JP2001179385A - Gear-toothed ring and manufacturing method of the ring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gear-toothed ring and a manufacturing method of the ring capable of widening general purpose use of a material, reducing the weight and saving the cost. SOLUTION: In the method for forming a convex gear tooth 6 by punching a plate material 2 into a concave part 11 of a die 9 of a transfer side by a convex part 12 of a punch 10, the head of the convex part 12 that is formed into a pinnacle shape is inserted into the concave part 11 having a negative clearance that is a clearance of the gear tooth width W direction between a base part 15 of the convex part 12 and the concave part 11. Then the material is formed by compression molding at the concave part 11 after extruded therein. It is possible to use a thin-thick material as the convex part 12 actively presses and pushes the material into the concave part 11, and also possible to use a low ductile material since hydrostatic pressure is available to act on the material that floods out from the concave part 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for manufacturing a toothed ring suitable for a sensor ring of an antilock brake system (ABS) of a vehicle, and a toothed ring.

[0002]

2. Description of the Related Art Vehicles such as trucks and passenger cars are equipped with an antilock brake system (ABS). In this case, a sensor ring is attached to the axle to detect the rotational speed of the axle and perform brake control.

[0003] The present applicant has previously proposed a toothed ring as a pressed product suitable for this type of sensor ring (see JP-A-9-150234). As shown in FIG. 4, the toothed ring 1 is integrally formed of a plate-like material 2 (for example, a steel plate) made entirely of a magnetic material, and has a cylindrical portion 3 that is a press-fit portion to an axle or the like, and an upper end position thereof. And a ring-shaped flange portion 4 that continuously extends radially outward. The flange portion 4 is sheared in the thickness direction to be formed into an uneven shape, and a plurality of convex teeth 6 project from the surface of the flange portion 4 by a predetermined height. A plurality of convex teeth 6 are provided at equal intervals in the circumferential direction.

In detecting the axle rotation speed, a magnetic sensor M is installed facing the surface (upper surface) of the flange portion 4, and the magnetic sensor M generates a pulse each time the convex tooth 6 passes. Thus, the number of pulses per time can be counted by a control device (not shown), and the axle rotation speed can be determined.

As a method of manufacturing the toothed ring 1, a ring-shaped plate 21 as shown in FIG. 2 is used as a raw material, and this is subjected to burring as shown in FIG. 3 to provide a cylindrical portion 3 and a flange portion 4. . Then, as shown in FIG. 5, the flange portion 4 is sandwiched from the front and back sides by the uneven punch 22 and the transfer side die 23, and is subjected to a shearing process, particularly a semi-shearing process.
In this way, the convex teeth 6 are formed on the flange portion 4, and the toothed ring 1 as a product is completed. The flange portion 4 located between the convex teeth 6 is referred to as a concave portion 7.

[0006] In particular, in the convex tooth forming step shown in FIG. 5, the surface of the flange portion 4 is placed on the transfer die 23 with the surface thereof facing down, and then the punch 22 is lowered to transfer the material to the die 2.
3 is pressed into the concave portion 24 by the convex portion 25 of the punch 22 to form the convex teeth 6. Since the inner surface of the concave portion 24 serves as a transfer surface of the convex teeth 6, the product shape of the convex teeth 6 can be obtained by the above-described pressing.

[0007]

By the way, in consideration of the strength (thickness) of the connection portion between the concave and convex teeth, the concave tooth 24 of the die 23 and the convex A slight clearance C was provided between the portion 25 and the tooth width direction.

However, this clearance causes the material to elongate, and a material having low ductility (low-grade material) may cause a crack in the same portion. Such a processing method based on elongation of a material requires a material having high ductility, and for example, a material having low ductility such as ferritic stainless steel having magnetism may not be used. In order to ensure ductility and prevent the material from running out, a somewhat thicker material is required. This is disadvantageous for weight reduction and cost reduction.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for manufacturing a toothed ring and a toothed ring capable of expanding the versatility of a material and reducing the weight and cost.

