JP2009103047A - Engine oil strainer structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce weight of the whole engine by reducing weight of an oil strainer body. <P>SOLUTION: In the oil strainer 57 for passing oil 9 when an oil pump device 8 sucks up the oil 9 in an oil pan 11 and supplies the oil to respective parts of an engine body 3, a first recess 31 having an outlet 33 communicating with a suction passage 25 on an inner surface of a housing 7 of the oil pump device 8 is formed on an outer surface of the housing 7 of the oil pump device 8. A first half body 35 composed at a formation position of the first recess 31 and a second half body 39 mounted to the first half body 35 to cover the first recess 31, having an inlet 49 which the oil 9 enters from the oil pan 11, and formed with a second recess 41 facing to the first recess 31, form an oil flow passage 47 inside. A filter 45 is arranged so as to divide the oil flow passage 47 in two between the first half body 35 and the second half body 39. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a structure of an oil strainer that filters circulating oil of an engine of a vehicle or the like.

  Generally, in an engine such as a vehicle, an oil pan is disposed below the engine body, and an oil strainer is disposed in the oil pan. And, when the oil stored in the oil pan is sucked up by the oil pump device and sent to each part of the engine, foreign substances such as dust and metal powder mixed in the oil are filtered by passing through the oil strainer. .

As such an oil strainer structure, an oil strainer in which a filter is disposed in an internal oil flow path by assembling a first half having an inlet and a second half having an outlet and assembling the oil strainer is assembled. A structure is known in which the downstream end (upper end) of the strainer is fastened to the engine case with a bolt (see, for example, Patent Document 1).
JP 2005-226535 A

  However, in Patent Document 1, the oil strainer in which the first half having the inlet and the second half having the outlet are integrated with each other is attached to the engine case so as to be easily wobbled. . In addition, oil flow passages with the same flow passage cross-sectional area are formed on both sides of the filter, so the oil strainer body becomes larger and heavy as a result, and the connection between the oil strainer body and the engine case is more likely to wobble. . Therefore, in order to prevent the wobbling, it is necessary to increase the strength of the connecting portion by the bolt. As a method for enhancing the strength of the connecting portion, for example, a method of ensuring a large contact area with the engine case by enlarging the area of the flange formed at the upper end of the oil strainer for inserting a bolt can be considered. However, increasing the flange area increases the overall weight of the engine.

  This invention is made | formed in view of this point, The place made into the objective is reducing the weight of the whole engine by reducing the weight of an oil strainer main body.

  In order to achieve the above object, the present invention is characterized in that a recess is formed on the outer surface of the housing that houses the oil pump drive mechanism, and a part of the oil strainer main body is configured by the recess formation portion. .

  Specifically, the present invention includes an oil pump device in which an oil pump drive mechanism driven by an engine is housed in a housing, and an oil strainer disposed on the upstream side of the oil pump device, When the oil in the oil pan is sucked up by the pump device and supplied to each part of the engine, the following solution is taken for the structure of the oil strainer that allows the oil to pass therethrough.

  That is, according to the first aspect of the present invention, the first concave portion having the outflow port communicating with the suction passage of the oil pump device is formed on the outer surface of the housing, and the first concave portion is formed by the first concave portion forming portion. And a second concave portion attached to the first half so as to cover the first concave portion and having an inflow port through which oil from the oil pan flows, and facing the first concave portion An oil strainer main body having an oil flow path formed therein is constituted by the second half body formed with the oil passage, and the oil flow path is divided into two parts between the first half body and the second half body. A filter is disposed on the surface.

  According to a second aspect of the present invention, in the first aspect of the present invention, the first half and the second half are both made of resin and are integrally welded to each other.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, oil from the oil pan flows into the oil flow path of the oil strainer body at the inlet of the second half. It is characterized in that a suction pipe is connected.

  According to a fourth aspect of the present invention, in the oil strainer structure for an engine according to the third aspect, the inlet of the second half is formed to have a larger diameter than the inner diameter of the suction pipe. It is comprised by the internal space of the cyclic | annular protrusion part which protrudes.

  According to the invention which concerns on Claim 1, the 1st recessed part which comprises the 1st half body of the housing outer surface is covered with the 2nd half body. That is, since the housing has an inner / outer double wall structure and an oil flow path is formed therein, it looks as if the oil strainer is composed of a part of the housing. Accordingly, the mounting state of the mounting portion between the housing and the second half is more stable than the case where the oil strainer is mounted in a state suspended from the engine case as in Patent Document 1, and thus the strength of the mounting portion is required. There is no need to increase it. In addition, since the first half is composed of a part of the housing, the weight of the oil strainer body can be reduced, and the overall engine weight can be further reduced, and the number of parts of the oil strainer body can be reduced. This can reduce costs.

  According to the invention which concerns on Claim 2, since the 1st half and the 2nd half are mutually welded integrally, both can be assembled | attached firmly.

  According to the third aspect of the invention, the oil can be surely flowed from the oil pan into the oil flow path by setting the tip of the suction pipe soaked in the oil in the oil pan.

