JP3499486B2 - Multiple cam simultaneous hardening device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multiple cam simultaneous quenching apparatus and a multiple cam simultaneous quenching method for simultaneously heating the circumferential surfaces of cams of a cam shaft on which a plurality of types of cams having different phases are formed.

[0002]

2. Description of the Related Art An induction hardening apparatus as a typical example of this kind of apparatus, as shown in FIG. 11, has a center 911A of a circular heating conductor portion 911 of a heating coil 910 for heating a peripheral surface of a cam 900, The center 900A of the cam 900 is aligned with the center of the cam 900, and a high frequency current is supplied to the heating coil 900 from a transformer (not shown) while rotating the center of the center of the cam 900A. It was heating. This is the same even for a camshaft formed with a plurality of types of cams having different phases.

[0003]

However, the cam 9
00, the most protruding portion, that is, the outermost end 90
Since 1 is closest to the heating conductor portion 911 of the heating coil 910, induction heating is intensively performed, and as shown in FIG. 11 (A), quenching is performed deeper than other portions. Have some defects. In particular, since a plurality of types of cams having different phases are formed on the camshaft that drives the valve of the engine, induction hardening was performed by the heating coil 910 that can handle all the cams.

This is far from the elimination of the essential defect that the outermost end 901 is intensively heated, not the optimum induction hardening.

The present invention has been devised in view of the above circumstances, and even in the case of a camshaft having a plurality of cams with different phases, the outermost ends of the cams are heated intensively. It is an object of the present invention to provide a simultaneous hardening device for a plurality of cams, which can perform the optimum induction hardening for each cam without the need for the same.

[0006]

SUMMARY OF THE INVENTION A multiple cam simultaneous quenching apparatus according to the present invention is a multiple cam simultaneous quenching method for simultaneously induction hardening the circumferential surface of a cam of a cam shaft on which a plurality of types of cams having different phases are formed. In the device, a plurality of heating coils having a circular heating conductor portion for heating the peripheral surface of the cam, a transformer for supplying an electric current to the heating coil, a center of the heating conductor portion of the heating coil and the cam of the heating coil portion. The heating coil is provided with a drive mechanism for causing the heating coil to revolve around a cam in a state of being displaced from the center, and a cooling mechanism for cooling the heated cam, and the heating coils have the same phase. The current is supplied from the same transformer.

The radius r of the revolution of the heating coil is r1, the distance between the center of the cam and the outermost end farthest from the center of the cam, and the opposite side to the position on the extended line of the straight line connecting them. When the distance between the end and the center of the cam is r2, r
≒ (r1-r2) / 2 that is set to.

On the other hand, the method for simultaneously quenching a plurality of cams according to the present invention is a method for simultaneously quenching a plurality of cams, in which the circumferential surfaces of the cams of the cam shaft having a plurality of types of cams having different phases are simultaneously heated. In a state where the center of the heating conductor portion of the plurality of heating coils having a circular heating conductor portion for heating the peripheral surface of the cam is displaced from the center of the cam, the heating coil is revolved around the cam. Further, current is supplied from the same transformer to the heating coil which heats the cam in the same phase.

