JPH0554535U - Inner quenching device for constant velocity joints - Google Patents

Abstract

(57) [Summary] [Purpose] In induction hardening of the inner surface 51 of a constant velocity joint, sufficient cooling liquid L is supplied to the inner surface 51 to prevent occurrence of incomplete hardening. [Structure] In an inner surface quenching device of a constant velocity joint 50 placed around an opening 43 of a horizontal work placing plate 40, a heating coil 10 for heating an inner surface 51 of the constant velocity joint 50, and a heating coil 10. And a cooling liquid injection port 31 provided at the tip of the cooling liquid injection port 31.
An insulator 16 that seals the heating coil 10 and the cooling liquid jet pipe 30 with the cooling liquid jet port 31 left, and is formed so as to correspond to the shape of the inner surface 51 of the constant velocity joint 50; Heating coil body 100 having a lid 15 provided in contact with the lower end of
When the heating coil body 100 is inserted into the constant velocity joint 50, the lid 15 covers the lower part of the opening 43 and the work mounting plate 40 around the opening 43 and mounts the work. Plate 40
The distance G between the cover 15 and the lid 15 is selected so that the cooling liquid L injected from the cooling liquid injection port 31 into the constant velocity joint 50 is filled between the inner surface 51 of the constant velocity joint 50 and the insulator 16. Has been done.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to an inner surface quenching device for a constant velocity joint used in a traveling system of an automobile or the like.

[0002]

[Prior Art]

 Hereinafter, a conventional technique will be described with reference to the drawings. 5 and 6 are perspective views of a first example and a second example of a high frequency heating coil (hereinafter simply referred to as a heating coil) and a cooling liquid injection pipe used in a conventional inner surface quenching device of a constant velocity joint. .

A constant velocity joint used in a traveling system of an automobile or the like requires quenching on a transfer surface formed on the inner surface of a constant velocity joint because of its function. For this quenching, the heating coil 10 and the coolant injection pipe 30 shown in FIG. 5 are used.

The heating coil 10 of the first example, which is inserted into the constant velocity joint to heat the transfer surface, includes a pair of power supply conductors 12 and a spiral heating conductor having both ends connected to the power supply conductors 12. It has 11 and. The cooling liquid injection pipe 30 is vertically arranged so as to penetrate the central portion of the heating conductor 11, and has a cooling liquid injection port 31 at its tip.

The heating coil 10 and the cooling liquid injection pipe 30 are integrally inserted into the constant velocity joint, and after a high frequency current is applied to the heating coil 10 for a predetermined time, the cooling liquid injection pipe 30 is cooled. When the cooling liquid is injected from the liquid injection port 31, the injected cooling liquid cools the inner surface of the constant velocity joint and quenches the transfer surface.

The heating coil 20 of the second example is a heating coil used when quenching the inner surface of a so-called tripod type constant velocity joint, and heats the pair of power supply conductors 24 and the transfer surface 6 It is provided with one vertical heating conductor 21, three horizontal connecting conductors 22 which connect these heating conductors 21 in series one after another, and two horizontal connecting conductors 23. This heating coil 20 can also be inserted inside the constant velocity joint integrally with the cooling liquid injection pipe 30 to form a hardened layer on the transfer surface.

[0007]

[Problems to be solved by the device]

 However, when quenching the inner surface of a constant velocity joint using such a heating coil and a cooling liquid injection pipe, there were the following problems. That is, since there is a gap between the adjacent conductors of the heating coil and a gap between the heating coil and the coolant injection pipe, a considerable part of the coolant injected from the coolant injection port However, it was not possible to supply sufficient cooling liquid to the heated inner surface of the constant velocity joint because it entered the gap. As a result, it was difficult to completely quench the inner surface of the constant velocity joint.

The present invention has been made in view of the above circumstances, and in induction hardening of the inner surface of a constant velocity joint, supplies sufficient cooling liquid to the inner surface to prevent the occurrence of incomplete hardening. It is an object of the present invention to provide an inner surface quenching device for a constant velocity joint that can be used.

