JP2015175300A - Lubricant supply mechanism of engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lubricant supply mechanism of an engine capable of preventing a lubricant from being excessively supplied to a prescribed lubricating portion without machining a shaft.SOLUTION: In a lubricant supply mechanism of an engine including a lubricant passage 50 for circulating a lubricant and supplying the lubricant circulated in the lubricant passage 50 to a prescribed lubricating portion, the lubricant passage 50 includes a flat oil passage 55 defined by an outer peripheral face of an exhaust-side cam shaft 34 and an inner peripheral face of a cam cap-side bearing portion 41 rotatably supporting the exhaust-side cam shaft 34. The flat oil passage 55 is constituted so that the lubricant cannot be circulated in a state that the exhaust-side cam shaft 34 is not rotated, and the lubricant can be circulated in a state that the exhaust-side cam shaft 34 is rotated, in accompany with the rotation.

Description

  The present invention relates to a technique for a lubricating oil supply mechanism of an engine that includes a lubricating oil passage through which lubricating oil flows and supplies the lubricating oil that has passed through the lubricating oil passage to a predetermined lubricating portion.

  2. Description of the Related Art Conventionally, a technique of a lubricating oil supply mechanism for an engine that includes a lubricating oil passage through which lubricating oil flows and supplies the lubricating oil that has passed through the lubricating oil passage to a predetermined lubricating portion has been publicly known. For example, as described in Patent Document 1.

  Patent Document 1 discloses a technology that includes a lubricating oil passage through which lubricating oil flows and supplies the lubricating oil that has passed through the lubricating oil passage to a cam (predetermined lubricating portion) of a camshaft. In the above technique, a part of the lubricating oil passage is formed by connecting oil passages provided in the cylinder head, the camshaft, and the cam cap, respectively.

  According to such a configuration, communication between the oil passage provided in the camshaft and the oil passage provided in each of the cylinder head and the cam cap is intermittently performed according to the rotation of the camshaft. Thus, in the above technique, the lubricating oil can be intermittently supplied to the cam of the camshaft to prevent excessive supply of the lubricating oil.

  However, the oil passage provided in the camshaft in the above technique is formed by drilling (processing) a through-hole that communicates with the outer peripheral surface of the camshaft. Therefore, when the camshaft cannot be processed, for example, when the camshaft is a hollow member, an oil passage cannot be provided in the camshaft.

JP 2010-164209 A

  The present invention has been made in view of the above situation, and the problem to be solved is to prevent excessive supply of lubricating oil to a predetermined lubricating portion without processing the shaft. It is an object to provide a lubricating oil supply mechanism for an engine capable of achieving the above.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

  That is, according to the first aspect of the present invention, there is provided a lubricating oil supply mechanism for an engine that includes a lubricating oil passage through which lubricating oil flows and supplies the lubricating oil that has passed through the lubricating oil passage to a predetermined lubricating portion. The oil passage includes a partition oil passage partitioned by an outer peripheral surface of the shaft and an inner peripheral surface of the bearing portion that rotatably supports the shaft, and the partition oil passage is in a state where the shaft is not rotating. Thus, the lubricating oil is configured not to flow, and the lubricating oil is configured to flow along with the rotation while the shaft is rotating.

  In Claim 2, the quantity of the lubricating oil which distribute | circulates the said division oil path is adjusted according to the rotational speed of the said shaft.

  According to a third aspect of the present invention, the partition oil passage is formed using a clearance between the shaft and the bearing portion.

  According to a fourth aspect of the present invention, the shaft is a camshaft of the engine.

  As effects of the present invention, the following effects can be obtained.

  According to the first aspect, it is possible to prevent the lubricating oil from being excessively supplied to the predetermined lubricating portion without processing the shaft.

  According to the second aspect, an appropriate amount of lubricating oil can be supplied to a predetermined lubricating portion.

  In claim 3, the partition oil passage can be provided with a simple configuration.

  According to the fourth aspect of the present invention, the partition oil passage can be provided with a simple configuration using the clearance between the camshaft and the bearing portion.

