CA1094356A - Method of pulley manufacture and product - Google Patents
Method of pulley manufacture and productInfo
- Publication number
- CA1094356A CA1094356A CA293,232A CA293232A CA1094356A CA 1094356 A CA1094356 A CA 1094356A CA 293232 A CA293232 A CA 293232A CA 1094356 A CA1094356 A CA 1094356A
- Authority
- CA
- Canada
- Prior art keywords
- roller
- wall
- pulley
- sheet metal
- base
- 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/32—Friction members
- F16H55/36—Pulleys
- F16H55/44—Sheet-metal pulleys
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/26—Making other particular articles wheels or the like
- B21D53/261—Making other particular articles wheels or the like pulleys
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Pulleys (AREA)
Abstract
A B S T R A C T
This invention relates to a novel method of making pulleys and pulley blanks from sheet metal. The sheet metal is stamped into pulley blanks having an upstanding cylindrical wall, the cylindrical wall is then thickened by being partially collapsed axially, followed by contacting with a roller. The roller can have a plurality of v-shaped grooves on its surface, to form a pulley for use with a poly-v belt. The pulley is provided during manufacture with flanges which strengthen it.
This invention relates to a novel method of making pulleys and pulley blanks from sheet metal. The sheet metal is stamped into pulley blanks having an upstanding cylindrical wall, the cylindrical wall is then thickened by being partially collapsed axially, followed by contacting with a roller. The roller can have a plurality of v-shaped grooves on its surface, to form a pulley for use with a poly-v belt. The pulley is provided during manufacture with flanges which strengthen it.
Description
3~6 This application relates to a method of thickening sheet metal ln selected areas. In a more preferred embodiment, this application relates to a method of making pulleys from sheet metal.
The method of making pulleys from sheet metal has long been known. Such pulleys are often made by a metal spinning pro-cess, such as that shown in Wickwire et al, U.S.P. 2,685,856, dated August 10, 1954, or Harrison et al, U.S.P. 1,828,464 dated October 20, 1931. Both of these patents show making of pulleys with a single v-groove, which can be used to contain and provide power to a v-belt. It is possible also to make pulleys having two v-shaped grooves by a metal spinning process, as shown in U.S. Patent
The method of making pulleys from sheet metal has long been known. Such pulleys are often made by a metal spinning pro-cess, such as that shown in Wickwire et al, U.S.P. 2,685,856, dated August 10, 1954, or Harrison et al, U.S.P. 1,828,464 dated October 20, 1931. Both of these patents show making of pulleys with a single v-groove, which can be used to contain and provide power to a v-belt. It is possible also to make pulleys having two v-shaped grooves by a metal spinning process, as shown in U.S. Patent
2,892,431 of Killian et al, dated June 20, 1959. However, this involves more complicated machinery, and is also sub~ect to diffi-culty because the formatioh of the v-grooves causes metal flow, leading to thinned portions of the pulley wall around the v-grooves which may lead to failure of the pulley in operation.
It has been proposed to form pulleys having more than two v-grooves by the use of metal dies, as has been disclosed in U.S.P.
It has been proposed to form pulleys having more than two v-grooves by the use of metal dies, as has been disclosed in U.S.P.
3,368,376 of Previte, dated February 13, 1968. However, this pro-cess wculd require complicated dies with expanding arcuate segments.Another process, which involves the spinning of shallow grooves which are folded together into a sinuous shape and impressed with a v-grooved roller, has been proposed in U.S.P. 3,977,264 of Sproul.
This process also involves expanding die segments and complicated equipment, and requires that very thin grooved metal be precisely folded together without tearing. Insofar as applicant is aware, neither the Previte nor the 5proul process has been used commer-, cially.
The formation of v-grooves in the side of a pulley in any 30 of the aforesaid processes can lead to thinning of the pulley wall, and therefore failure of the pulley. One reason for this is that a considerable amount of metal ~low must necessaril~ occur in .~ .
~g43~l6 these processes, and it is difficult to guide this flow in such a way that all portions of the finished v-groove in the pulley are of ade~uate thi~kness. Accordingly, it is necessary to start from a fairly heavy gauge metal, so that the final pulley will be of sufficient strength to resist the torsional stresses which would tend ~ ~
": ' - la to drive it out-of-rouna in operation.
~ The existing spun pulleys have been usable with respect to single v-belts, which are belts having one flat side and one siae shaped in an outwardly pointing vee configuration. How-ever, for many years, other belts, known as poly v-belts,have been used in a number of operations, such as for the powering of speci-alized machinery~ These belts have one flat side and a plurality (usually six) of vee portions extending outwardly on the oppos~te side, in a saw-tooth pattern. The pxoduction of p~lleys to engage such belts has been difficult, as the saw-tooth like configuration of a poly v-belt requi~es a number of sharply pointed vee config-uarations on the pulley, in relatively close proximity to one an-other. This uses up a great deal of metal. Accordingly, a rela~
tively thick walled pulley can must be used if traditional metal spinning techniques, or a die stamping technique such as that of Previte,is to be employed. The resulting pulleys would be h6avy and expensive to make, and have not found favour in automobile ~anufacture, where low cost and weight reduction are desirable for commercial acceptance. The lack of effective, low cost, light-weight pulleys has prevented the widespread adoption of poly v-.. . .
~ belts by the automob~le industry, despite other inherent advan--~ tages which have been recogniæed for such belts.
: . , -~ In most spinning or aie-stamping methods, the pull~y blank is formed initially by drawing a flat piece of metal into a shape having a base and an ups~anding cylindrical wall. This blank is commonly known as a "cann. The pulley grooves are rolled or die-stamped into the wall of the can. Accordingly, the initial flat piece of metal must be chosen to be of a sufficient thickness so that the can wall, after drawing, is of sufficient thickness to make ~-grooves of adequate strength for the intended application.
However, the drawing process produces a wall which is either the same thickness as, or slightly thinner than, the base~ Accordingly, 315~i in the present processes, the minimum thickness permissible for the starting piece of metal is determined by the minimum thickness tolerable in the walls of the can. As the can base is subjected to lesser stresses than the wall during formation of the pulley, it need not be as thick or strong as the wall. It would there-fore be advantageous in many cases, from a cost point of view, to provide a pulley can which has a strengthened wall.
Accordingly, it is the object of the present invention to provide a method for strengthening the approximately cylindrical wall portions of a pulley blank or "can" so that the wall portion will be more robust than would otherwise be possible with the thickness of sheet metal used to form the pulley can. It is -another object of the invention to prepare pulleys having at least four v-grooves in their sides, such v-groo~es having rela-tively sharp bottoms to their vees. It is another object to form a generalized method of thickening the sheet metal of vertical walls of a drawn can, so as to stren~then the vertical upstanding walls. It is another object to provlde light-weight, strong pulleys for the purpose of powering poly v-belts in automobiles.
Having regard to these objects, the invention in one of its aspects comprises a novel sheet metal pulley comprising a circular sheet metal base of sheet metal having a predetermined thickness, a cyl~ndrical wall upstanding from the base and formed from the same piece of sheet metal as the base, said wall having a smoothly cylindrical inner surface and an outer surface having at least four parallel ~T-shaped grooves, separated by projections, extending around the cylindrical wall at right angles thereto; a first annular flange formed from the same piece of sheet metal as the base and extending outwardly from the wall at the point where the wall joins the base; a second annular flange formed from th~
same piece of sheet metal as the wall and base extending out-wardly from the end of the wall remote from the base, said ~09~3~i6 annular flanges defining the ends of the outer surface of the cylindrical wall.
Another aspect of the invention provides a novel method of forming a pulley, which comprises: providing a pulley blank formed o~ sheet metal and having a circular base and a cylindri-cal wall upstanding from the circumference of the base; contacting the upstanding wall with a first roller, said first roller having a main face and receding sloping faces at each end of the main face, while said pulley blank is rotatably retained in apparatus having sloped faces to coact with the sloped faces on the roller;
rotating at least one of the roller and the pulley blank, said , roller and said pulley blank being contacted with sufficient force such that both rotate, while moving the roller inward, ~
whereby said main face of the roller defines a wall in the ' ' pulley blank and the coacting sloped faces on the apparatus and roller define upper and lower flanges bounding said wall;
partially, but not completely, collapsing said wall in an axial direction; providing a cylindrical backing block of smaller diameter than the pulley blank within the pulley blank; contacting ':
.. .. . ... .. .. . . .. . ... ... . . .. . . . ...
the exterior of the partially collapsed wall with th,e face of a second roller to form the blank into a pulley, said roller and ;:, said blank being rotatable and said backing block being rotatable ,:
-~ with the blank, and one of said blank and said roller bein~ caused to rotate, said roller and said blank being contacted with suf-ficient force such that both rotate, while moving the roller in-wardly to a predetermined distance from the backing block, whereby ;~
-~ the roller deforms the metal of the wall completely filling the : space between the roller and the backing block forming a smooth cylindrical interior wall when such roller is at the predetermined distance from the backing block.
The second roller as described above can be smoothly c~lindrical and the predetermined distance can be greater than
This process also involves expanding die segments and complicated equipment, and requires that very thin grooved metal be precisely folded together without tearing. Insofar as applicant is aware, neither the Previte nor the 5proul process has been used commer-, cially.
The formation of v-grooves in the side of a pulley in any 30 of the aforesaid processes can lead to thinning of the pulley wall, and therefore failure of the pulley. One reason for this is that a considerable amount of metal ~low must necessaril~ occur in .~ .
~g43~l6 these processes, and it is difficult to guide this flow in such a way that all portions of the finished v-groove in the pulley are of ade~uate thi~kness. Accordingly, it is necessary to start from a fairly heavy gauge metal, so that the final pulley will be of sufficient strength to resist the torsional stresses which would tend ~ ~
": ' - la to drive it out-of-rouna in operation.
~ The existing spun pulleys have been usable with respect to single v-belts, which are belts having one flat side and one siae shaped in an outwardly pointing vee configuration. How-ever, for many years, other belts, known as poly v-belts,have been used in a number of operations, such as for the powering of speci-alized machinery~ These belts have one flat side and a plurality (usually six) of vee portions extending outwardly on the oppos~te side, in a saw-tooth pattern. The pxoduction of p~lleys to engage such belts has been difficult, as the saw-tooth like configuration of a poly v-belt requi~es a number of sharply pointed vee config-uarations on the pulley, in relatively close proximity to one an-other. This uses up a great deal of metal. Accordingly, a rela~
tively thick walled pulley can must be used if traditional metal spinning techniques, or a die stamping technique such as that of Previte,is to be employed. The resulting pulleys would be h6avy and expensive to make, and have not found favour in automobile ~anufacture, where low cost and weight reduction are desirable for commercial acceptance. The lack of effective, low cost, light-weight pulleys has prevented the widespread adoption of poly v-.. . .
