MXPA98010681A - Screw filter with a better retention screw - Google Patents

Abstract

A screw-in filter including an improved base plate, preferably die-cast aluminum, which provides a novel retention groove of the outer package. The base plate comprises a core or center joined to a ring by ribs. The collar provides a generally cylindrical wall and a seating surface that extends radially outwardly therefrom. The cylindrical wall defines an internal wall for the retention groove of the outer packing. The horizontal ribs extending from the upper wall wall provide a novel retaining means for securing and aligning the outer packing in the retaining groove. The base plate of the invention can be used in filters, with or without a hinged lid. The present invention improves the clamping technique for the two types of aluminum in the filters with ba

Description

bpte for the filtered fluid. For the connection with external packs that provide the sealed connection, commonly used threaded base plates have been used, common applications in hydraulics use, and often high strength filters that are adapted for use in high pressure applications. These high-strength filters are used in heavy-duty hydraulic machinery systems for use in industries such as agriculture or construction, for example, a hydraulic circuit for a backhoe loader that speeds up the movement of the shovel. In these Xes applications, the f-* iltro d'ebe has the ability to withstand pressure peaks without bursting and continuous pressure overloads for extended periods without fatigue and without escape Because of the high pressure requirements, it is often desirable to incorporate a base plate (die-cast aluminum) into the filter, however, as discussed, filters with r '* die-cast aluminum base plate have had difficulty providing The retaining groove, while at the same time sufficiently securing the base plate to the can, is now a major element in the bolt-on filters when considering the reliability and convenience of the user. external , 5 which will remain in its position in the filter until P1701 / S8MX is secured or immobilized in a sealing relationship with the mounting adapter of a hydraulic circuit. The outer packaging prevents leakage of fluid between the mounting adapter and the filter. The outer gaskets 5 are commonly placed in the outer packing grooves formed in the connecting end of a filter. One way to form a groove has been to embed the steel sheet of a punched steel crimping cap to form a generally shaped channel. _10 U, as shown in U.S. Patent 5,490,930. The interlocking covers provide an intermediate mechanism for securing the base plate to the can. In the filters that do not use coring caps, a common approach to the formation of the groove has been stuffing a portion of the steel sheet of the canister to form a channel. Another common approach has been to form a «grooved faith directly on the motherboard. Grooves for external packaging commonly include a retaining means for aligning and securing the outer packing in the groove during the installation of the filter. The retention means also prevents the package from falling or coming out of the groove during handling and transport of the filter. So far, filters with aluminum base plate and other filters with motherboard steel have had less acceptable approaches to P1701 / 98MX provide the means of retention. A common approach to providing a retention means has been to further embed the steel sheet of either the can or the binding cap to form a taper or reverse slope or a lip as shown in U.S. Patent No. 4,834,885 , from Misgen et al. This approach is undesirable for many reasons, mainly because there is a need for additional manufacturing and excessive steel sausage. U.S. Patent No. 4,743,347, to Stifelman, shows a different approach for providing the retention means that is used for die cast aluminum base plates. As shown in Stifelman, the vertical ribs are pressed into the internal wall of the groove. The vertical ribs extend straight vertically from the base of the groove to the top of the groove. The vertical ribs have tightly clamped the outer packing against the outer wall of the groove. The approach of the vertical rib has several disadvantages. One of these disadvantages is the difficult task of inserting and removing the outer package from a groove with vertical ribs, because the force must be used to introduce and expel the packaging P1701 / 98MX external groove. The vertical rib approach also has manufacturing difficulties. One difficulty is that small casting tolerances have been necessary for the groove, for the vertical ribs and for the base plate. These small tolerances have been necessary to achieve the proper packing of the package. A small tolerance is also necessary for the outer packaging. These small tolerances undesirably increase the precision needed during the manufacture of the filter. There is a problem with the vertical rib approach. The capture of the external packing can cause problems when the filter is operating in a hydraulic circuit. The packing of the outer packing with separate vertical ribs can cause the packing to be uneven, which can potentially cause leaks, particularly if the small tolerances necessary for the groove and packing are not met. This problem can be amplified, because the metal of the base plate and the flexible packaging material comprise different materials and thermally expand at different rates. An additional particularity common to screw-type filters is that the base plate is attached to the can to prevent leakage and bursting. The clamping technique P1701 / 98MX also transfers the torque of the boat to the base plate allowing installation and removal of the filter. A common way to attach a base plate to the canister has been to use a punched steel sheet crimping cap as an intermediate clamping mechanism. Other designs from the past have fastened the base plate to the boat without a binding cap. Some of these designs have provided die-cast aluminum base plates. U.S. Patent Nos. 5,080,787, 4,743,374 and 4,834,885, generally disclose the formation of an edge or envelope of the open end portion of a can on a preformed shoulder on the base plate. However, both types of filters, filters with and without seaming caps have had disadvantages. More specifically, it has been difficult to sufficiently secure the can to the base plate, while also providing a groove for external packaging. Frequently an excessive amount of forming or shaping of the steel sheet has been necessary in many of the filters to form a U-shaped channel, where additional steel formation is necessary to provide a packing retention means. In aluminum-type baseplates, additional stress-sensitive steel sausage has often been necessary to provide torque transfer.

