JP4884195B2 - Cylinder block quenching device and cylinder block manufacturing method - Google Patents

Description

  The present invention relates to a cylinder block quenching apparatus that quenches an inner wall of an opening of a cylinder block, and a cylinder block manufacturing method.

A cylinder block quenching apparatus using high-frequency induction quenching is known.
For example, Patent Document 1 discloses a quenching apparatus that performs high-frequency induction quenching on an inner wall (hereinafter simply referred to as a cylinder inner wall) of an opening of a cylinder block of an internal combustion engine.
The cylinder block quenching device disclosed in Patent Document 1 quenches the inner wall of a cylinder in a spot shape. The cylinder block quenching device disclosed in Patent Document 1 has a function of moving the induction heating coil in the vertical direction and the rotational direction.

In the cylinder block quenching device disclosed in Patent Document 1, the elevator base is lowered, the induction heating coil is inserted into the opening of the cylinder, and a high frequency current is supplied to the induction heating coil to provide a specific height of the cylinder inner wall. Is heated in a broken line shape. Then, after the current supply to the induction heating coil is stopped, it is rapidly cooled, and the inner wall of the cylinder is quenched into spots. Then, the elevator platform is raised and lowered, and the disk on the elevator platform is rotated to slightly rotate the induction heating coil. Thereafter, a high frequency current is again supplied to the induction heating coil to heat a part of the inner wall of the cylinder and rapidly cool it. This operation is repeated to distribute the spot-like hardened portions on the inner wall of the cylinder in a plane and staggered manner.
Japanese Patent Laid-Open No. 9-3531

The conventional cylinder block quenching apparatus can raise and lower the induction heating coil and further rotate it, so that the quenching portions can be distributed in a staggered manner on the inner wall of the cylinder.
By the way, the quenching pattern of the cylinder in the prior art is a distribution in which the spot-like quenching portions are distributed in a plane shape as described above. Invented a spiral quenching pattern.
That is, in the prior art, the quenching pattern on the inner wall of the cylinder is such that the spot-like quenching portions are distributed side by side in the row direction and the column direction, or these are arranged in a staggered manner. It was. On the other hand, the present inventors invented a structure having a quenching pattern in which the quenching portions are spirally continued.
A cylinder with a hardened portion that is spirally formed has a small oil reservoir in the spiral portion, which can strengthen the oil film on the inner wall of the cylinder, and has the effect of preventing cylinder wear and seizure during piston sliding. It was.

However, the existing cylinder block quenching device has been developed for the purpose of distributing the spot-like quenching portions in a planar shape as described above, and it is difficult to realize a spiral quenching pattern. Met.
That is, when a helical quenching pattern is realized using the cylinder block quenching device disclosed in Patent Document 1, the induction heating coil is moved up and down while rotating, and an accurate spiral locus is drawn on the induction heating coil. There must be.
In addition, when moving the induction heating coil, it is necessary to keep the distance between the induction heating coil and the inner wall of the cylinder block constant.

  In contrast, the conventional cylinder block quenching apparatus rotates the induction heating coil together with the transformer, and the transformer has a considerable weight. Therefore, it is difficult to draw an accurate spiral locus on the induction heating coil. Further, in the conventional cylinder block quenching apparatus, the induction heating coil vibrates, and it is difficult to keep the distance between the induction heating coil and the cylinder block inner wall constant during heating. Therefore, it has been difficult to realize a helical quenching pattern with a conventional cylinder block quenching apparatus.

  Accordingly, the present invention focuses on the above-described problems of the prior art, and an object of the present invention is to develop a cylinder block quenching apparatus that can quench the inner wall of the cylinder block in a spiral manner. Another object of the present invention is to provide a method of manufacturing a cylinder block by performing quenching with such a quenching apparatus.

  And invention of Claim 1 for solving an above-mentioned subject is a cylinder block hardening apparatus which hardens the inner wall of the opening of a cylinder block. A 1st contact, a 2nd contact, a conductive member, The first contactor and the second contactor are capable of contacting a specific position of the cylinder block, and the combination of the first contactor, the cylinder block, the second contactor and the conductive member is connected in series to provide a high frequency When a current is applied, the contact position of the first contact and the contact position of the second contact are positions separated in the axial direction and the rotation direction, and a part or all of the conductive member is the first contact and the second contact. A cylinder block quenching apparatus, wherein the quenching apparatus is disposed at a position facing a virtual line connecting the contacts.

