JP2021105364A - engine - Google Patents

Abstract

To provide an engine more improved by devising the structure of a baffle plate including an oil strainer so as to have no disadvantage in relation to the baffle plate or be alleviated in the disadvantage that oil drainage performance due to a large opening is deteriorated or the baffle plate easily resonates.SOLUTION: In an engine, an oil pan 4 is mounted below a crankcase 1A, and a baffle plate 12 covering the oil pan 4 from above is provided. An oil strainer A made of a pipe material vertically penetrating the baffle plate 12 is provided. An oil outlet 14 of the oil strainer A is located above the baffle plate 12, and an oil suction port 13 of the oil strainer A is located below the baffle plate 12. The oil strainer A and the baffle plate 12 are fixed to each other and are composed in one component.SELECTED DRAWING: Figure 5

Description

The present invention relates to an engine in which an oil pan is attached below the crankcase and a baffle plate is provided to cover the oil pan from above.

In an engine equipped with a baffle plate, the rippling of the engine oil stored in the oil pan is suppressed by the baffle plate, which causes output loss due to excessive stirring of the engine oil by the crank shaft, oil temperature rise, and blow-by gas. There is an advantage that the increase of oil mist is suppressed.

In a conventional engine, as disclosed in Patent Document 1, an oil strainer (not marked) is provided so as to extend downward from the lower part of the crankcase so that the oil suction port is located near the bottom of the oil pan. There is. The baffle plate (3) was formed with a large opening (center side oil return opening: 3d) for allowing the passage of the oil strainer, in addition to a large number of outer peripheral side oil return openings (3b).

By providing the large opening, the oil can be smoothly transferred between the upper and lower parts of the baffle plate, and the baffle plate can be attached and detached without removing the oil strainer.
However, the presence of the large opening has the disadvantages that the oil drainage performance is lowered and the baffle plate is likely to resonate.

Japanese Unexamined Patent Publication No. 2015-175347

An object of the present invention is to improve the engine so that the structure of the baffle plate including the oil strainer does not have or reduces the disadvantage of the baffle plate such as deterioration of oil drainage performance due to a large opening and easy resonance. Is in the point of providing.

The present invention relates to an engine in which an oil pan is attached below the crankcase and a baffle plate is provided to cover the oil pan from above.
An oil strainer made of a pipe material that penetrates the baffle plate up and down is provided.
The oil outlet of the oil strainer is located above the baffle plate, and the oil suction port of the oil strainer is located below the baffle plate.
The oil strainer and the baffle plate are fixed to each other to form one component.

Regarding the present invention, refer to claims 2 to 6 for feature configurations and means other than the above-mentioned configurations (means).

According to the present invention, the baffle plate and the oil strainer penetrating the baffle plate up and down are fixed to each other to form one component. Therefore, since it is not necessary to provide the baffle plate with a large opening for passing the oil strainer, it is sufficient to provide a targeted and appropriately sized opening for passing oil. Therefore, it is possible to prevent or suppress the "deterioration of oil drainage performance" due to the large opening and the tendency of the baffle plate to resonate.

As a result, by devising the structure of the baffle plate including the oil strainer, it is possible to provide a more improved engine so that the oil drainage performance due to the large opening is reduced or the baffle plate is likely to resonate without any disadvantage. be able to.

Front view of spark ignition engine Rear view of the engine shown in FIG. Top view of the engine shown in FIG. Right side view of the engine shown in FIG. Side view of filter (baffle plate and oil strainer) Top view of the filter shown in FIG. ZZ line sectional view of FIG. 5 showing a main part of the filter. Side view of the main part of the filter assembled to the crankcase

Hereinafter, embodiments of the engine according to the present invention will be described with reference to the drawings in the case of an industrial spark ignition engine (gasoline engine, etc.) used for agricultural machinery, construction machinery, generators, working machines, and the like.

As shown in FIGS. 1 to 4, the engine E has a cylinder block 1, a cylinder head 2 assembled on the cylinder block, and a head cover 3 assembled on the cylinder head 2. .. The cylinder block 1 has a crankcase 1A to which the oil pan 4 is mounted below, and a cylinder 1B in which a piston (not shown) is housed. A front cover (transmission case) 37 is assembled on the front side of the cylinder block 1.

The front part of the engine E is equipped with a transmission belt 5, an engine cooling fan 6, a water flange 7, and the like, and the rear part of the engine E is equipped with a flywheel housing 8. An exhaust manifold 9 and an exhaust cover 10 covering the exhaust manifold 9 are mounted on the upper left side of the engine E, and an intake manifold 11 and the like are mounted on the upper right side of the engine E.

As shown in FIGS. 1 to 4, the intake manifold 11 includes an intake main body 11A and four branch pipe portions 11a. Reference numeral 34 is an intake flange, 35 is a throttle, and 36 is an injector mounted on each branch pipe portion 11a. The engine E is configured to have dual fuel specifications.