Sectional drawing in the cylinder head cover of the engine which concerns on one Embodiment of this invention. The top view which shows a cam cap and an oil supply member. (A) AA sectional drawing in FIG. (B) Similarly, a partially enlarged view. Sectional drawing which shows a mode that lubricating oil is supplied to a lubrication part from an oil supply member. (A) The figure which shows the flow of lubricating oil in the state immediately after the exhaust side camshaft starts rotation. (B) The figure which similarly shows the lubricating oil which distribute | circulates a lubricating oil path. (A) The figure which shows the flow of lubricating oil in the state which the exhaust side camshaft continued rotation from the state shown in FIG. (B) The figure which similarly shows the lubricating oil which distribute | circulates a lubricating oil path. (A) The figure which shows the flow of lubricating oil in the state which the exhaust side camshaft continued rotation from the state shown in FIG. (B) The figure which similarly shows the lubricating oil which distribute | circulates a lubricating oil path. (A) The figure which shows the flow of lubricating oil in the state which the exhaust side camshaft continued rotation from the state shown in FIG. (B) The figure which similarly shows the lubricating oil which distribute | circulates a lubricating oil path. (A) The figure which shows the flow of lubricating oil in the state which the exhaust side camshaft stopped rotation from the state shown in FIG. (B) The figure which similarly shows the lubricating oil which distribute | circulates a lubricating oil path. (A) The figure which shows the flat oil path in 2nd embodiment. (B) The figure which shows the flat oil path in 3rd embodiment. (C) BB sectional drawing in FIG.10 (b).

  Below, according to the arrow shown in the figure, the up-down direction, the left-right direction, and the front-back direction are defined.

  First, the configuration of an engine 1 including a lubricating oil supply mechanism according to an embodiment of the present invention will be described using FIGS. 1 to 4.

In the engine 1, an intake side structure for opening and closing the intake valve 131 and an exhaust side structure for opening and closing the exhaust valve 31 are configured in the same manner. Therefore, in the following, the structure for opening and closing the intake / exhaust valves 131 and 31 will be described mainly with respect to the exhaust side structure (structure shown on the right side in FIG. 1), and the intake side structure (shown on the left side in FIG. 1). The description of the structure to be omitted will be omitted.
The exhaust side structure will be described with particular attention to the location where the second cam cap 40 from the front of the four cam caps 40 to be described later is disposed (see FIG. 2).

  The engine 1 according to this embodiment is a DOHC gasoline engine with an in-line four-cylinder 16 valve. The engine 1 mainly includes a cylinder head 10, a cylinder head cover 20, a valve mechanism 30, a cam cap 40, a lubricating oil passage 50, and an oil supply member 60.

  A cylinder head 10 shown in FIGS. 1, 3 and 4 is a main structure of the engine 1 together with a cylinder block (not shown). The cylinder head 10 is fixed to the upper part of the cylinder block. The cylinder head 10 mainly includes a cylinder head side bearing portion 11, an oil gallery 12, an upstream side oil passage 51, and a cylinder head side bearing oil passage 53.

  The cylinder head side bearing portion 11 shown in FIGS. 1 and 3 supports an exhaust side camshaft 34 described later so as to be rotatable from below. The cylinder head side bearing portion 11 is formed on the right portion of the cylinder head 10 so as to be a semicircular concave portion opened upward in a front view.

  The oil gallery 12 shown in FIGS. 1, 3 and 4 is used to supply lubricating oil to each part of the engine 1 (for example, a lubricating part of the engine 1 and hydraulic equipment such as lash adjusters 33 and 33 described later). It is an oil passage. The oil gallery 12 is formed so as to pass in the vicinity of the right side wall of the cylinder head 10 in the front-rear direction.

The upstream oil passage 51 and the cylinder head side bearing oil passage 53 shown in FIG. 3 are respectively included in a lubricating oil passage 50 described later.
The upstream side oil passage 51 and the cylinder head side bearing oil passage 53 will be described later.

  A cylinder head cover 20 shown in FIG. 1 covers the upper part of the cylinder head 10. The cylinder head cover 20 is placed on top of the cylinder head 10 and is appropriately fixed with bolts or the like.

  A valve mechanism 30 shown in FIGS. 1 and 4 is for opening and closing an exhaust port (not shown) of the engine 1 at a predetermined timing. The valve operating mechanism 30 mainly includes an exhaust valve 31, rocker arms 32 and 32, lash adjusters 33 and 33, and an exhaust side camshaft 34.

  The exhaust valve 31 shown in FIGS. 1 and 4 opens and closes an exhaust port (not shown) of the engine 1. The exhaust valve 31 is arranged with its longitudinal direction substantially in the vertical direction. The lower end of the exhaust valve 31 extends to the exhaust port. The middle part of the exhaust valve 31 is slidably inserted into the cylinder head 10.