[0010]

SUMMARY OF THE INVENTION The present invention relates to a method of manufacturing a toothed ring in which a plate-like material is pushed into a concave portion of a transfer die by a convex portion of a punch to form a convex tooth. The clearance in the tooth width direction between the base end portion and the concave portion is defined as a negative clearance, the distal end portion of the convex portion is formed in a pointed shape, and this is inserted into the concave portion, and the material is extruded into the concave portion. Then, the material is compression molded in the recess.

The present invention also relates to a toothed ring in which convex teeth are integrally provided on the surface of a ring-shaped flange portion, wherein the back side of the convex teeth is depressed, and the maximum depth position of the depression is determined by the flange. It is located on the convex tooth surface side from the part surface.

Here, it is preferable that the convex teeth have a minimum thickness at the maximum depth position of the depression, and the minimum thickness is smaller than the thickness of the flange portion.

[0013]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

The overall configuration of the toothed ring according to the embodiment is the same as the conventional one as shown in FIG. That is, the toothed ring 1 is integrally formed using a plate-like material 2 (for example, a steel plate) made of a magnetic material, and a cylindrical portion 3 which is a press-fit portion to an axle or the like.
And a ring plate-shaped flange portion 4 that continuously extends radially outward from the upper end position. The cylindrical portion 3 and the flange portion 4 are formed by burring as described above. A plurality of convex teeth 6 having a predetermined height H (see FIG. 1) are provided at regular intervals in the circumferential direction on the surface (upper surface) of the flange portion 4. It is preferable that the height H of the convex teeth 6 be as large as possible for rotation detection. The portion between the convex teeth 6 in the flange portion 4 is defined as a concave portion 7 (see FIG. 1). The toothed ring 1 is a pressed product, and can be easily and inexpensively manufactured using only a general-purpose press.

Hereinafter, a method of forming the convex teeth 6 will be described. FIG. 1 shows a cross section along the ring circumferential direction or the tooth width direction of the convex teeth 6. The tooth width of the convex teeth 6 is indicated by W, and the center of the tooth width is indicated by C. Conventionally, the transfer side die 9 which is a fixed type and a lower die and the punch 10 which is an elevating type and an upper die are used. The transfer side die 9 has a concave portion 11 serving as a transfer surface of the convex tooth 6.
However, each of the punches 10 is provided with a convex portion 12 for pushing the material into the concave portion 11. The concave portions 11 and the convex portions 12 are, of course, provided at the same number and intervals as the convex teeth 6 in the circumferential direction of the transfer die 9 and the punch 10. The figure shows the punch 10
Shows the state immediately after the maximum stroke is lowered and the convex teeth 6 are formed.

The concave portion 11 has a somewhat wide rectangular cross-sectional shape, and corners at both ends in the tooth width direction located at the upper end thereof are formed as a predetermined round surface 13. Upper surface 14 of transfer side die 9
The transfer surface of the concave portion 7 forms a flat surface.

The convex portion 12 has a base end 1 having a substantially constant width.
5 and a tip portion 16 formed in a pointed shape. The base end portion 15 is wider than the concave portion 11. This makes the base end 1
The clearance in the tooth width direction between the groove 5 and the recess 11 is negative.
In addition, as shown in FIG. 5, conventionally, the clearance C was a positive value.

On the other hand, the tip 16 is formed in a pointed shape, and only a part of the tip enters the recess 11. Here, the distal end portion 16 is formed in a mountain shape, and the seam between the distal end portion 16 and the base end portion 15 and the distal end surface of the distal end portion 16 are predetermined round surfaces 17 and 18. Round surface 17
And 18, an inclined surface 19 is formed.
Faces the round surface 13 of the transfer side die 9 at the end of the convex tooth molding. In this case the thickness t ₁ of sufficient strength mutual gap is formed. The concave portion 11, the convex portion 12, and the convex tooth 6 have a symmetrical shape with respect to the tooth width center C.