~ belts by the automob~le industry, despite other inherent advan--~ tages which have been recogniæed for such belts.
: . , -~ In most spinning or aie-stamping methods, the pull~y blank is formed initially by drawing a flat piece of metal into a shape having a base and an ups~anding cylindrical wall. This blank is commonly known as a "cann. The pulley grooves are rolled or die-stamped into the wall of the can. Accordingly, the initial flat piece of metal must be chosen to be of a sufficient thickness so that the can wall, after drawing, is of sufficient thickness to make ~-grooves of adequate strength for the intended application.
However, the drawing process produces a wall which is either the same thickness as, or slightly thinner than, the base~ Accordingly, 315~i in the present processes, the minimum thickness permissible for the starting piece of metal is determined by the minimum thickness tolerable in the walls of the can. As the can base is subjected to lesser stresses than the wall during formation of the pulley, it need not be as thick or strong as the wall. It would there-fore be advantageous in many cases, from a cost point of view, to provide a pulley can which has a strengthened wall.
Accordingly, it is the object of the present invention to provide a method for strengthening the approximately cylindrical wall portions of a pulley blank or "can" so that the wall portion will be more robust than would otherwise be possible with the thickness of sheet metal used to form the pulley can. It is -another object of the invention to prepare pulleys having at least four v-grooves in their sides, such v-groo~es having rela-tively sharp bottoms to their vees. It is another object to form a generalized method of thickening the sheet metal of vertical walls of a drawn can, so as to stren~then the vertical upstanding walls. It is another object to provlde light-weight, strong pulleys for the purpose of powering poly v-belts in automobiles.
Having regard to these objects, the invention in one of its aspects comprises a novel sheet metal pulley comprising a circular sheet metal base of sheet metal having a predetermined thickness, a cyl~ndrical wall upstanding from the base and formed from the same piece of sheet metal as the base, said wall having a smoothly cylindrical inner surface and an outer surface having at least four parallel ~T-shaped grooves, separated by projections, extending around the cylindrical wall at right angles thereto; a first annular flange formed from the same piece of sheet metal as the base and extending outwardly from the wall at the point where the wall joins the base; a second annular flange formed from th~
same piece of sheet metal as the wall and base extending out-wardly from the end of the wall remote from the base, said ~09~3~i6 annular flanges defining the ends of the outer surface of the cylindrical wall.
Another aspect of the invention provides a novel method of forming a pulley, which comprises: providing a pulley blank formed o~ sheet metal and having a circular base and a cylindri-cal wall upstanding from the circumference of the base; contacting the upstanding wall with a first roller, said first roller having a main face and receding sloping faces at each end of the main face, while said pulley blank is rotatably retained in apparatus having sloped faces to coact with the sloped faces on the roller;
rotating at least one of the roller and the pulley blank, said , roller and said pulley blank being contacted with sufficient force such that both rotate, while moving the roller inward, ~
whereby said main face of the roller defines a wall in the ' ' pulley blank and the coacting sloped faces on the apparatus and roller define upper and lower flanges bounding said wall;
partially, but not completely, collapsing said wall in an axial direction; providing a cylindrical backing block of smaller diameter than the pulley blank within the pulley blank; contacting ':
.. .. . ... .. .. . . .. . ... ... . . .. . . . ...
the exterior of the partially collapsed wall with th,e face of a second roller to form the blank into a pulley, said roller and ;:, said blank being rotatable and said backing block being rotatable ,:
-~ with the blank, and one of said blank and said roller bein~ caused to rotate, said roller and said blank being contacted with suf-ficient force such that both rotate, while moving the roller in-wardly to a predetermined distance from the backing block, whereby ;~
-~ the roller deforms the metal of the wall completely filling the : space between the roller and the backing block forming a smooth cylindrical interior wall when such roller is at the predetermined distance from the backing block.
The second roller as described above can be smoothly c~lindrical and the predetermined distance can be greater than
- 4 -the thickness of the metal of the base, whereby a smooth-walled pulley with a robust wall thicker than the base and bounded by two flanges is obtained. In another embodiment, the second roller can have circumferential ridges whereby to impart a poly-v groove pattern on the face of the pulley between the flanges. In this case, the predetermined distance (between the part of the roller most closely approaching the backing block to the backing block) can be less than the thickness of the sheet metal of the pulley can, while still giving adequate strength.
In another embodiment, a smooth-walled pulley with a thickened wall is first formed, then this is contacted with a roller having circumferential ridges to give a poly-v grooved pulley.
The invention will be further described with respect to the drawings in which:
Figure 1 represents a sheet of sheet metal which is usable to form a pulley can.
Figure 2 is a cross-sectional view of one form of a pulley can formed from the metal of ~?igure 1.
Figures 2a and 2b show bross-sectional views of alter-; nate forms of the base of the pully can.
Figure 3 shows a cross-sectional view of the pulley can of Figure 2 mounted in a conventional metal spinning apparat-us .
Figure 4a shows a partial cross-sectional view of the can of Figure 2 and Figure 4b shows a partial cross-sectional view of the sa~e can, illustrating a flange-forming step which can optionally be performed prior to partial collapsing of the can.
Figure 5 shows a partial cross-sectional view of the can of Figure 2, showing one method of collapsing the can par-tially.
_ 5 _ 3~i;6i Figures 6a and 6b show a partial cross-sectional view of the can of Figure 2, illustrating successive steps of an alternative way of collapsing the can partially.
Figures 7a and 7b show successive steps in the form-ing of v-grooves in a partially collapsed can.
Figures 8a and 8b show successive steps in thicken-ing the walls of a partially collapsed can without forming v-grooves.
Figure 9 shows the formation of v-grooves in a can after the step of Figure 8.
In its simplest Eorm in manufacturing a pulley suit-able for poly v-belt use on automobiles, a pulley can is formed by deep drawing or spinning, in a conventional way, a sheet of flat metal. The particular sheet metal can be any of those conventionally used in spun pully manufacture. The most common of these are sheet aluminum and hot rolled, commercial quality, low carbon sheet steel. The sheet of sheet metal, s~lch as ` shown in Figure 1, has for example a thickness of 0.080 inch.
Thicker sheet metal can of course be used, and the upper limit to thickness depend5 upon the ultimate use envisaged for the pulley to be made, and the pressures able to be exerted by the drawing and spinning equipment to be used. The use of thin sheet metal (i.e., between 0.070 inch and 0.110 inch in thick-ness) is preferred as the particular advantages of the present ~ invention are much more pronounced when thin sheet metal is used, : as then the invention provides pulleys from such thin sheet metal which have performance characteristics which could otherwise have only been obtained from pulleys made of a thicker grade of the particular sheet metal.
As stated above, a pulley blank (which is henceforth called a "can") is made according to conventional methods on a conventional deep drawing or rolling machine. Such a machine stamps a circular portion out of a sheet of sheet metal 1 (Figure 1) and draws it into a can having a base, and an upstand-ing cylindrical wall. The can may be of any desired dimension, depending upon the size of the e~uipment being used, and the size of the required final pulley. For example, for six inch pulleys (a size often used in automobiles) a circular piece nine inches in diameter is stamped out, and is drawn into a can with a ~.6 inch diameter base and a two inch high wall. A typical can is shown as 15 in Figure 2. The can of Figure 2 has a stepped base portion 10 and upstanding cylindrical wall 11. The base 10 portion 10 is usually pierced in its center by a hole at 12 in ~`~Z
conventional manner, to provide for registration on metal spin- ~-ning equipment. Other holes may be pierced for registration purposes or for use as bolt holes when the pulley is completed.
Additionally, the shape of the base 10 of the can need not be stepped as shown in Figure 2, ~ut may instead be of flat or sloped configuration as shown in Figuxes 2a and 2b. Instead of a single hole, several holes may be pierced in the base in any desired pattern, as shown at 13 in Figure 2b~ If desired, the pulley blank may be fitted with a hub formed of a separate piece 20 of metal, as for example shown in United States Patent 2,696,740 issued December 1, 1954.
According to the method of the invention, the can is placed in a conventional, general purpose, metal spinning machine.
Such machines are available commercially, and will not be illus-trated here. As is usual, the machine is provided with chucks to hold a workpiece for rotation and with tool holders to move sel- -ected tools toward and away from the axis of rotation of the work-piece. The machine is also capable of compressing a work-piece along its axis of rotation.
Figure 3 shows a can of the form of Figure 2 positioned in a metal spinning machine between bottom chuck 20, and top chuck 23. The axis of rotation of the can is shown by the line ~0~356 a-a through the chucks and the c~n. As is common in the pulley spinning art, the can is correctly oriented so that its axis of rotation is the centre axis of the cylindrical can wall. Such orientation can be achieved by means of a can holding groove 21 in the bottom chuck 20, and a central spindle 24 extending from chuck 23 and engaging hole 12, or by any other known means. ~`
If desired, cylindrical internal support block 60 may be secured to the chuck 20 for rotation therewith. The block 60 has an indentation 61, to house spindle 2~ when chucks 23 and 20 ~ 10 are moved together a predetermined distance.
`~ It is preferred, for reasons to be described later, that the inner side of groove 21 be sloped, rather than vertical, ~ as indicated at 25 in Figure 3. Top chuck ~3 also has a sloping ; annular portion 26 facing the slope 25, also as shown in Figure .
If desired, a step of forming outer and inner 1anges in the pulley wall can be carried out before thickening of the wall and forming the grooves in it. Such a step is not absolutely necessary, as flanges can conveniently be formed during the course of subsequent steps of pulley formation, as will be described.
; However, it is sometimes convenient to form the flanges first, as this may permit better control of the partial collapse of the pulley wall, as described later.
- 7a -.: ` ~ ; ;
~ ~O~q~3~ii ~ .
