JP2006242044A - Oil pump device for engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve assemblability of a gasket 19 without rupture of the gasket 19 in conversion of normal metal gasket 19 to one made of paper. <P>SOLUTION: In an oil pump device 17 for an engine 1 positioning an oil pump unit 15 on an engine main body 3 by two positioning pins 25 provided on the oil pump unit 15 and fastened by a bolt 29 via the gasket 19, the gasket 19 includes a positioning pin insertion hole 39, and a restriction part 39a restricting the gasket 19 on the positioning pin 25 is formed on an inner surface of the positioning pin insertion hole 39. The gasket 19 is made of paper composed of pulp material and binder, a direction connecting both holes 39 of the gasket 19 with the shortest distance crosses a fiber direction of the pulp at roughly right angles. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an improvement of an oil pump device for an engine.

The engine oil pump device is disposed on the front side (one end side in the crankshaft direction) of the engine body in order to make the engine compact. This oil pump device is fastened to a cylinder block of an engine via a sheet-like gasket for sealing a suction hole, a discharge hole, etc., and supplies oil to each lubricating part of the engine. The gasket is mainly made of metal. An example of such a metal gasket is described in Patent Document 1. According to this, the oil pump unit has a positioning pin, the gasket has a positioning pin insertion hole and an engaging member, the positioning pin insertion hole is fitted into the positioning pin, and the engaging member is further connected to the oil pump unit. The gasket prevents the gasket from dropping from the oil pump unit when the oil pump unit is attached to the engine body.
Japanese Patent Laid-Open No. 2003-227407 (page 4, FIG. 5)

  Incidentally, in recent years, there has been a demand for further cost reduction while maintaining engine functions and performance as well as improving engine productivity.

  Accordingly, the present inventor has studied to make a metal gasket made of paper. That is, since a paper gasket cannot be provided with an engaging member made of metal, a tight feeling is given between the positioning hole and the positioning pin so as not to be inadvertently removed. However, when the experiment was carried out in order to put the paper gasket into practical use, the problem that a crack occurred between the two positioning pin insertion holes and further the fracture occurred. As a result of analysis of this problem, the gasket attached tightly as described above is subjected to tensile stress due to repeated expansion and contraction of the oil pump unit accompanying the operation of the engine body, and oil leakage from the oil pump device is also caused. Therefore, it was found that the application of hydraulic pressure to the gasket also caused the tensile stress to act on the gasket. If the gasket breaks due to such a cause, a part of the gasket is further broken, and the cut end of the gasket is attached to the oil strainer in the oil pan to increase the suction resistance and supply oil to each lubricating part. There is a concern that it may prevent lubrication and cause poor lubrication.

  In order to eliminate the inconveniences described above, it is conceivable to seal the suction holes and the discharge holes with separate gaskets. The demand for productivity improvement cannot be met.

  Accordingly, the present invention has been made in view of the above points, and the object of the invention is to improve the assembling property without breaking the gasket, which is usually made of metal, when the gasket is made of paper. It is to let you.

  In order to achieve the above-mentioned purpose, further experiments and researches were conducted. As a result, the longitudinal direction of the fiber of the paper pulp material was strong but the degree of freedom of elongation was small, and conversely, the direction perpendicular to the fiber direction was free of elongation. It has been found that there is a close relationship between the fiber direction of this pulp material and the prevention of breakage of the gasket.

  Specifically, the present invention is directed to an engine oil pump device in which an oil pump unit is positioned on an engine body with two positioning pins provided on the oil pump unit and fastened with a bolt via a gasket. The following solutions were taken.

  That is, the invention according to claim 1 is characterized in that the gasket has holes that fit into the positioning pins, and an inner surface of the hole is formed with a restraining portion that restrains the gasket to the positioning pins. The gasket is made of paper made of a pulp material and a binder, and the direction in which the two holes of the gasket are connected to the shortest is substantially perpendicular to the fiber direction of the pulp material.

