JP6466262B2 - Engine lubricant supply mechanism - Google Patents

Description

  The present invention relates to a technology of an engine lubricating oil supply mechanism that supplies lubricating oil to a lubricating portion of a valve operating mechanism that opens and closes an intake / exhaust valve.

  2. Description of the Related Art Conventionally, a technology of an engine lubricating oil supply mechanism that supplies lubricating oil to a lubricating portion of a valve mechanism that opens and closes an intake / exhaust valve has been publicly known. For example, as described in Patent Document 1.

  The engine lubricating oil supply mechanism described in Patent Document 1 includes an oil supply member in which a lubricating oil passage is formed. The oil supply member is disposed above the lubrication part of the valve operating mechanism, and discharges the lubricant flowing through the lubricant oil path from above to the lubrication part.

  With this configuration, the lubricating oil supply mechanism of the engine can supply the lubricating oil supplied to the lubricating oil path of the oil supply member via the predetermined oil path to the lubricating portion of the valve mechanism. .

JP 2013-253542 A

  However, in the lubricating oil supply mechanism of the engine, it is necessary to prepare in advance an oil supply member in which a lubricating oil passage is formed when manufacturing the lubricating oil supply mechanism, and to attach the prepared oil supply member to the cam cap. Therefore, there has been a problem that the cost becomes high.

  The present invention has been made in view of the above situation, and a problem to be solved is to provide a lubricating oil supply mechanism for an engine capable of reducing the cost.

  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 claim 1, a cylinder head cover provided with an inner member disposed inside is an engine lubricating oil supply mechanism that supplies lubricating oil to a lubricating portion of a valve mechanism that opens and closes an intake / exhaust valve. A lower member that is attached to the cylinder head cover while being in contact with the inner member from below, and a lubricating oil passage that is partitioned into contact portions of the lower member and the inner member. The lubricating oil path includes a groove-shaped lower groove portion that is recessed downward at a contact portion of the lower member with the inner member, and the inner member extends downward from the top plate of the cylinder head cover. And a partition plate that divides the oil separator chamber inside the cylinder head cover .

  According to a second aspect of the present invention, the lubricating oil passage includes a groove-shaped upper groove portion that is opposed to the lower groove portion in the vertical direction and is recessed upward at a contact portion of the inner member with the lower member. To do.

In claim 3, said lower member are those wherein the baffle plate partitioning the oil separator chamber.

  According to a fourth aspect of the present invention, a seal portion for sealing the periphery of the lubricating oil passage is formed in the lubricating oil passage by welding the contact portions with each other.

  According to a fifth aspect of the present invention, the lower member is attached to the cylinder head cover by the seal portion.

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

  In Claim 1, cost reduction can be aimed at.

  According to the second aspect, the size (inner diameter) of the lubricating oil passage can be easily increased.

  According to the third aspect, the cost can be further reduced.

  In the fourth aspect, leakage of the lubricating oil can be prevented.

  According to the fifth aspect, the cost can be further reduced.

Sectional drawing in the cylinder head cover of the engine which concerns on one Embodiment of this invention. The bottom perspective view showing a cylinder head cover and a baffle plate. The disassembled perspective view which shows a cylinder head cover and a baffle plate. The top view which shows a baffle plate. BB arrow sectional drawing in FIG. The enlarged view of the area | region which the arrow A in FIG. 1 shows. The bottom view which shows a cylinder head cover and a baffle plate. The disassembled perspective view which shows the cylinder head cover and baffle plate which concern on another embodiment. The enlarged view of the area | region which the arrow A in FIG. 1 concerning another embodiment shows.

  In the following, the directions indicated by arrow U, arrow D, arrow F, arrow B, arrow L and arrow R in the figure are defined as upward, downward, forward, backward, leftward and rightward, respectively. To explain.

  First, the configuration of an engine 1 including a lubricating oil supply mechanism according to an embodiment of the present invention will be described with reference to FIG.

  The engine 1 according to this embodiment has substantially the same structure on the intake side and the exhaust side. Hereinafter, for convenience of explanation, the exhaust side structure (the left side structure shown in FIG. 1) will be mainly described, and the intake side structure (the right side structure shown in FIG. 1) will be omitted as appropriate. The engine 1 mainly includes a cylinder head 10, a cylinder head cover 20, a valve mechanism 30, a cam cap 40, and a baffle plate 50.

