JPH02142953A - Automatic meshing mechanism for forming rack and gear - Google Patents

Abstract

PURPOSE:To make phase alignment for a finishing rolled gear automatically performable by attaching an auxiliary rack retractably in the edge of a forming rack. CONSTITUTION:A recess 16 is formed in the edge of a forming rack 12, and an auxiliary rack 18 is fitted in it free of slide motion, while this auxiliary rack is energized by compression springs 20, 20. A pitch surface P2 of this auxiliary rack 18 is tilted to a pitch surface P1 of the forming rack 12, and both these pitch surfaces are made so as to be continued on a connecting surface. A rough-machined gear is set for rolling and then the forming rack is made to come nearer to it by degrees. When the phase between this gear 14 and the forming rack 12 is shifted to some extent, a tip of the auxiliary rack 18 contacts and retracts therefrom, thus any damage to the gear 14 is avoided. Afterward, a contact position of the tip is gradually shifted by pitch differences, and the auxiliary rack is reset at a time when they are fully engaged with each other. Doing like this, phase alignment by man power is no longer required, so that reduction in sharp manufacturing cost is made attainable.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention meshes a forming rack with the tooth i1 that has been gear-cut by a hobbing machine or the like, and plastically deforms the tooth surface of the gear to obtain a finished surface close to a mirror surface. The present invention relates to an automatic meshing mechanism for matching the phases of a forming rack and gears during processing.

Conventional technology and its issues For gears, the finishing rolling process is carried out by a specialist.

Finish rolling of a gear is, for example, a processing method as shown in FIGS. 6 and 7, in which a gear cutting part 34 such as a spindle 30, which is supported so as to be able to rotate freely once, is moved by a pair of forming racks 32 approaching from both directions. This is a method that attempts to obtain good finished surface accuracy by blending between .32 and 32.

When the gear cutting portion 34 is set to match the phase of the forming rack 32 as shown in FIG. In this case, the gear cutter 34 does not mesh with the advancing of the forming rack 32, and the tip of the gear cutter 34 collides with the first tooth surface of the forming rack 32, crushing that tooth.

For this reason, conventionally, the position where the phases of the gear cutting part 34 and the forming rack 32 match is checked f times, and each time the gear cutting part 34 is set, the phase matching position (the eighth
Figure) was aligned visually.

However, since these confirmation work and phase matching work are both performed manually, the reliability of the work is not perfect, and it is time-consuming, so automation has been desired.

Means for Solving the Problems The present invention provides an auxiliary rack having an inclined pitch surface continuous with the pitch surface of the forming rack at the end of the forming rack so as to be recessed from the pitch surface of the forming rack. The above problem was solved by the supported automatic interlocking mechanism.

When the working gear is set to undergo rolling, the forming rack moves toward the gear. When the gear and forming rack are in phase, the gear rotates guided by the teeth of the auxiliary rack and smoothly enters the teeth of the forming rack.

If the gear and forming crack are out of phase, the gear tooth tip will collide with the tooth tip of the auxiliary rack, but as the rack advances further, the contact positions of the mutual tooth tips will gradually shift until they completely shift. When.

The auxiliary rack will completely mesh with the gear due to its biasing force. As a result, the auxiliary rack returns to its original position and connects the forming crack to the pitch surface. Then, the gear matches the phase with the forming rack and enters the forming rack while rotating.

Embodiment FIG. 1 is a vertical view of an automatic meshing mechanism 10 of the present invention. Reference numeral 12 indicates a forming rack.

Four parts 16 are formed at the end 12a of the forming rack 12. An auxiliary rack 18 is fitted into the recess 16 so as to be slidable in the vertical direction in the drawing. Recess 16
Compression springs 20, 20 are provided between the bottom surface of the auxiliary rack 18 and the auxiliary rack 18.
is attached, and the auxiliary rack 18 is equipped with compression springs 20,
It is urged downward in the drawing by the urging force 20. 22 is a limit switch.

FIG. 2 is a top view taken along line 2-2 in FIG. 1, in which a presser plate 24 for restricting the protrusion of the auxiliary rack 18 is identified on the forming rack 12. With this structure, the pitch plane P2 of the auxiliary rack 18 can be continuous with the pitch plane P1 of the forming rack 12.

Returning to FIG. 1, the pitch LM P2 of the auxiliary rack 18 is inclined with respect to the pinch surface P1 of the forming rack 12, and the auxiliary rank 18 is aligned with the forming rack 12 at the most protruding position, and The pitch surface is continuous. In the figure, the pitch plane P2 of the auxiliary rack 18 is each arc-shaped, but both pitch planes I)1. As long as P2 is continuous, a simple gradient may be sufficient.

The forming racks 12 are originally arranged so as to sandwich the gear (4-1) or to face each other from side to side.

1 only shows the forming rack on one side. However, the automatic meshing mechanism 10 only needs to be provided on at least one forming rack.

