JP3618690B2 - Camshaft hardening device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a camshaft quenching device that performs induction quenching on a circumferential surface of a cam formed on a camshaft.
[0002]
[Prior art]
In order to perform induction hardening on the circumferential surface of the cam formed on the camshaft, the camshaft is rotatably supported, and the camshaft is rotated about the center of the camshaft and is opposed to the circumferential surface of the cam. Induction heating was performed with the arranged heating coil.
[0003]
[Problems to be solved by the invention]
However, when the cam is induction hardened, the journal portion provided adjacent to the cam may be induction heated. Since this journal portion has a cutting process after the induction hardening of the cam, there is a problem that when the induction hardening is performed, the cutting process cannot be performed.
[0004]
In addition, the heating coil for induction heating the circumferential surface of the cam has a circular heating conductor portion facing the circumferential surface, so that the gap between the convex portion of the cam and the heating conductor portion is different from that of the cam. The gap is smaller than the gap between the portion and the heating conductor. For this reason, the quenching layer formed in the convex part of the cam has a non-uniform depth of the quenching layer that is deeper than the quenching layer formed in the other part.
[0005]
The present invention was devised in view of the above circumstances, and is a camshaft that can solve the problem of preventing induction quenching of the journal part and the problem of intensive heating of the convex part of the cam. It aims to provide a quenching device.
[0006]
[Means for Solving the Problems]
The camshaft quenching apparatus according to the present invention is:A plurality of journal portions formed at predetermined intervals in the axial direction and formed between the journal portionsMultiple types of cams with different phasesAnd havingIn a camshaft quenching apparatus for simultaneously induction-quenching the cam surface of the camshaft, a plurality of heating coils each having a circular heating conductor for heating the cam surface, and the heating coilHeating coil that heats cams with the same phaseSupply current topluralBetween the transformer and the heating coilOf the heating coil that heats the cam with the same phase.The center of the heating conductorConcernedIn a state where the center of the camshaft is shifted,ConcernedRevolve the heating coil around the campluralDrive mechanism, cooling mechanism for cooling the heated cam, and opposed to the journal partA plurality of arranged and for suppressing induction heating of the journal sectionIt is characterized by comprising a concentrating ring.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a schematic configuration diagram of a camshaft quenching apparatus according to a first embodiment of the present invention, and FIG. 2 is a diagram of a main part of the camshaft quenching apparatus according to the first embodiment of the present invention. FIG. 3 is a schematic configuration diagram, FIG. 3 is a schematic configuration diagram showing a drive mechanism of a camshaft quenching apparatus according to the first embodiment of the present invention, and FIG. 4 is a heating diagram of the camshaft according to the first embodiment. FIG. 5 is a schematic explanatory view showing the relationship between the coil and the cam. FIG. 5 is a schematic explanatory view showing the relationship between the heating coil and the cam in the camshaft hardening apparatus according to the first embodiment of the present invention. FIG. 7 is a schematic explanatory view showing the main part of the drive mechanism of the camshaft according to the first embodiment, and FIG. 7 is a figure showing induction hardening by the camshaft hardening apparatus according to the first embodiment of the present invention. FIG. 4A is a schematic front view, and FIG. 8 is a schematic configuration diagram of a camshaft quenching apparatus according to the second embodiment of the present invention, and FIG. 9 is a camshaft quenching apparatus according to the third embodiment of the present invention. FIG. 10 is a schematic configuration diagram of a main part of a quenching device for a camshaft according to a fourth embodiment of the present invention, and FIG. 11 is a fourth embodiment of the present invention. It is a schematic block diagram of the hardening apparatus of the cam shaft which concerns on.
[0008]
Prior to the description of the camshaft quenching apparatus 100 according to the first embodiment of the present invention, two sets of cams, that is, the intake side cam WA1 and the exhaust side cam WA2 are made by the camshaft quenching apparatus 100. The camshaft WA to be induction hardened will be described with reference to FIG. The camshaft WA is provided with two types of cams having different phases, that is, three intake side cams WA1 and two exhaust side cams WA2 arranged outside the intake side cam WA1.AndThe phases of the intake side cam WA1 and the exhaust side cam WA2 are different by 120 °. For example, the intake side cam WA1 is formed by projecting a part of a circle having a radius r1 outward, and the outermost end A that protrudes most and the center of the circle, that is, the center of the cam shaft of the intake side cam WA1. The distance from the WO is r2. Accordingly, the farthest position from the cam shaft center WO of the intake side cam WA1 is the outermost end portion A, and on the straight extension line connecting the outermost end portion A and the center of the cam shaft of the intake side cam WA1. There is an opposite end B on the opposite side. Further, journal portions WAJ are provided on both sides of the camshaft WA. The centers of the intake side cam WA1 and the exhaust side cam WA2 are the same as the center WO of the cam shaft of the camshaft WA. In the following description, the center of the camshaft WA and the centers of both the cams WA1 and WA2 are the same, and are therefore denoted by the same WO.