The step of flange formation is shown in Figures 4a and 4b. Fi~ure 4a shows a can positioned as shown in Fiyure 3, but with a roller 50 approaching it. The roller 50 is rotatablP about an axis c-c parallel to a-a and is movable toward and away from axis a-a. The roller 50 has a generally cyllndrical smooth outer face 51, and two sloped portio~s 52 and 53 each adjacent to the cylindrical face 51 as shown in Figure 4a. Alternately,-the face of the roller can be slightly concave if desired. As is known in ;~~
the art, such a roller can be mounted on springs, so that it can move axially up and down slightly in response to pressures on its 1~ periphery. In the example shown, the roller is unpowered.
The chucks 20 and 23 are rotated simultaneou$1y, at the same speed and in the same direction, carrying with them the can 15 and block 60. As this rotation is occurring, the roller 50 is ` moved into contact with the wall 11 of the can 15. Simultaneously, t chuck 23 is moved downwardly a predetermined distance, so that, as the face 51 contacts the can wall :Ll and continues to move inwardly, the metal at the ]oin between base 10 and wall 11 ~shown at 16) is folded over by the pressure of the xoller 51 bearing against the I can. The sloping portion 52 of the roller helps fold over the 20 metal at 16 smoothly, to form a flange. Similarly, the sloping portion 53 helps form a flange smoothly at the end 17 of the can wall which is most remote from the base. The roller 50 is mv~ed ; inwardly toward the axis a-a a predetermined amount, having regard to the amount of downward movement of the chuck 23, so that the areas 16 and 17 of the wall 11 are folded into the position ~hown in Figure 4b, without undue stretching. Preferably (but not nec-essarily) the internal block 60 extends outwardly just sufficiently so that its external face 62 provides a backing support for the wall 11, when the roller 50 is at the innermost limit of it5 30 travel toward the axis a-~. It is preferred, however, that the block 60 should be of such a height that there is a gap, indicated .. , , . . _ .
a3 63 between the base 10 and the block 60 after this operation, so that the chuck 23 can be moved in subsequent steps of the pulley formation closer to the chuck 20, without the necessity of changing blocks 60. Ho~ever, instead of leaving a space 63, it is also possible to dispense completely with the block 60 during the step shown in Figures 4a and 4b, or else, after completion of the step shown in Figures 4a and 4b, to remove the block 60 and replace it with a block having a smaller vertical height, before going on to further steps.
The steps shown in Figures 4a and 4b creat~ two ~langes, 18 and 19, with a flat portion 117 between them. It will be noted that the flange 19 lies along the sloping portion 25 of the chuck 20 and is in fact formed between the sloping portion 53 of the roller 50 and the sloping portion 25 of the chuck 20. The slope of portion 25 should be pre-chosen so that it will provide a smooth back to assist in formation of flange 19.
As stated above, the step shown in Figures 4a and 4b is optional. It has the effect of accurately sizing two flanges 18 and 19, which flanges are found to be useful in pulleys for poly v-belts, as they help to retain the poly v-belt in position when the pulley is ultimately formed. In the subsequent ~escription, it will be assumed that the step of flange fo~mation as shown in - Figures 4a and 4b has not been carriea out, but it will ~e under-stood by one skilled in the art that the steps to be described can be carried out with a pulley blank`having flanges 18 and 19 as ob~ained from the carrying out of the steps shown in Figures 4a and 4b.
If the step of Figures 4a and 4b is not carried out, the first step to be performed on a pulley can in the process according to the invention is the partial collapsing of the wall 11 of the pulley can 15. Such partial collapsing can be carried out in several ways. One way (which is not preferred) is by a step of bulging the can as shown in ~. S. Patent 2,929,345 of _ g _ ~ ' , ~ ~9~L3S;~;, ~. ~
Zatyko, dated March 22, 1960. This step is not preferred as it requires special equipment, which must be specially mounted on the spinning machine for the purpose of the step, and subsequently removed so that other steps can be carried out. An alternative, and also not preferred manner, is simply to apply axial pressure to the chuck 23, causing the wall 11 to buckle, as shown a~ 112 in Figure 5. The buckling occurs in an irregular manner. The block 60 need not be present ~uring the operation of partial col-lapse of the wall 11 to the approximate shape shown at 112, but it can be present if desired. As will be obvious to one skilled in the art, the irregular buckling could also be carried out after ~- flanges 18 and 19 have been formed by the method shown in Figures 4a and 4b.
An alternative, and preEerred manner of partially collapsing the wall 11 is shown in Figures 6a and 6b. Figures 6a and 6b show a pair of rollers 31 and 32, which rotate about an axis b-b. These rollers are separated from one another b~ a compression spring 33. Each of the rollers has a face with a sloping portion 34, a blunt extension 35, and a curved portion 36, which is lo-cated nearest the other roller. The two rollers are separated by ~ the spring 33 a distance such that the projections 35 will engagewall 11, when the rollers 32 and 33 are moved to~ether toward the wall, at fairly widely spaced points on wall 11.
In the partial collapse of the can wall according to the .
method of Figures 6a and 6b, the chucks 20 and 23 are powered to rotate the can 11, and the rollers 31 and 32 are moved into contact with the can 11. As the rollers contact the can 11, they will of course begin rotating as well, as the rotation of the can 11 will cause them to xotate. The projections 35 will of course be the first portions of rollers 31 and 32 to contac. the can wall 11.
As soon as the portions 35 have contacted the wall, the chuck 23 is moved toward the chuck 20, at the same time as the rollers 32 3~;6 , ~ .
and 31 are moved togethPr toward the axis a-a. This will cause the can wall 11 to buckle, and, at the same time, the buckling will be controlled somewhat by the fact that the projections 35 will tend to stay in contact with the same portion of the can ~all that they originally contacted,with the spring 33 compressing as the chuck 23 moves toward the chuck 20. This will cause the ; can wall to lie along the contour of the curved roller face 36, as shown in Figure 6b. The amount by which the rollers 31 and 32 should approach the axis a-a, and the design of the contours 36 and the amount of movement of the chuck 23 will be obvious to a man skilled in the art. It is generally preferred to have the rollers 31 and 32 end up in face to face contact with one ~nother, so that no point or burr on the metal is formed by a gap between the two faces 36~ such as indicated at 37. However, if a burr or point i-R
formed, this is not detrimental, as lt will be removed during the later processing steps. After the rollers 31 ana 32 are withdrawn further controlled collapse can be carried out by moving the chucks 20 and 23 c~oser to one another by a desired amount.
The form of partially collapsed wall formed by the method of Figures 6a and 6b is shown in Figure 6b at 113. It will ~e noted that the shape of the collapsed wall is somewhat more regular than is formed by the method of Figure 5. Herein-after, further steps of the invention will be described with respect to a wall of form 112, but it is understood that thi~
disclosure applies equally to a wall of form 113.
No matter which method is used to collapse the wall, it is preferred that the wall 11 be collapsed so that is final height (hl)(see Figure 5) is from 25~ to 75~ of its original height h (see Figure 2~. If a flange has been formed by the step of Figure 4 prior to the collapse, the ncollapsed" height hl includes the height of the flanges 18 and 19. Conveniently, the height of block 60 is such that, after collapse has occursed by the desired amount, the block is in contact with the base 10 of the can, as shown in Figures 5 and 7a~ ~
. , 3~6 ~
, ~
Once the wall has been collapsed into the shape 112 or 113, the operator can, according-to the invention, either perform on it the steps of Figures 7a and 7b to obtain a final pulley suitable for US2 with a poly-v-groove belt, or else the steps of Figures 8a and 8b to obtain a pulley having a thickened up-right wall and which is suitable for use with a flat belt. If the steps of Fi~ures 8a and 8b are carrie~ out, a subsequent step can (if desired) be carried out as is shown in Figure 9, to con-vert the pulley thus fonned into one suitable for use with a poly v-belt.
Referring now to Figures 7a and 7b, one method of for-ming a pulley suitable for use with a poly v-belt from a col-lapsed can having the configuration 112 or 113, will now be des-cribed. Figure 7a shows a roller 40, which rotates about an axis d-d, parallel to the axis a-a. The face of roller 40 is provided with a number of sharp projections 41, spaced from one another by v-shaped indentations 4~. The number and shape of projections 41 is the same as the number and shape of projections on the poly v-belt with which the pulley to be made is intended to be used.
In the example shown in Figure 7a, there are six projections 41 separated by five indentations 42, in the sa~e configuration as is used in a common type of v-belt. The top of the roller 40 has a sloped transition surface 43 between its face and its top.
Similarly, there is a sloped transition surface 44 between the face and the bottom of the roller.
The chucks 20 and 23 are set into motion simultaneously and in the same direction, causing the partially collapsed can to rotate. The axis d-~ is then moved toward the axis a-a. ~en the face of the roller 40 comes in contact with the can, the roller also begins to rotate~ The surface 43, as it engages the can, squee~es a portion 114 of the met~l of the can wall against the sloped surface 26 of upper chuck 23, forming a flange~ Similarly;
~ . .
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the sloped surface 44 squeezes a portion 115 of metal against the sloped surface 25 of bottom chuck 20, forming a bottom flange. These two flanges are identical with the flanges formed at 18 and 19 in the step described with respect to Figure 4. If the step of Figure 4 has been carried out, and the flanges are already formed, the sloped portions 43 and 44 merely nest against the pre-existing flanges, and do little if any deforma-tion of metal.
The sharp projections 42 cut into the metal of the can -wall 112, and deform it. If the can wall were not partially col-lapsed, i.e., if it were in the same state as is shown in Figure 2 at 11, the sharp projections would cut deeply into the thin sheet metal of the wall. If the sheet: metal were relatively thin, i.e., below about .110 inch, ancl the depth of the inden-tations 42 from the projections 41 was approximately .125 inch, insufficient metal would flow into the indentations 42 to fill such indentations before the sharp projections 41 cut entirely through the metal o~ wall 11, or else approached so nearly to cutting through the wall as to render the wall 11 extremely weak.
However, according to the method of the invention, the collapsed portion 112 of the wall provides more metal than a straight cylindrical wall would do. This gives sufficient metal, even when sheet metal of initial thickness of 0.080 inch is used, to fill completel~ 0.125 inch indentations at 42, while still re-taining a strong wall.
