JPH0241157Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a tempered coil body using high-frequency current, and is particularly applicable to the pinion shaft of rack-and-pinion power steering for automobiles.
The present invention relates to a coil body that undergoes high-frequency partial tempering after carburizing and quenching.

(Prior Art) Conventionally, as this type of induction tempered coil body, the one shown in FIG. 3 is known. This conventional coil body 30 is made up of two sets of round coils 31 and 32 spaced apart on a coaxial line x corresponding to the outer diameter of a pinion shaft 10 of an automotive rack-and-pinion power steering system. It is configured. That is, one turn of the round coil 31
is provided corresponding to the manual stopper portion 11 on the handle side of the pinion shaft 10, and the two-turn round coils 33 and 34 are provided on the rack rod corresponding to the opposite side in the axial direction of the large diameter portion 12 in the middle of the pinion shaft. These two sets of round coils 31 and 32 are provided corresponding to the side bearing receiving part 13 and the threaded part 15, respectively, and these two sets of round coils 31 and 32 are arranged in a direction perpendicular to the axis x, as shown by arrow A. When the pinion shaft 10 is carried in and shifted in the axial direction, the pinion shaft 10 is fixedly installed at intervals so as to be set in each set of round coils 31 and 32. In addition, 31 of each set of coils,
Output transformers 35 and 36 are connected to 32, and high frequency current is supplied separately in two stages from one high frequency oscillator 37 via a changeover switch 38, and tempering is performed with air cooling. ing. The coils 31, 33, and 34 are made of square copper pipes, into which cooling water is introduced.
Cooling water is injected toward the pinion shaft 10 from a through hole (not shown) bored in a side wall facing the pinion shaft 10.

(Problem to be solved by the invention) However, since the conventional high-frequency tempered coil body 30 having the above configuration is a round multi-coil, the pinion shaft 1
0, heating is carried out continuously and the surface temperature reaches the transformation point AC ₁ or higher, which results in re-hardening due to the mass effect.For this reason, heating is interrupted once during heating and then restarted after a certain period of time. In addition to being forced to perform so-called two-stage heating, it is also necessary to take a long time for air cooling, which increases the working time. In addition, it is necessary to set conditions and provide a cooling water system for each of the two sets of coils 31 and 32, which impedes efficient use of the equipment, and also arranges the two sets of coils 31 and 32 on the coaxial line x. In order to do this, the precision of coil manufacturing must be carefully controlled, which increases costs.

Manual stopper part 11 and bearing receiving part 1
Even if the coils corresponding to No. 3 are combined into a single coil and integrated into a set, an inconvenience occurs because the intermediate large diameter portion, which should not be tempered, is also heated.

The present invention was developed in view of the problems of the prior art described above, and allows cooling time to be taken while the pinion shaft of the workpiece is rotating, thereby preventing the surface from being overheated. There is no need for heating and the air cooling time is short, so the work cycle can be shortened, and at least two or more locations on the pinion shaft can be tempered and heated at the same time.
Another object of the present invention is to provide an induction tempered coil body that allows efficient use of equipment.

(Means for Solving the Problems) The high-frequency tempered coil body of the present invention that achieves the above object will be explained with reference to drawings corresponding to embodiments. Fig. 1 shows the configuration of one line of the high-frequency tempered coil body. The explanatory diagram shown in FIG. 2 is a front view showing the relationship between the high-frequency tempered coil body and the pinion shaft.

1 and 2, the high-frequency tempered coil body 1 is attached to a pinion shaft 10 of an automotive rack-and-pinion power steering system.
is subjected to high-frequency partial tempering after carburizing and quenching, and the manual stopper portion 11 on the handle side sandwiching the large diameter portion 12 at the middle portion of the pinion shaft 10.
(forms a kind of clutch and is tempered to improve impact resistance) and the bearing receiving part 13 on the rack rod side.
(tempered to form holes in a later process) and threaded part (tempered to improve impact resistance under the screw neck) 15 with a semi-open inner diameter smaller than the outer diameter of the large diameter part 12. The type coils 4, 5, 7 are provided in close proximity to each other, and these coils 4, 5, 7
are formed in one line using square copper pipes, and the semi-open coils 4, 5, and 7 are connected to the window 4.
A, 5a, 7a are formed by a pair of coils 4b, 4c, 5b, 5c, 7b, 7c arranged oppositely, and the connecting portions 3a, 3b, 6a, 6b are parallel to each other from the pinion shaft 10. The coils 4b, 4c, 5b, 5c, 7b, and 7c are connected at right angles to the center of one of the coils 4b, 4c, 5b, 5c, 7b, and 7c.

To explain the present high-frequency tempered coil body 1 in more detail, a pair of terminal portions 2 and 8 at approximately the center of the high-frequency tempered coil body 1 are provided with pipe joints 2a and 8a, respectively, for supplying and discharging cooling water. A semi-circular semi-open coil 4 corresponding to the manual stopper part 11 is connected to the manual stopper part 11 via a connecting part 3a provided in the longitudinal direction parallel to the axis x of the pinion shaft 10 and at a sufficient distance.
is connected to. The semicircular coil 4 has a window 4a
A connecting portion 3b, which is made up of a pair of coils 4b and 4c arranged opposite to each other with a
It is connected to a U-shaped semi-open coil 5 that corresponds to the bearing receiving part 13 at the center via. The U-shaped coil 5 has a thick bearing receiving part 1
It consists of a pair of U-shaped coils 5b and 5c, each having a relatively large window 5a and a larger heating capacity than a semicircular one, so as to sufficiently heat the connecting part 3.
It is connected to a 1/4 circular semi-open coil 7 corresponding to the threaded part 15 via a connecting part 6a provided on the vertical extension of a. The 1/4 circular coil 7 is composed of a pair of 1/4 circular coils 7b and 7c, each having a small window 7a and a small heating capacity so as not to overheat the threaded portion 15, which has a small heated portion. The connecting portion 6 is arranged in parallel with the connecting portion 6a.
It is connected to the terminal portion 8 via b.

