JP2009091940A - Engine crank shaft lubricating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reliably supply oil to roller bearings on the side of a crank pin. <P>SOLUTION: Between each of a cylinder block 10 and a bearing cap 11 and a crank journal 20 and between a connecting rod 4 and the crank pin 22, the roller shafts 3, 5 are provided, respectively. A first oil hole 10a is opened to the inner peripheral face of a bearing hole 12 of the cylinder block 10. A through-hole 31a is formed in an outer race 31 of the roller bearing 3. A communication groove 31b is formed in the outer peripheral face of the outer race 31. A ring groove 23 is formed in the end face of a crank arm 21 at the side of the crank journal 20 in the direction of a crank shaft. On the crank shaft 2, an annular member 6 is mounted which has blade portions 60, 60 covering the ring groove 23. A second oil hole 24 is opened at one end to a terminal portion 23a of the ring groove 23. The second oil hole 24 is opened at the other end to the outer peripheral face of the crank pin 22 through the crank arm 21 and the crank pin 22. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a lubricating device for an engine crankshaft.

  An engine crankshaft generally includes a crank journal that is supported by a cylinder block and a bearing cap, a crankpin that supports a large end portion of a connecting rod having a connecting rod body and a cap, and a crank arm that connects the crank journal and the crankpin. ing. A bearing is provided between the cylinder block and the bearing cap and the crank journal, and between the connecting rod and the crank pin.

  There is a metal as such a bearing, but this metal has a structure that supports the crank journal and the crank pin on the surface, and therefore has a high rotational resistance. This is not preferable from the viewpoint of improving fuel consumption. Therefore, the engine crankshaft of Patent Document 1 employs a roller bearing as a bearing for improving fuel efficiency.

  In the thing of patent document 1, the oil hole which one end is connected to an oil gallery and the other end opens to the bearing hole inner peripheral surface of a cylinder block is formed in the inside of a cylinder block. The oil from the oil gallery is supplied to the roller bearing on the crank journal side through the oil hole.

An oil receiving hole is formed on the end surface of the crank arm on the crank journal side. One end of the crank arm is open to the inner peripheral surface of the oil receiving hole and the other end is on the crank pin side of the crank arm. An oil hole is formed in the end face. The oil leaked from the end face of the roller bearing on the crank journal side is received by the oil receiving hole, and the oil is supplied from the end face to the roller bearing on the crank pin side through the oil hole.
Japanese Utility Model Publication No. 1-145910

  Thus, in the thing of patent document 1, since the oil which leaked from the roller bearing end surface by the side of a crank journal is only received by an oil receiving hole, there exists a possibility that oil cannot be reliably supplied to an oil receiving hole. . Even if oil can be supplied to the oil receiving hole, the end face of the roller bearing on the crankpin side is narrow, so there is a possibility that oil cannot be supplied without fail to the roller bearing on the crankpin side. For these reasons, there is a risk that the roller bearing on the crankpin side cannot be reliably lubricated.

  The present invention has been made in view of such a point, and an object thereof is to reliably supply oil to a roller bearing on the crankpin side.

  A first invention includes a crank journal supported by a cylinder block and a bearing cap, a crank pin that supports a large end portion of a connecting rod having a connecting rod body and a cap, and a crank arm that connects the crank journal and the crank pin. An engine crankshaft lubrication device provided with roller bearings provided between the cylinder block and the bearing cap and the crank journal, and between the connecting rod and the crankpin, respectively. The roller bearing on the journal side has an outer race that is non-rotatably provided on the inner peripheral surface of the bearing hole of the cylinder block and the bearing cap, and the crank journal is provided on the inner peripheral surface of the cylinder block. To lubricate the side roller bearing One oil hole is opened, and the outer race is formed with a through-hole penetrating in a radial direction at a portion facing the first oil hole. A connecting groove extending in the crankshaft direction is formed in the arrangement portion of the crankshaft, and an end face on the crank journal side in the crankshaft direction of the crank arm is formed with a ring-shaped ring groove extending in the circumferential direction, An annular member or an annular member having a plurality of blade portions provided on the engine crankshaft so as to cover the ring groove and supplying oil from the communication groove to the ring groove therebetween. Is attached to the end of the ring groove opposite to the rotational direction of the engine crankshaft for supplying oil to the roller bearing on the crankpin side. One end of the oil hole is open, and the second oil hole passes through the inside of the crank arm and the crank pin, and the other end is open to the outer peripheral surface of the crank pin. is there.