The roller 40 is moved towards axis a-a until the in-dentations 42 have all been filled with metal. The final form of the can wall is shown in Figure 7b. It will be noted that there is an appreciable thickness of metal indicated by the distance y between the points 41 and the inside 116 of the can wall which now rests firmly against the exterior wall 62 ~9~3Si~ii of the backing block 60. The indentations 42 are fully filled with metal of the wall, as shown by the dimension x. Generally speaking, where the height h, is from .25 to .75 of the height h, a thickness of wall plus projections (dimensions y plus x in Figure 7b) of from about 1.5 to 2.5 of the thickness of the original sheet metal can be obtained for sheet metals in the thickness range of about .070 inch to 0.130 inch. The relative size of dimensions y and x will of course depend on the size, shape and number of projections 42, and upon how close to the wall 62 and the roller 40 is allowed to approach. In order to obtain a strong pulley for use in an automobile, the roller 40 is allowed to approach the wall 62 only closely Pnough so that the minimum wall thickness 7 will be 0.040 inch. A smaller minimum thickness would of course be permissible if the pulley were designed for uses requiring less strength.
During the operation of Figure 7, the backing block 60 is extremely important, as its wall 62 assists in distri-buting the metal of can wall 112 so that it fills all of the indentations 42.
2a - 13 - (a) .
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.
~; After the roller 40 has come to the position of Figure 7b, it is removed, and the pulley can, which has now been fully formed into a pulley suitable for use with a poly v-belt, is removed. It will be noted that the pulley thus formed has two flanges, 18 and 19, ~Jhich give it considerable dimensional stabil-ity, and has a series of grooves (the mirror image of projections 41 and indentations 42 of the roller) for use with a poly v-belt.
An alternative arrangement, for use in making a pulley with a fl~t face, is shown in Figures 8a and 8b. Turning first to Figure 8a, a roller 70, rotating around an axis e-e which is i parallel to axis a-a is shown. This roller has a flat face 71 and two sloped portions 72 and 73. Portion 72 joins thè flat face 71 to the top of the roller, whereas portion 73 joins ~he ~; flat face to the bottom of the roller. The width of the face 71 is just slightly smaller than the width of the face 62 of backing block 60, and the slope of the sloped surfaces 72 and 73 are chosen having regard to the slopes of surface 2~ and 25 with which they will C0-2Ct to form flanges.
The chucks 20 and 23 are caused to rotate simult~r.eously and in the same direction, carry;~g the can 20 with them. The axis e-e of the roller 70 is caused to move toward the axis a-a, ~ith t~e roller oriented opposite the can as shown in Figure 8a.
`~ The flat face 71 contacts the collapsed portion 112 of the can -wall, pushing it against wall 62 of backing bloc~ 60. Simulta-neously, sloped surface 72 of roller 70 squee~es a portion of the metal of the can wall ag~inst surface 26 of chuck 23, to form a flange, and surfacP 73 squeezes a portion of the metal of the 3D can wall against sloped surface 25, also forming a flange~
Because of the bulged or partially collapsed surface of the wall of the can, ~here is more metal than would be needed merely to .
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3~S
make a flat wall of the same thickness as the metal of the base.
Thus, when the roller 70 approaches the wall 62, a thick, smooth wall of metal 111 is formed, having smooth surfaces against faces 71 and 62. The advance of the roller 70 is stopped at a pre-determined place having regard to the amount of collapse which has been carried out in forming the buckled or collapsing wall 112, such that the newly formed wall 111 will be of a de-sired thickness. Generally, the thickness obtained will be some-what in excess of the sheet metal forming the base 10 (excluding any strengthening members or hubs) such as about from 1 1/4 to 2 times (preferably 1 1/3 to 1 1/2 times) the thickness of the base 10. Obviously, if the roller 70 were advanced closer to the axis a-a, excess metal could squeeze out around the edges of the roller, leading to a thinner wall 111, but this would not be desirable, and does not form part of this invention. ~laving regard to the teachings herein, a person skilled in the art can easily detérmine the amount of collapse required to give a suitable thickness 111, as he may re~uire.
If the flanges 18 and 19 have been preformed, as shown in Figures 4a and 4b, then the faces 72 and 73 will not in them-selves form flan~es, but will merely mate smoothly against the pre-existing flanges 18 and 19, preventing metal from escaping from the area between face 62 and face 71, where the new, thicker wall 111 is bein~ formed.
A~ter the condition shown in Figure 8b has been reached, the roller 70 is withdrawn, and the pulley can is removed from `
the chucks 20 and 23. A pulley can having a smooth, robust wall 111 has been formed, which is suitable as a pulley for a flat belt. The pulley also has flanges 18 and 19, which serve to retain the belt i~n~y~ce.
.,_ 3~
It will be noted that the steps of Figures 7 and 8 each result intrinsically in a pulley having flanges 18 and 19 ; Generally, it is preferred to retain these flanges, and one of ~ the advantages of the invention is that the flange reduces the possi-. - - - -- 15 - (a) .. . :,: . .
o ~ ~ ~
35~ ~
t bility of slippage of v-belts from pulleys formed according to the invention. However, it is possible, if desired~to remove the flanges 18 and 19 by means of a roller which nips of the flanges (as is known in ~he spun pulley art for removing unwanted flanges or burrs2 or by other conventio~al methods. Therefore, althoush the flanges form a very desirable part of the invention, it is un-derstood that unflanged pulleys also can be made by a process according to the invention.
If desired, instead of removing the pulley as formed with wall 111 from the chucks 20 and 23, the pulley can instead be subjected to the application of roller 40, as shown in ~ig. 9.
following the steps shown in Figures 8a and 8b. The roller 40 ap- -proaches in a manner similar to that described with respect to Fig-ures 7a and 7b, but, onthis occasion, it engages flat, thick wall 111, rather than the buckled wall 11~. However, the result obtained is the same as was obtained by the steps described in Figures 7a and 7b, as can be seen b~y comparing Figure 9 to Figure 7b.
In the foregoing disclosure, the contacting of the various rollers with the surface of the can wall has been accomplished by rotating the two chucks 20 and 23 at the same speed and in the same direction, entraining the can 15 along with them. The roller ~` or rollers which then contact the surface of the can wall (such as, for example rollex 40 or roller 70) are freely rotatable, but are not powered. When they contact the can wall they are caused to rotate by their contact with the rotating can, at the same speed as the rotating can. It is of course within the scope of the invention to have the chucks 20 and Z3 freely rotatable, and in-stead to power the roller which approaches the can wall. Alter-nately lalthough this is not preferred) both the roller and the chucks 20 and 23 could be powered so that both the can and the roller are caused to rotate. The directions of rotation should preferably be such ~hat, at thP point of contact of the r~ller .
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and the can, the two are moving in the same direction. Ho~ver, they need not be mo~ing at exactly the same speed, and, under some circumstances/ it is even possible to obtain good results with the can and the roller moving in differen~ directions, al-though this is not preferred.
Certain examples of the makin~ of pulleys according to the disclosure given herein will now be given.
EXAMPLE I
A can of the form shown in Figure 2 is drawn by conven-tional means from sheet steel of thickness 0.080 inches to have awidth of 6.6 inches and a height h of 2.0 inches. The can is col-lapsed according to the step shown in Figure 5 to a height hl of 1.0 inch. 1'he method steps with respect to Figure 7a and 7b are then preformed on the can using a roller 40 having six grooves spaced - ~.140 inches from one another and having a depth of indentation 42 of 0.140 inches. The roller 40 is moved toward axis a-a until the dis-tance between wall 62 and the projections 42 is 0.050 inches. When the roller 40 is removed and the can is removed from the chucks, it is found to be a well formed grooved pulley having t~o fIanges (18 and 19 in the drawings) of approximately 6.6 inches in diameter and a central v-belt receiving portion having an avera~e diameter of 6.0 inches and having six grooves corresponding to projections 41. Each of these grooves is 0-140 inches in depth, and the total depth of metal measured from the bottom of a vee to the inside of the can (the distance y in Figure 7b3 is 0.050 inches. The variation of - depth be~ween the six v-grooves is insignificant, being less than .002 inches. The dimensions are substantially constant around the diameter o~ a pulley.
EXAMPLE II
A sheet of sheet steel Q.080 inches in thickness is ~reformed into a can of the,sa~e~sh~pe as t`h,~t descripea in Ex-~ample I~ The can is collapsed according to the step shown in Figure S to a height h~ of 1-0 inch. The steps illustrated in Figures 8a and ~ 3,56~ ~
8b are carried out on the c~n. The roller 70 is allowed to approach the wall 6n such that the distance between face 71 and face 62 is 0.120 inches. When the roller 70 is withdrawn, and the can i5 removed from the chucks 20 and 22 J it is found to have a v~belt receiving portion 6.0 inches in diameter and two flanges approximately 6.6 inches in diameter at each side of the v-belt receiving portion. The thickness of the wall of the v-belt re-ceiving portion is 0.120 inches, and the pulley is smoothly cylin-: drical in its v-belt receiving portion.
EXAMPLE III
A pulley formed according to the teachings of Example II is treated by a subsequent step as illustrated in Figure 9 and the associated disclosure. The roller 40 is permitted to approach so that the projections 42 are a distance of 0.050 inches from the face 62~ When the roller is withdrawn and the can is removed from the chucks 20 and ~3, a poly v-belt pulley which is indis-tinguishable from the pulley formed in Example I is formed.
Each of the pulleys formed in Examples I, II and III is found to be highly resistant to bein~ forced out of round,and is ` 20 judged to be suitable for automotive and indeed heavy truck appli-` cations.
It is understood that the invention is not limite~ to ` the exact roller structure shown, nor to the exact pulley shapes iIlustrated, because the particular shapes of the rollers can be varied to provide other structural embodiments without departing from the scope of the present invention.
Having now described the features of the invention~ and the construction and operation of the preferred embodiments of the novel method and the products provided by them, the inventor wishes it understood that the protection claimed is not limited to the exact emhodiments shown, but includes such modifications thereof as will be obvious to persons skilled in the art, and I
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35i6 . I
that the protection claimed is therefore limited only as set out in the appended claims.
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In another embodiment, a smooth-walled pulley with a thickened wall is first formed, then this is contacted with a roller having circumferential ridges to give a poly-v grooved pulley.
The invention will be further described with respect to the drawings in which:
Figure 1 represents a sheet of sheet metal which is usable to form a pulley can.
Figure 2 is a cross-sectional view of one form of a pulley can formed from the metal of ~?igure 1.
Figures 2a and 2b show bross-sectional views of alter-; nate forms of the base of the pully can.
Figure 3 shows a cross-sectional view of the pulley can of Figure 2 mounted in a conventional metal spinning apparat-us .
