JPS58178022A - High-accuracy indexing coupling and manufacture thereof by simultaneous rectilinear tooth form forming - Google Patents

Abstract

PURPOSE:To provide a high-accuracy indexing coupling where opposed surfaces of two disc plates are provided with crown wheels engaged with each other by manufacturing a pair of teeth on the periphery positioned symmetrically relative to the center line of the disc plate by a simultaneous rectilinear tooth form forming. CONSTITUTION:A disc plate 1 is provided with a crown wheel 1' having a parallel mount passing through the center thereof, and a disc plate 2 engaged therewith is provided with a crown wheel 2' having a fan-shaped mount symmetrical relative to the center line thereof. Both crown wheels 1', 2' are engaged with each other to form a pair of couplings. Thus, both disc plates 1, 2 are respectively provided with a combination of mounts and valleys parallel to the center line thereof, so that a tool can be fed in a straight line in direction parallel to a straight line passing through the center of the disc plate. Therefore, one tooth surface A and another tooth surface B' positioned symmetrically relative to a center line (b)-(b) can be molded by one process so as to provide a high-accuracy indexing coupling.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a high-precision index coupling, and more particularly to a high-precision index coupling manufactured by simultaneous linear tooth forming and a method for manufacturing the same. It is.

[Background technology]

Crown gears that mesh with each other are provided on the opposing surfaces of two disks (or annular plates), and couplings that utilize the centripetal, no-pocket, and high-torque transmission characteristics of this pair of meshes are used for power transmission. It is used for circumferential angle indexing, etc.

Conventionally, as an example of a method for manufacturing crown gears that mesh with each other, there is a method in which a forming tool is fed in a circular arc to form the tooth profile, but this method requires a special machine dedicated to the tooth profile forming feeding mechanism and the shape of the forming blade. The drawback was that it required machinery and was expensive.

However, in other conventional methods, a radial tooth profile passing through the center of the disc is formed, but in this method, one tooth and another tooth located at a line symmetrical position in the circumferential direction are formed. It is impossible to form teeth in one stroke of forming movement.
Therefore, since each tooth must be molded one by one, processing time is required, and there are disadvantages in that cumulative errors are likely to occur.

[Purpose of the invention]

The present invention has been made in consideration of these circumstances, and its purpose is to manufacture a pair of teeth on the circumference that are line-symmetrical with respect to the disk center line by simultaneous linear tooth formation. The purpose of the present invention is to provide an extremely high-precision indexing camf0 ring.

[Description of preferred embodiments]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of an index coupling and a manufacturing method thereof according to the present invention will be described with reference to the drawings.

1 and 2 are perspective views showing first and second disks meshing with each other of a coupling partially formed with a tooth profile according to the present invention. First, the first disk, that is, the disk ■, is provided with a crown gear ■ having parallel peaks that pass through the center of the disk A crown gear ■ having fan-shaped peaks line-symmetrical to the center line of the plate ■ is provided, and a pair of couplings is constructed by meshing the crown gear ■ of the disk ■ and the crown gear ■ of the disk ■. It is.

In the disk ■, "parallel mountains" mean that the ridgeline of the mountain, that is, the upper edge of the tooth surface A or A' and the upper edge of the tooth surface B or B' pass through the center O of the flat surface F of the disk ■. A mountain that is parallel to the center line a-a. On the other hand, in disk ■, a ``fan-shaped mountain'' refers to a mountain whose two ridgelines are not parallel to each other and form a fan-shaped top surface between them. Therefore, the valleys of the disk ■ that should mesh with the "parallel peaks" of the disk ■ are formed as "parallel valleys," and the valleys of the disk ■ that should mesh with the "fan-shaped peaks" of the disk ■ are shaped as "fan-shaped." It is formed as a ``valley''.

According to the present invention, as described above, each of the disks (1) and (2) is provided with a combination of peaks parallel to the center line of the disks and valleys parallel to the center line of the disks. It is now possible to feed the tool in a straight line in the direction (for example, a-a), forming one tooth surface A and another tooth surface B', which is symmetrical with respect to the center line bb, in one stroke. It became possible. Similarly, the tooth flanks B and A', which are opposite to the tooth flanks A and B', respectively, can be formed in the same manner as the molding process of the tooth flanks A and B', or sequentially. be. Then, by performing a predetermined indexing in the circumferential direction and repeating the one-stroke linear motion described above, a tooth profile with a predetermined number of teeth can be formed around the entire circumference of the disc.

