JP2021161909A - Oil retaining structure - Google Patents

Abstract

To retain a lubrication oil leaking to the outside effectively.SOLUTION: An oil retaining structure 50 retains a lubrication oil leaking from an insertion hole 43 to an outer wall part 42 in the outer wall part 42 having the insertion hole 43 into which a shaft member 30 penetrating through a device body part 11 is inserted. An oil retaining member 51 capable of absorbing or adsorbing the lubrication oil is provided at a portion, which is located below the insertion hole 43, of the outer wall part 42.SELECTED DRAWING: Figure 2

Description

The present disclosure relates to an oil retention structure, and more particularly to a technique suitable for preventing leakage of lubricating oil from a flywheel housing.

For example, Patent Document 1 describes a crankshaft between the engine block and the crankshaft in order to prevent lubricating oil from leaking to the outside through a gap between the outer wall portion of the engine block and the outer peripheral surface of the crankshaft. A structure provided with a sealing member (crank oil seal) that is in sliding contact with the outer peripheral surface of the vehicle is disclosed.

JP-A-2017-180555

The sealing member may be immersed in the lubricating oil that infiltrates from the crank chamber side and is submerged depending on the degree of inclination of the engine and the oil level of the lubricating oil stored in the oil pan. When the sealing member is submerged in oil, lubricating oil may enter the flywheel housing from the engine body and leak to the outside from the mating surfaces of the flywheel housing or the like.

The technique of the present disclosure has been made in view of the above circumstances, and an object of the present invention is to provide an oil-retaining structure capable of effectively retaining lubricating oil leaking to the outside.

The technique of the present disclosure is an oil-retaining structure for holding lubricating oil leaking from the insertion hole to the outer wall portion in an outer wall portion having an insertion hole through which a shaft component penetrating the apparatus main body portion is inserted. It is characterized in that an oil-retaining member capable of absorbing or adsorbing the lubricating oil is provided at a portion below the insertion hole.

Further, the device main body may be an engine main body, and the shaft component may be a crankshaft penetrating the engine main body.

Further, the outer wall portion may be a housing wall portion fixed to the engine main body portion of the flywheel housing accommodating the flywheel attached to one end portion of the crankshaft.

Further, the outer wall portion projects from a portion below the insertion hole toward the device main body portion and is further provided with a plurality of ribs facing each other, and the oil retaining member is a space facing the plurality of ribs. It is preferable that it is provided in.

Further, it is preferable that the outer wall portion is further provided with a recess that is recessed from a portion below the insertion hole toward the device main body portion, and the oil retaining member is provided inside the recess.

Further, it is preferable that the oil-retaining member is formed of a mesh-shaped metal member or a porous resin member.

According to the technique of the present disclosure, the lubricating oil leaking to the outside can be effectively retained.

It is a schematic partial cross-sectional view of the mechanical apparatus (engine) which concerns on this embodiment. It is a schematic perspective view which shows the oil-retaining structure which concerns on 1st Embodiment. It is a schematic perspective view which shows the oil-retaining structure which concerns on 2nd Embodiment. It is a schematic cross-sectional view which shows the oil-retaining structure which concerns on 3rd Embodiment.

Hereinafter, the oil retention structure according to the present embodiment will be described with reference to the attached drawings. The same parts have the same reference numerals, and their names and functions are also the same. Therefore, detailed explanations about them will not be repeated.

[overall structure]
FIG. 1 is a schematic partial cross-sectional view of an engine 10 which is an example of a mechanical device according to the present embodiment.

As shown in FIG. 1, the engine 10 is, for example, an in-line 4-cylinder engine, and is an engine main body including a head cover 12, a cylinder head 13, a cylinder block 14, a crankcase 16, an oil pan 19, and the like in this order from the upper side. (Device main body) 11 is provided. The engine 10 is not limited to the in-line 4-cylinder engine shown in the illustrated example, and may be an in-line multi-cylinder engine other than the 4-cylinder engine, a V-type multi-cylinder engine, a horizontally opposed multi-cylinder engine, or a single-cylinder engine.

The cylinder head 13 is provided with injectors J1 to J4 for directly injecting fuel into the combustion chamber. Further, the cylinder head 13 is provided with an intake port (not shown) for introducing fresh air into the combustion chamber and an exhaust port (not shown) for drawing exhaust gas from the combustion chamber. The engine 10 is not limited to the direct injection engine shown in the illustrated example, and may be a premixed engine.

