FR2789729A1 - Oil filter case for crankcase for car has tubular body and rod linking bottom and lid of body - Google Patents

Abstract

Case has tubular body (1) with extremities closed with bottom (2) and lid (3). Bottom and lid are linked together via rod (4) placed in inserts (5). Seals (6) are placed between body, bottom and lid.

Description

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OIL FILTER HOUSING

  The present invention relates to an oil filter housing intended in particular, but not exclusively, for a

crankcase oil filter.

  Such filters are known. they are connected in bypass between a pressurized oil intake and the oil sump which lubricates the engine. The main lubrication circuit includes an oil pump which pumps the oil into the oil pan, connected to a primary filter which filters the oil before directing it to the engine. However, the permeability of such filters is practically limited to fifteen microns so as not to have too great a load resistance. However, the vast majority of impurities have a size much less than 15 microns, 80% of the particles having dimensions between one and five microns. As a result, the filtering currently practiced is not satisfactory, the majority of the particles passing through the filter. The oil must therefore be changed

  at fairly short intervals.

  In order to remedy this drawback, it has already been proposed to add to the primary oil circuit a second filter mounted in parallel to the first which can filter, from the

  casing, particles smaller than 15 microns.

  Such filters exist on the market and they generally consist of paper or textile sleeves

  nonwovens with a nominal permeability of 0.5 micron.

  They allow you to space out oil changes without inconvenience

for the engine.

  Cylindrical bypass filter housings generally made of zamak, in which only the screwed cover is removable, are heavy and, molded, can only be adapted with difficulty with difficulty

  individuals without involving significant costs.

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  A first object of the invention is to overcome this drawback and to allow the production of lighter filters, easier to assemble and disassemble, which can easily adapt to particular problems and a lower manufacturing cost. According to the invention, the oil filter housing comprising a cylindrical body, a bottom and a cover, the bottom comprising an inlet nozzle and an outlet nozzle, is characterized in that the bottom of the housing and the cover

  consist of molded plastic parts.

  By cutting the tubular body to a desired length, it is very easy to obtain the desired capacity

  depending on the volume of the oil pan.

  According to another characteristic of the invention, the bottom and the cover are provided with central metal inserts having threaded central bores, joined by a

  threaded rod on at least its ends.

  This characteristic ensures that the closing contact of the case is always made metal on metal which avoids

  wear that may result from metal-to-plastic contact.

  According to yet another characteristic of the invention, the tubular body, provided with tangential fixing wings, is extruded or stretched on a die. It is made, for example of a light metal such as aluminum, for

example.

  Other characteristics and advantages of the invention

  will appear during the following description of a

  particular embodiment, given only by way of nonlimiting example, with reference to the drawings which represent: - Figure 1, a vertical sectional view of a housing according to the invention;

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  - Figure 2, a perspective view of the housing body; - Figure 3, an end view of the cover; - Figure 4, a vertical sectional view of the cover; - Figure 5, a view of the assembled housing. Throughout the figures, the same references designate the same elements. In FIG. 1, it can be seen that the housing comprises a tubular body 1, the two ends of which are

  closed respectively by a bottom 2 and by a cover 3.

  The bottom 2 and the cover 3 are joined by a rod 4 of traction by means of central inserts 5. Preferably, the rod and the inserts are made of steel. Seals 6 are mounted between the body and the bottom and the covers. In practice, the bottom is force-fitted into the body and only the cover is removable. The body keeps a constant diameter but its length can be adjusted by

  depending on the capacity of the housing.

  The bottom and the cover are, for example, of polyamide loaded with glass fibers (PAV30) and the body 1 is, for example, of aluminum. It could also be made of plastic such as PA or POM. Pressure resistance tests have been carried out which show that the housing withstands a pressure of 30 bars (3 MegaPascals) while the maximum pressure in the housing, when the oil is cold is around 8 bars . The actual filter 7 is mounted around the core constituted by the bosses 8 of the bottom and of the cover. The bottom 2 has central cavities 9 and lateral 10 in which are screwed the nozzles (not shown) connecting respectively with the housing and with an oil pressure tap. An orifice 11 provides the connection between the cavity 10 and the interior of the body, its diameter is, for example, 1.9 millimeter. The screw 4 comprises two radial conduits 12 opening into an open axial conduit 13, corresponding with an outlet conduit 14 connected to the oil reservoir, the diameters of these conduits being, by

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  example of 1.5 millimeters which ensures a flow rate of 0.8 liters / minute. In Figure 2, we see that from the cylindrical body 1 protrude tangentially two wings 18 having perforations 19 through which are passed screws (not shown) to allow attachment of the housing in the vicinity of the engine block. Note that the geometry of the

  body 1 does not require any rework machining.

  Figures 3 and 4 show the cover 3 respectively at the end and in vertical section. Fins 31, six in number in the example shown, allow the cover to be taken and its drive in rotation in order either to tighten it on the screw 4, or to loosen it according to the direction of rotation. This rotation can also be obtained by inserting a suitable key into the cavity

hexagonal 32.

  In FIG. 4, we find the cover 3 with its metal insert 5 in the boss 8. The insert has a front centering hole 15 ensuring good engagement of the insert 5 on the screw 4. This front hole extends to the interior of the insert by a threaded bore 16 intended to receive the corresponding end of the rod 4. Circular ribs 17 ensure good retention of the sleeve

  filtering inside the housing.

  Bypass filtering is carried out as follows. The oil in the reservoir is taken from a point in the oil line, for example at the level of the pressure probe, and passes through the conduit 11 in the body 1, around the filter 7. Under the action of the pressure , it passes through the filter 7 and exits through the circuit 12,13,14 for

return to the oil tank.

  It goes without saying that many variations can be made, in particular by substitution of technical means

  equivalent, without departing from the scope of the invention.

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Claims (4)

  1 oil filter housing comprising a cylindrical body (1), a bottom (2) and a cover (3), the bottom comprising an inlet nozzle and an outlet nozzle, characterized in that the bottom (2) of the housing and cover (3) consist of parts of molded plastic.   2 oil filter housing according to claim 1, characterized in that the bottom (2) and the cover (3) are provided with central metal inserts (5) having threaded central bores, joined by a rod (4) threaded at both ends.   3 oil filter housing according to claim 1 or 2, characterized in that the tubular body (1) is   provided with tangential wings (18) for fixing.   4 oil filter housing according to claim 1 or 2, characterized in that the cover (3) has externally fins (31) surrounding a cavity polygonal (32).