JP4075563B2 - Work clamping mechanism - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pulley clamping mechanism when a rotor is press-fitted into a pulley.
[0002]
[Prior art]
In order to suppress the amount of vibration of the pulley when the rotor is press-fitted into the pulley, the pulley is forcibly clamped for centripetal operation. That is, as shown in FIG. 1, the rotor B is held in a state of being centered on the work receiving jig A into which the pulley 1 is inserted. Next, the clamp claw 4 of the clamp mechanism C moves forward from the left and right to pinch the pulley 1. While the pulley 1 is clamped, the press-fitting punch D is lowered and the work receiving jig A is lowered while pressing the rotor B, so that the rotor B is press-fitted into the pulley 1.
[0003]
In this case, as the clamp claw 4 of the clamp mechanism C of the prior art, as shown in FIG. 2A, a clamp claw that is formed in a claw shape matching the V groove shape of the pulley 1 is used. In FIG. 2A, the clamp claw 4 slides back and forth between the upper cover 2 and the base 3.
[0004]
However, in this prior art clamping mechanism, the centering of the pulley 1 is possible if the clamp claw dimension and the pulley dimension (shape) are the same, but the pulley dimension varies depending on the manufacturing lot difference. Therefore, if the pulley size is larger than the clamp claw size, there will be a load on the pulley during clamping, and if the pulley size is small, there will be a gap and the amount of deflection will increase when press-fitted. It corresponds by setting up.
[0005]
[Problems to be solved by the invention]
The present invention has been made in view of the above problems, and the object thereof is to press-fitting the rotor into the pulley without any need for a clamping jig for each pulley and without having to make adjustments for each lot. It is an object of the present invention to provide a pulley clamping mechanism that enables the above.
[0006]
[Means for Solving the Problems]
The present invention provides a pulley clamping mechanism according to each of the claims as means for solving the problems.
Clamping mechanism of the pulley according to claim 1, the clamp jaws to slide back and forth so that projects into the V-groove of the pulley have a number in a circle, the number of clamp jaws are each standard clamp It consists of a claw and a centripetal claw that is urged to protrude forward relative to the reference clamp claw and can slide back and forth, and the tip of the reference clamp claw and the tip of the centripetal claw have substantially the same cross-sectional mountain shape The tip of the reference clamp claw and the centripetal claw are arranged side by side in the axial direction so that the mountain shape is continuous, and when the reference clamp claw advances and clamps the pulley, the centripetal claw moves into the groove of the pulley. Depending on the shape, the reference clamp claw and the centripetal claw are brought into close contact with the respective surfaces of the V-groove where the reference clamp claw and the centripetal claw enter, so that the centripetal operation and the clamping are performed simultaneously. you shall Yes, even if the pulley product size varies, when the reference clamp claw moves forward and clamps the pulley, the centripetal claw moves back and forth with respect to the reference clamp claw so that the reference clamp claw moves to the pulley. It can be adhered. Therefore, the clearance between the pulley and the clamp claw is eliminated, and the shake at the time of press-fitting can be prevented. Further, since the tip of the reference clamp claw and the tip of the centripetal claw have substantially the same cross-sectional mountain shape, each of the reference clamp claw and the centripetal claw on each surface of the V groove where the reference clamp claw and the centripetal claw of the pulley enter. Can be firmly attached to each other, and centripetal and clamping can be performed simultaneously.
[0007]
The clamping mechanism according to claim 2, in which centering pawl has identified that it is biased Ri by the coil spring.
The clamp mechanism according to claim 3 defines that the clamp claws are simultaneously driven by a single drive mechanism.
[0008]
The clamp mechanism according to claim 4 is a drive in which a single drive mechanism is directly coupled to a servo motor and meshed with a cam gear, an upper cover made of an annular flat plate, an annular cam gear having teeth formed on the outer periphery thereof A number of clamp claws are arranged between the upper cover and the cam gear, and the cam follower is attached to the lower part of the rear part of the reference clamp claw. Then, the cam follower is advanced along the cam groove by the cam grooves engaged with the cam followers, respectively, so that the clamp pawls are simultaneously advanced toward the center direction. In this way, the rotational force of the servo motor is simultaneously converted into the thrust of the clamp pawl and the rotation amount is simultaneously converted into the movement amount of the clamp pawl.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a pulley clamping mechanism according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram schematically illustrating a method for press-fitting a rotor into a pulley. That is, the workpiece receiving jig A has a cylindrical portion A1 that receives the pulley 1 and a protruding portion A2 that receives the rotor B on the same axis. In a state where the pulley 1 and the rotor B are received by the workpiece receiving jig A, the clamp mechanism C is operated to clamp the pulley 1 from the left and right or from the circumferential direction. In this state, the press-fitting punch D is lowered, the rotor B and the work receiving jig A are pressed down, and the rotor B is press-fitted into the pulley 1.
[0010]
The structure of the clamp claw 4 of the clamp mechanism C is shown in FIG. FIG. 2A shows a state in which the pulley 1 is clamped by using a clamp claw 4 having a conventional structure. In the clamp claw 4 having the conventional structure, two protrusions 4a having a cross-sectional mountain shape that substantially conforms to the shape of the groove 1a of the pulley 1 are formed continuously at the tip. These protrusions 4 a enter the groove 1 a of the pulley 1 to clamp the pulley 1. However, in this clamp claw 4, a gap is generated between the pulley 1 and the clamp claw 4 due to a variation in the dimensions of the pulley 1 (a variation in the groove shape), and there is a possibility that a vibration corresponding to the gap occurs during press-fitting.
[0011]
Therefore, in the embodiment of the present invention, as shown in FIG. 2B, the clamp claw 4 has a divided structure of the reference clamp claw 6 and the centripetal claw 7. The front end 6a of the reference clamp claw 6 is formed in a cross-sectional mountain shape, and the front end 7a of the centripetal claw 7 is also formed in a cross-sectional mountain shape. The reference clamp claw 6 and the centripetal claw 7 are disposed in contact with each other so that the mountain shapes of the tips 6a and 7a are continuous. Further, the centripetal claw 7 is disposed so as to be slidable in the front-rear direction with respect to the reference clamp claw 6, and a coil spring 5 is interposed between the centripetal claw 7 and the reference clamp claw 6 to urge the centripetal claw 7. ing.
Further, a means 7b for restricting the movement of the centripetal claw 7 is provided so that the centripetal claw 7 does not protrude beyond the reference clamp claw 6.
[0012]
The clamp claw 4 composed of the reference clamp claw 6 and the centripetal claw 7 is disposed between the upper cover 2 and the base 3 so as to be slidable in the front-rear direction, similarly to the clamp claw having a conventional structure. The clamp claw 4 is driven by an appropriate drive mechanism (not shown).
[0013]
One example of the drive mechanism of the clamp pawl 4 is shown in FIG.
FIG. 3 is a partial cross-sectional perspective view of a clamp mechanism C according to one embodiment. In the clamp mechanism C, the upper cover 2 is an annular flat plate, and the base 3 is an annular cam gear 9 having teeth formed on the outer periphery. A large number of clamp claws 4 are arranged on the circumference between the upper cover 2 and the cam gear 9. The clamp claw 4 includes the reference clamp claw 6 and the centripetal claw 7 as described above. A pin-shaped cam follower 8 is attached below the rear portion of the reference clamp claw 6. This cam follower 8 is engaged and restrained by the same number of cam grooves 9a as the number of clamp claws 4 formed in the cam gear 9 at a fixed angle.
[0014]
A drive gear 11 directly connected to the servo motor 10 meshes with the cam gear 9. Therefore, the rotation of the servo motor 10 in a specific direction causes the cam follower 8 to advance along the cam groove 9a and advance the clamp claws 4 (6, 7) in the center direction. Further, the clamp claws 4 (6, 7) can be moved backward by rotating the servo motor 10 in the reverse direction. Thus, the cam gear 9 receives the rotation of the servo motor 10 and simultaneously converts the rotational force into the thrust of the clamp claw 4 and the rotation amount into the movement amount of the clamp claw 4 by the cam groove 9a.
[0015]
In the clamp claw 4 (6, 7) of the present invention configured as described above, when the reference clamp claw 6 moves forward and clamps the pulley 1, the centripetal claw 7 varies in product dimensions of the pulley 1 (groove shape). The reference clamp claw 6 can be brought into close contact with the groove 1a of the pulley 1 without forming a gap. Therefore, centripetalization and clamping are performed simultaneously.
In this way, in the present invention, a dedicated clamping claw that is required in the prior art becomes unnecessary, and products with different pulley diameters and pulley shapes can be handled with a single clamping jig.
[Brief description of the drawings]
FIG. 1 is a diagram schematically illustrating a method for press-fitting a rotor into a pulley.
FIGS. 2A and 2B are diagrams illustrating a pulley clamped state using a clamp pawl having a conventional structure, and FIG. 2B are diagrams illustrating a pulley clamped state using a clamp pawl according to an embodiment of the present invention. is there.
FIG. 3 is a partial cross-sectional perspective view of a clamp mechanism in which clamp claws according to an embodiment of the present invention are arranged on the circumference.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Pulley 2 ... Upper cover 3 ... Base 4 ... Clamping claw 5 ... Coil spring 6 ... Reference | standard clamp claw 7 ... Centripetal claw 8 ... Cam follower 9 ... Cam gear 9a ... Cam groove 10 ... Servo motor 11 ... Drive gear A ... Workpiece treatment Tool B ... Rotor C ... Clamp mechanism D ... Press-fit punch