  Although not shown in the present embodiment, two exhaust valves 31 are provided side by side in the front-rear direction for one cylinder.

  The rocker arms 32 and 32 shown in FIGS. 1 and 4 are for opening and closing the exhaust valve 31. One end of each of the rocker arms 32 and 32 is brought into contact with the upper end of the exhaust valve 31 from above. The rocker arms 32 and 32 are respectively provided with rollers 35 and 35 that are rotatable about an axis line in the front-rear direction.

  The lash adjusters 33 and 33 shown in FIGS. 1 and 4 are for adjusting the valve clearance. The lash adjusters 33 and 33 are brought into contact with the other ends of the rocker arms 32 and 32 from below.

  The exhaust side camshaft 34 shown in FIGS. 1 to 4 is for opening and closing the exhaust valve 31 by swinging the rocker arm 32 at a predetermined timing. The exhaust side camshaft 34 is placed on the cylinder head side bearing portion 11 of the cylinder head 10 with its longitudinal direction directed in the front-rear direction. The exhaust side camshaft 34 mainly includes cams 36 and 36.

  The cams 36 shown in FIGS. 1, 2, and 4 are portions formed in a plate shape in which the distance from the rotation center (the center of the exhaust side camshaft 34) to the outer periphery is not constant. The cams 36 are arranged at positions corresponding to the respective cylinders in the front-rear direction. The cams 36 and 36 are brought into contact with the rollers 35 and 35 of the rocker arms 32 and 32 from above.

The cam cap 40 shown in FIGS. 1 to 4 is fixed to the upper portion of the cylinder head 10 and holds the exhaust-side camshaft 34 with the cylinder head 10. The cam cap 40 is formed in a substantially rectangular parallelepiped shape with the longitudinal direction facing the left-right direction. As shown in FIG. 2, in the present embodiment, four cam caps 40 are provided, and are respectively disposed at positions at the rear of each cylinder in the front-rear direction.
The cam cap 40 mainly includes a cam cap side bearing portion 41, a mounting portion 42, a bolt hole 43, a cam cap side bearing oil passage 54, a flat oil passage 55, and a downstream oil passage 56.

  The cam cap side bearing portion 41 shown in FIGS. 1 and 3 supports the exhaust side cam shaft 34 so as to be rotatable from above. The cam cap side bearing portion 41 is formed on the right portion of the cam cap 40 so as to be a semicircular concave portion whose lower portion is opened in a front view. The cam cap side bearing portion 41 is disposed at a position facing the cylinder head side bearing portion 11 of the cylinder head 10. An exhaust side camshaft 34 is rotatably supported between the cam cap side bearing portion 41 and the cylinder head side bearing portion 11.

  The mounting portion 42 shown in FIGS. 1 to 4 is formed on the right portion of the upper surface of the cam cap 40 (right side of the cam cap side bearing portion 41 in the left-right direction). The mounting portion 42 is formed so as to be recessed by a predetermined depth below its periphery, and open upward, forward and rearward.

  A bolt hole 43 shown in FIG. 3 is for inserting a bolt 44 to fix the cam cap 40 to the cylinder head 10. The bolt hole 43 is formed so as to penetrate from the right portion of the bottom surface of the mounting portion 42 to the lower surface of the cam cap 40.

The cam cap side bearing oil passage 54, the flat oil passage 55, and the downstream oil passage 56 shown in FIG. 3 are respectively included in a lubricating oil passage 50 described later.
The cam cap side bearing oil passage 54, the flat oil passage 55, and the downstream oil passage 56 will be described later.

  In the present embodiment, the cylinder head 10 and the cam cap 40 configured as described above constitute a cam housing that rotatably supports the exhaust side camshaft 34 of the valve mechanism 30. Although not described in detail, the cam housing also supports the intake side camshaft 134 of the valve mechanism 30 so as to be rotatable with the same configuration (see FIG. 1 and the like).

A lubricating oil passage 50 shown in FIG. 3 is an oil passage through which lubricating oil flows. The lubricating oil passage 50 supplies the lubricating oil of the oil gallery 12 of the cylinder head 10 to the oil supply member 60. The lubricating oil passage 50 is formed as a single oil passage by connecting a plurality of oil passages to each other. One end (upstream end) of the lubricating oil passage 50 is in communication with the oil gallery 12, and the other end (downstream end) of the lubricating oil passage 50 is in communication with the oil supply member 60.
A detailed description of the lubricating oil passage 50 will be described later.

