JP6043665B2 - Rocker arm - Google Patents

Description

  The present invention relates to a rocker arm.

  The rocker arm disclosed in Patent Document 1 is swingably supported by a rocker shaft, and is provided with a valve abutting portion that abuts the upper end of the valve at one end and the upper end of the push rod at the other end. An adjustment screw that contacts the screw is screwed. When the push rod moves up and down due to the rotation of the cam, the rocker arm is swung with the rocker shaft as a fulcrum, and the valve opens and closes via the valve contact portion. An oil supply groove communicating with the shaft oil supply port of the rocker shaft is formed on the outer peripheral surface of the adjustment screw toward the upper end portion of the push rod. As a result, the lubricating oil is supplied from the shaft oil supply port of the rocker shaft to the upper end portion of the push rod via the oil supply groove.

JP 2008-128151 A

  By the way, in place of the adjusting screw, a support member capable of coming into contact with the upper end of the push rod is inserted into the recess provided at the other end of the rocker arm, and the same oil supply groove is formed on the outer peripheral surface of the support member. Even if it does, it becomes possible to supply lubricating oil to the upper end part of a push rod. However, in this case, there is a concern that the outlet of the oil supply groove does not stop at the target position with respect to the sliding area with the push rod because the support member rotates in the recess. In particular, in the case of a V-type engine whose cylinder is open in a V-shape, the support member is inclined with respect to the vertical direction by the V bank, so that the outlet of the oil groove is located at the lower end in the inclined direction. Further, there is a problem that the lubricating oil may fall as it is without reaching the upper end portion of the push rod, and the reliability of lubrication is lacking.

  The present invention has been completed based on the above circumstances, and an object thereof is to provide a rocker arm with improved lubrication reliability.

The present invention is a rocker arm that swings by a cam to open and close a valve, and has an arm main body having a recess opening downward, and a receiving member that is rotatably inserted into the recess and disposed below. And a support member having a sliding portion that is movably supported, and at least one of an outer peripheral surface of the support member and an inner peripheral surface of the recess is supplied with lubricating oil from above with respect to the sliding portion. An oil supply passage is provided, and the arm body has a retaining ring that prevents the supporting member from coming off by contacting the stepped portion above the sliding portion of the outer peripheral surface of the supporting member. attached to said retaining ring, above the sliding part, and around the outer peripheral surface of the support member, and受油portion for receiving the lubricating oil from the oil supply passage, the sliding said lubricant The oil guide section leading to the section is the circumferential direction Characterized in place are provided divided.

Lubricating oil from the oil supply passage is once received by the oil receiving part, and after being held around the outer periphery of the support member by its surface tension, it can reach the sliding part through the oil guiding part. Lubrication reliability is improved. Since the retaining ring has both the function of retaining the support member and the function of improving the lubricity of the sliding part, the number of parts can be reduced compared to the case where both functions are provided on separate members. And the entire configuration can be simplified.

1 is an overall view of an internal combustion engine including a rocker arm according to a first embodiment of the present invention. It is an expanded sectional view of the one end side of a rocker arm. It is a bottom view of the one end side of a rocker arm. It is a bottom view of the one end side of the rocker arm of Example 2. 6 is an enlarged cross-sectional view of a main part on one end side of a rocker arm according to Embodiment 3. FIG.

Preferred embodiments of the present invention are shown below .

  A plurality of the oil guiding portions and the oil receiving portions are provided alternately in the circumferential direction. Thereby, the retention property of lubricating oil can be adjusted according to the number and formation position of an oil guide part and an oil receiving part. In addition, when the oil guiding portion and the oil receiving portion are provided at equal intervals in the circumferential direction, the directivity with respect to the circumferential direction can be eliminated, so that the assembly workability is improved.

  The oil guiding portion is provided only at one place in the circumferential direction. Thereby, it can arrange | position to the position which aimed the oil guide part with respect to the sliding part, and can eliminate the waste of lubrication with respect to a sliding part.

  The support member and the recess are inclined with respect to the vertical direction. With such a structure, the lubricating oil may not reach the sliding portion, so that the oil receiving portion and the oil guiding portion can sufficiently receive the lubricating oil to the sliding portion. can do.

<Example 1>
A first embodiment of the present invention will be described with reference to FIGS.
The internal combustion engine to which the first embodiment is applied is a V-type engine in which cylinders are arranged in a left and right V shape, and an OHV system is adopted as a valve operating system. Moreover, in FIG. 1, only one side of the one side cylinder row is shown.