Figure 4a shows a partial cross-sectional view of the can of Figure 2 and Figure 4b shows a partial cross-sectional view of the sa~e can, illustrating a flange-forming step which can optionally be performed prior to partial collapsing of the can.
Figure 5 shows a partial cross-sectional view of the can of Figure 2, showing one method of collapsing the can par-tially.
_ 5 _ 3~i;6i Figures 6a and 6b show a partial cross-sectional view of the can of Figure 2, illustrating successive steps of an alternative way of collapsing the can partially.
Figures 7a and 7b show successive steps in the form-ing of v-grooves in a partially collapsed can.
Figures 8a and 8b show successive steps in thicken-ing the walls of a partially collapsed can without forming v-grooves.
Figure 9 shows the formation of v-grooves in a can after the step of Figure 8.
In its simplest Eorm in manufacturing a pulley suit-able for poly v-belt use on automobiles, a pulley can is formed by deep drawing or spinning, in a conventional way, a sheet of flat metal. The particular sheet metal can be any of those conventionally used in spun pully manufacture. The most common of these are sheet aluminum and hot rolled, commercial quality, low carbon sheet steel. The sheet of sheet metal, s~lch as ` shown in Figure 1, has for example a thickness of 0.080 inch.
Thicker sheet metal can of course be used, and the upper limit to thickness depend5 upon the ultimate use envisaged for the pulley to be made, and the pressures able to be exerted by the drawing and spinning equipment to be used. The use of thin sheet metal (i.e., between 0.070 inch and 0.110 inch in thick-ness) is preferred as the particular advantages of the present ~ invention are much more pronounced when thin sheet metal is used, : as then the invention provides pulleys from such thin sheet metal which have performance characteristics which could otherwise have only been obtained from pulleys made of a thicker grade of the particular sheet metal.
As stated above, a pulley blank (which is henceforth called a "can") is made according to conventional methods on a conventional deep drawing or rolling machine. Such a machine stamps a circular portion out of a sheet of sheet metal 1 (Figure 1) and draws it into a can having a base, and an upstand-ing cylindrical wall. The can may be of any desired dimension, depending upon the size of the e~uipment being used, and the size of the required final pulley. For example, for six inch pulleys (a size often used in automobiles) a circular piece nine inches in diameter is stamped out, and is drawn into a can with a ~.6 inch diameter base and a two inch high wall. A typical can is shown as 15 in Figure 2. The can of Figure 2 has a stepped base portion 10 and upstanding cylindrical wall 11. The base 10 portion 10 is usually pierced in its center by a hole at 12 in ~`~Z
conventional manner, to provide for registration on metal spin- ~-ning equipment. Other holes may be pierced for registration purposes or for use as bolt holes when the pulley is completed.
Additionally, the shape of the base 10 of the can need not be stepped as shown in Figure 2, ~ut may instead be of flat or sloped configuration as shown in Figuxes 2a and 2b. Instead of a single hole, several holes may be pierced in the base in any desired pattern, as shown at 13 in Figure 2b~ If desired, the pulley blank may be fitted with a hub formed of a separate piece 20 of metal, as for example shown in United States Patent 2,696,740 issued December 1, 1954.
According to the method of the invention, the can is placed in a conventional, general purpose, metal spinning machine.
Such machines are available commercially, and will not be illus-trated here. As is usual, the machine is provided with chucks to hold a workpiece for rotation and with tool holders to move sel- -ected tools toward and away from the axis of rotation of the work-piece. The machine is also capable of compressing a work-piece along its axis of rotation.
Figure 3 shows a can of the form of Figure 2 positioned in a metal spinning machine between bottom chuck 20, and top chuck 23. The axis of rotation of the can is shown by the line ~0~356 a-a through the chucks and the c~n. As is common in the pulley spinning art, the can is correctly oriented so that its axis of rotation is the centre axis of the cylindrical can wall. Such orientation can be achieved by means of a can holding groove 21 in the bottom chuck 20, and a central spindle 24 extending from chuck 23 and engaging hole 12, or by any other known means. ~`
If desired, cylindrical internal support block 60 may be secured to the chuck 20 for rotation therewith. The block 60 has an indentation 61, to house spindle 2~ when chucks 23 and 20 ~ 10 are moved together a predetermined distance.
`~ It is preferred, for reasons to be described later, that the inner side of groove 21 be sloped, rather than vertical, ~ as indicated at 25 in Figure 3. Top chuck ~3 also has a sloping ; annular portion 26 facing the slope 25, also as shown in Figure .
If desired, a step of forming outer and inner 1anges in the pulley wall can be carried out before thickening of the wall and forming the grooves in it. Such a step is not absolutely necessary, as flanges can conveniently be formed during the course of subsequent steps of pulley formation, as will be described.
; However, it is sometimes convenient to form the flanges first, as this may permit better control of the partial collapse of the pulley wall, as described later.
- 7a -.: ` ~ ; ;
~ ~O~q~3~ii ~ .
The step of flange formation is shown in Figures 4a and 4b. Fi~ure 4a shows a can positioned as shown in Fiyure 3, but with a roller 50 approaching it. The roller 50 is rotatablP about an axis c-c parallel to a-a and is movable toward and away from axis a-a. The roller 50 has a generally cyllndrical smooth outer face 51, and two sloped portio~s 52 and 53 each adjacent to the cylindrical face 51 as shown in Figure 4a. Alternately,-the face of the roller can be slightly concave if desired. As is known in ;~~
the art, such a roller can be mounted on springs, so that it can move axially up and down slightly in response to pressures on its 1~ periphery. In the example shown, the roller is unpowered.
The chucks 20 and 23 are rotated simultaneou$1y, at the same speed and in the same direction, carrying with them the can 15 and block 60. As this rotation is occurring, the roller 50 is ` moved into contact with the wall 11 of the can 15. Simultaneously, t chuck 23 is moved downwardly a predetermined distance, so that, as the face 51 contacts the can wall :Ll and continues to move inwardly, the metal at the ]oin between base 10 and wall 11 ~shown at 16) is folded over by the pressure of the xoller 51 bearing against the I can. The sloping portion 52 of the roller helps fold over the 20 metal at 16 smoothly, to form a flange. Similarly, the sloping portion 53 helps form a flange smoothly at the end 17 of the can wall which is most remote from the base. The roller 50 is mv~ed ; inwardly toward the axis a-a a predetermined amount, having regard to the amount of downward movement of the chuck 23, so that the areas 16 and 17 of the wall 11 are folded into the position ~hown in Figure 4b, without undue stretching. Preferably (but not nec-essarily) the internal block 60 extends outwardly just sufficiently so that its external face 62 provides a backing support for the wall 11, when the roller 50 is at the innermost limit of it5 30 travel toward the axis a-~. It is preferred, however, that the block 60 should be of such a height that there is a gap, indicated .. , , . . _ .
a3 63 between the base 10 and the block 60 after this operation, so that the chuck 23 can be moved in subsequent steps of the pulley formation closer to the chuck 20, without the necessity of changing blocks 60. Ho~ever, instead of leaving a space 63, it is also possible to dispense completely with the block 60 during the step shown in Figures 4a and 4b, or else, after completion of the step shown in Figures 4a and 4b, to remove the block 60 and replace it with a block having a smaller vertical height, before going on to further steps.
The steps shown in Figures 4a and 4b creat~ two ~langes, 18 and 19, with a flat portion 117 between them. It will be noted that the flange 19 lies along the sloping portion 25 of the chuck 20 and is in fact formed between the sloping portion 53 of the roller 50 and the sloping portion 25 of the chuck 20. The slope of portion 25 should be pre-chosen so that it will provide a smooth back to assist in formation of flange 19.
As stated above, the step shown in Figures 4a and 4b is optional. It has the effect of accurately sizing two flanges 18 and 19, which flanges are found to be useful in pulleys for poly v-belts, as they help to retain the poly v-belt in position when the pulley is ultimately formed. In the subsequent ~escription, it will be assumed that the step of flange fo~mation as shown in - Figures 4a and 4b has not been carriea out, but it will ~e under-stood by one skilled in the art that the steps to be described can be carried out with a pulley blank`having flanges 18 and 19 as ob~ained from the carrying out of the steps shown in Figures 4a and 4b.
If the step of Figures 4a and 4b is not carried out, the first step to be performed on a pulley can in the process according to the invention is the partial collapsing of the wall 11 of the pulley can 15. Such partial collapsing can be carried out in several ways. One way (which is not preferred) is by a step of bulging the can as shown in ~. S. Patent 2,929,345 of _ g _ ~ ' , ~ ~9~L3S;~;, ~. ~
Zatyko, dated March 22, 1960. This step is not preferred as it requires special equipment, which must be specially mounted on the spinning machine for the purpose of the step, and subsequently removed so that other steps can be carried out. An alternative, and also not preferred manner, is simply to apply axial pressure to the chuck 23, causing the wall 11 to buckle, as shown a~ 112 in Figure 5. The buckling occurs in an irregular manner. The block 60 need not be present ~uring the operation of partial col-lapse of the wall 11 to the approximate shape shown at 112, but it can be present if desired. As will be obvious to one skilled in the art, the irregular buckling could also be carried out after ~- flanges 18 and 19 have been formed by the method shown in Figures 4a and 4b.
An alternative, and preEerred manner of partially collapsing the wall 11 is shown in Figures 6a and 6b. Figures 6a and 6b show a pair of rollers 31 and 32, which rotate about an axis b-b. These rollers are separated from one another b~ a compression spring 33. Each of the rollers has a face with a sloping portion 34, a blunt extension 35, and a curved portion 36, which is lo-cated nearest the other roller. The two rollers are separated by ~ the spring 33 a distance such that the projections 35 will engagewall 11, when the rollers 32 and 33 are moved to~ether toward the wall, at fairly widely spaced points on wall 11.
In the partial collapse of the can wall according to the .
method of Figures 6a and 6b, the chucks 20 and 23 are powered to rotate the can 11, and the rollers 31 and 32 are moved into contact with the can 11. As the rollers contact the can 11, they will of course begin rotating as well, as the rotation of the can 11 will cause them to xotate. The projections 35 will of course be the first portions of rollers 31 and 32 to contac. the can wall 11.