  The cylinder head 10 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 and an oil gallery 12.

  The cylinder head side bearing portion 11 supports an exhaust side camshaft 34A, which will be described later, so as to be rotatable from below. The cylinder head side bearing portion 11 is formed on the left portion of the cylinder head 10 so as to be a semicircular concave portion whose top is opened in a front view.

  The oil gallery 12 is an oil passage that supplies lubricating oil to each part of the engine 1. The oil gallery 12 is formed so as to pass through the left side wall of the cylinder head 10 in the front-rear direction.

The cylinder head cover 20 covers the upper part of the cylinder head 10. The cylinder head cover 20 is formed in a box shape whose lower side is opened. The cylinder head cover 20 is placed on top of the cylinder head 10 and is appropriately fixed with bolts or the like. An inner member 22 is provided inside the cylinder head cover 20.
A detailed description of the configuration of the inner member 22 will be given later.

  The valve mechanism 30 opens and closes an exhaust port (not shown) of the engine 1 at a predetermined timing. The valve operating mechanism 30 mainly includes an exhaust valve 31A, a rocker arm 32, a lash adjuster 33, and an exhaust side camshaft 34A.

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

  The rocker arm 32 opens and closes the exhaust valve 31A. The rocker arm 32 is provided with a roller 35 that can rotate about an axis line in the front-rear direction. One end of the rocker arm 32 contacts the upper end of the exhaust valve 31A from above.

  The lash adjuster 33 adjusts the valve clearance. The lash adjuster 33 is brought into contact with the other end of the rocker arm 32 from below.

  The exhaust camshaft 34A swings the rocker arm 32 at a predetermined timing. When the rocker arm 32 is swung by the exhaust side camshaft 34 </ b> A, the exhaust valve 31 </ b> A is driven to open and close by the rocker arm 32. The exhaust side camshaft 34 </ b> A 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 </ b> A mainly includes a cam 36.

  The cam 36 is a portion formed in a plate shape in which the distance from the rotation center (the center of the exhaust side camshaft 34A) to the outer periphery is not constant. The cam 36 contacts the roller 35 of the rocker arm 32 from above. The cam 36 swings the rocker arm 32 by rotating about the axis of the exhaust camshaft 34A.

  The cam cap 40 is fixed to the upper part of the cylinder head 10 and holds the exhaust-side camshaft 34 </ b> A 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. The cam cap 40 mainly includes a cam cap side bearing portion 41.

  The cam cap side bearing portion 41 supports the exhaust side cam shaft 34A so as to be rotatable from above. The cam cap side bearing portion 41 is formed on the left portion of the cam cap 40 so as to be a semicircular recess that is open at the bottom when viewed from the front. The cam cap side bearing portion 41 is formed at a position facing the cylinder head side bearing portion 11 of the cylinder head 10, and supports the exhaust side camshaft 34 </ b> A together with the cylinder head side bearing portion 11 so as to be rotatable.

The baffle plate 50 partitions the oil separator chamber 21 inside the cylinder head cover 20. The baffle plate 50 is attached to the cylinder head cover 20. The oil separator chamber 21 can separate and recover the oil from the blowby gas before returning the blowby gas to the intake system.
A detailed description of the configuration of the baffle plate 50 will be described later.

  Although not specifically described, the engine 1 has an intake valve (intake side) that opens and closes an intake port (not shown) at a predetermined timing as an intake side structure (right side structure shown in FIG. 1). A mechanism 30 is provided. As shown in FIG. 1, the intake-side valve mechanism 30 mainly includes an intake valve 31B, a rocker arm 32, a lash adjuster 33, and an intake-side camshaft 34B, similarly to the exhaust-side valve mechanism 30.

In the engine 1 configured as described above, the lubricating oil supply mechanism includes a lubricating portion (in the present embodiment, an exhaust side cam) of the valve mechanism 30 that opens and closes the exhaust valve 31A and the intake valve 31B (exhaust side and intake side). Lubricating oil is supplied to the shaft 34A and the cam 36) of the intake side camshaft 34B through a predetermined oil passage. The predetermined oil path includes a lubricating oil path 60 that is partitioned at a contact portion between the baffle plate 50 and the cylinder head cover 20 (more specifically, the inner member 22 of the cylinder head cover 20).
A detailed description of the configuration of the lubricating oil passage 60 will be described later.

