JP2536310Y2 - Induction hardened coil body - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction hardening coil suitable for hardening a pin of a crankshaft.

[0002]

2. Description of the Related Art A conventional technique will be described below with reference to the drawings. FIG. 6 is a front view of a crankshaft taken as an example of a work. As shown in FIG. 6, the crankshaft W has four pins P1 to P4 and five journals J1.
~ J5. The pins P1 and P4 are arranged in the same phase, and the pins P2 and P3 are arranged in a phase 180 ° apart from the pins P1 and P4. That is, the pins P2 and P3 protrude from the axis W1 of the crankshaft W (a straight line connecting the centers of the journals J1 to J5) in the direction opposite to the pins P1 and P4.

For example, when hardening of the pin P1 is taken, FIG.
As shown in FIG. 1, a conventional induction hardened coil body 200 is disposed so as to face a semi-open saddle type high frequency heating coil (hereinafter, the high frequency heating coil is also simply referred to as a heating coil) 210 on both sides below the heating coil 210. A pair of jackets 201 and 202 for injecting the quenching liquid L onto the heated and heated pin P1, and a pair of jackets for maintaining a constant gap distance between the heating coil 210 and the pin P1.
It includes a set of spacers 211, a heating coil 210, jackets 201 and 202, and a coil side plate 209 to which the spacers 211 are fixed.

Note that 203 and 204 are pins
A guide (the material is SUS or S45C or the like) when P1 is carried between the jackets 201 and 202. Also,
212 is a lead conductor to the heating coil 210, one end of which is connected to the heating coil 210 and the other end is an input terminal 213 of the heating coil 210.
Connected to each other. The input terminal 213 is an output terminal of a transformer 215 that supplies a high-frequency current to the heating coil 210.
Connected and fixed to 214. The transformer 215 is suspended from a power matching board (not shown) by wires (not shown).

[0005] In order to quench the pin P1 using the induction hardening coil body 200, first, the crankshaft W is connected to its axial center line.
When W1 is horizontal and the crankshaft W is supported by a center or chuck (not shown) so that the crankshaft W can rotate,
When the crankshaft W is rotated, the center of the pin P1
P11 moves on a circumference W2 around the axis W1. Then, the induction hardened coil body 20 arranged above the shaft core wire W1
0 is lowered in the direction of arrow Y.

At this time, if the center P11 of the pin P1 is
As shown by the solid line in FIG. 5, the position coincides with the horizontal plane W3 passing through the axis W1 (that is, the position where the pin P1 is exactly halfway between the top dead center and the bottom dead center) or at this position. When it is near, the lower surface of the guide 203 of the jacket 201,
Alternatively, the lower surface of the guide 204 of the jacket 202 collides with the upper end of the pin P1. Then, even if the high-frequency quenched coil body 200 is lowered in the collision state, the pin P1 is not carried in between the jackets 201 and 202.

In order to avoid such defects, before lowering the induction hardened coil body 200, the center P11 of the pin P1 must be
Coincides with the vertical plane W4 passing through the axis W1 (2 in FIG. 6).
The crankshaft W is stopped by rotating the crankshaft W to the position indicated by the chain line, that is, the top dead center of the pin P1). Moving the pin to be quenched to the top dead center and stopping the rotation of the rear crankshaft W in this manner is called pin position indexing.

The position of the pin P1 may be determined by rotating the crankshaft W to position the pin P1 at the bottom dead center. In short, it is only necessary that the center P11 of the pin P1 substantially coincides with the vertical plane W4. When quenching all the pins P1 to P4 at the same time, in the crankshaft W shown in FIG.
For example, when the position of the pin P1 is determined, the positions of the pins P2 to P4 are automatically determined.

[0009]

As described above, when quenching a pin of a crankshaft, it is necessary to determine the position of the pin before quenching. Since it takes ~ 4 seconds, when quenching a large number of crankshafts, the entire quenching process of the crankshaft becomes long. The present invention has been made in view of such circumstances, and it is an object of the present invention to provide an induction hardened coil body that does not require pin position indexing, and thus can shorten the hardening process. I have.

[0010]

