JP2015206309A - Lubrication oil supply structure of engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lubrication oil supply structure of an engine which enables improvement of lubrication performance of a crank sprocket while preventing deterioration of the fuel consumption performance.SOLUTION: A plate (25) is disposed below a cylinder bore (20). The plate (25) includes: an oil receiving part (27) which collects a lubrication oil dropped from an inner peripheral wall (26) of the cylinder bore (20); and a guide part (28) which extends from the oil receiving part (27) to the side of a crank sprocket (11) in an axis direction of a crank shaft (12) and supplies the lubrication oil to the crank sprocket (11).

Description

  The present invention relates to a lubricating oil supply structure for an engine, and more particularly, to a lubricating oil supply structure for an engine that uses engine lubricating oil for lubricating a crank sprocket.

2. Description of the Related Art Conventionally, an engine mounted on a vehicle has a structure that supplies lubricating oil to a crank sprocket around which a timing chain is wound.
As such an engine lubricating oil supply structure, for example, there are the following prior art documents.

Japanese Utility Model Publication No. 2-91254

  In the gear meshing portion oil supply structure according to Patent Document 1, the oil gallery is extended to above the crankshaft gear (crank sprocket), and an oil jet is provided so as to restrict the oil passage above the crankshaft gear. It is a structure that sprays lubricating oil.

  By the way, in the above-mentioned Patent Document 1, it is necessary to provide an oil jet that squeezes the oil path, and it is necessary to squeeze the oil path rapidly, and strong pumping of lubricating oil is required. There is a possibility that the load on the pump, that is, the load on the engine increases, and the fuel efficiency decreases. For this reason, it has been impossible to obtain both the reduction in fuel consumption performance and the lubrication performance of the crankshaft gear (crank sprocket), and an improvement has been desired.

  Accordingly, an object of the present invention is to provide an engine lubricating oil supply structure capable of improving the lubrication performance of a crank sprocket while preventing a decrease in fuel consumption performance.

  The present invention includes a cylinder block having a cylinder bore, a piston that is reciprocally inserted into the cylinder bore, a crankshaft that rotates in accordance with the reciprocating motion of the piston, and the cylinder bore in an axial direction of the crankshaft. A crank sprocket that is arranged at an adjacent position and on which a timing chain is wound. An oil receiving portion that collects lubricating oil to be collected and a guide portion that extends from the oil receiving portion in the axial direction of the crankshaft and toward the crank sprocket to supply the lubricating oil to the crank sprocket are disposed. It is characterized by that.

  The present invention can improve the lubrication performance of the crank sprocket while preventing a decrease in fuel consumption performance.

FIG. 1 is a side view of a vehicle equipped with an engine with a chain case removed. (Example) 2 is a cross-sectional view of the cylinder block taken along line II-II in FIG. (Example) FIG. 3 is an enlarged view of the plate portion of FIG. (Example) 4 is a cross-sectional view of the cylinder block taken along line IV-IV in FIG. (Example) FIG. 5 is a sectional view of a cylinder block in a modification of the present invention. (Modification) 6 is a cross-sectional view of the cylinder block taken along line VI-VI in FIG. (Modification)

  The present invention achieves the purpose of improving the lubrication performance of the crank sprocket while preventing the fuel efficiency performance from being lowered by disposing a plate provided with an oil receiving portion and a guide portion below the cylinder bore.

1 to 4 show an embodiment of the present invention.
As shown in FIG. 1, the vehicle 1 includes an engine room 5 formed by an engine hood 2, a dash panel 3, and a front grill 4.
In the engine room 5, an engine 6 is disposed horizontally. The engine 6 includes a cylinder block 7, a cylinder head 8, an oil pan 9, and a cylinder head cover 10.
A crankshaft 12 having a crank sprocket 11 at the left end is rotatably supported on the cylinder block 7 of the engine 6.
An intake side camshaft 14 provided with an intake side sprocket 13 and an exhaust side camshaft 16 provided with an exhaust side sprocket 15 are rotatably supported side by side on the cylinder head 8 of the engine 6.
A timing chain 17 is wound around the crank sprocket 11, the intake side sprocket 13, and the exhaust side sprocket 15.

As shown in FIG. 2, a cylinder block sleeve hole 18 having a circular cross section is formed in the cylinder block 7 in the vertical direction, and a cylinder block sleeve 19 is inserted into the cylinder block sleeve hole 18. The cylinder block sleeve 19 forms a cylinder bore 20.
A piston 21 is inserted into the cylinder bore 20 so as to be reciprocally movable in the vertical direction. The piston 21 is connected to the crankshaft 12 via a piston rod 22. As a result, the crankshaft 12 rotates as the piston 21 reciprocates.
The crank sprocket 11 around which the timing chain 17 is wound is disposed at a position adjacent to the cylinder bore 20 in the axial direction of the crankshaft 12 (the vehicle left-right direction).
A chain case 23 is attached to the left side surface of the engine 6 so as to cover the timing chain 17.

  As shown in FIG. 2, the engine 6 is provided with a lubricating oil supply device 24 that supplies lubricating oil to the crank sprocket 11. The lubricating oil supply device 24 arranges a plate 25 attached to the cylinder block 7 by predetermined attachment means below the cylinder bore 20 (below the lowest point of the piston 21). Lubricating oil supplied to the crank sprocket 11 is pumped by driving an oil pump and lubricates each part of the engine 6. The plate 25 is formed, for example, in a bowl shape that opens upward so as to collect the lubricating oil falling from the inner peripheral wall 26 (inner peripheral surface of the cylinder block sleeve 19) 26 of the cylinder bore 20 and guide it to the crankshaft 12 side. Is done.

As shown in FIG. 2, the plate 25 includes an oil receiving portion 27 and a guide portion 28 connected to the oil receiving portion 27, and is arranged in the vehicle left-right direction and in the horizontal direction.
The oil receiving portion 27 collects the lubricating oil falling from the inner peripheral wall (inner peripheral surface of the cylinder block sleeve 19) 26 of the cylinder bore 20.
As shown in FIG. 4, the oil receiving portion 27 has a substantially semicircular one-side receiving portion 27-1 and a one-side receiving portion 27-1 as an arc shape curved along the cylinder bore 20 in a plan view. The other side receiving part 27-2 having a substantially semicircular shape facing the cylinder axis C with respect to the other side. As shown in FIG. 4, the one-side receiving portion 27-1 and the other-side receiving portion 27-2 have a circular shape along the cylinder bore 20, and include a receiving-side bottom portion 29A and both side ends of the receiving-side bottom portion 29A. It is formed in a bowl shape that opens upward from the receiving side outer wall portion 29B and the receiving side inner wall portion 29C.
Further, as shown in FIG. 3, the oil receiving portion 27 includes a collecting portion 27 </ b> A on the side (right side) away from the crank sprocket 11 with respect to the cylinder axis C and a crank sprocket 11 with respect to the cylinder axis C as viewed from the side. Side (left side) flow part 27B.
The collecting unit 27A collects the lubricating oil whose center line M1 is disposed horizontally in the left-right direction of the vehicle and falls from the right side of the inner peripheral wall 26 of the cylinder bore 20.
The flow lower portion 27B is inclined downward on the crank sprocket 11 side at a predetermined angle θ1 from the intersection O where the center line M2 intersects the cylinder axis C and the center line M1 of the collecting portion 27A.
The flow lower part 27B collects the lubricating oil falling from the left side of the inner peripheral wall 26 of the cylinder bore 20 and flows it down to the guide part 28 side, and also causes the lubricating oil from the collecting part 27A to flow down to the guide part 28 side.
The guide portion 28 extends from the oil receiving portion 27 in the axial direction of the crankshaft 12 (the vehicle left-right direction) and toward the crank sprocket 11 to guide the lubricating oil to the crank sprocket 11. As shown in FIG. 4, the guide portion 28 is linear and includes a guide-side bottom portion 30A, a guide-side one wall portion 30B and a guide-side other wall portion 30C that rise at both ends of the guide-side bottom portion 30A. It is formed in a bowl shape that opens upward.
Further, as shown in FIG. 3, the guide portion 28 is disposed at a location where the center line M3 is lower than the center line M1 of the collection portion 27A by a height H and parallel to the center line M1 of the collection portion 27A. The Further, the tip portion of the guide portion 28 is disposed near the crank sprocket 11.
Accordingly, the lubricating oil inside the oil receiving portion 27 flows smoothly from the flow lower portion 27 </ b> B to the guide portion 28, and actively flows to the crank sprocket 11.
Note that the collecting portion 27A and the guide portion 28 of the oil receiving portion 27 may be inclined as in the case of the flow lower portion 27B.

Next, the flow of lubricating oil supplied to the crank sprocket 11 will be described.
Lubricating oil falling from the inner peripheral wall (inner peripheral surface of the cylinder block sleeve 19) 26 of the cylinder bore 20 is collected in the oil receiving portion 27 of the plate 25 located below.
The lubricating oil collected in the oil receiving portion 27 flows smoothly from the flow lower portion 27 </ b> B to the guide portion 28, is guided to the guide portion 28, and is actively supplied to the crank sprocket 11.

