JP2021161910A - 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 reservoir having a dent part 52 capable of storing 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. An oil reservoir having a recessed portion capable of storing the lubricating oil is provided at a portion below the insertion hole of the above.

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 recessed portion is formed by a recessed groove that is recessed in the upper surface of a protruding portion that protrudes from a portion of the outer wall portion below the insertion hole to the side opposite to the device main body portion and opens upward. It is preferable to have.

Further, the recessed portion is recessed from a portion of the outer wall portion below the insertion hole toward the device main body portion, and is erected upward from the lower end of the opening of the recessed portion of the recessed portion. It is preferably formed by a weir wall that separates the oil inlet from the upper end of the opening.

Further, it is preferable that an oil-retaining member capable of absorbing or adsorbing lubricating oil is housed inside the recessed portion.

Further, it is preferable that the recessed portion is formed of a plurality of bottomed recessed holes recessed in a portion of the outer wall portion below the insertion hole.

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 cross-sectional view which shows the oil-retaining structure which concerns on 2nd Embodiment. It is a schematic perspective view which shows the oil-retaining structure which concerns on other embodiment. It is a schematic cross-sectional view which shows the oil-retaining structure which concerns on other embodiment. It is a schematic cross-sectional view which shows the oil-retaining structure which concerns on other 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 is composed of an oil sump projecting from a portion below the insertion hole 43 of the housing front wall portion 42. Specifically, the oil retention structure 50 is a substantially block-shaped (for example, rectangular parallelepiped) protruding portion that protrudes toward the flywheel 37 (see FIG. 1) from a portion below the insertion hole 43 of the housing front wall portion 42. A bottomed groove 52 that is recessed downward from the upper surface of the protruding portion 51 and opens upward is provided.

The length of the protruding portion 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 length of the protrusion 51 protruding from the front wall portion 42 of the housing 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 opening width of the concave groove 52 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 wider than the hole diameter of the insertion hole 43.

In this way, by providing an oil reservoir having a concave groove 52 that opens upward in the housing front wall portion 42 below the insertion hole 43, a gap between the crankshaft 30 and the insertion hole 43 is provided from the engine main body portion 11 side. The lubricating oil that has passed through and infiltrates is collected in the concave groove 52 in the process of flowing downward along the front wall portion 42 of the housing in the vertical direction, and is held in the concave groove 52.

As a result, for example, the engine 10 tilts with the front end portion 35 of the crankshaft 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 concave groove 52 of the oil sump, and the outside of the fly wheel housing 40 It is possible to effectively prevent the leakage of the lubricating oil to. Further, by projecting the protruding portion 51 from the front wall portion 42 of the housing, it is possible to effectively improve the rigidity of the flywheel housing 40.

[Second Embodiment]
FIG. 3 is a schematic cross-sectional view showing the oil holding structure 50 according to the second embodiment.

As shown in FIG. 3, the oil retention structure 50 of the third embodiment is composed of an oil sump recessed in a portion below the insertion hole 43 of the housing front wall portion 42. Specifically, the oil retention structure 50 has a recess 53 recessed from a portion below the insertion hole 43 of the housing front wall portion 42 toward the engine body portion 11 and an opening facing the inside of the flywheel housing 40 of the recess 53. It is provided with a weir wall 54 erected above the lower end.

The weir wall 54 is formed to be lower than the opening height of the recess 53, and an oil inlet 55 is formed between the upper end of the weir wall 54 and the upper end of the opening of the recess 53. The upper surface 53A of the recess 53 is preferably formed so as to be inclined obliquely downward from the upper end of the opening of the recess 53 so that the lubricating oil smoothly flows from the oil inlet 55.

The amount of the recess 53 is not particularly limited, and can be appropriately set as long as it does not penetrate the housing front wall portion 42. The opening widths of the recess 53 and the oil inlet 55 are also not particularly limited, but are preferably formed to be wider than the hole diameter of the insertion hole 43.

In this way, the recess 53 is provided in the portion below the insertion hole 43 of the housing front wall portion 42, and the weir wall 54 is erected from the lower end of the opening of the recess 53, whereby the crankshaft 30 is erected from the engine body 11 side. The lubricating oil that penetrates through the gap between the and the insertion hole 43 is taken into the recess 53 from the oil inlet 55 in the process of flowing downward along the front wall portion 42 of the housing in the vertical direction. The lubricating oil taken into the recess 53 is held in the recess 53 by the weir wall 54, so that the lubricating oil can be effectively prevented from leaking to the outside of the flywheel housing 40. Further, by providing the recess 53 in the front wall portion 42 of the housing, 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, as shown in FIG. 4, an oil holding member 56 capable of absorbing or adsorbing lubricating oil may be provided in the recessed groove 52 of the first embodiment. Further, as shown in FIG. 5, an oil holding member 56 capable of absorbing or adsorbing lubricating oil may be provided in the recess 53 of the second embodiment. The material of the oil-retaining member 56 is not particularly limited, and as long as it is a member capable of absorbing or adsorbing lubricating oil, for example, a mesh-shaped metal member, a porous resin member, a fibrous member, a non-woven fabric, or the like may be used. Can be done. If the oil holding member 56 is provided, it is possible to effectively suppress the leakage of the lubricating oil due to the influence of the vibration of the engine 10 or the vibration transmitted from the vehicle side.

Further, as shown in FIG. 6, the oil-retaining structure 50 of the present disclosure is formed by providing a plurality of bottomed fine concave holes 57 from the wall surface below the insertion hole 43 of the housing front wall portion 42. May be good. In this case, it is preferable that the hole diameter and depth of the concave hole 57 are formed so as to be able to effectively hold and store the lubricating oil due to a capillary phenomenon or the like.

Further, 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, etc. 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 (housing wall part)
43 Insertion hole 50 Oil retention structure 51 Protrusion 52 Concave groove 53 Recess 54 Weir wall 55 Oil inlet 56 Oil retention member 57 Concave hole

Claims (7)

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 reservoir having a recessed portion capable of storing the lubricating oil is provided in 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 claim in which the recess is formed by a recess that is recessed in the upper surface of a protrusion that protrudes from a portion of the outer wall below the insertion hole to the side opposite to the main body of the device and opens upward. The oil-retaining structure according to any one of Items 1 to 3. The recessed portion is recessed from a portion of the outer wall portion below the insertion hole toward the device main body portion, and is erected upward from the lower end of the opening of the recessed portion to be erected upward from the lower end of the opening of the recessed portion. The oil-retaining structure according to any one of claims 1 to 3, which is formed by a weir wall for partitioning an oil inlet between the two. The oil-retaining structure according to any one of claims 1 to 5, wherein an oil-retaining member capable of absorbing or adsorbing lubricating oil is housed inside the recess. The oil-retaining structure according to any one of claims 1 to 3, wherein the recessed portion is formed of a plurality of bottomed recessed holes recessed in a portion of the outer wall portion below the insertion hole.

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