In order to solve the above problems, the induction hardening coil of the present invention is rotatably supported by a shaft.
Installed directly above the crankshaft
Burn the top pin of the rank shaft pins.
The lower quenching position when inserting and the crankshaft
Above when retracted from the shaft to rotate
High circumference that can be moved up and down over the evacuation position
A wave-quenched coil body, wherein a pin of the crankshaft is provided.
A heating coil for heating the
Cooling jacket, heating coil and jacket.
Are mounted on both sides of the heating coil.
Coil side respectively arranged toward the rank shaft radial direction
A plate, and the coil side plate has the
Rank shaft pin enters and closes to the heating coil
Cuts are formed to
The crankshaft is located on both inner sides,
Even if the pin of the shaft is off the uppermost position,
On the way to lower quenching position
The flared guide surface for returning to
For receiving the pin of the crankshaft.
Horizontal dimension of the lowermost part of the cut corresponding to the part to be cut
The pin is released when the crankshaft rotates.
Slightly larger than the diameter of the outermost circular locus when rolling
Both ends of the guide surface are
Curved to prevent shaft pin damage
Of the crankshaft pin on the guide surface.
It is noted that a protective member for protecting the wound is provided.
It is a sign.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. 1 to 5 are drawings for explaining an embodiment, FIG. 1 is a partially sectional front explanatory view of an induction hardened coil body,
FIG. 2 is an explanatory side view taken along the arrow A in FIG. 1, FIG. 3 is a perspective view of a jacket, FIG. 4 is a perspective view of a jacket of a modified example, and FIG. 5 is a front view of a crankshaft. As the crankshaft as the work, the same crankshaft W for a four-cylinder engine as shown in FIG.

Induction hardening coil body 100 for hardening pin P1
Will be described. The induction hardened coil body for hardening the pins P2 to P4 respectively has the same structure. Induction hardened coil body 100
As shown in FIG. 1, a semi-open saddle type heating coil 30,
A magnetic core 31 provided in the heating coil 30 to concentrate the magnetic flux generated by the heating coil 30 on the surface of the pin P1, a lead conductor 34 of the heating coil 30,
A pair of quenching liquid jet jackets 10 and 20 arranged so as to face downward on both sides of the
A pair of parallel coil side plates to which 10, 20 are attached
41 and 42 (the coil side plate 42 is located on the back side of the coil side plate 41 in FIG. 1) and three sets fixed to the coil side plates 41 and 42 by screws 33 (one set includes the near side in FIG. Back side 2
) Spacers 32.

The induction hardened coil body 100 has an input terminal (not shown), like the induction hardened coil body 200 described in the related art. This input terminal is connected to an output terminal of a transformer (not shown). Here, 100a is the center line of the induction hardened coil body 100.

As shown in FIGS. 1, 2, and 3, a jacket 10 having a hollow portion 10a formed therein.
A plurality of quenching liquid injection holes 12 are formed on a front wall 11 made of aluminum or the like facing the surface 20. A pressure equalizing plate 13 having a plurality of quenching liquid passage holes 14 is provided in the hollow portion 10a of the jacket 10 so as to partition the hollow portion 10a into two spaces. The pressure equalizing plate 13 is provided for equalizing the injection pressure of the quenching liquid supplied to the hollow portion 10a of the jacket 10 from the quenching liquid injection hole 12. Reference numeral 15 denotes a quenching liquid supply pipe attached to the rear wall 11a so as to communicate with an opening 11b provided in the rear wall 11a of the jacket 10.

A pair of parallel side walls 16a and 16b made of SUS or the like are arranged on both sides of the front wall 11 and the rear wall 11a of the jacket 10. The shape of the lower part of the side walls 16a and 16b is
It is formed in a curved shape that gradually moves away from the opponent's jacket 20 from the top to the bottom. Inside the lower part of the side walls 16a and 16b, there is provided a round bar-shaped collar 18 having one end connected to the side wall 16a and the other end connected and fixed to the side wall 16b.

The jacket 20 includes a hollow portion 10a, a front wall 11, a rear wall 11a, side walls 16a and 16b, and a collar 1 of the jacket 10.
8, the quenching liquid injection hole 12, the pressure equalizing plate 13, the quenching liquid passage hole 14, and the opening 11b correspond to the hollow portion 20a and the front wall, respectively.
21, a rear wall 21a, side walls 26a and 26b, a collar 28, a quenching liquid injection hole 22, a pressure equalizing plate 23, a quenching liquid passage hole 24, and an opening 21b.

The side walls 16a and 16 of the jacket 10 are
b, the horizontal distance of the lowest point 19 from the axis W1 (ie, the shortest distance between the lowest point 19 and the vertical plane W4 passing through the axis W1) is L, and the top dead center and the bottom dead center Horizontal distance of the center P11 of the pin P1 that is located exactly in the middle from the axis W1 (that is, the distance between the center P11 and the axis W1 when the center P11 of the pin P1 is on a horizontal plane W3 passing through the axis W1). ) Is M, the lower portions of the side walls 16a and 16b are formed such that L> M. Regarding the horizontal distance between the lowermost point 29 of the side walls 26a and 26b and the axis W1, the side walls 16a and 16b
Is the same as the lowermost point 19 of.

Next, the induction hardened coil body 100 of this embodiment
A method of quenching the pins P1 to P4 of the crankshaft W using the method will be described. First, a vertical plane passing through the axis W1 above the horizontally and rotatably supported crankshaft W
The induction hardened coil body 100 is arranged at W4 such that the center line 100a of the induction hardened coil body 100 coincides. Pins P2 to P4
The three induction hardened coil bodies (not shown) corresponding to the above are also arranged in the same manner.