P1701 / 98MX torsion, because the aluminum-type base plates can not be welded to the steel sheet to provide torque transfer. Excessive or uneven shaping of the steel and, particularly, the shaping of the steel in stress-sensitive areas, can reduce the resistance of the filter. In addition, steel shaping has often required more complex machining and manufacturing that increase manufacturing costs. SUMMARY OF THE INVENTION A general objective of the present invention is to provide a filter with an improved external packing retention means in the structure of the base plate. Another object of the present invention is to provide an improved groove for packing in screw-type filters that allows greater flexibility in the design of the filter. A specific object of the present invention is reduce the tolerances necessary for the retaining grooves in the base plates that have been cast under pressure. Another specific object of the present invention is to reduce the sausage of the steel sheet needed to provide a retention groove for a packing external. P1701 / 98MX In this regard, it is an additional object to limit the sausage of the steel sheet in places sensitive to stress. Another specific object of the present invention is to eliminate the need to tightly grip the outer package in the groove to retain the outer package. To achieve these objectives and objects, a particularity of the present invention is to provide an improved retaining means that is formed as part of the base plate cast under pressure. The retaining means of the present invention comprises horizontal ribs extending from the top of the internal wall of the groove, provided by the base plate. The outer packing can be stretched over the ribs and in the groove, the packing then expands towards the inner wall of the groove. As it expands into the inner wall, the groove retains the packing without tightly grasping the packing and with a limited embedding of the steel to secure and align the packing. The horizontal ribs expand or expand the tolerances and reduce the precision needed to pressure cast a groove in a base plate. It is another feature of the present invention that the retaining means of the present invention can be used in filters with and without the binding cap.P1701 / 98MX The retaining means of the present invention simplifies the design and assembly of the filters both those with a binding cap and those that do not. In these two types of filters, the manufacture and assembly of the rest of the filter is simplified by pressure casting the ribs on the base plate. According to one embodiment, a crimping cap is easily entangled or mated with a base plate to provide a retention groove and torque transfer. The crimping cap provides tabs that fit snugly in receiving or receiving grooves in the base plate. According to another embodiment, a rim portion of the can is bent into the die-casting groove in the base plate. The edge portion is stamped into the groove to provide torque transfer and sufficiently hold the can to the base plate. These and other objects and advantages of the invention will become more apparent from the following detailed description, when considered in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS OR FIGURES Figure 1 comprises a cross-sectional view of a filter having a crimping cap, P1701 / 98MX according to a preferred embodiment of the invention, wherein the hidden lines show a mounting adapter to which the filter is attached. Figure 2 is a sectional and perspective view of a base plate and a binding cap in accordance with a preferred embodiment of the present invention. Figure 3 is a perspective view of the lower part of the base plate unit in accordance with the preferred embodiment of the present invention. Figure 4 comprises a pre-assembled exploded view of a canister housing the filtering element, the base plate and the interlocking lid, in accordance with the preferred embodiment of the present invention. Figure 5 is a fragmentary and enlarged cross-sectional view, taken around 6 of Figure 1 in a pre-crimped state, showing a retention groove without the outer packing inserted. Figure 6 is a fragmentary and enlarged cross-sectional view taken around the section 6 of Figure 1, which best shows an outer package that will be retained by the horizontal pins. Figure 7 is a fragmentary cross-sectional view of a filter illustrating an alternate preferred embodiment of the present invention showing the P1701 / 98MX additional features of resistance increase of a filter of type of engargolado. Figure 8 is a sectional cross sectional view of a filter without a binding cap in accordance with an alternative embodiment of the present invention. Figure 9 is a fragmentary cross-sectional view taken about line 7 of Figure 8 showing the torque transfer means between the can and the base plate. Figure 10 is an enlarged cross-sectional view taken along line 9, which best shows a mechanism for torque transfer. While the invention is susceptible to various modifications and alternative constructions, certain illustrative embodiments thereof have been shown in the drawings and will be described in detail below. However, it should be understood that, there is no intention to limit the invention to the specific forms disclosed but, on the contrary, the intention is to cover all modifications, alternative constructions and equivalents that fall