JP2016142148A - Rocker arm - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the assembling workability of a rocker arm.SOLUTION: At one end portion in a length direction of an arm body 12, a valve receiving portion 13 which has an abutting wall 17 and a pair of opposing walls 16 projecting out from both end portions of the abutting portion 17 and opposing to each other is provided. A surface side opposing to the abutting wall 17 of the valve receiving portion 13 is opened as a penetration port 25. The valve receiving portion 13 has an extraction regulating portion 27 formed on the opposite wall 16, and abutting on a head portion 83 of a valve stem 80 to regulate the extraction of the head portion 83 from the penetration port 25; an introduction port 26 crossing and communicating with the penetration port 25 to open at the one end in the length direction of the arm body 12, and introducing the head portion 83 into the valve receiving portion 13; and an advance regulating portion 24 formed at a position opposite to the head portion 83 in an advancing direction, and abutting on the head portion 83 to regulate the further advancing of the head portion 83.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rocker arm.

  The rocker arm disclosed in Patent Document 1 is configured to extend in the length direction as a whole, and has a first end portion at one end portion in the length direction. The first end portion has a main body wall and a pair of guide walls that protrude from both end portions of the main body wall and face each other, and a cap that is attached to the upper end portion of the valve stem is inserted therein. The inner surfaces of both guide walls have a tapered shape that gradually narrows the opening width toward the tip side. Similarly, the peripheral wall of the cap has a tapered shape that gradually narrows toward the tip side. For this reason, when the cap is inserted into the first end portion, the peripheral wall of the cap and the inner surfaces of both guide walls come into contact with each other, and the cap is prevented from coming down from the first end portion.

  By the way, at the time of assembly, one end portion in the length direction of the rocker arm is brought into contact with the upper end portion of the valve stem, and the other end portion in the length direction of the rocker arm is supported by the support member. In this case, the rocker arm is supported at two points of the ball portion of the lash adjuster and the upper end portion of the valve stem, and becomes unstable, so that it is difficult to balance and the rocker arm may fall off the valve stem. However, according to the above configuration, the rocker arm and the valve are integrated with each other by the anti-extraction function of the first end, so that the rocker arm is prevented from falling off.

JP 2012-122372 A

  In the above case, a groove for sliding and mounting the cap is formed in the first end portion so as to penetrate in the direction intersecting the axial direction of the valve stem (the length direction of the rocker arm). For this reason, even when the groove opening at one end in the length direction of the rocker arm is closed with a finger or the like at the time of assembly, the cap may come out from the opening in the groove at the other end in the length direction of the rocker arm. That is, according to the above configuration, there is a situation in which it is difficult to reliably prevent the cap from coming out from the first end side even if the cap can be prevented from coming out downward from the first end portion. It was. Therefore, it has been desired to improve the structure to further enhance the reliability of preventing the rocker arm from falling off.

  The present invention has been completed based on the above circumstances, and an object thereof is to improve the workability of assembling the rocker arm.

  The present invention includes an arm body extending in the length direction, and one end portion in the length direction of the arm body includes a contact wall and a pair of facing walls that protrude from both end portions of the contact wall and face each other. A valve receiving portion is provided, a surface side of the valve receiving portion facing the abutting wall is opened as a through hole, and a shaft portion of the valve stem passes through the through hole and is attached to the tip of the shaft portion. Alternatively, a rocker arm that opens and closes the valve by swinging the arm body in a state where the integrally formed head is inserted into the valve receiving portion and is in contact with the contact wall, The valve receiving portion is formed on the opposing wall, and an extraction restricting portion that restricts the head from coming out of the through hole by contacting the head inserted into the valve receiving portion, and the penetration Crossed into the mouth and said An opening that opens at one end in the longitudinal direction of the main body, and is formed at a position facing an advancing direction of the head that is introduced through the inlet, and an inlet that introduces the head into the valve receiving portion, It has a feature in that it has a progress restricting portion that restricts further progress of the head by contacting the head.

  The head introduced into the valve receiving part through the introduction port is restricted from coming out of the through port by abutting against the withdrawal restriction part, and further abutted against the progression regulation part arranged at a position opposite to the traveling direction. Any further progress is restricted. Therefore, by closing the introduction port with a finger or the like at the time of assembly, it is possible to reliably prevent the head from coming out of the valve receiving portion, and to prevent the rocker arm from falling off the valve stem. As a result, the assembling workability of the rocker arm is improved.

In Example 1 of this invention, it is a figure of the valve operating apparatus incorporating the rocker arm. Similarly, it is sectional drawing of the side view direction which shows the state by which the head of the valve stem was inserted in the valve receiving part of an arm main body. Similarly, it is sectional drawing of the front view direction which shows the state by which the head of the valve stem was inserted in the valve receiving part of an arm main body. Similarly, it is a top view of an arm main part. Similarly, it is a bottom view of the arm body. Similarly, it is a top view of the arm main body before bending a progress control part. Similarly, it is sectional drawing of the arm main body before bending a progress control part. In the rocker arm of Example 2 of this invention, it is sectional drawing of the side view direction at the valve | bulb receiving part side of an arm main body. Similarly, it is a top view of the valve receiver side of the arm body. Similarly, it is a bottom view of the valve receiver side of the arm body. In the rocker arm of Example 3 of this invention, it is sectional drawing of the front view direction which shows the state by which the head of the valve stem was inserted in the valve receiving part of an arm main body. In the rocker arm of Example 4 of this invention, it is a bottom view by the side of the valve receiving part of an arm main body.

Preferred embodiments of the present invention are shown below.
The pair of opposing walls are provided with widening portions that widen the opening width toward the introduction port. According to this, the head is drawn into the expanding portion and smoothly introduced into the valve receiving portion.

  The progress restricting portion is formed by bending the wall plate on the abutting wall side inward, or formed by punching a part of the abutting wall inward. According to this, a progress control part can be formed easily.

  The extraction restricting portion is formed by bending the distal end portion of the opposing wall inward, or is formed by cutting and raising the distal end of the opposing wall inward. According to this, an extraction control part can be formed easily.

<Example 1>
A first embodiment of the present invention will be described with reference to FIGS. The rocker arm 10 according to the first embodiment is incorporated in a valve gear 90 for an internal combustion engine.
First, the valve gear 90 will be described. As shown in FIG. 1, the cylinder head 91 is provided with a ventilation path 92 (intake port or exhaust port), and a stem hole 93 communicating with the ventilation path 92 is provided in the upper surface of the cylinder head 91. Yes.

A valve stem 80 is inserted into the stem hole 93 of the cylinder head 91. The valve stem 80 includes a shaft portion 81 extending in the axial direction (vertical direction), a valve body 82 projecting in a radial direction from the lower end of the shaft portion 81, and a separate head 83 that is attached to the upper end of the shaft portion 81. It consists of. The valve body 82 can be displaced between a valve opening position for opening the air passage 92 and a valve closing position for closing the air passage 92. The valve stem 80 is always biased in the valve closing direction (upward) by the valve spring 85, and the upper end portion of the shaft portion 81 protrudes upward from the upper surface of the cylinder head 91.
The head 83 is a cylindrical cap with the opening surface facing downward, and the upper end portion of the shaft portion 81 is press-fitted and fitted therein.

  An attachment recess 94 is provided on the upper surface of the cylinder head 91 so as to open. A lash adjuster 70 as a support member that supports the rocker arm 10 is fitted and inserted into the mounting recess 94. An oil supply path 95 is provided inside the cylinder head 91, and the oil supply path 95 communicates with the mounting recess 94.

  As shown in FIG. 1, the lash adjuster 70 includes a cylindrical body 71 and a plunger 72 that can move in the body 71 in the vertical direction. When the body 71 is inserted into the mounting recess 94, the upper end portion of the plunger 72 protrudes upward from the upper surface of the cylinder head 91, and the rocker arm 10 is attached to the hemispherical support portion 73 provided at the upper end portion of the plunger 72. The other end (the other end in the length direction of the arm body 12 described later) is slidably supported. The lash adjuster 70 can automatically adjust the support position of the rocker arm 10 by reciprocating the plunger 72 up and down with respect to the body 71 based on the hydraulic pressure of the hydraulic oil supplied from the oil supply passage 95. It is possible.

  A cam 97 provided on the camshaft 96 is disposed above the cylinder head 91. The rocker arm 10 swings following the cam 97 and has a roller 11 that contacts the cam 97 and an arm body 12 that accommodates the roller 11.

  The arm body 12 has a shape extending in the length direction, which is a direction substantially orthogonal to the axial direction of the valve stem 80, and a valve receiving portion 13 positioned at one end portion in the length direction and the other end portion in the length direction. It has the support receiving part 14 located and the roller accommodating part 15 located in the intermediate part of a length direction. In the following description, one end in the length direction is simply one end, and the other end in the length direction is simply the other end.

  The arm body 12 is formed by bending a plate material having a predetermined shape. As shown in FIGS. 4 and 5, the arm main body 12 is disposed between a pair of opposing walls 16 arranged to face each other and the upper ends of the opposing walls 16 at one end. It has an abutment wall 17 that is spanned and a sliding contact wall 18 that is spanned between the upper ends of the opposing walls 16 at the other end. Accordingly, the valve receiving portion 13 is configured by the abutting wall 17 and the pair of opposing walls 16, the support receiving portion 14 is configured by the sliding contact wall 18 and the pair of opposing walls 16, and the roller accommodating portion 15 is the pair of opposing surfaces The wall 16 is formed.

  The roller accommodating portion 15 has an accommodating space 19 in which the roller 11 is accommodated between the opposing walls 16 and between the abutting wall 17 and the sliding contact wall 18. As shown in FIG. 1, the roller 11 is rotatably supported by a shaft member 21 that passes through the shaft holes 20 of both opposing walls 16 while being accommodated in the accommodation space 19.

  As shown in FIG. 1, the support receiving portion 14 can accommodate the support portion 73 of the plunger 72 of the lash adjuster 70 in an inner space defined by the opposing walls 16 and the sliding contact wall 18. The sliding contact wall 18 has a sliding receiving portion 22 that bulges upward in a substantially hemispherical shape along the outer peripheral surface of the support portion 73 of the plunger 72. When the arm main body 12 swings through the roller 11 in accordance with the cam 97, the slide receiving portion 22 slides on the outer peripheral surface of the support portion 73.

  As shown in FIGS. 1 to 3, the valve receiver 13 can accommodate the head portion 83 of the valve stem 80 in an inner space defined by the opposing walls 16 and the abutting wall 17. As shown in FIG. 2, the abutting wall 17 is a strip-shaped pad that is bent downward in the center in the length direction, and the curved inner surface 23 is the head when the arm body 12 is swung. 83 is pressed against the upper end surface of 83.

  As shown in FIGS. 2 and 5, a plate-shaped progress restricting portion 24 is integrally connected and provided at the center in the width direction of the rear end of the contact wall 17. The progression restricting portion 24 is formed by bending a tongue piece 31 (see FIGS. 6 and 7) protruding toward the accommodation space 19 of the roller accommodating portion 15 downward at a substantially right angle. And also abuts against the head 83 in the valve receiver 13 to regulate the head 83 from coming out to the accommodation space 19 side. As shown in FIG. 2, the travel restricting portion 24 is configured to protrude substantially vertically downward from the rear end of the contact wall 17. In the case shown in the figure, the amount of protrusion of the travel restricting portion 24 from the contact wall 17 is smaller than the wall thickness of the contact wall 17.

  As shown in FIGS. 2 and 5, the valve receiving portion 13 is opened downward (in the axial direction of the valve stem 80) between the lower ends of the opposing walls 16 and on the lower surface side facing the inner surface of the abutting wall 17. The through-hole 25 is provided. The upper end portion of the valve stem 80 is disposed through the through hole 25 of the valve receiving portion 13. The opening width of the through-hole 25 is narrower than the upper space in the valve receiving portion 13 by a pair of extraction restriction portions 27 described later.

  Further, the valve receiver 13 has an inlet 26 that is open to one end side (a direction intersecting the axial direction of the valve stem 80) on one end face side facing the progress restricting portion 24. The inlet 26 of the valve receiver 13 communicates with the through-hole 25 at a substantially right angle, and is defined by one end edges of the opposing walls 16 and the abutting wall 17.

  As shown in FIG. 3, a pair of extraction restricting portions 27 is provided at the lower end portions of the opposing walls 16. Both extraction restricting portions 27 are formed by bending the lower end portions of the opposing walls 16 inwardly at an obtuse angle and gradually approaching each other toward the lower end. As shown in FIG. 2, both extraction restricting portions 27 are formed in the longitudinal direction over the range from the rear end portion of the roller accommodating portion 15 to the front end portion of the valve receiving portion 13 at the lower end portions of the opposing walls 16. It has a form that extends.

  As shown in FIG. 5, a taper-shaped widened portion 28 that gradually widens the opening width toward one end is provided on the inner surface of one end of each of the opposing walls 16. The expanding portion 28 is formed by crushing the inner surfaces of one end portions of the opposing walls 16 in the valve receiving portion 13 with a press die. Here, the opposing walls 16 are configured such that the wall thickness gradually decreases toward one end by the widened portion 28. In addition, the opening width of the introduction port 26 is expanded by the expanding portion 28 more than the opening width on the other end side of the opposing walls 16 in the valve receiving portion 13. As shown in FIG. 2, the expanded portion 28 is formed over substantially the entire height of the opposing walls 16.

Next, a method for assembling the rocker arm 10 to the valve gear 90 will be described.
At the time of assembly, the head 83 is inserted into the valve receiver 13 of the rocker arm 10 through the inlet 26. At the start of insertion, the head 83 is smoothly inserted into the valve receiving portion 13 by being drawn into the expanding portion 28. Further, in the insertion process, the head 83 is positioned and sandwiched between the contact wall 17 and the both extraction restricting portions 27, and both end edges in the width direction of the lower end of the head 83 are formed on the two extraction restricting portions 27. The inner surface is slid and guided into the valve receiver 13.

  Here, if the head 83 is deeply pushed in the traveling direction toward the roller accommodating portion 15, the central portion in the width direction of the upper end of the head 83 abuts against the travel restricting portion 24 that faces in the traveling direction, Further progression of the head 83 is prevented. Therefore, it is possible to prevent the head 83 from slipping out into the storage space 19 of the roller storage portion 15. Further, the head 83 inserted into the valve receiving portion 13 is supported by the two extraction restricting portions 27, thereby preventing the head 83 from falling downward from the through-hole 25 (see FIG. 3).

  Subsequently, the rocker arm 10 assembled with the head portion 83 is placed on the upper end of the shaft portion 81 of the valve stem 80. At this time, the upper end portion of the shaft portion 81 is inserted into the head portion 83 in a press-fit state while closing the introduction port 26 of the valve receiving portion 13 with a finger. If the introduction port 26 is closed in this way, the head 83 is reliably held in the valve receiving portion 13 by the extraction restricting portion 27 and the travel restricting portion 24, so that the rocker arm 10 is connected to the shaft portion. No drop off from 81. Further, since the head 83 is slidable in the length direction of the arm main body 12 in the valve receiving portion 13, it is possible to finely adjust the mounting position of the rocker arm 10 with respect to the valve stem 80.

  Next, the sliding contact wall 18 of the support receiving portion 14 of the rocker arm 10 is placed on the support portion 73 of the plunger 72 of the lash adjuster 70. During this time, although the roller 11 comes into contact with the cam 97 and the rocker arm 10 is pressed downward, the support state of the valve receiving portion 13 with respect to the valve stem 80 is kept stable at one end. 10 is reliably prevented from falling off.

  As described above, according to the first embodiment, when assembling, the head 83 of the valve stem 80 abuts against the extraction restricting portion 27, so that the withdrawal from the through hole 25 is restricted and the progression restricting portion 24. Since the advancing of the head 83 toward the roller accommodating portion 15 is restricted by the contact, the head 83 can be prevented from coming out of the valve receiving portion 13 by closing the inlet 26 with a finger or the like. As a result, the rocker arm 10 can be prevented from falling off the valve stem 80. As a result, the workability of assembling the rocker arm 10 is improved.

  Further, since the head 83 is smoothly drawn and inserted into the valve receiving portion 13 by the widened portions 28 provided on the opposing walls 16, the assembling workability is further improved. Furthermore, since the extraction restricting portion 27 and the progress restricting portion 24 are integrally formed from a plate material for forming the arm main body 12 by bending, it is easy to form and can be manufactured at low cost.

<Example 2>
A second embodiment of the present invention will be described with reference to FIGS. The structure of the second embodiment is different from the first embodiment in the form of the progress restricting portion 24A, but the structure other than the progress restricting portion 24A is substantially the same as that of the first embodiment. Therefore, in the following description, the same or corresponding structures as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and the description overlapping with the first embodiment is omitted.

  The progression restricting portion 24 </ b> A is provided on the abutting wall 17 of the valve receiving portion 13 of the arm body 12. Specifically, the travel restricting portion 24A is formed by a protruding portion that is squeezed and protruded toward the inner surface side of the abutting wall 17 by driving the center portion in the width direction of the rear end portion of the abutting wall 17 with a press pin from the outside. It is configured. Therefore, the progression restricting portion 24 </ b> A is only partially provided in the center portion in the width direction of the rear end portion of the contact wall 17. At the time of assembly, the central portion in the width direction at the upper end of the head 83 is brought into contact with the travel restricting portion 24A, so that the head 83 is prevented from coming out to the roller accommodating portion 15 side. According to the second embodiment, similarly to the first embodiment, the progress restricting portion 24A can be easily formed from the plate material for forming the arm main body 12.

<Example 3>
A third embodiment of the present invention will be described with reference to FIG. The structure of the third embodiment is different from the first embodiment in the form of the extraction restricting portion 27A, but the structure other than the extraction restricting portion 27A is substantially the same as that of the first embodiment. Therefore, in the following description, the same or corresponding structures as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and the description overlapping with the first embodiment is omitted.

  The extraction restricting portion 27A is formed by cutting and raising the lower ends of the opposing walls 16 inward. Specifically, the extraction restricting portion 27 </ b> A is driven by pressing a press blade along the length direction of the arm body 12 into a substantially central portion in the thickness direction of the lower end surfaces of the opposing walls 16. It is formed with a stamped groove 29 having a substantially V-shaped cross section formed on the lower end surface. The both ends of the lower end of the head 83 in the width direction are supported by the both extraction restricting portions 27A by the extraction restricting portion 27A, so that the head 83 is prevented from coming out from the through hole 25. This is the same as in the first embodiment. Also in the third embodiment, it is possible to easily form both extraction restricting portions 27A from the plate material for forming the arm main body 12.

<Example 4>
A fourth embodiment of the present invention will be described with reference to FIG. In the fourth embodiment, the configuration of the expanded portion 28A is different from that of the first embodiment, but the structure other than the expanded portion 28A is the same as that of the first embodiment. Therefore, in the following description, the same or corresponding structures as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and the description overlapping with the first embodiment is omitted.

  As in the first embodiment, the expanding portion 28A is provided on the inner surface of one end portion of both opposing walls 16 in the valve receiving portion 13, and is formed by crushing the inner surface of one end portion of both opposing walls 16 with a press die. . The expanded portion 28A has a tapered first expanded portion 28AB that gradually expands toward one end, and a second expanded portion 28AC that opens at substantially the same width from the first expanded portion 28AB toward one end. It consists of and. The opening width of the introduction port 26 is expanded by the second expansion portion 28AC from the first expansion portion 28AB side.

  In the case of the fourth embodiment, at the time of assembly, the head 83 is temporarily fixed in a state of being substantially positioned in the second expanded portion 28AC, and then the valve receiving portion is guided while the head 83 is guided by the second expanded portion 28AC. Since it can be slid into 13 and moved, assembly workability becomes better.

<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 head portion of the valve stem may be provided integrally and continuously with the shaft portion.
(2) The extraction restricting portion may be provided on only one of the opposing walls.
(3) The support member that supports the other end of the rocker arm in the length direction may be a pivot that does not have a valve clearance automatic adjustment function, instead of a lash adjuster.
(4) At the time of assembly, the inlet may be closed with a jig instead of a finger.
(5) The extraction restricting portion and the progress restricting portion may be formed integrally with the arm body by casting or forging.

DESCRIPTION OF SYMBOLS 10 ... Rocker arm 11 ... Roller 12 ... Arm main body 13 ... Valve receiving part 16 ... Opposite wall 17 ... Abutting wall 24, 24A ... Progress restriction part 25 ... Through-hole 26 ... Inlet 27, 27A ... Extraction restriction part 28, 28A ... Expanded part 80 ... Valve stem 81 ... Shaft part 83 ... Head 91 ... Cylinder head

Claims (4)

It has an arm body that extends in the length direction,
One end portion of the arm body in the length direction is provided with a valve receiving portion having a contact wall and a pair of opposing walls protruding from both end portions of the contact wall and facing each other. The surface side facing the abutment wall is opened as a through hole,
In a state where the shaft portion of the valve stem passes through the through-hole, the head that is crowned or integrally formed at the tip of the shaft portion is inserted into the valve receiving portion and is in contact with the contact wall, A rocker arm that opens and closes a valve by swinging the arm body,
The valve receiver is
An extraction restricting portion that is formed on the opposing wall and restricts the head from coming out of the through-hole by contacting the head inserted into the valve receiving portion;
An introduction port that communicates with the through-hole and opens at one end in the length direction of the arm body, and introduces the head into the valve receiving portion;
It has a progress restricting portion that is formed at a position opposite to the traveling direction of the head introduced through the introduction port and regulates further progression of the head by contacting the head. Rocker arm that features.   2. The rocker arm according to claim 1, wherein the pair of opposing walls are provided with an expanding portion that increases an opening width toward the introduction port.   3. The progress restricting portion is formed by bending a wall plate on the abutting wall side inward, or formed by punching a part of the abutting wall inward. The rocker arm described.   4. The pull-out restricting portion is formed by bending the tip of the opposing wall inward, or formed by cutting and raising the tip of the opposing wall inward. A rocker arm according to claim 1.

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