As soon as the portions 35 have contacted the wall, the chuck 23 is moved toward the chuck 20, at the same time as the rollers 32 3~;6 , ~ .
and 31 are moved togethPr toward the axis a-a. This will cause the can wall 11 to buckle, and, at the same time, the buckling will be controlled somewhat by the fact that the projections 35 will tend to stay in contact with the same portion of the can ~all that they originally contacted,with the spring 33 compressing as the chuck 23 moves toward the chuck 20. This will cause the ; can wall to lie along the contour of the curved roller face 36, as shown in Figure 6b. The amount by which the rollers 31 and 32 should approach the axis a-a, and the design of the contours 36 and the amount of movement of the chuck 23 will be obvious to a man skilled in the art. It is generally preferred to have the rollers 31 and 32 end up in face to face contact with one ~nother, so that no point or burr on the metal is formed by a gap between the two faces 36~ such as indicated at 37. However, if a burr or point i-R
formed, this is not detrimental, as lt will be removed during the later processing steps. After the rollers 31 ana 32 are withdrawn further controlled collapse can be carried out by moving the chucks 20 and 23 c~oser to one another by a desired amount.
The form of partially collapsed wall formed by the method of Figures 6a and 6b is shown in Figure 6b at 113. It will ~e noted that the shape of the collapsed wall is somewhat more regular than is formed by the method of Figure 5. Herein-after, further steps of the invention will be described with respect to a wall of form 112, but it is understood that thi~
disclosure applies equally to a wall of form 113.
No matter which method is used to collapse the wall, it is preferred that the wall 11 be collapsed so that is final height (hl)(see Figure 5) is from 25~ to 75~ of its original height h (see Figure 2~. If a flange has been formed by the step of Figure 4 prior to the collapse, the ncollapsed" height hl includes the height of the flanges 18 and 19. Conveniently, the height of block 60 is such that, after collapse has occursed by the desired amount, the block is in contact with the base 10 of the can, as shown in Figures 5 and 7a~ ~
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Once the wall has been collapsed into the shape 112 or 113, the operator can, according-to the invention, either perform on it the steps of Figures 7a and 7b to obtain a final pulley suitable for US2 with a poly-v-groove belt, or else the steps of Figures 8a and 8b to obtain a pulley having a thickened up-right wall and which is suitable for use with a flat belt. If the steps of Fi~ures 8a and 8b are carrie~ out, a subsequent step can (if desired) be carried out as is shown in Figure 9, to con-vert the pulley thus fonned into one suitable for use with a poly v-belt.
Referring now to Figures 7a and 7b, one method of for-ming a pulley suitable for use with a poly v-belt from a col-lapsed can having the configuration 112 or 113, will now be des-cribed. Figure 7a shows a roller 40, which rotates about an axis d-d, parallel to the axis a-a. The face of roller 40 is provided with a number of sharp projections 41, spaced from one another by v-shaped indentations 4~. The number and shape of projections 41 is the same as the number and shape of projections on the poly v-belt with which the pulley to be made is intended to be used.
In the example shown in Figure 7a, there are six projections 41 separated by five indentations 42, in the sa~e configuration as is used in a common type of v-belt. The top of the roller 40 has a sloped transition surface 43 between its face and its top.
Similarly, there is a sloped transition surface 44 between the face and the bottom of the roller.
The chucks 20 and 23 are set into motion simultaneously and in the same direction, causing the partially collapsed can to rotate. The axis d-~ is then moved toward the axis a-a. ~en the face of the roller 40 comes in contact with the can, the roller also begins to rotate~ The surface 43, as it engages the can, squee~es a portion 114 of the met~l of the can wall against the sloped surface 26 of upper chuck 23, forming a flange~ Similarly;
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the sloped surface 44 squeezes a portion 115 of metal against the sloped surface 25 of bottom chuck 20, forming a bottom flange. These two flanges are identical with the flanges formed at 18 and 19 in the step described with respect to Figure 4. If the step of Figure 4 has been carried out, and the flanges are already formed, the sloped portions 43 and 44 merely nest against the pre-existing flanges, and do little if any deforma-tion of metal.
The sharp projections 42 cut into the metal of the can -wall 112, and deform it. If the can wall were not partially col-lapsed, i.e., if it were in the same state as is shown in Figure 2 at 11, the sharp projections would cut deeply into the thin sheet metal of the wall. If the sheet: metal were relatively thin, i.e., below about .110 inch, ancl the depth of the inden-tations 42 from the projections 41 was approximately .125 inch, insufficient metal would flow into the indentations 42 to fill such indentations before the sharp projections 41 cut entirely through the metal o~ wall 11, or else approached so nearly to cutting through the wall as to render the wall 11 extremely weak.
However, according to the method of the invention, the collapsed portion 112 of the wall provides more metal than a straight cylindrical wall would do. This gives sufficient metal, even when sheet metal of initial thickness of 0.080 inch is used, to fill completel~ 0.125 inch indentations at 42, while still re-taining a strong wall.
The roller 40 is moved towards axis a-a until the in-dentations 42 have all been filled with metal. The final form of the can wall is shown in Figure 7b. It will be noted that there is an appreciable thickness of metal indicated by the distance y between the points 41 and the inside 116 of the can wall which now rests firmly against the exterior wall 62 ~9~3Si~ii of the backing block 60. The indentations 42 are fully filled with metal of the wall, as shown by the dimension x. Generally speaking, where the height h, is from .25 to .75 of the height h, a thickness of wall plus projections (dimensions y plus x in Figure 7b) of from about 1.5 to 2.5 of the thickness of the original sheet metal can be obtained for sheet metals in the thickness range of about .070 inch to 0.130 inch. The relative size of dimensions y and x will of course depend on the size, shape and number of projections 42, and upon how close to the wall 62 and the roller 40 is allowed to approach. In order to obtain a strong pulley for use in an automobile, the roller 40 is allowed to approach the wall 62 only closely Pnough so that the minimum wall thickness 7 will be 0.040 inch. A smaller minimum thickness would of course be permissible if the pulley were designed for uses requiring less strength.
During the operation of Figure 7, the backing block 60 is extremely important, as its wall 62 assists in distri-buting the metal of can wall 112 so that it fills all of the indentations 42.
2a - 13 - (a) .
.
.
~; After the roller 40 has come to the position of Figure 7b, it is removed, and the pulley can, which has now been fully formed into a pulley suitable for use with a poly v-belt, is removed. It will be noted that the pulley thus formed has two flanges, 18 and 19, ~Jhich give it considerable dimensional stabil-ity, and has a series of grooves (the mirror image of projections 41 and indentations 42 of the roller) for use with a poly v-belt.
An alternative arrangement, for use in making a pulley with a fl~t face, is shown in Figures 8a and 8b. Turning first to Figure 8a, a roller 70, rotating around an axis e-e which is i parallel to axis a-a is shown. This roller has a flat face 71 and two sloped portions 72 and 73. Portion 72 joins thè flat face 71 to the top of the roller, whereas portion 73 joins ~he ~; flat face to the bottom of the roller. The width of the face 71 is just slightly smaller than the width of the face 62 of backing block 60, and the slope of the sloped surfaces 72 and 73 are chosen having regard to the slopes of surface 2~ and 25 with which they will C0-2Ct to form flanges.
The chucks 20 and 23 are caused to rotate simult~r.eously and in the same direction, carry;~g the can 20 with them. The axis e-e of the roller 70 is caused to move toward the axis a-a, ~ith t~e roller oriented opposite the can as shown in Figure 8a.
`~ The flat face 71 contacts the collapsed portion 112 of the can -wall, pushing it against wall 62 of backing bloc~ 60. Simulta-neously, sloped surface 72 of roller 70 squee~es a portion of the metal of the can wall ag~inst surface 26 of chuck 23, to form a flange, and surfacP 73 squeezes a portion of the metal of the 3D can wall against sloped surface 25, also forming a flange~
Because of the bulged or partially collapsed surface of the wall of the can, ~here is more metal than would be needed merely to .
1~ .
3~S
make a flat wall of the same thickness as the metal of the base.
Thus, when the roller 70 approaches the wall 62, a thick, smooth wall of metal 111 is formed, having smooth surfaces against faces 71 and 62. The advance of the roller 70 is stopped at a pre-determined place having regard to the amount of collapse which has been carried out in forming the buckled or collapsing wall 112, such that the newly formed wall 111 will be of a de-sired thickness. Generally, the thickness obtained will be some-what in excess of the sheet metal forming the base 10 (excluding any strengthening members or hubs) such as about from 1 1/4 to 2 times (preferably 1 1/3 to 1 1/2 times) the thickness of the base 10. Obviously, if the roller 70 were advanced closer to the axis a-a, excess metal could squeeze out around the edges of the roller, leading to a thinner wall 111, but this would not be desirable, and does not form part of this invention. ~laving regard to the teachings herein, a person skilled in the art can easily detérmine the amount of collapse required to give a suitable thickness 111, as he may re~uire.
If the flanges 18 and 19 have been preformed, as shown in Figures 4a and 4b, then the faces 72 and 73 will not in them-selves form flan~es, but will merely mate smoothly against the pre-existing flanges 18 and 19, preventing metal from escaping from the area between face 62 and face 71, where the new, thicker wall 111 is bein~ formed.
A~ter the condition shown in Figure 8b has been reached, the roller 70 is withdrawn, and the pulley can is removed from `
the chucks 20 and 23. A pulley can having a smooth, robust wall 111 has been formed, which is suitable as a pulley for a flat belt. The pulley also has flanges 18 and 19, which serve to retain the belt i~n~y~ce.
.,_ 3~
It will be noted that the steps of Figures 7 and 8 each result intrinsically in a pulley having flanges 18 and 19 ; Generally, it is preferred to retain these flanges, and one of ~ the advantages of the invention is that the flange reduces the possi-. - - - -- 15 - (a) .. . :,: . .
o ~ ~ ~
35~ ~
t bility of slippage of v-belts from pulleys formed according to the invention. However, it is possible, if desired~to remove the flanges 18 and 19 by means of a roller which nips of the flanges (as is known in ~he spun pulley art for removing unwanted flanges or burrs2 or by other conventio~al methods. Therefore, althoush the flanges form a very desirable part of the invention, it is un-derstood that unflanged pulleys also can be made by a process according to the invention.
If desired, instead of removing the pulley as formed with wall 111 from the chucks 20 and 23, the pulley can instead be subjected to the application of roller 40, as shown in ~ig. 9.
following the steps shown in Figures 8a and 8b. The roller 40 ap- -proaches in a manner similar to that described with respect to Fig-ures 7a and 7b, but, onthis occasion, it engages flat, thick wall 111, rather than the buckled wall 11~. However, the result obtained is the same as was obtained by the steps described in Figures 7a and 7b, as can be seen b~y comparing Figure 9 to Figure 7b.