The cylinder block 14 includes a plurality of cylinders C1 to C4 partitioned by a partition wall 15. Further, pistons P1 to P4 are housed in the cylinders C1 to C4 so as to be reciprocating. A small end portion of the connecting rod 22 is swingably connected to the pistons P1 to P4 via a piston pin 21. The combustion chamber is partitioned by the top surfaces of the pistons P1 to P4, the inner peripheral surfaces of the cylinders C1 to C4, and the lower surface of the cylinder head 13.

The crankcase 16 is fastened and fixed to the lower part of the cylinder block 14 with bolts or the like (not shown). Specifically, the crankcase 16 includes a rudder frame 17 extending in the axial direction of the crankshaft (shaft component) 30, and a bearing cap 18 provided on the upper portion of the rudder frame 17 corresponding to each wall portion 15. I have. The bearing cap 18 and each partition wall 15 are each formed with recesses recessed in a semicircular shape, and the bearing 2 (for example, a half-split plain bearing) is attached to a circular bearing hole in which both recesses are butted against each other. As a result, the crankshaft 30 is rotatably supported around the axis.

More specifically, the crankshaft 30 includes a plurality of crankpins 31 in which the large ends of the connecting rods 22 are swingably connected via bearings 3 (for example, half-split bearings), and a partition wall 15 and bearings. A journal portion 32 rotatably supported by a bearing 2 between the cap 18 and a plurality of crank webs 33 connecting each crank pin 31 and each journal portion 32, and a crankshaft with respect to the crank web 33. It is provided with a plurality of counter weights 34 facing each other with the rotation axis of 30 interposed therebetween.

When the pistons P1 to P4 reciprocate in the cylinders C1 to C4 due to the explosive force in the combustion chamber, this reciprocating motion is transmitted from the connecting rod 22 to the crank pin 31 and converted into a rotary motion, and the crankshaft 30 moves the journal portion 32. It is designed to rotate around the axis.

In the following description, the portion forming the front wall of the cylinder block 14 is referred to as the block front wall portion 14A, and the portion constituting the rear wall of the cylinder block 14 is referred to as the block rear wall portion 14B. The portion constituting the front wall of the crankcase 16 is referred to as a case front wall portion 16A, and the portion constituting the rear wall of the crankcase 16 is referred to as a case rear wall portion 16B.

Of the journal portions 32, the journal portion 32 supported by the bearing hole between the block front wall portion 14A and the case front wall portion 16A has the front end of the crankshaft 30 projecting toward the front side of the engine body portion 11. A section 35 is provided. The front end portion 35 is provided with a crank pulley (not shown) that transmits power to auxiliary machinery and the like. Further, in the bearing hole between the block front wall portion 14A and the case front wall portion 16A, an annular front sealing member 27 for sealing the gap with the journal portion 32 is provided.

Of the journal portions 32, the journal portion 32 supported by the bearing hole between the block rear wall portion 14B and the case rear wall portion 16B has a crankshaft 30 that projects toward the rear side of the engine body portion 11. A rear end portion 36 is provided. Further, in the bearing hole between the block rear wall portion 14B and the case rear wall portion 16B, an annular rear sealing member 29 for sealing the gap with the journal portion 32 is provided.

A flywheel 37 is provided on the rear end portion 36 of the crankshaft 30 so as to be integrally rotatable. The flywheel 37 functions as a part of a clutch device that transmits the rotational force of the crankshaft 30 to a transmission or the like (not shown) while stabilizing the rotation of the crankshaft 30 by an inertial force. The flywheel 37 is housed in a flywheel housing 40 fixed to the engine body 11.

The flywheel housing 40 is formed in a substantially bottomed tubular shape, and has a substantially cylindrical housing peripheral wall portion 41 that surrounds the outer periphery of the flywheel 37 and a substantially circular housing front wall that closes one end opening of the housing peripheral wall portion 41. A portion 42 (an example of an outer wall portion and a housing wall portion of the present disclosure) is provided. The housing front wall portion 42 is fixed to the block rear wall portion 14B and the case rear wall portion 16B of the engine main body 11 with bolts or the like. An insertion hole 43 through which the rear end portion 36 of the crankshaft 30 is inserted is formed through the substantially circular center portion of the housing front wall portion 42.

In the present embodiment, below the insertion hole 43 of the housing front wall portion 42 in the vertical direction, the flywheel housing passes through the bearing hole between the block rear wall portion 14B and the case rear wall portion 16B from the insertion hole 43. An oil-retaining structure 50 is provided to hold the lubricating oil that penetrates into the 40. Hereinafter, the details of the oil retention structure 50 will be described.

[First Embodiment]
FIG. 2 is a schematic perspective view showing the oil retention structure 50 according to the first embodiment.