  The oil supply member 60 shown in FIGS. 1 to 4 is a member for supplying the lubricating oil supplied from the lubricating oil passage 50 to a predetermined lubricating portion. In the present embodiment, the cams 36 and 36 of the exhaust side camshaft 34 are set as the predetermined lubricating portion. The oil supply member 60 is formed in one elongated flat plate shape by joining two elongated flat plate members. The oil supply member 60 is placed on the mounting portion 42 of the cam cap 40 with the longitudinal direction as the front-rear direction, and is fixed by the bolts 44.

  Inside the oil supply member 60, as shown in FIGS. 2 and 3, an inner oil passage 61 through which lubricating oil flows is formed. The inner oil passage 61 extends along the longitudinal direction of the oil supply member 60. A discharge port 62 for supplying (dropping) lubricating oil to the cams 36 and 36 of the exhaust side camshaft 34 is formed in the inner oil passage 61 (see FIG. 4). A plurality of discharge ports 62 are provided and are disposed above the cams 36 and 36 of the corresponding exhaust side camshaft 34 (to be lubricated). As shown in FIG. 3, the inner oil passage 61 is formed with an inlet 63 for allowing the lubricating oil to flow into the inner oil passage 61 from the outside of the oil supply member 60.

  In the engine 1 including the lubricating oil supply mechanism configured as described above, the lubricating oil in the oil gallery 12 flows through the lubricating oil passage 50 and is supplied to the oil supply member 60. As shown in FIG. 4, the lubricating oil supplied to the oil supply member 60 flows into the inner oil passage 61 via the inflow port 63, flows through the inner oil passage 61, and then passes through the discharge port 62. It is dropped from above onto the cams 36 of the exhaust side camshaft 34. Thus, in the engine 1, the lubricating oil flowing through the lubricating oil passage 50 can be supplied to the cams 36 and 36 (predetermined lubricating portions) of the exhaust side camshaft 34.

  Below, the structure of the lubricating oil path 50 is demonstrated in detail using FIG.

  The lubricating oil passage 50 is formed as a single oil passage by connecting a plurality of oil passages to each other. Specifically, the lubricating oil passage 50 includes an upstream oil passage 51, a bearing oil passage portion 52 (cylinder head side bearing oil passage 53 and cam cap side bearing oil passage 54), a flat oil passage 55, and a downstream oil passage 56. Are communicated with each other and formed as one oil passage as a whole.

  The upstream oil passage 51 is a hole formed in the right part of the cylinder head 10. The upstream oil passage 51 supplies lubricating oil from the oil gallery 12 to the bearing oil passage portion 52. One end (upstream end) of the upstream oil passage 51 communicates with the oil gallery 12, and the other end of the upstream oil passage 51 communicates with one end (downstream end) of the bearing oil passage portion 52. The upstream oil passage 51 extends linearly from the oil gallery 12 to the cylinder head side bearing oil passage 53 toward the upper left in a front view.

  The bearing oil passage portion 52 includes a cylinder head side bearing oil passage 53 and a cam cap side bearing oil passage 54.

  The cylinder head side bearing oil passage 53 is formed by denting the right end portion of the cylinder head side bearing portion 11 and the vicinity thereof in the outer diameter direction. The upper end portion of the cylinder head side bearing oil passage 53 is opened from the upper surface of the cylinder head 10. The cylinder head side bearing oil passage 53 is formed between the exhaust side camshaft 34 as a space extending in the circumferential direction when viewed from the front.

  The cam cap side bearing oil passage 54 is formed by a portion extending from the right end portion to the central left side portion of the cam cap side bearing portion 41 being recessed in the outer diameter direction. The lower end portion of the cam cap side bearing oil passage 54 is opened from the lower surface of the cam cap 40. The cam cap side bearing oil passage 54 is formed between the exhaust side cam shaft 34 and a space extending in the circumferential direction when viewed from the front. The lower end portion of the cam cap side bearing oil passage 54 is formed to face the upper end portion of the cylinder head side bearing oil passage 53.

  With such a configuration of the cylinder head side bearing oil passage 53 and the cam cap side bearing oil passage 54, when the cam housing is formed, it straddles the fixing surface of the cylinder head 10 and the cam cap 40 in the circumferential direction when viewed from the front. An extending space is formed adjacent to the exhaust side camshaft 34. The formed space becomes the “bearing oil passage 52”.