[0009]
The camshaft quenching apparatus 100 according to the first embodiment of the present invention includes a camshaft WA having both cams WA1 and WA2 formed with an intake side cam WA1 and an exhaust side cam WA2 that are 120 ° out of phase. A camshaft quenching device for induction-quenching the surface simultaneously, wherein the heating conductor portion 111 for heating the peripheral surface of the intake side cam WA1 has three circular intake side heating coils 110 and the exhaust side cam WA2. Two exhaust-side heating coils 120 having a circular heating conductor portion 121 for heating the surface, an intake-side transformer 130 for supplying current to the intake-side heating coil 110, and an electric current to the exhaust-side heating coil 120 The exhaust-side transformer 140, the center 111A of the heating conductor 111 of the intake-side heating coil 110 and the center WO of the cam shaft of the intake-side cam WA1, and the exhaust side In a state in which the center 121A of the heating conductor portion 121 of the heating coil 120 and the center WO of the cam shaft of the exhaust side cam WA2 are shifted, the heating coils 110, 120 are connected to the center 111A of the cam shafts of both the cams WA1, WA2. A driving mechanism 150 for revolving motion 121A, a cooling mechanism (not shown) for cooling both heated cams WA1 and WA2, and a concentrating ring 160 facing the journal portions WAJ provided at both ends of the camshaft WA. And.
[0010]
The three intake-side heating coils 110 include a circular heating conductor portion 111 and a pair of power supply conductor portions 112 that connect the heating conductor portion 111 and the intake-side transformer 130. These three intake side heating coils 110 are connected in series to one intake side transformer 130.
[0011]
The two exhaust-side heating coils 120 include a circular heating conductor portion 121 and a pair of power supply conductor portions 122 that connect the heating conductor portion 121 and the exhaust-side transformer 140. These two exhaust-side heating coils 120 are connected in series to one exhaust-side transformer 140.
[0012]
The intake side heating coil 110 and the exhaust side heating coil 120 are formed by bending a copper pipe. The intake side heating coil 110 and the exhaust side heating coil 120 are configured so that cooling water is circulated therein in order to prevent overheating.
[0013]
The basic configurations of both the heating coils 110 and 120 are substantially the same. However, as shown in FIG. 7, the intake side cam WA1 and the exhaust side cam WA2 have different thickness dimensions and quenching patterns. The width dimensions of the heating conductor portions 111 and 121 are determined in consideration of the quenching pattern and the like for the cams WA1 and WA2 to be heated.
[0014]
The drive mechanism 150 includes an intake side mounting 151 on which the intake side transformer 130 is mounted, an exhaust side mounting table 152 on which the exhaust side transformer 140 is mounted, and lower surfaces of both mounting tables 151 and 152, respectively. Provided bearings 153, 154, eccentric cams 155, 156 connected to the bearings 153, 154, rotating shafts 157, 158 respectively connected to the eccentric cams 155, 156, and rotating shafts 157, 158 And a drive unit 159 for applying a rotational force to the motor. The cam shaft centers 155A and 156A of the eccentric cams 155 and 156 do not coincide with the centers 157A and 158A of the rotary shafts 157 and 158, and the centers 157A and 158A of the rotary shafts 157 and 158 are the two heating coils 110, It is shifted outward by 120 eccentricity (r1-r2) / 2. Further, since the exhaust cam WA2 and the intake cam WA1 are 120 ° out of phase, the eccentric cams 155 and 156 corresponding to both cams WA1 and WA2 are also 120 ° out of phase.
[0015]
For example, the amount of eccentricity (r1-r2) / 2 of the eccentric cam 155 on the side corresponding to the intake side cam WA1 is equal to the outermost end A and the intake side cam farthest from the center WO of the cam shaft of the intake side cam WA1. When the distance between the center of WA1 is r1, and the distance between the opposite end B of the position on the extended line of the straight line connecting the two and the center WO of the cam shaft of the intake side cam WA1 is r2, It is set equal to r≈ (r1−r2) / 2, which is the radius of the revolving motion of the intake side heating coil 110. In addition, although it is preferable that r which is the radius of this revolution motion does not increase / decrease, there is some increase / decrease in actual induction quenching.