Next, all the induction hardened coil bodies including the induction hardened coil body 100 are lowered in the direction of arrow Y by an elevating device (not shown). Regarding the pin P1, the lower portions of the side walls 16a and 16b of the jacket 10 come into contact with the pin P1 as shown by the dotted line in FIG. At this time, the position where the pin P1 is farthest from the axis W1 of the crankshaft W as shown in FIG. 1 (a position exactly intermediate between the top dead center and the bottom dead center).
In this position, the horizontal distance (equal to the distance M from the axis W1 of the center P11 of the pin P1) of the uppermost point P12 of the pin P1 at this position is equal to the side walls 16a, 16 of the jacket 10.
It is smaller than the horizontal distance L of the lowermost point 19 of b from the axis W1.

Therefore, as the induction hardening coil body 100 descends, the pin P1 is moved to the mating jacket 20 of the side walls 16a and 16b.
The heating coil 30 is placed on the pin P1 when the high-frequency quenched coil body 100 is easily carried into the space between the jackets 10 and 20 along the elongated surface opposed to the pin P1. When the position of the pin P1 is at a position other than just between the top dead center and the bottom dead center, the pin P1 is, of course, smoothly carried between the jackets 10 and 20.

The pins P2 to P4 are similarly carried between a pair of jackets of the corresponding induction hardened coil bodies,
Finally, each heating coil is mounted on each of the pins P2 to P4. Thereafter, the heating coils are energized for a predetermined period of time while rotating the crankshaft W, and then the quenching liquid is sprayed from each jacket onto the pins P1 to P4 to complete the quenching of the pins P1 to P4.

As shown in FIG. 4, guides 19a and 19b made of rods made of stellite or the like are brazed to the vertically elongated surfaces of the side walls 16a and 16b of the jacket 10 which face the mating jacket 20, respectively. Thus, when the side walls 16a and 16b come into contact with the pin P1, damage to the side walls 16a and 16b can be protected. The same applies to the jacket 20.

[0023]

[Effects of the Invention] As described above, the induction hardened coil body according to the present invention.
If the crankshaft pin is in the uppermost position
Configuration where the pin is automatically corrected even if it deviates greatly from
It is necessary to determine the pin position before quenching.
The quenching process can be shortened,
Accompanying cost reduction can be achieved.

Further , when both ends of the guide surface are curved.
Both have a configuration in which a protection member is provided on the guide surface.
The pin on the crankshaft contacts the coil side plate
To prevent damage to the crankshaft
And it is possible to perform high-grade quenching
It works.

[Brief description of the drawings]

FIG. 1 is a partially sectional front view of an induction hardened coil body according to an embodiment of the present invention.

FIG. 2 is an explanatory side view of an arrow A in FIG. 1;

FIG. 3 is a perspective view of a jacket of the induction hardened coil body according to the embodiment of the present invention;

FIG. 4 is a perspective view of a jacket according to a modified example.

FIG. 5 is a front view of a crankshaft taken as a work.

FIG. 6 is an explanatory diagram of a case where a pin of a crankshaft is quenched with a conventional induction hardened coil body.

[Explanation of symbols]

 10, 20 Jacket 11, 21 Front wall 11a, 21a Rear wall 12, 22 Quenching liquid injection hole 16a, 16b, 26a, 26b Side wall 19a, 19b Guide 30 Heating coil 41, 42 Coil side plate 100 Induction hardened coil body P1 ~ P4 Pin P11 Center L, M Horizontal distance W Crankshaft W1 Shaft core

Claims (1)

(57) [Scope of request for utility model registration] 1. A crankshaft which is rotatably supported.
Of the crankshaft.
Quenching when quenching the top pin
In position to rotate the crankshaft.
Between the upper evacuation position when retreating from the raft
Induction hardened coil body that can be moved up and down
A heating coil for heating the pin of the crankshaft
And a jacket for cooling the pins by spraying a cooling liquid.
And the heating coil and the jacket are attached.
And the crankshaft radial direction on both sides of the heating coil
And coil side plates respectively arranged toward the
And a pin of the crankshaft is provided on the coil side plate.
Notch to get into the heating coil
Is formed on the lower side of the notch
On both inner surfaces, the pins of the crankshaft are at the highest position
From the upper evacuation position to the lower quenching position
To extend the pin back to the uppermost position
Shaped guide surface is formed diagonally to the vertical direction,
It corresponds to the part for receiving the pin of the crankshaft
The lateral dimension at the bottom of the cut is the crankshaft
Outermost when the pin revolves with the rotation of the
It is set slightly larger than the diameter of the circular locus on the side,
Both ends of the guide surface may damage the crankshaft pin.
It has a curved shape to prevent
Protection to protect crankshaft pins from damage
An induction hardened coil body provided with a member.