  The bearing oil passage 52 supplies the lubricating oil from the upstream oil passage 51 to the flat oil passage 55. One end (upstream end) of the bearing oil passage portion 52, more specifically, the vicinity of the lower end portion of the cylinder head side bearing oil passage 53 is communicated with the other end (downstream end) of the upstream oil passage 51. Further, the other end (downstream end) of the bearing oil passage portion 52, more specifically, the vicinity of the upper end portion of the cam cap side bearing oil passage 54 is communicated with one end (upstream end) of the flat oil passage 55.

  The flat oil passage 55 is a clearance between the exhaust side camshaft 34 and the cam cap side bearing portion 41 (more specifically, the clearance between the bearing oil passage portion 52 and the downstream oil passage 56 in the front view of the clearance). It is an oil passage formed using a clearance interposed therebetween. That is, the flat oil passage 55 is formed as a space between the outer peripheral surface of the exhaust side camshaft 34 and the inner peripheral surface of the cam cap side bearing portion 41. The radial width W1 of the flat oil passage 55 is such that when the cam housing is formed, the exhaust-side camshaft 34 is rotatable, and the lubricating oil does not easily flow through the flat oil passage 55. The width is formed. In the present embodiment, the radial width W1 of the flat oil passage 55 is set to be the same as the radial width of other portions of the clearance (see FIG. 3).

  The flat oil passage 55 supplies the lubricating oil from the bearing oil passage portion 52 to the downstream oil passage 56. One end (upstream end) of the flat oil passage 55 communicates with the other end (downstream end) of the bearing oil passage portion 52, that is, in the vicinity of the upper end portion of the cam cap side bearing oil passage 54. Further, the other end (downstream end) of the flat oil passage 55 communicates with one end (upstream end) of the downstream oil passage 56.

  The downstream oil passage 56 is a hole formed in the right part of the cam cap 40. The downstream oil passage 56 supplies the lubricating oil from the flat oil passage 55 to the oil supply member 60. One end (upstream end) of the downstream oil passage 56 is connected to a clearance between the exhaust camshaft 34 and the cam cap side bearing portion 41 and communicated with the other end (downstream end) of the flat oil passage 55. Further, the other end (downstream end) of the downstream oil passage 56 is opened from the upper side surface of the attachment portion 42. Thus, when the oil supply member 60 is fixed to the mounting portion 42 of the cam cap 40, the other end (downstream end) of the downstream oil passage 56 is communicated with the inner oil passage 61 of the oil supply member 60 via the inflow port 63. The The downstream-side oil passage 56 extends linearly from the downstream end to the upstream end in the front view and toward the upper left.

  In the lubricating oil passage 50 configured as described above, the upstream oil passage 51, the bearing oil passage portion 52 (the cylinder head side bearing oil passage 53 and the cam cap side bearing oil passage 54), the flat oil passage 55, and the downstream oil. The passages 56 communicate with each other and are formed as a single oil passage as a whole.

  Below, the aspect of distribution | circulation of the lubricating oil in the lubricating oil path 50 is demonstrated using FIGS.

  In addition, in the following drawings, the black broken-line arrow shall show the flow of lubricating oil.

  5A and 5B show a state immediately after the exhaust camshaft 34 starts rotating. In the present embodiment, it is assumed that the exhaust camshaft 34 rotates counterclockwise when viewed from the front.

  As shown in FIG. 5A, the lubricating oil in the oil gallery 12 flows into the upstream oil passage 51. The lubricating oil that has flowed into the upstream oil passage 51 flows through the upstream oil passage 51 toward the upper left in a front view. The lubricating oil that has flowed through the upstream oil passage 51 flows into the bearing oil passage portion 52 (more specifically, the cylinder head side bearing oil passage 53). The lubricating oil that has flowed into the cylinder head side bearing oil passage 53 of the bearing oil passage portion 52 flows from the cylinder head side bearing oil passage 53 into the cam cap side bearing oil passage 54.

  Here, the radial width W1 of the flat oil passage 55 is formed to such a width that lubricating oil does not easily flow through the flat oil passage 55 as described above (see FIG. 3B). In the present embodiment, the “width that does not allow the lubricating oil to easily flow through the flat oil passage 55” means that the lubricating oil cannot flow when the exhaust camshaft 34 is not rotating, and the exhaust side It is assumed that the width is such that the lubricating oil can flow along with the rotation while the camshaft 34 is rotating. The width can be obtained in advance by experiments, numerical analysis, or the like.

  Thus, in a state immediately after the exhaust camshaft 34 starts to rotate, even if the lubricating oil flows through the bearing oil passage 52, the lubricating oil does not immediately flow into the flat oil passage 55. That is, in the state immediately after the exhaust camshaft 34 starts to rotate, the lubricating oil that has flowed into the bearing oil passage 52 is filled in the bearing oil passage 52 as shown in FIG. Is done.

  6A and 6B show a state in which the exhaust side camshaft 34 continues to rotate from the state shown in FIG. 5 (that is, a state in which the exhaust side camshaft 34 is rotating). .

  As shown in FIGS. 6A and 6B, when the exhaust side camshaft 34 is rotating, the lubricating oil flowing in the bearing oil passage 52 (the lubrication filled in the bearing oil passage 52) is obtained. Oil) flows into the flat oil passage 55 by a shear flow caused by the rotation of the exhaust camshaft 34. That is, the viscosity of the lubricating oil urges the lubricating oil to flow into the flat oil passage 55 as the exhaust camshaft 34 rotates.

  Thus, the lubricating oil flows through the flat oil passage 55 in a state where the exhaust camshaft 34 is rotating. As shown in FIG. 6B, the amount of lubricating oil flowing through the flat oil passage 55 is the amount of lubricating oil flowing through other oil passages (for example, the upstream oil passage 51 and the bearing oil passage portion 52). Significantly less than the amount of.

  7A and 7B show a state in which the exhaust camshaft 34 continues to rotate from the state shown in FIG.

  As shown in FIGS. 7A and 7B, when the exhaust camshaft 34 continues to rotate, the lubricating oil flowing through the flat oil passage 55 flows into the downstream oil passage 56. The lubricating oil that has flowed into the downstream oil passage 56 flows through the downstream oil passage 56 toward the upper left in a front view.

  8A and 8B show a state in which the exhaust camshaft 34 continues to rotate from the state shown in FIG.

  As shown in FIGS. 8A and 8B, when the exhaust camshaft 34 continues to rotate, the lubricating oil flowing through the downstream oil passage 56 flows into the inner oil passage 61 of the oil supply member 60 into the inlet 63. Flows in through. The lubricating oil that has flowed into the inner oil passage 61 flows through the inner oil passage 61 toward the downstream side (specifically, the discharge port 62 side). The lubricating oil flowing through the inner oil passage 61 of the oil supply member 60 is dropped from above onto the cams 36 and 36 of the exhaust side camshaft 34 via the discharge port 62 (see FIG. 4).

  Thus, in the mode of distribution of the lubricating oil in the lubricating oil passage 50, the lubricating oil is the upstream oil passage 51, the bearing oil passage portion 52 (the cylinder head side bearing oil passage 53 and the cam cap side bearing oil passage 54). Then, after flowing through the flat oil passage 55 and the downstream oil passage 56 in order, the oil supply member 60 supplies the oil to the cams 36 and 36 (predetermined lubrication portions) of the exhaust camshaft 34.

  In the present embodiment, the pressure loss of the lubricating oil flowing through the flat oil passage 55 is equal to the pressure loss of the lubricating oil flowing through another oil passage (for example, the upstream oil passage 51 or the bearing oil passage portion 52). It can be significantly larger than that. Thus, the configuration in the present embodiment is not a configuration in which lubricating oil is intermittently supplied to the cams 36 and 36 (predetermined lubrication portions) of the exhaust side camshaft 34 as in the prior art (that is, the exhaust side). While the camshaft 34 is rotating, the lubricant oil is constantly supplied), but the lubricant oil is excessively supplied to the cams 36 and 36 (predetermined lubrication portions) of the exhaust camshaft 34. Can be prevented.

  Further, unlike the prior art, the lubricating oil passage 50 does not need to perforate (perform processing) a through hole that communicates with the outer peripheral surface of the exhaust camshaft 34, for example. That is, even when the exhaust-side camshaft 34 is a hollow member or the like and the exhaust-side camshaft 34 cannot be processed, the lubricating oil passage 50 can be formed.