  Hereinafter, the configuration of the inner member 22 of the cylinder head cover 20 will be described in detail with reference to FIGS. 1 to 3 and FIG. 6.

  The inner member 22 is a portion that protrudes downward from the top plate of the cylinder head cover 20. The inner member 22 is formed integrally with the top plate of the cylinder head cover 20. The inner member 22 is formed in a shape in which a plurality of substantially rectangular parallelepiped members are arranged in various directions (longitudinal and lateral directions) in the extending direction (longitudinal direction) and appropriately combined. As shown in FIG. 1, the lower end of the inner member 22 is disposed inside the cylinder head cover 20 (above the front and rear and the lower ends of the left and right side plates) in the vertical position. As shown in FIG. 3, a lower end surface 25 that is a flat surface having no irregularities is formed at the lower end of the inner member 22. The lower end surface 25 is a portion (contact portion) that contacts the baffle plate 50 as described later. The inner member 22 is made of synthetic resin.

  In the following description, the direction in which the lower end surface 25 of the inner member 22 and the lower groove 51 (lubricating oil passage 60) described later extend in the bottom view is referred to as the longitudinal direction, and the direction perpendicular to the longitudinal direction is referred to as the longitudinal direction. Called the short direction.

  The lower end surface 25 of the inner member 22 is a part that constitutes a part of the lubricating oil path 60. More specifically, the lower end surface 25 of the inner member 22 is a portion constituting the upper inner peripheral surface of the inner peripheral surface of the lubricating oil passage 60. The lower end surface 25 of the inner member 22 is formed so as to extend while appropriately bending or branching from one (start) end portion to a plurality of other (end) end portions in a bottom view. In this way, the lower end surface 25 of the inner member 22 is formed in a shape along the lubricating oil flow path (that is, the lubricating oil path 60) in the bottom view. In the present embodiment, as shown in FIG. 6, among the lower end surface 25 of the inner member 22, the central portion 26 located in the center between the end portions 27 and 27 in the short direction is a lubricating oil passage. 60 is a portion constituting the inner peripheral surface on the upper side.

  Hereinafter, the configuration of the baffle plate 50 will be described in detail with reference to FIGS. 1 to 6.

  The baffle plate 50 is formed in a substantially rectangular plate shape when viewed from the bottom. The baffle plate 50 is disposed with the plate surface directed in the vertical direction and the longitudinal direction directed in the front-rear direction. The baffle plate 50 is formed smaller than the inside of the cylinder head cover 20 in a bottom view. The baffle plate 50 is attached in contact with the inner member 22 of the cylinder head cover 20 from below. Thus, the baffle plate 50 is disposed inside the cylinder head cover 20 in the vertical position. The baffle plate 50 is made of a synthetic resin. The baffle plate 50 mainly includes a lower groove 51, an introduction port 52, and a discharge port 53.

  The lower groove 51 is a part that constitutes a part of the lubricating oil passage 60. More specifically, the lower groove portion 51 is a portion constituting an inner peripheral surface other than the upper side of the inner peripheral surface of the lubricating oil passage 60. The lower groove 51 is formed in a groove shape that is recessed downward. The upper side of the lower groove 51 is opened upward. The lower groove portion 51 is formed in substantially the same size and shape as the central portion 26 of the inner member 22 in a bottom view. That is, the lower groove portion 51 is formed so as to extend while appropriately bending and branching from one (start) end portion to a plurality of other (end) end portions in a bottom view. Thus, the lower groove portion 51 is formed in a shape along the lubricating oil flow path (that is, the lubricating oil path 60) in the bottom view. In the baffle plate 50, the lower groove portion 51 and the periphery thereof are portions (contact portions) that are in contact with the inner member 22 of the cylinder head cover 20.

  The introduction port 52 is a part for introducing the lubricating oil into the lower groove portion 51 (the lubricating oil passage 60). The introduction port 52 extends downward from the bottom surface of the lower groove portion 51 and is formed so as to penetrate the baffle plate 50 in the vertical direction. The introduction port 52 is formed in the vicinity of the left front end portion of the baffle plate 50. The introduction port 52 communicates with the oil gallery 12 via a predetermined oil passage. The inlet 52 is formed at the start end of the lower groove 51 (lubricating oil passage 60).

