JP2010261357A - Lubricating oil supply structure to pivot member and rocker arm - Google Patents

Abstract

[PROBLEMS] To improve workability of a passage for supplying lubricating oil to a rocker arm.
A pivot member 10 is inserted into a mounting hole 86 of a cylinder head 80, and swings by a cam 60 to constitute a swing fulcrum of a rocker arm 30 that opens and closes a valve 83. On the outer peripheral surface of the main body 11 inserted into the mounting hole 86, a first groove 17 having a transverse groove that goes around the outer peripheral surface and faces the oil supply passage 87 opened on the inner peripheral surface of the mounting hole 86, A vertical groove-shaped second passage 18 is formed that extends to the rocker arm 30 side and opens while intersecting the first passage 17. The lubricating oil is supplied to the sliding portion of the rocker arm 30 through the oil supply passage 87, the first passage 17 and the second passage 18 in order.
[Selection] Figure 1

Description

  The present invention relates to a structure for supplying lubricating oil to a pivot member and a rocker arm.

  Patent Document 1 discloses means for supplying lubricating oil to a sliding portion of a rocker arm in a valve operating apparatus for an internal combustion engine. One end portion of the rocker arm is supported by the pivot member so as to be swingable from below, the other end portion is in contact with the valve, and an intermediate portion thereof is in contact with the cam so that it can be pushed from above. ing. When the cam rotates, the rocker arm is swung with the upper end portion of the pivot member as a fulcrum, whereby the valve is reciprocated in the vertical direction to perform its opening / closing operation.

  Accordingly, since the sliding portion is between one end portion of the rocker arm and the upper end portion of the pivot member and between the roller and the cam, it is necessary to supply lubricating oil thereto. For example, an oil supply passage is formed through the cam and its drive shaft, and lubricating oil is supplied to the sliding portion from the cam side (above) through the passage. Yes. However, in such a configuration, there is a problem that an oil supply passage must be drilled inside the cam, and workability is poor.

JP 2006-291913 A

  The present invention has been completed based on the above circumstances, and an object thereof is to improve the workability of a passage for supplying lubricating oil to a rocker arm.

  As means for achieving the above-mentioned object, the invention of claim 1 is characterized in that a rocker arm inserted into a mounting hole of a cylinder head and rocked by a cam to open and close a valve is supported. The outer circumferential surface of the main body portion inserted into the mounting hole has a lateral groove-like shape that makes one round of the outer circumferential surface and faces an oil supply passage opened on the inner circumferential surface of the mounting hole. It is characterized in that a first passage and a second groove-shaped second passage that extends to the rocker arm side and opens while intersecting with the first passage are formed.

  According to a second aspect of the present invention, in the first aspect, the depth of the second passage is shallower than the depth of the first passage, and the groove width of the second passage is the groove width of the first passage. It is characterized by a narrower area.

  A third aspect of the invention is characterized in that, in the first or second aspect of the invention, the second passage is arranged at equal intervals in the circumferential direction in at least three locations on the outer peripheral surface of the main body. Have

  The invention of claim 4 is characterized in that, in the invention of any one of claims 1 to 3, the second passage is formed in a spiral shape on the outer peripheral surface of the main body.

  The invention of claim 5 is characterized in that, in the structure of any one of claims 1 to 4, the cross-sectional shape of the second passage is V-shaped.

  The invention of claim 6 is characterized in that, in the invention of any one of claims 1 to 5, the entirety is a single rigid body.

  A seventh aspect of the present invention is a structure for supplying lubricating oil to a rocker arm that swings on a cam to open and close a valve, and is provided with a mounting hole recessed in a cylinder head and inserted into the mounting hole. A pivot member that constitutes a rocking fulcrum of the rocker arm, and an oil supply passage for lubricating oil is formed in the inner peripheral surface of the mounting hole, and the outer peripheral surface of the pivot member is entirely covered by the outer peripheral surface. A transverse groove-shaped first passage that extends over the circumference and faces the oil supply passage, and a longitudinal groove-shaped second passage that opens to the rocker arm side while intersecting the first passage are formed. The oil is characterized in that oil is supplied to the sliding portion of the rocker arm through the oil supply passage, the first passage, and the second passage sequentially.

