JPH11320277A - Deburring method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily eliminate a burr to be generated in a cross point of holes by injecting the water jet from a water jet nozzle to the cross point of the holes for water jet peening. SOLUTION: A water jet nozzle 78 is set so as to inject the water jet from a fitting hole 391 side toward an opening part of an insertion hole 46 opened to the fitting hole 391 , namely a cross point of the insertion hole 46 and the fitting hole 391 . The high-pressure water jet is repeatedly injected from the water jet nozzle 78 for the predetermined time so as to perform the water jet peening processing to a free locker arm 21. At this stage, the water jet is desirably injected to the cross point from the water jet nozzle 78 while moving the water jet nozzle 78 in the fitting hole 391 within a range of the predetermined angle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flash removing method for removing flash generated at an intersection of first and second holes provided to intersect a metal member to be processed.

[0002]

2. Description of the Related Art Conventionally, for example, Japanese Unexamined Patent Publication No.
As disclosed in Japanese Patent Publication No.
A first hole into which a roller shaft supporting a roller that comes into rolling contact with the valve operating cam is fitted; and an engagement groove provided on an outer surface of the roller shaft for fixing the roller shaft fitted into the first hole to a rocker arm. And a second hole into which a pin that engages with the second hole is inserted so as to cross each other.

[0003]

In such a rocker arm, burrs occur at the intersection of the first and second holes.
It is not easy to remove the burrs. In particular, when the rocker arm has been subjected to a treatment such as heat treatment for increasing its hardness, it is difficult to remove the burrs, and the diameter of the second hole for inserting the pin is relatively small. Deburring work is difficult.

The present invention has been made in view of the above circumstances, and has as its object to provide a flash removing method capable of easily removing the flash generated at the intersection of the first and second holes. .

[0005]

In order to achieve the above object, an invention according to claim 1 is provided at a crossing portion of first and second holes provided to intersect a metal member to be processed. In removing the generated burrs, a water jet is jetted from a water jet nozzle to the intersection to perform a water jet peening process.

According to such a method, even when the member to be processed is subjected to a treatment for increasing the hardness, the flash generated at the intersection can be easily removed by water jet peening, and the hole diameter is reduced. Since the water jet may be jetted from the water jet nozzle even if it is small, the deburring operation can be easily performed.

According to another aspect of the present invention, a first hole for fitting a roller shaft that supports a roller that is in rolling contact with a valve operating cam, and an engagement provided on an outer surface of the roller shaft are provided. The second to insert the pin engaging the groove
In removing a burr generated at the intersection of the first and second holes from the rocker arm having the hole, a water jet peening process is performed on the rocker arm by directing a water jet nozzle toward the intersection.

According to the method of the second aspect of the present invention, even when the rocker arm has been subjected to a process for increasing the hardness, the burrs generated at the intersection can be easily removed by water jet peening. Even if the hole diameter is small, the water jet can be ejected from the water jet nozzle even if the hole diameter is small, so the deburring work can be easily performed, the pin insertion accuracy into the rocker arm has been improved, and the roller shaft Can be fixed well.

According to a third aspect of the present invention, in addition to the method of the first or second aspect, a water jet is directed from the side of the first hole having a diameter larger than that of the second hole toward the intersection. By jetting the water jet from the nozzle, it becomes easy to set the water jet nozzle, and the deburring operation becomes easier, and turbulent flow is easily generated on the second hole side, which is a small-diameter hole. Removal can be performed more effectively.

According to a fourth aspect of the present invention, in addition to the method of the third aspect, the water jet nozzle is moved in the first hole, so that the water jet nozzle is moved to the second hole side which is a small diameter side. Compared to moving the jet nozzle, the movement range of the water jet nozzle is increased,
The burrs at the intersection can be more effectively removed by applying a water jet to the entire intersection of both holes.

According to the fifth aspect of the present invention, in addition to the method of the first or second aspect of the present invention, the first and second methods are provided.
By injecting a water jet from a water jet nozzle into one of the holes and closing at least one end in the axial direction of the other of the first and second holes, water entering from one of the first and second holes into the other becomes turbulent. And burrs at intersections can be more effectively removed.