[0016]
That is, as will be described later, since the center WO of the cam shaft WA is fixed, the intake-side heating coil 110 performs a revolving motion with the center WO of the cam shaft WA as a base point. Become.
[0017]
On the other hand, the relationship between the exhaust side heating coil 120 and the camshaft WA is the same as the relationship between the intake side heating coil 110 and the camshaft WA except that the phase is shifted by 120 °.
[0018]
The drive unit 150 includes a drive motor (not shown) that rotates the camshaft WA, and a pair of timing belts 159A and 159B that transmit the force of the drive motor to the rotary shafts 157 and 158. For this reason, the camshaft WA and both the transformers 130 and 140 are driven in synchronization.
[0019]
Further, as described above, the drive unit 150 rotationally drives the cam shaft WA with the center WO of the cam shaft of the cam shaft WA, that is, the center WO of the cam shafts of both the cams WA1 and WA2. .
[0020]
Although not shown, a cooling jacket as a cooling mechanism for injecting a cooling liquid to both heated cams WA1 and WA2 is disposed around both heating coils 110 and 120. At this time, it is important to set the supply path for supplying the coolant to the cooling jacket so as not to interfere with the movement of each part.
[0021]
On the other hand, the journal part WAJ provided on the camshaft WA is provided with a substantially ring-shaped outlet ring 160 which is opposed to the journal part WAJ with a predetermined interval.
[0022]
Therefore, induction hardening of the camshaft WA by the camshaft hardening apparatus is performed as follows.
The camshaft WA is such that the intake side cam WA1 of the camshaft WA is inside the heating conductor portion 111 of the intake side heating coil 110 and the exhaust side cam WA2 is inside the heating conductor portion 121 of the exhaust side heating coil 120. WA is set in the drive unit 150. Then, the concentrating ring 160 comes to face the journal part WAJ.
[0023]
When the amount of eccentricity is (r1-r2) / 2, current is supplied from both transformers 130 and 140 to both heating coils 110 and 120, respectively. At the same time, the drive motor of the drive unit 150 is driven to rotate the camshaft WA about the center WO of its own camshaft. The power of the drive motor is transmitted to the respective rotating shafts 157 and 158 by the timing belts 159A and 159B. Therefore, the intake side mounting table 151 and the exhaust side mounting table 152 that are revolved by the rotation shafts 157 and 158 move as shown in FIG. That is, both the mounting tables 151 and 152 perform a rotational movement with a radius r≈ (r1−r2) / 2 in a state where the phases are shifted by 120 °.
[0024]
Since both heating coils 110 and 120 are attached to both transformers 130 and 140 mounted on both mounting tables 151 and 152, they perform the same rotational movement. For example, the intake-side heating coil 110 that heats the intake-side cam WA1 has a radius r≈ (r1-r2) / based on the center WO of the cam shaft of the camshaft WA, that is, the center WO of the cam shaft of the intake-side cam WA1. Perform 2 revolutionary movements.
[0025]
Specifically, the intake-side heating coil 110 performs a motion as shown in FIG. As shown in FIG. 4A, when the outermost end portion A of the intake side cam WA1 is at a position of 180 °, the center WO of the cam shaft of the intake side cam WA1 is the heating conductor portion of the intake side heating coil 110. It is shifted from the center 111A of 111 in the direction of 0 ° by (r1-r2) / 2.
[0026]
When the camshaft WA rotates 90 ° counterclockwise, that is, as shown in FIG. 4B, when the outermost end A of the intake side cam WA1 is at a position of 270 °, the cam of the intake side cam WA1 The shaft center WO is shifted from the center 111A of the heating conductor 111 of the intake-side heating coil 110 by 90 degrees in the direction of (r1-r2) / 2.
[0027]
When the camshaft WA further rotates 90 ° counterclockwise, that is, as shown in FIG. 4C, when the outermost end A of the intake side cam WA1 is at the 0 ° position, the intake side cam The center WO of the cam shaft of WA1 is shifted from the center 111A of the heating conductor portion 111 of the intake side heating coil 110 in the direction of 180 ° by (r1-r2) / 2.
