JP2019094863A - Oil supply mechanism - Google Patents

Abstract

To provide an oil supply mechanism capable of increasing an oil supply amount into a cylinder.SOLUTION: An oil supply mechanism includes an oil groove 19 annularly formed in a crank web 9 coaxially with a crank pin 5 and receiving oil from the crank pin 5, an oil injection hole 20 formed in the crank web 9 so as to inject oil in the oil groove 19 toward a cylinder 1, and a protrusion 21 provided in a large end 11 in such a manner of protruding into the oil groove 19. The protrusion 21 is arranged so as to approach an inlet 20a of the oil injection hole 20 when an outlet 20c of the oil injection hole 20 is turned toward a direction of the cylinder 1.SELECTED DRAWING: Figure 5

Description

  The present disclosure relates to an oil supply mechanism for supplying oil into a cylinder of an engine.

  In the engine cylinder, the piston slides along the cylinder inner surface. Therefore, the engine is provided with a mechanism or the like for supplying oil to the inner surface of the cylinder. For example, as a mechanism for supplying oil to the inner surface of a cylinder, there is one in which an oil passage communicating with a crank pin is formed on a crankshaft and oil is supplied to the oil passage abundantly. According to such a mechanism, the oil after lubricating the crank pin can be raised by the rotation of the crankshaft and supplied to the inner surface of the cylinder.

JP, 2016-217501, A JP, 2013-79630, A Unexamined-Japanese-Patent No. 2006-29523

  However, in the mechanism in which the oil is flipped up by the rotation of the crankshaft, it may be considered that a sufficient amount of oil can not be supplied to the inner surface of the cylinder.

  Therefore, the present disclosure has been made in view of such circumstances, and an object thereof is to provide an oil supply mechanism capable of increasing the amount of oil supplied to the inner surface of a cylinder.

According to one aspect of the invention,
An oil groove coaxially formed with the crankpin on an inner surface of the crank web overlapping the large end of the connecting rod, and an oil groove for receiving oil from the crankpin;
An oil spout hole formed in the crank web for spouting the oil in the oil groove toward the inner surface of the cylinder;
And a projection provided at the large end and projecting into the oil groove,
An oil supply mechanism is provided, wherein the projection is arranged to approach the inlet of the oil jet hole when the outlet of the oil jet hole faces the direction of the cylinder.

  Preferably, the oil injection hole is formed at the tip of the crank web.

  Preferably, the inlet of the oil jet hole may be formed on the outer peripheral surface of the oil groove.

  Preferably, the inlet of the oil jet hole is inclined in a direction opposite to the rotational direction of the crank web.

  Further, at the outlet of the oil spouting hole, a throttling portion for throttling the flow path may be formed.

  Further, the oil groove may be provided with a gate member for blocking the oil groove so as to increase the pressure in the oil jet hole so as to be freely opened and closed.

  According to the present disclosure, the amount of oil supplied to the inner surface of the cylinder can be increased.

BRIEF DESCRIPTION OF THE DRAWINGS It is a principal part schematic diagram of the engine to which the oil supply mechanism which concerns on one embodiment of this invention is applied. It is principal part sectional drawing of a crankshaft and a connecting rod. It is a front view of a connecting rod. It is a principal part perspective view of a connecting rod. It is an AA arrow directional cross-sectional view of FIG. It is a front sectional view explaining operation of an oil supply mechanism. It is a front sectional view explaining operation of an oil supply mechanism. It is a front sectional view explaining operation of an oil supply mechanism. It is a principal part enlarged view of the oil supply mechanism which shows other embodiment. It is a principal part enlarged view of the oil supply mechanism which shows other embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the embodiment to be described later, for convenience of explanation, the moving direction of the piston during the compression stroke is upward, and the opposite direction is downward. Further, the left side in the drawing of FIG. 1 is taken as the front, and the right side in the drawing is taken as the rear.

  FIG. 1 is a schematic view of an essential part of an engine to which an oil supply mechanism according to the present embodiment is applied. FIG. 2 is a cross-sectional view of a crankshaft and a connecting rod showing an oil supply mechanism, showing a state of top dead center. The engine (internal combustion engine) E is a multi-cylinder compression ignition internal combustion engine mounted on a vehicle, that is, a diesel engine. Although the illustrated example shows an in-line four-cylinder engine, the cylinder arrangement type of the engine, the number of cylinders, and the like are arbitrary. Further, the engine E may be a gasoline engine.

  First, an engine to which the oil supply mechanism according to the present embodiment is applied will be described.

  The engine E has a cylinder block 2 in which a cylinder 1 is formed, a crankshaft 4 rotatably supported by the cylinder block 2 via a journal bearing 3, and a crank pin 5 of the crankshaft 4 so that its lower end can freely rotate. A connecting rod 6 to be connected and a piston 7 rotatably connected to the upper end of the connecting rod 6 and housed in the cylinder 1 are provided.

  The crankshaft 4 is rotatably supported by the journal bearing 3 and has a plurality of journals 8 axially spaced from each other, and a crank web 9 radially extending at the end of each journal 8. And a crank pin 5 provided eccentrically with respect to the journal 8 between the opposing crank webs 9 and a counterweight 10 provided on the crank web 9 so as to extend in the opposite direction to the crank web 9.

  The connecting rod 6 has a large end 11 formed at the lower end and rotatably coupled to the crank pin 5, a small end 12 formed at the upper end and rotatably coupled to the piston 7, and the large end 11. And a rod-like rod body portion 13 formed between the small end portions 12.

  The cylinder block 2 constitutes an outer shell of the engine E. In the cylinder block 2, a main gallery 14 is formed, and a first oil passage 15 for supplying oil from the main gallery 14 to the journal bearing 3 is formed. A pump P is connected to the main gallery 14. The pump P supplies the oil from the oil pan 16 to the main gallery 14 and is driven by the power from the crankshaft 4. The pump P may be driven by a drive device such as a motor.

  The crankshaft 4 is provided with a second oil passage 17 for guiding the oil from the first oil passage 15 to the crank pin 5.

  Next, the oil supply mechanism according to the present embodiment will be described.

  As shown in FIGS. 2 and 3, the oil supply mechanism 18 includes an oil groove 19 formed in the crank web 9 of the crankshaft 4 and receiving oil from the crank pin 5, and an oil groove 19 formed in the crank web 9. An oil jet hole 20 for jetting oil toward the inner surface of the cylinder 1 (see FIG. 1) and a projection 21 provided at the large end 11 of the connecting rod 6 and projected into the oil groove 19 are provided.

  The oil groove 19 is formed on the inner surface 9 a of the crank web 9 overlapping the large end 11 and is formed in an annular shape coaxial with the crank pin 5. In addition, the oil groove 19 is formed to have a rectangular cross section. The cross-sectional shape of the oil groove 19 is not limited to this. For example, the oil groove 19 may be formed in a semicircular cross section.

  As shown in FIGS. 2 and 5, the oil injection hole 20 is formed at the tip 9 b of the crank web 9. Here, the tip end portion 9 b of the crank web 9 refers to a portion of the crank web 9 facing the crank pin 5 in which the distance from the center of rotation of the journal 8 is farther than the center of the crank pin 5. Further, the inlet 20 a of the oil jet hole 20 is formed in the oil groove 19 of the crank web leading end 9 b and is formed on the outer peripheral surface 19 a of the oil groove 19. In particular, the inlet 20 b of the oil jet hole 20, that is, the oil jet hole 20 in a portion branched from the oil groove 19 is inclined in the direction opposite to the rotation direction R of the crank web 9. As a result, the oil spouting hole 20 is inclined in the rotational direction of the protrusion 21 that rotates relative to the oil groove 19. Therefore, the oil pressed by the projection 21 is efficiently ejected from the oil ejection hole 20 to the outside of the crank web 9. Further, the outlet 20 c of the oil jet hole 20 is formed to open at the tip outer surface of the crank web 9. Although the oil jet holes 20 are illustrated as extending in the same direction as the inlet 20b, the present invention is not limited thereto. The oil jet holes 20 downstream of the inlet 20b may extend in a direction different from that of the inlet 20b.

  As shown in FIGS. 4 and 5, the projection 21 is for pushing the oil in the oil groove 19 in the circumferential direction of the oil groove 19, and is projected in the axial direction of the crank pin 5 from the large end 11. Ru. In addition, the protrusion 21 is formed in a cylindrical shape to be loosely fitted in the oil groove 19. The protrusion 21 approaches the outer peripheral surface 19 a, the inner peripheral surface 19 b and the bottom surface 19 c of the oil groove 19 with a minute gap, and partitions the inside of the oil groove 19 in the circumferential direction. Furthermore, in particular, the projection 21 is disposed so as to approach the inlet 20 a of the oil jet hole 20 when the outlet 20 c of the oil jet hole 20 faces the cylinder 1, that is, upward.

  The operation of the present embodiment will be described.

