example. Bearing plates for electric motors or travel or tensioning rollers can also be produced according to the invention.
Although the present invention has been described in connection with a plurality of preferred embodiments thereof, many other variations and modi~ications will now become apparent to those skilled in the art. It is pre-ferred, therefore, that the present invention be limited not by the specific disclosure herein, but only by the ap-pended claims.
Claims (2)
OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A method of casting a metal housing around a completed anti-friction roller bearing comprising:
(A) positioning a completed, lubricated, sealed roller bearing in a space defined within a pressure mold;
(B) closing the mold;
(C) injecting nonferrous metal under pressure at approximately 750°C into the mold around the bearing and contacting the outer surface of the bearing;
(D) after at most 15 seconds, opening the mold and ejecting the bearing with the metal casting around it; and (E) immediately cooling the bearing.
(A) positioning a completed, lubricated, sealed roller bearing in a space defined within a pressure mold;
(B) closing the mold;
(C) injecting nonferrous metal under pressure at approximately 750°C into the mold around the bearing and contacting the outer surface of the bearing;
(D) after at most 15 seconds, opening the mold and ejecting the bearing with the metal casting around it; and (E) immediately cooling the bearing.
2. The process of claim 1, wherein the liquid nonferrous metal is an alloy comprised of aluminum, silicon and copper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000464848A CA1235877A (en) | 1984-10-05 | 1984-10-05 | Casting metal around an anti-friction bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000464848A CA1235877A (en) | 1984-10-05 | 1984-10-05 | Casting metal around an anti-friction bearing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1235877A true CA1235877A (en) | 1988-05-03 |
Family
ID=4128852
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000464848A Expired CA1235877A (en) | 1984-10-05 | 1984-10-05 | Casting metal around an anti-friction bearing |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1235877A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5275538A (en) * | 1990-07-09 | 1994-01-04 | Deco-Grand, Inc. | Electric drive water pump |
| US5482432A (en) * | 1990-07-09 | 1996-01-09 | Deco-Grand, Inc. | Bearingless automotive coolant pump with in-line drive |
-
1984
- 1984-10-05 CA CA000464848A patent/CA1235877A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5275538A (en) * | 1990-07-09 | 1994-01-04 | Deco-Grand, Inc. | Electric drive water pump |
| US5279503A (en) * | 1990-07-09 | 1994-01-18 | Deco-Grand, Inc. | Ram air electric drive water pump |
| US5482432A (en) * | 1990-07-09 | 1996-01-09 | Deco-Grand, Inc. | Bearingless automotive coolant pump with in-line drive |
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| Date | Code | Title | Description |
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| MKEX | Expiry |