within the spirit and scope of the invention as it is defined by the appended claims. P1701 / 98 X DETAILED DESCRIPTION OF THE PREFERRED MODALITY Turning to the drawings, attention will first be directed to a first embodiment represented in Figures 1-6, which exemplify various particularities of the present invention. For purposes of illustration and referring to Figure 1, the present embodiment of the invention has been shown in the drawings to take the form of a screw-on filter 10 normally used to filter contaminated fluid. The filter is rotated on a threaded portion of a mounting adapter 11 in a fluid circuit. As will be appreciated by those skilled in the art, the mounting adapter 11 includes an outlet for the contaminated fluid and an inlet for the clean fluid. The filter 10 includes a can 12 with deep drawing made of steel sheet with relatively thick gauge. The can 12 has a closed end 14, a longitudinally extending cylindrical side wall 16 and an open end 18. A base plate unit 19, shown separately in more detail in Figures 2 and 3, is attached at the end open 18 of the can 12 and provides a fluid connection to the mounting adapter 11 of the hydraulic circuit. The canister 12 houses a tubular filter element 20 P1701 / 98MX generally concentric to the side wall 16. As shown in the present embodiment, the filter element 20 comprises two end caps 22 and 24, a filter medium 26 suitable for removing contaminants from the fluid and a metal central tube perforated 28. A coil spring 30 is located between the closed end 14 and the filter element 20. The top end cap 22 includes a circular hole 31 which is interlocked or mated with the base plate unit 19. The coil spring 30 compressed between the closed end 14 and the filter element 20, pushes the filter element 20 against the base plate unit 19 thereby compressing an internal seal 32. The internal seal 32 prevents leakage between the base plate unit 19 and the filter element 20 The central tube 28 provides the radial support to the filter element 20. The oil or other contaminated fluid from the mounting adapter 11 flows through the base plate unit. 19 towards the can 12 and along an external flow path, represented by the arrow 33, on the outside of the filter element 20. The fluid pressure forces the oil radially inwardly through the filter element 20, removing the oil from the oil. the pollutants. The clean oil flows upward along an internal flow path, P1701 / 98MX represented by the arrow 35, in the top end cap 22 and flowing through the interior of the base plate unit 19 back to the mounting adapter 11. The filter of this invention can be adapted to hydraulic circuits of High pressure that require high strength on the motherboard. In accordance with the foregoing, the exemplified embodiment provides a base plate 34 which is preferably die cast aluminum. The base plate 34 is shown separated from the filter in Figure 4 and as part of the base plate unit 19 in Figures 2 and 3. Although a steel base plate could function in the present invention, die cast aluminum can provide more easily the improved groove for external packaging and the improved retaining means of the outer package of the present invention. Manufacturing costs are also reduced by aluminum die casting. The design of the base plate 34 of the present invention also simplifies the steps of manufacturing the filter 10 by reducing the machining and parts needed to manufacture the filter 10. The currently incorporated base plate 34 is shown separated from the filter in Figure 4 and as part of the base plate unit 19 in Figures 2 and 3. The present embodiment provides a base plate 34 which serves P1701 / 98MX to various functions. The base plate 34 includes a hub or center 36 with ropes or threads 38 that provide the connection for the mounting adapter 11. The hub or center 36 is hollow, which allows clean fluid to flow from the can 12 to the mounting adapter along the internal flow path 35. The hub or center 36 is intertwined or engages with the hole 31 in the filter element 20. The center includes a lip 41 radially around a middle section of the center 36 and with a larger size that the prificic 33. The filter element 20 is pushed against the lip 41 with an internal seal 32 compressed therebetween. The internal seal 32 prevents leakage of contaminated fluid from the flow path 33 into the clean fluid from the flow path 35. The base plate 34 includes multiple radially extending ribs 42 that attach to the hub or center 36 with a ring 44. A plurality of fluid inlet port holes 46 are defined between the ribs 42 which allows contaminated fluid to flow into the can 12 along the external flow path 33. In the screw-in filters, the filter should resisting leakage and bursting due to fluid pressure inside the canister, while also transferring the torque applied to canister 12 during installation and removal or removal. To attach the base plate 34 to the boat P1701 / 98MX 12, the embodiment exemplified in Figure 1 provides a lock cap 45. The base plate 34 and the lock cap 45 form the base plate unit 19 as shown in Figures 2 and 3. Referring in greater detail to the engagement cap 45, the present embodiment allows simple die-cutting of the metal sheet to form the binding cap 45 with a relatively simple and inexpensive machining. The crimping cap 45 is shown in Figure 4 as it was die cut and in Figures 2 and 3 as it was assembled in