<Invention of Claims 1 and 7>
The passage for supplying lubricating oil to the sliding part of the rocker arm is constituted by the oil supply passage, the first passage and the second passage, and the first passage and the second passage are formed on the outer peripheral surface of the main body portion of the pivot member. The workability is improved as compared with the case where the passage is formed by drilling the inside of the member. In addition, since the first passage has a shape that goes around the outer peripheral surface of the main body part, when inserting the main body part into the mounting hole, the position of the main body part in the axial direction and the position of the oil supply path in the mounting hole are not confirmed. In both cases, the first passage can be exposed to the oil supply passage, and the assemblage to the mounting hole is excellent.

<Invention of Claim 2>
Since the depth of the second passage is shallower than the depth of the first passage and the groove width of the second passage is narrower than the groove width of the first passage, the flow velocity of the lubricating oil is increased in the second passage, Good jetting performance to the rocker arm.

<Invention of Claim 3>
Since the second passages are arranged at equal intervals in the circumferential direction at at least three locations on the outer peripheral surface of the main body, the lubricating oil is reliably supplied to the sliding portion of the rocker arm.

<Invention of Claim 4>
If the main body does not rotate within the mounting hole, the rocker arm may swing, and stress may concentrate on a fixed portion of both sliding surfaces of the main body and the rocker arm. Therefore, in order to improve the durability of the main body portion and the rocker arm, it is preferable that the main body portion actively rotates within the mounting hole. In that respect, according to the invention of claim 4, since the second passage is formed in a spiral shape on the outer peripheral surface of the main body portion, the lubricating oil flows along the spiral of the second passage, and accordingly the main body The rotation of the part is induced.

<Invention of Claim 5>
Since the cross-sectional shape of the second passage is V-shaped, the workability of the second passage becomes better.

<Invention of Claim 6>
Since the pivot member is a single rigid body, unlike the lash adjuster, there is no possibility of adversely affecting the operability due to air mixing from the second passage during a pause.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view illustrating an entire valve gear for an internal combustion engine according to a first embodiment of the present invention. It is a front view of a pivot member. It is a top view of the pivot member inserted in the mounting hole of the cylinder head. It is a front view of the pivot member which concerns on Embodiment 2 of this invention. It is sectional drawing which concerns on Embodiment 3 of this invention, and shows the whole valve operating apparatus of an internal combustion engine.

<Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS.
First, a valve operating apparatus for an internal combustion engine will be described. As shown in FIG. 1, the cylinder head 80 is formed with a ventilation path 81 (intake port or exhaust port) and a stem hole 82 that communicates with the ventilation path 81 and opens on the upper surface of the cylinder head 80. In the stem hole 82 of the cylinder head 80, a valve 83 (intake valve or exhaust valve) for opening and closing the vent opening facing the vent path 81 is mounted so as to be able to reciprocate vertically between the valve open position and the valve close position. Has been. The valve 83 is always biased upward (in the valve closing direction) by the valve spring 84, and the upper end portion of the valve 83 protrudes above the upper end opening of the stem hole 82.

  A rocker arm 30 is disposed above the cylinder head 80. The rocker arm 30 includes an arm body 31 that is long in the front-rear direction and a roller 32 that is attached to the arm body 31. A roller accommodating portion 33 for accommodating the roller 32 is formed in the center portion in the front-rear direction of the arm body 31 so as to penetrate in the vertical direction. The upper end of the roller 32 is disposed so as to be exposed above the upper end of the arm body 31, and is in contact with the egg-shaped cam 60 formed on the rotation shaft 61 parallel to the rotation center of the roller 32 from below.

  A valve abutting portion 34 is formed at the rear end portion of the arm body 31 to abut against the upper end of the valve 83 from above to press the valve 83 in the opening direction against the urging force of the valve spring 84. . A bearing 35 is formed at the front end of the arm body 31 so as to bulge upward in a substantially hemispherical shape so as to receive an upper end of a pivot member 10 to be described later. The rocker arm 30 is swingable with the upper end portion of the pivot member 10 as a fulcrum, and the inner surface (lower surface) of the bearing portion 35 is a hemispherical concave surface 36 that is in sliding contact with the upper end portion of the pivot member 10 when the rocker arm 30 swings. It is said that. An umbrella portion 37 is formed at the lower end of the bearing portion 35 so as to surround the hemispherical concave surface 36. The boundary between the lower surface of the umbrella portion 37 and the hemispherical concave surface 36 of the bearing portion 35 and the inner surface of the roller accommodating portion 33 is rounded. The surface 38 is used.

  A mounting hole 86 having a bottom and a circular cross section is provided on the upper surface of the cylinder head 80 so that the pivot member 10 is inserted into the mounting hole 86 with almost no gap. An oil supply passage 87 is formed through the cylinder head 80, and an intermediate portion of the oil supply passage 87 is opened as an oil port on the inner peripheral surface of the mounting hole 86.

  The pivot member 10 is a solid and single rigid body, and as shown in FIG. 2, is constituted by a main body 11 that is long in the vertical direction (height direction). The main body portion 11 has a columnar shape, and a tapered shoulder portion 12 that is gradually reduced in diameter upward is formed at the upper end portion thereof over the entire circumference. Of the main body 11, the part below the shoulder 12 is the body 13 buried in the mounting hole 86, and the part above the shoulder 12 is exposed above the upper surface of the cylinder head 80. Thus, the neck 14 is arranged.

  The outer peripheral surface of the neck portion 14 is a hemispherical convex surface 15 that can be slidably contacted with the hemispherical concave surface 36 of the bearing portion 35, and a substantially upper half portion thereof is fitted in the bearing portion 35.

  At the lower end of the outer peripheral surface of the body portion 13, a tapered guide surface 16 that leads into the mounting hole 86 is formed by cutting out the entire periphery. A lateral groove-shaped first passage 17 that goes around the outer circumferential surface is formed in the middle in the vertical direction of the outer circumferential surface of the body portion 13. Specifically, the first passage 17 has an annular groove shape that extends over the entire outer peripheral surface of the body portion 13, and an oil supply passage 87 that is opened in the inner peripheral surface of the mounting hole 86 when inserted into the mounting hole 86. It is located at the same height as the (oil port) and faces the oil supply passage 87. The cross-sectional shape of the first passage 17 is curved.

  A longitudinal groove-shaped second passage 18 that extends across the first passage 17 is formed on the outer peripheral surface of the body portion 13. Specifically, the second passage 18 has a shape that extends in both the upper and lower directions across the first passage 17 through the first passage 17, and has an upper end opened in the tapered surface of the shoulder portion 12, and a lower end that is a guide surface. 16 is opened, and the middle of the extension is divided by the first passage 17. When the rocker arm 30 is assembled, the upper end opening of the second passage 18 is disposed to face the lower surface of the rocker arm 30.

  More specifically, as shown in FIG. 3, the second passage 18 is arranged at three locations on the outer peripheral surface of the body portion 13 at equal intervals in the circumferential direction, and an angle of approximately 30 degrees with respect to the vertical direction. It is formed so as to be inclined in a spiral shape. The cross-sectional shape of the second passage 18 is V-shaped. Further, the groove width of the second passage 18 is narrower than the groove width of the first passage 17, and the depth of the second passage 18 is shallower than the depth of the first passage 17.

Next, the effect of this embodiment is demonstrated.
First, the pivot member 10 is inserted into the mounting hole 86 of the cylinder head 80, and in this state, the bearing portion 35 of the rocker arm 30 is placed on the neck portion 14 of the pivot member 10 and the valve abutting portion is placed on the upper end of the valve 83. 34 and the roller 32 is brought into contact with the outer peripheral surface of the cam 60 from below. Thereby, as shown in FIG. 1, the pivot member 10 and the rocker arm 30 are incorporated in the valve operating apparatus. When the pivot member 10 is inserted into the mounting hole 86, air is released through the second passage 18, so that good assemblability is ensured. Further, in this assembled state, the upper end openings of all the second passages 18 are arranged to face the lower part of the umbrella portion 37, and the upper end openings of at least one second passage 18 are arranged in the vicinity of the lower part of the roller 32. .

  At the time of driving, the roller 32 rotates about the rotation axis while being pushed by the outer peripheral surface of the rotating cam 60, and the rocker arm 30 is oscillated and displaced (swinging displacement) with the neck portion 14 of the pivot member 10 as a fulcrum. The push-pull action of the valve contact portion 34 and the valve spring 84 is developed, and the valve 83 is opened and closed.

  Further, during driving, the lubricating oil flowing through the oil supply passage 87 passes through the first passage 17 and the second passage 18 sequentially from the oil port and is jetted toward the lower surface of the umbrella portion 37 of the rocker arm 30. Part of the lubricating oil adhering to the lower surface of the umbrella portion 37 thus enters between the hemispherical concave surface 36 of the bearing portion 35 and the hemispherical convex surface 15 of the neck portion 14 from the lower surface of the umbrella portion 37 via the rounded surface 38. The both surfaces 15 and 36 are lubricated to prevent the both surfaces 15 and 36 from being seized.

  Further, a part of the lubricating oil adhering to the lower surface of the umbrella portion 37 enters between the inner surface of the roller accommodating portion 33 and the outer peripheral surface of the roller 32 from the lower surface of the umbrella portion 37 via the rounded surface 38, and the roller 32 there. As the roller 32 rotates, the outer peripheral surface of the roller 32 and the outer peripheral surface of the cam 60 are lubricated to prevent both sides from being cooked.

  In this case, the lubricating oil moves from the first passage 17 to the second passage 18 and flows along the spiral of the second passage 18, so that the pivot member 10 (main body portion 11) has the inclination direction of the second passage 18. Is applied. For this reason, the pivot member 10 (main body portion 11) rotates around the axis as the lubricant flows.

  As described above, according to the present embodiment, lubricating oil is supplied between the outer peripheral surface of the roller 32 and the outer peripheral surface of the cam 60 and between the hemispherical concave surface 36 of the bearing portion 35 and the hemispherical convex surface 15 of the neck portion 14. Since the passage for this is constituted by the oil supply passage 87, the first passage 17 and the second passage 18, the first passage 17 and the second passage 18 are formed on the outer peripheral surface of the main body 11 of the pivot member 10, so that It is more workable than drilling the inside to form the passage.

  Further, since the first passage 17 has a shape that makes one round of the outer peripheral surface of the body portion 13, when the main body portion 11 is inserted into the attachment hole 86, the position of the main body portion 11 in the axial direction and the oil supply path in the attachment hole 86. Even if the position of 87 is not concerned, the first passage 17 can be made to face the oil supply passage 87, and the workability of assembling into the mounting hole 86 is excellent.

  Further, since the depth of the second passage 18 is shallower than the depth of the first passage 17 and the groove width of the second passage 18 is narrower than the groove width of the first passage 17, the flow rate of the lubricating oil is set to the second passage 18. As a result, the injection property of the lubricating oil to the rocker arm 30 is improved. In this case, the lubricant oil jetted vigorously is reliably received by the umbrella portion 37.

  In addition, since the second passage 18 is disposed at three locations on the outer peripheral surface of the main body 11 at equal intervals in the circumferential direction, the lubricating oil is slid on the sliding portion of the rocker arm 30 (the outer peripheral surface of the roller 32 and the cam 60). The outer peripheral surface and the hemispherical concave surface 36 of the bearing portion 35 and the hemispherical convex surface 15) of the neck portion 14 are reliably supplied.

  Further, since the second passage 18 is formed in a spiral shape on the outer peripheral surface of the body portion 13, the pivot member 10 (main body portion 11) rotates in the mounting hole 86 as the lubricating oil flows, As a result, the sliding location between the hemispherical convex surface 15 of the neck portion 14 and the hemispherical concave surface 36 of the bearing portion 35 changes at any time. For this reason, it is avoided that stress concentrates on a part of sliding part of both surfaces 15 and 36, and the progress of local abrasion of the neck part 14 and the bearing part 35 is prevented. As a result, the durability of the rocker arm 30 and the pivot member 10 is improved.

  Moreover, since the cross-sectional shape of the 2nd channel | path 18 has comprised V shape, the workability of the 2nd channel | path 18 becomes more favorable.

  Further, since the pivot member 10 is a single rigid body, unlike the lash adjuster, there is no possibility that the operability is hindered by the mixing of air from the second passage 18 during rest.

<Embodiment 2>
Next, a second embodiment of the present invention will be described with reference to FIG. In the second embodiment, the shape of the second passage 18 is different from that of the first embodiment. Others are the same as those of the first embodiment, and the same components as those of the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

  The second passage 18 </ b> A of the pivot member 10 </ b> A according to the second embodiment extends straight from the upper edge of the first passage 17 substantially vertically and has an upper end opened to the tapered surface of the shoulder portion 12. Unlike the first embodiment, the second passage 18A is not formed below the first passage 17, but is disposed at three locations that are equally spaced in the circumferential direction in that the cross-sectional shape is V-shaped. Are the same as in the first embodiment in that the groove width and depth are smaller than those of the first passage 17. According to the second embodiment, the shape of the second passage 18A can be simplified.

<Embodiment 3>
FIG. 5 shows Embodiment 3 of the present invention. In the third embodiment, an oil supply passage different from the first passage 17 and the second passage 18 is formed in the main body 11 of the pivot member 10B. The oil supply passage includes a hollow space 21 formed inside the main body 11, a substantially horizontal lateral hole 22 that communicates the concave surface of the first passage 17 and the space 21, an upper end of the neck 14, and a space 21, the upper end opening of the vertical hole 23 is arranged to face the depression at the center of the hemispherical concave surface 36 of the bearing portion 35 when the rocker arm 30 is assembled. ing.

  According to the third embodiment, a part of the lubricating oil flowing out from the oil supply passage 87 is accurately supplied to the central portion of the hemispherical concave surface 36 through the first passage 17, the lateral hole 22, the space portion 21 and the vertical hole 23, Since the remaining lubricating oil is supplied to the lower surface of the umbrella portion 37 via the first passage 17 and the second passage 18, the lubricity to the sliding portion between the rocker arm 30 and the pivot member 10 is improved.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) The second passages may be formed at equal intervals in the circumferential direction at four or more locations on the outer peripheral surface of the main body. In some cases, the second passage may be formed only at one place or two places on the outer peripheral surface of the main body.
(2) The pivot member is a lash adjuster that includes a cylindrical body and a plunger that is mounted so as to be movable up and down in the body as long as adverse effects due to air mixing from the second passage can be eliminated. Also good.

DESCRIPTION OF SYMBOLS 10, 10A, 10B ... Pivot member 11 ... Main-body part 17 ... 1st channel | path 18, 18A ... 2nd channel | path 30 ... Rocker arm 32 ... Roller 60 ... Cam 80 ... Cylinder head 83 ... Valve 86 ... Mounting hole 87 ... Oil supply path

Claims (7)

A pivot member that is inserted into the mounting hole of the cylinder head and is rocked by a cam to support a rocker arm that opens and closes the valve, and constitutes a rocking fulcrum of the rocker arm,
On the outer peripheral surface of the main body portion inserted into the mounting hole, a first groove-shaped first passage that goes around the outer peripheral surface and faces an oil supply passage that is opened on the inner peripheral surface of the mounting hole, and the first passage. And a second groove-shaped second passage that extends to the rocker arm side and opens.   The pivot member according to claim 1, wherein a depth of the second passage is shallower than a depth of the first passage, and a groove width of the second passage is narrower than a groove width of the first passage.   3. The pivot member according to claim 1, wherein the second passage is disposed at at least three locations on the outer peripheral surface of the main body portion at equal intervals in the circumferential direction.   The pivot member according to any one of claims 1 to 3, wherein the second passage is formed in a spiral shape on an outer peripheral surface of the main body.   The pivot member according to any one of claims 1 to 4, wherein a cross-sectional shape of the second passage is V-shaped.   6. The pivot member according to claim 1, wherein the pivot member is entirely a single rigid body. A lubricating oil supply structure to a rocker arm that swings on a cam to open and close a valve,
A mounting hole recessed in the cylinder head; and a pivot member that is inserted into the mounting hole and constitutes a rocking fulcrum of the rocker arm. An oil supply passage for lubricating oil is opened on an inner peripheral surface of the mounting hole Formed on the outer peripheral surface of the pivot member, and extends to the entire periphery of the outer peripheral surface, and has a lateral groove-shaped first passage facing the oil supply passage, and on the rocker arm side while intersecting the first passage. A second groove-shaped second passage that extends and opens, and the lubricating oil is supplied to the sliding portion of the rocker arm through the oil supply passage, the first passage, and the second passage sequentially. Lubricating oil supply structure to the rocker arm.

Images