SI9300564A - Fuel filter and/or lubricating oil filter for internal combustion engines - Google Patents

Abstract

A filter for motors and / or lubricants is described internal combustion engine. This filter consists of the receiving part attached to the base plate, a cover that is movably connected to the base plate, and support pipes mounted on the lid or base board. There is a filter cartridge attached to this support tube, consisting of a cylindrically shaped core and a non-metallic core upper and lower end panels. This filter the cartridge is in contact with the sealing element on the lid. It is not necessary to replace the entire filter, it is only necessary periodically replacing the filter cartridge.

Description

The invention relates to a filter for propellants and / or lubricants for an internal combustion engine.

DE-OS 34 29 634 discloses a filter for motors and / or lubricants. This filter consists of a housing in which the filter cartridge is stored and sealed with a lid. The filter cartridge is connected to the lid on one side and the bottom of the housing on the other by means of a layer of adhesive. Such filters, however, must be replaced at intervals and replaced with new filters.

The removal of such filters, also known as exchange filters, in particular for the filtering of oil in motor vehicles, is causing increasing problems.

Such a filtei 'consists of elements made of different materials, e.g. sheet metal housing, steel cover, paper bag and various plastic parts. In addition, a certain amount of oil remains in the filter after use, which cannot be removed from the filter. Given that waste treatment has priority over conventional waste disposal, to the extent that such recovery is technically feasible and recoverable, there is a need to dismantle such complete filters and to ensure that individual parts of such a filter are removed. However, such a process is very expensive, and considerable amounts of recycling material are generated.

The basis of the invention was the task of making a filter, which would describe the defects eliminated and give a good basis for the processing of its components.

This task will be solved by the features in the main claim of the filter described.

The basic idea of the present invention is the possibility of re-opening and closing the filter housing, thus removing only the filter cartridge, which mainly consists of filter paper.

In the design of the invention, it is contemplated to connect the support tube directly to the base plate or cover element. A filter cartridge would attach to this resistant tube. This tube is used to consolidate the position of the filter cartridge on the one hand, and on the other hand as a support element for the filter cartridge in case of pressure differences between the flowing crude oil and the refined oil or. fuel.

In the best sense, the base plate is analogous to the base plate of the exchange filter. The advantage is that the receiving part of the element does not need to be modified to receive the exchange filter when the corresponding filter is used instead of the exchange filter.

In accordance with the further development of the invention, however, it is possible to form a separable joint between the cover element and the base plate as a simple thread or bayonet lock. In the case that the thread on the cover element is formed as an internal thread, it can also be formed in segments for ease of manufacture along the scope, which means that only certain places in the segment areas are provided with threads. It is strongly recommended that such a thread be made on a cover element made of injection molded plastic such that the injection tool has a tapered stem and that tapered stem is provided with a longitudinal slide having embedded threaded structures.

When forming the lid part, the conical stem is first pulled back, and then the longitudinal scroll moves inward, thereby releasing the lid part.

A further development of the invention envisages the provision of a support tube on the attachment side with a backrest made in a convex structure to form a sealing element for the bottom of the filter insert facing this sealing element. In this way, no additional sealing element is needed, such as e.g. sealing rubber, round gasket or something. For most filters, a drainage hole or a fluid outlet is desirable. oil through which fuel or oil can escape from the filter housing even after the filter cartridge has been removed. Clearly, this drain hole must be tightly closed when the filter is operating. In the light of the still further embodiment of the invention, it is therefore provided that the bottom or filter cartridge forehead. The bottom of the cartridge seals the drain hole, and as soon as the cartridge is lifted out of the housing, the bottom of the cartridge releases the drain hole.

However, it is very useful to use the inside of the support pipe for a bypass valve. This bypass valve, however, can be provided with a coarse filter in the form of a strainer or strainer that prevents the flow of heavily soiled raw fluid into the area already cleared.

Depending on the various uses, the filter is mounted in a suspended position, i.e. the portion with the lid pointing approximately in the direction of the center of gravity. For this installation, it is advisable to drain the oil or oil in the filter before opening the filter. fuel. To do this, unscrew the drain screw located on the lid and wait for the contents to drain from the filter housing.