In the foregoing disclosure, the contacting of the various rollers with the surface of the can wall has been accomplished by rotating the two chucks 20 and 23 at the same speed and in the same direction, entraining the can 15 along with them. The roller ~` or rollers which then contact the surface of the can wall (such as, for example rollex 40 or roller 70) are freely rotatable, but are not powered. When they contact the can wall they are caused to rotate by their contact with the rotating can, at the same speed as the rotating can. It is of course within the scope of the invention to have the chucks 20 and Z3 freely rotatable, and in-stead to power the roller which approaches the can wall. Alter-nately lalthough this is not preferred) both the roller and the chucks 20 and 23 could be powered so that both the can and the roller are caused to rotate. The directions of rotation should preferably be such ~hat, at thP point of contact of the r~ller .
7~ D . ~, .
3.56 - O
' . ~ ' . . . .
and the can, the two are moving in the same direction. Ho~ver, they need not be mo~ing at exactly the same speed, and, under some circumstances/ it is even possible to obtain good results with the can and the roller moving in differen~ directions, al-though this is not preferred.
Certain examples of the makin~ of pulleys according to the disclosure given herein will now be given.
EXAMPLE I
A can of the form shown in Figure 2 is drawn by conven-tional means from sheet steel of thickness 0.080 inches to have awidth of 6.6 inches and a height h of 2.0 inches. The can is col-lapsed according to the step shown in Figure 5 to a height hl of 1.0 inch. 1'he method steps with respect to Figure 7a and 7b are then preformed on the can using a roller 40 having six grooves spaced - ~.140 inches from one another and having a depth of indentation 42 of 0.140 inches. The roller 40 is moved toward axis a-a until the dis-tance between wall 62 and the projections 42 is 0.050 inches. When the roller 40 is removed and the can is removed from the chucks, it is found to be a well formed grooved pulley having t~o fIanges (18 and 19 in the drawings) of approximately 6.6 inches in diameter and a central v-belt receiving portion having an avera~e diameter of 6.0 inches and having six grooves corresponding to projections 41. Each of these grooves is 0-140 inches in depth, and the total depth of metal measured from the bottom of a vee to the inside of the can (the distance y in Figure 7b3 is 0.050 inches. The variation of - depth be~ween the six v-grooves is insignificant, being less than .002 inches. The dimensions are substantially constant around the diameter o~ a pulley.
EXAMPLE II
A sheet of sheet steel Q.080 inches in thickness is ~reformed into a can of the,sa~e~sh~pe as t`h,~t descripea in Ex-~ample I~ The can is collapsed according to the step shown in Figure S to a height h~ of 1-0 inch. The steps illustrated in Figures 8a and ~ 3,56~ ~
8b are carried out on the c~n. The roller 70 is allowed to approach the wall 6n such that the distance between face 71 and face 62 is 0.120 inches. When the roller 70 is withdrawn, and the can i5 removed from the chucks 20 and 22 J it is found to have a v~belt receiving portion 6.0 inches in diameter and two flanges approximately 6.6 inches in diameter at each side of the v-belt receiving portion. The thickness of the wall of the v-belt re-ceiving portion is 0.120 inches, and the pulley is smoothly cylin-: drical in its v-belt receiving portion.
EXAMPLE III
A pulley formed according to the teachings of Example II is treated by a subsequent step as illustrated in Figure 9 and the associated disclosure. The roller 40 is permitted to approach so that the projections 42 are a distance of 0.050 inches from the face 62~ When the roller is withdrawn and the can is removed from the chucks 20 and ~3, a poly v-belt pulley which is indis-tinguishable from the pulley formed in Example I is formed.
Each of the pulleys formed in Examples I, II and III is found to be highly resistant to bein~ forced out of round,and is ` 20 judged to be suitable for automotive and indeed heavy truck appli-` cations.
It is understood that the invention is not limite~ to ` the exact roller structure shown, nor to the exact pulley shapes iIlustrated, because the particular shapes of the rollers can be varied to provide other structural embodiments without departing from the scope of the present invention.
Having now described the features of the invention~ and the construction and operation of the preferred embodiments of the novel method and the products provided by them, the inventor wishes it understood that the protection claimed is not limited to the exact emhodiments shown, but includes such modifications thereof as will be obvious to persons skilled in the art, and I
, . . _ . . , . . . -- . . _ _ _ _ .
35i6 . I
that the protection claimed is therefore limited only as set out in the appended claims.
___ : 20 - 19- ~
Claims (10)
1. A sheet metal pulley comprising:
(i) a circular sheet metal base of sheet metal having a predetermined thickness;
(ii) a cylindrical wall upstanding from the base and formed from the same piece of sheet metal as the base, said wall having a smoothly cylindrical inner surface and an outer surface having at least four parallel v-shaped grooves, separated by pro-jections, extending around the cylindrical wall at right angles thereto;
(iii) a first annular flange formed from the same piece of sheet metal as the base and extending outwardly from the wall at the point where the wall joins the base;
(iv) a second annular flange formed from the same piece of sheet metal as the wall and base extending outwardly from the end of the wall remote from the base, said annular flanges defining the ends of the outer surface of the cylindrical wall.
(i) a circular sheet metal base of sheet metal having a predetermined thickness;
(ii) a cylindrical wall upstanding from the base and formed from the same piece of sheet metal as the base, said wall having a smoothly cylindrical inner surface and an outer surface having at least four parallel v-shaped grooves, separated by pro-jections, extending around the cylindrical wall at right angles thereto;
(iii) a first annular flange formed from the same piece of sheet metal as the base and extending outwardly from the wall at the point where the wall joins the base;
(iv) a second annular flange formed from the same piece of sheet metal as the wall and base extending outwardly from the end of the wall remote from the base, said annular flanges defining the ends of the outer surface of the cylindrical wall.
2. A sheet metal pulley as claimed in Claim 1, in which the maximum thickness of the cylindrical wall plus projec-tions is from 1.5 to 2.5 times the thickness of the sheet metal of the base.
3. A sheet metal pulley as claimed in Claim 1 or 2, in which the minimum thickness of the cylindrical wall at any point is less than the thickness of the sheet metal of the base, but greater than 0.040 inch.
4. A method of forming a pulley which comprises:
(a) providing a pulley blank formed of sheet metal and having a circular base and a cylindrical wall upstanding from the circumference of the base;
(b) contacting the upstanding wall with a first roller, said first roller having a main face and receding sloping faces at each end of the main face, while said pulley blank is rotatably retained in apparatus having sloped faces to coact with the sloped faces on the roller;
(c) rotating at least one of the roller and the pulley blank said roller and said pulley blank being contacted with suf-ficient force such that both rotate, while moving the roller in-ward, whereby said main face of the roller defines a wall in the pulley blank and the coacting sloped faces on the apparatus and roller define upper and lower flanges bounding said wall.
(d) partially, but not completely, collapsing said wall in an axial direction, (e) providing a cylindrical backing block of smaller diameter than the pulley blank within the pulley blank;
(f) contacting the exterior of the partially collapsed wall with the face of a second roller to form the blank into a pulley, said roller and said blank being rotatable and said backing block being rotatable with the blank, and one of said blank and said roller being caused to rotate, said roller and said blank being contacted with sufficient force such that both rotate, while moving the roller inwardly to a predetermined distance from the backing block, whereby the roller deforms the metal of the wall completely filling the space between the roller and the backing block forming a smooth cylindrical interior wall when such roller is at the predetermined distance from the backing block.
(a) providing a pulley blank formed of sheet metal and having a circular base and a cylindrical wall upstanding from the circumference of the base;
(b) contacting the upstanding wall with a first roller, said first roller having a main face and receding sloping faces at each end of the main face, while said pulley blank is rotatably retained in apparatus having sloped faces to coact with the sloped faces on the roller;
(c) rotating at least one of the roller and the pulley blank said roller and said pulley blank being contacted with suf-ficient force such that both rotate, while moving the roller in-ward, whereby said main face of the roller defines a wall in the pulley blank and the coacting sloped faces on the apparatus and roller define upper and lower flanges bounding said wall.
(d) partially, but not completely, collapsing said wall in an axial direction, (e) providing a cylindrical backing block of smaller diameter than the pulley blank within the pulley blank;
(f) contacting the exterior of the partially collapsed wall with the face of a second roller to form the blank into a pulley, said roller and said blank being rotatable and said backing block being rotatable with the blank, and one of said blank and said roller being caused to rotate, said roller and said blank being contacted with sufficient force such that both rotate, while moving the roller inwardly to a predetermined distance from the backing block, whereby the roller deforms the metal of the wall completely filling the space between the roller and the backing block forming a smooth cylindrical interior wall when such roller is at the predetermined distance from the backing block.
5. A method as claimed in Claim 4, in which the face of the second roller is smoothly cylindrical, whereby the wall of said pulley is formed with a smoothly cylindrical outer surface.
6. A method as claimed in Claim 5, in which said predetermined distance is from 1 1/4 to 2 times the thickness of the sheet metal of the pulley base.
7. A method as claimed in either of claims 5 or 6, additionally comprising contacting said smoothly cylindrical outer surface with a second roller having at least four parallel ridges around its circumference, while supporting said pulley wall internally, at least one of the pulley and the roller being caused to rotate, said roller and said pulley being contacted with sufficient force so that both rotate and the ridged circum-ference of the roller imparts a pattern of v-grooves to the walls.
8. A method as claimed in Claim 4, in which said second roller is provided with at least four parallel ridges around its circumference and the ridges impart to the wall a pattern of parallel v-grooves, whereby a v-grooved pulley is formed.
9. A method as claimed in Claim 8, in which said predetermined distance (as measured from the part of said second roller which most closely approaches the backing block to the backing block) is less than the thickness of the sheet metal of the base of the pulley can.