  As a result, oil is ejected from its end through the first oil hole of the cylinder block and the communication groove of the outer race, and the ejected oil is supplied to the ring groove of the crank arm through the blade portion of the annular member. Is done. Then, the oil supplied to the ring groove flows through the ring groove on the opposite side to the rotation direction of the engine crankshaft by the inertial force accompanying the rotation of the engine crankshaft, and is opposite to the rotation direction of the engine crankshaft. To the end of the side. And the oil which reached the end is supplied to the roller bearing on the crankpin side through the crank oil and the second oil hole inside the crankpin. From these facts, it is possible to reliably supply oil to the roller bearing on the crankpin side as compared with the case of supplying oil via the roller bearing end face on the crankpin side as in the prior art.

  In a second aspect based on the first aspect, the blade portion has an inclined surface extending in a direction opposite to the rotation direction of the engine crankshaft as it goes from the crank journal side in the crankshaft direction to the crank arm side. It is characterized by this.

  As a result, the inclined surface of the blade portion extends from the crank journal side in the crankshaft direction to the crank arm side in the opposite direction to the rotation direction of the engine crankshaft. When oil is supplied to the ring groove, the oil can be directed to the ring groove by the inclined surface, and the oil from the communication groove is supplied to the ring groove through the blade portion. The inertial force accompanying rotation can be used effectively. Therefore, it is possible to supply oil more reliably to the roller bearing on the crankpin side.

  According to a third invention, in the first or second invention, the end of the ring groove opposite to the rotational direction of the engine crankshaft and the one end of the second oil hole are It is arranged on the crankpin side with respect to the axis of the crank journal.

  Accordingly, the end of the ring groove opposite to the rotation direction of the engine crankshaft and the one end of the second oil hole are arranged on the crankpin side with respect to the axis of the crank journal in the crankshaft direction view. Therefore, the centrifugal force accompanying the rotation of the engine crankshaft can be effectively used to supply the oil from the ring groove to the outer peripheral surface of the crankpin through the second oil hole. Therefore, it is possible to supply oil more reliably to the roller bearing on the crankpin side.

  In a fourth aspect of the present invention based on any one of the first to third aspects, the annular member further includes a blocking portion that closes an end portion of the ring groove opposite to the rotation direction of the engine crankshaft. It is characterized by.

  As a result, the closed portion of the annular member closes the end of the ring groove opposite to the rotation direction of the engine crankshaft, so the hydraulic pressure at the end of the ring groove opposite to the rotation direction of the engine crankshaft is reduced. Can be maintained at a high level. Therefore, it is possible to supply oil more reliably to the roller bearing on the crankpin side.

  According to a fifth aspect of the present invention, in the second aspect, the end of the ring groove opposite to the rotational direction of the engine crankshaft and the second oil hole are formed on the crank journal shaft as viewed in the crankshaft direction. It is arranged on a line connecting the core and the axis of the crankpin.

  As a result, the end of the ring groove opposite to the rotation direction of the engine crankshaft and the second oil hole are arranged on a line connecting the axis of the crank journal and the axis of the crankpin as viewed in the crankshaft direction. Therefore, the centrifugal force accompanying the rotation of the engine crankshaft can be effectively used to supply the oil from the ring groove to the outer peripheral surface of the crankpin through the second oil hole. Therefore, it is possible to supply oil more reliably to the roller bearing on the crankpin side.

  According to the present invention, the oil is ejected from the end through the first oil hole and the communication groove, and the ejected oil is supplied to the ring groove through between the blade portions, and then supplied to the ring groove. The generated oil flows through the ring groove to the opposite side of the engine crankshaft by the inertial force accompanying the rotation of the engine crankshaft, and reaches the end opposite to the rotation direction of the engine crankshaft. And the oil which reached the end is supplied to the roller bearing on the crankpin side through the second oil hole. From these facts, it is possible to reliably supply oil to the roller bearing on the crankpin side as compared with the case of supplying oil via the roller bearing end face on the crankpin side as in the prior art.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
FIG. 1 is a diagram showing an example in which an engine crankshaft (hereinafter referred to as a crankshaft) lubricating device according to an embodiment of the present invention is applied to an in-line four-cylinder four-cycle engine in which four cylinders are arranged in series. Reference numeral 10 in FIG. 1 denotes a bulk head of the aluminum cylinder block 1, and reference numeral 11 denotes an aluminum bearing cap fastened and fixed to the lower end of the bulk head 10 with a bolt. As shown in FIGS. 1 and 2, semicircular bearing holes 12 and 13 are formed in the lower end portion of the bulkhead 10 and the upper end portion of the bearing cap 11, respectively. The crank journal 20 of the crankshaft 2 is rotatably supported via an iron roller bearing 3. The roller bearing 3 is provided between the outer race 31 and the crank journal 20 and a half annular outer race 31 fixed to the inner peripheral surfaces of the bearing holes 12 and 13 by a rotation-preventing pin 30 so as not to rotate. A plurality of needle rollers 32, 32,..., And a half ring that holds the needle rollers 32, 32,. It consists of a holder 33. The holder 33 rotates in the bearing holes 12 and 13 in accordance with the rolling of the needle roller 32.