the base plate unit 19. Referring now to Figures 2 and 4, it is noted that the crimping cap 45 has a peripheral surface 47 in the shape of a disc, which is generally radially flat. The peripheral surface 47 has an internal diameter that is larger than an external diameter associated with a cylindrical wall portion 48 of the rim 44 of the base plate. The crimping cap 45 includes an outer crimping edge 50 attached in stepped manner to the peripheral surface 47 by a vertical cylindrical wall 52. The peripheral surface 47 includes a plurality of tongues 53 extending axially opposite the vertical wall 52 to be received by the base plate 34. The base plate 34 includes a ring 44 having P1701 / 98 X several structural features interacting and intertwining with the engagement cap 45. The collar 44 includes a peripheral flange 54 extending radially outward from the cylindrical wall 48. The flange 54 provides a seat surface 54a shaped disc generally flat to receive the flat peripheral surface 47. The ring 44 also includes a plurality of slots 56 spaced apart to receive the tabs 53 in a narrow fit shape. The slots 56 are evenly spaced in the flange 44 near a corner 58 between the seat surface 54a of the flange and the wall 48 of the rim. In the baseplate unit 19 shown in Figures 2 and 3, the interlocking lid 45 is tightly fitted on the seating surface 54a where the tabs 53 are tightly adjusted in the grooves 56. The tabs 56 and the receiving slots or 56 provide torque transfer between the crimping cap 45 and the base plate 34. Referring to Figure 3, it is noted that the end portions 60 of the tongues 53 are crimped or crimped to the flange portion 54. of the ring 44 for securing the base plate 34 to the interlocking lid 45. As best seen in Figures 1, 5 and 6, the outer edge 50 is deformed or engargola in the side wall 16 of the can 12 P1701 / 98-IX forming a seam or gasket 62. The seam 62 attaches the seaming cap 45 to the can 12 to secure the base plate in the can 12. The seaming 62 resists the internal pressure to prevent the filter 10 from exploding and the canister 12 moves outwardly from the base plate 34. Although the engargolado 62 may itself be liquid-tight, the present embodiment provides a seaming seal 63 inserted between a neck 65 of the can 12 and the vertical surface 52 for ensure the airtightness to liquids. The seal 63 reduces the fluid pressure on the crimping 62 which also prevents the bursting of the filter 10. The neck 65 is commonly formed during the normal crimping operations of the crimping lid 34 and the side wall 16. The neck 65 has preferably an inner diameter greater than the outer diameter of the rim 44 of the base plate for transferring part of the effort of the can 12 towards the base plate 34 directly without the crimping lid 45. In accordance with the objects, objects and features of a preferred embodiment, the filter 10 provides a retaining groove 64 for receiving an outer package 66 for the present embodiment incorporating a binding cap. The groove 64 is formed by interlocking or engaging the peripheral surface 47 of the interlocking cap 45 on the flange 54 of the base plate 34.

P1701 / 98MX with the tabs 53 fitted through the slots 56. Further shown with details in Figures 5 and 6, the groove 64 has an outer wall provided by the vertical surface 52, a base provided by the peripheral surface 47 and a inner wall 44b provided by ring 44. In accordance with the objects, objects and features of the present invention, the base plate provides a retaining means that reduces many difficulties associated with the formation of groove 64 and the insertion of outer packing 66 As best shown in Figure 2, the retaining means is provided by a plurality of horizontal ribs, referred to herein as legs 68 projecting horizontally outwardly from an upper portion 44a of the collar 44. In the present embodiment, the lugs are uniformly spaced around the upper portion 44a of the ring 44. As best seen in the F 5 and 6, the lugs 68 do not extend to the flange 54, but instead, are recessed back toward an inner wall portion of the ring, indicated at 44b. In this particular embodiment, the lugs 68 are evenly spaced over the grooves 56 with a cut segment indicated at 67 between each lug and groove, so that the lugs are more easily slidably adjusted to P1701 / 98MX through the slots. Because the lugs 68 do not extend to the flange 53, the outer package can be stretched over the lugs or easily pushed past the lugs for insertion into the groove 64. After stretching to the outer package 66 on the lugs and inside. of the groove 64, the package will retain most of its original shape by having a portion indicated at 66a extending radially inward beyond the lugs 68 and towards the wall portion of the groove and ring indicated at 44b. An upper portion of the package indicated at 66b extends above the lugs 68 for engagement with the mounting adapter. As shown in Figure 6, it is not necessary for the package 66 to be in contact with the inner wall 44b, however, as will be appreciated by those skilled in the art, depending on the size and position of the tabs 68, the outer package may making contact with the inner wall 44b of the groove. As shown in Figure 6, the package 66 is in contact with the vertical surface 52. However, it will be appreciated that if the outer package is stretched over the legs 68, the package can be held in place without