The fresh air introduction passage 28 made of a tube or pipe material is in a state in which the inside of each of the right side of the front end portion of the cylinder head 2 (the side where the intake manifold 11 is arranged) and the inside of the intake flange 34 are communicated with each other. It is erected in. By providing the fresh air introduction passage 28, the ventilation device D is configured to take in fresh air (fresh air) from an air cleaner (not shown) into the engine. The return hose 29 is connected to the intake manifold 11 so as to communicate with the inside of the intake main body (blow-by gas return point) 11A.

As shown in FIGS. 1 to 4, the head cover 3 includes a main cover portion 3A for covering the valve operating mechanism and a flange portion 3B for supporting the ignition coil integrated plug cap 18, and the head cover gasket (not shown). It is mounted on the cylinder head 2 via a bolt and fixed by bolting.

The main cover portion 3A is provided with an oil cap 20 for an engine oil supply port (not shown) and a gas outlet 21 which is a blow-by gas outlet portion, and a state in which the height is slightly lower than the top wall 3a. It is provided with an upper wall 3b formed on the side of the flange portion 3B of the top wall 3a. A PCV valve 27, which is an example of a pressure regulating valve, is housed in the gas outlet 21, and a reflux hose 29 is connected to the PCV valve 27 and the intake manifold 11.

Next, a baffle plate and the like will be described. As shown in FIGS. 1 and 4, the baffle plate 12 is provided at the lower end of the crankcase 1A (or the upper end of the oil pan 4). That is, the engine E is provided with an oil pan 4 attached below the crankcase 1A and a baffle plate 12 covering the oil pan 4 from above.

As shown in FIGS. 5 to 8, an oil strainer A made of a pipe material that penetrates the baffle plate 12 vertically is provided, and the oil outlet 14 of the oil strainer A is above the baffle plate 12 and the oil strainer A. The oil suction port (strainer portion) 13 of the above is located below the baffle plate 12, respectively. The oil strainer A and the baffle plate 12 are fixed to each other and are configured as one component, that is, a filter (oil filter) B.

As shown in FIGS. 5 to 7, the baffle plate 12 is a rolled steel plate having a slightly long rectangular shape in the front-rear direction in a plan view, and large holes 19 for oil gauges are formed on the right side and the rear side in the center of the front-rear direction. At the same time, one inner hole 19A, a plurality of (six) small holes 23, and one second small hole 23A are formed. An elongated hole (elliptical hole) 24 for supporting the oil strainer A in a state of being vertically penetrated is formed in the front left portion of the baffle plate 12.

Brackets 17 that are vertically cut down by the cutting process are formed at locations located at the front, rear, left, and right centers of the baffle plate 12. Reference numeral 17A (see FIG. 6) is an opening formed by cutting and raising the bracket 17. As shown small at the break line in FIGS. 1 and 4, the baffle plate 12 is attached by means of attaching (not shown) such as bolting to the lower end surface of the crankcase 1A using the small holes 23. It is arranged near the upper and lower boundary between the crankcase 1A and the oil pan 4.

As shown in FIGS. 5 to 7, the oil strainer A is composed of a steel pipe material (pipe material) having a cylindrical cross section formed by being bent three-dimensionally, and the oil outlet 14 and the through pipe portion (baffle plate) are sequentially formed from the front. It is provided with an intermediate pipe portion 25 including a portion (a portion penetrated through 12) 15 and a supported pipe portion (a portion on the oil suction port side) 16 and an oil suction port 13.

The oil outlet 14 has an axial center p along the spreading direction (front-back direction) Y of the plate surface 12a of the baffle plate 12, and the tip portion (front end portion) thereof is slightly enlarged in diameter and precision machined. The fitting pipe portion 14A is formed. The fitting pipe portion 14A is formed with an outer peripheral groove 14a through which a sealing material such as an O-ring can be wound.

The oil suction port 13 is configured by opening a large number of pores (filtration portions) 22 in the oil outlet side portion of the crushed portion 30 which is a flatly crushed pipe end. As the pipe material for forming the oil suction port 13, a pipe material slightly thicker than the other parts may be used. Further, the oil suction port 13 is provided with an inclined axis q that is slightly upwardly inclined.

There is an intermediate pipe portion 25 between the oil outlet 14 and the oil suction port 13, and the through pipe portion 15 on the front side thereof has an axial center x in the diagonal direction intersecting with the spreading direction Y, and is a baffle. It penetrates through the elongated hole 24 of the plate 12. The supported pipe portion 16 located on the front side of the oil suction port 13 is supported by welding to the lower end portion of the bracket 17, which has a trapezoidal shape and is narrowed downward in the front-rear direction.