  The outer race 31 is interposed between the bulkhead 10 and the bearing cap 11 and the needle roller 32. Without the outer race 31, the iron needle roller 32 having a high hardness directly has an aluminum bulk having a low hardness. This is because they rotate on the head 10 and the bearing cap 11 and are damaged.

  Inside the bulkhead 10, a linear first oil hole 10a is formed with one end opened to the inner peripheral surface of the bearing hole 12 of the bulkhead 10 and the other end connected to the oil gallery 1a. The oil gallery 1a is in the vicinity of the lower end of the cylinder 14 inside the cylinder block 1 and on one side (right side in FIG. 2) of the direction orthogonal to the crankshaft direction (hereinafter referred to as the crankshaft orthogonal direction). It is formed to extend. A through hole 31 a that penetrates in the radial direction (thickness direction) is formed in a portion of the outer race 31 that faces one end of the first oil hole 10 a. When the crankshaft 2 rotates, oil from the oil gallery 1a is supplied to the roller bearing 3 on the crank journal 20 side through the first oil hole 10a and the through hole 31a.

  The crank journals 20 at both ends in the crankshaft direction are rotatably supported via roller bearings 3 in bearing holes respectively formed in the front wall (or rear wall) of the cylinder block 1 and the bearing cap 11. Yes. An oil hole 10a for supplying oil to the roller bearing 3 is formed in the front wall (or rear wall).

  As shown in FIGS. 1 and 3, a crank pin 22 connected to the crank journal 20 via a crank arm 21 rotatably supports the large end 4 a of the iron connecting rod 4. The connecting rod 4 has a connecting rod main body 40 and a cap 42 fastened and fixed to the lower end of the connecting rod main body 40 by a bolt 41, and a piston whose small end (not shown) reciprocates in the cylinder 14. 15 is connected. Semi-circular bearing holes 4 b and 4 c are formed in the lower end portion of the connecting rod body 40 and the upper end portion of the cap 42, and the bearing holes 4 b and 4 c are made of iron between the crank pin 22. A roller bearing 5 is interposed. The roller bearing 5 includes a plurality of needle rollers 50, 50,... Provided between the connecting rod 4 and the crank journal 20, and these needle rollers 50, 50,. It consists of a half-shaped annular holder 51 that is held open so that it can roll in the circumferential direction. The holder 51 rotates in the bearing holes 4b and 4c according to the rolling of the needle roller 50.

  In the following description, the five crank journals 20 are first to fifth crank journals 20a to 20e in order from the left side in FIG. 1, and the eight crank arms 21 are first to eighth crank arms 21a to 21h in order from the left side. The four crank pins 22 are called first to fourth crank pins 22a to 22d in order from the left side.

  As shown in FIGS. 1, 4, and 5, the outer race 31 of the roller bearing 3 in the second and fourth crank journals 20 b and 20 d has an outer surface extending in the crankshaft direction in the portion where the through hole 31 a is disposed. Linear connecting grooves 31b are formed on both end faces of the race 31 in the crankshaft direction, and open in the straight direction. The communication groove 31b is configured to constantly eject oil from both ends thereof.

As shown in FIGS. 1 and 4 to 6, the outer race 31 is provided on the end surface of the second, third, sixth, and seventh crank arms 21 b, 21 c, 21 f, 21 g on the crank journal 20 side in the crankshaft direction. Close-circular ring grooves 23 extending in the circumferential direction are formed on the sides. An end portion (hereinafter referred to as an end portion) 23a opposite to the rotation direction of the crankshaft 2 in the ring groove 23 is formed on the axis _AJ of the crank journal 20 as the rotation center of the crankshaft 2 as viewed in the crankshaft direction. On the other hand, it is arranged on the crankpin 22 side. The end of the ring groove 23 on the rotation direction side of the crankshaft 2, that is, the start end is also disposed on the crankpin 22 side with respect to the axis _AJ of the crank journal 20 as viewed in the crankshaft direction.

