US3781963A

US3781963A - Bearing extraction device

Info

Publication number: US3781963A
Application number: US00292949A
Authority: US
Inventors: J Felser
Original assignee: Individual
Current assignee: Individual
Priority date: 1972-09-28
Filing date: 1972-09-28
Publication date: 1974-01-01
Anticipated expiration: 1991-01-01

Abstract

A fixture for removing bearings from a rotary shaft in a machine or device without disassembling same, which consists of a pair of slidable mating members which form a cylindrical sleeve applied to the shaft adjacent to the bearing to be removed and applying a well known screw type wheel or gear-puller onto the fixture with the screw of the puller centered in the end of the shaft. Clockwise rotation of the screw will urge the fixture against the inner end of the bearing and withdraw the bearing from its support.

Description

United States Patent 1191 Felser, Jr. Jan. 1, 1974 BEARING EXTRACTION DEVICE [76] Inventor: Joseph Felser, Jr., 2208 Segori Cir., Pnmary Exammer Thomas Eager Coral Gables, F121. 33134 Ammekuoyi Andres [21] Appl. No. 2 A fixture for removing bearings from a rotary shaft in a machine or device without disassembling same, 52 vs. 1. 29 201 which consists a Pair Shdabh mating members l5 ll 1111. ($1 B23p 1 9/04 which mm a Cylindrical s'eeve applied the shaft [58] Field of Search 29/201 200 D 200 R, jacem the hearing be hemmed and applying a 29/149 5 R well known screw type wheel or gear-puller onto the fixture with the screw of the puller centered in the end [56] References Cited of the shaft. Clockwise rotation of the screw will urge UNITED STATES PATENTS the fixture against the inner end of the bearing and withdraw the bearing from its support. 3,008,226 ll/l96l vKcllcrmun... 29/201 3,742,570 7/1973 Fclscr. Jr. 29 201 4 Claims, 8 Drawing Figures BEARING EXTRACTION DEVICE This invention relates in general to fixtures for the removal of bearings without disassembly of the machine in which they are used.

Reference is had to applicants pending patent application, Ser. No. 24l,786, US. Pat. No. 3,742,570.

Prior to this invention, bearings of the bushing, ball, or needle type are usually fitted on the shaft and support for same in close tolerances therewith, which usually require considerable force for removal for replacement from working positions, which prior to this invention usually required disassembly of the machine in which they are positioned and the use of an Arbor press, hand tools or hammer removal with the aid of a metal sleeve.

In many cases, the removal of a bearing is accomplished by the use of this invention through the use of a relatively low cost split fixture and the application of a well known wheel or gear-puller for simple extraction of the bearings by the wrench rotation of the screw in the wheel puller.

A principal object of the invention is the provision of a demountable fixture for positioning against the end of a bearing and the application thereto of a wheel puller for extracting the bushing without disassembly of the machine in which it is used.

Another object of the invention is the provision of one or more attachments to the fixture for proper engagement with shafts of corresponding sizes for the removal of bearings by the use of a simple gear or wheel puller to motivate the fixture.

These and other objects and advantages in one embodiment of the invention are described and shown in the following specification and drawing, in which:

FIG. 1 is a top plan view ofa typical bearing frictionally retained in a support shown in cross section and fitted with a typical gear-puller prior to extraction.

FIG. 2 is across sectional end view taken through section line 2-2, FIG. 1.

FIG. 3 is a cross sectional view taken through section line 3-3, FIG. 1.

FIG. 4 illustrates the'extraction of the bearing elements shown in FIG. 1.

FIG. 5 is an enlarged, perspective exploded view of the extractor shown in FIG. 1.

FIG. 6 is a perspective view of one of a pair of shaft reduction sleeves.

FIG. 7 is a top view in partial cross section showing two pair of reduction sleeves secured in said extraction device by screws and wing nuts positioned to extract a bearing from a shaft of smaller diameter.

FIG. 8 is a cross sectional view taken through section line 8-8, FIG. 7.

Referring to FIG. 1, a fixed support member 1 supports a bearing 2 which may be a sleeve, ball bearing or roller type, fitted on a shaft 5 by means of an extractor assembly 4 and a standard well known gear-puller assembly 5 which includes a pair of opposite hooks 6-6. In this application half sleeves 7-7 are integral with

telescopic body members

8 and 9 respectively, which are adapted to extract bearing 2 from support member 1 and shaft 3.

FIG. 3. illustrates a pair of

holes

10 and 11 through both half sleeves 7-7 and showing slidable members 12-12 of the body member 8, shown in FIG. 2, slidably positioned in grooves 13-13 in body member 8.

FIG. 6 illustrates one form of sleeve attachment 14 for a shaft of smaller diameter and having a countersunk hole 15 therethrough, to be hereinafter described. The sleeve attachment has a flange 16.at one outer end having substantially the same diameter as the outside diameter of the bearing.