  According to the fourth aspect of the present invention, since the diameter of the inlet is larger than the inner diameter of the suction pipe, the oil flowing in from the inlet passes through the wide area of the filter evenly while reducing the speed. Therefore, it is possible to sufficiently exhibit the filtering function of the filter, and it is possible to prevent the filter from prematurely deteriorating due to the pressure of oil passing through the filter or local clogging.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic view of an engine 1 to which an oil strainer structure according to an embodiment of the present invention is applied.

  In the engine 1, an oil pump device 8 in which an oil pump drive mechanism 5 (see FIG. 2) is accommodated in a resin housing 7 is attached to a side portion of the engine body 3, and a bottom portion of the engine body 3. Is attached with an oil pan 11 for storing lubricating oil 9.

  As shown in FIG. 2, a plurality of boss portions 15 having bolt insertion holes 13 are integrally formed on the outer periphery of the housing 7, and by inserting bolts 17 into these bolt insertion holes 13, A housing 7 is attached to the engine body 3. An oil pump drive mechanism 5 is accommodated in the housing 7, and the oil pump drive mechanism 5 is rotated by an inner rotor 19 driven by a drive shaft 23 disposed inside the engine body 3 and the inner rotor 19. The outer rotor 21 is provided. In FIG. 2, reference numeral 25 denotes a suction passage formed on the inner surface of the housing 7 for sucking the oil 9 into the oil pump drive mechanism 5, and reference numeral 27 denotes a discharge passage formed on the inner surface of the housing 7 for pumping the oil 9 from the oil pump drive mechanism 5. A passage 29 is a discharge port that is provided at the downstream end of the delivery passage 27 and discharges the oil 9 to each part of the engine body 3.

  As shown in FIG. 3, a shallow first rectangular recessed portion 31 is formed in a substantially lower half region of the outer surface of the housing 7, and the first recessed portion 31 is located closer to the upper end (downstream side). An outflow port 33 communicating with the suction passage 25 is formed, and a first half 35 is formed at a position where the first recessed portion 31 is formed. In addition, a rectangular annular welding rib 37 is integrally projected from the open end edge of the first half 35 over the entire circumference. A rectangular resin second half 39 having a shallow depth is attached to the first half 35 so as to cover the first recess 31. The second half 39 is formed with a second recessed portion 41 that faces the first recessed portion 31. In addition, a rectangular annular groove 43 is formed on the open end edge of the second half 39 so as to correspond to the rib 37, and the groove 43 and the rib 37 are formed in the first half. The plate-like filter 45 made of resin is sandwiched between the half body 35 and the second half body 39, and are attached in an integrated liquid-tight state by hot plate welding. The first half 35 and the second half 39 form an oil flow path 47 so that the filter 45 divides the oil flow path 47 into an upstream flow path 47a and a downstream flow path 47b. The cross-sectional areas of the flow paths 47a and 47b are substantially equal. The cross-sectional area here is a cross-sectional area in a direction orthogonal to the oil flow direction.

  An annular projecting portion 39a is integrally projected outward from the lower side (upstream side) of the second half 39, and the inlet of the annular projecting portion 39a is formed by the internal space of the annular projecting portion 39a. 49 is configured. Further, a suction pipe 51 having an internal passage 53 for allowing the oil 9 from the oil pan 11 to flow into the oil flow path 47 is integrally connected to the annular projecting portion 39 a, whereby the internal passage 53 connects the inlet 49. And communicates with the upstream channel 47 a of the oil channel 47. The diameter D1 of the internal space (inlet 49) of the annular protrusion 39a is set larger than the inner diameter D2 of the suction pipe 51. Thus, the oil strainer main body 55 is constituted by the first half body 35 and the second half body 39, and the oil strainer 57 is constituted by the oil strainer main body 55, the suction pipe 51 and the filter 45.

  In the engine 1 configured as described above, the housing in which the oil 9 in the oil pan 11 is sucked up by the cooperation of the inner rotor 19 and the outer rotor 21 of the oil pump drive mechanism 5 and the oil pump drive mechanism 5 is accommodated. 7 is fed to each part of the engine main body 3 through an oil strainer 57 assembled integrally with the engine 7. That is, when the inner rotor 19 is rotationally driven by the drive shaft 23, the outer rotor 21 is rotated by transmitting the rotational torque to the outer rotor 21, and the volume between the inner rotor 19 and the outer rotor 21 is changed from the upstream side to the downstream side. The oil 9 gradually decreases, and the oil 9 is fed from the suction passage 25 to the delivery passage 27. As a result, the oil 9 in the oil pan 11 flows through the internal passage 53 in the suction pipe 51, flows from the inlet 49 to the upstream flow path 47 a of the oil flow path 47, passes through the filter 45, and is filtered. The

  In the present embodiment, since the diameter of the annular protrusion 39a of the second half 39 is larger than the inner diameter of the suction pipe 51, the oil 9 flowing from the suction pipe 51 spreads the entire filter 45 while reducing the speed. pass. Therefore, the entire filter 45 is effectively used, and early deterioration of the filter 45 can be suppressed.

  Further, in the present embodiment, the first half 35 is constituted by the formation portion of the first recessed portion 31 formed on the outer surface of the housing 7 of the oil pump device 8, and the second half is formed in the housing 7. The oil passage 47 is formed by attaching 39. Therefore, the attachment state of the attachment portion between the housing 7 and the second half 39 is more stable than when the oil strainer is attached in a state of being suspended from the engine case. Further, since the first half 35 is constituted by the housing 7, the weight of the oil strainer main body 55 can be reduced correspondingly, the weight of the entire engine 1 can be reduced, and the number of parts of the oil strainer main body 55 can be reduced. This can reduce the cost.

  In the present embodiment, since the first half 35 and the second half 39 are attached by welding, it does not take time to fasten with the bolts, and the first half 35 and the first half due to the loosening of the bolts. The oil 9 in the oil passage 47 does not flow out from the joint surface with the second half 39.

  Further, in the present embodiment, since the suction pipe 51 is provided in the oil strainer main body 55, the oil pan 11 can be changed from the oil pan 11 to the oil by placing the tip of the suction pipe 51 in the oil 9 in the oil pan 11. 9 can reliably flow into the oil flow path 47.

  Further, in the present embodiment, the housing 7 of the oil pump device 8 in which the oil strainer 57 is integrally assembled in advance can be assembled to the engine body 3 at the engine assembly factory, and the oil pump device and the oil strainer as in the conventional case. As compared with the case where the engine assembly factory is assembled to the engine body, the number of assembly steps at the engine assembly factory can be greatly reduced, so that the production efficiency can be remarkably improved.

  Thus, in this embodiment, since the oil strainer 57 and the housing 7 of the oil pump device 8 are modularized, the oil strainer main body is lightened, the number of parts is reduced, the manufacturing cost of the oil strainer is reduced, and the productivity is high. Excellent effects such as efficiency can be obtained.

  The rib 37 and the second half 39 of the first half 35 may be welded by high frequency welding or the like instead of hot plate welding. Moreover, you may attach by bolting instead of welding.

  Further, the second half 39 and the suction pipe 51 do not necessarily have to be integrally formed, but are formed as separate bodies so that they are connected to each other by a fastening member such as a bolt or screwing between ends. It may be.

  In the present embodiment, the second half 39 of the oil strainer body 55 and the housing 7 of the oil pump device 8 may be made of metal instead of resin, and the second half 39 is made of resin. The housing 7 may be made of metal.

  Further, the annular protrusion 39a formed on the second half 39 may be an annular protrusion having a rectangular or elliptical cross section.

  In addition, the oil pump drive mechanism 5 is not a mechanism in which the rotors 19 and 21 mesh with each other like the inner rotor 19 and the outer rotor 21, but is configured by other mechanisms such as a rotor with a vane constituting the oil pump drive mechanism 5. Also good.

  The present invention is useful, for example, when filtering circulating oil of an engine such as a vehicle.

1 is a schematic view of an engine to which an oil strainer structure according to an embodiment of the present invention is applied. It is a front view of the oil pump device which attached the oil strainer concerning the embodiment of the present invention. It is sectional drawing in the III-III line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Engine 3 Engine main body 5 Oil pump drive mechanism 7 Housing 8 Oil pump apparatus 9 Oil 11 Oil pan 25 Intake passage 31 1st recessed part 33 Outflow port 35 1st half body 39 2nd half body 39a Toroidal protrusion part 41 2nd Recess 45 Filter 47 Oil flow path 49 Inlet 51 Suction pipe 55 Oil strainer body 57 Oil strainer

Claims (4)

An oil pump drive mechanism that is driven by an engine includes an oil pump device housed in a housing, and an oil strainer disposed on the upstream side of the oil pump device. The oil pump device removes oil in an oil pan. When the oil is sucked up and fed to each part of the engine, the oil strainer structure allows the oil to pass through.
A first recessed portion having an outlet communicating with the suction passage of the oil pump device is formed on the outer surface of the housing, and covers a first half formed by the first recessed portion forming portion and the first recessed portion. The second half is attached to the first half as described above, has an inflow port through which oil from the oil pan flows, and is formed with a second recess facing the first recess. An oil strainer body with an oil passage formed inside is constructed,
An oil strainer structure for an engine, wherein a filter is disposed between the first half and the second half so as to divide the oil passage into two. The oil strainer structure for an engine according to claim 1,
An engine oil strainer structure characterized in that the first half and the second half are both made of resin and welded together. The oil strainer structure for an engine according to claim 1 or 2,
An oil strainer structure for an engine, wherein an inlet pipe for allowing oil from the oil pan to flow into an oil passage of the oil strainer body is connected to the inlet of the second half. The engine oil strainer structure according to claim 3,
The engine oil strainer is characterized in that the inlet of the second half is formed by an inner space of an annular projecting portion that has a diameter larger than the inner diameter of the suction pipe and projects from the second half. Construction.

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