  According to this invention, since the gasket is made of paper, the cost can be reduced. Further, since the positioning pin insertion hole of the gasket forms a restraining portion on the inner surface, the gasket can be simply temporarily held on the oil pump unit to improve its assembling property. Then, since the direction connecting the two holes of the gasket to the shortest is substantially orthogonal to the fiber direction of the pulp material, compared to the case where the direction connecting the two holes to the shortest is the fiber longitudinal direction of the pulp material, Great freedom of elongation. Therefore, because the gasket is held in tension in the oil pump unit by the restraining portion, the oil pump unit is expanded and contracted as the engine is operated, and the gasket is pulled in the direction connecting the holes, and the relaxation is repeated. Since the degree of freedom of elongation in the direction is large as described above, the gasket can be prevented from being cracked and the breakage can be avoided.

  According to a second aspect of the present invention, in the first aspect of the invention, the oil pump unit has a suction hole and a discharge hole arranged along a line connecting the both positioning pins to the shortest, while the line A communication hole for introducing oil from the engine body side to the oil jet at a position away from the engine body and supplying the oil jet is provided, and the gasket is substantially V-shaped so as to cover the suction hole, the discharge hole and the communication hole. The formed seal part and the connecting part that connects the two divided parts of the seal part so as to form a hole on the crotch side of the seal part are integrally formed.

  According to this invention, since one gasket is formed so as to cover the suction hole, the discharge hole, and the communication hole, the complexity of the assembly can be reduced and the productivity can be improved. In addition, since the seal part formed in a substantially V shape and the connecting part that connects the two parts of the seal part are formed integrally, the gasket has a shape-retaining force and strength. It can be secured and is easy to handle. Further, when there is no hole on the crotch side of the seal portion formed in a substantially V shape so as to cover the suction hole, the discharge hole and the communication hole, the oil leaked from the oil pump unit is separated between the engine body and the gasket. In the meantime, unnecessary hydraulic pressure is applied to the gasket and causes breakage. However, since there is a hole on the crotch side of the seal portion, the leaked oil flows through the hole to the opposite side. For this reason, there is no imbalance in the pressure applied to the gasket, the tensile action does not reach the gasket, and it is possible to prevent the gasket from cracking.

  According to a third aspect of the invention, in the invention of the second aspect, the hole formed on the crotch side of the seal portion is circular.

  If there is a portion with a small curvature radius on a part of the inner surface of the hole, the load concentrates on the hole and easily breaks. However, according to the present invention, the hole is circular, thus avoiding concentration of the load. can do.

  The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the engine body is made of light metal.

  According to this invention, since the engine body is made of light metal, the effect of claim 1 can be sufficiently exerted even if the amount of thermal expansion of the engine body is large.

  According to the first aspect of the present invention, the restraint portion is provided in the positioning pin insertion hole of the paper gasket, and the fiber direction is substantially orthogonal to the direction connecting the two positioning pin insertion holes, thereby reducing cost and improving assemblability. In addition, the gasket can be prevented from being broken regardless of repeated expansion and contraction of the oil pump unit accompanying the operation of the engine.

  According to the invention of claim 2, since one gasket is formed so as to cover the suction hole, the discharge hole, and the communication hole, the complexity of the assembly is reduced and the productivity is improved. Can do. Further, there is a connecting portion that connects the two divided portions of the seal portion so that a hole is formed on the crotch side of the seal portion formed in a substantially V shape so as to cover the suction hole, the discharge hole, and the communication hole. Since it is formed integrally, it is advantageous for securing the strength of the gasket and also for preventing the gasket from being broken by hydraulic pressure.

  According to the third aspect of the present invention, since the hole formed on the crotch side of the substantially V-shaped seal portion is circular, it is possible to avoid a load from being concentrated on a part of the hole, thereby preventing breakage. The effect can be further enhanced.

  According to the invention of claim 4, since the engine body is made of light metal, the effect of claim 1 can be sufficiently exerted even if the engine body has a large amount of thermal expansion.

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

(Embodiment 1)
FIG. 1 is a front view showing a main body 3 of the engine 1. The engine body 3 is made of a light alloy. The rotation of the crankshaft 5 rotated by a piston (not shown) is taken out by a crank sprocket 6 and a cam sprocket 9 is driven by a timing chain 7. A chain guide 11 is provided on the side of the timing chain 7. A metal oil pump unit 15 is attached to the cylinder block 13 of the engine body 3, and the crankshaft 5 rotates and a part of the power rotates the oil pump unit 15, thereby causing an oil pan (not shown). ) Is sucked up and replenished and circulated in the rotating part and sliding part of the engine 1.

  FIG. 2 is a front view showing the oil pump device 17 according to Embodiment 1 of the present invention. The oil pump device 17 is provided by attaching the oil pump unit 15 to the cylinder block 13 via a substantially V-shaped gasket 19 indicated by a broken line. FIG. 3 is a perspective view showing the attached state, and FIG. 4 is a view of the oil pump unit 15 as seen from the bottom.

  As shown in FIGS. 2 and 3, the oil pump unit 15 is provided with a hole 21 for assembling the oil pump unit 15 to the crankshaft 5. The relief valve 23 provided in the oil pump unit 15 is for making the hydraulic pressure constant.

  Two positioning pins 25 are provided at the lower part on the back side of the oil pump unit 15 so as to protrude from the left and right to the cylinder block 13 (see FIG. 4). The oil pump unit 15 is provided with six bolt insertion holes 27 for fastening the oil pump unit 15 to the cylinder block 13 with bolts 29.

  A suction port 31 and a discharge port 33 are provided in the lower part on the back side of the oil pump unit 15. The suction port 31 is for sucking oil into the oil pump unit 15, and the discharge port 33 is an oil pump. The oil is supplied from the unit 15 to each lubricating part of the engine 1. An oil jet 35 is provided at the upper part of the oil pump unit 15, and a part of the oil from the oil supply passage on the engine body 3 side passes through the oil jet communication hole 37 to the oil pump unit 15 side. It is introduced and supplied to the oil jet 35 through a passage formed in the oil pump unit 15. The oil jet 35 injects oil to the timing chain 7.

  The suction hole 31 and the discharge hole 33 are disposed along a line connecting the positioning pins to the shortest, and the oil jet communication hole 37 is provided at a position away from the line.

  FIG. 5 is a front view showing the gasket 19 according to Embodiment 1 of the present invention. The gasket 19 is made of paper made of a pulp material and a binder. Therefore, it can be made cheaper and lighter than ordinary metal.

  The gasket 19 is integrally formed with a seal portion formed in a substantially V shape and a connecting portion 19a that connects the two split portions of the seal portion. A hydraulic release hole 47 for releasing the hydraulic pressure is formed. The substantially V-shaped seal portion is formed by connecting a first belt-shaped portion and a second belt-shaped portion in a substantially V-shape, and a corner portion of the V-shape (the first belt-shaped portion and the second belt-shaped portion). Is provided with a gasket discharge hole 43 corresponding to the discharge hole 33 provided in the oil pump unit 15, and in the vicinity thereof corresponds to the bolt insertion hole 27 provided in the oil pump unit 15. Bolt insertion holes 49 on the gasket side and positioning pin insertion holes 39 that fit into the positioning pins 25 provided in the oil pump unit 15 are provided. Thus, another positioning pin insertion hole 39 is provided at the tip of the first band-shaped portion extending from the V-shaped corner (intersection of the first band-shaped portion and the second band-shaped portion), and in the vicinity thereof. A gasket suction hole 41 and a bolt insertion hole 49 are provided, and the gasket suction hole 41 and the gasket discharge hole 43 are arranged along a line connecting the both positioning pin insertion holes 39 in the shortest distance. The two positioning pin insertion holes 39 also serve as gasket insertion bolt insertion holes. On the other hand, in the second belt-shaped portion extending from the V-shaped corner (intersection of the first belt-shaped portion and the second belt-shaped portion) to the opposite side, the positioning pin insertion hole 39 is at a position away from the line connecting the shortest. An oil jet communication hole 45 on the gasket side is provided, and the oil jet communication hole 45 on the gasket side introduces oil from the engine body 3 side and supplies it to the oil jet 35. Bolt insertion holes 49 are provided on both sides of the oil jet communication hole 45 on the gasket side.