  Further, the flat oil passage 55 constituting a part of the lubricating oil passage 50 is an oil passage formed by utilizing a clearance between the exhaust side camshaft 34 and the cam cap side bearing portion 41. In this way, by making the existing clearance part of the lubricating oil passage 50, for example, there is no need to drill a new hole (processing), and the flat oil passage 55 is provided with a simple configuration. Can do.

  In addition, when the exhaust-side camshaft 34 is rotating, the lubricating oil flowing through the bearing oil passage 52 flows into the flat oil passage 55. When the rotational speed of the exhaust camshaft 34 increases (when the engine 1 rotates at a high speed), the lubricating oil flows into the flat oil passage 55 as the exhaust camshaft 34 rotates. Therefore, the amount of lubricating oil flowing through the flat oil passage 55 can be increased. On the other hand, when the rotational speed of the exhaust camshaft 34 is slow (when the engine 1 rotates at a low speed), the lubricating oil flows into the flat oil passage 55 as the exhaust camshaft 34 rotates. Therefore, the amount of lubricating oil flowing through the flat oil passage 55 can be reduced. Thus, the amount of lubricating oil flowing through the flat oil passage 55 can be adjusted according to the rotational speed of the exhaust side camshaft 34, so that an appropriate amount of lubricating oil is supplied to the cam 36 of the exhaust side camshaft 34. -It can supply to 36 (predetermined lubrication part).

  9A and 9B show a state where the exhaust camshaft 34 stops rotating from the state shown in FIG. 8 (a state where the engine 1 is stopped).

  As shown in FIG. 9A, in the state where the rotation of the exhaust camshaft 34 is stopped (the state where the engine 1 is stopped), the lubricating oil is not circulated through the oil gallery 12 and the lubricating oil passage 50 (does not flow). . Then, the lubricating oil filled in the lubricating oil passage 50 moves downward due to its own weight and tries to drop out of the lubricating oil passage 50.

  Here, as shown in FIG. 9B, the lubricating oil filled in the bearing oil passage portion 52 in the lubricating oil passage 50 cannot move downward. Specifically, the downstream end of the bearing oil passage portion 52 is connected to the flat oil passage 55. Therefore, when the exhaust side camshaft 34 is not rotating, the air flowing backward from the discharge port 62 can be stopped by the flat oil passage 55. Thus, the lubricating oil filled in the bearing oil passage portion 52 remains filled in the bearing oil passage portion 52.

  In this way, when the engine 1 is restarted from the stopped state, the cams 36 and 36 (predetermined lubricating portions) of the exhaust side camshaft 34 are lubricated using the lubricating oil that is still filled in the bearing oil passage portion 52. be able to. That is, when the engine 1 is restarted, the lubricating oil can be quickly supplied to the cams 36 and 36 (predetermined lubricating portions) of the exhaust side camshaft 34.

  Although a specific description is omitted, in the structure on the intake side for opening and closing the intake valve 131, the lubricating oil is circulated in the same manner as the structure on the exhaust side for opening and closing the exhaust valve 31.

  As described above, the lubricating oil supply mechanism of the engine 1 according to an embodiment of the present invention includes the lubricating oil passage 50 through which the lubricating oil circulates, and the lubricating oil that has circulated through the lubricating oil passage 50 is discharged to the exhaust camshaft. 34 is a lubricating oil supply mechanism of an engine for supplying to the cams 36 and 36 (predetermined lubricating portions) of the engine 34. A flat oil passage 55 defined by an inner peripheral surface of the cam cap side bearing portion 41 that is rotatably supported is included, and the flat oil passage 55 is lubricated in a state where the exhaust camshaft 34 is not rotating. The oil is configured not to flow, and the lubricating oil is configured to flow along with the rotation while the exhaust camshaft 34 is rotating.

  With such a configuration, it is possible to prevent excessive supply of lubricating oil to the cams 36 and 36 (predetermined lubricating portions) of the exhaust side camshaft 34 without processing the exhaust side camshaft 34. it can.

  In the lubricating oil supply mechanism of the engine 1, the amount of lubricating oil flowing through the flat oil passage 55 is adjusted according to the rotational speed of the exhaust camshaft 34.

  With such a configuration, an appropriate amount of lubricating oil can be supplied to the cams 36 and 36 (predetermined lubricating portions) of the exhaust side camshaft 34.

  In the lubricating oil supply mechanism of the engine 1, the flat oil passage 55 is formed by utilizing a clearance between the exhaust side camshaft 34 and the cam cap side bearing portion 41.

  With such a configuration, the flat oil passage 55 can be provided with a simple configuration.