  As shown in FIGS. 1, 4, 5, and 7, the end surfaces of the second, third, sixth, and seventh crank arms 21 b, 21 c, 21 f, and 21 g on the crank journal 20 side in the crankshaft direction are An annular member 6 having a plurality of plate-like blade portions 60, 60,... Provided in parallel with each other at a predetermined interval so as to cover the ring grooves 23 is fixed with screws. . The annular member 6 is disposed between the crank arm 21 and the outer race 31 with a gap from the outer race 31. The blade portion 60 has an inclined surface 60a extending in a linearly inclined manner on the opposite side to the rotation direction of the crankshaft 2 from the crank journal 20 (outer race 31) side in the crankshaft direction to the crank arm 21 side. Yes. In FIG. 4, a part of the annular member 6 is omitted to illustrate the ring groove 23.

  The annular member 6 includes, in addition to the plurality of blade portions 60, 60,..., An annular bottom plate portion 61 that connects ends of the plurality of blade portions 60, 60,. A plurality of blade portions 60, 60,... Further includes an annular top plate portion 62 that connects ends on the outer sides in the direction perpendicular to the crankshaft, and a closing portion 63 that closes the end portion 23a of the ring groove 23. . The bottom plate portion 61 overlaps the outer race 31 when viewed in the crankshaft direction. The oil passages defined by the adjacent blade portions 60, 60, the bottom plate portion 61, and the top plate portion 62 are respectively connected to the opening end of the communication groove 31b when the opening on the outer race 31 side rotates the crankshaft 2. The opening on the crank arm 21 side faces the ring groove 23.

As shown in FIGS. 4 and 6 to 8, one end of the second oil hole 24 is opened at the terminal portion 23 a of the ring groove 23. One end, that is, the opening of the second oil hole 24 on the crank arm 21 (ring groove 23) side is disposed closer to the crankpin 22 with respect to the axis _AJ of the crank journal 20 as viewed in the crankshaft direction.

The second oil hole 24 passes through the inside of the crank arm 21 and the crank pin 22, and the other end opens to the outer peripheral surface of the crank pin 22. Specifically, the second oil hole 24, the crank arm adjacent phase and its crank arm 21 extends in a straight line through the axis A _P of the crank pin 22 from the end portion 23a of the ring groove 23 of the crank arm 21 a first hole 24a which opens to the surface of the crankshaft direction of the crank journal 20 side in 21, and extends linearly toward the crankshaft center in the direction of the outer peripheral surface of the crank pin 22 the axis a _P of the crank pin 22 A second hole portion 24b communicating with the first hole portion 24a is provided. These first and second holes 24a and 24b are each drilled with a drill for drilling (not shown). The opening on the side of the crank arm 21 adjacent to each other in the first hole portion 24a is closed by, for example, a plug 7 being inserted. In FIG. 3, the second oil hole 24 is not shown.

  Hereinafter, the oil supply to the roller bearing 5 on the crankpin 22 side when the crankshaft 2 rotates will be described with reference to FIGS. First, oil from the oil gallery 1a is ejected from both ends through the first oil hole 10a and the communication groove 31b. The oil that has jumped out is supplied to the ring groove 23 through the space between adjacent blade portions 60 and 60 of the annular member 6 that rotates as the crankshaft 2 rotates. Here, since the inclined surface 60 a of the blade 60 is inclined to the opposite side to the rotation direction of the crankshaft 2 as it is away from the outer race 31, when the oil is supplied to the ring groove 23 between the blade portions 60, 60. The oil ejected from the communication groove 31b can be moved while being pushed to the ring groove 23 side by the inclined surface 60a, and the oil is supplied to the ring groove 23 between the blade portions 60, 60. The inertial force accompanying rotation can be used effectively.

  Then, the oil received in the ring groove 23 flows through the ring groove 23 to the opposite side to the rotation direction of the crankshaft 2 by the flow force and the inertial force accompanying the rotation of the crankshaft 2, and the terminal portion thereof. 23a is reached. Here, since the end portion 23a is covered with the closing portion 63, the oil pressure of the oil reaching the end portion 23a is kept at a high level.

  The oil that has reached the end portion 23 a is supplied to the roller bearing 5 on the crank pin 22 side through the second oil hole 24 by virtue of the flow force and the centrifugal force accompanying the rotation of the crankshaft 2. .