The radius r of the revolution of the heating coil is r1, the distance between the center of the cam and the outermost end of the position farthest from the center of the cam, and the opposite side to the position on the extension line of the straight line connecting the two. When the distance between the end and the center of the cam is r2, r
≒ (r1-r2) / 2 that is set to.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic configuration diagram of an entire multi-cam simultaneous quenching apparatus according to a first embodiment of the present invention, and FIG. 2 is a plurality according to the first embodiment of the present invention. FIG. 4 is a schematic side view of a cam simultaneous quenching device, FIG. 3 is an explanatory view showing a positional relationship between one heating coil and a cam of the multiple cam simultaneous quenching device according to the first embodiment of the present invention, and FIG. Explanatory drawing which shows the relationship between one heating coil and the cam of the multiple cam simultaneous quenching apparatus which concerns on the 1st Embodiment of this invention, FIG. 5: The multiple cam simultaneous quenching which concerns on the 1st Embodiment of this invention. FIG. 6 is an explanatory view showing a main part of one moving mechanism of the quenching device, and FIG. 6 is a schematic diagram of a cam shaft in which induction hardening is performed on a cam by the multiple cam simultaneous quenching device according to the first embodiment of the present invention. 1A is a schematic front view, FIG. 1B is a schematic side view, and FIG. FIG. 8 is a schematic side view of a multiple cam simultaneous quenching device according to an embodiment, FIG. 8 is a schematic side view of a multiple cam simultaneous quenching device according to a third embodiment of the present invention, and FIG. FIG. 2A is a diagram of a cam shaft on which induction hardening of cams is performed by the multiple cam simultaneous quenching device and the multiple cam simultaneous quenching device according to the embodiment of the present invention. FIG. The figure, the same figure (B) is a schematic side view of a camshaft, the same figure (C) is a schematic block diagram of a simultaneous hardening apparatus for a plurality of cams, and FIG. 10 is a simultaneous plural cams according to another embodiment of the present invention. It is drawing of the cam shaft which induction hardening of the cam is carried out by a hardening apparatus, and a simultaneous hardening apparatus of a plurality of cams, the figure (A) is a schematic front view of a cam shaft, and the figure (B) is a cam. A schematic side view of the shaft, FIG. 6C is a schematic configuration diagram of a simultaneous hardening device for a plurality of cams. That.

Prior to the description of the multiple cam simultaneous hardening device 100 according to the first embodiment of the present invention, two sets of cams, that is, an intake side cam WA1 and an exhaust side cam, are used by the multiple cam simultaneous hardening device 100. A camshaft WA in which WA2 and induction hardening are performed will be described with reference to FIG. The camshaft WA has two types of cams having different phases, that is, three intake side cams WA1 and the intake side cam WA.
There are two exhaust side cams WA2 arranged on the outside of 1. Then, the intake side cam WA1 and the exhaust side cam W
The phase is different from A2 by 120 °. For example, the intake side cam WA1 is formed by projecting a part of a circle having a radius r1 toward the outside, and the outermost end A of the most protruding side and the center of the circle, that is, the center W0 of the intake side cam WA1. The distance between them is r2. Therefore, the position farthest from the center W0 of the intake side cam WA1 is defined as the outermost end A, and the opposite side located on the extension line of the straight line connecting the outermost end A and the center W0 of the intake side cam WA1. Is the opposite end B. Also, at both ends of this cam shaft WA, the journal WA
J is provided. The intake side cam WA1 and the exhaust side cam WA2 each have a center W0 that is the same as the center W0 of the camshaft WA. In the following description, the center of the cam shaft WA and the centers of the cams WA1 and WA2 are the same, and therefore the same W0 is used.

In the multiple cam simultaneous quenching apparatus 100 according to the first embodiment of the present invention, both cams WA1 and WA2 of a cam shaft WA in which an intake side cam WA1 and an exhaust side cam WA2 having different phases by 120 ° are formed. Multiple cam simultaneous quenching device for simultaneously induction hardening the circumferential surface of the intake side cam WA1
Three intake side heating coils 110 each having a circular heating conductor portion 111 for heating the peripheral surface thereof, and two exhaust side heating coils 120 each having a circular heating conductor portion 121 for heating the peripheral surface of the exhaust side cam WA2. An intake side transformer 130 that supplies a current to the intake side heating coil 110 and an exhaust side transformer 140 that supplies a current to the exhaust side heating coil 120.
And the heating conductor portion 111 of the intake side heating coil 110.
111A of the intake side cam WA1 and the center W0 of the intake side cam WA1 are displaced from each other, and the center 121A of the heating conductor portion 121 of the exhaust side heating coil 120 and the center W0 of the exhaust side cam WA2 are displaced from each other. Heating coils 110, 1
A drive mechanism 150 that causes the 20 to revolve around the center W0 of both cams WA1 and WA2, and both heated cams W
And a cooling mechanism (not shown) for cooling A1 and WA2.

The three intake side heating coils 110 are
A circular heating conductor portion 111 and a pair of power feeding conductor portions 1 connecting the heating conductor portion 111 and the intake transformer 130.
12 and. These three intake side heating coils 110 are connected in parallel to one intake side transformer 130.