10. A method as claimed in Claim 9, in which said predetermined distance is greater than 0.040 inch.
Priority Applications (10)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA293,232A CA1094356A (en) | 1977-02-04 | 1977-12-16 | Method of pulley manufacture and product |
| ES496437A ES496437A0 (en) | 1977-02-04 | 1980-10-31 | AN IMPROVED METHOD OF MANUFACTURING A PULLEY WITH MULTIPLE THROATS OR V-SLOTS. |
| DE3042312A DE3042312C2 (en) | 1977-02-04 | 1980-11-10 | Method for producing a multi-groove V-belt pulley and device for carrying out the method |
| GB8036768A GB2087270B (en) | 1977-02-04 | 1980-11-17 | Method of manufacturing pulleys |
| JP55161492A JPS5788929A (en) | 1977-02-04 | 1980-11-18 | Pulley and its manufacture |
| BR8007886A BR8007886A (en) | 1977-02-04 | 1980-12-02 | MULTI-V PULLEY AND A PULLEY MANUFACTURING PROCESS |
| FR8026023A FR2495508B1 (en) | 1977-02-04 | 1980-12-08 | PROCESS FOR MANUFACTURING PULLEYS BY ROLLING FROM A METAL SHEET AND PULLEYS THUS OBTAINED |
| IT50357/80A IT1127953B (en) | 1977-02-04 | 1980-12-12 | Pulley for multiple belt drive |
| CA368,331A CA1126541A (en) | 1977-12-16 | 1981-01-12 | Method of pulley manufacture and product |
| CA000402458A CA1222889A (en) | 1977-12-16 | 1982-05-06 | Method of pulley manufacture and product |
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA271068 | 1977-02-04 | ||
| CA293,232A CA1094356A (en) | 1977-02-04 | 1977-12-16 | Method of pulley manufacture and product |
| DE3042312A DE3042312C2 (en) | 1977-02-04 | 1980-11-10 | Method for producing a multi-groove V-belt pulley and device for carrying out the method |
| GB8036768A GB2087270B (en) | 1977-02-04 | 1980-11-17 | Method of manufacturing pulleys |
| FR8026023A FR2495508B1 (en) | 1977-02-04 | 1980-12-08 | PROCESS FOR MANUFACTURING PULLEYS BY ROLLING FROM A METAL SHEET AND PULLEYS THUS OBTAINED |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1094356A true CA1094356A (en) | 1981-01-27 |
Family
ID=27508083
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA293,232A Expired CA1094356A (en) | 1977-02-04 | 1977-12-16 | Method of pulley manufacture and product |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS5788929A (en) |
| CA (1) | CA1094356A (en) |
| DE (1) | DE3042312C2 (en) |
| FR (1) | FR2495508B1 (en) |
| GB (1) | GB2087270B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110038995A (en) * | 2019-04-11 | 2019-07-23 | 柳州市龙杰汽车配件有限责任公司 | CVT speed changer driven pulley piston multistation forming technology |
Families Citing this family (28)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5790459A (en) * | 1980-11-21 | 1982-06-05 | Nippon Spindle Mfg Co Ltd | Manufacture of grooved v-pulley |
| JPS57195551A (en) * | 1981-05-26 | 1982-12-01 | Nippon Spindle Mfg Co Ltd | Production for grooved pulley |
| JPS5854898B2 (en) * | 1981-06-18 | 1983-12-07 | アイシン精機株式会社 | Manufacturing method of V-ribbed pulley |
| JPS5924542A (en) * | 1982-07-30 | 1984-02-08 | Sanden Corp | Forming method of electromagnetic clutch rotor |
| JPS5926629A (en) * | 1982-08-06 | 1984-02-10 | Sanden Corp | Molding method of electromagnetic clutch rotor |
| US4551122A (en) * | 1983-02-22 | 1985-11-05 | Dyneer Corporation | Manufacture of poly-V sheet metal pulleys and product |
| DE3334349A1 (en) * | 1983-09-22 | 1985-04-11 | Goshi Kaisha Kanemitsu Doko Yosetsusho, Akashi, Hyogo | Method for the production of multiple V-belt pulleys |
| JPS60108130A (en) * | 1983-11-16 | 1985-06-13 | Kojima Press Co Ltd | Manufacture of pulley made of sheet metal |
| JPS60184438A (en) * | 1984-03-02 | 1985-09-19 | Kanemitsu Doukou Yousetsushiyo:Goushi | Manufacture of multi-grooved v-pulley made of sheet metal |
| JPS60184437A (en) * | 1984-03-02 | 1985-09-19 | Kanemitsu Doukou Yousetsushiyo:Goushi | Method for thickening peripheral wall of multi-grooved v-pulley made of sheet metal |
| US4631946A (en) * | 1984-03-02 | 1986-12-30 | Kabushiki Kaisha Kanemitsu | Method of manufacturing sheet metal made poly-V pulleys |
| JPS60227943A (en) * | 1984-04-26 | 1985-11-13 | Kanemitsu Doukou Yousetsushiyo:Goushi | Production of plateworked product having screw part |
| JPS61283431A (en) * | 1985-06-08 | 1986-12-13 | Nippon Isueede Kk | Manufacture of pulley |
| JPS626727A (en) * | 1985-07-02 | 1987-01-13 | Kanemitsu:Kk | Manufacture of v-pulley made of sheet metal provided with v-groove and multi-v-groove |
| JPS626725A (en) * | 1985-07-02 | 1987-01-13 | Kanemitsu:Kk | Manufacture of v-pulley made of sheet metal provided with v-groove and multi-v-groove |
| JPS62254940A (en) * | 1986-04-30 | 1987-11-06 | Yanai Seiko Kk | Manufacture of rotor for electromagnetic clutch |
| DE3819957C2 (en) * | 1988-05-27 | 1996-03-21 | Winkelmann & Pannhoff Gmbh | Process for manufacturing a pulley |
| WO1991000155A1 (en) * | 1989-06-28 | 1991-01-10 | Kabushiki Kaisha Kanemitsu | Method of manufacturing sheet metal poly-v-groove pulleys and products obtained thereby |
| DE3991700C2 (en) * | 1989-07-11 | 1998-10-01 | Kanemitsu Akashi Kk | Method of forming lugs of sheet metal poly-v-groove-pulley |
| DE4135606C1 (en) * | 1991-04-08 | 1992-06-25 | Wf-Maschinenbau Und Blechformtechnik Gmbh & Co Kg, 4415 Sendenhorst, De | Blank forming mechanism for V-belt pulley - has tool with slidable counter bearing ring, supporting workpiece edge region |
| DE4244720A1 (en) * | 1992-02-13 | 1994-03-03 | Wf Maschinenbau Blechformtech | Method for manufacture of externally toothed gear |
| DE4205711C3 (en) * | 1992-02-13 | 2000-02-24 | Wf Maschinenbau Blechformtech | Device for producing an externally toothed gear part |
| DE4430733C1 (en) * | 1994-08-30 | 1995-12-14 | Leifeld Gmbh & Co | Method of manufacturing rotationally symmetrical workpiece from tubular blank |
| DE19581564B3 (en) * | 1995-01-27 | 2004-06-03 | Kanemitsu Corp., Akashi | Method of making a multiple V-belt pulley from sheet metal |
| DE19511963C2 (en) * | 1995-03-31 | 2000-12-07 | Leifeld Gmbh & Co | Process for the production of rotationally symmetrical metallic workpieces |
| DE19620178C2 (en) * | 1996-05-20 | 1999-03-25 | Leifeld Gmbh & Co | Method of making a poly-V disc |
| DE19635152A1 (en) * | 1996-08-14 | 1998-03-12 | Wf Maschinenbau Blechformtech | Method and device for producing an externally toothed gear part |
| AU8849701A (en) * | 2000-09-01 | 2002-03-22 | Gates Corp | Method of spinning a pulley from a tubular blank |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE338211C (en) * | 1921-06-16 | Ernst Edelmann | Process for the production of spring houses with reinforced bottom edge | |
| DE227171C (en) * | ||||
| DE644837C (en) * | 1934-09-21 | 1937-05-14 | Mitteldeutsche Flanschenfabrik | Method and device for the production of a wheel disc for pneumatic tires that is uniform with the rim |
| US2929345A (en) * | 1950-01-03 | 1960-03-22 | Sr Frank Zatyko | Method for making sheet metal v-pulleys |
| US2696740A (en) * | 1950-02-18 | 1954-12-14 | Lester T Zatko | Hubbed sheet metal pulley |
| US2892431A (en) * | 1955-02-17 | 1959-06-30 | Automatic Steel Products Inc | Apparatus for forming multi-groove pulleys |
| US3368376A (en) * | 1965-11-26 | 1968-02-13 | Eaton Yale & Towne | Method and apparatus for making pulleys |
| US3851366A (en) * | 1973-04-09 | 1974-12-03 | East Dayton Tool & Die Co | Method of pulley manufacture |
| US3953995A (en) * | 1975-05-27 | 1976-05-04 | Haswell John W | Means for making double groove pulleys |
| US3977264A (en) * | 1975-07-23 | 1976-08-31 | Aspro, Incorporated | Method of making poly-v pulleys and product |
| JPS5659546A (en) * | 1979-10-22 | 1981-05-23 | Kanemitsu Doukou Yousetsushiyo:Goushi | Production of poly v-pulley made by plate working |
| JPS56131032A (en) * | 1980-03-17 | 1981-10-14 | Kanemitsu Doukou Yousetsushiyo:Goushi | Producing device for pulley made of sheet metal |
| JPS56143863A (en) * | 1980-04-09 | 1981-11-09 | Sato Shoji Kk | Manufacturing of multi-v-grooves pulley for use in transmitting power force |
-
1977
- 1977-12-16 CA CA293,232A patent/CA1094356A/en not_active Expired
-
1980
- 1980-11-10 DE DE3042312A patent/DE3042312C2/en not_active Expired
- 1980-11-17 GB GB8036768A patent/GB2087270B/en not_active Expired
- 1980-11-18 JP JP55161492A patent/JPS5788929A/en active Granted
- 1980-12-08 FR FR8026023A patent/FR2495508B1/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110038995A (en) * | 2019-04-11 | 2019-07-23 | 柳州市龙杰汽车配件有限责任公司 | CVT speed changer driven pulley piston multistation forming technology |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3042312C2 (en) | 1984-02-16 |
| GB2087270B (en) | 1985-04-11 |
| FR2495508B1 (en) | 1988-04-01 |
| JPS5788929A (en) | 1982-06-03 |
| JPH0261340B2 (en) | 1990-12-19 |
| DE3042312A1 (en) | 1982-08-19 |
| FR2495508A1 (en) | 1982-06-11 |
| GB2087270A (en) | 1982-05-26 |
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