  Further, in the lubricating oil supply mechanism of the engine 1, the shaft is the exhaust side camshaft 34 of the engine 1.

  With such a configuration, the flat oil passage 55 can be provided with a simple configuration using the clearance between the exhaust side camshaft 34 and the cam cap side bearing portion 41.

  In the present embodiment, the cams 36 and 36 of the exhaust side camshaft 34 are assumed as the “predetermined lubricating portion” according to the present invention, but the present invention is not limited to this. For example, as the “predetermined lubrication part” according to the present invention, a valve stem of the exhaust valve 31 and rollers 35 and 35 of the rocker arms 32 and 32 may be assumed.

  In the present embodiment, the lubricating oil passage 50 is an embodiment of the “lubricating oil passage” according to the present invention. The configuration of the “lubricating oil passage” according to the present invention is not limited to this. For example, in the “lubricating oil passage” according to the present invention, the shape, length and arrangement of the oil passage can be arbitrarily set.

In the present embodiment, the flat oil passage 55 is an embodiment of the “compartment oil passage” according to the present invention. The configuration of the “compartment oil passage” according to the present invention is not limited to this. For example, in the “compartment oil passage” according to the present invention, the arrangement, the length in the circumferential direction, and the like can be arbitrarily set. Further, for example, the “compartment oil passage” according to the present invention is not a clearance between the exhaust side camshaft 34 and the cam cap side bearing portion 41 but between the exhaust side camshaft 34 and the cylinder head side bearing portion 11. The structure formed using the clearance may be used.
Below, the structure of the flat oil path 255 which concerns on 2nd embodiment of the "compartment oil path" which concerns on this invention, and the flat oil path 355 which concerns on 3rd embodiment is demonstrated.

  FIG. 10A shows a flat oil passage 255 according to the second embodiment of the “compartment oil passage” according to the present invention. The radial width W2 of the flat oil passage 255 is based on the clearance width between the exhaust side camshaft 34 and the cam cap side bearing portion 41 (that is, the radial width W1 of the flat oil passage 55 according to the first embodiment). Is set to be larger.

  With such a configuration, in the state where the exhaust camshaft 34 is rotating, the amount of lubricating oil flowing from the flat oil passage 255 to the downstream oil passage 56 is set to be equal to the radial width of the flat oil passage 255. The width can be increased compared with the case where the width is equal to the width of the oil (that is, the flat oil passage 55 according to the first embodiment).

  FIGS. 10B and 10C show a flat oil passage 355 according to the third embodiment of the “compartment oil passage” according to the present invention. In the flat oil passage 355, a groove portion 355 a that is recessed in the outer diameter direction is formed on the inner peripheral surface of the cam cap side bearing portion 41. The groove portion 355a is formed so as to extend between the upstream end and the downstream end of the flat oil passage 355 in the circumferential direction.

  With such a configuration, in the state where the exhaust camshaft 34 is rotating, the amount of lubricating oil flowing from the flat oil passage 355 to the downstream oil passage 56 is reduced to the flat oil passage 55 according to the first embodiment. It can be increased in comparison.

1 Engine 34 Exhaust side camshaft 36 Cam 41 Cam cap side bearing 55 Flat oil passage

Claims (4)

A lubricating oil passage through which lubricating oil circulates is provided,
A lubricating oil supply mechanism for an engine that supplies lubricating oil that has passed through the lubricating oil passage to a predetermined lubricating portion,
The lubricating oil passage includes a partition oil passage that is partitioned by an outer peripheral surface of the shaft and an inner peripheral surface of a bearing portion that rotatably supports the shaft,
The section oil passage is
In a state where the shaft is not rotating, the lubricating oil is configured not to flow,
In a state where the shaft is rotating, the lubricating oil is configured to be able to flow along with the rotation.
A lubricating oil supply mechanism for an engine. The amount of lubricating oil flowing through the partition oil passage is adjusted according to the rotational speed of the shaft.
The engine lubricating oil supply mechanism according to claim 1, wherein: The partition oil passage is formed by utilizing a clearance between the shaft and the bearing portion.
The engine lubricating oil supply mechanism according to claim 1 or 2, wherein the engine lubricating oil supply mechanism is provided. The shaft is a camshaft of the engine;
The engine lubricating oil supply mechanism according to any one of claims 1 to 3, wherein the engine lubricating oil supply mechanism is provided.

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