As shown in FIG. 2, the oil retention structure 50 of the first embodiment includes an oil retention member 51. The oil-retaining member 51 is formed of a mesh-like metal member capable of absorbing or adsorbing lubricating oil or a porous resin member in a substantially block shape (for example, a rectangular parallelepiped shape). The material of the oil-retaining member 51 is not particularly limited, and may be, for example, a fibrous member or a non-woven fabric as long as it is a member capable of absorbing or adsorbing lubricating oil.

In the first embodiment, the oil retention member 51 is fixed to the housing front wall portion 42 below the insertion hole 43 (crankshaft 30) by, for example, a bolt or the like. The length of the oil holding member 51 in the vertical direction (vertical direction) is not particularly limited, and can be appropriately set within a range in which the upper end portion thereof does not interfere with the outer peripheral surface of the crankshaft 30 (see FIG. 1). .. The protruding length of the oil-retaining member 51 from the housing front wall portion 42 is not particularly limited, and can be appropriately set within a length range that does not interfere with the flywheel 37 (see FIG. 1). The length of the oil-retaining member 51 in the lateral direction (the direction orthogonal to the axial direction of the crankshaft 30 in the horizontal direction) is not particularly limited, but is preferably formed longer than the hole diameter of the insertion hole 43.

When the oil retaining member 51 is provided in the housing front wall portion 42 below the insertion hole 43 in this way, the lubricating oil that enters from the engine body 11 side through the gap between the crankshaft 30 and the insertion hole 43 can be discharged. The oil is absorbed or adsorbed by the oil retaining member 51 in the process of flowing downward along the front wall portion 42 of the housing, so that the oil is retained in the oil retaining member 51.

As a result, for example, the engine 10 tilts with the front end portion 35 of the crank shaft 30 positioned above the rear end portion 36, or the oil level of the lubricating oil stored in the oil pan 19 becomes high. As a result, even if the rear sealing member 29 is submerged in oil, the lubricating oil that infiltrates from the engine 10 side due to the submersion in oil can be reliably held by the oil retaining member 51, and the lubricating oil can be reliably held to the outside of the fly wheel housing 40. It is possible to effectively prevent the leakage of lubricating oil.

[Second Embodiment]
FIG. 3 is a schematic perspective view showing the oil retention structure 50 according to the second embodiment.

As shown in FIG. 3, the oil retention structure 50 of the second embodiment is configured to further include a rib body 52 erected on the front wall portion 42 of the housing. Specifically, the rib body 52 has a plurality of vertical ribs 53 and horizontal ribs 54.

The plurality of vertical ribs 53 project from the front wall portion 42 of the housing toward the flywheel 37 (see FIG. 1) and extend in parallel in the vertical direction (vertical direction). The length of the vertical rib 53 is not particularly limited, and can be appropriately set within a range in which the upper end portion thereof does not interfere with the outer peripheral surface of the crankshaft 30 (see FIG. 1). The protruding length of the vertical rib 53 from the housing front wall portion 42 is not particularly limited, and can be appropriately set within a length range that does not interfere with the flywheel 37 (see FIG. 1). Further, the number of vertical ribs 53 is not limited to two in the illustrated example, and may be three or more.

The horizontal ribs 54 project from the front wall portion 42 of the housing toward the flywheel 37 (see FIG. 1) and extend in the lateral direction to connect the lower ends of the vertical ribs 53. The protruding length of the lateral rib 54 from the housing front wall portion 42 is not particularly limited, and can be appropriately set within a length range that does not interfere with the flywheel 37 (see FIG. 1). By connecting the lower ends of the vertical ribs 53 with the horizontal ribs 54 and closing them in this way, a substantially U-shaped rib body 52 that opens upward is formed on the wall surface of the housing front wall portion 42.

In the second embodiment, the oil retaining member 51 is attached by fitting the vertical ribs 53 of the rib body 52 into the space facing each other. By attaching the oil retaining member 51 to the rib body 52 below the insertion hole 43 in this way, the lubricating oil that penetrates from the engine body 11 side through the gap between the crankshaft 30 and the insertion hole 43 can be removed. In the process of flowing downward along the front wall portion 42 of the housing in the vertical direction, the oil retaining member 51 housed in the rib body 52 effectively absorbs or adsorbs the oil. As a result, as in the first embodiment, it is possible to effectively prevent the lubricating oil that has entered from the engine 10 side from leaking to the outside of the flywheel housing 40.

Further, by fitting the oil-retaining member 51 into the U-shaped rib 52 body, the downward flow of the lubricating oil absorbed or adsorbed by the oil-retaining member 51 can be blocked by the lateral rib 54. , It becomes possible to more reliably prevent the lubricating oil from leaking to the outside of the flywheel housing 40. Further, by projecting a plurality of vertical ribs 53 and horizontal ribs 54 on the front wall portion 42 of the housing, the rigidity of the flywheel housing 40 can be effectively improved.