The two exhaust side heating coils 12 are also provided.
0 is a circular heating conductor portion 121 and this heating conductor portion 12
1 and a pair of power feeding conductors 122 connecting the exhaust side transformer 140. These two exhaust side heating coils 120 are connected in parallel to one exhaust side transformer 140.

The intake side heating coil 110 and the exhaust side heating coil 120 are formed by bending a pipe made of copper or the like. In addition, the intake side heating coil 110 and the exhaust side heating coil 120 are designed to circulate a cooling liquid inside in order to prevent overheating of themselves.

Although both heating coils 110 and 120 have substantially the same basic structure, as shown in FIG. 6A, since the intake side cam WA1 and the exhaust side cam WA2 have different thickness dimensions, The width dimensions of the heating conductors 111 and 121 are the same as those of the respective cams WA to be heated.
It matches with 1 and WA2.

The drive mechanism 150 includes an intake side mounting base 151 on which the intake side transformer 120 is mounted, an exhaust side mounting base 152 on which the exhaust side transformer 140 is mounted, and both mounting bases 151, 152. Bearings 153 and 154 provided on the lower surfaces, eccentric cams 155 and 156 supported by the bearings 153 and 154, and rotary shafts 157 and 1 connected to the eccentric cams 155 and 156, respectively.
58 and a drive unit 159 that applies a rotational force to the rotary shafts 157 and 158. The eccentric cams 155, 15
The centers 155A and 156A of 6 and the centers 157A and 158A of the rotating shafts 157 and 158 do not coincide with each other, and the rotating shafts 157 and
The center of 158, 157A and 158A are both heating coils 1
The eccentricity of (10, 120) (r1−r2) / 2 is offset to the outside. Further, the exhaust side cam WA2 and the intake side cam WA
Since the phase is 120 ° different from that of 1, both cams WA1,
The eccentric cams 155 and 156 corresponding to WA2 also have a phase of 12
It will be offset by 0 °.

For example, the eccentric amount (r1-r2) / 2 of the eccentric cam 155 on the side corresponding to the intake side cam WA1 is the outermost end A at the position farthest from the center W0 of the intake side cam WA1 and the intake side cam WA1. R1 is the distance from the center W0 of the engine, and the intake side cam W and the end opposite to the position on the extension line of the straight line connecting the two
When the distance from the center W0 of A1 is r2, the radius r of the revolution of the intake side heating coil 110 is r≈ (r1-r
2) / 2 is set to be equal. It should be noted that it is preferable that the radius r of the revolution movement does not increase or decrease, but there is a slight increase or decrease in the actual induction hardening.

That is, as will be described later, since the center W0 of the camshaft WA is fixed, the intake side heating coil 110 makes an orbital motion with the center W0 of the camshaft WA as a base point.

On the other hand, the relationship between the exhaust-side heating coil 110 and the camshaft WA is the same as the relationship between the intake-side heating coil 110 and the camshaft WA, only with a phase difference of 120 °.

The drive unit 159 comprises a drive motor (not shown) for rotating the cam shaft WA, and a pair of timing belts 159A, 159B for transmitting the force of the drive motor to the rotary shafts 157, 158. ing. Therefore, the camshaft WA and both transformers 13
It will be driven in synchronization with 0 and 140.

Further, as described above, the drive unit 159 controls the camshaft WA to be the center W0 of the camshaft WA,
That is, the cams WA1 and WA2 are rotationally driven from the center W0 of the cams WA1 and WA2.

Although not shown, a cooling jacket as a cooling mechanism for injecting a cooling liquid into both heated cams is arranged around both heating coils 110 and 120. At this time, it is important to set the supply path for supplying the cooling liquid to the cooling jacket so as not to interfere with the movement of each part.

Therefore, the simultaneous quenching apparatus 100 for plural cams.
The induction hardening of the camshaft WA is performed as follows. The intake side cam WA1 of the camshaft WA is inside the heating conductor section 111 of the intake side heating coil 110, and the exhaust side cam WA2 is inside the heating conductor section 121 of the exhaust side heating coil 120. WA
Is set in the drive unit 159.