[0009]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the inner surface quenching device of the present invention is an inner surface quenching device for a constant velocity joint placed around an opening of a horizontal work mounting plate. A high-frequency heating coil that is inserted inside to heat the inner surface of the constant velocity joint, a cooling liquid injection pipe that is arranged almost vertically at the center of the high-frequency heating coil, and a cooling liquid injection pipe are provided at the tip of the cooling liquid injection pipe. A cooling liquid injection port; an insulator formed to seal the high frequency heating coil and the cooling liquid injection pipe while leaving the cooling liquid injection port and to correspond to the inner surface shape of the constant velocity joint; A heating coil body having a lid provided in contact with the lower end of the object, and the lid has the opening and the periphery of the opening when the heating coil body is inserted into the constant velocity joint. Covers the lower side of the workpiece mounting plate and The distance between the plate and the lid is selected so that the cooling liquid injected from the cooling liquid injection port into the constant velocity joint is filled between the inner surface of the constant velocity joint and the insulator. There is.

[0010]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are drawings for explaining a first embodiment, FIG. 1 is a vertical cross-sectional explanatory view, and FIG. 2 is a perspective view of a heating coil body. FIG. 3 is a perspective view of the heating coil body of the second embodiment, and FIG. 4 is a vertical cross-sectional explanatory view of the third embodiment. In addition, the same components as those described in the related art will be described with the same reference numerals.

The inner surface quenching device of the constant velocity joint of the first embodiment is a device for quenching the inner surface 51 of the constant velocity joint 50 shown in FIG. As shown in FIG. 5, in addition to the heating coil 10 and the cooling liquid injection pipe 30 described in FIG. 5, a heating coil body 100 having a lid 15 and an insulator 16 is provided. The power supply conductor 12 of the heating coil 10 and the cooling liquid injection pipe 30 are fixed to the lid 15 so as to penetrate therethrough. The insulator 16 seals the heating coil 10 and the cooling liquid jet pipe 30 except for the cooling liquid jet port 31, and the lower part is in close contact with the upper surface of the lid 15.

The insulator 16 is provided between the conductors of the heating coil 10, the space between the heating coil 10 and the cooling liquid injection pipe 30, the space between the lid 15 and the heating coil 10, and the lid 15 and the cooling. Insert a large number of small pieces of glass laminate, for example, in the space between the liquid injection pipe 30 and bond these small pieces with, for example, Araldite, and make the surface of the insulator 16 the shape of the inner surface 51 of the constant velocity joint 50. The small pieces are arranged so as to have a corresponding shape, and the surface of the insulator 16 facing the inner surface 51 is uniformly coated with araldite.

In FIG. 1, reference numeral 40 denotes a horizontally placed metal work placing plate, and the diameter of a circular opening 43 provided in the work placing plate 40 is equal to that of the opening 43. Therefore, the diameter of the insulator 16 is made larger so that the part of the heating coil body 100 excluding the lid 15 can be inserted into the constant velocity joint 50. Around the opening 43, several insulating spacers 41 on which the lower end of the constant velocity joint 50 is placed are attached. The work mounting plate 40 functions as a concentrator when heating the constant velocity joint 50 (that is, a function of preventing overheating of the lower end portion of the constant velocity joint 50).

Since the diameter of the lid 15 is selected to be larger than the diameter of the opening 43, when the heating coil body 100 is inserted into the constant velocity joint 50 and comes close to the inner surface 51, the lid 15 is closed. So as to cover the lower part of the opening 43 and the work placing plate 40 around the opening 43, and to obtain a predetermined gap G between the lower surface of the work placing plate 40 and the upper surface of the lid 15. The position of the lid 15 with respect to the heating coil 10 is set.

Next, the operation of the first embodiment will be described. First, after placing the constant velocity joint 50 on the spacer 41 of the work placing plate 40, the heating coil body 100 is inserted into the constant velocity joint 50 through the opening 43 of the work placing plate 40. Then, a high frequency current is applied to the heating coil 10 through the power supply conductor 12 for a predetermined time. After this, the cooling liquid L is injected into the constant velocity joint 50 from the cooling liquid injection port 31 at the tip of the cooling liquid injection pipe 30.

The jetted cooling liquid L flows in the direction of the arrow without reference numeral and falls out of the quenching apparatus. That is, the sprayed cooling liquid L flows between the insulator 16 of the heating coil body 100 and the inner surface 51 of the constant velocity joint 50 to cool the inner surface 51, and then the opening 43 and the insulator 16 are separated from each other. And falls between the lower surface of the work placing plate 40 and the upper surface of the lid 15. At this time, the distance G is selected in advance so that the injected cooling liquid L fills the space between the inner surface 51 of the constant velocity joint 50 and the insulator 16 of the heating coil body 100. The inner surface of the quick joint 50 is uniformly and sufficiently cooled.