  The discharge port 53 is a portion that discharges (supplies) the lubricating oil flowing through the lower groove portion 51 (the lubricating oil passage 60) to the lubricating portion of the valve operating mechanism 30. The discharge port 53 extends downward from the bottom surface of the lower groove portion 51 and is formed so as to penetrate the baffle plate 50 in the vertical direction. A plurality of discharge ports 53 are provided, and are formed at the respective end portions of the lower groove portion 51 (positions corresponding to the lubrication portions of the valve operating mechanism 30). Specifically, the discharge port 53 is formed substantially above the cams 36 of the exhaust side camshaft 34A and the intake side camshaft 34B.

  The baffle plate 50 having the above-described configuration is attached to the cylinder head cover 20 while being in contact with the inner member 22 from below. In this way, when the baffle plate 50 is attached to the cylinder head cover 20, the lubricating oil path 60 is defined at the contact portion between the baffle plate 50 and the inner member 22.

  Below, the attachment aspect of the baffle plate 50 and the cylinder head cover 20 and the structure of the lubricating oil passage 60 partitioned by the attachment will be described in detail with reference to FIGS. 1 to 3, 6 and 7.

  As shown in FIG. 3, the baffle plate 50 is disposed at a position facing the cylinder head cover 20 in the vertical direction when attached to the cylinder head cover 20. The baffle plate 50 is overlapped with the cylinder head cover 20 in the vertical direction, and the upper side surface (more specifically, the lower groove 51 and the periphery thereof) of the baffle plate 50 and the lower end surface 25 of the inner member 22 of the cylinder head cover 20 are connected. Abutted. When the upper side surface of the baffle plate 50 and the lower end surface 25 of the inner member 22 are brought into contact with each other, the central portion 26 of the inner member 22 is disposed above the lower groove portion 51 of the baffle plate 50. Thus, the upper portion of the lower groove 51 is closed by the central portion 26 of the inner member 22, and the lubricating oil passage 60, which is a substantially sealed space, is defined at the contact portion between the baffle plate 50 and the inner member 22. .

  Like the lower end surface 25 of the inner member 22 and the lower groove portion 51 of the baffle plate 50, the lubricating oil passage 60 is bent or bent from one (start) end to a plurality of other (end) ends in the bottom view. It is formed to extend while appropriately branching. The cross-sectional shape of the lubricating oil passage 60 in the short direction is formed to be a substantially rectangular shape. The lubricating oil passage 60 can circulate lubricating oil from the starting end portion toward a plurality of terminal end portions.

  The baffle plate 50 and the cylinder head cover 20 are attached by laser welding using laser light to the abutting portions of the baffle plate 50 and the inner member 22.

  More specifically, as shown in FIG. 6, when the baffle plate 50 and the cylinder head cover 20 are attached, the baffle plate 50 is in contact with the upper side surface of the baffle plate 50 and the lower end surface 25 of the inner member 22. Laser light (see the black arrow shown in FIG. 6) is irradiated from the 50 side toward the lower end surface 25 side of the inner member 22. Thus, the portions irradiated with the laser light at the contact portions of the baffle plate 50 and the inner member 22 are welded to each other. That is, the baffle plate 50 and the inner member 22 are joined, and the baffle plate 50 is attached to the cylinder head cover 20.

  Here, a thick broken line shown in FIG. 7 indicates a portion irradiated with laser light at the contact portion between the baffle plate 50 and the inner member 22. As described above, the laser light irradiation is performed so as to surround the lubricating oil path 60 in a portion in the vicinity of the lubricating oil path 60. That is, the welded portion (hereinafter referred to as “seal portion 61”) is formed around the lubricating oil passage 60 without a substantial gap, thereby sealing the lubricating oil passage 60. Thus, the seal portion 61 can prevent the lubricating oil flowing through the lubricating oil passage 60 from leaking from the lubricating oil passage 60.

  In the following, a description will be given of how the lubricating oil is supplied to the lubricating portions (the exhaust side camshaft 34A and the intake side camshaft 34B cam 36) of the valve operating mechanism 30 in the lubricating oil supply function of the engine 1 configured as described above. .