[0028]
Further, when the camshaft WA further rotates 90 ° counterclockwise, that is, as shown in FIG. 4D, when the outermost end A of the intake side cam WA1 is at the 90 ° position, the intake side cam The center WO of the cam shaft of WA1 is shifted in the direction of 270 ° by (r1−r2) / 2 from the center 111A of the heating conductor 111 of the intake side heating coil 110.
[0029]
That is, the intake-side heating coil 110 has undergone a revolving motion with a radius (r1-r2) / 2 around the center WO of the cam shaft of the intake-side cam WA1.
[0030]
Since the intake side heating coil 110 performs such revolving motion, the distance between the outermost end A of the intake side cam WA1 and the heating conductor portion 111 of the intake side heating coil 110 is always the cam shaft. Since the distance between the opposite end B of the straight line connecting the center WO and the outermost end A and the heating conductor 111 is kept substantially equal, the circumference of the intake cam WA1 Uniform heating of the surface is ensured.
[0031]
Further, since the exhaust side cam WA2 is the same as the intake side cam WA1, the distance between the outermost end A of the exhaust side cam WA2 and the heating conductor portion 121 of the exhaust side heating coil 120 is opposite. The distance between the side end portion B and the heating conductor portion 121 is kept substantially equal, and uniform heating to the peripheral surface of the exhaust side cam WA2 is ensured.
[0032]
When the cams WA1 and WA2 are heated, since the concentrating ring 160 is opposed to the journal part WAJ, the induction heating of the journal part WAJ by the induced current can be reduced.
[0033]
When the predetermined heating is performed, the cooling liquid is jetted from the cooling jacket, and induction hardening is performed on both cams WA1 and WA2. At this time, since the liquid shielding member 161 is provided on the concentrating ring 160 facing the journal portion WAJ, the cooling liquid does not reach the journal portion WAJ.
[0034]
In the first embodiment described above, the revolving motion of both the heating coils 110 and 120 is performed by the force from the drive motor that rotationally drives the camshaft WA. However, as shown in FIG. The four servo motors 259A, 259B, 259C, and 259D can be used to perform the revolving motion.
[0035]
In the camshaft quenching apparatus 200 according to the second embodiment, a guide 251A in the left-right direction is provided on the bottom surface of the intake-side mounting table 251 on which the intake-side transformer 230 is mounted, and the side surface of the intake-side transformer 230 is placed. The upper and lower guides 251B are provided respectively, and two servo motors 259A and 259B to which the corresponding feed screws 259a and 259b are attached are provided. That is, by making the intake side mounting table 251 movable in two directions orthogonal to each other, the same revolving motion as that in the above-described camshaft quenching apparatus 100 is performed.
[0036]
In this case, the exhaust heating coil 220 has the same two servo motors 259C and 259D, feed screws 259c and 259d driven by the servo motors 259C and 259D, and a guide 2521A corresponding to the feed screws 259c and 259d. Needless to say, a drive mechanism using 252B or the like is provided.
[0037]
As described above, the driving unit 250 using the servo motors 259A, 259B, 259C, and 259D can relatively easily both heating coils only by changing the control signal for controlling the driving of the servo motors 259A, 259B, 259C, and 259D. It becomes possible to change the trajectory of the movements 210 and 220. That is, when the eccentric shafts 155 and 156 and the timing belts 159A and 159B described above are mechanical, when the camshaft is changed and the trajectory of the revolving motion is changed, the eccentric cams 155 and 156, etc. Since the exchange is necessary, the change requires a certain amount of time. However, if the control signal is simply changed, it does not require much time, and there is an effect that the change becomes easy.
[0038]
In the two embodiments described above, the camshaft shown in FIG. 7 has been described, but it goes without saying that the present invention is not limited to this camshaft WA.
[0039]
In the above-described two embodiments, the heating coils 110 and 120, the concentrating ring 160, and the liquid shielding member 161 are described as separate members. However, as shown in FIG. The concentrating ring 160 and the liquid shielding member 161 may be provided on the side plate 123 of 120. An arm 123A made of an insulating material is extended from the side plate 123 that constitutes the exhaust-side heating coil 120, and a water-cooled outlet ring 160 is attached to the tip of the arm 123A.
[0040]
Thus, when the concentrating ring 160 and the liquid shielding member 161 are attached to the exhaust-side heating coil 120, the concentrating ring 160 and the liquid-shielding member 161 revolve together with the revolving motion of the exhaust-side heating coil 120. become. Then, it is possible to prevent overheating of the most easily heated portion in the journal portion WAJ, that is, the opposite end B of the exhaust side cam WA2.