Claims (4)

In the pulley clamping mechanism when pressing the rotor into the pulley,
The clamp mechanism has a large number of clamp claws on the circumference that slide back and forth so as to enter the V groove of the pulley, and each of the multiple clamp claws includes a reference clamp claw and a centripetal claw. And
The centripetal claw is urged to protrude forward with respect to the reference clamp claw and is arranged slidable back and forth,
The tip of the reference clamp claw and the tip of the centripetal claw are formed in substantially the same cross-sectional mountain shape,
The reference clamp claw and the tip of the centripetal claw are arranged side by side in the axial direction so that the mountain shape is continuous,
When the reference clamp claw moves forward and clamps the pulley, the centripetal claw moves back and forth in accordance with the groove shape of the pulley, and the reference clamp claw and the V-groove into which the centripetal claw enters respectively. A pulley clamping mechanism characterized by simultaneously performing centripetalization and clamping by bringing the respective surfaces of the reference clamp claw and centripetal claw into close contact . Wherein the centripetal pawl coil spring, pulley clamping mechanism according to claim 1, characterized in that it is energized. The pulley clamping mechanism according to claim 1 or 2, wherein the clamping claws are driven simultaneously by a single driving mechanism. The single drive mechanism comprises an upper cover made of an annular flat plate, an annular cam gear having teeth formed on the outer periphery, and a drive gear that is directly connected to a servo motor and meshes with the cam gear.
A large number of the clamp claws are arranged on the circumference interposed between the upper cover and the cam gear,
The cam follower is rotated in a specific direction by a cam follower attached to the lower rear portion of the clamp pawl and a cam groove formed at a constant angle with the cam gear, and the cam follower is engaged with the cam follower. The pulley clamping mechanism according to claim 3, wherein the pulley clamping mechanism moves forward along the cam groove and simultaneously advances the clamp pawl toward a center direction.

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