In this state, both heating coils 110, 120
A high-frequency current is supplied to each of the transformers 130 and 140. At the same time, the drive motor of the drive unit 159 is driven to rotate the camshaft WA around its own center W0. The force of the drive motor is generated by the timing belts 159A and 159B.
158. Therefore, the rotary shafts 157, 158
The intake-side mounting table 151 and the exhaust-side mounting table 152, which are revolved by the orbit, move as shown in FIG. That is,
Both the mounting tables 151 and 152 perform a circular motion with a radius r≈ (r1−r2) / 2 in a state where the phases are shifted by 120 °.

Both heating coils 110 and 120 are mounted on both mounting tables 151 and 152, and both transformers 130 and 140 are mounted.
The same circular movement is performed because it is attached to. For example, the intake side heating coil 1 for heating the intake side cam WA1
10 is a radius r≈ (r1-r with the center W0 of the camshaft WA, that is, the center W0 of the intake side cam WA1 as a base point.
2) Perform a revolution movement of / 2.

Specifically, the intake side heating coil 110
Perform an exercise as shown in FIG. As shown in FIG. 3 (A), when the outermost end A of the intake side cam WA1 is at a position of 180 °, the center W0 of the intake side cam WA1 is the center of the heating conductor portion 111 of the intake side heating coil 110. It is displaced from 111A by (r1-r2) / 2 in the direction of 0 °.

When the camshaft WA rotates counterclockwise by 90 °, that is, when the outermost end A of the intake cam WA1 is at the position of 270 ° as shown in FIG. 3 (B),
The center W0 of the intake side cam WA1 is the intake side heating coil 11
0 from the center 111A of the heating conductor portion 111 (r1-r
2) It is deviated by 90 in the direction of 90 °.

When the cam shaft WA further rotates counterclockwise by 90 °, that is, when the outermost end A of the intake cam WA1 is at a position of 0 ° as shown in FIG. 3 (C), The center W0 of the intake-side cam WA1 is from the center 111A of the heating conductor portion 111 of the intake-side heating coil 110 (r
1-r2) / 2 is shifted in the direction of 180 °.

Further, when the cam shaft WA further rotates counterclockwise by 90 °, that is, when the outermost end A of the intake cam WA1 is at the position of 90 ° as shown in FIG. 3 (D), The center W0 of the intake-side cam WA1 is displaced from the center 111A of the heating conductor portion 111 of the intake-side heating coil 110 by (r1-r2) / 2 in the direction of 270 °.

That is, the intake side heating coil 110 is
Radius (r1-- around center W0 of intake side cam WA1)
It means that the robot has performed an orbital movement of r2) / 2.

Since the intake side heating coil 110 makes such an orbital motion, the heating conductor portion 11 of the intake side cam WA1.
1 and the outermost end A of the intake-side heating coil 110 are heated to the end B opposite to the position on the extension line of the straight line connecting the center W0 and the outermost end A at all times. Since the distance to the conductor portion 111 is kept substantially equal, the intake side cam WA1
Uniform heating of the peripheral surface is ensured.

Since the exhaust side cam WA2 is similar to the intake side cam WA1, the distance between the outermost end A of the exhaust side cam WA2 and the heating conductor 121 of the exhaust side heating coil 120 is , The distance between the opposite end B and the heating conductor 121 is kept substantially equal, and uniform heating of the peripheral surface of the exhaust side cam WA2 is ensured.

After the predetermined heating is performed, the cooling liquid is jetted from a cooling jacket (not shown) so that both cams WA1 and W1.
Induction hardening is applied to A2.

With such induction hardening, for example, the hardened layer formed on the outermost end portion A of the intake side cam WA1 has substantially the same depth as that formed on other portions. The problems of distortion and quench cracking do not occur.

In the above-described first embodiment, the cam shaft W is driven by the revolution movement of both heating coils 110 and 120.
It was performed by the force from the drive motor that drives the
As shown in FIG. 4, instead of the drive motor, four independent servo motors 259A, 259B, 259C, 259
It is also possible to perform an orbital motion by using D.

In the plural-cam simultaneous quenching apparatus 200 according to the second embodiment, the guide 25 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.
1A, a vertical guide 251B is provided on the side surface of the intake side transformer 230, 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 orbital motion as the orbital motion in the multiple-cam simultaneous quenching device 100 described above is performed.