  FIG. 5 is a cross-sectional view taken along line AA of FIG. 2 and shows the positional relationship between the protrusion 21 and the oil injection hole 20 at the top dead center. FIG. 6 shows a state where the crankshaft 4 has been rotated 90 ° from the state of FIG. FIG. 7 shows a state where the crankshaft 4 has been rotated 180 ° from the state of FIG. FIG. 8 shows a state immediately before the top dead center in which the projection 21 approaches the inlet 20 a of the oil jet hole 20 by further rotating the crankshaft by an angle of less than 90 ° from the state of FIG. 7.

  As shown in FIG. 1, when the crankshaft 4 is rotated, the pump P is driven. The pump P sucks the oil from the oil pan 16 and supplies the oil to the main gallery 14. The oil supplied to the main gallery 14 is supplied to the surface of the crankpin 5 via the first oil passage 15, the journal bearing 3 and the second oil passage 17. As shown in FIG. 2, the oil is continuously and abundantly supplied from the second oil passage 17 to the surface of the crank pin 5, spreads around the entire circumference of the crank pin 5, and flows toward both ends of the crank pin 5. Thus, the space between the crank pin 5 and the large end 11 is lubricated. The oil reaching the both ends of the crankpin 5 spreads radially outward of the crankpin 5 along the gap between the crank web 9 and the large end 11. As a result, the oil spreads between the crank web 9 and the large end 11 and accumulates in the oil groove 19. Then, a small portion of the oil accumulated in the oil groove 19 overflows radially outward and spreads between the crank web 9 and the large end 11 on the outer peripheral side of the oil groove 19.

  Further, as shown in FIGS. 5 and 6, the crank pin 5 is rotated about the journal 8 by the rotation of the crankshaft 4. Thus, the oil groove 19 coaxially disposed with the crank pin 5 is also rotated about the journal 8.

  The connecting rod 6 is restricted only in the vertical direction by the piston 7 and the cylinder 1 in the direction of movement of the small end 12. For this reason, the connecting rod 6 maintains a standing posture while being rotated about the journal 8 at the large end 11 side. As a result, the large end 11 is rotated relative to the crank pin 5 and the crank web 9, and the projection 21 provided on the large end 11 is also formed on the oil groove 19 formed on the crank web 9. It is relatively rotated along the circumferential direction.

  The protrusion 21 pushes the oil forward in the rotational direction by rotating relative to the oil groove 19. At this time, the oil is continuously and abundantly supplied into the oil groove 19. The oil has a relatively high viscosity, and the projection 21 is rotated relative to the oil groove 19 at a relatively high speed. Therefore, the oil at the front in the rotational direction of the protrusion 21 has a higher pressure than the oil at the rear in the rotational direction.

  As shown in FIGS. 7 and 8, when the protrusion 21 approaches the inlet 20 a of the oil jet hole 20 in this state, the hydraulic pressure at the inlet 20 a of the oil jet hole 20 rapidly rises, and the outlet 20 c of the oil jet hole 20 A relatively large amount of oil is expelled from the At this time, since the inlet 20b of the oil jet hole 20 is inclined in the direction opposite to the rotation direction of the crank web 9, oil is jetted from the oil groove 19 at a shallow angle with respect to the direction pressed by the projection 21. It is branched into the hole 20. Therefore, the oil pushed by the projection 21 is smoothly introduced into the oil jet hole 20. Further, as shown in FIG. 8, the oil jet hole 20 is in a posture in which the outlet 20 c is directed upward, and the piston 7 is in the vicinity of the top dead center. Therefore, the oil jetted from the outlet 20 c of the oil jet hole 20 flies upward and is supplied abundantly to the inner surface of the cylinder 1 below the piston 7.

  Thereafter, when the projection 21 passes through the inlet 20a of the oil jet hole 20, the oil pressure at the oil jet inlet 20a drops sharply, and the jet of oil temporarily stops or decreases.

  Thereafter, a large amount of oil is vigorously ejected from the outlet 20c of the oil ejection hole 20 every time the piston 7 approaches the top dead center, and oil ejection from the outlet 20c of the oil ejection hole 20 stops or decreases at other timings. Repeat the action of

  Thus, the oil supply mechanism 18 has an oil groove 19 annularly formed in the crank web 9 and receiving oil from the crank pin 5 and an oil in the oil groove 19 formed in the crank web 9 directed to the inner surface of the cylinder 1 The oil jet hole 20 for injecting oil and the projection 21 provided in the large end 11 and projected into the oil groove 19 are provided, and the projection 21 has the outlet 20 c of the oil injection hole 20 in the direction of the cylinder 1 When it faces, it is arranged to approach the inlet 20 a of the oil injection hole 20. Therefore, the oil supplied into the oil groove 19 can be jetted from the oil jet hole 20 toward the cylinder 1 in synchronization with the rotation of the crankshaft 4, and the oil supply amount into the cylinder 1 can be increased. Can.