As a result, in this embodiment, as shown in FIG. 4, the lubricating oil flowing down the inner peripheral wall 26 of the cylinder bore 20 and flowing down to the lower oil pan 9 side can be transmitted from the oil receiving portion 27 to the guide portion 28. The lubricating oil can be supplied to the crank sprocket 11 from the tip portion of the guide portion 28. Thereby, the lubricity of the crank sprocket 11 can be improved.
Further, since lubricating oil is supplied to the crank sprocket 11 without providing an oil jet as in the prior art, there is no need to increase the output of the oil pump, and the load on the oil pump, that is, the load on the engine 6 is reduced. It is possible to reduce the fuel consumption performance.
Therefore, in this embodiment, it is possible to achieve both prevention of deterioration of fuel consumption performance and improvement of lubrication performance of the crank sprocket 11.

Further, as shown in FIG. 4, in the lubricating oil supply device 24, the oil receiving portion 27 of the plate 25 has a substantially semicircular one-side receiving portion 27-1 as an arc shape that curves along the cylinder bore 20, A substantially semicircular other-side receiving portion 27-2 that faces the one-side receiving portion 27-1 across the cylinder axis C is formed.
With such a structure, the amount of collected lubricating oil can be increased, and the lubricating performance of the crank sprocket 11 can be reliably improved.

5 and 6 show a modification of the present invention.
As shown in FIGS. 5 and 6, the plate 25 is formed with a notch 31 at the bottommost part of the flow part 27 </ b> B of the oil receiving part 27. A lubricating oil supply passage 33 is formed in the bearing 32 that holds the crankshaft 12, vertically below the notch 31.
The lubricating oil supply passage 33 has a function as the guide portion 28 and is formed by the inclined hole 34 and the guide hole 35.
The inclined hole 34 is inclined downward on the crank sprocket 11 side with the center line M4 at a predetermined angle θ2 with respect to the horizontal line L. The inclined hole 34 includes an introduction opening 33 </ b> A of the lubricating oil supply passage 33 that receives the lubricating oil falling from the notch 31, and actively causes the lubricating oil from above to flow down to the guide hole 35.
The guide hole 35 communicates with the inclined hole 34 and extends in the horizontal direction toward the crank sprocket 11 side. The guide hole 35 includes a discharge opening 33 </ b> B of a lubricant supply passage 33 that discharges the lubricant from the inclined hole 34 to the crank sprocket 11.
With such a structure, the lubricating oil from the flow lower part 27B of the oil receiving part 27 falls downward from the notch part 31 and enters the inclined hole 34 from the introduction opening 33A, and then smoothly guides from the inclined hole 34. It flows into the hole 35 and is supplied to the crank sprocket 11 from the discharge opening 33B.
As a result, the lubricating oil can be reliably guided from the lubricating oil supply passage 33 to the crank sprocket 11 side, and the lubricating performance of the crank sprocket 11 can be improved. Further, since the lubricating oil supply passage 33 is formed in the bearing 32 as a part of the flow path through which the lubricating oil from the oil receiving portion 27 flows, the number of parts can be reduced and the configuration can be simplified.

  The lubricating oil supply structure according to the present invention can be applied to other various engines.

1 vehicle
5 Engine room
6 Engine
7 Cylinder block
11 Crank sprocket
12 Crankshaft
17 Timing chain
19 Cylinder block sleeve
20 Cylinder bore
23 Chain case
24 Lubricating oil supply device
25 plates
26 Inner wall of cylinder bore
27 Oil receiver
27-1 One side receiving part
27-2 Other side receiving part
27A Collection Department
27B Lower stream
28 Guide section
31 Notch
32 Bearing
33 Lubricating oil supply passage

Claims (2)

  A cylinder block having a cylinder bore, a piston that is reciprocally inserted into the cylinder bore, a crankshaft that rotates as the piston reciprocates, and a position adjacent to the cylinder bore in the axial direction of the crankshaft. An engine lubricating oil supply structure for supplying a lubricating oil to the crank sprocket, and a lubricating oil falling from an inner peripheral wall of the cylinder bore is provided below the cylinder bore A plate having an oil receiving portion to be collected and a guide portion that extends from the oil receiving portion in the axial direction of the crankshaft and toward the crank sprocket and supplies lubricating oil to the crank sprocket is disposed. Lubricant supply for engines Elephants.   The engine oil supply structure according to claim 1, wherein the oil receiving portion is formed in an arc shape that curves along the cylinder bore.

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