JPH0117813B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a helical guide for a gear shaper that uses a pinion cutter to manufacture a helical gear for power transmission.

[Conventional technology]

Helical gears are usually cut by a gear shaper, and an example of a conventional gear shaper equipped with a helical guide is shown in FIG.

In the figure, 1 is a housing, 2 is a rotary motor installed in the housing 1, and 3 is a power transmission mechanism, which is composed of a V-belt pulley 4, a V-belt 5, a V-belt pulley 6, and a rotation transmission shaft 7. ing. 8 also transmits the rotation of the rotation transmission shaft 7 to the lifting shaft 9.
10 is a cutter spindle disposed at the bottom of the lifting shaft 9; 11 is a cutter mounting shaft with a pinion cutter 12 attached to the lower end; 13 is a mechanism for converting the cutter spindle 10 and the pinion cutter 11 into vertical reciprocating motion; This is a helical guide for giving a constant rotation corresponding to the lead of the pinion cutter 11.

[Problem to be solved by the invention]

However, the helical guide 13 changes every time the lead of the pinion cutter for helical gear processing changes.
The guide groove lead must be changed. This is because it was customary to prepare and manufacture a dedicated helical guide 13 for each workpiece. For this reason, when manufacturing helical gears with different twist angles, it was necessary to replace the helical guide 13 every time the specifications changed. However, such replacement work takes a considerable amount of time and is technically difficult, leading to a decrease in the efficiency of gear manufacturing work.

In particular, in recent years, the production of helical gears used in automobile transmissions, etc., has started using FMS, which allows the type and quantity to be changed in response to needs.
(Flexible manufacturing system). With such advances in technology, I wonder if it will be necessary to replace the helical guide.
It was not possible to adequately respond to FMS.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to enable a plurality of helical gears having different helical angles to be easily manufactured without replacing helical guides.

[Means to solve the problem]

In order to achieve the above object, the helical guide structure of the present invention includes a helical guide to which a cutter mounting shaft is integrally fixed, and a guide case in which the helical guide is attached so as to be movable up and down and rotatable, A plurality of engagement protrusions are provided on the outer circumferential surface of the helical guide, and the engagement protrusions are inclined with respect to the axis and formed in a substantially spiral shape, and these engagement protrusions are divided into a plurality of groups each having a different twist angle, Block mounting openings are opened in the peripheral wall of the guide case in a radial direction so as to face each of the plurality of engagement protrusions, and one lead setting moving block is radially provided in each block mounting opening. An inclined groove is formed on the inner circumferential surface of each lead setting moving block so as to be movable back and forth, and has a torsion angle that matches each of the engagement protrusions having different torsion angles, and in which the engagement protrusion can slide. The structure is characterized in that the lead setting moving block is connected to a mechanism for selectively driving a set of inclined grooves having a common helical angle forward and backward in the helical guide direction.

〔Example〕

Hereinafter, features of the present invention will be specifically explained with reference to embodiments shown in the drawings.

FIG. 1 is a vertical sectional view showing the main parts of the helical guide structure of the present invention, and FIGS.
FIG. 2 is a plan view taken in the direction of the - line arrow and a cross-sectional view taken in the - line arrow direction in the figure.

FIG. 1 shows the overall structure of a pinion cutter lifting/rotating mechanism, in which a cutter head 20 is fixed to a machine frame 1 of a gear shaping machine shown in FIG. 13. A rotation support cylinder 21 for rotating the pinion cutter 12 in conjunction with the rotation of the gear to be cut is rotatably housed inside the cutter head 20. A worm wheel 22 is provided on the outer periphery of the rotary support cylinder 21, and transmits rotational force by meshing with a master worm (not shown). Note that 23 is a cover provided on the top of the cutter head 20.

Furthermore, a guide case 24 is fixed inside the rotation support cylinder 21 for giving rotation to the pinion cutter 12 which is interlocked with the elevating shaft 9. A helical guide 25 that can be moved up and down and rotated is housed inside the guide case 24, and a cutter spindle 10 is inserted and fixed into the helical guide 25. Note that 26 is a ball joint that allows the helical guide 25 to rotate relative to the elevating shaft 9 so that it can be raised and lowered integrally.

In addition to the above basic configuration, a configuration is provided that allows gear cutting to be performed without replacing the helical guide 25 even if the torsion angle of each gear to be machined is different. This configuration will be explained in detail with reference to FIGS. 4 to 12.

FIG. 4 is a partially developed view of the guide case 24 as seen from the inner circumferential side, FIG. 5 is a plan view, FIG. 6 is a longitudinal cross-sectional view, and FIG. 7 is a developed view of the entire inner circumferential surface.

As shown in FIGS. 6 and 7, a total of six block mounting openings 27, 28, and 29 are opened in the lower peripheral wall of the guide case 24 in the radial direction. These block mounting openings 27 to 29 are
It is formed with a pitch equal to the peripheral wall of the guide case 24. And each block mounting opening 27-29
As shown in FIG. 4, lead setting movable blocks 30, 31, and 32 are arranged so as to be movable radially relative to the guide case 24.

The block mounting openings 27, 28, and 29 are inclined at different angles with respect to the axis of the guide case 24, respectively. That is, as shown in FIG. 7, these block mounting openings 27 to 29 have inclination angles α1, α2, and α3 with respect to the axis of the guide case 24, respectively. Then, the block mounting opening 27-2
In the inner circumferential surface of each of the lead setting moving blocks 30 to 32 housed in the lead setting movement blocks 9, inclined grooves 34, 35, and 36 whose axes are equal to the inclinations of the housed block mounting openings 27 to 29 are formed. (Figure 3). Furthermore, lead setting blocks 30 to 32
A recess is provided in the radially outer portion of the support pin 37 into which the support pin 37 is fitted. This support pin 37
has a proximal end fixed to the rotary support tube 21 and protrudes toward the helical guide 25, and has a structure that fits into the recess and can be slid relative to the lead setting blocks 30 to 32. Have it. and,
A recess into which the support pin 37 fits into the lead setting block 30 is formed as a pressure oil chamber 38.

On the other hand, three annular grooves 40, 41, and 42 are provided on the upper outer peripheral surface of the guide case 24 at regular intervals. These annular grooves 40,4
1 and 42 are connected to pressure oil chambers 38 of lead setting blocks 30, 31, and 32 via passages 44, respectively. And these annular grooves 40 to 42
is the main pressure oil supply pipe 4 formed on the inner surface of the cover 23.
It is selectively connected to 5. The flow path connection between the annular grooves 40 to 42 and the main pressure oil supply pipe 45 is selected by programming by switching an electromagnetic solenoid valve (not shown). With this configuration, when the pressure oil supply pipe 45 is connected to the pressure oil chamber 38 of the arbitrarily selected lead setting block, 3
Only one set of lead setting blocks selected from among the seed lead setting moving blocks 30 to 31 can be advanced toward the helical guide 24. In addition, in FIG. 3, when 46 is engaged,
This is a spring for holding the lead setting block 30 etc. in the retracted position.

Further, on the circumferential surface of the helical guide 25, there are inclined grooves 34 to 34 of each lead setting moving block 30 to 31.
Engagement protrusions 50, 51, 52 that enter into 36 are provided. These engaging protrusions 50 to 52 are formed to be inclined with respect to the axis, as shown in the plan view of the helical guide 25 in FIG. FIG. 10 is a developed view of the outer peripheral surface of the helical guide 25. As mentioned above, the engaging protrusions 50 to 52 are inclined with respect to the axis, and the respective inclination angles correspond to the lead setting moving blocks 30 to 32. is equal to the inclination angle of the engaging grooves 34 to 36.

A gear shaping operation using a gear shaping machine having the helical guide structure configured as described above will be explained below.

First, as shown in FIG. 1, the pinion cutter 12 is attached to the lower end of the cutter attachment shaft 10. Further, among the lead setting moving blocks 30 to 32, those having inclined grooves 34 to 36 having an inclination angle corresponding to the lead of the pinion cutter 12 to be used are selected. After this selection, one of the lead setting moving blocks 30 to 32 is attached to the helical guide 25.
Pressure oil is supplied into the pressure oil chamber 38 so as to advance toward the pressure oil chamber 38. For example, in FIG. 3, the lead setting block 32 is selected, pushed out in the direction of the helical guide 25 using pressure oil, and the inclined groove 36 provided on the inner peripheral surface of the lead setting block 32 is inserted into the engagement protrusion 52 of the helical guide 25.
is engaged with. Of course, the inclined grooves 36 and the engagement protrusions 52 have the same inclination angle,
The helical guide 25 moves up and down within the guide case 24 while rotating in accordance with the lead angle of the gear cutter.

Thereafter, the master worm is rotationally driven, and the rotation support cylinder 21 and the guide case 24, helical guide 25, cutter spindle 10, cutter mounting shaft 11, and pinion cutter 12 disposed inside the rotary support tube 21 are rotated through the worm wheel 22. It rotates at a low speed in conjunction with the rotation of the gear to be machined.
Moreover, if the rotary motor 2 (FIG. 13) is driven at the same time, the helical guide 25 is reciprocated in the vertical direction via the elevating shaft 9. By such an operation, the pinion cutter 12 reciprocates while rotating at a constant angle, and the gear of the tooth surface having a helix angle corresponding to the lead angle is cut.

On the other hand, when cutting gears with different helix angles, there is no need to replace the helical guide 25 and guide case 24. That is, by selecting the lead setting moving block with the inclined groove corresponding to the lead of the pinion cutter to be used, the inclined grooves 34, 35 and the engagement protrusion 50,
Gears can be cut by each combination of 51.

In the illustrated embodiment, three sets of lead setting moving blocks 30 to 32 and engaging protrusions 50 to 52 are provided.
Therefore, there are three types that can accommodate changes in lead angle.

〔Effect of the invention〕

As explained above, in the helical guide structure of the present invention, the helical guide and the guide case are connected so that the turning angle of the pinion cutter can be changed according to the lead angle of the gear to be cut. There is. Therefore, gear cutting of multiple gears with different helix angles can be performed without replacing the helical guide, making it possible to improve gear machining efficiency.
It can also be suitably used for high-mix, low-volume production.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional front view of a pinion cutter lifting/rotating mechanism incorporating the helical guide mechanism of the present invention;
Figure 2 is a cross-sectional view taken along the - line in Figure 1;
The figures are also a cross-sectional view along the - line, Figure 4 is a developed view of the guide case with a built-in helical guide, Figure 5 is a plan view of the same, Figure 6 is a cross-sectional front view of the guide case, and Figure 7 is a cross-sectional view of the guide case. Fig. 8 is a plan view of the helical guide, Fig. 9 is a cross-sectional side view of the same, Fig. 10 is an exploded view of the same, Fig. 11 is a front view of the lead setting block, and Fig. 12 is a plan view of the helical guide. 1st
1 is a sectional view taken along the line in FIG. 1, and FIG. 13 is a sectional front view of a gear shaper having a conventional helical guide. 20: Cut head, 21: Rotation support tube, 2
2: Worm wheel, 23: Cover, 24: Guide case, 25: Helical guide, 26: Ball joint, 27, 28, 29: Opening for block installation, 30, 31, 32: Moving block for lead setting, 34, 35, 36: Inclined groove, 37: Support pin, 38: Pressure oil chamber, 40, 41, 42: Annular groove, 44: Passage, 45: Pressure oil supply pipe, 46: Spring, 50, 51, 52: Engagement Projection.

Claims (1)

[Scope of Claims] 1. A helical guide to which a cutter mounting shaft is integrally fixed, and a guide case in which the helical guide is mounted so as to be movable up and down and rotatable; A plurality of engagement protrusions are provided that are inclined toward the guide case and formed in a substantially spiral shape, and these engagement protrusions are divided into a plurality of groups each having a different twist angle, and the plurality of engagement protrusions are provided on the peripheral wall of the guide case. Block mounting openings are opened in the radial direction opposite to each of the engaging protrusions, and one lead setting moving block is provided in each block mounting opening so that it can move forward and backward in the radial direction. forming on the inner circumferential surface of the block an inclined groove having a torsion angle that matches each of the engagement protrusions having different twist angles and in which the engagement protrusion can slide; A helical guide structure for a gear shaper, characterized in that a set of inclined grooves having a common helix angle is connected to a mechanism for selectively driving the set forward and backward in the helical guide direction.