[0041]
In the embodiment described later, the radius r of the revolving motion of each of the heating coils 110 and 120 is set such that the outermost end A at the farthest position from the center WO of the cam shaft of each of the cams WA1 and WA2 and the cams WA1 and WA2. The distance between the cam shaft center WO is r1, and the distance between the opposite end B located on the extension of the straight line connecting the two and the cam shaft center WO of the cams WA1 and WA1 is r2. It has been described that r≈ (r1−r2) / 2 centered on the center WO of the cam shafts of the cams WA1 and WA2, but from the cam shape and quenching specification, 0 to (r1−r2). Any numerical value between / 2 is also possible.
[0042]
When the radius r of the revolving motion is 1.5 to 3.0 mm, when the camshaft WA is passed inside the heating conductors 111 and 121 of the heating coils 110 and 120, the cams WA1 and WA2 are not caught and smoothly. There is an effect of passing.
[0043]
Furthermore, in the two embodiments described above, an example of quenching by one bore is shown, but even a camshaft WB corresponding to, for example, three bores used in a so-called V6 engine as shown in FIG. Good. In this case, since each cam has three phases shifted by 120 °, three transformers 130A, 130B, and 130C are used. That is, the intake side cam of the first bore and the exhaust side cam of the second bore have the same phase, the exhaust side cam of the first bore and the intake side cam of the third bore have the same phase, and the second bore The intake side cam and the exhaust bore cam of the third bore have the same phase.
[0044]
Therefore, as shown in FIG. 11, the first transformer 130A induction-heats the three first intake-side heating coils 110B1 for induction-heating the intake-side cam of the first bore and the exhaust-side cam of the second bore. A current is supplied to the two second exhaust side heating coils 120B2. Note that a total of five heating coils 110B1 and 120B2 are connected in series and have equal current amounts.
[0045]
Further, as shown in FIG. 11, the second transformer 130B induction-heats the two first exhaust-side heating coils 120B1 for induction-heating the exhaust-side cam of the first bore and the intake-side cam of the third bore. A current is supplied to the three third intake side heating coils 110B3. Note that a total of five heating coils 120B1 and 110B3 are connected in series and have equal current amounts.
[0046]
Further, as shown in FIG. 11, the third transformer 130C induction heats the three second intake side heating coils 110B2 for induction heating the intake side cam of the second bore and the exhaust side cam of the third bore. A current is supplied to the two third exhaust side heating coils 120B3. Note that a total of five heating coils 110B2 and 120B3 are connected in series and have equal current amounts.
[0047]
As shown in FIG. 10, the first exhaust-side heating coil 120B1 has a concentrating ring 160B1, the second exhaust-side heating coil 120B2 has a concentrating ring 160B2, and the third exhaust-side heating coil 1120B3. Are each provided with a concentrating ring 160B3.
[0048]
【The invention's effect】
The camshaft quenching apparatus according to the present invention is:A plurality of journal portions formed at predetermined intervals in the axial direction and formed between the journal portionsMultiple types of cams with different phasesAnd havingIn a camshaft quenching apparatus for simultaneously induction-quenching the cam surface of the camshaft, a plurality of heating coils each having a circular heating conductor for heating the cam surface, and the heating coilHeating coil that heats cams with the same phaseSupply current topluralBetween the transformer and the heating coilOf the heating coil that heats the cam with the same phase.Revolve the heating coil around the cam with the center of the heating conductor and the center of the cam shaft shifted.pluralDrive mechanism, cooling mechanism for cooling the heated cam, and opposed to the journal partA plurality of arranged and for suppressing induction heating of the journal sectionConcentrate withIt has a configuration.
[0049]
For this reason, according to this camshaft quenching apparatus, the problem of induction quenching of the journal portion can be solved.
[0050]
Further, another camshaft quenching apparatus according to the present invention is a camshaft quenching apparatus that simultaneously induces and quenches the cam circumferential surface of the camshaft in which a plurality of types of cams having different phases are formed, A plurality of heating coils each having a circular heating conductor for heating the peripheral surface of the cam; a transformer for supplying a current to the heating coil; a center of the heating conductor of the heating coil; and a center of the cam shaft of the cam. A drive mechanism that causes the heating coil to revolve around the cam shaft of the cam, a cooling mechanism that cools the heated cam, and a concentrator that faces the journal adjacent to the cam. The concentrator is provided adjacent to the heating coil, and the heating coil is supplied with current in series from the same transformer in the same phase. There.
[0051]
In this camshaft quenching device, the concentrating ring is attached to the heating coil and revolves in the same way as the heating coil, so the most easily heated part in the journal part, that is, the opposite end of the exhaust side cam Can be prevented from overheating.
[0052]
Further, in the camshaft quenching apparatus, the distance between the outermost end portion farthest from the middle of the cam and the center of the camshaft of the cam is r1, and the camshaft quenching device is located on a linear extension line connecting the two. When the distance between the opposite end and the center of the cam shaft of the cam is r2, the radius of the revolving motion of the heating coil is r≈ (r1−r2) / When it is set to 2, a hardened layer having the same depth as that of the other portion is formed at the outermost end portion which is the most protruding portion of the cam.
[0053]
Further, if a liquid shielding member that prevents the coolant from the cooling mechanism from being applied to the journal portion is attached to the concentrating ring, induction quenching is not performed on the journal portion, so that the subsequent cutting process can be performed.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a camshaft hardening apparatus according to a first embodiment of the present invention.
FIG. 2 is a schematic configuration diagram of a main part of the quenching device for a camshaft according to the first embodiment of the present invention.
FIG. 3 is a schematic configuration diagram showing a drive mechanism of the camshaft quenching apparatus according to the first embodiment of the present invention.
FIG. 4 is a schematic explanatory view showing a relationship between a heating coil and a cam of the camshaft according to the first embodiment.
FIG. 5 is a schematic explanatory view showing a relationship between a heating coil and a cam in the camshaft hardening apparatus according to the first embodiment of the present invention.
FIG. 6 is a schematic explanatory diagram showing a main part of a camshaft drive mechanism according to the first embodiment;
FIG. 7 is a drawing of a camshaft subjected to induction hardening by the camshaft hardening apparatus according to the first embodiment of the present invention, wherein FIG. 7 (A) is a schematic front view, FIG. (B) is a schematic side view.
FIG. 8 is a schematic configuration diagram of a camshaft hardening apparatus according to a second embodiment of the present invention.
FIG. 9 is a schematic configuration diagram of a main part of a quenching device for a camshaft according to a third embodiment of the present invention.
FIG. 10 is a schematic configuration diagram of a main part of a quenching apparatus for a camshaft according to a fourth embodiment of the present invention.
FIG. 11 is a schematic configuration diagram of a camshaft hardening apparatus according to a fourth embodiment of the present invention.
[Explanation of symbols]
100 Camshaft hardening device
110 Intake side heating coil
120 Exhaust side heating coil
130 Intake side transformer
140 Exhaust side transformer
150 Drive mechanism
160 Outlet ring
161 Liquid shielding member
WA camshaft
WA1 intake side cam
WA2 Exhaust side cam
WAJ Journal Department

Claims (4)

A camshaft that is induction-hardened at the same time with a camshaft cam surface having a plurality of journal portions formed at predetermined intervals in the axial direction and a plurality of types of cams having different phases formed between the journal portions. In the input device,
A plurality of heating coils heating conductor portion is circular for heating the peripheral surface of the cam, and a plurality of transformers for supplying current to the heating coil phase of the heating coil heats the same cam, of the heating coil in a state in which phases are shifted and the centers of the cam shaft of the heating conductor of the heating coil to heat the same cam, and a plurality of drive mechanisms cause the orbital motion of the heating coils around the cam, heated cam A camshaft quenching apparatus comprising: a cooling mechanism for cooling the plurality of concentrators; and a plurality of concentrating rings disposed opposite to the journal portion and for suppressing induction heating of the journal portion . 2. The camshaft hardening apparatus according to claim 1, wherein the concentrating ring is attached to the heating coil side by side in the axial direction . The camshaft hardening apparatus according to claim 1 or 2, wherein the distance between the outermost end portion farthest from the center of the camshaft and the center of the camshaft is r1, and the straight line connecting the two is extended. when the distance between the center of the opposite end and the camshaft is located in line with r2, orbital motion of the radius of the heating coil, r ≒ (r1-r2) centered on the center of the cam shaft / 2 A camshaft quenching device characterized by being set to The camshaft hardening apparatus according to claim 1, 2, or 3, wherein a liquid shielding member is attached to the concentrating ring so as to prevent the coolant from the cooling mechanism from being applied to the journal portion.

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