According to the invention described in claim 6, in addition to the method of the invention described in claim 1 or 2, the first and second methods are also provided.
Of the holes, a large diameter hole is formed at one axial end of the hole for inserting another insertion member different from the member to be processed,
By setting the water jet nozzle toward the large-diameter hole portion and performing the water jet peening process, the water jet nozzle is set so as to eject the water jet toward the hole for inserting the insertion member. Can be further facilitated, the deburring operation can be further facilitated, and the insertion of the insertion member can be facilitated by using the large-diameter hole as a guide for inserting the insertion member.

According to a seventh aspect of the present invention, in addition to the method of any one of the first to sixth aspects, a water jet peening process is performed by using water mixed with glass beads. Not only is it possible to more effectively remove burrs by impacting the glass beads, but also, after the deburring operation, the impact surface of the glass beads turns the surface of the intersection white to white, It can be easily confirmed that the removal operation has been completed.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on embodiments of the present invention shown in the accompanying drawings.

1 to 6 show a first embodiment of the present invention. FIG. 1 is a longitudinal sectional view showing a part of a valve gear of an internal combustion engine, and is a sectional view taken along line 1-1 of FIG. FIG. 2, FIG. 2 is a plan view taken along arrow 2 of FIG. 1, FIG. 3 is a sectional view taken along line 3-3 of FIG. 2, FIG. 4 is a sectional view taken along line 4-4 of FIG. FIG. 6 is an enlarged sectional view, and FIG. 6 is a perspective view showing a state of the water jet peening process.

Referring to FIG. 1, a cylinder head 11 of an internal combustion engine is provided with a pair of intake valve ports 12 for each cylinder. Both intake valve ports 12 are intake valves V as engine valves.
Are individually opened and closed by the intake valves V
Are slidably fitted to guide cylinders 14 provided on the cylinder head 11, respectively. Valve springs 16 surrounding the stems 13 are provided between the cylinder head 11 and the retainers 15 provided at the upper end of the stems 13 projecting upward from the guide cylinders 14. The intake valves V are biased in a direction to close the intake valve ports 12 by the spring force of the intake valves V16.

Referring also to FIGS. 2 to 4, a valve gear 17 is connected to both intake valves V, V.
The valve gear 17 is connected to a crankshaft (not shown) at a reduction ratio of 1/2 and is connected to a camshaft 18 and one of the two intake valves V.
Linked to the drive rocker arm 19 and the other of the two intake valves V,
Second drive rocker arm 2 as a member to be connected
0, a free rocker arm 21 as a member to be processed which can be free with respect to both intake valves V, and each of the rocker arms 19, 20, 2 having an axis parallel to the camshaft 18.
1 is provided with a fixed rocker shaft 22 that supports the common rocker 1 and swingably, and an interlocking switching unit 23 that can switch between interlocking and unlocking of the rocker arms 19 to 21.

The camshaft 18 has a high-speed valve operating cam 2.
6 and low-speed valve cams 25, 25 arranged on both sides of the high-speed valve cam 26 corresponding to the two intake valves V, respectively.

The high-speed valve operating cam 26 has a cam profile for opening and closing the two intake valves V in the high-speed operation range of the engine, and has an arc-shaped base circular portion 26a centered on the axis of the camshaft 18. And a high-order portion 26b extending radially outward from the base circle portion 26a. The low-speed valve operating cam 25 has a cam profile for opening and closing the intake valves V... In a low-speed operation range of the engine, and includes a base circular portion 25 a formed in an arc shape centered on the axis of the camshaft 18. The amount of protrusion of the camshaft 18 radially outward from the base circle portion 25a is determined by the high-speed valve operating cam 26.
And a high portion 25b projecting from the base circular portion 25a over a central angle range narrower than the high portion 26b. That is, the high-speed valve operating cam 26 has a cam profile in which the lift amount of the intake valve V is larger than that of the low-speed valve operating cam 25.

The first drive rocker arm 19, the second drive rocker arm 20, and the free rocker arm 21 are arranged adjacent to each other so as to sandwich the free rocker arm 21 between the first and second drive rocker arms 19, 20. It is swingably supported.

First and second drive rocker arms 19, 2
0 are provided integrally with arms 19a, 20a extending toward the intake valves V. The distal ends of the arms 19a, 20a abut against the upper ends of the stems 13 in both intake valves V. Tappet screws 27, 27 are screwed forward and backward freely.