In the further development, the sealing element on the base plate must be fitted with a deflection plate, which has the task of changing the direction of the flowing oil due to possible damage (destruction) of the filter cartridge at this location due to excessive pressure of the oil and unwanted lifting of the filter cartridge from its sealing seat.

The filter according to the invention is also distinguished by the fact that the replacement of the filter cartridge not only removes the part from the lid but also the possibility to unscrew the entire filter from its receiving part, for example when we want to replace a defective part. However, in order not to remove the entire filter from the base plate when removing the cover, the base plate is attached to the receiving part by self-locking and can only be separated by the use of high force or. using a special separating tool from the receiving part.

These and other features of the envisaged further developmental stages of the invention are not only contemplated in the claims, but also derive from the description and drawings, the individual features being presented either individually or in a series of sub-combinations in an embodiment of the invention, useful as well as to protect the proper embodiment for which we require protection at this site.

Embodiments of the invention are presented in the drawings and are described in more detail below.

This is how it shows

picture 1.) section through oil filter with replace the living cartridge picture la. ) section through oil filter with interchangeable cartridge picture lb. ) section through oil filter variant with radial

Figure 1 c. ) Figure 2a + b Figure 3.) Figure 4.) Figure 5.) Figure 6. ) gasket oil filter with backflow block oil filter option with integrated strainer filter another variant with integrated strainer partial cross section through oil filter partial cross section through oil filter with centered filter cartridge and cross section through exchangeable image filter 6a.) Cross section through a filter that can be opened Fig. 7.) partial cross section through an oil filter with self-sealing insert Fig. 8a + b.) Cross section and an outline of the oil filter housing cover and bayonet lock

Figure 1) shows an oil filter such as e.g. used to clean oil in cars. The oil filter consists of a base plate (10), which in our case is screwed to the receiving part (11), marked by lines. A filter cover (13) is screwed onto this base plate by means of a saw thread (12). A seal (14) is provided for sealing the entire housing at the end of the thread (12). The base plate is e.g. aluminum and the cover (13) is of injection molded plastic. For cleaning, the oil provided flows through the bore (15) of the support part (11) and the bore (16) on the base plate (10) into the space for the uncleaned fluid (17), flows through a star-shaped filter cartridge (18) and drains through the support pipe. (19) and through the return flow stop valve (20) to the middle bore (21) of the filter receiving part.

A sealing element (22) is provided for sealing the space for uncleaned fluid between the base plate and the receiving part against the environment. The filter cartridge (18) is a star-folded cartridge made of paper or web, which has a termination plate (23), (24) at both ends, e.g. can be made of cardboard. These two endplates are connected to the filter insert (18) by a glued joint (25) and (26). The filter cartridge is attached to the support tube (19). This support tube is e.g. from a sheet metal that is screwed onto the supporting part (27). The support part (27) is firmly connected to the interface (28). This interface, however, is attached by means of a snap joint (29) to the cylindrical nozzle (30) of the lid (13), the pressure spring (31) resting on the one side on the lid (13) and on the other side ( 28) exerts an axial force on the support part (27) such that the entire tightly fitting filter insert (32) remains between the support part (27) and the sealing plate (33).

The sealing plate (33) is a portion of a molded sheet that is attached to the cylindrical extension (34) of the base plate (10). This sealing plate (33) seals directly with its sealing edge (35) of the end plate (24). On the opposite side of the filter cartridge (32), a circular sealing edge (36) of the supporting part (27) is provided as a sealing element. Also, this sealing sleeve (36) creates a seal directly with the end plate (23). A filter with strainer plates (37) and plates (38) and (39) is provided between the support part (27) and the interface (28). The holes (40) are arranged on the carrier part (27) inside this filter. In case the overpressure in the filter cartridge (32) increases due to complete clogging or due to the cold engine, the concentrated oil intended for cleaning does not flow sufficiently through the filter cartridge, the oil will pass through the filter with strainer plates (37). bores (40) and through the bypass valve (41) into the backflow shut-off valve (20) past the filter cartridge (32,).

