JPS6028612B2 - bevel gear gear cutting device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a gear cutting device with three gears.

All tooth traces of a bevel gear are directed toward the apex, and the size of the cross section changes continuously from the end closest to the apex, that is, the small end, to the farthest end, that is, the large end.

Therefore, bevel gears are more difficult to cut than spur gears. As for gear cutting methods for bevel gears, there are three methods similar to those for spur gears: template method, molding method, and generation method, but the typical method is the tracing method using the template described above. , Billgram's method, Reinetska method, Green method, etc. are known. The tracing method of the template method is
Using the shape of the straight gear, place the template at a certain position from the apex of the cone, place the cutter between the apex of the cone and the template, and move the cutter along the template so that it always points towards the point of the pitch cone. This method involves making linear reciprocating motion to cut one tooth at a time, resulting in low cutting efficiency and the inconvenience of having to change templates depending on the gear being cut.

On the other hand, the Pilgram and Rinecker methods assume a virtual crown gear, position the gear material so that it meshes with it and roll, and place one of the tooth surfaces of the virtual crown gear on the opposite side of the mounting shaft of the gear material. The gear material is applied to the cutter representing the imaginary crown gear to make a motion as if it were rolling on the teeth of the virtual crown gear to cut the teeth.The cutter installation has to be changed to finish one side at a time, resulting in extremely low cutting efficiency and poor precision. is not obtained.

In addition, in the green method, a linear cutter representing the left and right sides of the teeth of the crown gear is reciprocated on a rocking plate that rotates the crown gear.
The gear material is rotated so that it meshes ideally with the crown gear, and the teeth are cut out one by one to create an integral tooth profile.The cutting efficiency is higher than that of the profiling method described above. Although this method has high accuracy, it cannot be expected to significantly improve efficiency because the cutter moves reciprocatingly to cut, as with the profiling method described above, and because cutting is performed intermittently compared to continuous cutting using a rotating hob, it is possible to cut with smooth ingots. It has the disadvantage that a curve cannot be obtained.

The present invention has been made in view of the above-mentioned drawbacks, and is designed to hold a conical gear material (including a crown gear "inner cage gear") so as to rotate around its conical material shaft, and rotate this gear material at a low speed. At the same time, while the material is rotated by the pitch of the gear teeth by a cam plate that rotates with the gear material at a cycle, the gear material is oscillated on the conical shaft surface by the tooth height, and the high-speed rotating cutter is moved to the material generatrix. The cutting movement is performed sequentially in the direction to create a tooth profile such as an impolute, making it possible to cut gears extremely efficiently and with high precision.

Hereinafter, the present invention will be described in detail based on an embodiment shown in the accompanying drawings.

In the figure, 1 is a base, and a support shaft 2 is erected on the base 1.

Further, a fixed base 8 is disposed on the base 1, which is rotatable around the rattan wire of the support shaft 2, and whose rotational position can be adjusted as appropriate and fixed to the base 1. The base 1 has a substantially semicircular plan view, and the support shaft 2 is located at the center of the outer arc.
will be erected.

The base 11 also has semicircular guide grooves 3, 3, 3 centered around the support shaft 2 on its upper surface, and toothed portions 4 on its peripheral surface. ``Rollers S, 6, 6 protruding from the lower surface of the fixed base 5, one end of which is pivotally supported by the support shaft 2, are accommodated in the guide grooves 3, 3, 3. is engaged with a pinion 8 of a rotation and calendar adjustment section 7 fixed to the end of the fixed base 5.This rotation position adjustment section 7 is rotatably vertically attached to a holding case 9 attached to the fixed base 5. A worm wheel 11 of a pinion shaft 10 which is inserted and held and has the pinion 8 attached to its lower end, and the worm wheel 1
1, and an adjusting knob 14 fixed to one end of the worm shaft 13 in order to rotate the worm shaft 13.By rotating the adjusting knob 14, the worm 12 rotates the pinion shaft 10 through the worm wheel 11.
The fixed base 5 is moved along the toothed part 4 of the base 1 by the pinion 8 which rotates and meshes with the toothed part 4, and the fixed base 5 is rotated to an arbitrary rotation position with respect to the base 1. It is designed to be held fixed in position. On the fixed base 5, there is a trochanter 5 whose distance from the support shaft 2 can be adjusted.
1 is placed.

This trochanter 51 has a pair of guide grooves 15, 15 provided on the fixed base 5 in a direction perpendicular to the support shaft 2.
5 and is fixed with its axis upright on a holding table 16 which can be moved. This holding table 16 is
A female screw piece 19 and rollers 17, 17 housed in guide grooves 5, 15 are projected from the lower surface of the female mating piece 19.
A knob 20 fixed to the rear end of the feed screw hole 18 is screwed into the feed screw hole 18 parallel to the guide grooves 15, 15 and cantilevered on the outer edge 5a of the fixed base 5, and rotated. By doing so, without the holding table 16, the trochanter 51 is placed in the guide groove 1.
It is designed so that it can be moved along lines 5 and 15. A swing base 22 pivotally connected to the support shaft 2 is disposed above the fixed base 5.

On this swing base 22, a holding mechanism support member 24 for the gear material M, and a rotary swing mechanism support member 27 for rotating the gear material M and swinging the swing base 22 are provided.
Each of them is arranged so that the distance from the support shaft 2 can be adjusted. The holding mechanism support member 24 and the rotational swing mechanism support member 27 are constructed by forming a pair of guide grooves 23, 23 on the swing base 22 on the support shaft 2, in the same way as when the holding table 16 is arranged on the fixed base 5. The guide grooves 23 and 23 are formed at right angles to each other, and protrude from the lower surfaces of the holding mechanism support member 24 and the rotational swing mechanism support member 27 within the guide grooves 23, 23. - Store the rollers 17, 17. Furthermore, "the holding mechanism support member 24 and the rotational swing mechanism support member 27 are provided with female thread pieces 30, 31, and the female thread pieces 30, 31
Feed screw punches 28, 29 which are cantilevered on the outer end wall 22a of the swing base 22 and are parallel to the guide grooves 23, 23 are screwed together, and are fixed to the rear ends of the feed screw punches 28, 29. By rotating the adjustment knobs 32 and 33, the holding mechanism support member 2
4 and the rotary swing mechanism support member 27 are movable along guide grooves 23, 23. The holding mechanism support member 24 has a holding cylinder 34 at its tip that holds the gear material M so that the extension of its marquee line is perpendicular to the extension of the axis of the support shaft 2. is arranged so as to be rotatable with the axis of rotation.

That is, the holding cylinder 34 and the gear blank M held at the tip of the holding cylinder 34 are on the same D axis, and the rotation of the holding cylinder 34 causes the gear blank M to rotate about its axis. Note that a brake 35 is disposed on this holding cylinder 34. This brake 35 is pivotally supported at one end and has a pair of brake bands 39, 39.
A braking force adjusting screw punch 38 on which a spring 37 is applied is arranged at the free end of the shaft 39. Further, the rotary swing mechanism support member 27 is provided with a horizontal shaft 41 and a vertical shaft 45, which are rotated by an electric motor 47, and the horizontal shaft 41 is located above the holding cylinder 34 and is located above the holding cylinder 34. The tip is connected to the rear end of the holding cylinder 34 by a key connecting part 40 so that it can be inserted and removed.

A worm 43 is provided on a drive shaft 44 of an electric motor 47, and the horizontal shaft 41 is rotated by a worm wheel 42 that meshes with the worm 43. Also,
The vertical shaft 45 has gear plates 48 and 49 connected to the upper part thereof, which rotate the vertical shaft 45 several times through the teeth of the gear during one revolution of the horizontal shaft 41. A cam plate 50 is disposed at the protruding lower end to press the cam peripheral surface (lead curved surface) against the trochanter 51. In order to press the cam plate 50 against the trochanter 51, a constant pressure pressing cylinder 52 or a spring that urges the oscillating base 22 itself in the direction of the trochanter 51 is attached to the oscillating base 22 on the base 1 or other fixed portion. It goes without saying that it can be placed in between. A cutter blade 53 that moves at low speed in the direction of the generatrix of the gear material M is provided on a swing surface portion including the axis of the gear material M held in the holding cylinder .

In addition, in the figure, 21 indicates a bearing.

Next, the operation of this embodiment will be explained.

Fix the gear material M to the tip of the holding tube 34, and turn the adjustment knob 3.
2, the conical apex partner part of the gear material M aligns with the support shaft 2.
Adjust the movement of the holding mechanism support member 24 on the swing base 22 so that it coincides with the extension line of the center of the bag, and rotate the gripper 33 to move the rotary swing mechanism support member 27 and move the holding table 16. Move with Mommami 20 and move to trochanter 51
and the axis of the cam plate 50 at a desired position.

Next, adjust the height and position so that the tip of the cutter blade 53 rotating at high speed passes through the conical apex of the gear material M, and adjust the swing base 22 to the swing end position farthest from the cutter blade 53. , the fixed base 5 is adjusted and fixed at a rotational position relative to the base 1 by operating the adjusting knob 14 so that the conical generatrix of the gear material M coincides with the locus of movement of the cutter blade 53. After these position adjustments are completed, the cutter blade 53 is rotated and gradually moved in the direction of the generatrix of the gear material M, and when the electric motor 47 is started, the horizontal shaft 41 or the gear material M rotates at a low speed while moving the cam plate 50. As a result, the cutter blade 53 swings toward and away from the cutter blade 53, and a number of teeth corresponding to the ratio of the rotation speeds of the cam plate 50 and the horizontal shaft 41 move from one end of the gear material M to the other end of the cutter blade 53. It is formed gradually as it is fed.
Since the present invention has the above-described structure and operation, if the lead surface of the cam plate 50 is shaped to correspond to the desired tooth profile of the gear, "the gear material M will swing several times during one rotation," By moving the cutter blade, it is possible to continuously form a tooth profile from one end (large diameter end) to the other end (small diameter end).In particular, the present invention is designed to fix the tooth profile on the base 1 with adjustable rotational position. Since the base 5 is disposed, it is easy to match the movement locus of the cutting edge of the cutter blade 53 with the conical generatrix of the gear material M by simply adjusting the rotational position of the fixed base 5. Even in the case of a cage gear, it is possible to easily set the gear material and cut the gears.Furthermore, in the present invention, the swinging base 22 is swung by the trochanter 51 and the cam plate 50, and the support shaft 2 is used as the swiveling shaft. Therefore, accurate rocking that matches the desired tooth profile can be performed only by forming the lead surface of the cam plate 50, and this trochanter 5
Since the distance between the support shaft 2 and the cam plate 50 can be adjusted, the tooth profile of the bevel gear can be accurately set by adjusting both.

The distance from this support shaft 2 to the trochanter 51 and the cam plate 60 (more precisely, the tangent line between them) depends on the extent to which the lead surface of the cam plate 50 is eccentric from the central axis of the cam plate 50. In order to obtain a reference tooth profile, the mutual relationship between the two must be set accurately.In addition, when cutting various bevel gears using different cam plates 58, The distance from the support shaft 2 must be selected according to the distance, and the present invention allows this selection to be made easily and reliably.Also, in the present invention, the distance from the support shaft 2 to the holding cylinder 34 can also be adjusted. Because of this, it is easy to align the portion corresponding to the apex of the gear material M on the rattan line of the support shaft 2, and furthermore,
The cam plate 50G is arranged further rearward of the holding cylinder 34, and the distance to the support shaft 2 can be adjusted separately from the holding register 34, so that the cam plate 50, which serves as the swing reference part, The lead can be set larger than the actual distance between the tooth tip and root surface of the gear, allowing very accurate gear cutting.

[Brief explanation of drawings]

The drawings show an embodiment of a gear cutting device for a bevel gear according to the present invention, in which Fig. 1 is a plan view, Fig. 2 is an enlarged vertical front view, and Fig. 3 is a view taken along line X-X in Fig. 2. 4 is a sectional view taken along line Y-Y in FIG. 2, FIG. 5 is a sectional view taken along line Z-Z in FIG. 2,
Figure 6 is a vertical small cross-sectional plan view taken along the line W-W in Figure 2. Figure 7 is a cross-sectional view of the drive mechanism. 1 - Base, 2 - Support shaft, 5 - Fixed base, 22 - Swing base. , 24-holding mechanism support material, 27-rotation swing mechanism support material, 34-holding cylinder, 40-key connecting portion, 41-horizontal shaft,
45 ~ Vertical shaft, 47 ~ Electric motor, 48, 49 ~ Gear plate, 5
0 - cam plate, 51 - trochanter, 53 - cutter blade. Spear f diagram N Fuo 3 diagram Ga 4 spear 5 diagram O 6 diagram Ga diagram

Claims (1)

[Claims] 1 A support shaft 2 is erected on a base 1, and a fixing member is provided on the base 1 that can rotate around the axis of the support shaft 2 and can be fixed to the base 1 by adjusting the rotation position as appropriate. A base 5 is disposed, a trochanter 51 whose distance from the support shaft 2 can be adjusted is disposed on the fixed base 5, and above the fixed base 5,
A swing base 22 pivotally attached to the support shaft 2 is arranged, and on the swing base 22 there is a holding mechanism support member 24 for the gear material M, and a support member 24 for the gear material M to be rotated and the swing base 22
Rotating and swinging mechanism support members 27 for swinging the gears are arranged such that the distance from the support shaft 2 can be adjusted, and the holding mechanism support member 24 has a gear material M at its tip supported by an extension of its axis. A holding cylinder 34 that holds the shaft 2 so as to be perpendicular to the extension of the axis is rotatably arranged around the extension of the axis of the gear material M as a rotation axis. horizontal axis 41 and vertical axis 4 rotated by
5, the horizontal shaft 41 is located concentrically with the holding cylinder 34, and its tip is removably connected to the rear end of the holding cylinder 34 by a key connecting part 40, and the vertical shaft 45 is located at the upper part. Gear plates 48 and 49 are connected to the vertical shaft 45, which rotate the gear teeth several times during one revolution of the horizontal shaft 41, and a cam is attached to the lower end of the vertical shaft 45, which extends below the swing base 22. A cam plate 50 is arranged whose circumferential surface is in pressure contact with the trochanter 51, and a cutter blade 53 that moves at low speed in the generatrix direction of the gear material M is provided on the swinging surface portion including the axis of the gear material M. Bevel gear gear cutting device.