  In this way, the integral gasket 19 has the gasket suction hole 41, the gasket discharge hole 43, and the oil jet communication hole 45 on the gasket side. It is not necessary to seal at 19, and the assembling work can be simplified. Further, since the seal portion formed in a substantially V shape and the connecting portion 19a that connects the two divided portions are integrally formed, the strength of the gasket 19 can be ensured. Further, since the hydraulic release hole 47 is formed on the crotch side of the seal portion, the oil leaked from the oil pump unit 15 passes through the hydraulic release hole 47 from the gap between the engine body 3 and the gasket 19 to the opposite side. Exit. Therefore, an imbalance is not generated in the pressure applied to the gasket 19, and the tensile action does not reach the gasket 19. This suppresses the occurrence of cracks in the gasket 19 and prevents breakage.

  A restraining portion 39 a for restraining the gasket 19 to the positioning pin 25 is formed on the inner surface of the positioning pin insertion hole 39 provided in the gasket 19. That is, the positioning pin 25 has a circular cross section, but the positioning pin insertion hole 39 is formed with a portion where the inner diameter as the restraining portion 39a is smaller than the outer diameter of the positioning pin 25, and the restraining portion 39a forms the gasket 19. Is held in tension in the oil pump unit 15.

  As described above, since the positioning pin insertion hole 39 has the restraining portion 39a, the gasket 19 is inadvertently attached when the gasket 19 is attached to the oil pump unit 15 and the oil pump unit 15 is attached to the engine body 3. It can be prevented from falling off. Further, the restraining portion 39a can easily exhibit the temporary holding function without providing a special member.

Next, in the gasket 19 made of paper, the direction in which the positioning pin insertion holes 39 are shortest is substantially perpendicular to the fiber direction of the pulp material. That is, since the longitudinal direction of the roll-shaped paper for punching and forming the gasket 19 is the same as the longitudinal direction of the fiber of the paper, the direction in which the two positioning pin insertion holes 39 of the gasket 19 are connected to the shortest and the roll-shaped paper The fiber longitudinal direction is substantially orthogonal.

  Since the gasket 19 is tightly fitted to the oil pump unit 15 to prevent the drop off, the two positionings provided on the gasket 19 are repeated by repeated expansion and contraction of the oil pump unit 15 accompanying the operation of the engine body 3. Although tensile stress is applied between the pin insertion holes 39, the direction in which the two positioning pin insertion holes 39 are connected to each other and the fiber direction of the pulp material of the gasket 19 are substantially orthogonal to each other. The degree is great. Therefore, the gasket 19 is prevented from being cracked, and the breakage can be avoided.

  As described above, according to the present invention, since the gasket 19 is made of paper, the cost can be reduced. Further, since the restraining portion 39a is formed on the inner surface of the positioning pin insertion hole 39 of the gasket 19, the gasket 19 can be simply temporarily held on the oil pump unit 15 to improve its assemblability. Further, since the gasket 19 is tightly attached to the oil pump unit 15, the tensile stress accompanying the repeated expansion and contraction of the oil pump unit 15 accompanying the operation of the engine body 3 is two positionings provided on the gasket 19. Although it takes between the pin insertion holes 39, the direction in which the two holes 39 of the gasket 19 are connected to the shortest is substantially perpendicular to the fiber direction of the pulp material. Can be prevented and breakage can be avoided.