In the quenching apparatus for a cylinder block according to the present invention, the first contact and the second contact are brought into contact with the cylinder block. The first contact, the cylinder block, the second contact, and the conductive member are connected in series, and a high-frequency current is applied. Therefore, a current flows through the cylinder block while the first contact and the second contact are in contact. Moreover, in this invention, since the electrically-conductive member is distribute | arranged to the position facing the virtual line which connects a 1st contactor and a 2nd contactor, the current density on the said virtual line is compared with another site | part by the effect | action of a conductive member. It will be expensive. That is, the current does not spread within the cylinder block, but flows linearly (precisely, a spiral curve). As a result, the temperature of the straight line connecting the first contact and the second contact rises and becomes red hot. Further, in the present invention, the contact position of the first contact and the contact position of the second contact are separated in the axial direction and the rotational direction, and therefore, the inner wall of the cylinder glows red on the spiral curve extending in the oblique direction.
In the cylinder block quenching apparatus of the present invention, the first contact and the second contact are brought into contact with the cylinder block, and the surface of the cylinder block is heated by a so-called direct energization method, so that it is not affected by vibration or the like. Spiral quenching can be performed.

  The invention according to claim 2 is characterized in that at least one of the first contactor or the second contactor is plural, and there are plural conductive members, and the plural conductive members are connected in parallel. The cylinder block quenching apparatus according to claim 1.

  In the invention according to claim 3, the number of first contacts and the number of second contacts are the same, each first contact corresponds to a specific second contact, and the corresponding first contact 3. The cylinder block quenching apparatus according to claim 1, wherein a part or all of the conductive member is disposed at a position facing a virtual line connecting the first contact and the second contact.

  In the quenching apparatus of the cylinder block according to claim 2, at least one of the first contactor or the second contactor is plural, and there are plural conductive members, and the plural conductive members are arranged in parallel. Because they are connected, multiple rows can be quenched at once.

  The invention according to claim 4 is the cylinder block hardening apparatus according to any one of claims 1 to 3, wherein a core is attached to a part or all of the conductive member.

  In the cylinder block quenching apparatus of the present invention, since the core is attached to a part or all of the conductive member, the magnetic lines of force generated by the conductive member are concentrated, and the current density of the opposing imaginary line part is further increased.

  The invention according to claim 5 is characterized in that either the cylinder block or the first contactor and the second contactor can be moved in the rotational direction. This is a cylinder block quenching device.

  The invention according to claim 6 uses the cylinder block quenching apparatus according to claim 5 to bring the first contact and the second contact into contact with the opening inner wall of the cylinder block. A high frequency current is applied between the second contacts to heat the cylinder block, and after the supply of electricity is stopped, the heated part of the cylinder block is cooled, and either the cylinder block or the first contact and the second contact are It is a manufacturing method of a cylinder block which rotates and changes the contact position of a 1st contactor and a 2nd contactor, and heats and cools a cylinder block again.

  In the cylinder block manufacturing method of the present invention, the entire surface of the cylinder inner wall can be quenched in a spiral manner.

According to the cylinder block quenching apparatus of the present invention, it is possible to quench the opening inner wall of the cylinder block in a spiral shape.
According to the present invention, an intermittent oil film (oil reservoir) is formed in the axial direction of the inner wall of the opening, and a cylinder block having excellent lubricity, prevention of seizure when the piston slides, and excellent wear resistance can be realized. .

Embodiments of the present invention will be further described below.
FIG. 1 is a schematic perspective view conceptually showing a cylinder block quenching apparatus according to an embodiment of the present invention. FIG. 2 is a perspective view that actually describes the cylinder block quenching apparatus according to the embodiment of the present invention. FIG. 3 is a front view illustrating the cylinder block quenching apparatus of FIG. 2 in a developed manner. 4 is a cross-sectional perspective view of the cylinder block quenching apparatus of FIG. 5 is a cross-sectional view taken along the line VV in FIG.