3 to 5 show the above-mentioned automatic meshing mechanism 10.
1 is a series of diagrams showing the operation of the FIG. In addition, in these figures, 1
For convenience, the rank is depicted as being fixed and the gear moving, but in reality it is the opposite.

The roughened gear 14 is set to undergo rolling. The setting is done randomly using a feeder (not shown). When the forming rack 12 approaches the tooth +li] 4, the gear 14 is guided by the teeth of the auxiliary rack 18, rotates, and enters the forming rack 12, if the two coincidentally have the same phase. In this case, the automatic engagement mechanism 10 of the present invention does not particularly function, but the auxiliary rack 18 is inclined, so that it can enter the forming rack 12 smoothly.

If the gear 14 and the forming rack 12 are out of phase, the tooth tip of the gear 14 and the auxiliary rack 18 may be out of phase as shown in FIG.
The tips of the teeth contact each other, and the auxiliary rack 18 receives a reaction force from the 1R wheel 111. Since the pitch plane P2 of the auxiliary rack 18 is inclined with respect to the pitch plane P1 of the forming rack 12, the auxiliary rack 18 retracts under the force of the compression springs 20, 20 in the reverse biasing direction, and the gear 14 Avoid damage. The limit switch 22 detects that the phase is shifted due to the retraction of the auxiliary rack 18.

When the forming rack 12 further advances, the gear 14
rotates while contacting the tips of the teeth of the auxiliary rack 18. Since the pitch of the auxiliary rack 18 is different from the pitch of the gear 14, as the VI wheel 14 rotates, the contact position of the tooth tips gradually shifts as shown in FIG. When the tips of the teeth are completely shifted from each other as shown in FIG. 5, the gear 14 can rotate freely.

Since the auxiliary rack 18 is biased by the compression springs 20, 20, they are completely engaged in a 'J' manner, and the auxiliary rack 18 returns to the position where each pitch plane PL, I''2 is continuous. When the limit switch 22 returns to its original state, the forming rack 12 and the auxiliary rack 18
Each pitch plane P L of .

It is detected that P2 is aligned, and the progress of the forming rack 12 is not obstructed. If such a situation does not occur, a signal from the limit switch 22 can be used to take measures such as stopping the operation.

In the state shown in FIG. 5, the gear 14 and the forming rack 12
are synchronized in phase ζ. The gears 14 thus enter the forming rack 12 in phase.

Note that the biasing force for returning the auxiliary rack 18 does not necessarily need to be provided by the compression spring 20. Forming rack 12
Regardless if they are placed horizontally opposite each other, the upper F
In what is placed in.

It can be returned to its original position by the weight of the auxiliary rack.

Since the auxiliary rack 18 performs the above operations, it is preferable that it be made of nonferrous metal or nonmetallic material, such as synthetic resin, so as not to damage the gear 14 and to respond smoothly to the movement of the gear. .

Effects of the Invention Since the present invention has the above-described configuration, there is no need to confirm the phase between the gear and the forming rack in advance, there is no need for one-man manual phase alignment, and all mechanical operations (movement of the rack) are performed. (only) can automatically and reliably match the phases. Therefore, the gears can be continuously fed even by random feeding, and can be easily adapted to robotization, so that it is possible to significantly reduce man-hours and manufacturing costs.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal open view of the automatic meshing mechanism according to the present invention, FIG. 2 is a sectional view taken along line 2-2 in FIG. 1, and FIGS. 3 to 5 are explanatory diagrams of the operation of the automatic meshing mechanism. FIGS. 6 to 9 are explanatory views of the conventional gear finish rolling process. 10...Automatic meshing mechanism 12...Forming rack 12a...End portion 14...Gear 18...Auxiliary rack Pl...Pitch surface P2 of forming rack...First pitch surface of auxiliary rack Figure 2 Figure 3, Shell 6 μ・tsu, ``Written Amendment of Procedure dated 77117/1999, Chief Minister's Palace 1, Indication Patent Application No. 63-296350 2, Title of Invention 4 , (:135) Tsubakimoto Chain Co., Ltd. 16-7 Toranomon 2-chome, Minato-ku, Tokyo 105 Column 7 of the detailed description of the invention of F Specification/Fll Contents of the amendmentFll Specification-2 Page 2 Line 1 ``A gear is a gear.'' ``A gear is its shape.'' As one of the processes, L-rolling is performed. ” he corrected. (2) From page 8, line 8 to line 13 [It is possible... Delete the word J. Above Figure 6 Figure 8 Figure 9

Claims (1)

[Scope of Claims] An auxiliary rack having an inclined pitch plane that is continuous with the pitch plane of the forming rack is biased and supported at the end of the forming rack so that it can be retracted from the pitch plane of the forming rack. Automatic meshing mechanism of forming rack and gears.