  The lubricating oil flowing through the oil gallery 12 is supplied to an inlet 52 formed in the baffle plate 50 through a predetermined oil passage. The lubricating oil supplied to the inlet 52 is introduced into the lubricating oil passage 60 through the inlet 52. The lubricating oil introduced into the lubricating oil passage 60 circulates through the lubricating oil passage 60 toward a plurality of terminal portions with the portion where the introduction port 52 is formed as the starting end portion. The lubricating oil that has circulated to the plurality of terminal portions is discharged to the lower side of the lubricating oil passage 60 through the discharge port 53 formed in the terminal portions. Lubricating oil discharged from the discharge port 53 is supplied to the lubricating part of the valve operating mechanism 30 disposed substantially below the discharge port 53.

  As described above, in the lubricating oil supply function of the engine 1, the lubricating oil is circulated through the lubricating oil passage 60 formed in the contact portion between the baffle plate 50 and the inner member 22, and the lubricating oil is supplied to the lubricating portion of the valve mechanism 30. And lubricating oil can be supplied.

As described above, the lubricating oil supply mechanism of the engine 1 according to the embodiment of the present invention is
A lubricating oil supply mechanism of the engine 1 that supplies lubricating oil to a lubricating portion (the cam 36 of the exhaust side camshaft 34A and the intake side camshaft 34B) of the valve mechanism 30 that opens and closes the intake valve 31B and the exhaust valve 31A. ,
A cylinder head cover 20 provided with an inner member 22 disposed inside;
A baffle plate 50 (lower member) attached to the cylinder head cover 20 in contact with the inner member 22 from below;
A lubricating oil passage 60 defined in the abutment portion of the baffle plate 50 (lower member) and the inner member 22;
The lubricating oil passage 60 includes a groove-shaped lower groove 51 that is recessed downward in a contact portion (the lower groove 51 and the periphery thereof) of the baffle plate 50 (lower member) with the inner member 22. To do.

  With such a configuration, for example, when the lubricating oil supply mechanism of the engine 1 is manufactured, an oil supply member in which the lubricating oil passage 60 is formed is prepared in advance, or the prepared oil supply member is attached to the cam cap 40 or the like. The lubricating oil passage 60 can be formed as long as the baffle plate 50 is attached to the cylinder head cover 20 without being necessary. That is, in the lubricating oil supply mechanism of the engine 1, cost reduction can be achieved.

In the lubricating oil supply mechanism of the engine 1 according to the embodiment of the present invention,
The baffle plate 50 (lower member) defines an oil separator chamber 21 inside the cylinder head cover 20.

  With such a configuration, the lubricating oil passage 60 can be formed as long as the baffle plate 50, which is generally a member attached to the cylinder head cover 20, is attached to the cylinder head cover 20. As described above, in the lubricating oil supply mechanism of the engine 1, it is not necessary to use a dedicated component for forming the lubricating oil path 60 in order to form the lubricating oil path 60, and thus the number of parts is reduced. As a result, the cost can be further reduced.

In the lubricating oil supply mechanism of the engine 1 according to the embodiment of the present invention,
The lubricating oil passage 60 is formed with a seal portion 61 that seals the periphery of the lubricating oil passage 60 by welding the contact portions.

  With such a configuration, in the lubricating oil supply mechanism of the engine 1, leakage of the lubricating oil flowing through the lubricating oil passage 60 can be prevented by the seal portion 61.

In the lubricating oil supply mechanism of the engine 1 according to the embodiment of the present invention,
The baffle plate 50 (lower member) is attached to the cylinder head cover 20 by the seal portion 61.

  With such a configuration, when the baffle plate 50 is attached to the cylinder head cover 20, it is possible to eliminate the need to use a fixture such as a bolt. That is, the seal portion 61 has a function of preventing the leakage of the lubricating oil flowing through the lubricating oil passage 60 and a function of attaching the baffle plate 50 to the cylinder head cover 20. As described above, in the lubricating oil supply mechanism of the engine 1, since the seal portion 61 has two functions, the number of parts can be reduced and the mounting work using the mounting tool can be eliminated. Cost can be further reduced.

The intake valve 31B and the exhaust valve 31A according to the present embodiment are an embodiment of the intake / exhaust valve according to the present invention.
Further, the cams 34 of the exhaust side camshaft 34A and the intake side camshaft 34B according to the present embodiment are one embodiment of the lubrication part of the valve operating mechanism according to the present invention.
The inner member 22 according to the present embodiment is an embodiment of the inner member according to the present invention.
The cylinder head cover 20 according to this embodiment is an embodiment of the cylinder head cover according to the present invention.
The baffle plate 50 according to the present embodiment is an embodiment of the lower member according to the present invention.
In addition, the lower end surface 25 of the inner member 22 according to the present embodiment and a part of the baffle plate 50 that contacts the lower end surface 25 (the lower groove portion 51 and its surroundings) are mutually abutting portions according to the present invention. It is one Embodiment of this.
Moreover, the lower groove part 51 which concerns on this embodiment is one Embodiment of the lower groove part which concerns on this invention.
The oil separator chamber 21 according to this embodiment is an embodiment of the oil separator chamber according to the present invention.
Moreover, the seal part 61 which concerns on this embodiment is one Embodiment of the seal part which concerns on this invention.

  Although one embodiment of the present invention has been described above, the present invention is not limited to the configuration described above, and various modifications can be made within the scope of the invention described in the claims.

  For example, the size and shape of the lubricating oil path 60 (lower groove 51) are not limited to the configuration of the present embodiment. The size and shape of the lubricating oil passage 60 (lower groove portion 51) can be arbitrarily changed according to various conditions such as the arrangement of the lubricating portion of the valve operating mechanism.

  Moreover, in this embodiment, although the baffle plate 50 was illustrated, the lower member which concerns on this invention is not limited to this. For example, the lower member according to the present invention may not have the function of partitioning the oil separator chamber 21 inside the cylinder head cover 20.

  Moreover, in this embodiment, although the structure which attached the baffle plate 50 to the cylinder head cover 20 only by the seal | sticker part 61 was illustrated, it is not limited to this. For example, the baffle plate 50 (the lower member according to the present invention) is for attaching to the cylinder head cover 20 in order to prevent leakage of the lubricating oil flowing through the lubricating oil passage 60 to a portion other than the seal portion 61. No) Laser welding may be performed only for the attachment of the baffle plate 50. Further, the baffle plate 50 may be attached using an attachment such as a bolt. The baffle plate 50 may be attached by a combination of these.

  Moreover, in this embodiment, although the structure which the seal part 61 was formed by laser welding was illustrated, it is not limited to this. As the type of welding for forming the seal portion 61, an arbitrary one can be selected from ultrasonic welding, vibration welding, hot plate welding, and the like in addition to laser welding.

  Further, the size and shape of the inner member 22 (and the lower end surface 25 of the inner member 22) are not limited to the configuration of the present embodiment. For example, in this embodiment, although the structure formed so that the lower end surface 25 of the inner member 22 may become a shape along the lubricating oil path 60 was illustrated, it is not limited to this. The lower end surface 25 of the inner member 22 (the contact portion with the lower member of the inner member according to the present invention) can be changed to an arbitrary shape after including a portion facing the lower groove portion 51.

  In this way, by changing the shape of the inner member 22 and the lower end surface 25 of the inner member 22, for example, the inner member 22 may have a function as a partition plate for forming the labyrinth structure of the oil separator chamber 21. it can. According to such a configuration, in the lubricating oil supply mechanism of the engine 1, the inner member 22 serves both as a function of constituting a part of the lubricating oil passage 60 and a function as the partition plate. The number of parts can be reduced, and as a result, the cost can be further reduced.

  Moreover, in this embodiment, although the shape of the lower end surface 25 of the inner member 22 was comprised as a plane without an unevenness | corrugation, it is not limited to this. The shape of the lower end surface 25 of the inner member 22 (the contact portion with the lower member of the inner member according to the present invention) can be changed to an arbitrary shape.

  Hereinafter, an example of the configuration in which the shape of the lower end surface 25 of the inner member 22 is changed (the cylinder head cover 20 and the baffle plate 50 according to another embodiment) will be described with reference to FIGS. 8 and 9.

  As shown in FIGS. 8 and 9, the cylinder head cover 20 and the baffle plate 50 according to another embodiment are changed from the above-described embodiment (hereinafter referred to as the first embodiment) in that the inner member 22 is changed. The shape of the lower end surface 25 is changed, and the upper groove portion 29 is provided. Below, the point changed with 1st embodiment is demonstrated and about the point which is the same as the said 1st embodiment, description is abbreviate | omitted by attaching | subjecting the same code | symbol.

  The upper groove portion 29 is a portion constituting a part of the lubricating oil passage 60. More specifically, the upper groove portion 29 is a portion constituting a substantially upper inner peripheral surface of the inner peripheral surface of the lubricating oil passage 60. The upper groove portion 29 is formed in a groove shape recessed upward. The lower side of the upper groove 29 is opened downward. The upper groove portion 29 is formed in a portion corresponding to the central portion 26 in the first embodiment. The upper groove portion 29 is formed in substantially the same size and shape as the center portion 26 of the inner member 22 in a bottom view. That is, the upper groove portion 29 is formed to extend while appropriately bending or branching from one (start) end portion to a plurality of other (end) end portions in a bottom view. In this way, the upper groove 29 is formed in a shape along the lubricating oil flow path (that is, the lubricating oil path 60) in the bottom view.

  Thus, when the baffle plate 50 is attached to the cylinder head cover 20, when the upper side surface of the baffle plate 50 and the lower end surface 25 of the inner member 22 come into contact with each other, the inner member is located above the lower groove portion 51 of the baffle plate 50. 22 upper grooves 29 are arranged. That is, the upper groove portion 29 and the lower groove portion 51 are arranged to face each other in the vertical direction. Thus, the upper side of the lower groove portion 51 is closed by the upper groove portion 29 of the inner member 22, and the lubricating oil passage 60, which is a substantially sealed space, is defined at the contact portion between the baffle plate 50 and the inner member 22. The

  With this configuration, when the lubricating oil passage 60 is formed, the cross-sectional shape of the lubricating oil passage 60 in the short direction is a groove-like upper groove portion 29 that is recessed upward and a groove-like shape that is recessed downward. The lower groove 51 forms a substantially rectangular shape.

As described above, in the lubricating oil supply mechanism of the engine 1 including the cylinder head cover 20 and the baffle plate 50 according to another embodiment,
The lubricating oil passage 60 has a groove shape that is opposed to the lower groove portion 51 in the vertical direction on the lower end surface 25 of the inner member 22 (the contact portion of the inner member with the lower member) and is recessed upward. The upper groove 29 is provided.

  Here, since the space inside the cylinder head cover 20 is small, there is a case where there is a restriction on the size (the length protruding downward) of the lower groove 51. However, in another embodiment having the above-described configuration, the lubricating oil passage 60 is formed by using the upper groove portion 29 of the inner member 22 in addition to the lower groove portion 51, so that it is related to the space inside the cylinder head cover 20. In addition, the size (inner diameter) of the lubricating oil passage 60 can be changed. That is, in another embodiment, the size (inner diameter) of the lubricating oil passage 60 can be easily increased.

  The upper groove portion 29 according to the present embodiment is an embodiment of the upper groove portion according to the present invention.

1 Engine 22 Inner member 25 Lower end surface 31A Exhaust valve 31B Intake valve 34A Exhaust side camshaft 34B Intake side camshaft 50 Baffle plate

Claims (5)

A lubricating oil supply mechanism for an engine that supplies lubricating oil to a lubricating portion of a valve mechanism that opens and closes an intake / exhaust valve,
A cylinder head cover provided with an inner member disposed inside;
A lower member attached to the cylinder head cover in a state of being in contact with the inner member from below;
A lubricating oil passage that is partitioned into contact portions of the lower member and the inner member;
The lubricating oil passage includes a groove-shaped lower groove portion recessed downward in a contact portion of the lower member with the inner member ,
The inner member protrudes downward from the top plate of the cylinder head cover and is formed in a shape along the lubricating oil path, and constitutes a partition plate that partitions the oil separator chamber inside the cylinder head cover. ,
A lubricating oil supply mechanism for an engine. The lubricating oil passage includes a groove-shaped upper groove portion which is opposed to the lower groove portion in the vertical direction and is recessed upward in a contact portion between the inner member and the lower member.
The engine lubricating oil supply mechanism according to claim 1, wherein: The lower member is a baffle plate partitioning the oil separator chamber,
The engine lubricating oil supply mechanism according to claim 1 or 2, wherein the engine lubricating oil supply mechanism is provided. In the lubricating oil passage, a seal portion that seals the periphery of the lubricating oil passage is formed by welding the mutual contact portions.
The engine lubricating oil supply mechanism according to any one of claims 1 to 3, wherein the engine lubricating oil supply mechanism is provided. The lower member is attached to the cylinder head cover by the seal portion.
The lubricating oil supply mechanism for an engine according to claim 4.

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