  As shown in FIG. 1, a port portion 61 (intake port or exhaust port) is formed in the cylinder head 60, and a stem hole 62 communicates with the port portion 61. The stem hole 62 incorporates a valve 63 that can open and close the intake port or the exhaust port of the port portion 61. The valve stem 64 of the valve 63 protrudes from the stem hole 62, and a valve spring 65 is attached to the protruding portion to urge the valve 63 in the valve closing direction.

  The rocker arm 10 is disposed on the cylinder head 60. The rocker arm 10 includes an arm body 11 that is elongated in the length direction. A bearing hole 12 is formed through the substantially central portion of the arm body 11 in the length direction. A rocker shaft 70 is inserted into the bearing hole 12, and the arm body 11 can swing in a seesaw shape around the rocker shaft 70. A valve abutting portion 13 that abuts the upper end of the valve stem 64 is bent slightly downward at one end in the length direction of the arm main body 11, and a push rod is provided at the other end in the length direction of the arm main body 11. A separate pivot 90 (support member) that abuts the upper end of 80 (receiving member) is provided.

  In addition, a shaft oil supply hole 71 is formed in the central portion of the rocker shaft 70 so as to extend in the axial direction, and an in-arm oil supply hole 14 communicating with the shaft oil supply hole 71 is formed at the other longitudinal end of the arm body 11. Is formed. The in-arm oil supply hole 14 extends from a communication position with the shaft oil supply hole 71 to an upper end portion of a recessed portion 16 described later, and the extended end communicates with the recessed portion 16.

  At the upper end of the push rod 80, a concave spherical receiving rod 81 opened upward is provided. A pivot 90 is supported on the receiving rod 81. The push rod 80 is disposed on the side of the cylinder block 66, and a hydraulic tappet 69 is slidably inserted into a cylindrical holder 68 formed integrally with an outer holder plate 67. The upper end of the hydraulic tappet 69 is in contact with the lower end of the push rod 80, and the lower end of the hydraulic tappet 69 is slidably in contact with the outer peripheral surface of the cam 50 provided on the camshaft 51.

  Here, when the push rod 80 is lifted together with the hydraulic tappet 69 by the rotation of the cam 50, the other longitudinal end of the arm body 11 is also lifted through the pivot 90, and the arm body 11 swings around the rocker shaft 70. Then, the valve contact portion 13 depresses the valve stem 64 against the urging force of the valve spring 65, and the valve 63 is opened. On the other hand, when the push rod 80 is lowered, the other end portion in the length direction of the arm body 11 is lowered through the pivot 90, the arm body 11 is swung around the rocker shaft 70, and the valve contact portion 13 is moved to the valve. The valve 65 is lifted by the urging force of the spring 65, and the valve 63 is closed.

Next, the pivot 90 of the rocker arm 10 and its peripheral structure will be specifically described.
As shown in FIG. 2, the pivot 90 includes a substantially cylindrical pivot body 91. A hollow portion 92 is formed at the center of the pivot body 91 so as to open at the upper end. A lid portion 93 is attached to the upper end of the pivot main body 91, and the hollow portion 92 can be filled with oil through a through hole 94 formed in the lid portion 93.
The outer peripheral surface of the pivot main body 91 is disposed above the stepped portion 95, the stepped portion 95 disposed on the lower end side, the substantially hemispherical sliding portion 96 disposed below the stepped portion 95, and the stepped portion 95. And a circumferential surface portion 97 having a circumferential surface shape. A sliding region 98 that can slide on the receiving rod 81 of the push rod 80 is formed below the sliding portion 96.

  The peripheral surface portion 97 of the pivot body 91 is formed to have a larger diameter than the sliding portion 96 through the step portion 95. In this case, the stepped portion 95 has a tapered shape that gradually increases in diameter from the sliding portion 96 toward the peripheral surface portion 97. In addition, an oil supply passage 99 extending in a spiral shape around the axis is formed on the peripheral surface portion 97 of the pivot body 91 from the upper end side to the lower end continuous with the stepped portion 95. The oil supply passage 99 is formed to have a concave U-shaped or V-shaped cross section at the peripheral surface portion 97.

  At the other end in the length direction of the arm main body 11, a bottomed recess 16 that opens to the lower surface of the arm main body 11 is formed. A pivot 90 is inserted into the recess 16 so as to be rotatable about an axis. As shown in FIG. 2, when the pivot 90 is inserted into the concave portion 16, the peripheral surface portion 97 is disposed so as to be able to contact the inner peripheral surface of the concave portion 16, and the outer opening of the oil supply passage 99 is substantially blocked by the arm body 11. It will be in the state.

