JP2850638B2 - 3-piece type coupling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a turret for a lathe,
It is applied to turning tables in machining centers, etc.
The present invention relates to a three-piece type coupling device for clamping an indexing rotating member at an indexing position.

[0002]

2. Description of the Related Art In a turret indexing device for a lathe, a mechanism for clamping a turret by a meshing coupling at an indexing position is generally used in order to increase the support rigidity of a tool. Also, in a machining center, a meshing coupling is used to clamp a pallet mounting swivel table at an indexing position.

FIG. 4 shows an example of a turret indexing device for a lathe. The turret 51 is attached to the tip of a turret shaft 53 rotatably and axially movably supported on the support base 52. A two-piece type carbic coupling is provided between the tip of the cylindrical portion 52a of the support base 52 and the turret 51. A fixed coupling member 54a and a rotary coupling member 54b constituting the 54 are provided. After the indexing rotation, the turret 51 is slightly moved toward the distal end side (in the direction of arrow a) by a clamp cylinder (not shown) installed on the support base 52, so that the turret 51 is clamped into an engaged state by the carbic coupling 54. Is done.

FIG. 5 shows an example of a turning table indexing device in a machining center. The swivel table 55 is a base
It is rotatably mounted on 56 by a bearing 63 and is indexed and rotated by an indexing motor (not shown) via a gear 62. Between the turning table 55 and the base 56, a fixed coupling member 57a fixed to the base 56, a rotary coupling member 57b fixed to the turning table 55, and both coupling members 57a.
intermediate coupling member 57c meshing over a and 57b
A three-piece type carbic coupling 57 is provided.

[0005] The intermediate coupling member 57c is attached to a ring-shaped member 58 provided on the outer periphery of the guide tube portion 56a of the base 56 so as to be able to move up and down. The first hydraulic cylinder 59, in which a clamp-side oil chamber 59a and an unclamping-side oil chamber 59b are formed, drives up and down for engagement. Also, the base
A second hydraulic cylinder 61, which presses down the turning table 55 in the direction of arrow b with the ring-shaped piston 60 to ensure the engagement between the rotary coupling member 57b and the intermediate coupling member 57c, is provided between the turning table 56 and the turning table 55. Is provided. In this way, the turning table 55 is clamped at the indexing position by engaging the intermediate coupling member 57c over both the fixed coupling member 57a and the rotary coupling member 57b.

[0006]

In the prior art shown in FIG. 4, since a two-piece type coupling 54 is used, only one hydraulic cylinder is required for engaging and disengaging the coupling 54, and the structure of the hydraulic path is reduced. Is easy. However, the entire turret 51 serving as the indexing rotary member must be moved back and forth for clamping, which causes a problem that the structure of the clamp cylinder and the like becomes large.

In the conventional example shown in FIG. 5, since the three-piece coupling 57 is used, there is no need to raise and lower the swivel table 55 for engaging and disengaging the coupling 57, so that a compact structure is obtained. However, this three-piece coupling 57
In this case, the intermediate coupling member 57c is fixed to the fixed coupling member 57a and the rotating coupling member 57 during unclamping.
Since both are completely disengaged from each other, it is necessary to engage both the fixed coupling member 57a and the rotary coupling member 57b again at the time of clamping. For this reason, there is a possibility that a poor meshing may occur at the time of clamping depending on assembling accuracy and the like. For example, there is a case where the tooth tip of the intermediate coupling member 57c is not bitten while being kept in contact with the tooth tip of the fixed coupling member 57a or the rotary coupling member 57b.

SUMMARY OF THE INVENTION An object of the present invention is to provide a three-piece meshing coupling device which can be formed compactly with less occurrence of poor meshing.

[0009]

SUMMARY OF THE INVENTION A coupling device according to the present invention is of a three-piece type comprising a fixed coupling member, a rotating coupling member, and an intermediate coupling member. The fixed coupling member and the rotary coupling member are formed in a ring shape concentric with each other, and are attached to the fixed member and the rotary member, respectively. The intermediate coupling member meshes with both coupling members, and is provided so as to be movable in the axial direction. The height of engagement of the intermediate coupling member with the fixed coupling member is different from the height of engagement of the intermediate coupling member with the rotary coupling member. Further, the intermediate coupling member
At the axially moving end, the fixed coupling member
And one of the rotary coupling members
Engaged, but disengaged from the other coupling member
It is configured to be in a state.

[0010]

According to this structure, when the intermediate coupling member is disengaged, only the lower coupling member of the fixed coupling member and the rotary coupling member is disengaged, The meshing is maintained with the coupling member having the higher meshing height. In this state, the rotation of the rotary member is performed, and the engagement of the intermediate coupling member is performed again at a desired index angle. At this time, since the intermediate coupling member is in a state of maintaining engagement with one of the rotating and fixed coupling members, it is sufficient to engage only the other coupling member, so that poor engagement hardly occurs. The intermediate coupling member is an example
For example, at the axial movement end that abuts the inner surface of the fixed member.
The fixed coupling member and the rotary coupling member
Meshes with one coupling member of
The meshing member is disengaged from the
Special mechanism for positioning the pulling member in this state
And the configuration is simple.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. This example is applied to a turret device of a lathe. The turret 1 is fixed to the tip of an indexing shaft 2 composed of a hollow shaft, and the indexing shaft 2 is rotatably supported by a support 4 via a bearing 3. The turret 1 and the indexing shaft 2 constitute an indexing rotary member 5. The support base 4 is composed of a turret carriage installed on a bed (not shown) so as to be able to move forward and backward, and has an index motor (not shown) for rotating the indexing shaft 2 mounted thereon.

A portion near the turret of the support base 4 is a cylindrical portion 4a, and a mating coupling 6 composed of a three-piece type carbic coupling is provided between the tip of the cylindrical portion 4a and the turret 1. The coupling 6 is a fixed coupling member 7 bolted to the cylindrical portion 4 a of the support base 4.
And a rotary coupling member 8 bolted to the turret 1 and an intermediate coupling member 9 meshing face-to-face with both coupling members 7 and 8. Each of the coupling members 7 to 9 is formed of a ring-shaped member that is concentric with the center O of the turret 1, and each of the coupling members 7 to 9 is provided so as to protrude in the circumferential direction.

The meshing height of the intermediate coupling member 9 with respect to the fixed coupling member 7 and the meshing height with the rotary coupling member 8 are different from each other. That is, here, the tip of the rotary coupling member 8 with respect to the tip of the intermediate coupling member 9 is slightly shifted from the tip of the fixed coupling member 7 to the front side (the right side in the figure) of the turret 1. Even if the intermediate coupling member 9 is disengaged from the rotary coupling member 8 during unclamping, the engaged state with the fixed coupling member 7 is maintained.

The intermediate coupling member 9 is a hydraulic cylinder
It is bolted to 10 ring-shaped pistons 11. The hydraulic cylinder 10 has a ring-shaped piston 11 movably fitted in a cylinder chamber formed between an indexing rotary member 5 composed of a turret 1 and an indexing shaft 2 and a support table 4 so as to be movable in the axial direction. is there. A clamp-side hydraulic port 17 provided on the support base 4 communicates with the clamp-side oil chamber 12 in the cylinder chamber. A plurality of communication holes 15 provided radially from a circumferential groove 14 on the outer periphery of the ring-shaped piston 11 are opened in the unclamping-side oil chamber 13 in the cylinder chamber, and the circumferential groove 14 4 communicates with an unclamping-side hydraulic port 16 provided in the apparatus.

The operation of the above configuration will be described. After indexing the turret 1 to a desired angle, hydraulic pressure is supplied to the clamp-side oil chamber 12 of the hydraulic cylinder 10 to clamp the coupling 6. That is, the ring-shaped piston 11 is
And the intermediate coupling member 9 is engaged with the fixed coupling member 7 and the rotary coupling member 8 (the state of FIGS. 1 and 2A).

When the turret 1 is to be indexed and rotated, oil pressure is supplied to the unclamping-side oil chamber 13 of the hydraulic cylinder 10, and the engagement coupling 6 is unclamped as shown in FIG. At this time, since the engagement height of the fixed coupling member 7 with respect to the intermediate coupling member 9 and the engagement height of the rotary coupling member 8 are different as described above, the intermediate coupling member with respect to the rotary coupling member 8 is different. 9, the fixed coupling member 7 is disengaged.
Is still maintained.

For this reason, from this unclamped state, FIG.
The transition to the clamp state shown in (A) is completed only by the intermediate coupling member 9 meshing with the rotary coupling member 8. Conversely, the unclamping operation is completed only by releasing the engagement of the intermediate coupling member 9 with the rotary coupling member 8. Therefore, the occurrence of poor engagement of the coupling members 7 to 9 during the clamping operation is reduced, and the engagement and disengagement time of the coupling members 7 to 9 can be reduced.

In the above embodiment, the positions of the tooth tips of the fixed coupling member 7 and the rotary coupling member 8 are different from each other. However, as shown in FIG.
8, the tip height of the intermediate coupling member 9 is set to be the same, and the tip portion 9a facing the fixed coupling member 7 and the tip portion 9a facing the rotary coupling member 8 are set.
b.

In the above embodiments, the engagement height on the fixed coupling member 7 side is increased, but the engagement height on the rotary coupling member 8 side may be increased. In that case,
The intermediate coupling member 9 is rotated together with the rotary coupling member 8. Further, each of the above embodiments has been described with respect to a case where the present invention is applied to a turret lathe. However, the present invention is generally applied to a coupling device of the turning table 55 shown in FIG. be able to.

[0020]

According to the three-piece meshing coupling device of the present invention, since the meshing height of the intermediate coupling member with respect to the fixed coupling member and the meshing height with respect to the rotary coupling member are made different, the rotation during unclamping is performed. Alternatively, the engagement of the intermediate coupling member with one of the fixed coupling members can be maintained.
Therefore, although it is a three-piece type coupling device that can be configured more compactly than a two-piece type, it is only necessary to engage the intermediate coupling member with one coupling member at the time of the clamping operation, and the occurrence of poor engagement occurs. Is halved. The intermediate coupling member is moved in the axial direction.
At the moving end, the fixed coupling member and the rotating cup
Engage with one coupling member of the ring member and the other
Will be in a state of disengagement with the coupling member
To position the intermediate coupling member in this state.
No special mechanism is required and the configuration is simple.

[Brief description of the drawings]

FIG. 1 is a half sectional view of a turret portion of a lathe provided with a three-piece type coupling device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of the operation.

FIG. 3 is a partial cross-sectional view illustrating a meshing coupling device according to another embodiment.

FIG. 4 is a partial sectional view of a conventional turret lathe.

FIG. 5 is a half sectional view of an indexing device portion of a conventional swivel table.

[Description of Signs] 1 ... turret, 2 ... index shaft, 4 ... support base, 5 ... index rotating member, 6 ... 3-piece type coupling, 7 ... fixed coupling member, 8 ... rotary coupling member , 9: Intermediate coupling member, 10: Hydraulic cylinder, 11: Ring-shaped piston, 12: Clamp side oil chamber, 13: Unclamp side oil chamber

Claims (2)

(57) [Claims] 1. A fixed coupling member and a rotating coupling member formed in a concentric ring shape and attached to a fixed member and a rotating member, respectively, and an axially movable intermediate coupling member meshing over both coupling members. A three-piece meshing coupling device, wherein the meshing height of the intermediate coupling member with respect to the fixed coupling member and the meshing height with the rotary coupling member are different. 2. The intermediate coupling member has an axial displacement.
At the moving end, the fixed coupling member and the rotating cup
Engage with one coupling member of the ring member and the other
So that it can be disengaged from the coupling member
3. The three-piece mating coupling according to claim 1, wherein the coupling comprises:
Device.