Between each pair of terminal parts 2 and 8 and connecting part 3a,
An insulating plate 9 such as a Teflon plate is interposed between 3b and 6a, 6b to ensure electrical insulation.

Further, in order to stably fix the coil body 1, a plurality of fixing screws S are provided at appropriate pitches.

(Function) The function of the high-frequency tempered coil body 1 having the above configuration is as follows.
Because it has a semi-open shape, even if the pinion shaft 10 of the workpiece has a large-diameter portion 12 with an outer diameter larger than the coil inner diameter in the middle, it can be easily removed from the direction perpendicular to the coil axis x. The coils 4, 5, 7 corresponding to the completely tempered parts can be installed close to each other, and each coil 4, 5, 7 can be connected to the pinion shaft 10.
Since it is constructed of one line that is installed close to each tempered part of the pinion shaft 10, the connecting parts of each coil are sufficiently spaced apart, and the parts of the pinion shaft 10 that do not need to be tempered are not heated, and additional heat is kept to a minimum. It becomes possible to temper with the minimum work cycle in the equipment. Furthermore, the windows 4a, 5a, 7 of each set of coils 4, 5, 7
A pair of coils 4 of the same shape installed oppositely across a.
The current directions at b, 4c, 5b, 5c, 7b, and 7c are reversed, making it possible to reduce the additional inductance.

Further, by forming each coil 4, 5, 7 in a shape corresponding to the heat capacity of the tempered portions 11, 13, 15 of the pinion shaft 10, uniform tempering is possible.

(Example) An embodiment of the present invention will be described below.

In the high frequency tempered coil body 1 fixed horizontally,
A high frequency current is supplied from a conventional vacuum tube oscillation type high frequency oscillator via an output transformer under the following conditions.

Anode voltage: 9.6KV Anode current: 3.85~4.0A Grid current: 0.31~0.3A After carburizing and quenching, the pinion shaft 10 of the workpiece is set to be rotatably driven at a distance of approximately 4 mm from the bottom of the coil body 1. , the manual stopper part 11, the bearing receiving part 13, and the screw part 15 are heated by high frequency induction to about 650° C. for 17 seconds at a rotation speed of 120 rpm. After heating, it was air-cooled for 6 seconds, and then cooling water was sprayed from a separate cooler for 5 seconds to lower the temperature to a safe temperature for work, thereby achieving the desired effect.

(Effects of the invention) As described above, according to the high-frequency tempered coil body 1 of the invention, the coils 4, 5, and 7 that are placed close to each other in correspondence with the respective tempering points 11, 13, and 15 of the pinion shaft 10 of the workpiece are A pair of coils 4b of the same shape are arranged opposite to each other with windows 4a, 5a, 7a in between,
4c, 5b, 5c, 7b, 7c, each tempering location 11, 1 has two or more locations.
3 and 15 at the same time, each tempering location 1 of the pinion shaft 10 of the workpiece can be heated at the same time.
1, 13, and 15 in two stages, productivity is greatly improved, and the manufacturing cost of the coil can be reduced. Since it is placed sufficiently far away from and in parallel with the steel, it does not exert an inducing effect on areas that should not be tempered.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the one-line configuration of the inventive high-frequency tempered coil body, FIG. 2 is a front view showing the relationship between the high-frequency tempered coil body of the same configuration and the pinion shaft, and FIG. 3 is a conventional FIG. 3 is an explanatory diagram showing the relationship between a round high-frequency tempered coil body and a pinion shaft. Explanation of symbols, 1... High-frequency tempered coil body, 3
a, 3b, 6a, 6b...connection part, 4, 5, 7...
...Semi-open coil, 4a, 5a, 7a...Window, 4
b, 4c, 5b, 5c, 7b, 7c... Opposite coil, 10... Pinion shaft, 11, 13, 15...
Tempered small diameter part, 12... large diameter part.

Claims (1)

[Scope of utility model registration request] The pinion shaft 10 of an automotive rack-and-pinion power steering system is subjected to high-frequency partial tempering after carburizing and quenching, and the tempering is performed at at least two locations sandwiching the large-diameter portion 12 in the middle of the pinion shaft 10. Small diameter part 1 that requires
1, 13, 15, semi-open coils 4, 5, 7 having inner diameters smaller than the outer diameter of the large diameter portion 12 are provided in close proximity to each other, and these coils 4, 5, 7
In the high-frequency tempered coil body formed in one line by connecting with connecting parts 3a, 3b, 6a, 6b,
The semi-open coils 4, 5, 7 have windows 4a, 5a,
It has a pair of coils 4b, 4c, 5b, 5c, 7b, 7c of the same shape arranged oppositely across 7a,
The connecting portions 3a, 3b, 6a, 6b are spaced apart from the pinion shaft 10 in parallel, and are orthogonally connected to the central portion of one of the coils 4b, 4c, 5b, 5c, 7b, 7c of each set. An induction tempered coil body characterized by: