JP4608473B2 - Power transmission parts used in valve opening / closing mechanisms - Google Patents

Description

  The present invention relates to a power transmission component used for a valve opening / closing mechanism of an engine.

A valve opening / closing mechanism used in a reciprocating engine such as an automobile is configured to perform intake / exhaust by combustion of the engine by opening / closing a valve for intake or exhaust by swinging a rocker arm in response to rotation of a cam. Has been.
For example, in an OHC (overhead cam) type engine, a rocker arm as a power transmission component is configured such that a roller is supported by a support pin between a pair of support walls. The rocker arm swings while the roller is driven to rotate as the cam rotates, and slides the valve to open and close the intake and exhaust ports of the engine.

  Moreover, as a cam follower in which the roller is disposed on a pair of support walls via a support pin, for example, there is one disclosed in Patent Document 1. In this cam follower, a hollow support pin is penetrated and fixed to a bifurcated portion at the tip of an arm, and a roller is supported on the support pin in a freely rolling manner via a needle bearing. In addition, in the spindle pin, the raceway surface of the needle bearing is hardened, and recesses that can be plastically deformed are formed on the outer periphery of both ends of the uncured state, and both ends are formed at the edge of the pin hole of the bifurcated portion. It is fixed by caulking. This prevents the pivot pin from falling off and prevents deformation of the hardened portion at the center of the pivot pin.

Further, in the cam follower of Patent Document 2, shaft attachment holes are formed in a pair of opposing side wall portions of the body, and both ends of the support shaft are connected to each other via thermal expansion rings that are externally mounted on the outer peripheral surfaces of the press-fitting sites at both ends of the support shaft. It is press-fitted into the shaft mounting hole. Thereby, it is prevented that the retaining force of the support shaft decreases.
However, in order to stably improve the caulking characteristics such as the load and rotational torque of the support pins on the pair of support walls in a simple manner, further ingenuity is required.

Japanese Utility Model Publication No. 6-25503 JP 2003-286810 A

  The present invention has been made in view of such conventional problems, and intends to provide a power transmission component used for a valve opening / closing mechanism capable of improving the caulking characteristics of a support pin with respect to a pair of support walls by a simple device. To do.

The present invention is used in a valve opening / closing mechanism in an engine, and in a power transmission component in which a roller is supported by a support pin between a pair of support walls.
Each of the pair of support walls is formed with through holes penetrating the pair of support walls on the same line.
The through hole is punched with a punch to form a sheared surface portion on the punching side, and a fracture surface portion is formed on the opposite side to the punching side.
The support pin is formed by caulking recesses in the axial end surfaces thereof with the insertion end portions of the both ends inserted and disposed in the through holes, so that the outer peripheral surface of the insertion end portion is formed in the through hole. The power transmission component used in the valve opening / closing mechanism is characterized in that both the shearing surface portion and the fractured surface portion are continuously deformed and fixed to the support wall by caulking (Claim 1).

  In the power transmission component of the present invention, by punching through holes in the pair of support walls with a punch, a shear surface portion and a fracture surface portion are formed in the through holes. When the support pin with the roller mounted is caulked and fixed to the pair of support walls, the pair of insertion end portions of the support pin are inserted and disposed in the respective through holes, and the outer peripheral surfaces of the pair of insertion end portions are arranged. These are opposed to the shearing surface portion and the fracture surface portion in the through hole, respectively. In this state, a caulking recess is formed in the axial end surface of the insertion end portion so that the outer peripheral surface of the insertion end portion is continuously deformed to both the shear surface portion and the fracture surface portion of the through hole.

As a result, the parallelism of the support pins (parallelism with respect to the through-hole formation direction) can be stabilized by the shearing surface portion, and the caulking characteristics such as the removal load of the support pins and the rotational torque can be improved by the fracture surface portion. Further, the improvement of the caulking characteristics can be performed by a simple device using a shearing surface portion and a fractured surface portion formed in the through hole by punching out the through hole in the pair of support walls with a punch.
Therefore, according to the power transmission component of the present invention, it is possible to improve the caulking characteristics such as the removal load of the support pins and the rotational torque with respect to the pair of support walls by a simple device.

A preferred embodiment of the present invention described above will be described.
In the present invention, the through hole has the shear surface portion in the outer portion of the through hole by punching from the outer surface of the support wall by the punch, and has the fracture surface portion in the inner portion of the through hole. The fractured surface portion is formed with a diameter increasing toward the inner side surface of the support wall, and the support pin deforms the distal end side portion of the insertion end portion into the shear surface portion and A portion closer to the base end side than the side portion can be deformed into the fracture surface portion and can be caulked and fixed to the support wall.

  In this case, the distal end portion of the insertion end portion of the support pin is deformed to the shear surface portion, the parallelism of the support pin is stabilized, and the proximal end portion of the support pin portion is deformed to the fracture surface portion. The caulking characteristics of the support pin can be improved.

  Further, the through hole has the shearing surface portion in the inner portion of the through hole by punching out from the inner surface of the support wall by the punch, and has the fracture surface portion in the outer portion of the through hole. The fracture surface portion is formed with a diameter increasing toward the outer surface of the support wall, and the support pin deforms the distal end side portion of the insertion end portion into the fracture surface portion, and the distal end side portion. Further, the base end side portion can be deformed into the shear surface portion and can be caulked and fixed to the support wall (claim 3).

  In this case, the distal end portion of the insertion end portion of the support pin is deformed into a fractured surface portion to improve the caulking characteristics of the support pin, and the proximal end portion of the support pin portion is deformed into a shear surface portion. The parallelism of the support pins can be stabilized.

The power transmission component may be a rocker arm used for an OHC type engine or a roller tappet used for an OHV type engine.
In this case, in the rocker arm or the roller tappet, the caulking characteristics of the support pins with respect to the pair of support walls can be improved with a simple device.

Hereinafter, embodiments of a power transmission component used in the valve opening / closing mechanism of the present invention will be described with reference to the drawings.
As shown in FIGS. 2 and 5, the power transmission component 1 used in the valve opening / closing mechanism 6 of this example is used for the valve opening / closing mechanism 6 in an engine (reciprocating engine), and is supported by a support pin 3 between a pair of support walls 21. The roller 4 is supported. The power transmission component 1 of this example is a rocker arm 1 used for an OHC reciprocating engine.

  As shown in FIGS. 1, 3, and 4, the pair of support walls 21 are formed with through holes 22 that penetrate the pair of support walls 21 on the same line. The through hole 22 is punched with a punch to form a shearing surface portion 221 on the punching side and a fracture surface portion 222 on the opposite side to the punching side. Then, as shown in FIG. 1, the support pin 3 is formed by caulking recesses 32 in the axial end surfaces 311 with the insertion end portions 31 at both ends inserted and disposed in the respective through holes 22. The outer peripheral surface 312 of the insertion end portion 31 is deformed continuously to both the shearing surface portion 221 and the fractured surface portion 222 in the through hole 22 and fixed to the support wall 21 by caulking.

Hereinafter, the rocker arm 1 used in the valve opening / closing mechanism 6 of this example will be described in detail with reference to FIGS.
As shown in FIG. 5, the valve opening / closing mechanism 6 of this example includes a rotation of a valve 63 disposed at an intake / exhaust port (intake port or exhaust port) 60 of an engine and a cam 62 provided at an engine camshaft 61. And rocker arm 1 that swings and opens and closes valve 63 by sliding, and coil spring 64 that biases valve 63 in the closing direction.

As shown in FIGS. 2 to 4, the rocker arm 1 of this example has a rocker arm main body 2 and a roller 4 disposed on the rocker arm main body 2 via a support pin 3. The rocker arm body 2 has a pair of support walls 21 formed so as to be opposed to each other by bending a flat plate, and a first connection portion 23 and a second connection portion 24 that connect the pair of support walls 21.
As shown in FIG. 5, in the valve opening / closing mechanism 6, the first connecting portion 23 in the rocker arm main body 2 is engaged with the valve stem portion 631 of the valve 63, and the second connecting portion 24 in the rocker arm main body 2 is The rocker arm 1 is engaged with a pivot 65 that forms the swing center.

As shown in FIGS. 4 and 5, the roller 4 disposed on the rocker arm body 2 has an outer peripheral surface in contact with an outer peripheral surface of a cam 62 disposed on the camshaft 61 of the engine. The roller 4 includes a bearing portion 41 disposed on the inner peripheral portion thereof and a roller main body portion 42 disposed on the outer periphery of the bearing portion 41. The bearing portion 41 of this example is a cylindrical roller bearing in which a plurality of cylindrical rollers are disposed.
The rocker arm 1 is configured such that, as the cam 62 rotates, the roller 4 is driven to rotate and swings about the pivot 65 to open and close the valve 63.

  In addition, as shown in FIG. 2, the caulking concave portion 32 of this example is formed to be depressed in an arc shape along the circumferential direction of the axial end surface 311 of the support pin 3. As shown in FIG. 6, the caulking recess 32 can be formed in a circular depression, and as shown in FIG. 7, it can also be formed in a radial depression at a plurality of locations on the axial end surface 311.

  Although illustration is omitted, in this example, when the through hole 22 is formed in the support wall 21, a punch press having a die provided with a machining hole and a punch that slides into the machining hole of the die is used. Then, the support wall 21 in the rocker arm 1 before forming the through hole 22 is arranged on the surface of the die, and the punch hole is slid toward the processing hole of the die, thereby forming the through hole 22 in the support wall 21.

When the through hole 22 is formed, the punching side portion of the support wall 21 (the portion processed first by the punch) is sheared by the punch in the punch press to form the shear surface portion 221, The portion on the back side of the wall 21 is broken before being subjected to shearing with a punch, so that a fracture surface portion 222 is formed.
Thus, as shown in FIG. 1, the shearing surface portion 221 is formed in parallel with the sliding direction of the punch, and the fractured surface portion 222 is formed by expanding the diameter toward the inner side surface 216 of the support wall 21.

  As shown in the figure, the through hole 22 of this example has a shearing surface portion 221 in the outer portion of the through hole 22 by punching from the outer surface 215 of the support wall 21 by punching, and an inner portion of the through hole 22. Has a fracture surface 222. The support pin 3 deforms the distal end portion 313 of the insertion end 31 into the shear surface portion 221 and also deforms the portion 314 closer to the proximal end than the distal end portion 313 into the fractured surface portion 222, thereby supporting the wall 21. It is fixed by caulking.

  In the rocker arm 1 of this example, when the support pin 3 with the roller 4 attached is caulked and fixed to the pair of support walls 21, the pair of insertion end portions 31 of the support pin 3 are inserted into the respective through holes 22. It arrange | positions and the outer peripheral surface 312 of a pair of insertion edge part 31 is made to oppose the shearing surface part 221 and the torn surface part 222 in the through-hole 22, respectively. In this state, the caulking concave portions 32 are respectively formed in the axial end surfaces 311 of the insertion end portions 31 so that the outer peripheral surfaces 312 of the insertion end portions 31 are formed between the shear surface portions 221 and the fractured surface portions 222 of the respective through holes 22. Both are continuously deformed.

  At this time, the proximal end portion 314 of the support pin 3 is deformed along the fractured surface portion 222 whose diameter increases toward the inner surface 216 of the support wall 21. Therefore, even if a force pressing the support pin 3 outward in the axial direction is applied to the support wall 21, the base end side portion 314 of the support pin 3 is hooked on the fracture surface portion 222, and the support pin 3 is It is possible to prevent positional displacement in the axial direction. Thereby, the removal load when the support pin 3 comes out of the through hole 22 can be increased.

  Moreover, the surface of the torn surface 222 is in a state in which the material is stripped, and the surface is rough. Therefore, even if a force acts in the direction in which the support pin 3 is rotated with respect to the through hole 22 of the support wall 21, the proximal end portion 314 of the support pin 3 is hooked on the fracture surface portion 222, and the support pin 3 Can be prevented from causing a rotational displacement. Thereby, the rotational torque when the support pin 3 rotates with respect to the through hole 22 can be increased.

  Thus, the fracture surface portion 222 can improve the caulking characteristics such as the removal load and the rotational torque of the support pin 3. Moreover, the parallelism of the support pin 3 (parallelism with respect to the formation direction of the through hole 22) can be stabilized by the shearing surface portion 221.

Furthermore, the improvement of the caulking characteristic of the support pin 3 is achieved by a simple device using the shearing surface portion 221 and the fracture surface portion 222 formed in the through hole 22 by punching the through holes 22 in the pair of support walls 21 with a punch. It can be carried out.
Therefore, according to the rocker arm 1 of this example, it is possible to improve the caulking characteristics such as the unloading load and the rotational torque of the support pins 3 with respect to the pair of support walls 21 with a simple device.

  As shown in FIG. 8, the through hole 22A is punched from the inner surface 216 of the support wall 21 by punching, thereby having a shearing surface portion 221A on the inner portion of the through hole 22A and an outer portion of the through hole 22A. It is also possible to have a fracture surface 222A. The fractured surface portion 222A is formed to expand toward the outer side surface 215 of the support wall 21, and the support pin 3 deforms the distal end side portion 313A of the insertion end portion 31 into the fractured surface portion 222A and at the distal end side. The portion 314A on the proximal end side with respect to the portion 313A can be deformed into the shearing surface portion 221A and can be caulked and fixed to the support wall 21. Also in this case, the same effect as described above can be obtained.

  Further, as shown in FIG. 9, the power transmission component 1 can be a roller tappet 1B in an OHV type engine as shown in the figure, in addition to the rocker arm 1. Although not shown in detail, the roller tappet 1B is configured such that a roller 4B that rotates following the rotation of a cam 62 in a camshaft 61 is disposed between a pair of support walls 21B by a support pin 3. .

The roller tappet 1B is in contact with one end portion of the rocker arm 1 through a rod engaged therewith, and the one end portion of the rocker arm 1 is swung by receiving the rotation of the cam 62. The valve 63 engaged with the other end portion of the rocker arm 1 is configured to open and close.
Even when the power transmission component 1 is a roller tappet 1B, other configurations can be the same as those in the case of the rocker arm 1, and the same effects as in the case of the rocker arm 1 can be obtained.

Sectional explanatory drawing which expands and shows the state which crimped and fixed the insertion end part of the support pin to the support wall in an Example. The perspective view which shows the rocker arm as a power transmission component in an Example. The top view which shows the rocker arm as a power transmission component in an Example. Sectional explanatory drawing which shows the rocker arm as a power transmission component in an Example. In an Example, explanatory drawing which shows a valve opening / closing mechanism. In an Example, explanatory drawing which shows the crimping recessed part dented and formed in circular shape. In an Example, explanatory drawing which shows the crimping recessed part which carried out depression depression radially. Sectional explanatory drawing which expands and shows the state which crimped and fixed the insertion end part of the support pin to the support wall about the other rocker arm in an Example. Sectional explanatory drawing which shows the roller tappet as a power transmission component in an Example.

Explanation of symbols

1 Power transmission parts (Rocker arm)
DESCRIPTION OF SYMBOLS 2 Rocker arm main body 21 Support wall 215 Outer side surface 216 Inner side surface 22 Through-hole 221 Shear surface part 222 Broken surface part 3 Support pin 31 Insertion end part 311 Axial direction end face 312 Outer peripheral surface 32 Caulking recessed part 4 Roller 6 Valve opening / closing mechanism

Claims (4)

In a power transmission component that is used for a valve opening / closing mechanism in an engine and supports a roller by a support pin between a pair of support walls,
Each of the pair of support walls is formed with through holes penetrating the pair of support walls on the same line.
The through hole is punched with a punch to form a sheared surface portion on the punching side, and a fracture surface portion is formed on the opposite side to the punching side.
The support pin is formed by caulking recesses in the axial end surfaces thereof with the insertion end portions of the both ends inserted and disposed in the through holes, so that the outer peripheral surface of the insertion end portion is formed in the through hole. A power transmission component for use in a valve opening / closing mechanism, wherein the shear surface portion and the fractured surface portion are continuously deformed and caulked and fixed to the support wall. In Claim 1, the said through-hole has the said shearing surface part in the outer part of the said through-hole by punching out from the outer surface of the said support wall with the said punch, and has the said torn surface part in the inner part of the said through-hole. And
The fracture surface portion is formed to expand toward the inner surface of the support wall,
The support pin deforms the distal end portion of the insertion end portion into the shearing surface portion, deforms the proximal end portion relative to the distal end side portion into the fracture surface portion, and caulks and fixes it to the support wall. A power transmission component used in a valve opening / closing mechanism characterized by being. In Claim 1, the said through-hole has the said shearing surface part in the inner part of the said through-hole, and has the said torn surface part in the outer part of the said through-hole by punching out from the inner surface of the said support wall with the said punch. And
The fracture surface portion is formed with an increased diameter toward the outer surface of the support wall,
The support pin deforms the distal end portion of the insertion end portion into the fracture surface portion, and deforms the proximal end portion relative to the distal end portion into the shear surface portion, and caulks and fixes the support wall to the support wall. A power transmission component used in a valve opening / closing mechanism characterized by being.   4. The power transmission component used in a valve opening / closing mechanism according to claim 1, wherein the power transmission component is a rocker arm used for an OHC type engine or a roller tappet used for an OHV type engine.

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