In the convex tooth forming step, the flange 4
The surface of (thickness t) is placed on the transfer side die 9 with the surface thereof facing down, then the punch 10 is lowered, and the material is pushed into the concave portion 11 of the die 9 by the convex portion 12 of the punch 10 to form a convex tooth. Form 6 At this time, the tip of the tip 16 of the projection 12 is positioned lower than the upper surface 14 of the transfer die 9 so that the
1, the material can be extruded into the recess 11, and then the material in the recess 11 can be compression-molded and positively pressed against the transfer surface, which is the inner surface of the recess 11. Thereby, a desired convex tooth shape can be obtained.

At this time, excess material in the concave portion 11 overflows from the concave portion 11 through a gap between the inclined surface 19 and the round surface 13.
Since the clearance in the tooth width direction between the groove 5 and the recess 11 is negative, compression molding is performed between the inclined surface 19 and the round surface 13. That is, the material between the convex teeth 6 and the concave portions 7 can be deformed while applying a sufficient hydrostatic pressure. This is significantly different from the conventional shearing and stretching method. As a result, a material having low ductility such as ferrite stainless steel can be used, and the versatility and lower grade of the material can be remarkably expanded.

Further, according to such a method, the thickness t of the material can be made smaller than in the prior art. According to the prototype of the inventor, the plate thickness t, which was 4 (mm) in the conventional half-shear method, could be reduced to about 2.6 (mm). Of course, the height H of the convex teeth 6 is the same. This is because the material can be brought into close contact with the inner surface of the concave portion 11 and the tooth shape of the convex tooth 6 can be formed even with a small amount of material because the material is more actively pushed out by the convex portion 12 than before. By reducing the thickness of such a material, it is possible to significantly reduce the weight and cost.

In the finished product, the back side of the convex tooth 6 is recessed so that the center C of the tooth width becomes the minimum thickness tmin. And the position P which is the maximum depth of the depression
Is more convex surface 6 than concave surface 7a (flange surface).
a side. In addition, the minimum thickness tmin is
Is smaller than the thickness t. As described above, the convex teeth themselves are also reduced in thickness, so that weight reduction is achieved.

The embodiments of the present invention are not limited to those described above. For example, it is possible to form an appropriate taper angle on the concave portion 11 and the base end portion 15 of the convex portion 12 for die cutting. Other shapes of the concave portion 11 and the convex portion 12 are also conceivable. The flange portion may be provided radially inward of the cylindrical portion. The cylindrical portion may have a stepped shape. Although the toothed ring of the present invention is suitable for an ABS sensor ring, various other application examples are conceivable.

[0024]

The present invention exhibits the following excellent effects.

(1) The versatility and lower grade of the material can be expanded.

(2) Weight and cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a method for forming a convex tooth according to the present invention.

FIG. 2 is a perspective view showing a ring-shaped plate-shaped material.

FIG. 3 is a perspective view showing an intermediate molded product after forming a cylindrical portion and a flange portion.

FIG. 4 is an overall perspective view showing a toothed ring as a product.

FIG. 5 is a longitudinal sectional view showing a conventional method for forming a convex tooth.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 toothed ring 2 plate material 4 flange 6 convex tooth 6 a convex tooth surface 7 concave surface 7 a concave surface (flange surface) 8 upper die 9 transfer side die 10 punch 11 concave 12 convex 15 base end H convex tooth Height P Maximum depth of depression tmin Minimum thickness of convex teeth t Thickness of flange (plate thickness) W Tooth width

Claims (3)

[Claims] 1. A method of manufacturing a toothed ring in which a plate-like material is pressed into a concave portion of a transfer side die with a convex portion of a punch to form a convex tooth, wherein a base end portion of the convex portion and the concave portion are formed. The clearance in the tooth width direction is a negative clearance, the tip of the convex portion is formed in a pointed shape, and this is inserted into the concave portion, and the material is extruded and molded into the concave portion. And a method for producing a toothed ring. 2. A toothed ring in which convex teeth are integrally provided on the surface of a ring plate-like flange portion, wherein the back side of the convex teeth is depressed, and the maximum depth position of the depression is determined from the surface of the flange portion. A toothed ring characterized in that the toothed ring is also located on the convex tooth surface side. 3. The toothed ring according to claim 2, wherein the convex teeth have a minimum thickness at a maximum depth position of the depression, and the minimum thickness is smaller than a thickness of the flange portion.