Rocker shaft 22 and tappet screw 2
In the first driving rocker arm 19 between 7 and open vertically so as to form ₁ first and second support walls 31 facing each other in a direction parallel to the axis of the rocker shaft 22, 31 ₂ to both sides An opening 34 is provided, and the first driving rocker arm 1 is arranged such that the cylindrical roller 28 that comes into rolling contact with the low-speed valve operating cam 25 is disposed in the opening 34.
9 rotatably supported. Also the second drive rocker arm 20 between the rocker shaft 22 and the tappet screws 27, to form first and second support walls 32 ₁ facing each other in a direction parallel to the axis of the rocker shaft 22, 32 ₂ to both sides The opening 35 which is opened up and down in the above manner is provided, and the cylindrical roller 29 which is in rolling contact with the low-speed valve operating cam 25 is arranged in the opening 35 so that the second opening is formed.
The drive rocker arm 20 is rotatably supported. More free rocker arm 21, the opposite side and up and down with the rocker shaft 22 so as to form first and second support wall portions 33 facing each other in a direction parallel to the axis ₁ of the rocker shaft 22, 33 ₂ to both sides An opening 36 is provided at the opening 36, and the cylindrical roller 30 that is in rolling contact with the high-speed valve operating cam 26 is rotatably supported by the free rocker arm 21 so as to be disposed in the opening 36.

[0023] The first support wall 31 ₁ in the first driving rocker arm 19, the free rocker arm 21 side first fitting hole 37 ₁ of the open bottom of the is provided parallel to the axis of the rocker shaft 22, the second the support wall 37 _2, the second fitting hole 37 ₂ which is open at both ends is provided with the first fitting bore 37 ₁ coaxially. First fitting hole 38 ₁ in the first support wall 32 ₁ is a free rocker arm 21 side in the second driving rocker arm 20 which is open at both ends is provided parallel to the axis of the rocker shaft 22, the second support wall portions 32 ₂ second fitting hole 38 ₂ of a bottomed opening the free rocker arm 21 side are provided in the first fitting hole 38 ₁ coaxially to. First fitting hole 39 ₁ in the first support wall 33 ₁ is a first driving rocker arm 19 side which is open at both ends is provided parallel to the axis of the rocker shaft 22 in the free rocker arm 21, the second support wall portions 33
The _{2, 2} second fitting hole 39 which is open at both ends is provided with the first fitting bore 39 ₁ coaxially.

The first fitting hole 3 of the first drive rocker arm 19
7 to ₁ cylindrical roller shaft 4 until it abuts against the closed end
One end of 1 is fitted, the second fitting hole 37 ₂ and the other end portion of the roller shaft 41 is fitted. Further, the cylindrical roller shaft 4 is provided in the first fitting hole 38 ₁ of the second drive rocker arm 20.
One end of 2 is fitted, the second fitting hole 38 ₂ and the other end portion of the roller shaft 42 is fitted until it abuts on the closed end. Further, both ends of a cylindrical roller shaft 43 are fitted into the first and second fitting holes 39 ₁ and 39 ₂ of the free rocker arm 21, respectively.

Each of the rocker arms 19, 20, and 21 has a supporting hole 57, 58, and a fitting hole for fitting the rocker shaft 22 so as to be swingably supported by the rocker shaft 22.
59 are provided respectively.

[0026] Referring also to FIG. 5, the first support wall 33 ₁ of the free rocker arm 21, first extends in a direction intersecting a straight line connecting the rocker shaft 22 and the first fitting hole 39 ₁ of the axis insertion holes 46 communicating with 1 fitting bore 39 ₁ of the inner surface is provided, across the large-diameter portion to 46a of the insertion hole 46, 46
b is provided. On the other hand, on the outer surface of the roller shaft 43 so as to correspond to the opening of the insertion hole 46 into the first fitting hole 39 ₁ of the inner surface, along the tangential direction of the virtual circle C centered on the axis of the roller shaft 43 The engaging groove 52 is provided to extend. Insertion hole 4
6, a pin 49 as an insertion member is inserted by, for example, press-fitting so that the intermediate portion is engaged with the engagement groove 52.
The roller shaft 43 is fixed to the free rocker arm 21 by this.

[0027] The second support wall 31 ₂ of the first driving rocker arm 19, the roller shaft 41 is fixed in the same fixed structure and fixed structure to the free rocker arm 21 of the roller shaft 43. That is, the pin 47 as an insertion member which is inserted and fixed in the insertion hole 44 provided in the second support wall portion 31 ₂ of the first drive rocker arm 19 is fitted in the second fitting hole 37 _2. 41 is engaged with an engagement groove 50 provided on the outer surface.