-Effect-
As described above, according to the present embodiment, oil is ejected from the end of the bulkhead 10 through the first oil hole 10 a and the communication groove 31 b of the outer race 31, and the ejected oil is the blade of the annular member 6. It is supplied to the ring groove 23 of the crank arm 21 through the space between the portions 60, 60. Then, the oil supplied to the ring groove 23 flows through the ring groove 23 on the opposite side to the rotation direction of the crankshaft 2 by the inertial force accompanying the rotation of the crankshaft 2 and reaches the end portion 23a. Then, the oil that has reached the end portion 23 a is supplied to the roller bearing 5 on the crank pin 22 side via the second oil hole 24 inside the crank arm 21 and the crank pin 22. From these facts, it is possible to reliably supply oil to the roller bearing 5 on the crankpin 22 side as compared with the case of supplying oil via the roller bearing end face on the crankpin side as in the prior art.

  Further, since the inclined surface 60a of the blade portion 60 extends from the crank journal 20 side in the crankshaft direction to the crank arm 21 side in the opposite direction to the rotation direction of the crankshaft 2, the space between the blade portions 60 and 60 is increased. When the oil from the communication groove 31b is supplied to the ring groove 23 through the oil, the oil can be directed to the ring groove 23 by the inclined surface 60a and from the communication groove 31b through the blade portions 60 and 60. In order to supply oil to the ring groove 23, the inertial force accompanying the rotation of the crankshaft 2 can be used effectively. Therefore, it is possible to supply the roller bearing 5 on the crankpin 22 side more reliably.

Further, since the end portion 23a of the ring groove 23 and one end of the second oil hole 24 are disposed on the crank pin 22 side with respect to the axis _AJ of the crank journal 20 as viewed in the crankshaft direction, the second oil In order to supply the oil from the ring groove 23 to the outer peripheral surface of the crank pin 22 through the hole 24, the centrifugal force accompanying the rotation of the crankshaft 2 can be used effectively. Therefore, it is possible to supply the roller bearing 5 on the crankpin 22 side more reliably.

  Further, since the closing portion 63 of the annular member 6 closes the end portion 23a of the ring groove 23, the hydraulic pressure of the end portion 23a of the ring groove 23 can be maintained at a high level. Therefore, it is possible to supply the roller bearing 5 on the crankpin 22 side more reliably.

(Other embodiments)
In the said embodiment, although the terminal part 23a of the ring groove 23 and the 2nd oil hole 24 are arrange | positioned as mentioned above, it is not restricted to this, For example, the terminal part 23a of the ring groove 23 and the 2nd oil hole 24, as shown in FIG. 9 may be disposed on the line L connecting the axis a _P of the axis a _J and the crank pin 22 of the crank journal 20 in the crankshaft direction as viewed. That is, the first hole portion 24a is a crank in the crank arm 21 adjacent linearly extends through the axis A _P of crankpin 22 from the end portion 23a of the ring groove 23 of the crank arm 21 and its crank arm 21 phase An opening is formed on the surface of the crank journal 20 in the axial direction. On the other hand, the second hole portion 24b communicates with the first hole portion 24a extends linearly from the crankshaft center in the direction of the outer peripheral surface of the crank pin 22 to the axis A _P of the crank pin 22. In this case, the end portion 23a of the ring groove 23 and the second oil hole 24 are disposed on a line L connecting the axis of the crank journal 20 and the axis of the crank pin 22 as viewed in the crankshaft direction. In order to supply the oil from the ring groove 23 to the outer peripheral surface of the crank pin 22 through the second oil hole 24, the centrifugal force accompanying the rotation of the crankshaft 2 can be effectively used. Therefore, it is possible to supply the roller bearing 5 on the crankpin 22 side more reliably.

  In the above embodiment, the closing portion 63 is provided on the annular member 6, but instead, blade portions 60, 60,... May be provided as shown in FIG. However, the former is desirable for reliably supplying oil to the roller bearing 5 on the crankpin 22 side.

  In the said embodiment, although the annular member 6 is made into the annular | circular shape, it is good also as a missing annular shape.

  In the above embodiment, oil from the second crank journal 20b is supplied to the first and second crank pins 22a and 22b, and oil from the fourth crank journal 20d is supplied to the third and fourth crank pins 22c and 22d. However, it is not limited to this. For example, the arrangement of the communication groove 31b, the ring groove 23, and the annular member 6 is changed to supply oil from the first to fourth crank journals 20a to 20d to the first to fourth crank pins 22a to 22d, respectively. It may be.

