JPS5853972B2 - Re-gearing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for re-cutting the tooth surface of a gear that has been properly cut.

For example, as one way to prevent gears from disengaging (commonly known as gear disengagement) in an automobile transmission, the method shown in FIG. 1a is shown.

As shown in b and c, the tooth surface on one side of the gear G1 of the synchronized hub G is re-cutted as shown in S to provide a step between it and the tooth surface S2 of the gear G2.

With this configuration, the coupling sleeve that has passed through the gear G2 and is located on the gear G0 becomes difficult to get caught in the gear G2 due to the step difference.

Conventionally, this synchronized bub G has the first step of cutting regular teeth around the entire circumference of the bub using a gear cutting machine, and then cutting the tooth surface S0 on one side of the gear G1 again using another gear cutting machine. Second to do
It is formed through a process.

However, this gear cutting method also requires an expensive gear cutting machine in the second step, resulting in high equipment costs.

In addition, in the second step, the gear is set on the gear cutting machine again and the same operation as gear cutting is performed, which takes a long time.

SUMMARY OF THE INVENTION An object of the present invention is to provide a gear re-cutting device that can eliminate the various drawbacks of the prior art as described above, reduce equipment costs, and shorten the gear-cutting time.

Hereinafter, preferred embodiments of the present invention will be described with reference to FIGS. 2 and 3.

A synchronized knob e (hereinafter referred to as a gear) having regular teeth cut in advance is carried in along a carrying path indicated by an arrow A.

30 is an entrance. A block 2 is fixed to the tip of the piston rod of the carry-in cylinder 1, and the gear G is pushed by the rounded concave surface 2a of the tip and inserted into a re-gearing position to be described later.

A guide wall 3 is formed on one side of a passage 32 through which the gear G is conveyed by the cylinder 1, and a pressing pad 5 elastically supported by a spring 4 is provided on the other side.

A rack 6 that fits the gear G is formed in the guide wall 3 from the middle.

7 is a stopper, and the gear G that has been rolling while meshing with the rack 6 comes into contact with it and stops at the re-gearing position.

Reference numeral 8 indicates a limit switch for the backward movement of the carry-in cylinder, and numeral 9 indicates a limit switch for the forward movement of the carry-in cylinder.

In accordance with the movement of the piston rod of the carry-in cylinder 1, the dog 2b formed on the block 2 contacts the contact 8a of the limit switch 8 at the backward limit, and the contact 9a of the limit switch 9 at the forward limit. It is designed to come into contact with.

21 is a proximity switch that detects the presence or absence of gear G.

As clearly shown in FIG. 2, a push-in pad 10 is arranged at the re-gearing position, and the pad is connected to the piston rod 12 of the cylinder 11 via a connecting rod 13.

An ejector pad 14 faces the push-in pad 10.
The pad 14 is connected via a connecting rod 17 to a piston rod 16 of a cylinder 15 on which low oil pressure is constantly applied.

The re-cutting means includes a guide 18 in the form of an internal gear that matches the outer shape of the gear G, and a cutter 19 having a cutting edge 19a corresponding to each tooth of the gear G.

The gear G positioned on the ejector pad 14 is pushed down by the pusher pad 10, and moves downward while being guided by the guide 18 while resisting the pushing up force of the ejector pad 14. Only one side of the tooth flank of the gear G1 is re-cut.

Reference numeral 20 designates a cutting oil injection pipe, through which cutting oil is injected into the upper end surface of the cutter 19 and discharged from cutting oil outlets 22 and 23 together with chips.

When the pushing pad 10 rises after re-cutting the gears, the gear G is pushed up by the ejector pad 14 and returned to its original position (the state shown in FIG. 2).

As shown in FIG. 3, the discharging pad 24 has a V-shaped tip 24a, and a rear end fixed to the piston rod 26 of the discharging cylinder 25.

Although details are not shown, a passage 3a is formed by cutting out the lower part of the guide wall 3, and the carrying out pad 24 enters and exits through the passage 3a.

The re-geared gear G is placed at the tip 24 of its carrying-out pad 24.
a and is pushed in the direction of arrow B and is carried out from the outlet 31.

Reference numeral 2γ indicates a limit switch as far as the retraction of the carry-out cylinder, and 28 indicates a limit switch as far as the forward movement of the carry-out cylinder.

The dog 24b formed on the carry-out pad 24 contacts the contact 27a of the backward limit switch 27 at the backward limit, and contacts the contact 28a of the forward limit switch 28 at the forward limit.
It has come into contact with.

The frame 29 includes a bush 29a that slidably guides the push pad 10, and the cylinder 11 is attached to the bush 29a.

The operation of the gear re-cutting device described above will be explained.

The pre-geared gear is carried in along the carrying route shown by arrow A.

At this time, the gear G is transported to the position of the ejector pad 14 by the block 2 using the transport cylinder 1.

At that time, the gear G is elastically moved to the guide wall 3 by the pressing pad 5.
It moves forward while being pressed by the rack 6, eventually engages with the rack 6, rolls on the rack 6, and is stopped by the stopper 7.

In this position, the gear is therefore ready to be guided by the guide 18.

Then, the carry-in cylinder 1 is controlled so that the dog 2b returns to its original position in response to a signal by activating the forward limit switch 9 and the backward limit switch 8.

On the other hand, the pushing pad 10 is lowered by the operation of the cylinder 11, and thereby the gear G is also lowered while being guided by the guide 18 while resisting the pushing up force of the ejector pad 14.
The cutting blade 19a re-cuts only one tooth surface of the gear G1 of the gear G.

After gear cutting is completed, when the push pad 10 rises, the gear G
is pushed up by the ejector pad 14 and returns to the stopper 7.

Then, the unloading cylinder 25 is activated, and the unloading pad 2
The gear G is pushed in the direction of arrow B with the tip 24a of the gear G and is carried out from the outlet 31.

Note that the present invention can be applied not only to gears but also to spline teeth.

Since the present invention is configured as described above, the following effects can be obtained.

(1) Re-gear cutting can be performed automatically from positioning to gear cutting without setting the gear on a gear cutting machine, so the re-gear cutting time can be significantly reduced.

(2) Since the gears can be easily positioned using racks, stoppers, etc. without using an expensive gear cutting machine, the mechanism is simple and the equipment cost is extremely low.

(3) In addition, the positioning of the gear relative to the cutting blade is performed by a combination of a rack provided along the gear delivery path, a stopper, and a concave surface that pushes the gear to the stopper, ensuring accurate positioning, and furthermore, The gears are guided by an internal gear-shaped guide lined up and re-cut, resulting in extremely high precision.

[Brief explanation of drawings]

Figure 1a is a perspective view showing an example of a gear targeted by the gear re-cutting device of the present invention, Figures 1 and 2c are explanatory diagrams of the gear shown in Figure 1a, and Figure 2 is an illustration of the gear according to the present invention. FIG. 3 is a schematic diagram showing an example of a gear re-cutting device, and FIG. 3 is a schematic plan view taken along the line XX in FIG. 2. 1... Carrying cylinder, 2... Block, 3... Guide wall, 4... Spring, 5... Pressing butt, 6 ······rack,
7...Stopper 8...Reverse limit switch, 9...Forward limit switch, 10...Pushing butt, 11...Cylinder , 12...piston rod, 13, 17...
...Connecting rod, 14, 15...
... Ejector butt, 16 ... Piston rod, 18 ... Guide, 19 ... Cutter, 20 ... Cutting oil injection pipe, 22.23
...Cutting oil outlet, 24...Carry-out vat, 25...Carry-out cylinder, 26...
Piston rod, 27... Reverse limit switch, 28... Forward limit switch, 29
...Frame.

Claims (1)

[Claims] 1. A gear carrying means, a means for positioning the carried gear at a predetermined position, and an internal gear type guide provided corresponding to the predetermined position and equipped with teeth that match the outer shape of the gear. A re-gear cutting means having a cutter having a cutting edge corresponding to each tooth of the gear, a means for providing relative movement between the re-gear cutting means and the positioned gear, and carrying out the re-gear cut gear. The means for positioning is provided horizontally along the delivery path, and includes a rack that meshes with the gear, a stopper that brings the gear into contact with the rack while being meshed with the rack, and a concave shape that pushes the gear to the stopper. Furthermore, a guide and a cutter are placed concentrically in the vertical direction in order directly below the position where the gear is positioned by the rack and stopper, and the gear is moved by lowering a push butt provided directly above the positioning position. This gear re-cutting device has a configuration in which the gear is lowered while being guided by a guide while being positioned, and the gear is re-cut with a cutter.