[0028] The first support wall 32 ₁ of the second driving rocker arm 20, the roller shaft 42 is fixed in the same structure as the fixing structure of the free rocker arm 21 of the roller shaft 43. That is, the first support wall portion 32 of the second drive rocker arm 20
Inserted into the insertion hole 45 provided in the _1, pin 48 of the insert member to be fixed, the engaging groove 51 provided on the outer surface of the roller shaft 42 is fitted in the first fitting hole 38 ₁ Are combined.

A needle bearing 53 is interposed between the roller 28 and the roller shaft 41 between the first and second support wall portions 31 ₁ and 31 _{2 of} the first drive rocker arm 19. First and second support walls 32
_A needle bearing 54 is interposed between the roller 29 and the roller shaft 42 between the _first and _second rollers 32 ₁ and 32 _{2, and} between the first and second support walls 33 ₁ and 33 ₂ of the free rocker arm 21. A needle bearing 55 is interposed between the shaft 43.

Below the free rocker arm 21, a lost motion mechanism (not shown) is provided on the cylinder head 11 to apply a spring force to the free rocker arm 21 in the direction of causing the roller 30 of the free rocker arm 21 to roll into contact with the high-speed valve cam 26. ) Is provided. On the other hand, the free rocker arm 21 includes a lost motion receiving portion 56 that receives a spring force from the lost motion mechanism. The lost motion receiving portion 56 includes first and second support wall portions 33 provided in the free rocker arm 21. ₁ , 33
Pin 49 to secure the roller shaft 43 in the first support wall 33 ₁ of the _two insertion, whereas fixed, provided integrally with raised beneath the bottom of the second support wall 33 ₂ Can be

The interlocking switching means 23 is connected to the first
Timing piston 63 capable of switching between interlocking and uncoupling of drive rocker arm 19 and free rocker arm 21
A cylindrical switching piston 64 capable of switching between interlocking and uncoupling of the free rocker arm 21 and the second drive rocker arm 20 adjacent to each other;
A regulating member 65 having a cylindrical shape with a bottom and coming into contact with the switching piston 64 on the opposite side; and a return spring 66 for urging the regulating member 65 toward the switching piston 64.

The timing piston 63 is to be slidably fitted into the roller shaft 41 of the first driving rocker arm 19, blockage of the first fitting hole 37 _1, one end of the roller shaft 41 is fitted A hydraulic chamber 67 is defined between the end and one end of the timing piston 63. An oil passage 68 connected to a hydraulic pressure source via a control valve (not shown) is provided, for example, coaxially in the rocker shaft 22, and a first support wall of the first drive rocker arm 19 is passed through one end of the hydraulic chamber 67. the communication passage 70 provided in the section 33 ₁ to providing communication at all times to the oil passage 68, the communication hole 69 is provided in the rocker shaft 22.

The switching piston 64 is connected to the free rocker arm 21.
Slidably fitted to the roller shaft 43 of the switching piston 6
One end of 4 is brought into contact with the other end of the timing piston 63 so as to allow mutual sliding.

The restricting member 65 is formed in a cylindrical shape with a bottom and is slidably fitted to the roller shaft 42 of the second drive rocker arm 20. The other ends are allowed to contact each other, allowing them to slide. In addition, a retaining ring 73 is mounted on the inner surface of the roller shaft 42 so as to contact the regulating member 65 and prevent the regulating member 65 from dropping off the roller shaft 42. The return spring 66 is connected to the second drive rocker arm 20 at the second position.
It is provided between the closed end and the regulating member 65 of the fitting hole 38 _2, wherein the second fitting hole 38 ₂ of closed end opening hole 74 is bored.

In the interlocking switching means 23, the hydraulic pressure in the hydraulic chamber 67 is relatively low in the low-speed operation range of the engine, and the timing piston 63 and the switching piston 64
Is located at a position corresponding to between the first drive rocker arm 19 and the free rocker arm 21, and the switching piston 64
The contact surface of the regulating member 65 is located at a position corresponding to between the free rocker arm 21 and the second drive rocker arm 20. Therefore, each rocker arm 19, 20, 21 is in a state in which it can relatively swing, and both intake valves V are driven to open and close at a timing and a lift amount corresponding to the low-speed valve cams 25, 25.

In the high-speed operation range of the engine, a relatively high hydraulic pressure is applied to the hydraulic chamber 67 so that the timing piston 6
3 is fitted to the roller shaft 43 of the free rocker arm 21 while pressing the switching piston 64, and the switching piston 64 is fitted to the roller shaft 42 of the second drive rocker arm 20 while pressing the regulating member 65. Therefore, each rocker arm 1
9, 20, 21 are integrally connected, and both intake valves V are driven to open and close at a timing and a lift corresponding to the high-speed valve cam 26.

In such a valve operating device 17, the first self
The rocker arm 19 has a second fitting hole 3 as a first hole.
7_TwoAnd the insertion hole 44 as the second hole cross each other.
The second free rocker arm 20 has
First fitting hole 38 as one hole ₁And the insertion hole as the second hole
45 are provided so as to intersect each other.
A first fitting hole 39 as a first hole is provided in the arm 21.₁When
The insertion hole 46 as the second hole crosses each other.
Provided. Moreover, each fitting hole 37_Two, 38₁, 39₁
By the core when casting each rocker arm 19-21
Each of the insertion holes 44 to 46 is formed.
Means that each of the fitting holes is formed after the rocker arms 19 to 21 are cast.
37_Two, 38₁, 39₁So that the diameter is smaller than
The holes are to be drilled.
After the work, each fitting hole 37_Two, 38₁, 39₁And each insertion hole
It is inevitable that burrs will occur at the intersection with 44-46
No.

Therefore, according to the present invention, the burrs at the intersections are removed by performing a water jet peening process on each of the rocker arms 19 to 21.

At the time of executing the water jet peening process, as shown in FIG. 6, a set jig 76 fixed on a fixed base 75, a high-pressure pump 77 for discharging water at a water pressure of, for example, 245 MPa, and a high-pressure pump 77 Jet nozzle 78 to which the water discharged from the nozzle is supplied
And a pressure gauge 79 for detecting the pressure of the water jetted from the water jet nozzle 78.

Thus, among the rocker arms 19 to 21,
For example, when performing the deburring operation of the free rocker arm 21, the free rocker arm 21 is interposed between the holding plate 80 that closes the support hole 59 of the free rocker arm 21 and the set jig 76, and penetrates the holding plate 80 and the support hole 59. The free rocker arm 21 is set such that the large-diameter hole 46a at one end of the insertion hole 46 faces upward by screwing a bolt 81 to be set into the set jig 76 and tightening.
Set to 6.

The water jet nozzle 78 is
A water jet is set at a position above the free rocker arm 21 from the large-diameter hole portion 46a toward the insertion hole 46.
The water jet peening process is performed on the free rocker arm 21 by repeatedly jetting a high-pressure water jet at a flow rate of about m / sec for a predetermined time.

First and second drive rocker arms 19, 2
0, water jet peening is performed on each rocker arm 1 in the same manner as the free rocker arm 21.
9 and 20.

Next, the operation of the first embodiment will be described.
Then, in each rocker arm 19-21, each fitting hole 3
7_Two, 38₁, 39₁And the intersection of each insertion hole 44-46
The flash generated at the intersections is
Water jet peening process
Removed by treatment. Thus each rocker arm
Suppose that the treatment for increasing the hardness was given to 19-21
Even with water jet peening,
It can be easily removed, and each fitting hole 37 _Two, 38
₁, 39₁And the diameter of each of the insertion holes 44 to 46 is small.
Water jet nozzle 78
Burrs can be easily removed
be able to.

A large-diameter hole 46a is formed at one end of each of the insertion holes 44 to 46, and a water jet nozzle 78 is set toward the large-diameter hole 46a to execute a water jet peening process. This makes it easy to set the water jet nozzle 78 so that the water jet is jetted toward the insertion holes 44 to 46 for inserting the pins 47 to 49, and the deburring operation is further facilitated. No, large-diameter holes 46a ...
Can be used as a guide for inserting the pins 47 to 49 to facilitate insertion of the insertion member.

FIGS. 7 and 8 show a second embodiment of the present invention. FIG. 7 is a longitudinal sectional view showing the state of the water jet peening process, and FIG. 8 is a view taken in the direction of arrow 8 in FIG.

[0046] carrying out the burr removal operation of the free rocker arm 21, between the presser plate 80 and the jig 76, the free rocker arm 21 in a posture in which the opening end facing upward into the fitting hole 39 ₁ of the insertion hole 46 The free rocker arm 21 is set on the set jig 76 by pinching and screwing the bolt 81 into the set jig 76.

The water jet nozzle 78 is
Opening or insertion hole 4 into the fitting hole 39 ₁ of the insertion hole 46
6 and the fitting hole 39 ₁ toward the intersection of the fitting hole 39 ₁
Set so that a water jet spouts from the side,
By repeatedly jetting a high-pressure water jet from the water jet nozzle 78 for a predetermined time,
Water jet peening is performed on the free rocker arm 21.

[0048] At this time, as allowed to move the water jet nozzle 78 in the fitting hole 39 within ₁ in a range of a predetermined angle alpha, it is desirable to eject water jets from the water jet nozzle 78 in the intersecting portion, and the insertion It is desirable that at least one of the axial ends of the hole 46 be closed.

[0049] According to the second embodiment, by injecting the water jet toward the intersection of the insertion hole 46 and the fitting hole 39 ₁ from the fitting hole 39 ₁ it is larger in diameter than the insertion hole 46, It becomes easier to set the water jet nozzle 78, and the deburring operation becomes easier,
In addition, since turbulence easily occurs on the side of the insertion hole 46, which is a small-diameter hole, burrs can be removed more effectively. In addition, by closing one end of the insertion hole 46 in the axial direction, turbulent flow in the insertion hole 46 is more likely to occur, and burrs at the intersection can be more effectively removed.

[0050] Further, by for moving the water jet nozzle 78 in the fitting hole 39 within _1, as compared to move the water jet nozzle 78 in the insertion hole 46 side is the small diameter side, increase the range of movement of the water jet nozzle 78 Then, a water jet is applied to the entire intersection of the two holes 39 ₁ and 46, so that burrs at the intersection can be more effectively removed.

FIG. 9 shows a third embodiment of the present invention. For example, when performing the deburring operation of the free rocker arm 21, the free rocker arm 21 is inserted into the large-diameter hole portion at one end of the insertion hole 46. The high pressure pump 77 and the water jet nozzle 7 are set on the setting jig 76 so that 46a faces upward.
A hopper 82 in which glass beads 83 are stored is connected to a pipeline 84 connecting between the eight. When the water jet nozzle 78 is set at a position above the free rocker arm 21 from the large-diameter hole portion 46a toward the insertion hole 46, a high-pressure water jet is jetted from the water jet nozzle 78. The glass beads 83 are sucked into the water jet nozzle 78, and the water mixed with the glass beads 83 is jetted from the water jet nozzle 78.

As in the third embodiment, the glass beads 8
When the water jet peening process is performed using the water mixed with _{No. 3} , the glass beads 83 impact on the intersection of the fitting hole 391 and the insertion hole 46, and the burrs at the intersection are more effectively removed. It is possible to do. In addition, after the deburring operation, the glass beads 83
The intersection surface turns white due to the shocking collision of
It can be easily confirmed that the deburring operation has been completed.

The water jet peening process using water mixed with the glass beads 83 can be applied to the first and second embodiments.

Although the embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the present invention described in the appended claims. It is possible to do.

For example, in the above embodiment, the roller shaft 41
Through holes 37 ₂ , 38 ₁ , 39 for fitting
₁ and an engagement groove 5 provided on the outer surface of the roller shafts 41 to 43.
Although the example has been described in which the burrs are removed from the rocker arms 19 to 21 having the insertion holes 44 to 46 for inserting the pins 47 to 49 engaged with the pins 0 to 52, the present invention relates to a metal member to be processed. The present invention can be widely applied as a device for removing burrs generated at the intersection of the first and second holes provided to intersect with each other.

[0056]

As described above, according to the first aspect of the present invention, even when the member to be processed is subjected to the treatment for increasing the hardness, the flash generated at the intersection is easily removed by water jet peening. And the deburring operation can be easily performed.

According to the second aspect of the present invention, the burrs generated at the intersection can be easily removed by water jet peening, the burrs can be easily removed, and the pins are inserted into the rocker arm. The roller shaft can be accurately fixed to the rocker arm by improving the accuracy.

According to the third aspect of the present invention, it is easy to set the water jet nozzle, the deburring operation becomes easier, and the deburring can be performed more effectively.

According to the fourth aspect of the present invention, it is possible to increase the moving range of the water jet nozzle and apply a water jet to the entire intersection of the two holes to more effectively remove the burrs at the intersection. .