As shown in FIG. 6, in the intermediate pipe portion 25, the axial center p of the oil outlet 14 and the inclined axial center q of the oil suction port 13 are parallel (substantially parallel or not necessarily parallel) to each other in the vertical view. ), And the portion is bent three-dimensionally in front, back, left, right, up and down so that the oil outlet 14 is located closer to the left side with respect to the oil suction port 13.

As shown in FIGS. 5 and 8, the oil outlet 14 having an axial center p along the spreading direction of the plate surface of the baffle plate 12 passes through the through hole 1a of the front wall 1f of the crankcase 1A and exits forward. It is fitted inside the oil receiving hole 37a of the front cover 37. The oil receiving hole 37a has a horizontal axis y facing forward and backward, and is communicated with a suction port (or an oil passage on the suction side) 38 of an oil pump (not shown) on the front side thereof. That is, the spreading direction Y of the plate surface 12a, the axial center p of the oil outlet 14, and the horizontal axial center y of the oil receiving hole 37a are set to be parallel to each other.

Therefore, as shown in FIG. 5, for example, with the baffle plate 12 applied to the lower surface (notation omitted) of the rear wall 1r of the crankcase 1A, the filter B is moved forward as shown by the white arrow. If the oil outlet 14 is slid to, the oil outlet 14 is fitted into the oil receiving hole 37a through the through hole 1a and can be set at the regular assembly position. Depending on the dimensions of each part, the plate surface 12a may not be applied to the rear wall 1r, and the mounting surface of the crankcase 1A (see FIG. 8: the lower surface of the hanging wall to which the baffle plate 12 is bolted and not marked). It is possible to slide the filter B against the filter B.

[About action and effect]
Since the baffle plate 12 and the oil strainer A that penetrates the baffle plate 12 are fixed to each other and are configured as one component (filter B), it is necessary to provide the baffle plate 12 with a large opening for passing the oil strainer A. There is no. Therefore, it is possible to prevent or suppress the "deterioration of oil drainage performance" due to the large opening and the tendency of the baffle plate to resonate. In addition, it becomes possible to reduce variable costs.

Since the spreading direction Y of the plate surface 12a, the axial center p of the oil outlet 14, and the horizontal axial center y of the oil receiving hole 37a are parallel to each other, the baffle plate 12 is laterally placed at the lower end of the crankcase 1A. The filter B can be set at an assembly compatible position where the oil outlet 14 is fitted in the oil receiving hole 37a by a simple one-action operation of simply sliding in the direction.

Since the axial center x of the through pipe portion 15 of the oil strainer A intersects the spreading direction Y of the plate surface of the baffle plate 12, the elongated hole 24 can be made into a hole having as small an area as possible. The oil strainer A is fixedly supported on the baffle plate 12 in a well-balanced manner at two locations, a through pipe portion 15 and a supported pipe portion 16.

Since the bracket 17 that supports the supported pipe portion 16 is formed by cutting and raising a part of the baffle plate 12, a dedicated bracket for supporting the oil strainer, which has been required in the past, is no longer necessary, and the number of parts is increased. A low-priced and rational support structure has been realized without an increase in the number of strainers. Further, it is also preferable that the opening 17A formed by cutting and raising can function as an opening having an appropriate area as a moving portion of the engine oil baffle plate 12 up and down.

[Another Embodiment]
The oil suction port (strainer portion) 13 may have a larger filtration portion. The bracket 17 may be made of a separate member attached to the baffle plate 12 by bolting or welding.

1A Crankcase 4 Oil pan 12 Baffle plate 13 Oil suction port 14 Oil outlet 15 Penetration part 16 Oil suction port side part 17 Bracket 22 Small hole 37 Front cover 37a Oil receiving hole A Oil strainer p Axis center x Crossing direction Axis

Claims (6)

An engine in which an oil pan is attached below the crankcase and a baffle plate is provided to cover the oil pan from above.
An oil strainer made of a pipe material that penetrates the baffle plate up and down is provided.
The oil outlet of the oil strainer is located above the baffle plate, and the oil suction port of the oil strainer is located below the baffle plate.
An engine in which the oil strainer and the baffle plate are fixed to each other to form one component. An oil receiving hole is formed in the front cover or the crankcase into which the oil outlet is internally fitted.
The engine according to claim 1, wherein the oil outlet has an axial center along the spreading direction Y of the plate surface of the baffle plate. The engine according to claim 1 or 2, wherein the portion of the oil strainer penetrating the baffle plate has an axial center in a direction intersecting the spreading direction of the plate surface of the baffle plate. The portion of the oil strainer that penetrates the baffle plate is fixed to the baffle plate.
The engine according to any one of claims 1 to 3, wherein a bracket for supporting a portion of the oil strainer on the oil suction port side is provided on the baffle plate. The engine according to claim 4, wherein the bracket is formed by cutting up a part of the baffle plate. The engine according to any one of claims 1 to 5, wherein the oil suction port is formed by opening a large number of pores in an oil outlet side portion of a flatly crushed pipe end.

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