The bypass valve is configured to react only at a specified differential pressure between the unrefined part and the already refined part. This pressure is e.g. set to 2.5 bar. This prevents the incompletely refined oil from flowing through the filter with strainer plates (37) during normal operation and mixing with the already refined oil. The bypass valve (41) consists of a sheet housing (42) that is flanged to a support portion (27) in which the valve spring (43) presses the valve plate (44) into the seat of the valve (45) so that it seals tightly.

The backflow shut-off valve (20) is similarly constructed, but here the valve opening pressure is significantly lower. It means, e.g. 0.1 bar. This shut-off valve has the function of preventing oil from leaking from the engine oil channels when the engine is stationary.

To replace the filter cartridge (32), remove the cover (13) from the base plate (10). On the removed cover (13) there is a support part (27) and an interface (28), as well as a support tube (19) with a filter insert (32) attached thereto. The filter cartridge can be removed from the support tube and replaced with a new one. After replacing the filter cartridge, replace the cover (13) on the base plate (10). However, the replaced filter cartridge can be removed by a thermal process. By using cardboard end plates and using filter paper, it is not necessary to disassemble the filter cartridge into its components, as is the case with filters having metal end plates.

The drawings shown show similar built filters. In order to avoid repetition, we always describe here only the essential features that deviate from the examples described above.

The oil filter variant shown in Figure 1) is a filter insert (18), the lower and upper end plates (23) and (24) of which not only cover the front but also the smaller area of the axial extension of the filter insert (18). In this range, the end plates (23) and (24) assume the function of sealing. The end plate (24) lies on the extension (34) of the base plate and acts much like a radial seal. Likewise, the end plate (23) fits into the cylindrical surface of the support part (27) and in this case also assumes the function of a seal. This radial seal has the advantage that the length tolerances of the filter cartridge (18) do not affect the function of the oil filter alone.

Figure lc.) Shows a filter in which the filter insert (18), in conjunction with the spring (31), acts as a shut-off valve for reverse flow. The spring (31) exerts an axially directed force on the filter insert (18) in the direction of the base plate (10). The filter cartridge (18) fits at least one annular roll (105) on the base plate. This annular roll (105) encloses a bore (16) through which crude oil flows.

In normal operation, due to the pressure of the crude oil, the filter cartridge (18) is lifted off the annular coil (105) to open access to the crude oil. The moment the pressure in the crude oil drops, i.e. when the internal combustion engine is stationary, the end plate (24) closes the bore (16) and thus prevents backflow or. drainage in the oil filter. The end plate (24) is as described in Figure lb. ) designed to tighten radially.

In Figure 2a.), The variant of the oil filter with the base plate (10) and the lid (13) contains, instead of a filter with strainer plates, a strainer (46) extending into the support tube (19). The base plate is provided with a circular sealing edge (47). The filter insert end plate (48) fits into it. On the opposite side of the filter cartridge (32), the sealing plate (49) has the function. However, this sealing plate is provided with a sealing edge (50). The pressure spring (51) presses against the sealing plate (49) in the direction of the filter insert so as to ensure reliable sealing of the end plate (52) at the sealing edge (50). A drain screw (53) is provided on the cover (13). Normally, the filter is mounted in a suspended position. Before opening the lid, this drain screw (53) can be unscrewed so that the oil inside the filter housing can drain. Then unscrew the lid from the base plate (10). The filter cartridge (32) can be removed and replaced with a new one.

Figure 2b.) Shows the detail of the discharge screw (53) on the cover (13), which is made of plastic material and is provided with a sleeve (54) and a hexagonal connection. This bush is curled on the outside. To seal the bushing on the cover (13), a groove (55) is provided in which a circular ring is fitted. The discharge screw (53) may also be formed as a hexagonal Allen screw instead of a hexagonal screw.

Figure 3) is another variant of the oil filter. This one contains a strainer filter (56), which is similar to the filter shown in Figure 1.). An intermediate element (57) is provided to create compressive force on the sealing plate (49). A filter with strainer plates is attached to this intermediate element, as well as a sealing plate (49) and a support tube (19). The intermediate element, however, is clamped into the cylindrical nozzle (58) of the lid (13). A pressure spring (59) is mounted between the lid (13) and the intermediate element (57).