  A cylindrical boss portion 17 protrudes from the lower surface of the arm body 11 on the outer peripheral portion of the opening edge of the recess 16. An annular locking groove 18 is formed on the outer peripheral surface of the boss portion 17, and a retaining ring 30 is fixed to the locking groove 18 by caulking. When the pivot 90 is properly inserted into the concave portion 16, the step portion 95 is disposed to face the inner peripheral surface of the boss portion 17, and the retaining ring 30 abuts against the step portion 95, whereby the pivot 90 Is prevented from coming out of the recess 16.

  Here, the retaining ring 30 has a metal plate shape, and includes an annular ring body 31 (see FIG. 3) and a caulking portion 32 that rises from the outer peripheral edge of the ring body 31. The ring body 31 is disposed so as to be able to contact the lower end surface of the boss portion 17, and the caulking portion 32 is bent toward the inner peripheral side by caulking and is latched to the locking groove 18 of the boss portion 17. ing.

  Further, as shown in FIG. 3, the inner peripheral edge of the ring body 31 is moved away from the sliding portion 96 to a position facing the lower end of the sliding portion 96 in a state where the pivot 90 is prevented from coming off in the recess 16. An oil guide portion 33 having a shape and an oil receiving portion 34 having a shape approaching the sliding portion 96 are provided separately in the circumferential direction. In the case of the first embodiment, a plurality of oil guiding portions 33 and oil receiving portions 34 are alternately arranged at equal intervals in the circumferential direction. In short, a plurality of oil guide portions 33 are formed in the inner peripheral edge of the ring body 31 so that the oil receiving portions 34 are positioned between the oil guide portions 33. Further, in plan view and bottom view, the oil guiding portion 33 is edged with a curve to form a concave arc shape, and the oil receiving portion 34 is edged with a curve to form a convex arc shape. The inner end (protruding end) of the oil receiving portion 34 is arranged close to a position where it can come into contact with the sliding portion 96 when the pivot 90 is prevented from coming off. Further, as shown in FIG. 2, the substantially triangular space defined by the inner peripheral surface of the concave portion 16, the slope portion of the stepped portion 95, and the upper surface of the oil receiving portion 34 communicates with the outlet of the oil supply passage 99 above. Thus, it is configured as an oil reservoir space 40 in which oil (lubricating oil) from the oil supply passage 99 can be retained.

Next, an oil supply structure that supplies oil to the sliding region 98 of the sliding portion 96 of the pivot 90 will be described.
As shown in FIG. 2, the oil supply structure includes a shaft oil supply hole 71, an arm oil supply hole 14, an oil supply path 99 of a pivot 90 in the recess 16, an oil receiving part 34, and an oil guide part 33. Yes. The oil flows from the shaft oil supply hole 71 into the recess 16 through the arm oil supply hole 14, then flows through the oil supply path 99, and further flows out from the outlet of the oil supply path 99 to be received by the oil receiving part 34 and guided. The oil reaches the sliding portion 96 through the oil portion 33 and lubricates the sliding region 98 from the upper end side of the sliding portion 96. In this case, the oil is once received by the oil receiving portion 34 and stored in the oil reservoir space 40, and in this state, the oil can reach the sliding portion 96 through the oil guide portion 33. For this reason, the oil reaches the entire sliding portion 96 more uniformly than the oil directly flows from the oil guiding portion 33 to the sliding portion 96.

  In particular, since the formation direction of the pivot 90 and the concave portion 16 is inclined along the V bank, if the oil guiding portion 33 is positioned at the lower end in the inclination direction due to the rotation of the pivot 90, the oil slides. There is also a possibility that the moving part 96 is dropped without being lubricated. However, in the case of Example 1, in addition to the plurality of oil guiding portions 33 provided in the circumferential direction, the oil receiving portion 34 once receives the oil and stores it in the oil sump space 40, and then the oil guiding portion Therefore, the sliding region 98 of the sliding portion 96 can be reliably lubricated via the oil guiding portion 33.

  As described above, according to the first embodiment, the oil can be reliably brought to the sliding region 98 of the sliding portion 96 by the oil guiding portion 33 and the oil receiving portion 34, Lubrication reliability can be improved.

  Further, since the oil guiding portion 33 and the oil receiving portion 34 are provided in the retaining ring 30, the retaining ring 30 has a function of retaining the pivot 90 and a function of improving the lubricity of the sliding portion 96. Can be combined. Therefore, the number of parts can be reduced and the overall configuration can be simplified as compared with the case where both functions are provided in separate members.

  Furthermore, since the oil guide portions 33 and the oil receiving portions 34 are alternately provided in the circumferential direction at equal intervals, the circumferential directionality of the retaining ring 30 is lost. As a result, when assembling the retaining ring 30 to the arm body 11, it is not necessary to strictly distinguish the orientation of the retaining ring 30, and the assembly workability is improved.

<Example 2>
FIG. 4 shows a rocker arm 10A according to the second embodiment of the present invention.
In the case of the second embodiment, only one oil guiding portion 33A is provided on the inner peripheral edge of the ring main body 31A of the retaining ring 30A. Specifically, the oil guide portion 33A is configured in a form that is cut out in a concave arc shape on the inner peripheral edge of the ring main body 31A. Further, a portion of the inner periphery of the ring main body 31A excluding the oil guiding portion 33A is an oil receiving portion 34A that is continuous in the circumferential direction. In a state where the pivot 90 is prevented from being detached by the retaining ring 30 </ b> A, the oil receiving portion 34 </ b> A is arranged around the sliding portion 96.

  In the case of the V bank, when the retaining ring 30A is assembled to the arm body 11, if the oil guiding portion 33A is positioned on the upper end side in the inclination direction of the pivot 90, the oil from the oil supply passage 99 is transferred to the oil guiding portion 33A. After being collected, it reaches the upper end side in the gravitational direction of the sliding portion 96 through the oil guiding portion 33A, and slides down from the upper end side in the gravitational direction so that the entire sliding portion 96 is evenly distributed. Therefore, according to the second embodiment, by restricting the assembly direction of the retaining ring 30A, oil can be supplied to the target position (the upper end side in the gravity direction of the sliding portion 96) without waste.

<Example 3>
FIG. 5 shows a rocker arm 10B according to the third embodiment of the present invention.
In the case of the third embodiment, the boss portion 17 is omitted from the arm main body 11B of the rocker arm 10B, and an annular retaining groove 19 is formed on the inner peripheral surface opening side of the concave portion 16B of the arm main body 11B.

  The retaining ring 30B is configured as a C-ring, and an oil guiding portion 33B is provided in a notch portion penetrating the inner and outer periphery, and an oil receiving portion 34B is provided in a portion other than the oil guiding portion 33B. The retaining ring 30B is inserted into the recess 16B from below the arm body 11B, and is elastically fitted into the retaining groove 19 from the inside, so that the retaining ring 30B is held in the recess 16B and the pivot 90 Is kept in a retaining state. According to the third embodiment, the retaining ring 30B can be easily attached to the arm main body 11B.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following aspects are also included in the technical scope of the present invention.
(1) The oil supply path may be formed not on the outer peripheral surface of the pivot but on the inner peripheral surface of the recess of the arm body.
(2) The direction in which the pivot and the recess are formed may be arranged along the vertical direction (gravity direction).
(3) Instead of the pivot, a lash adjuster having a plunger that moves up and down by hydraulic pressure with respect to the cylindrical body may be inserted into the recess.
(4) In the plan view and the bottom view, the oil guide portion may be formed in an angular concave shape, and the oil receiving portion may be formed in an angular convex shape.
(5) The oil supply path does not need to be spirally extended on at least one of the outer peripheral surface of the pivot (or lash adjuster) and the inner peripheral surface of the recess of the arm main body, and is, for example, a linearly extended shape. Alternatively, it may be meandering and extending.

DESCRIPTION OF SYMBOLS 10, 10A, 10B ... Rocker arm 11, 11B ... Arm main body 16, 16B ... Recess 30, 30, A, 30B ... Retaining member 33, 33A, 33B ... Oil guide part 34, 34A, 34B ... Oil receiving part 63 ... Valve 70 ... Rocker shaft 80 ... Push rod (receiving member)
90 ... Pivot (support member)
95 ... Step part (step part)
96 ... sliding part 99 ... oil supply passage

Claims (4)

A rocker arm that is swung by a cam to open and close a valve,
An arm body having a recess opening downward;
A support member having a sliding portion that is rotatably inserted into the recess and is slidably supported by a receiving member disposed below;
At least one of the outer peripheral surface of the support member and the inner peripheral surface of the recess is provided with an oil supply passage for supplying lubricating oil from above to the sliding portion,
The arm main body is attached with a retaining ring that prevents the supporting member from coming off by contacting the stepped portion above the sliding portion of the outer peripheral surface of the supporting member.
The retaining ring is above the sliding part, and around the outer peripheral surface of the support member, and受油portion for receiving the lubricating oil from the oil supply passage, guiding the lubricating oil to the sliding portion A rocker arm, wherein the oil guide portion is provided by being divided in the circumferential direction. The rocker arm according to claim 1, wherein a plurality of the oil guiding portions and the oil receiving portions are provided alternately in the circumferential direction . The oil guide portion, the circumferential direction of claim 1 Symbol mounting of the rocker arm can be characterized is provided on only one place. The rocker arm according to any one of claims 1 to 3, wherein the support member and the concave portion are inclined with respect to the vertical direction.

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