According to the fifth aspect of the invention, water entering from one of the first and second holes to the other easily becomes turbulent, and burrs at the intersection can be more effectively removed. .

According to the sixth aspect of the present invention, it is easy to set the water jet nozzle so as to jet the water jet toward the hole for inserting the insertion member, thereby making the deburring operation easier. The insertion of the insertion member can be facilitated by using the large-diameter hole as a guide for inserting the insertion member.

According to the seventh aspect of the present invention, not only can the burrs be even more effectively removed by impacting the glass beads, but also the burring operation has been completed. Can be easily confirmed.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a part of a valve gear of an internal combustion engine according to a first embodiment, and is a sectional view taken along line 1-1 of FIG. 2;

FIG. 2 is a plan view as viewed in the direction of arrow 2 in FIG.

FIG. 3 is a sectional view taken along line 3-3 of FIG. 2;

FIG. 4 is a sectional view taken along line 4-4 of FIG. 3;

FIG. 5 is an enlarged sectional view taken along line 5-5 of FIG. 2;

FIG. 6 is a perspective view showing a state of a water jet peening process.

FIG. 7 is a longitudinal sectional view showing a state of a water jet peening process according to a second embodiment.

8 is a view taken in the direction of arrow 8 in FIG. 7;

FIG. 9 is a perspective view illustrating a state of a water jet peening process according to a third embodiment.

[Explanation of symbols]

19: a first drive rocker arm as a member to be processed 20: a second drive rocker arm 21 as a member to be processed 21: a free rocker arm 25, 26 as a member to be processed 25, 26 ... valve cams 28, 29, 30 ... rollers 37 ₂ , 38 ₁ , 39 ₁ ... fitting holes 41, 42, 43 ... roller shafts 44, 45, 46 ... insertion holes 46a as second holes ... Large-diameter holes 47, 48, 49 ... Pins as insertion members 50, 51, 52 ... Engagement grooves 78 ... Water jet nozzles 83 ... Glass beads

Claims (7)

[Claims] 1. A member to be processed made of metal (19, 20, 2)
1) and 1st and 2nd holes (3
7 _2, 38 _1, 39 _1; 44, 45, 46 when removing the burrs produced at the intersection of), applying a water jet peening by injecting water jet from the water jet nozzle (78) to the intersection A flash removing method characterized by the above-mentioned. 2. A first hole (37 ₂ , 37) for fitting a roller shaft (41, 42, 43) for supporting a roller (28, 29, 30) that comes into rolling contact with the valve gear cam (25, 26).
38 ₁ , 39 ₁ ) and second holes (44) into which pins (47, 48, 49) engaging with engagement grooves (50, 51, 52) provided on the outer surface of the roller shafts (41 to 43) are inserted. ~ 4
6) from the rocker arm (19, 20, 21) having the first and second holes (37 ₂ , 38 ₁ , 39 ₁ ;
44. A flash removing method comprising: removing a flash generated at an intersection of the rocker arms (19 to 21) by directing a water jet nozzle (78) toward the intersection. 3. A water jet from the water jet nozzle (78) toward the intersecting portion from the second hole (44 to 46) the first hole is larger in diameter than the (37 _2, 38 _1, 39 ₁₎ side The method for removing burrs according to claim 1 or 2, wherein burrs are injected. 4. The method according to claim 3, wherein the water jet nozzle is moved within the first hole (37 ₂ , 38 ₁ , 39 ₁ ). 5. The first and second holes (37 ₂ , 38 ₁ , 3).
9 ₁ ; 44, 45, 46), a water jet is jetted from a water jet nozzle (78),
And the second hole (37 _2, 38 _1, 39 _1; 44, 45,
The method according to claim 1 or 2, wherein at least one end in the axial direction of the other of (46) is closed. 6. The first and second holes (37 ₂ , 38 ₁ , 3).
9 ₁ ; 44, 45, 46), the members to be processed (19 to
A large-diameter hole (46a) is formed at one end in the axial direction of a hole (44-46) for inserting another insertion member (47, 48, 49) different from 21), and the large-diameter hole is formed. Department (46
3. The method according to claim 1, wherein a water jet nozzle is set toward a) and a water jet peening process is performed. 7. The method for removing burrs according to claim 1, wherein water jet peening is performed using water mixed with glass beads (83).