JPS5923932B2 - gear shaping machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a Ferro-type gear shaping machine having a rotating shaft for supporting a workpiece and a cutter shaft rotating synchronously with the rotating shaft.

Conventionally, in order to cut so-called stepped gears that have gear parts in two or more places using a gear shaping machine, it is necessary to cut gears between gears that have the same helix angle and can be cut with the same cutter, but differ only in the number of teeth. Since it is necessary to manually change the setup for each of the following three operations, the stepped gear cannot be machined in one cycle.

(1) Replacing the indexing gear (2) Converting the work carrier cutting depth (3) Switching the cutter position Next, the manual setup changes in (1) to (3) above will be explained.

(1) Regarding the indexing gear, the conventional gear train is
As shown in the figure.

01 is the drive motor, 02 is the drive gear, 03 is the driven gear, 04 is the index gear (A), 05 is the intermediate gear, 06 is the index gear (B), 07 is the cutter shaft, and 08 is the workpiece. It is a rotating shaft for supporting materials, and the number of teeth has the following relational expression.

Zc Indexing gear (A) 04 Z Indexing gear (B) 06 However, Z - the number of teeth of the gear to be cut Zc - number of cutter teeth The indexing gear is replaced according to the above relational expression.

(2) The radial depth of cut of the work carrier, which determines the depth of cut (depth of cut and tooth thickness of the workpiece material) for converting the depth of cut of the workpiece carrier, is set separately for each stepped gear to be cut. do.

(3) Regarding switching of the cutter position, the cutting start point of the cutter is set separately by the distance of the step of the gear to be cut on the workpiece.

As described above, there are various methods for changing the setup in items (1) to (3) using known techniques, but each time the cutting location changes, the setup is changed manually.

The present invention is an apparatus that enables gear cutting of stepped gears with different numbers of teeth to be performed continuously in one cycle without changing setups, as long as the pitch, helix angle, and pressure angle are the same. The reason for this is that the gear train of change gears that synchronously rotates the cutter shaft and the rotating shaft for supporting the workpiece is multistage, and the change gear on the cutter shaft side reciprocates between the gear trains, and the cutter's reciprocating mechanism. It has an adjustment mechanism for the cutting stop position and an adjustment mechanism for the start position of the reciprocating movement of the cutter 2, and allows gear cutting of stepped gears to be performed without changing the setup.

That is, when the machining cycle according to the present invention is compared with the conventional example, the result is as shown in FIG.

FIG. 7a shows a conventional stepped gear machining cycle, and FIG. 7a shows a stepped gear machining cycle according to the present invention.

Embodiments according to the present invention will be explained with reference to the drawings shown in FIGS. 2 to 6.

Fig. 2 shows the gear train of the indexing gear, Fig. 3 shows the switching device for the workpiece carrier loading amount, and Figs.
FIG. 6 shows a cutter position switching device.

In Fig. 2, 1 is a drive motor, 2 is a drive gear, 3 is a driven gear, 4 is a cutter shaft side changing gear, and 5 is an intermediate gear (A
), 6 is an intermediate gear? B), 7 is a rotating shaft side replacement gear for supporting the workpiece (A), 8 is a rotational shaft side replacement gear for supporting the workpiece [B), 9 is a cutter shaft, 10 is a rotational shaft for supporting the workpiece,
11 is a cylinder, and the rotation of the drive motor 1 is transmitted to a driven gear 3 that meshes with the drive gear 2.

The cutter shaft side replacement gear 4 coaxial with the driven gear 3 is connected to the cylinder 1.
1 can mesh with both the intermediate gear (A) 5 and the intermediate gear [B) 6, so that the rotation is caused by the rotating shaft side replacement gear (A) 7 for supporting the workpiece and the rotating shaft for supporting the workpiece. The side switching gear (B) 8 is switched.

In Fig. 3, 21 is a limit switch box, 2
2 is a work carrier, 23 is a bed, 24 is a micrometer mounting plate, 25 is a micrometer (A), 26 is a push rod (A), 27 is a limit switch (A), 28 is a push rod (B), 29 is a The limit switch (B) and 30 are micrometers (B).

The work carrier 22 is sent in the radial direction (forward) to one gear of a stepped gear, which is the workpiece, and a micrometer (A) is used to set the cutting depth of the gear.
25 connects the limit switch (A) via the push rod (A) 26.
) 27 and is stopped by its signal.

Then the work carrier 2 for the other gear of the stepped gear
For the forward feed in the radial direction of step 2, a micrometer (B) 30 that sets the gear cutting depth of the gear is operated by a push rod (B).
) 28 to activate the limit switch (B) 29, and the work carrier 22 is stopped by this signal as described above.

These micrometers (A) 27, micrometers (
B) The scale setting of 30 is done before machining depending on the depth of cut of the gear to be machined.

The cutter spindle position for each processing gear of the stepped gear material is switched as shown in FIGS. 4 to 6.

31 is a cutter spindle, 32 is a cutter, 33 is a pinion shaft for vertically moving the cutter spindle 31, 34 is a link for rotating the pinion shaft 33, 34a is a cylinder chamber formed in the link 34, and 35 is a drive for driving the link 34. shaft,
36 is an adjustment screw, 37 is a piston that slides within the cylinder chamber 34a, 38 is a fixing nut, 39 is a joint bolt,
40 is an eccentric shaft, and 41 is a bolt for adjusting the amount of eccentricity.

A rack is carved into the cutter spindle 31, and a pinion of a pinion shaft 33 meshes with this rack.

Therefore, as the pinion shaft 33 reciprocates, the cutter spindle 31 moves linearly reciprocally in the axial direction, and the cutter 32 attached to the cutter spindle 31 performs gear cutting.

Reciprocating rotation of the pinion shaft 33 is obtained by reciprocating movement of the link 34 in the direction of arrow A.

Furthermore, the reciprocating motion of the link 34 is obtained by transmitting the rotation of the drive shaft 350 via the eccentric shaft 40.

The amount of movement of the cutter spindle 31 (the stroke of the cutter 32) can be changed by appropriately adjusting the amount of eccentricity of the eccentric shaft 40 with respect to the comb drive shaft 35 of the bolt 41.

The position of the cutter 32 is the pressure oil supply port 34 b t 34 c
Two-stage adjustment is possible by selecting and supplying hydraulic pressure to move the piston 37.

That is, the state shown in FIG. 5 is when hydraulic pressure is supplied from the pressure oil supply port 34b, and by supplying hydraulic pressure from the pressure oil supply port 34e and moving the piston 37 until it comes into contact with the adjustment screw 36, the state shown in the figure is achieved. The cutter spindle 31 is set at a position raised from the state by an amount corresponding to T via the pinion shaft 33.

Here, while cutting one gear B of the stepped gear as shown in FIG. 7, the piston 37 maintains the state shown in FIG. 5 by the oil pressure supplied from the pressure oil supply port 34b.

At this time, the rotating shaft 10 for supporting the workpiece is in a state where the micrometer (A) 25 has activated the limit switch cA) 27, and the coaxial shaft 10 and the cutter spindle 31
The rotation ratio is set by selecting a predetermined change gear.

To cut the other gear C, hydraulic pressure is supplied from the pressure oil supply port 34C to the cylinder chamber 34a, the piston 37 comes into contact with the end face of the adjusting screw 36, and the position of the cutter 32 is switched.

At this time, the rotating shaft 10 for supporting the workpiece is in a position close to the cutter spindle 31, and the rotation ratio thereof is set to a predetermined value.

The supply of hydraulic pressure and the position of the supply port are changed by a hydraulic power source and a switching valve (not shown).

Further, in order to adjust the position of the cutter 32 to each cutting position, the step of the gear to be cut is set in advance using the adjusting screw 36.

As explained above, the present invention enables continuous machining of stepped gears by one setup operation and in one cycle, and is particularly effective for gear cutting of cluster gears used in automobile transmissions. be.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing a gear train of a conventional indexing gear, Fig. 2 is an explanatory diagram showing a gear train of an embodiment according to the present invention, and Fig. 3 is an explanatory diagram showing a gear train of an embodiment according to the present invention. FIG. 4 is a front view showing the amount conversion, and FIG.
The figure is a plan view partially showing the details of FIG. 4 in cross section, FIG. 6 is a front view of FIG. 5, and FIG. 7 is an explanatory view showing the machining cycle of the stepped gear. 1... Drive motor, 2... Drive gear, 3... Driven gear, 4... Cutter shaft side change gear, 5...・Intermediate gear hole, 6...
Intermediate gear (B), 7, 8...Rotary shaft side replacement gear for supporting workpiece, 9...Cutter shaft, 10...
...Rotary shaft for supporting workpiece, 21...IJ
Mituto switch box, 22...Work carrier, 23...Bed, 24...Micrometer mounting plate, 25...Micrometer (
A), 26... Push rod (At, 27...
・Limit switch prisoner, 28...Push stick (B)
, 29... Limit switch (B), 30...
...Micrometer (B), 31...Cutter spindle, 32...Cutter, 33...
...Pinion shaft, 34...Link, 35...
...Drive shaft, 36...Adjustment screw, 37...
... Piston, 38 ... Fixing screw, 39
...Joint bolt, 40...Eccentric bolt.

Claims (1)

[Claims] 1. In a gear shaping machine in which a cutter shaft and a rotary shaft for supporting a workpiece are connected for synchronous rotation by a gear train including a change gear, the gear train of the change gear part is two stages, and the change gear on the cutter shaft side is Providing means for reciprocating the gear between both gear trains,
A means for setting two types of movement stop ends in a direction perpendicular to the axis of a rotary shaft for supporting a workpiece with respect to the cutter shaft, and a means for setting two types of start ends for axial movement of the cutter shaft,
A gear shaping machine characterized by comprising means for changing the setting end of each setting means based on the position of the change gear reciprocating means.