The cylinder block quenching apparatus 1 according to the embodiment of the present invention heats the inner wall of a cylinder by a direct energization method and performs quenching.
Accordingly, the cylinder block quenching apparatus 1 includes first contacts 4a and 4b and second contacts 9a and 9b for energizing the inner wall 71 of the cylinder.
In addition, conductive members 12a and 12b and power supply lines 13 and 14 for supplying power to these from the transformer 6 are provided.

In the cylinder block quenching apparatus 1 of the present embodiment, feed lines 13 and 14 are connected to two output terminals (not shown) of the transformer 6, respectively. The feeder lines 13 and 14 are branched into two on the way as shown in FIG. One power supply line 13 is connected to the first contacts 4a and 4b at each branch.
The other branched feeder 14 is connected to the first contacts 5a and 5b via the conductive members 12a and 12b, respectively. In the conductive members 12a and 12b in the present embodiment, the core 34 is provided on the surface that does not face the inner wall 71 of the cylinder (cylinder block) as shown in FIG. The core 34 is made of a magnetic material such as ferrite.
The combination of the first contact 4a, the inner wall 71 of the cylinder, the second contact 9a and the conductive member 12a constitutes a series circuit.
Similarly, the combination of the first contact 4b, the inner wall 71 of the cylinder, the second contact 9b, and the conductive member 12b is also a series circuit.
However, on the basis of the transformer 6, the two sets of DC circuits described above are in parallel.

When the positional relationship of each member is seen, the first contact 4 and the second contact 9 constituting each DC circuit are in contact with the inner wall 71 of the cylinder at positions separated in the axial direction and the rotational direction. More specifically, the first contact 4a and the second contact 9a constituting one of the DC circuits are located away from each other both in the axial direction and in the rotational direction, and the virtual line 15a connecting them is inclined. is doing. More precisely, the virtual line 15a is a spiral.
Similarly, the first contact 4b and the second contact 9b constituting the other DC circuit are located at positions separated from each other in both the axial direction and the rotational direction, and the virtual line 15b connecting them is inclined and spiraled. Is.

  Further, the conductive members 12a and 12b are at positions facing the virtual lines 15a and 15b as shown in FIGS. That is, the distance between the conductive members 12a and 12b and the inner wall 71 of the cylinder is the same in any part, and the conductive members 12a and 12b are on a plane including the virtual lines 15a and 15b and the central axis of the cylinder bore.

  Further, the cylinder block quenching apparatus 1 according to the embodiment of the present invention includes a cooling jacket 16 beside the first contacts 4a, 4b and the like. Cooling liquid is supplied to the cooling jacket 16, and the cooling liquid can be ejected from the opening 26 (that is, the nozzle 26 shown in FIG. 4) provided on the side surface toward the inner wall 71 of the cylinder.

When using the cylinder block quenching apparatus 1 of the present embodiment, power is supplied to the transformer 6 and a high-frequency current is generated on the secondary side of the transformer 6. This high-frequency current flows to the inner wall of the cylinder via the first contacts 4a and 4b and the second contacts 9a and 9b.
In the present embodiment, the conductive members 12a and 12b are opposed to the virtual lines 15a and 15b connecting the first contacts 4a and 4b and the second contacts 9a and 9b, and the conductive members 12a and 12b are energized. Is done. Therefore, on the inner wall 71 side, the current density on the virtual lines 15a and 15b is higher than that of other parts. That is, the current does not spread within the cylinder block, but flows along a spiral curve.
Further, a magnetic field is generated by the high-frequency current flowing through the conductive members 12a and 12b, and an induced current is generated on the virtual lines 15a and 15b on the inner wall 71 of the cylinder.
As a result, the portion of the inner wall 71 of the cylinder on the spiral curve connecting the first contacts 4a, 4b and the second contacts 9a, 9b is heated and red hot.

Thereafter, the power supply to the transformer 6 is stopped, and the coolant is jetted from the cooling jacket 16 toward the inner wall 71 of the cylinder to quench the red-hot portion.
As a result, two pieces of quenching are performed on the inner wall 71 of the cylinder.
Thereafter, the contact positions of the first contactors 4a and 4b and the second contactors 9a and 9b are rotated by a predetermined angle, and the same process as before is repeated.

  As a result, as shown in FIGS. 6 and 7, the entire surface of the inner wall 71 of the cylinder can be helically quenched. The inner wall 71 has a layered portion that is hardened and hardened and an unhardened portion that is not hardened, and an oil pool is formed in the unhardened portion. As a result, the inner wall 71 has good lubricity when a piston (not shown) slides. As a result, it can prevent seizure and further improve wear resistance. FIG. 6 is a cutaway perspective view of the inner wall 71 of the cylinder quenched by the cylinder block quenching apparatus of FIG. FIG. 7 is a development view of the inner wall 71 of the cylinder.

  As above, the schematic configuration of the cylinder block quenching apparatus 1 according to the present embodiment has been conceptually described. However, when actually designing the cylinder block quenching apparatus 1, the insulation of each part and the reaction force are ensured. Ingenuity is necessary. FIG. 8 is a perspective view showing another embodiment of the cylinder block quenching apparatus 17 of the present invention. 9 is a cross-sectional perspective view of a conductive member employed in the cylinder block quenching apparatus shown in FIG.

The cylinder block quenching device 17 of this embodiment has two sets of quenching blocks 18 and 19, and small cylinders 28 and 29 (for example, air cylinders) are provided between the quenching blocks 18 and 19. It is a thing.
The quenching blocks 18 and 19 employed in this embodiment each have the members and circuit configuration shown in FIG.
That is, the quenching blocks 18 and 19 include first contacts 4a and 4b and second contacts 9a and 9b for energizing the inner wall 71 of the cylinder, respectively.
In addition, conductive members 12a and 12b and power supply lines 13 and 14 for supplying power to these from a transformer (not shown) are provided. In the conductive members 12a and 12b in the present embodiment, the core 34 is provided on the surface that does not face the inner wall 71 of the cylinder as shown in FIG. The core 34 is made of a magnetic material such as ferrite. Further, the outer periphery of the core 34 is covered with an insulator 24.

The combination of the first contact 4, the cylinder inner wall 71, the second contact 9 and the conductive member 12 constitutes a series circuit.
Further, the first contactor 4 and the second contactor 9 constituting each DC circuit are in contact with the inner wall 71 of the cylinder at positions distant from each other in the axial direction and the rotational direction, and the first contactor constituting the DC circuit. 4 and the second contactor 9 are at positions separated from each other in the axial direction and the rotational direction, and the imaginary line 15 connecting them is inclined.
The conductive member 12 is at a position facing the virtual line 15.

  In the cylinder block quenching apparatus 17 of the present embodiment, the quenching blocks 18 and 19 are inserted into the openings of the cylinders while the small cylinders 28 and 29 are contracted. Then, the small cylinders 28 and 29 are extended with the quenching blocks 18 and 19 inserted. As a result, the quenching blocks 18 and 19 are separated from each other. As a result, the contacts 3 and 5 are pressed against the inner wall 71 of the cylinder by the quenching blocks 18 and 19.

In this state, a high-frequency current is passed between the first contact 4 and the second contact 9, and the spiral curve connecting the first contact 4 and the second contact 9 is heated.
Thereafter, the coolant is sprayed from the nozzle 37 to the opening of the cylinder block to cool the red hot part. Here, the nozzle 37 is connected to a cooling tank (not shown) so that the coolant in the cooling tank can be ejected.

  In the above embodiment, the example which injects a cooling liquid from the opening 26 (nozzle) of the cooling jacket 16 (FIG. 4) as a cooling device, and the example which injects the cooling liquid in the cooling tank which is not shown from the nozzle 37 were shown. However, the cooling device is not limited to these configurations, and it is also conceivable to arrange the cylinder block in the cooling tank containing the cooling liquid. That is, the cylinder block after baking is immersed in a coolant in a cooling tank (not shown), or the liquid level of the cooling liquid in the cooling tank can be controlled up and down by a pump or the like, and the cylinder block is placed in the cooling tank. It is also possible to cool the cylinder block by immersing it in the cooling liquid by raising the liquid level in the cooling tank after the baking process.

Thereafter, the small cylinders 28 and 29 are contracted, and the geared motor 38 is rotated to rotate the quenching blocks 18 and 19.
Thereafter, the small cylinders 28 and 29 are extended to press the respective contacts 3 and 5 against the inner wall of the cylinder block, and quenching is performed in the same process as before.

  In the embodiment described above, the configuration in which the quenching blocks 18 and 19 are separated or approached by the small cylinders 28 and 29 is adopted, but the same operation can be performed using the link mechanism. .

  FIG. 10 is a front view showing still another embodiment of the quenching apparatus for a cylinder block according to the present invention, and shows a state in which the quenching blocks 18 and 19 are close to each other. FIG. 11 is a front view of the cylinder block quenching apparatus shown in FIG. 10 and shows a state where the quenching blocks 18 and 19 are separated from each other.

  In the cylinder block quenching apparatus 32 according to the present embodiment, the quenching blocks 18 and 19 constitute a part of the four-joint rotation chain mechanism, and the central sliding member 39 is lowered as shown in FIGS. 10 to 11. The quenching blocks 18 and 19 are separated from each other, and the quenching blocks 18 and 19 come into contact with the inner wall 71 of the cylinder.

1 is a schematic perspective view conceptually showing a cylinder block quenching apparatus according to an embodiment of the present invention. It is the perspective view which described substantially the hardening apparatus of the cylinder block of embodiment of this invention. It is the front view which developed the hardening apparatus of the cylinder block of FIG. It is a cross-sectional perspective view of the hardening apparatus of the cylinder block of FIG. It is VV sectional drawing of FIG. FIG. 2 is a cutaway perspective view of an inner wall of a cylinder quenched by the cylinder block quenching apparatus of FIG. 1. It is an expanded view of the inner wall of a cylinder. It is a perspective view which shows other embodiment of the hardening apparatus of the cylinder block of this invention. It is a cross-sectional perspective view of the electrically-conductive member employ | adopted with the hardening apparatus of the cylinder block shown in FIG. It is a front view which shows other embodiment of the quenching apparatus of the cylinder block of this invention, and shows the state which the quenching blocks approached. It is a front view of the quenching apparatus of the cylinder block shown in FIG. 10, and shows the state which the quenching blocks separated.

Explanation of symbols

1, 17, 32 Cylinder block quenching device 4a, 4b First contact 6 Transformer 9a, 9b First contact 12a, 12b Conductive member 13, 14 Feed line 15a, 15b Virtual line 16 Cooling jacket 18, 19 Quenching Block 24 Insulator 26 Opening (nozzle) for injecting coolant from cooling jacket
28, 29 Small air cylinder 34 Core 37 Nozzle 71 for injecting cooling liquid Inner wall of cylinder

Claims (6)

  A quenching apparatus for a cylinder block that quenches an inner wall of an opening of a cylinder block, comprising: a first contact, a second contact, and a conductive member, wherein the first contact and the second contact are specific cylinder block The first contactor, the cylinder block, the second contactor, and the conductive member are connected in series, and a high frequency current is passed through the first contactor, the cylinder block, the second contactor, and the second contactor. The contact position is a position separated in the axial direction and the rotation direction, and a part or all of the conductive member is arranged at a position facing a virtual line connecting the first contact and the second contact. Cylinder block quenching equipment.   2. The cylinder according to claim 1, wherein at least one of the first contactor and the second contactor is plural, and there are plural conductive members, and the plural conductive members are connected in parallel. Block quenching equipment.   The number of first contacts is the same as the number of second contacts, and each first contact corresponds to a specific second contact, and a virtual line connecting the corresponding first contact and the second contact 3. The cylinder block hardening apparatus according to claim 1, wherein a part or the whole of the conductive member is disposed at a position facing each other. 4.   The cylinder block hardening apparatus according to any one of claims 1 to 3, wherein a core is attached to a part or all of the conductive member.   The cylinder block quenching device according to any one of claims 1 to 4, wherein the cylinder block or any one of the first contact and the second contact is movable in the rotation direction.   The cylinder block quenching apparatus according to claim 5 is used, the first contact and the second contact are brought into contact with the inner wall of the opening of the cylinder block, and a high frequency current is applied between the first contact and the second contact. Energize to heat the cylinder block, stop energization, cool the heated part of the cylinder block, rotate the cylinder block, or the first contactor and the second contactor, and rotate the first contactor and the second contactor A method of manufacturing a cylinder block, wherein the contact position of the contact is changed and the cylinder block is heated and cooled again.

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