[Third Embodiment]
FIG. 4 is a schematic cross-sectional view showing the oil holding structure 50 according to the third embodiment.

As shown in FIG. 4, the oil retention structure 50 of the third embodiment is configured to further include a recess 55 recessed in the housing front wall portion 42. Specifically, the recess 55 is recessed in a portion below the insertion hole 43 of the housing front wall portion 42 from the wall surface of the housing front wall portion 42 to the engine main body portion 11 side at a predetermined depth. The depth (recess amount) of the recess 55 is not particularly limited, and can be appropriately set as long as it does not penetrate the housing front wall portion 42.

In the third embodiment, the oil retaining member 51 is attached by fitting it into the recess 55. By mounting the oil retaining member 51 in the recess 55 below the insertion hole 43 in this way, the lubricating oil that penetrates from the engine body 11 side through the gap between the crankshaft 30 and the insertion hole 43 can be removed. In the process of flowing downward along the front wall portion 42 of the housing in the vertical direction, the oil retaining member 51 housed in the recess 55 effectively absorbs or adsorbs the oil. As a result, as in the first and second embodiments, it is possible to effectively prevent the lubricating oil that has entered from the engine 10 side from leaking to the outside of the flywheel housing 40.

Further, by fitting the oil-retaining member 51 into the recess 55 recessed from the front wall portion 42 of the housing, the downward flow of the lubricating oil absorbed or adsorbed by the oil-retaining member 51 is blocked by the lower surface of the recess 55. This makes it possible to more reliably prevent the lubricating oil from leaking to the outside of the flywheel housing 40. Further, by providing the recess 55 in the housing front wall portion 42, it is possible to reduce the weight of the flywheel housing 40.

[others]
The present disclosure is not limited to the above-described embodiment, and can be appropriately modified and implemented without departing from the spirit of the present disclosure.

For example, the oil retention structure 50 of the present disclosure can also be applied to the case front wall portion 16A of the engine 10. In this case, it is possible to effectively prevent the lubricating oil from leaking to the crank pulley side or the peripheral region thereof.

Further, the oil-retaining structure 50 of the present disclosure may be provided in a mechanical device (device main body) other than the engine 10, and may be provided in, for example, a transmission, a differential gear device, or the like connected to the flywheel housing 40 of the engine 10. May be done.

10 Engine (mechanical device)
11 Engine body (device body)
12 Head cover 13 Cylinder head 14 Cylinder block 14A Block front wall 14B Block rear wall 15 Partition
16 Crankcase 16A Case front wall 16B Case rear wall 17 Ladder frame 18 Bearing cap 19 Oil pan C1 to C4 Cylinder P1 to P4 Piston 21 Piston pin 22 Connecting rod 29 Rear sealing member 30 Crankshaft (shaft part)
31 Crankpin 32 Journal part 33 Crank web 34 Counterweight 35 Front end part 36 Rear end part 37 Flywheel 40 Flywheel housing 41 Housing peripheral wall part 42 Housing front wall part (outer wall part, housing wall part)
43 Insertion hole 50 Oil retention structure 51 Oil retention member 52 Rib body 53 Vertical rib 54 Horizontal rib 55 Recess

Claims (6)

An oil-retaining structure for holding lubricating oil leaking from the insertion hole to the outer wall portion in an outer wall portion having an insertion hole through which a shaft component penetrating the device main body portion is inserted.
An oil-retaining structure characterized in that an oil-retaining member capable of absorbing or adsorbing the lubricating oil is provided at a portion of the outer wall portion below the insertion hole. The main body of the device is the main body of the engine.
The oil-retaining structure according to claim 1, wherein the shaft component is a crankshaft that penetrates the engine body. The oil-retaining structure according to claim 2, wherein the outer wall portion is a housing wall portion fixed to the engine main body portion of a flywheel housing accommodating a flywheel attached to one end portion of the crankshaft. A plurality of ribs facing each other are further provided while projecting from a portion of the outer wall portion below the insertion hole to the side opposite to the device main body portion.
The oil-retaining structure according to any one of claims 1 to 3, wherein the oil-retaining member is provided in a space facing the plurality of ribs. Further provided with a recess recessed from a portion of the outer wall portion below the insertion hole toward the device main body portion.
The oil-retaining structure according to any one of claims 1 to 3, wherein the oil-retaining member is provided inside the recess. The oil-retaining structure according to any one of claims 1 to 5, wherein the oil-retaining member is formed of a mesh-shaped metal member or a porous resin member.

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