In this case, the exhaust side heating coil 220
Also has the same two servo motors 259C and 259D, the feed screws 259c and 259d driven by the servo motors 259C and 259D, and the feed screw 259.
It goes without saying that a drive mechanism using guides 252A, 252B, etc. corresponding to c, 259d is provided.

In this way, the servomotors 259A, 259
The drive unit using B, 259C, and 259D relatively easily changes the trajectory of the revolution movement of both heating coils 210 and 220 by changing the control signal for controlling the drive of the servomotors 259A, 259B, 259C, and 259D. It is possible to change. That is, the eccentric cams 155, 1 described above
When the mechanical shaft 56 and the timing belts 159A, 159B, etc. are used and the camshaft W is changed to change the trajectory of the revolution movement, the eccentric cams 155, 1
Since 56 and the like need to be replaced, it takes some time to change them. However, if the control signal is simply changed, it does not require a long time, so that the change can be easily performed.

Further, as the cam shaft, not only the one shown in FIG. 6 but also a cam shaft WB as shown in FIGS. 9 (A) and 9 (B) is available. That is, this camshaft WB
Has a total of four types of cams, two sets of intake side cams WB1 and WB3 and two sets of exhaust side cams WB2 and WB4. The first exhaust side cam WB2 is provided on both sides of the first intake side cam WB1,
The second exhaust side cam WB3 is provided on both sides of the second intake side cam WB3.
4 are arranged respectively. In addition, each intake side cam WB
1 and WB3 from 3 cams respectively, each exhaust side cam W
The camshaft WA is similar to the camshaft WA in that B2 and WB4 each include two cams. The four cams WB1, WB2, WB3, WB4 have different phases.

As shown in FIG. 9C, the plural-cam simultaneous quenching apparatus 300 for induction hardening the four sets of cams WB1, WB2, WB3, WB4 of the camshaft WB is basically the same as described above. 2 multiple cam simultaneous hardening device 100
It will be installed parallel to the table. That is, the camshaft WB includes four sets of cams WB1 and WB2 having different phases,
Since WB3 and WB4 are formed, the camshaft WA is basically the same as the camshaft WA in which the two sets of cams WA1 and WA2 having different phases are formed.

Concretely, the simultaneous hardening apparatus 3 for plural cams is used.
00 is the three first heating cams for the first intake side cam WB1.
In the intake side heating coil 110A, the first intake side transformer 130A heats the second intake side cam WB3.
A second intake side transformer 130B is provided in the two second intake side heating coils 110B, and a first exhaust side is provided in the two first exhaust side heating coils 120A for heating the first exhaust side cam WB2. Transformer 140A for the second exhaust side cam W
Two first exhaust side heating coils 120 for heating B4
The second exhaust side transformer 140B supplies a high frequency current to each B. That is, a high frequency current is supplied from the same transformer to the heating coils that heat the cams of the same phase.

Also in this multi-cam simultaneous quenching apparatus 300, the distance between the center of each cam and the outermost end farthest from the center of each cam is r1, and the position opposite to the position on the extension line of the straight line connecting them. When the distance between the end and the center of the cam is r2, the heating coils 110A, 110B, etc. are
With the center W0 of the center as the center, the radius r is r≈ (r1-r2)
It is the same as that described above in that it is adapted to perform a revolution movement of / 2.

The camshaft is shown in FIG.
There is also a camshaft WC as shown in (A) and (B). That is, the camshaft WC has four types of cams, that is, two sets of intake side cams WC1 and WC3 and two sets of exhaust side cams WC2 and WC4. The first exhaust-side cam WC2 is provided on both sides of the first intake-side cam WC1 and the second intake-side cam WC2.
The second exhaust side cams WC4 are arranged on both sides of 3, respectively. Similar to the camshaft WA, the intake side cams WC1 and WC3 each include three cams, and the exhaust side cams WC2 and WC4 each include two cams. The first exhaust side cam WC2 and the second intake side cam WC3 are in the same phase, and the remaining first intake side cam WC1 and the second exhaust side cam WC4 are in different phases.

That is, in the case of this camshaft WC, there are four types of cams and three types of phases.

An important point in the multi-cam simultaneous hardening apparatus 400 for induction hardening the four sets of cams WC1, WC2, WC3, WC4 of the cam shaft WC thus configured is to heat the cams having the same phase. The high frequency heating coil receives the high frequency current from the same transformer. Therefore, the heating coil 4 for heating the first exhaust side cam WC2
30 and a heating coil 4 for heating the second intake side cam WC3
20 is the first transformer 451 and the heating coil 410 for heating the first intake side cam WC1 is the second transformer 4
From 52, the heating coil 440 for heating the second exhaust side cam WC4 is supplied with the high-frequency current from the third transformer 453, respectively.

The problem here is that in the first exhaust side cam WC2 and the second intake side cam WC3, FIG.
As shown in (A), since the thickness dimension is different, the heat mass is different. That is, when the same induction current is generated in the members having different heat masses by the same high frequency current, a deeper hardened layer is formed due to the smaller heat mass, and a uniform hardened layer cannot be formed on both members.

Therefore, in order to form the same hardened layer on both, the heating coil 430 for heating the first exhaust side cam WC2 and the heating coil 420 for heating the second intake side cam WC3 are the same. I cannot give the high frequency current of. The heating coil 420 that heats the thinner second intake-side cam WC3 must have less current than the heating coil 430 that heats the thicker first exhaust-side cam WC2.

In order to solve this problem, there are the following methods. For example, Inductor to Transformer 4
By interposing between 51 and the heating coil 420 for heating the thinner second intake side cam WC3, the amount of electric power used for heating is reduced. Alternatively, a heating conductor portion of the heating coil 420 for heating the thin second intake side cam WC3,
The gap with the second intake side cam WC3 is increased. Further, the number of coil turns of the heating coil 420 that heats the thin second intake side cam WC3 is reduced. Further, the core is attached to the heating conductor portion of the heating coil 420 that heats the thin second intake-side cam WC3. In addition, it is desirable to appropriately employ these methods according to various conditions.

Further, as shown in FIG. 8, the transformer 800, which constitutes the multiple cam simultaneous quenching device, is hung from above using a rope 820 via a spring 810, and the orbital motion of the transformer, which is a heavy object, As a result, it is also possible to assist the revolution movement of the heating coil. In the drawings, reference numeral 830 denotes a pulley, and the basic configuration of the multiple cam simultaneous quenching device is the same as that of the multiple cam simultaneous quenching device 100 according to the first embodiment. However, this transformer 80
Needless to say, the type in which the revolution movement of the heating coil is assisted by suspending 0 is not limited to the configuration of the multiple cam simultaneous quenching device 100.

Further, in each of the above-described embodiments, the cooling mechanism is the cooling jacket for injecting the cooling liquid, but each heating coil may be provided with an opening and the cooling liquid may be injected from this opening. .

[0052]

The multiple cam simultaneous hardening apparatus according to the present invention is
A plural-cam simultaneous quenching device for simultaneously induction-quenching the circumferential surface of a cam of a camshaft having a plurality of types of cams of different phases, wherein a plurality of circular heating conductors for heating the circumferential surface of the cam are provided. Of the heating coil, a transformer for supplying a current to the heating coil, and a center of the heating conductor of the heating coil and a center of the cam are displaced from each other, and the heating coil is revolved around the cam. The heating coil includes a drive mechanism and a cooling mechanism for cooling the heated cam, and the heating coils having the same phase are configured to be supplied with current from the same transformer.

According to the simultaneous hardening apparatus for plural cams, the outermost end portion, which is the most projecting portion of plural kinds of cams having different phases, can form a hardened layer substantially the same as the other portions. It becomes possible to perform the optimum induction hardening for the cam.

Moreover, the distance between the outermost end of the cam farthest from the center of the cam and the center of the cam is r1, and the end of the cam on the opposite side of the extension of the straight line connecting the two and the center of the cam. When the distance is set to r2, the radius of the revolution of the heating coil is set to r≈ (r1-r2) / 2 centered on the center of the cam, so it is certain that the radius of the plural types of cams with different phases is the most. The outermost end, which is the protruding portion, can be formed with a hardened layer that is substantially the same as the other portions.

Further, the method for simultaneous quenching of plural cams according to the present invention has the same effect as that of the simultaneous quenching apparatus for plural cams.

[Brief description of drawings]

FIG. 1 is an overall schematic configuration diagram of a multi-cam simultaneous quenching device according to a first embodiment of the present invention.

FIG. 2 is a schematic side view of a multi-cam simultaneous quenching device according to the first embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a positional relationship between one heating coil and a cam of the multiple cam simultaneous quenching device according to the first embodiment of the present invention.

FIG. 4 is an explanatory diagram showing a relationship between one of the heating coils and the cam of the simultaneous cam hardening device for multiple cams according to the first embodiment of the present invention.

FIG. 5 is an explanatory diagram showing a main part of one moving mechanism of the multiple-cam simultaneous quenching device according to the first embodiment of the present invention.

FIG. 6 is a schematic view of a cam shaft in which induction hardening is performed on a cam by the multiple-cam simultaneous quenching device according to the first embodiment of the present invention, and FIG. FIG. 1B is a schematic side view.

FIG. 7 is a schematic side view of a multi-cam simultaneous quenching device according to a second embodiment of the present invention.

FIG. 8 is a schematic side view of a multi-cam simultaneous quenching device according to a third embodiment of the present invention.

FIG. 9 is a view of a cam shaft and a multiple cam simultaneous hardening device to which induction hardening of cams is performed by the multiple cam simultaneous hardening device according to another embodiment of the present invention, and FIG. ) Is a schematic front view of the cam shaft, FIG. 8B is a schematic side view of the cam shaft, and FIG.

FIG. 10 is a drawing of a cam shaft and a multiple cam simultaneous hardening device to which induction hardening of cams is performed by the multiple cam simultaneous hardening device according to another embodiment of the present invention. ) Is a schematic front view of the cam shaft, FIG. 8B is a schematic side view of the cam shaft, and FIG.

FIG. 11 is a schematic configuration diagram of a conventional cam quenching device of this type.

[Explanation of symbols]

100 Multiple Cam Simultaneous Quenching Device 110 Intake Side Heating Coil 111 (Intake Side Heating Coil) Heating Conductor 120 Exhaust Side Heating Coil 121 (Exhaust Side Heating Coil) Heating Conductor 130 Intake Side Transformer 140 Exhaust Side Transformer WA Camshaft WA1 Intake side cam WA2 Exhaust side cam W0 Center of intake side cam, exhaust side cam and camshaft

Continuation of the front page (56) Reference JP 2000-87134 (JP, A) JP 10-330833 (JP, A) JP 6-96747 (JP, B2) International Publication 98/35066 (WO, A1) ) (58) Fields investigated (Int.Cl. ⁷ , DB name) C21D 9/00-9/44, 9/50 C21D 1/02-1/84

Claims (2)

(57) [Claims] 1. A plural-cam simultaneous quenching device for simultaneously induction hardening the circumferential surface of a cam of a camshaft having a plurality of types of cams of different phases, wherein a heating conductor portion for heating the circumferential surface of the cam is circular. A plurality of heating coils, a transformer for supplying an electric current to the heating coils, and a center of the heating coil of the heating coil and a center of the cam are displaced from each other, and the heating coil is revolved around the cam. a drive mechanism for the movement, which includes a cooling mechanism for cooling the heated cam, said heating coil, which phase also becomes so that current from the same transformer is supplied
The cam and the outermost end farthest from the center of the cam.
The distance from the center of the frame is r1, the extension of the straight line connecting the two
Let r2 be the distance between the opposite end of the upper position and the center of the cam.
The radius of the orbital motion of the heating coil
A multi-cam simultaneous quenching device characterized by being set to r≈ (r1-r2) / 2 with respect to the center . 2. A plurality of types of cams having different phases are formed.
Multiple cams that simultaneously heat the peripheral surface of the cam of the camshaft
In the simultaneous quenching method, heating to heat the peripheral surface of the cam
Center of heating conductor of multiple heating coils with circular conductor
And the center of the cam are displaced, the heating coil
Revolve around the cam, and have the same phase
The current from the same transformer is applied to the heating coil that heats the cam.
Is supplied from the center of the cam.
The distance between the outermost end and the center of the cam is r1,
End and cam opposite the position on the extension of the straight line connecting the two
When the distance from the center of the heating coil is r2, the revolution of the heating coil
The radius of motion is r ≈ (r1-r
2) Same as multiple cams characterized by being set to / 2
When quenching method .