  Further, since the single gasket 19 is formed so as to cover the suction hole 31, the discharge hole 33, and the communication hole 37, the complexity of the assembly can be reduced and the productivity can be improved. Further, since the hydraulic release hole 47 is formed on the crotch side of the substantially V-shaped seal portion, the oil leaked from the oil pump unit 15 is supplied from the gap between the engine body 3 and the gasket 19 to the hydraulic release hole. 47, the pressure applied to the gasket 19 is not imbalanced, and the tensile action does not reach the gasket 19. Therefore, it is possible to prevent the gasket 19 from cracking.

  In this way, by preventing the gasket 19 from being broken, a part of the gasket 19 is torn off, and the cut end of the gasket 19 sucks and adheres to the oil strainer in the oil pan, increasing the suction resistance, and supplying oil to each lubricating part. It is possible to prevent the occurrence of poor lubrication.

(Embodiment 2)
FIG. 6 is a front view showing a gasket 19 according to the second embodiment. The second embodiment is the same as the first embodiment except that the hydraulic pressure release hole 47 formed on the crotch side of the substantially V-shaped seal portion of the gasket 19 in the first embodiment is circular. Therefore, the description of the overall configuration of the oil pump device 17 of the engine 1 is omitted.

  That is, since the hydraulic release hole 47 formed on the crotch side of the seal portion is circular, there is no portion having a small radius of curvature in a part of the inner surface of the hole, so that the load is concentrated on a part of the hydraulic release hole 47. Thus, the effect of preventing breakage can be further enhanced.

  The present invention is useful for an oil pump device for an engine.

It is a front view which shows an engine main body. 1 is a front view showing an oil pump device according to Embodiment 1. FIG. It is a perspective view which shows the state which attaches the oil pump unit which concerns on Embodiment 1 to a cylinder block via a gasket. It is a bottom view of an oil pump unit. 2 is a front view showing a gasket according to Embodiment 1. FIG. 6 is a front view showing a gasket according to Embodiment 2. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Engine 3 Engine main body 13 Cylinder block 15 Oil pump unit 17 Oil pump apparatus 19 Gasket 19a Connecting part 25 Positioning pin 27 Bolt insertion hole 29 Bolt 31 Suction hole 33 Discharge hole 37 Oil jet communication hole 39 Positioning pin insertion hole 39a Restriction part 41 Gasket suction hole 43 Gasket discharge hole 45 Oil jet communication hole on gasket side 47 Hydraulic release hole 49 Bolt insertion hole on gasket side

Claims (4)

In an engine oil pump device in which an oil pump unit is positioned on an engine body with two positioning pins provided on the oil pump unit and fastened with a bolt via a gasket.
The gasket has holes that fit into the positioning pins, and a restraining portion that restrains the gasket to the positioning pins is formed on the inner surface of the holes.
An oil pump device for an engine, wherein the gasket is made of paper made of a pulp material and a binder, and the direction connecting the two holes of the gasket to the shortest is substantially orthogonal to the fiber direction of the pulp material. In the invention of claim 1,
The oil pump unit has a suction hole and a discharge hole arranged along a line connecting the both positioning pins to the shortest distance, and introduces oil from the engine body side to a position away from the line so that the oil jet A communication hole for supplying,
The gasket has a seal part formed in a substantially V shape so as to cover the suction hole, the discharge hole and the communication hole, and a part divided into two parts of the seal part so that a hole is formed on the crotch side of the seal part An oil pump device for an engine, characterized in that a connecting portion that connects each other is integrally formed. In the invention of claim 2,
An oil pump device for an engine, wherein the hole formed on the crotch side of the seal portion is circular. In the invention according to any one of claims 1 to 3,
An engine oil pump device characterized in that the engine body is made of light metal.

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