  The present invention is not limited to the embodiments, and can be implemented in various other forms without departing from the spirit or main features thereof.

  As described above, the above-described embodiment is merely an example in all respects and should not be interpreted in a limited manner. The scope of the present invention is defined by the claims, and is not limited by the specification. Further, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

  As described above, the engine crankshaft lubrication device according to the present invention can be applied to applications such as reliably supplying oil to the roller bearing on the crankpin side.

It is a fragmentary sectional view of the cylinder block concerning the embodiment of the present invention. It is the II-II sectional view taken on the line of FIG. It is sectional drawing of a crankpin, a connecting rod, and a roller bearing. It is a perspective view of an outer race, an annular member, and a crank arm. It is a figure explaining the flow of oil. FIG. 8 is a view corresponding to FIG. It is a VII-VII line partial sectional view of Drawing 1. It is sectional drawing of a crankshaft. It is a figure explaining arrangement | positioning of a 2nd oil hole, (a) is the figure which looked at the crankshaft from the crankshaft direction, (b) is sectional drawing of a crankshaft. FIG. 8 is a view corresponding to FIG. 7 showing a modification.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cylinder block 10 Bulk head 10a 1st oil hole 11 Bearing cap 12, 13 Bearing hole 2 Engine crankshaft 20 Crank journal 21 Crank arm 22 Crank pin 23 Ring groove 23a End part (End on the opposite side to the rotation direction of a crankshaft) Part)
24 Second oil hole 3 Roller bearing 31 Outer race 31a Through hole 31b Connecting groove 4 Connecting rod 5 Roller bearing 6 Annular member 60 Blade part 63 Closure part

Claims (5)

An engine crankshaft comprising: a crank journal supported by a cylinder block and a bearing cap; a crank pin that supports a connecting rod body and a large end of a connecting rod having a cap; and a crank arm that connects the crank journal and the crank pin. A lubrication device,
Roller bearings are provided between the cylinder block and the bearing cap and the crank journal, and between the connecting rod and the crank pin, respectively.
The crank journal roller bearing has an outer race that is non-rotatably provided on the inner peripheral surface of the bearing hole of the cylinder block and the bearing cap,
A first oil hole for supplying oil to the roller bearing on the crank journal side is opened on the inner peripheral surface of the bearing hole of the cylinder block,
In the outer race, a through hole penetrating in the radial direction is formed in a portion facing the first oil hole,
On the outer peripheral surface of the outer race, a communication groove extending in the crankshaft direction is formed in the arrangement portion of the through hole,
On the end surface of the crank arm in the crankshaft direction on the side of the crank journal, a ring-shaped ring groove extending in the circumferential direction is formed.
An annular member or an annular member having a plurality of blade portions provided on the engine crankshaft so as to cover the ring groove and supplying oil from the communication groove to the ring groove therebetween. Is attached,
One end of a second oil hole for supplying oil to the roller bearing on the crankpin side is opened at the end of the ring groove opposite to the rotation direction of the engine crankshaft,
The engine crankshaft lubrication device, wherein the second oil hole passes through the inside of the crank arm and the crank pin, and the other end opens to the outer peripheral surface of the crank pin. The engine crankshaft lubrication device according to claim 1,
The engine crankshaft lubrication device according to claim 1, wherein the blade portion has a slope extending in a direction opposite to the rotation direction of the engine crankshaft as the crankshaft direction extends from the crank journal side to the crank arm side. The engine crankshaft lubrication device according to claim 1 or 2,
An end of the ring groove opposite to the rotation direction of the engine crankshaft and one end of the second oil hole are disposed on the crankpin side with respect to the axis of the crank journal as viewed in the crankshaft direction. An engine crankshaft lubrication device characterized by that. The engine crankshaft lubrication device according to any one of claims 1 to 3,
The said annular member has further the obstruction | occlusion part which block | closes the edge part on the opposite side to the rotation direction of the said engine crankshaft in the said ring groove, The engine crankshaft lubrication apparatus characterized by the above-mentioned. The engine crankshaft lubrication device according to claim 3,
The end of the ring groove opposite to the rotation direction of the engine crankshaft and the second oil hole are on a line connecting the axis of the crank journal and the axis of the crankpin as viewed in the crankshaft direction. An engine crankshaft lubrication device characterized by being arranged.

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