being in contact with it. the outer wall of the groove as shown. P1701 / 98MX By screwing the filter 10 into the mounting adapter 11, the outer packing 66 deforms and compresses in the groove (not shown) which causes the inner packing portion 66a to expand towards the inner wall and / or a The outer portion of the package, indicated at 66b, expands toward the outer wall 52. Because the packing is not necessary to initially retain the package in the groove, the shape and size of the groove may have a greater variance. One advantage of the groove is that the package may have more space to expand. As best seen in Figures 5 and 6, the present embodiment allows the package to freely expand toward the inner wall 44b. At this point it should be apparent that the present approach to providing a retention groove and a retaining means is improved over the prior art, because forced tampering of the outer package is not necessary. This allows greater tolerances in the pressure casting of the base plate and in the global manufacture of the filter. This also provides greater flexibility in the design of the filter. Although the method of assembling the filter 10 of the present invention has been described above in some detail, the preferred method of assembly described below reduces the steps, parts, and cost of P1701 / 98MX manufacture. The primary components of the assembly process are shown in Figure 4 and are described below. To form the can 12, steel with a relatively thick gauge is packed to provide the cylindrical wall 16, the closed end 14 and the open end 16 having a disc-shaped flange 70 extending axially beyond the side wall, the filter element 20 and then inserts into the can 12. To form the base plate 34, aluminum is pressed under pressure to form the hub or center 36 with a lip 41 (shown in Figure 1) that resides radially around a middle section of hub or center and ring 44 joined by ribs 42 to the center, ring 44 provides retention tabs 68 and flange 54 extending radially outwardly with slots 56. As best illustrated in Figures 2 and 4, it can be seen that the retaining lugs 68 are pressurized directly on and uniformly spaced from the corresponding grooves 68. Eta correspondence relationship between the lugs 68 and the grooves p facilitates easier pressure casting of the base plate, because the corresponding molding die can comprise heart pins (not shown) extending through the slots 56 to the legs 68 P1701 / 98MX from the underside of the rim of the base plate, the lower side is opposite the side of the groove 64. When using core-molding bolts (not shown), the corresponding casting die (not shown) of the plate Base does not need any additional division to provide the slots and pins, which simplifies the casting process. The cords 38 are threaded in the center or hub 36 to provide a connection for the mounting adapter. To form the interlocking lid 45, the steel sheet is punched to interlock or engage with the base plate 34, by providing the outer edge 50 with the end portion 72 extending radially just beyond the wing 70 (shown in FIG. Figures 5 and 6), the outer edge joined by the vertical surface 52 to a peripheral surface 47 with tabs 53 extending from the cylindrical surface 46 spaced apart to interlock or engage with the slots 56. Referring now to Figures 2, 3 and 4 , the base plate 34 and the interlocking lid 45 are intertwined or engaged by locating the peripheral surface 47 in the flange 54. This forms the groove 64. The tabs 53 are received in the grooves 56 to provide torque transfer. To additionally secure the base plate 34 and the cover P1701 / 98MX 45, the end portions 60 of the tabs 53 deform around the collar 44 thereby securing the base plate 34 to the interlocking cap 45 forming the base plate unit 19 with the spline 64. Preferably, A seaming seal 63 can be fitted around the engagement cap 45 prior to insertion into the base plate 34. The base plate unit 19 fits into the can where the hub or center 36 projects into the filter element 20 and an internal seal 32 is compressed between the lip 41 and the filter element 29. While in the exemplified embodiment an internal id 32 is shown, there are other methods for preventing the transfer of fluid between the base plate and the filter. In a pre-assembled condition, best shown in Figures 4 and 5, the can 12 includes a wing 70 extending radially outwardly and the crimping lid 45 includes an outer edge 50 extending radially outwardly, having a end portion 72 extending beyond the flange 70. The outer edge 50 and the flange 70 are crimped by normal crimping operations. In the exemplary embodiment of the present invention, the engagement is performed by deforming inwards the can 12 near the wing 70 to form a neck 65 thereby compressing the seal 63 for engaging, P1701 / 98MX as shown in Figure 6. The end portion 72 of the outer edge 50 is then crimped or folded around ^ the wing 70. The wing 70 and the outer edge 50 are deformed downwardly thus forming a crimping 62 according to 5 shown in Figure 6. An outer packing 66 is then inserted into the groove 64 already preformed when stretching and pushing easily to the packing on the temples and releasing the package in the groove to complete the filter. _10 Turning now to a preferred embodiment exemplified in Figure 7, an improved and preferred resistance filter 100 is exemplified using the novel notches and base plate concepts of Figures 1-6. More specifically, the modality of Figure 7 provides the horizontal retention tabs pressed into a shape similar to that of the embodiments shown in Figures 1-6, but with certain improvements that are intended to provide the high pressure capacity. It can be understood that the filter 100 filter the fluid with much in the same general form as the previous modes depicted in Figures 1-6. However, the filter 100 is provided with multiple preferred features of resistance improvement not provided in Figures 1-6 and the attention will now be directed to these particularities. To the P1701 / 98MX observing Figure 7 it will be appreciated that the novel features provided by the present invention can be adapted for higher, intermediate or lower pressure fluid applications. The preferred resistance improvement features described and shown in Figure 7 provide a filter having a bursting resistance of at least 1000 p.s.i. and an impulse resistance of at least 0-300 p.s.i. for 100,000 cycles. Referring now to the filter in more detail 100 illustrated by Figure 7, it is observed that the base plate 120 is similar to the base plate 34 of Figure 2. The base plate 120 has a central hub 122 connected by ribs 124 to a ring 126. A particularity of improvement of the resistance is that ring 126 includes a thicker flange portion 128 that extends radially outwardly from a cylindrical wall 129 of the ring. In order to provide the clamping mechanism between the canister 130 and the base plate 120, the present embodiment uses a crimping cap 132. The crimping 132 also includes a peripheral surface 133 generally disk-shaped seated in a seating surface portion 128b of the flange 128 to form a groove for external packing. In a similar way to the previous modality, a P1701 / 98MX plurality of tabs 134 of the engaging cap 132 are received by corresponding grooves 135 in the flange 128. However, in the present embodiment, the tabs 134 are generally bent by more than 90 degrees with an end portion 134a further bent around a narrower elongated lower portion of the flange 128a. By further folding the edge portion 134a around the flange portion 128a, the potential problem of the tabs 134 being pushed out of the slots 135, which may result from the high fluid pressure inside the filter 100, is avoided, which pushes the can 130 outwardly and likewise to the crimped lid 132. In this way, bending the tabs 134 by more than 90 degrees further allows the filter 100 to support high pressure surges. Another particularity of improvement of the resistance is that the flange 128 defines a continuous cylindrical channel 136 that extends vertically in the flange 128. The crimping cap 134 has a continuous vertical cylindrical flange 138 dimensioned slightly smaller than the channel 136 and adjusted in the channels 136. The band 136 extends from the peripheral surface 135 in a vertical and stepped shape towards the interior of the can 130. By providing the band 138 and the slit 136, P1701 / 98MX the pressure pushing the boat outwards is released from the band 138 towards the base plate 120 by the walls of the channel 136. As also seen in Figure 7, the cylindrical band 138 provides the tabs 132 fitted in the grooves 130 which extend the tabs further into the filter 100. To minimize the pressure of the fluid on the seaming or gasket 140 preventing leakage and bursting, the inner packing ring seals 142 and 144 are assembled in the filter. The tab 128 has receiving or accommodating conics 146 and 148 for receiving and compressing the internal seals 142 and 144, respectively. The seal 142 is inserted over the crimping cap 134 and compressed against the base plate 120 to prevent fluid transfer between the crimping cap and the base plate. The seal 144 is inserted over the flange 128 and compressed against the canister 133 to prevent transfer of fluid between the canister 133 and the base plate 120. Also shown in Figure 7, there is a steel or plastic ring 150 held in place. its place by the hook portion of the tongue 134a. The ring 150 helps to align and retain the seal 144 during the assembly of the filter. Turning now to Figures 8-10, a preferred embodiment of a filter 200 that does not have a cover P1701 / 98MX crimped but including the novel retention means in the form of multiple horizontally extending pins 202 is exemplified. It can be understood that the filter 200 filters the fluid and retains the outer package in a manner similar to the previous embodiments shown in Figures 1-6. Referring now to the Figure in more detail ~ 8, the filter 210 comprises a simplified base plate 212 which provides a retention groove for external packing and a mechanism for the transfer of the torque. As in the previous embodiments, the base plate 211 comprises a hub or center 214 connected by ribs 216 to an outer ring 218. The ring 218 also includes an inner wall 229 and a flange seating surface 220 that extends outwardly. . However, the base plate currently exemplified is different from the previous embodiment, since the ring 218 includes an outer wall 221 at the outer radial periphery of the seating surface 220 to form a generally U-shaped groove, generally indicated as 222, to receive an outer package 223. The U-shaped groove 222 is generally located between the inner wall 219 of the groove and the external wall 221 of the ring with the seating surface 220 as the lower base.

P1701 / 98MX In accordance with the objects and objects, this embodiment provides horizontal retaining ribs shown as pins 202. The pins 202 are provided by the inner wall 219 of the groove and function in a similar manner as described for the pins 68 of the first modality In this way, it will be appreciated that the groove 222 does not need a reverse inclination or taper in the steel sheet of the outer wall 221 to grip the outer pack 223 tightly against the pins 202 to retain the packing 223. The advantage of not needing the reverse inclination or taper is that the outer stop 221 is much better adapted for other purposes such as fastening purposes. Another additional advantage of the present embodiment compared to other aluminum base plate filters of the prior art is that larger tolerances are acceptable for the pressure cast base plate and for other manufactured components, such as the outer packaging. It can also be seen that the retaining lugs 202 are pressure cast directly on and evenly spaced with corresponding grooves 224. Although the present embodiment does not use the slots 224 for the torque transfer, this correspondence relationship between the pins 202 and the slots 224 P1701 / 98MX allows the easier casting of the base plate 212, because the corresponding molding die can comprise core pins (not shown), which extend through the slots 224 toward the pins 202 to form the bottom side of the rim 218 of the base plate, the bottom side is opposite the side of the groove 223. When using the core core bolts (not shown), the corresponding casting die (not shown) to form the groove 223 it does not need a division to provide the pins 202 which simplifies the casting process. However, it will be understood that a division in the corresponding casting matrix (not shown) for the groove can also be used, which eliminates the grooves 224. A preferred clamping mechanism for the transfer of the torque that it uses to the groove The retainer is also exemplified in Figure 8. As seen in Figure 8, a continuous edge portion 210a of the canister 210 is positioned around the outer wall 221 and in the groove 222 to secure the canister 210 to the base plate 212. Because strong clamping and reverse inclination is not necessary in the outer wall of the groove, the edge portion 210a is easily located in the internal diameter of the outer wall of the groove and is used for P1701 / 98MX torque transfer. The present embodiment provides torque transfer in the structure of the base plate by providing a plurality of groove-like grooves 225 in the inner diameter of the outer wall 221. The preferred embodiment of the grooves is best shown in Figure 9. and it is amplified in Figure 10. It is noted that can rim 210a has segments 226 deformed or stamped in these notches 225 thereby providing torque transfer between the can and the base plate. An advantage of placing the notches 225 in the inner diameter of the outer wall 221 is that the filter failure is less likely. The filter failure is less likely because the pressure stress of the fluid in the can 210 is generally carried by the upper part of the outer wall 221 which corresponds to a portion of the can that does not include the deformed segments 226. The deformation of the boat in a non-uniform manner as with segments 226 can weaken the boat. The segments 226 could potentially decrease the resistance of the filter if stresses were transported through or through the segments as would be the case if the segments and notches were in the external diameter of the outer wall 221. By holding the can directly to the plate base, there is no need for a P1701 / 98MX hinged lid. The present embodiment also shows an approach to reduce fluid pressure and leakage in the engargpladp. To prevent leakage and fluid transfer between the canister 210 and the base plate 212, an inner ring packing seal 228 is compressed between the flange 220 and the canister 210. The flange 220 provides the taper 218a for seal admission 228. To align the base plate 212 and the seal 228 during manufacture, the canister includes a continuous flanged ring 230 supported or accommodated by the taper 228b. The flanged ring 230 engages the corner 218c of the flange to further prevent leakage between the can 210 and the base plate 212.