  In addition, the oil injection hole 20 is formed at the tip 9 b of the crank web 9. Therefore, when the piston 7 is positioned in the vicinity of the top dead center, the oil can be ejected from the oil ejection hole 20, and the oil can be reliably supplied to the inner surface of the cylinder 1.

  Further, the inlet 20 a of the oil jet hole 20 is formed on the outer peripheral surface 19 a of the oil groove 19. For this reason, the oil which receives a centrifugal force by rotation of the crank web 9 can be easily ejected from the oil ejection hole 20.

  Further, the inlet 20 b of the oil injection hole 20 is inclined in the direction opposite to the rotation direction of the crank web 9. Therefore, the direction of the inlet 20b of the oil jet hole 20 can be made closer in the direction in which the projection 21 pushes the oil, and the oil in the oil groove 19 can be smoothly guided into the oil jet hole 20.

  Although the embodiments of the present invention have been described in detail above, the present invention can be applied to other embodiments as follows.

  (1) As shown in FIG. 9, at the outlet 20 c of the oil spouting hole 20, the throttling portion 30 for throttling the flow path may be formed. According to this, the force of the oil ejected from the oil ejection hole 20 can be intensified, and the oil can more reliably reach the inner surface of the cylinder 1.

  (2) As shown in FIG. 10, the oil groove 19 may be provided with a gate member 31 for blocking the oil groove 19 so as to increase the pressure in the oil jet hole 20 so as to be freely opened and closed. In this case, the gate member 31 may be disposed in the oil groove 19 on the relative rotation direction side of the protrusion 21 from the inlet 20 a of the oil jet hole 20. Further, it is preferable that the gate member 31 be pivotably supported by the crank web 9 partitioning the oil groove 19 in the direction of relative rotation of the projection 21. The crank web 9 partitioning the oil groove 19 may be provided with a spring 32 for urging the gate member 31 in the rising direction, that is, in the direction closing the oil groove 19.

  Furthermore, the crank web 9 may be formed with a recess 33 for accommodating the fallen gate member 31 and allowing passage of the protrusion. The spring 32 may be set to a spring strength that does not cause the gate member 31 to fall down under pressure when the protrusion 21 overlaps the position of the oil jet hole 20. According to this, the pressure in the relative rotational direction forward can be continued to be increased until the protrusion 21 overlaps the position of the oil jet hole 20, and the force of the oil jetted from the oil jet hole 20 can be strengthened. Then, the oil can more reliably reach the inner surface of the cylinder 1. In addition, after the protrusion 21 exceeds the position of the oil jet hole 20, the protrusion 21 abuts on the gate member 31, or pressure in the relative movement direction of the protrusion 21 acts on the gate member 31. Will open.

  The configurations of the embodiments described above can be partially or totally combined unless there is a particular contradiction. The embodiments of the present invention are not limited to the above-described embodiments, and all variations, applications, and equivalents included in the concept of the present invention defined by the claims are included in the present invention. Accordingly, the present invention should not be interpreted in a limited manner, and can be applied to any other technology falling within the scope of the present invention.

Reference Signs List 1 cylinder 5 crank pin 6 connecting rod 9 crank web 9a inner side surface 11 large end 18 oil supply mechanism 19 oil groove 20 oil ejection hole 20 a inlet 20 c outlet 21 protrusion

Claims (6)

An oil groove coaxially formed with the crankpin on an inner surface of the crank web overlapping the large end of the connecting rod, and an oil groove for receiving oil from the crankpin;
An oil spout hole formed in the crank web for spouting the oil in the oil groove toward a cylinder;
And a projection provided at the large end and projecting into the oil groove,
An oil supply mechanism characterized in that the projection is arranged to approach the inlet of the oil jet hole when the outlet of the oil jet hole faces the direction of the cylinder. The oil jet hole is formed at the tip of the crank web,
The oil supply mechanism according to claim 1, characterized in that: The oil supply device according to claim 1 or 2, wherein an inlet of the oil jet hole is formed on an outer peripheral surface of the oil groove. The oil supply mechanism according to any one of claims 1 to 3, wherein an inlet portion of the oil injection hole is inclined in a direction opposite to a rotation direction of the crank web. The oil supply mechanism according to any one of claims 1 to 4, wherein a throttling portion for throttling a flow path is formed at an outlet of the oil jet hole. The oil supply according to any one of claims 1 to 5, wherein the oil groove is provided with a gate member for blocking the oil groove so as to increase the pressure in the oil injection hole. mechanism.

Images