The fact that the above-mentioned mutually meshing tooth profile can be formed allows for relative linear movement of the workpiece and tool and equal pitch circumferential side extraction over the entire circumference of the disk ■ and the disk ■. It is very easy to set dimensions because all you need to do is set the direction of the relative linear motion of the workpiece and tool parallel to the line, and then set the index in the predetermined circumferential direction. . Therefore, there is an advantage that a predetermined tooth profile can be formed with high precision.

Furthermore, since the disk ■ and the tooth surface B', which is line-symmetrical to the tooth surface A in the circumferential direction of the disk ■, are sequentially and alternately formed, the dispersion of machining residual stress strain and thermal deformation strain is reduced. It is possible to minimize the cumulative pitch error, improve the dimensional accuracy of the tooth profile,
This has the significant effect of improving indexing accuracy and meshing tooth contact.

In order to form the above-mentioned tooth profile according to the present invention, it is only necessary to perform relative linear movement of the workpiece and the tool and angle indexing of the rotary table. It can be processed by installing a table and does not require any special machine tools unlike conventional methods, so it is inexpensive.

In addition, when mass production is attempted, by selecting special jigs and tools, the number of angle indexes in the circumferential direction of disk ■ and disk ■ can be reduced to half of the predetermined number of teeth. Because it is finished,
It is possible to shorten the machining time for forming all the tooth profiles, and also has the advantage of reducing the cost.

Next, several specific examples of the method of forming a tooth profile on a disk according to the present invention will be described with reference to FIG. 3 and subsequent figures.

The first method is to attach the side blade cutter (A) shown in Figure 3 to the milling machine, install the angle indexing table on the feed table, and place the disc ■ or disc ■ on the indexing table.
In this method, the number of teeth is fixed, and a predetermined number of teeth is formed by reciprocating linear movement of the feed table and setting the angle of the indexing plate.

The second method uses the side blade cutter (
In this method, the tooth profile is formed in the same manner by replacing (a) with the full-form milling cutter (b) shown in Fig. 4. In the case of this second method, compared to the first method, the tooth surface A (still tooth surface B) and the opposing tooth surface B'('l: bamboo tooth surface A') are simultaneously processed. Since it is cut, the number of indexes in the circumferential direction only needs to be half the number of teeth, and the machining time can be cut in half.

The third method is to set an angle indexing machine on the planing machine, and sequentially cut the tooth surface by feeding the bi I (C) shown in Fig. 5 or the general form part shown in Fig. 6, This is a method of forming tooth profiles.

In the fourth method, after cutting the tooth profile using the second or third method of No. 11 above, a surface grinder is used to grind the tooth surface using a disc grindstone (E) shown in FIG. 7 or a grindstone shown in FIG. 8. In this method, the dish-shaped grindstone shown is attached and the tooth surface is finished in the same manner as the first method described above.

Although the present invention has been described above with reference to preferred embodiments, the present invention is not limited to only what is shown in the drawings, and it should be noted that the manufacturing method, application, etc. of the coupling may be modified as appropriate within the scope of the present invention. Not even.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a coupling according to the present invention in which parallel ridge teeth are partially formed on the first disk, and Fig. 2 is a fan-shaped ridge tooth on the second disk. FIGS. 3 to 8 are perspective views, shown in partially formed condition; FIGS. 3 to 8 each schematically illustrate various tools suitable for use in the method of the invention; FIGS. [Explanation of main symbols] ■...First disc ■...First crown gear■...
・Second disc ■...Second crown gear A, B
, B'...Tooth surface F...Flat surface 0...Main patent applicant Shun Hayashi Engraving of the three drawings (no changes in content) Fig. 3\\\----n' Fig. 5 Fig. 6 Figure 7 Figure 8 Procedural amendment (method) % formula % 1 Indication of the case 1982 Patent Application No. 59011 3, Person making the amendment Relationship with the case Patent applicant Address Name Name Hayashi Shunzo

Claims (2)

[Claims] (1) A first crown gear in which a first disc has a peak parallel to its center line, and a second crown gear in which a second disc has a fan-shaped peak that is symmetrical about its center line. A coupling consisting of a gear and configured to alternately engage the parallel peaks and the fan-shaped peaks. (2) In the first disk and the second disk, tooth surfaces A and W, which are line-symmetrical with respect to the straight line b-b passing through the center of the flat surface, still face these tooth surfaces, respectively. Shape the tooth surface B and the tooth surface by one stroke operation in the direction a-a of the relative linear motion of the workpiece and tool using an appropriate tool, and repeat the same operation for the indexed number of teeth. Alternatively, a tooth forming method characterized in that the steps are sequentially repeated by an index of 1/2 of the set number of teeth to form a tooth profile with an equal pitch around the entire circumference of the first disc and the second disc.