P1701 / 98MX

Claims (21)

1. NOVELTY OF THE INVENTION Having described the present invention, it is considered as a novelty and, therefore, the content of the following CLAIMS is claimed as property: 1. A filter comprising: a canister having a closed end, a wall lateral cylindrical and an open end, the boat houses a filter element; a unitary base plate attached to the can at the open end, the base plate has a hub or center and an outer ring joined by ribs, the ring includes a vertically extending wall and a flange portion extending radially outwardly from the wall, thereby providing a seating surface; and a packing retaining means projecting horizontally from the top of the wall and recessed towards the wall as the retaining means extends vertically toward the seating surface. The filter according to claim 1, wherein the base plate combined with a steel sheet shape defines an external cylindrical groove generally U-shaped to receive an outer packing ring. P1701 / 98MX 3. The filter according to claim 1, wherein the ring includes an external wall that extends vertically from the seating surface, an outer packing ring is interposed between the outer wall and the wall. The filter according to claim 3, wherein the canister has an edge portion at the open end, the edge portion is folded over the outer wall of the base plate and in a groove to receive the outer package, the portion of edge will be connected by torsion to the outer wall. The filter according to claim 4, wherein the outer wall defines a plurality of notches located in an internal diameter of the outer wall, the edge portion of the can is stamped in the notches. The filter according to claim 1, further comprising a crimping lid, the crimping lid having an outer edge crimped to the can and a disk-shaped peripheral surface fitted to the seat, the crimping lid and the base plate define a cylindrical groove for receiving an outer packing ring. The filter according to claim 6, wherein the interlocking cap has a plurality of tabs, the base plate has a plurality of slots. P1701 / 98MX to receive the tabs, the tabs will be adjusted through the slots and shirred or corrugated to the base plate. The filter according to claim 1, wherein the base plate comprises pressurized aluminum material. The filter according to claim 1, wherein the retaining means comprises a plurality of horizontal retaining ribs crimped radially around the top of the wall. 10. The filter according to claim 9, wherein the base plate further comprises a plurality of openings defined near a corner between the seating surface and the wall, the openings are in a correspondence relation with the horizontal retaining ribs cast under pressure which they are uniformly separated in axial relation to the same. A screw filter comprising: a canister having a closed end, a cylindrical side wall and an open end, the canister housing a filter element, the side wall includes an edge portion at the open end; a unitary base plate having a threaded hub or center and an outer ring, a plurality of P1701 / 98MX ribs connecting the hub or threaded center and the ring, the ring comprises an internal wall joined by a seating surface radially outwardly with an external wall, the internal diameter of the external wall defines a plurality of notches where the portion of the edge of the boat will be edged in the notches; and an outer package interposed between the edge surface and the inner wall. 12. The screw-in filter according to claim 11, wherein the retaining means projects horizontally outwardly from the top of the inner wall and hollows radially inward toward the inner wall as the retaining means extends vertically toward the seating surface. The screw-in filter according to claim 11, wherein the packing retaining means comprises a plurality of horizontal retaining ribs crimped radially around the upper part of the inner wall. The screw-in filter according to claim 13, wherein the base plate further comprises a plurality of openings defined near a corner between the seating surface and the inner wall, the openings being in a ratio of P1701 / 98MX corresponds to the horizontal pressure-cut retaining ribs that are evenly spaced in axial relation to them. 15. The screw-in filter according to claim 11, further comprising an internal ring seal compressed between the base plate and the can. 16. A screw filter comprising: a canister having a closed end, a cylindrical side wall and an open end, the canister housing a filter element; a unitary base plate having a threaded hub and center and an outer ring, ribs join the hub or threaded center and the ring, the ring comprises a generally cylindrical wall and a flange extending radially outward from the cylindrical wall providing this way a settlement surface; a crimping lid attached to the base plate and engargolada to the boat for the transfer of the torque between the base plate and the can, the crimping lid and the base plate define a cylindrical groove to receive an external packing, the cylindrical wall provides a radially internal wall for the cylindrical groove; and a packing retention means to ensure a P1701 / 98MX external packing in the groove, the packing retaining means will be provided by the cylindrical wall of the base plate. The screw-in filter according to claim 16, wherein the packing retaining means projects horizontally outward from the top of the inner wall and is hollowed out towards the inner wall as the packing retaining means extends vertically toward the settlement surface. The screw-in filter according to claim 16, wherein the packing retaining means comprises a plurality of horizontal retaining ribs extending radially outwardly from the top of the cylindrical wall. The screw filter according to claim 18, wherein the base plate further comprises a plurality of openings defined near a corner between the seating surface and the cylindrical wall, the openings being in a correspondence relationship with the retaining ribs horizontal pressure castings that are evenly spaced in axial relation to them. The screw-in filter according to claim 19, wherein the interlocking cap comprises a plurality of tabs and a portion P1701 / 98MX peripheral disk-shaped, the disk-shaped peripheral portion intertwines or engages the seating surface where the tabs fit snugly in the openings, the tabs will be crimped or crimped to secure the base plate to the cover of engargolado. The screw filter according to claim 16, wherein the base plate comprises die cast aluminum material. P1701 / 98MX