The detail section in the sense of Figure 4) of the oil filter is a filter insert (32) that fits into the opening (60) with its end plate (24). This opening is a drain hole through which the oil contained in the filter housing drains after the lid (13) on the base plate (10) has been unscrewed. During normal filter operation, this opening (60) is closed by the end plate (24). Due to the sealing effect of the end plate (24), an additional sealing element is lost at this point. The opening (60) leads straight back into the crankcase so that smooth oil drainage is ensured

The detail section in the sense of Figure 5) shows a filter insert (32), where a sealing plate (61) with a centering edge (62) is provided in the base plate (10). As mentioned above, when replacing the filter cartridge (32), a new filter cartridge is attached to the support tube (19) and the cap (13) is screwed onto the base plate (10) with a new filter cartridge (32), and it is recommended to adjust the filter insert (32) and the support tube (19) with the centering edge (62) in the correct position so that they properly fit into their place.

Figure 6) represents a section through an exchangeable filter that can be opened. In this case, there is provided a base plate (63) to which the cover (64) is fastened via a center screw connection (65). A central tube (67) is attached to the base plate (63) at the extension (66). A filter cartridge (70) is attached to this tube. Due to the elasticity of the spring (68) acting on the sealing plate (69), the filter insert (70) fits tightly on the sealing surface (71). Under the sealing surface (71) is a pressure spring (72). This, in conjunction with the valve plate (73), forms a shut-off valve at the inlet port (74). A threaded nozzle (75) is provided on the upper side of the cover (64). A central screw (76) is screwed into this threaded nozzle (75). Use this center screw to secure the cover (64) to the base plate (63) so that it can be removed. To replace the filter cartridge (70), the entire filter, together with the base plate, is unscrewed from the receiving part, which is not moved here, then unscrew the center screw (76) and lift the cover (64) from the base plate (63). Now we can replace the old filter cartridge with a new one. Reassembly is done in reverse order.

In Figure 7), the presented filter is a filter with a housing and a filter cartridge that has no metal parts (77) and is provided with silicone end plates (78) and (79). In the lower area of the filter, this end plate fits into the elastic sealing element (80), while in the upper part the silicone plate fits directly into the lid (81) of the filter housing. The cover (81) is connected to the filter housing (82) by a screw (83). After the cover (81) has been removed, the filter tube (77) can be removed from the center tube (84) and replaced with a new one. In the filter shown here, the inflow of the crude oil (85) is positioned on the side, while the outflow of the refined oil (86) is the central bore.

Figures 8a + b. ) show a bayonet shutter cover (87) on the housing (88). For oil filters with a housing, the cover is often screwed onto the housing. For ease of handling, it is more convenient to make a bayonet bar instead of a screw joint. Such a barrier is presented here. The lid is provided with a gripping element (89) and shows three circumferentially arranged recesses (90), (91) and (92). When closing, we cut these cutouts over the bayonet segments (93), (94) and (95), and rotate the cover (87) by 60 to secure its position on the housing. The seal inside the filter cartridge (96) is sealed by a pressure spring (97) in conjunction with the sealing plate (98). The filter cartridge (96) is fixed in its radial position by means of a medium pipe (99).

To prevent the lid from being opened automatically, cutouts and bayonet segments are arranged in a stepwise direction in the direction of the recording (opening).

FILTEBNEPK MANN & HUMMEL GMBH, Ludwigsburg, GERMANY

Representative:

Λ

1 <t

LEGEND NUMBERED MARK base plate support part saw blade cap seal hole bore hole for liquid liquid filter insert support pipe shut-off valve backflow middle bore seal plate end plate glued joint glued joint carrier spacer joint snap joint snap joint sealing edge sealing edge filter with strainer plate strainer plate strainer hole bore bypass valve sheet housing valve spring valve plate valve seat strainer basket sealing end plate sealing plate edge sealing pressure spring