Next, a second embodiment will be described. As shown in FIG. 3, the heating coil body 200 of the quenching apparatus according to this embodiment includes, in addition to the heating coil 20 and the cooling liquid injection pipe 30 described in FIG. 6, the lid 15 and the insulating material of the first embodiment. It has a lid 25 and an insulator 26 similar to 16 respectively. Therefore, also in the quenching apparatus of the second embodiment, the heating coil body 200 is inserted into the inside of the report type constant velocity joint, and the three pairs of heating conductors 21 are arranged so as to face the rolling contact surface. By heating the rolling contact surface by means of heating, the same effect as that of the quenching device of the first embodiment can be obtained.

In the above-described embodiment, the constant velocity joint has the shaft 52 and the upper portion of the inner surface 51 is closed. However, as in the constant velocity joint 50A shown in FIG. There is a cylindrical one whose part is open. When quenching the inner surface 51 of such a constant velocity joint 50A, as shown in the figure, while holding the upper end of the constant velocity joint 50A with a holding jig 60 having a substantially umbrella shape, Similarly, the inner surface 51 can be hardened.

[0019]

[Effect of the device]

 As described above, the inner surface quenching device for a constant velocity joint of the present invention is an inner surface quenching device for a constant velocity joint that is placed around the opening of a horizontal work mounting plate. A high-frequency heating coil that is inserted into the high-velocity joint to heat the inner surface of the constant-velocity joint, a cooling liquid injection pipe that is arranged almost vertically in the center of the high-frequency heating coil, and a cooling liquid injection pipe A cooling liquid injection port provided at the tip and an insulation formed to seal the high frequency heating coil and the cooling liquid injection pipe while leaving the cooling liquid injection port and to correspond to the inner surface shape of the constant velocity joint. A heating coil body having an object and a lid provided in contact with a lower end of the insulator, and the lid is provided with the heating coil body when the heating coil body is inserted into a constant velocity joint. Below the holes and the workpiece mounting plate around the holes The distance between the cover and the work placement plate and the lid is selected so that the cooling liquid injected from the cooling liquid injection port into the constant velocity joint is filled between the inner surface of the constant velocity joint and the insulator. ing.

Therefore, when the inner surface of the constant velocity joint of the present invention is quenched, the heated inner surface is completely cooled to prevent the occurrence of incomplete quenching. Can be formed.

[Brief description of drawings]

FIG. 1 is a vertical cross sectional view of a first embodiment of the present invention.

FIG. 2 is a perspective view of a heating coil body according to a first embodiment of the present invention.

FIG. 3 is a perspective view of a heating coil body according to a second embodiment of the present invention.

FIG. 4 is a vertical cross-sectional explanatory view of the third embodiment of the present invention.

FIG. 5 is a perspective view of a heating coil and a coolant injection pipe of a first example used in a conventional inner surface quenching device of a constant velocity joint.

FIG. 6 is a perspective view of a heating coil and a coolant injection pipe of a second example used in a conventional inner surface quenching device for a constant velocity joint.

[Explanation of symbols]

 10, 20 Heating coil 15, 25 Lid 16, 26 Insulator 30 Coolant injection pipe 31 Coolant injection port 40 Work placement plate 43 Opening hole 50 Constant velocity joint 51 Inner surface G spacing L Coolant

Claims (1)

[Scope of utility model registration request] 1. An inner surface quenching device for a constant velocity joint placed around an opening of a horizontal work placement plate, wherein the inner surface of the constant velocity joint is heated by being inserted into the constant velocity joint through the opening. A high-frequency heating coil, a cooling liquid injection pipe arranged substantially vertically in the center of the high-frequency heating coil, and a cooling liquid injection port provided at the tip of the cooling liquid injection pipe,
An insulator formed to seal the high-frequency heating coil and the coolant injection pipe leaving the coolant injection port and to correspond to the inner surface shape of the constant velocity joint, and to contact the lower end of the insulator. A heating coil body having a lid provided,
Moreover, the lid covers the lower side of the opening and the work placing plate around the opening when the heating coil body is inserted into the constant velocity joint, and the distance between the work placing plate and the lid. Is selected such that the cooling liquid injected from the cooling liquid injection port into the constant velocity joint is filled between the inner surface of the constant velocity joint and the insulator. Inner quenching device.