FIG. 7 illustrates the application of two pair of auxiliary sleeve attachments 14, which are retained on the inside of sleeves 7-7 by screws 17-17 and wing nuts 18-18.

F IG. 7 also shows the parallel lateral V grooves 19-19 in

members

8 and 9 for receiving the ends of the hooks 6-6, respectively.

FIG. 5 illustrates the exploded view of the two major elements of the extractor prior to installation over the shaft for the extraction of a bushing thereon, and also showing the slidable relation of members 12-12 in member 8 in corresponding slots 20-20 in member 9.

It is to be noted that cylindrical pins may be substituted for the rectangular members 12-12 in member 8 and corresponding holes may be substituted for the slots 20-20 in member 9.

In operation, to remove a bearing from the end portion of a shaft and the support, each half of the extractor sleeve is placed on opposite sides of the shaft on the inside of the support and by sliding

members

8 and 9 together and by fitting the hooks 6 of the gear-puller into the grooves 19 with the point of the screw of the puller engaged in the center of the end of the shaft 3. Then the clockwise rotation of the screw will force the extraction sleeves to be moved against the inner side of the bearing and force same outward from the support, as illustrated in FIG. 4.

It is now apparent that sleeves similar to those shown in FIG. 6 may be applied to the outer side of each sleeve 7 to accommodate the extraction of bearings of larger diameter.

It is to be understood that certain modifications in constructionare intended to come within the teachings and scope of the above specification.

Having described my invention, I claim:

1. An extracting device for a cylindrical bearing fitted in a support means and retaining the end portion of a rotary shaft,

a pair of like cylindrical first and second half sleeves of predetermined like length with the end bearing surfaces thereof in a plane normal to said sleeves when each of said sleeves are in mated relation and with the inside cylindrical diameter substantially equal to the diameter of said shaft and the outside cylindrical diameter substantially equal to the diameter of said bearing,

a telescopic first projection means integral with and extending normal from the outer end portion of said first of said half sleeves,

a telescopic second slidable projection means extending normal from the outer end portion of said second of said sleeves and adapted to be engaged for manual sliding movement toward and into said first projection means for mating said sleeves together around said shaft with the said end surfaces thereof positioned against the inner side of said bearing,

a gear-puller having a pair of pivotal hooks and a central screw means whereby each said hook of said gear-puller is positioned around opposite sides of said support means and engaged with each opposite telescopic first and second projection means respectively and the end of said screw means engaged in the end of said shaft for manually forcing said bearing from said support means and said shaft when said screw means is manually rotated through a predetermined distance. r 2. The construction recited in claim 1 wherein said first projection means has a pair of parallel straight rectangular grooves extending along said projection means at each side of said first half sleeve and said second projection means includes a pair of parallel straight rectangular guides normal to and on opposite sides of said second half sleeve for engaging and manually sliding said guides in said grooves for guiding each of said sleeves into mating relation.

3. The construction recited in claim 1 wherein said first projection means includes a pair of parallel cylindrical pins extending in transverse relation from said projection means at each side of said first half sleeve and said second projection means having a pair of parallel holes in transverse relation with respect to said second half sleeve whereby said pins will be manually engaged in said holes when said half sleeves are in mated relation on opposite sides of said shaft.

4. The construction recited in claim 1 including a pair of auxiliary half sleeves with each one of predetermined uniform thickness and fitted to each said first and second half sleeves and retained therein by screw means with the outer ends of said auxiliary sleeves forming a cylindrical flange mating the outside diameter of the bearing to be extracted.

Claims

1. An extracting device for a cylindrical bearing fitted in a support means and retaining the end portion of a rotary shaft, a pair of like cylindrical first and second half sleeves of predetermined like length with the end bearing surfaces thereof in a plane normal to said sleeves when each of said sleeves are in mated relation and with the inside cylindrical diameter substantially equal to the diameter of said shaft and the outside cylindrical diameter substantially equal to the diameter of said bearing, a telescopic first projection means integral with and extending normal from the outer end portion of said first of said half sleeves, a telescopic second slidable projection means extending normal from the outer end portion of said second of said sleeves and adapted to be engaged for manual sliding movement toward and into said first projection means for mating said sleeves together around said shaft with the said end surfaces thereof positioned against the inner side of said bearing, a gear-puller having a pair of pivotal hooks and a central screw means whereby each said hook of said gear-puller is positioned around opposite sides of said support means and engaged with each opposite telescopic first and second projection means respectively and the end of said screw means engaged in the end of said shaft for manually forcing said bearing from said support means and said shaft when said screw means is manually rotated through a predetermined distance.

2. The construction recited in claim 1 wherein said first projection means has a pair of parallel straight rectangular grooves extending along said projection means at each side of said first half sleeve and said second projection means includes a pair of parallel straight rectangular guides normal to and on opposite sides of said second half sleeve for engaging and manually sliding said guides in said grooves for guiding each of said sleeves into mating relation.