J end plate exhaust screw blows groove filter on strainer interface adapter nozzle pressure spring opening sealing plate center edge base plate center joint, screw nozzle middle pipe spring sealing plate filter cartridge sealing pressure spring valve plate inlet hole screw nozzle center screw end plate end plate seal element filter housing coupling middle hose inlet crude oil inlet raw oil outlet lid housing gripping cutouts cutouts segments bayonet closures bayonet closures segments bayonet closures filter cartridge pressure spring plate lifting plate pin hook valve body annular coil

Claims (20)

A propellant and / or lubricant filter for internal combustion engines, characterized in that it consists of a baseplate-shaped housing (10) with a lid (13) and a filter cartridge (18) housed inside the filter housing; wherein the cover (13) is movable to the base plate (10) and the filter insert (18) is located between the base plate (10) and the cover (13) in a support position and can be replaced. Filter according to claim 1, characterized in that it is provided with a base plate (10) lying on a support part (11), with a cover (13), with a support tube (19) mounted on the cover (13) or on base plate (10), with cylindrical shaped filter cartridge (18) with non-metallic end plates mounted on this support tube (19) with sealing element (33) on base plate (10) that fits into one of the end plates of the cylindrical filter plate cartridge (18), with an additional sealing element (36) that contacts the second end plate of the cylindrical filter cartridge (18). Filter according to claim 1, characterized in that the base plate (10) is screwed onto the receiving part (11) of the receptacle for removable filter inserts. Filter according to claim 1 or 2, characterized in that the lid part (13) is connected to the base plate (10) by means of a thread (12) or a bayonet lock. Filter according to claim 1, characterized in that the filter cartridge (18) is a washable filter cartridge. Filter according to one of the preceding claims, characterized in that the support tube (19) is provided on the attachment side with a backrest formed as a sealing element. Filter cover part according to claim 4, characterized in that the cover part (13) is made of injection molded plastic with internal thread segments. Filter according to one of the preceding claims, characterized in that the face of the filter cartridge (18) facing the base plate (10) closes the oil drain hole (60) in the mounted state. Filter according to one of the preceding claims, characterized in that a bypass control valve (41) is installed inside the support pipe (19). Filter according to one of the preceding claims, characterized in that a coarse strainer in the form of a strainer (46) or a strainer (38, 39) is inserted before the bypass valve (41). Filter according to one of the preceding claims, characterized in that an oil drain screw (53) is mounted on the lid portion (13). 0.0 Filter according to one of the preceding claims, characterized in that a sealing element is provided on the base plate (10) provided with a deflection plate (100). Filter according to one of the preceding claims, characterized in that the base plate (10) is mounted on the self-locking receiving part (11). Filter according to claim 9, characterized in that the support tube (19) and the sieve plate (37) are designed as a subassembly in such a way that a filter cartridge by-pass valve (101) is integrated into the support tube. and a pressure spring (102) held in place in the middle tube (19) by several locking hooks (103). Filter according to claims 1 and 2, characterized in that the lid part (13) is connected by means of a center screw (65) to the base plate (10). Filter according to Claim 15, characterized in that a backflow shut-off valve for crude oil consisting of a valve plate (73) and springs (72) is attached to the base plate (10). Filter according to claim 15, characterized in that a backflow valve consisting of a valve housing (104), a valve plate (73) and springs (72) is firmly attached to the base plate (10). 18. The filter according to any one of the preceding claims, characterized in that at least one end plate of the filter cartridge is made of a certain plastic material, in particular silicone, which provides stability to the filter cartridge and is further provided with a circular sealing roll, allowing axial elastic sealing of the filter cartridge. against the hood and / or the baseplate. A filter according to one of the preceding claims, characterized in that the filter insert is provided with end plates (23, 24), wherein at least one plate has a radial sealing surface and this sealing surface with a base plate attachment (34) (10) or having a cylindrical extension of the bearing member (27) jointly effective. Filter according to one of the preceding claims, characterized in that the filter insert (18) is supported by a spring (31) acting on the adjacent end plate (24) with radial force and sealed therein in the base plate (10). an oil inlet is installed and forms a backflow shut-off valve on the inflow side of the crude oil. FILTERWERK MANN & HUMMEL GMBH Ludwigsburg, GERMANY Representative: