JP4621099B2 - Power transmission component used for valve opening / closing mechanism and manufacturing method thereof - Google Patents

Description

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

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) engine, a rocker arm as a power transmission component supports a roller by a support pin between a pair of support walls, and the roller is driven to rotate as the cam rotates. While swinging, the valve is slid to open and close the intake and exhaust ports of the engine.

  Further, as shown in FIG. 19, in order to reduce the weight of the rocker arm 9, a hollow hole 930 is formed in the support pin 93, and the durability and strength of the portion 931 in which the roller 94 is disposed in the support pin 93 are improved. Therefore, this portion 931 is quenched. The support pin 93 is caulked and fixed to the support wall 921 of the rocker arm 9 by forming a caulking recess 935 into the axial end surface 932 of the support pin 93.

  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.

  However, in the conventional rocker arm 9 or cam follower, as shown in FIG. 19, the support pin 93 (support pin pin) is fixed when the support pin 93 (hollow support pin) having the hollow hole 930 is caulked and fixed. ), The outer peripheral side corner portion 934 is deformed and moved toward the support wall 921 (the bifurcated portion at the tip of the arm), and the inner peripheral side corner portion 933 is also deformed and moved toward the support wall 921. . Therefore, it is not sufficient for improving the caulking strength of the support pin 93.

Japanese Utility Model Publication No. 6-25503

  The present invention has been made in view of such conventional problems, and a power transmission component used for a valve opening / closing mechanism capable of improving the caulking strength of the support pin while maintaining the weight reduction of the support pin, and a manufacturing method thereof. Is to provide.

A first invention is a power transmission component that is used in a valve opening / closing mechanism in an engine and supports a roller with a support pin between a pair of support walls.
Each of the pair of support walls is formed with a through hole formed by penetrating the pair of support walls on the same line.
The support pin has a hollow hole that is formed so as to penetrate along the axial direction or recessed from both end surfaces in the axial direction. The part has a cured roller support curing part, and the roller support curing part is rotatably disposed in the roller support curing part,
The insertion arrangement end has an uncured portion that has not been cured in the remaining portion, and has a cured portion for backup that has been surface-cured on the inner peripheral side portion thereof,
By forming a caulking recess in the uncured portion on the axial end face of the insertion arrangement end, the outer peripheral side corner of the insertion arrangement end is deformed and moved toward the opening edge of the through hole. The power transmission component used in the valve opening / closing mechanism is characterized in that the insertion arrangement end is caulked and fixed to the support wall (claim 1).

The power transmission component of the present invention is formed by forming the hollow hole in the support pin. Thereby, weight reduction of a support pin can be achieved.
Moreover, the power transmission component has a roller support / curing portion subjected to a curing process at a central portion between both ends of the support pin. And the durability and strength of the portion of the support pin where the roller is provided are improved by disposing the roller in the roller support and hardening portion.

Furthermore, the insertion arrangement end portion of the support pin has a backup curing portion subjected to surface curing treatment on the inner peripheral side portion thereof, and has an uncured portion not subjected to curing treatment on the remaining portion thereof.
When the support pin in a state where the roller is disposed is caulked and fixed to the support wall, a caulking concave portion is formed in the uncured portion on the end surface in the axial direction of the support pin. At this time, the outer peripheral side corner of the insertion arrangement end can be easily deformed and moved toward the opening edge of the through hole in the support wall by being an uncured portion.

On the other hand, when the caulking recess is formed in the depression, the back-up curing portion is formed on the inner peripheral side portion of the insertion arrangement end, so that the material around the portion where the caulking depression is formed is inserted and inserted. It can prevent moving toward the inner peripheral side.
As a result, most of the material around the portion where the caulking concave portion is depressed can be moved toward the outer peripheral side of the insertion arrangement end, and the outer peripheral corner of the insertion arrangement end can be moved to the through hole in the support wall. Can be deformed and moved more easily toward the opening edge. Therefore, the support pin can be firmly caulked and fixed to the support wall in the power transmission component.

  Therefore, according to the power transmission component of the present invention, it is possible to improve the caulking strength of the support pin while maintaining the weight reduction of the support pin.

A second invention is a power transmission component that is used for a valve opening / closing mechanism in an engine and supports a roller with a support pin between a pair of support walls.
Each of the pair of support walls is formed with a through hole formed by penetrating the pair of support walls on the same line.
The support pin has a hollow hole that is formed so as to penetrate along the axial direction or recessed from both end surfaces in the axial direction. The part has a cured roller support curing part, and the roller support curing part is rotatably disposed in the roller support curing part,
The insertion arrangement end is formed by inserting a backup member into the hollow hole.
By forming a caulking recess into the axial end face of the insertion arrangement end, the outer peripheral side corner of the insertion arrangement end is deformed and moved toward the opening edge of the through hole, and the insertion arrangement end The power transmission component used in the valve opening / closing mechanism is characterized in that the portion is caulked and fixed to the support wall (claim 2).

In the power transmission component of the present invention, the insertion end portion of the support pin is formed by inserting a backup member into the hollow hole instead of having the backup curing portion.
Therefore, when the caulking recess is formed in a recessed manner, the back-up member is inserted into the hollow hole in the insertion placement end, so that the material around the portion where the caulking recess is recessed is formed on the inner peripheral side of the insertion placement end. Can be prevented from moving toward.

As a result, most of the material around the portion where the caulking concave portion is depressed can be moved toward the outer peripheral side of the insertion arrangement end, and the outer peripheral corner of the insertion arrangement end can be moved to the through hole in the support wall. Can be deformed and moved more easily toward the opening edge. Therefore, the support pin can be firmly caulked and fixed to the support wall in the power transmission component.
In addition, the function and effect of the present invention are the same as the function and effect of the first invention.

  Therefore, even with the power transmission component of the present invention, it is possible to improve the caulking strength of the support pin while maintaining the weight reduction of the support pin.

The third invention is used for a valve opening / closing mechanism in an engine, and a roller is supported by a support pin between a pair of support walls, and the pair of support walls penetrates the pair of support walls on the same line. The support pins each have a hollow hole formed through the axial direction or recessed from each end surface in the axial direction. A power transmission component is manufactured having a cured roller support and curing portion at a central portion between both ends of the insertion and placement portions, and the roller support and curing portion being rotatably disposed in the roller support and curing portion. In the method
A curing treatment step for forming a backup curing portion by performing a surface curing treatment on the inner peripheral side portion at the insertion arrangement end, and
An assembly step in which the support pins are inserted into the through holes and the insertion holes of the rollers, and the support pins are spanned over the pair of support walls;
A caulking recess is formed in the uncured portion on the axial end face of the insertion arrangement end by caulking tool so that the outer peripheral side corner of the insertion arrangement end is directed toward the opening edge of the through hole. And a caulking step of caulking and fixing the insertion arrangement end to the support wall by being deformed and moved.

  In the power transmission component manufacturing method of the present invention, in the curing process, the backup curing portion is formed on the inner peripheral side portion of the support pin insertion arrangement end, and the roller is disposed in the assembly process. The support pins in the state of being put are hung on a pair of support walls. Next, in the caulking step, the insertion placement end of the support pin is caulked and fixed to the support wall using a caulking tool.

When the caulking concave portion is formed in the axial end surface of the insertion arrangement end, the periphery of the portion where the caulking concave portion is formed by forming the backup hardening portion on the inner peripheral side portion of the insertion arrangement end. This material can be prevented from moving toward the inner peripheral side of the insertion arrangement end.
As a result, most of the material around the portion where the caulking concave portion is depressed can be moved toward the outer peripheral side of the insertion arrangement end, and the outer peripheral corner of the insertion arrangement end can be moved to the through hole in the support wall. Can be deformed and moved more easily toward the opening edge. Therefore, the support pin can be firmly caulked and fixed to the support wall in the power transmission component.

  Therefore, according to the method for manufacturing a power transmission component of the present invention, it is possible to easily manufacture a power transmission component in which the caulking strength of the support pin is improved while maintaining the weight reduction of the support pin.

The fourth invention is used for a valve opening / closing mechanism in an engine, and a roller is supported by a support pin between a pair of support walls, and the pair of support walls penetrates the pair of support walls on the same line. The support pins each have a hollow hole formed through the axial direction or recessed from each end surface in the axial direction. A power transmission component is manufactured having a cured roller support and curing portion at a central portion between both ends of the insertion and placement portions, and the roller support and curing portion being rotatably disposed in the roller support and curing portion. In the method
Insertion step of inserting a backup member into the hollow hole of the insertion arrangement end,
An assembly step of passing the support pins through the pair of support walls by inserting the support pins into the through holes and the insertion holes of the rollers;
By deforming the outer peripheral side corner of the insertion arrangement end toward the opening edge of the through-hole by forming a caulking recess in the axial end face of the insertion arrangement end by caulking tool, And a caulking step of caulking and fixing the insertion arrangement end portion to the support wall. A method for producing a power transmission component for use in a valve opening / closing mechanism (Claim 6).

In the power transmission component manufacturing method of the present invention, in the insertion step, a backup member is inserted into the hollow hole at the insertion placement end of the support pin, and in the assembly step, the support pin in a state where the roller is disposed is provided. Hang over a pair of support walls. Next, in the caulking step, the insertion placement end of the support pin is caulked and fixed to the support wall using a caulking tool.
And, when forming the caulking recess in the axial end face of the insertion arrangement end, the material around the portion where the caulking depression is recessed is inserted by inserting the backup member into the hollow hole of the insertion arrangement end. It can prevent moving toward the inner peripheral side of the insertion arrangement end.

  As a result, most of the material around the portion where the caulking concave portion is depressed can be moved toward the outer peripheral side of the insertion arrangement end, and the outer peripheral corner of the insertion arrangement end can be moved to the through hole in the support wall. Can be deformed and moved more easily toward the opening edge. Therefore, the support pin can be firmly caulked and fixed to the support wall in the power transmission component.

  Therefore, according to the power transmission component manufacturing method of the present invention, it is possible to easily manufacture a power transmission component in which the caulking strength of the support pin is improved while maintaining the weight reduction of the support pin.

A fifth invention is used for a valve opening / closing mechanism in an engine, and a roller is supported by a support pin between a pair of support walls, and the pair of support walls penetrates the pair of support walls on the same line. The support pins each have a hollow hole formed through the axial direction or recessed from each end surface in the axial direction. A power transmission component is manufactured having a cured roller support and curing portion at a central portion between both ends of the insertion and placement portions, and the roller support and curing portion being rotatably disposed in the roller support and curing portion. In the method
Using a caulking tool for caulking and fixing the axial end face of the support pin to the support wall, the caulking tool is disposed on the outer peripheral side of the central core part, and a central core part inserted into the hollow hole, An outer periphery caulking portion that forms a depressed caulking recess in the axial end face,
An assembly step of passing the support pins through the pair of support walls by inserting the support pins into the through holes and the insertion holes of the rollers;
With the central core portion inserted into the hollow hole at the insertion arrangement end, the axial end surface of the insertion arrangement end is pressed by the outer periphery caulking portion, and the caulking recess is depressed at the axial end surface. A caulking step of deforming and moving the outer peripheral side corner portion of the insertion arrangement end portion toward the opening edge of the through hole by caulking and fixing the insertion arrangement end portion to the support wall. The present invention resides in a method for manufacturing a power transmission component used in a valve opening / closing mechanism characterized by the above.

In the power transmission component manufacturing method of the present invention, in the assembly step, the support pins in a state where the rollers are arranged are hung on a pair of support walls. In the caulking step, the insertion placement end of the support pin is caulked and fixed to the support wall using a caulking tool.
At this time, in the caulking step, a caulking tool including the central core portion and the outer circumferential caulking portion is used.

Then, when the caulking recess is formed in the axial end face of the insertion arrangement end, the axial end face of the insertion arrangement end is added by the outer periphery caulking part with the central core portion inserted into the hollow hole of the insertion arrangement end. Press. At this time, since the central core portion is inserted into the hollow hole of the insertion arrangement end, the material around the portion where the caulking depression is formed is moved toward the inner peripheral side of the insertion arrangement end. Can be blocked.
As a result, most of the material around the portion where the caulking concave portion is depressed can be moved toward the outer peripheral side of the insertion arrangement end, and the outer peripheral corner of the insertion arrangement end can be moved to the through hole in the support wall. Can be deformed and moved more easily toward the opening edge. Therefore, the support pin can be firmly caulked and fixed to the support wall in the power transmission component.

  Therefore, according to the power transmission component manufacturing method of the present invention, it is possible to easily manufacture a power transmission component in which the caulking strength of the support pin is improved while maintaining the weight reduction of the support pin.

A sixth invention is used for a valve opening / closing mechanism in an engine, and a roller is supported by a support pin between a pair of support walls, and the pair of support walls penetrates the pair of support walls on the same line. The support pins each have a hollow hole formed through the axial direction or recessed from each end surface in the axial direction. A power transmission component is manufactured having a cured roller support and curing portion at a central portion between both ends of the insertion and placement portions, and the roller support and curing portion being rotatably disposed in the roller support and curing portion. In the method
A caulking tool for caulking and fixing the axial end surface of the support pin to the support wall is used, and the caulking tool is used to form a depressed caulking recess in the axial end surface at the pressing tip surface. An outer circumferential side caulking projection, and an inner circumferential side backup projection that is formed on the inner circumferential side of the outer circumferential side caulking projection and projects higher than the outer circumferential side caulking projection,
An assembly step of passing the support pins through the pair of support walls by inserting the support pins into the through holes and the insertion holes of the rollers;
In a state where the inner circumferential backup projection is embedded in the axial end surface of the insertion arrangement end, the axial end surface is pressurized by the outer circumferential caulking projection, and the caulking concave portion is formed in the axial end surface. A caulking step of deforming and moving the outer peripheral side corner of the insertion arrangement end toward the opening edge of the through hole, and caulking and fixing the insertion arrangement end to the support wall. In the manufacturing method of the power transmission component used for the valve opening and closing mechanism.

In the power transmission component manufacturing method of the present invention, in the assembly step, the support pins in a state where the rollers are arranged are hung on a pair of support walls. In the caulking step, the insertion placement end of the support pin is caulked and fixed to the support wall using a caulking tool.
At this time, in the caulking step, a caulking tool provided with the outer peripheral side caulking protrusion and the inner peripheral side backup protrusion is used.

Then, when the caulking recess is formed in the axial end face of the insertion arrangement end, the axial end face is pressurized by the outer side caulking protrusion in a state where the inner peripheral backup protrusion is embedded in the axial end face of the insertion arrangement end. . At this time, the inner peripheral backup protrusion is embedded in the axial end surface, thereby preventing the material around the portion where the caulking concave portion is depressed from moving toward the inner peripheral side of the insertion arrangement end portion. be able to.
As a result, most of the material around the portion where the caulking concave portion is depressed can be moved toward the outer peripheral side of the insertion arrangement end, and the outer peripheral corner of the insertion arrangement end can be moved to the through hole in the support wall. Can be deformed and moved more easily toward the opening edge. Therefore, the support pin can be firmly caulked and fixed to the support wall in the power transmission component.

  Therefore, according to the power transmission component manufacturing method of the present invention, it is possible to easily manufacture a power transmission component in which the caulking strength of the support pin is improved while maintaining the weight reduction of the support pin.

A preferred embodiment in the first to sixth inventions described above will be described.
In the second and fourth inventions, the backup member is preferably caulked and fixed to the insertion arrangement end of the support pin by forming a caulking recess in the axially outer end surface thereof. Item 3).
In this case, the back-up member can be prevented from coming off, and the insertion end of the support pin can be caulked and fixed to the support wall more firmly.

In the first to sixth inventions, the power transmission component is preferably a rocker arm used for an OHC (overhead cam) type engine or a roller tappet used for an OHV (overhead valve) type engine. .
In this case, in the rocker arm or the roller tappet, it is possible to improve the caulking strength of the support pin while maintaining the weight reduction of the support pin.

In the first to sixth aspects of the invention, the hardening treatment in the roller support hardening portion of the support pin can be, for example, a heat treatment such as quenching treatment, quenching / tempering treatment performed on the central portion of the support pin. .
Moreover, in the said 1st, 3rd invention, the surface hardening process in the backup hardening part of the insertion arrangement | positioning edge part of the said support pin can be made into the heat processing similar to the above.

In particular, the curing process in the roller support curing part of the support pin and the surface curing process in the backup curing part at the end portion where the support pin is inserted are induction hardening process or induction hardening tempering using induction heating action by high frequency current. It is preferable to set it as a treatment.
The curing treatment or surface curing treatment may be carburization treatment, nitriding treatment, or vapor deposition treatment such as PVD (physical vapor deposition method) or CVD (chemical vapor deposition method).

In the second and fourth inventions, the backup member is preferably harder than the support pin in an uncured state. In this case, when the caulking concave portion is recessed on the axial end surface of the insertion end portion of the support pin, most of the material around the portion where the caulking concave portion is recessed is more easily perimeter of the insertion arranging end portion. Can be moved to the side.
Moreover, the backup member can be made into the cylindrical shape inserted in the insertion arrangement | positioning edge part of a support pin. In addition to this, the backup member may be a steel ball that fits into the insertion placement end of the support pin.

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

  As shown in FIGS. 3 and 4, the pair of support walls 21 are formed with through holes 22 formed by penetrating the pair of support walls 21 on the same line. The support pin 3 has a hollow hole 30 formed so as to penetrate along the axial direction thereof. The support pin 3 has a roller support / curing portion 311 that has been cured at a central portion 31 between the insertion-arranged end portions 32 that are respectively inserted and disposed in the through holes 22 of the support wall 21. And the support pin 3 arrange | positions the said roller 4 rotatably in this roller support hardening part 311. As shown in FIG.

Moreover, as shown in FIG. 4, the insertion arrangement | positioning edge part 32 of the support pin 3 has the hardening part for backup 331 which carried out the surface hardening process in the inner peripheral side part 33, and the uncured which has not been hardened in the remainder. Part 341. Insertion arrangement end portions 32 of the support pins 3 are inserted into the respective through holes 22 of the support wall 21.
And the power transmission component 1 of this example supports the outer peripheral side corner portion 322 of the insertion arrangement end portion 32 by forming the caulking recess portion 35 into the uncured portion 341 in the axial end surface 321 of the support pin 3. The insertion end portion 32 is caulked and fixed to the support wall 21 by being deformed and moved toward the opening edge 221 of the through hole 22 of the wall 21.

Hereinafter, the power transmission component 1 used in the valve opening / closing mechanism 6 of this example and the manufacturing method thereof will be described in detail with reference to FIGS.
As shown in FIG. 1, the valve opening / closing mechanism 6 of this example includes a rotation of a valve 63 disposed in an intake / exhaust port (intake port or exhaust port) 60 of an engine and a cam 62 provided in an engine cam shaft 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 FIG. 2, 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. 1, 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 FIG. 1, 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.

  As shown in FIGS. 3 and 4, the power transmission component 1 of the present example is formed by forming a hollow hole 30 in the support pin 3 in order to reduce the weight of the support pin 3. Further, the power transmission component 1 has a roller support / curing portion 311 that has been cured at a central portion 31 between both end portions 32 of the support pin 3 inserted and disposed. The roller support / curing portion 311 is provided with the roller 4. By arranging, the strength of the portion of the support pin 3 where the roller 4 is arranged is improved.

As shown in FIG. 4, the backup curing portion 331 in the inner peripheral side portion 33 of the insertion arrangement end portion 32 of the support pin 3 of this example is formed up to the axial end surface 321 in the inner peripheral side portion 33.
In addition, the backup curing portion 331 of this example is formed on the entire circumference of the inner peripheral side portion 33 of the insertion arrangement end portion 32. On the other hand, the backup curing portion 331 can be partially formed at a plurality of locations in the circumferential direction of the inner circumferential side portion 33 of the insertion arrangement end portion 32.

Further, the opening edge portion 221 of the through hole 22 of the support wall 21 is chamfered so that the outer peripheral side corner portion 322 of the support pin 3 can be easily deformed and moved when the caulking is fixed.
Further, the caulking concave portion 35 of this example is formed in an annular shape in the uncured portion 341 on the axial end surface 321 of the support pin 3. On the other hand, the caulking concave portion 35 is not necessarily formed in an annular shape, and can be formed, for example, at a plurality of locations of the uncured portion 341 in the axial end surface 321 of the support pin 3.

Next, the manufacturing method of the power transmission component 1 of this example will be described.
The manufacturing method of the power transmission component 1 of this example manufactures the rocker arm 1 as the power transmission component 1 by performing the following rocker arm body manufacturing process, support pin manufacturing process, curing process, assembly process, and caulking process. .
In the rocker arm main body manufacturing step, the rocker arm main body 2 formed by bending the sheet metal and connecting the pair of support walls 21 by the first connecting portion 23 and the second connecting portion 24 is formed (see FIG. 2). ). Further, the through holes 22 are formed in the pair of support walls 21 of the rocker arm body 2.

Further, in the support pin manufacturing process, the support pin 3 having the hollow hole 30 is manufactured, and the center portion 31 of the support pin 3 is subjected to induction hardening as a curing process to form the roller support / curing portion 311 (FIG. 4).
In the curing process, the backup curing unit 331 is formed by performing an induction hardening process as a surface curing process on the inner peripheral side portion 33 of the insertion arrangement end 32 of the support pin 3. This induction hardening process is not performed on a portion other than the inner peripheral side portion 33 in the insertion arrangement end portion 32, that is, on the outer peripheral side portion 34 in the insertion arrangement end portion 32, and the outer peripheral side portion 34 is not cured. An uncured portion 341 is formed.

Further, in the assembling step, as shown in FIG. 5, the support pins 3 are inserted into the through holes 22 of the pair of support walls 21 and the insertion holes 411 of the rollers 4, and the support pins 3 are supported by a pair of supports. It is hung on the wall 21. Then, the roller 4 is disposed by the support pin 3 between the pair of support walls 21.
In this example, the assembling process was performed after the curing process. On the other hand, after performing an assembly | attachment process, a hardening process process can also be performed.

  Further, in the caulking step, as shown in FIG. 6, the insertion arrangement end portion 32 of the support pin 3 is formed using the caulking tool 7 formed with the caulking projection 71 projecting in an annular shape from the pressure front end surface 70. It is caulked and fixed to the support wall 21. Note that the caulking and fixing with the caulking tool 7 is performed on both insertion arrangement end portions 32 of the support pin 3.

  Then, in the caulking step, as shown in the figure, a caulking recess 35 is depressed by the caulking tool 7 in the uncured portion 341 of the axial end surface 321 in the outer peripheral side portion 34 of the insertion end portion 32 of the support pin 3. . Due to the depression formation of the caulking concave portion 35, the outer peripheral side corner portion 322 of the insertion arrangement end portion 32 that is the uncured portion 341 is easily deformed and moved toward the opening edge portion 221 of the through hole 22 of the support wall 21.

On the other hand, when the caulking concave portion 35 is depressed, the back-up curing portion 331 is formed on the inner peripheral portion 33 of the insertion arrangement end portion 32, so that the material around the portion where the caulking concave portion 35 is depressed is formed. Therefore, it is possible to prevent movement toward the inner peripheral side of the insertion arrangement end portion 32.
Accordingly, most of the material around the portion where the caulking concave portion 35 is depressed can be moved toward the outer peripheral side of the insertion arrangement end portion 32, and the outer peripheral side corner portion 322 of the insertion arrangement end portion 32 is supported. The wall 21 can be more easily deformed and moved toward the opening edge 221 of the through hole 22. Therefore, the support pin 3 can be firmly caulked and fixed to the support wall 21 in the power transmission component 1.

  Therefore, according to the power transmission component 1 and the manufacturing method thereof of the present example, it is possible to improve the caulking strength of the support pin 3 while maintaining the weight reduction of the support pin 3.

  Note that the hollow holes 30 in the support pin 3 do not necessarily have to be formed through the axial direction as described above, and may be formed to be recessed from both axial end surfaces 321 of the support pin 3 as shown in FIG. it can. In this case, although the central portion 31 of the support pin 3 is solid, the weight of the support pin 3 can be reduced by the hollow holes 30 that are recessed from the axial end surfaces 321.

(Example 2)
As shown in FIG. 8, the insertion arrangement end portion 32 of the support pin 3 in the power transmission component 1 of this example is formed by inserting the backup member 5 into the hollow hole 30 instead of having the backup curing portion 331. . The backup member 5 has a cylindrical shape that fits into the hollow hole 30 of the insertion arrangement end 32. Moreover, the hardness of the backup member 5 is higher than the hardness of the uncured support pin 3.

Further, as shown in the figure, the backup member 5 of this example is caulked and fixed to the insertion arrangement end portion 32 of the support pin 3 by forming a caulking recess 55 in the axially outer end surface 51. In addition, when the backup member 5 is firmly inserted into the hollow hole 30 in the insertion arrangement end portion 32, the caulking concave portion 55 may not be formed.
In addition, the configuration of the power transmission component 1 of this example is the same as that of the first embodiment.

In the manufacturing method of this example, instead of performing the above-described curing process, an insertion process of inserting the backup member 5 into the hollow hole 30 of the insertion arrangement end 32 is performed. Other steps are the same as those in the first embodiment.
Further, in the caulking step of this example, as shown in FIG. 9, when the caulking recess 35 is formed in the axial end surface 321 of the insertion arrangement end 32, the backup member is inserted into the hollow hole 30 of the insertion arrangement end 32. By inserting 5, it is possible to prevent the material around the portion where the caulking concave portion 35 is depressed from moving toward the inner peripheral side of the insertion arrangement end portion 32.

  Accordingly, most of the material around the portion where the caulking concave portion 35 is depressed can be moved toward the outer peripheral side of the insertion arrangement end portion 32, and the outer peripheral side corner portion 322 of the insertion arrangement end portion 32 is supported. The wall 21 can be more easily deformed and moved toward the opening edge 221 of the through hole 22. Therefore, the support pin 3 can be firmly caulked and fixed to the support wall 21 in the power transmission component 1.

Further, in this example, as shown in FIG. 8, the insertion disposing end portion 32 of the support pin 3 is more firmly supported by forming the caulking concave portion 55 in the axially outer end surface 51 of the backup member 5. It can be caulked and fixed to 21.
In addition, the operational effects in this example are the same as the operational effects in the first embodiment.

(Example 3)
In the manufacturing method of this example, as shown in FIGS. 10 to 12, instead of performing the curing process step in Example 1 or the fitting step in Example 2, in the caulking step, the following central core portion 72 and The above caulking and fixing are performed using a caulking tool 7 having an outer circumferential caulking portion 73.

As shown in FIG. 10, the caulking tool 7 of this example is formed by dividing a central core portion 72 and an outer circumferential caulking portion 73, which can be moved separately. The central core portion 72 is configured to be inserted into the hollow hole 30 at the insertion arrangement end portion 32 of the support pin 3. The outer caulking portion 73 is arranged on the outer peripheral side of the central core portion 72 and is configured to form a depressed caulking concave portion 35 on the axial end surface 321 of the insertion arrangement end portion 32. A caulking projection 731 that protrudes in an annular shape is formed on the pressure front end surface 730 of the outer caulking portion 73.
In addition, the configuration of the power transmission component 1 of this example is the same as that of the first embodiment.

  In the manufacturing method of the power transmission component 1 of this example, after performing the assembly process, in the caulking process, as shown in FIG. 11, the center core 72 of the caulking tool 7 is inserted into the hollow hole of the insertion arrangement end 32. 30 is inserted. At this time, the material at the insertion arrangement end portion 32 can be slightly deformed and moved toward the outer peripheral side by the central core portion 72.

  Then, as shown in FIG. 12, in the state where the central core portion 72 is inserted into the hollow hole 30, the axial end surface 321 of the insertion arrangement end portion 32 is pressurized by the outer periphery caulking portion 73 of the caulking tool 7, and this axial direction A caulking recess 35 is formed in the end surface 321 in a recessed manner. At this time, since the central core portion 72 is inserted into the hollow hole 30 of the insertion arrangement end portion 32, the material around the portion where the caulking concave portion 35 is recessed is formed on the inner peripheral side of the insertion arrangement end portion 32. It can prevent moving toward.

  Accordingly, most of the material around the portion where the caulking concave portion 35 is depressed can be moved toward the outer peripheral side of the insertion arrangement end portion 32, and the outer peripheral side corner portion 322 of the insertion arrangement end portion 32 is supported. The wall 21 can be more easily deformed and moved toward the opening edge 221 of the through hole 22. Therefore, the support pin 3 can be firmly caulked and fixed to the support wall 21 in the power transmission component 1.

  Further, in this example, as shown in FIG. 13, the central core portion 72 and the outer periphery caulking portion 73 can be formed in one caulking tool 7 without being formed separately. In this case, in the caulking tool 7, the pressurizing tip portion 721 in the central core portion 72 is formed so as to protrude from the pressurizing tip portion in the outer periphery caulking portion 73.

Although not shown, the central core portion 72 and the outer periphery caulking portion 73 are separately formed, and the outer periphery caulking portion 73 forms the caulking recess portion 35 on the axial end surface 321 of the insertion arrangement end portion 32 of the support pin 3. After the formation, the central core portion 72 can be inserted into the hollow hole 30 in the insertion arrangement end portion 32. In this case, the portion projecting and deforming into the hollow hole 30 when the caulking concave portion 35 is formed is corrected by the central core portion 72 and the material at the insertion arrangement end portion 32 is deformed and moved toward the outer peripheral side. Can do.
In addition, the operational effects in this example are the same as the operational effects in the first embodiment.

Example 4
In the manufacturing method of this example, as shown in FIGS. 14 to 16, instead of performing the curing process step in Example 1 or the fitting step in Example 2 above, in the above caulking step, the following outer peripheral side caulking projection 74 is performed. Further, the above caulking and fixing are performed using the caulking tool 7 provided with the inner peripheral side backup projection 75.
As shown in FIG. 14, the caulking tool 7 of this example is formed by integrally forming an outer circumferential side caulking projection 74 and an inner circumferential side backup projection 75 on the pressure front end surface 70.

As shown in FIGS. 14 and 15, the outer caulking protrusion 74 protrudes from the pressurizing tip surface 70 of the caulking tool 7 in order to form a depressed caulking recess 35 on the axial end surface 321 of the insertion arrangement end 32. It is formed. The inner peripheral side backup protrusion 75 is formed so as to protrude from the pressurizing tip surface 70 of the caulking tool 7 on the inner peripheral side of the outer peripheral side caulking protrusion 74. The inner periphery side backup protrusion 75 is formed so as to protrude higher than the outer periphery side caulking protrusion 74.
Further, the outer peripheral side caulking protrusion 74 and the inner peripheral side backup protrusion 75 of this example are both formed in an annular shape with the central axis of the caulking tool 7 as the center.
In addition, the configuration of the power transmission component 1 of this example is the same as that of the first embodiment.

In the manufacturing method of the power transmission component 1 of this example, after performing the assembly process, the caulking tool 7 is moved toward the axial end surface 321 in the insertion arrangement end portion 32 of the support pin 3 in the caulking process. . At this time, first, as shown in FIG. 15, the inner circumferential backup protrusion 75 pressurizes the axial end face 321 of the insertion arrangement end 32 and is embedded in the axial end face 321. In this state, as shown in FIG. 16, the caulking protrusion 74 on the outer peripheral side pressurizes the axial end surface 321 to form the caulking concave portion 35.
When the caulking concave portion 35 is formed, the inner peripheral backup projection 75 is embedded in the axial end surface 321, so that the material around the portion where the caulking concave portion 35 is depressed is inserted into the inner circumference of the insertion arrangement end portion 32. The movement toward the side can be prevented.

  Accordingly, most of the material around the portion where the caulking concave portion 35 is depressed can be moved toward the outer peripheral side of the insertion arrangement end portion 32, and the outer peripheral side corner portion 322 of the insertion arrangement end portion 32 is supported. The wall 21 can be more easily deformed and moved toward the opening edge 221 of the through hole 22. Therefore, the support pin 3 can be firmly caulked and fixed to the support wall 21 in the power transmission component 1.

As shown in FIG. 17, the caulking tool 7 is divided into a central portion 750 and an outer peripheral portion 740 disposed on the outer periphery of the central portion 750, and the inner peripheral backup protrusion 75 is formed on the central portion 750. In addition, the outer peripheral side caulking projection 74 can be formed on the outer peripheral side portion 740. In this case, the center side portion 750 is moved first, and the inner peripheral side backup protrusion 75 is embedded in the axial end surface 321 at the insertion arrangement end portion 32, and then the outer peripheral side portion 740 is moved to By the caulking protrusion 74, the caulking concave portion 35 can be formed to be depressed in the axial end surface 321 of the insertion arrangement end portion 32.
In addition, the operational effects in this example are the same as the operational effects in the first embodiment.

  In addition to the rocker arm 1, the power transmission component 1 in the first to fourth embodiments can be a roller tappet 1A in an OHV type engine, for example, as shown in FIG. Although detailed illustration is omitted, the roller tappet 1A is configured such that a roller 4A that rotates following the rotation of a cam in a camshaft is disposed between a pair of support walls 21A by a support pin 3A.

The roller tappet 1A is in contact with one end of the rocker arm via a rod engaged therewith, and the other end of the rocker arm is swung by receiving the rotation of the cam and swinging the one end of the rocker arm. A valve that engages the side end is configured to open and close.
Even when the power transmission component 1 is a roller tappet 1A, other configurations can be the same as those of the rocker arm 1, and the same operational effects as those of the rocker arm 1 can be obtained.

In Example 1, it is explanatory drawing which shows a valve opening / closing mechanism. In Example 1, it is a perspective view which shows the rocker arm as a power transmission component. FIG. 3 is a cross-sectional view showing a rocker arm in the first embodiment. In Example 1, it is sectional drawing which expands and shows the periphery of the insertion arrangement | positioning edge part of the support pin in a rocker arm. In Example 1, it is sectional drawing which shows the state which made the caulking tool face the rocker arm of the state which spanned the support pin which arrange | positioned the roller on a pair of support wall. Sectional drawing which shows the state which performed the caulking fixation of the support pin with respect to a support wall with the caulking tool in Example 1. FIG. Sectional drawing which shows the other rocker arm in Example 1. FIG. In Example 2, sectional drawing which expands and shows the periphery of the insertion arrangement | positioning edge part of the support pin in a rocker arm. Sectional drawing which shows the state which carried out the caulking fixation of the support pin with respect to a support wall with the caulking tool in Example 2. FIG. In Example 3, sectional drawing which shows the state which made the caulking tool face the rocker arm of the state which spanned the support pin which arrange | positioned the roller on a pair of support wall. Sectional drawing which shows the state which inserted the center core part of the crimping tool in the hollow hole in the insertion arrangement | positioning edge part of a support pin in Example 3. FIG. In Example 3, it is sectional drawing which shows the state which carried out the caulking fixation of the support pin with respect to a support wall by the outer periphery caulking part of the caulking tool. Sectional drawing which shows the state which fixed the crimping of the support pin with respect to a support wall with the other crimping tool in Example 3. FIG. Sectional drawing which shows the state which made the caulking tool face the rocker arm of the state which spanned the support pin which arrange | positioned the roller in Example 4 on a pair of support wall. In Example 4, sectional drawing which shows the state which embedded the inner peripheral side backup protrusion of the crimping tool in the axial direction end surface in the insertion arrangement | positioning edge part of a support pin. Sectional drawing which shows the state which carried out the caulking fixation of the support pin with respect to a support wall with the caulking protrusion of the outer peripheral side of the caulking tool in Example 4. FIG. In Example 4, it is sectional drawing which shows the state which embedded the inner peripheral side backup protrusion of the other crimping tool in the axial direction end surface in the insertion arrangement | positioning edge part of a support pin. Sectional drawing which shows the roller tappet as a power transmission component in Examples 1-4. Sectional drawing which expands and shows the periphery of the insertion arrangement | positioning edge part of the support pin in a rocker arm in a prior art example.

Explanation of symbols

1 Power transmission parts (Rocker arm)
2 Rocker arm body 21 Support wall 22 Through hole 221 Open edge 3 Support pin 30 Hollow hole 31 Central portion 311 Roller support hardening portion 32 Insertion arrangement end portion 321 Axial end surface 322 Outer peripheral side corner 33 Inner peripheral side portion 331 Backup hardening Part 34 outer peripheral side part 341 uncured part 35 caulking concave part 4 roller 5 backup member 51 axial direction outer end face 55 caulking concave part 6 valve opening / closing mechanism 7 caulking tool 71 caulking projection part 72 central core part 73 outer caulking part 731 caulking projection part 74 outer circumference Side caulking protrusion 75 Inner circumference side backup protrusion

Claims (8)

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 a through hole formed by penetrating the pair of support walls on the same line.
The support pin has a hollow hole that is formed so as to penetrate along the axial direction or recessed from both end surfaces in the axial direction. The part has a cured roller support curing part, and the roller support curing part is rotatably disposed in the roller support curing part,
The insertion arrangement end has an uncured portion that has not been cured in the remaining portion, and has a cured portion for backup that has been surface-cured on the inner peripheral side portion thereof,
By forming a caulking recess in the uncured portion on the axial end face of the insertion arrangement end, the outer peripheral side corner of the insertion arrangement end is deformed and moved toward the opening edge of the through hole. A power transmission component used for a valve opening / closing mechanism, wherein the insertion arrangement end is caulked and fixed to the support wall. 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 a through hole formed by penetrating the pair of support walls on the same line.
The support pin has a hollow hole that is formed so as to penetrate along the axial direction or recessed from both end surfaces in the axial direction. The part has a cured roller support curing part, and the roller support curing part is rotatably disposed in the roller support curing part,
The insertion arrangement end is formed by inserting a backup member into the hollow hole.
By forming a caulking recess into the axial end face of the insertion arrangement end, the outer peripheral side corner of the insertion arrangement end is deformed and moved toward the opening edge of the through hole, and the insertion arrangement end A power transmission component for use in a valve opening / closing mechanism characterized in that a portion is caulked and fixed to the support wall.   3. The valve opening and closing mechanism according to claim 2, wherein the back-up member is caulked and fixed to the insertion arrangement end of the support pin by forming a caulking recess in the axially outer end surface thereof. Power transmission parts.   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. Used in a valve opening / closing mechanism in an engine, a roller is supported by a support pin between a pair of support walls, and the pair of support walls has a through hole formed through the pair of support walls on the same line. Each of the support pins has hollow holes formed so as to penetrate along the axial direction or recessed from both end surfaces in the axial direction, and are inserted through the through holes. In a method of manufacturing a power transmission component having a roller support and curing portion that has been cured at the center portion between both ends, and the roller support and curing portion being rotatably disposed in the roller support and curing portion,
A curing treatment step for forming a backup curing portion by performing a surface curing treatment on the inner peripheral side portion at the insertion arrangement end, and
An assembly step in which the support pins are inserted into the through holes and the insertion holes of the rollers, and the support pins are spanned over the pair of support walls;
A caulking recess is formed in the uncured portion on the axial end face of the insertion arrangement end by caulking tool so that the outer peripheral side corner of the insertion arrangement end is directed toward the opening edge of the through hole. And a caulking step of caulking and fixing the insertion arrangement end to the support wall by deforming and moving. Used in a valve opening / closing mechanism in an engine, a roller is supported by a support pin between a pair of support walls, and the pair of support walls has a through hole formed through the pair of support walls on the same line. Each of the support pins has hollow holes formed so as to penetrate along the axial direction or recessed from both end surfaces in the axial direction, and are inserted through the through holes. In a method of manufacturing a power transmission component having a roller support and curing portion that has been cured at the center portion between both ends, and the roller support and curing portion being rotatably disposed in the roller support and curing portion,
Insertion step of inserting a backup member into the hollow hole of the insertion arrangement end,
An assembly step of passing the support pins through the pair of support walls by inserting the support pins into the through holes and the insertion holes of the rollers;
By deforming the outer peripheral side corner of the insertion arrangement end toward the opening edge of the through-hole by forming a caulking recess in the axial end face of the insertion arrangement end by caulking tool, And a caulking step of caulking and fixing the insertion arrangement end portion to the support wall. Used in a valve opening / closing mechanism in an engine, a roller is supported by a support pin between a pair of support walls, and the pair of support walls has a through hole formed through the pair of support walls on the same line. Each of the support pins has hollow holes formed so as to penetrate along the axial direction or recessed from both end surfaces in the axial direction, and are inserted through the through holes. In a method of manufacturing a power transmission component having a roller support and curing portion that has been cured at the center portion between both ends, and the roller support and curing portion being rotatably disposed in the roller support and curing portion,
Using a caulking tool for caulking and fixing the axial end face of the support pin to the support wall, the caulking tool is disposed on the outer peripheral side of the central core part, and a central core part inserted into the hollow hole, An outer periphery caulking portion that forms a depressed caulking recess in the axial end face,
An assembly step of passing the support pins through the pair of support walls by inserting the support pins into the through holes and the insertion holes of the rollers;
With the central core portion inserted into the hollow hole at the insertion arrangement end, the axial end surface of the insertion arrangement end is pressed by the outer periphery caulking portion, and the caulking recess is depressed at the axial end surface. A caulking step of deforming and moving the outer peripheral side corner portion of the insertion arrangement end portion toward the opening edge of the through hole by caulking and fixing the insertion arrangement end portion to the support wall. A method of manufacturing a power transmission component used in a valve opening / closing mechanism characterized by Used in a valve opening / closing mechanism in an engine, a roller is supported by a support pin between a pair of support walls, and the pair of support walls has a through hole formed through the pair of support walls on the same line. Each of the support pins has hollow holes formed so as to penetrate along the axial direction or recessed from both end surfaces in the axial direction, and are inserted through the through holes. In a method of manufacturing a power transmission component having a roller support and curing portion that has been cured at the center portion between both ends, and the roller support and curing portion being rotatably disposed in the roller support and curing portion,
A caulking tool for caulking and fixing the axial end surface of the support pin to the support wall is used, and the caulking tool is used to form a depressed caulking recess in the axial end surface at the pressing tip surface. An outer circumferential side caulking projection, and an inner circumferential side backup projection that is formed on the inner circumferential side of the outer circumferential side caulking projection and projects higher than the outer circumferential side caulking projection,
An assembly step of passing the support pins through the pair of support walls by inserting the support pins into the through holes and the insertion holes of the rollers;
In a state where the inner circumferential backup projection is embedded in the axial end surface of the insertion arrangement end, the axial end surface is pressurized by the outer circumferential caulking projection, and the caulking concave portion is formed in the axial end surface. A caulking step of deforming and moving the outer peripheral side corner of the insertion arrangement end toward the opening edge of the through hole, and caulking and fixing the insertion arrangement end to the support wall. The manufacturing method of the power transmission components used for the valve opening and closing mechanism.

Images