JP3069242B2 - Constant velocity joint shaft holding device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a collet chuck having a tapered surface, in which a cylindrical straight collet selected according to the diameter of the shaft portion of a constant velocity joint is detachably fitted. for performing pressurization Kosho management by holding the shaft portion, there is no need to replace the collet chuck so as to correspond to the shaft portion of the constant velocity joint Hitoshisokuji
The present invention relates to a point shaft holding device.

[0002]

2. Description of the Related Art In order to assemble or process a work having a cylindrical portion in part, a device for holding the work using a collet chuck has been frequently used. For example, Japanese Unexamined Utility Model Publication No. Sho 62-65532 discloses a chuck unit of this type. Briefly describing this, in FIG. 6, reference numeral 2 denotes a chuck main body, and a tapered guide surface 4 for a collet chuck is defined in the chuck main body 2. Using this tapered guide surface 4, a collet chuck 6 having a tapered surface formed outside is inserted. Therefore, if the collet chuck 6 is moved in the direction of the arrow X, the work W held by the collet chuck 6 is tightened by reducing the hole diameter of the collet chuck 6, and the work W can be held. On the other hand, the collet chuck 6 moves in the direction of the arrow Y.
Is moved, the work W is released from the tightened state in relation to the collet chuck 6.

[0003]

In this type of collet chuck 6, a hydraulic drive source is used to move the collet chuck 6 in the direction of the arrow X or Y, and the type of the work W is changed. As a result, the diameter of the shaft to be held by the work W becomes different, so it is necessary to replace the collet chuck 6 with the collet chuck 6 corresponding to the shaft diameter. As described above, every time the type of the work W is changed, the production activity is interrupted due to the exchange of the collet chuck 6.

Further, the hydraulic drive source and the collet chuck 6 are connected to each other by a bayonet method or a screwing method. In any case, the connection between the hydraulic drive source and the collet chuck 6 is extremely tight. Since the connection is performed, it is extremely troublesome to perform the connection, and in some cases, it has been pointed out that inconvenience such as wasting a large amount of time is required for adjusting the phase of the collet chuck to the work W.

SUMMARY OF THE INVENTION The present invention has been made to overcome all of the above-mentioned disadvantages, and further includes inserting a cylindrical straight collet into a collet chuck, and connecting the straight collet to a work , for example, a constant velocity joint . if changed according to shaft diameter, can easily correspond to different <br/> become constant velocity joint of a plurality of, the shank diameter, moreover, Pi
If binding consolidated once between the drive source side and the collet chuck including a piston, both subsequently in accordance with the change of the work
It is an object of the present invention to provide a constant-velocity joint shaft holding device that does not need to be disengaged, improves production efficiency, and is economical.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention comprises a main body having a tapered hole formed in a central portion, and a first hole which is straight along an axis. A collet chuck fitted to the tapered portion of the main body and moving in the hole of the main body to change the diameter of the first hole, and a collet chuck fitted to the collet chuck and internally having an axial line therein; A straight collet having a straight second hole portion and having a diameter of the second hole portion variable by displacement of the collet chuck, and a collet chuck provided in the main body, the collet chuck being disposed along the tapered hole portion. and an actuator for moving Te, made from, the straight co
The second hole of the let holds the shaft of the constant velocity joint
Having a sufficient inner diameter, inserting the shaft portion of the constant velocity joint into the second hole portion of the straight collet, and displacing the collet chuck under the driving action of the actuator to thereby form the second hole portion of the straight collet. characterized by holding the shaft portion by reducing the diameter.

[0007]

The straight collet inserted into the collet chuck is selected according to the shaft diameter of the shaft portion of the constant velocity joint which is the workpiece . The selected straight collet is inserted into the collet chuck, and the collet chuck holds the straight collet. At this time, the straight collet cover member can prevent the straight collet from detaching from the main body. Constant velocity joint axis held by straight collet
The part is processed by desired means. Constant velocity
When it is necessary to change the type of point and replace the straight collet, the drive source for the collet chuck may be urged in the opposite direction to release the straight collet from the collet chuck. Newly selected etc.
A straight collet corresponding to the shaft diameter of the speed joint is inserted into the collet chuck to urge the drive source again, and the collet chuck can hold the straight collet.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A constant velocity joint shaft holding device according to the present invention will be described in detail below with a constant velocity joint outer ring holding device as a preferred embodiment.

In FIG. 1, reference numeral 10 denotes a gantry, on which a constant velocity joint outer ring holding device 20 is mounted. The device 20 basically includes a first main body 22 and a second main body 24 that fits into the first main body 22, and the first main body 22 is fastened to the gantry 10 by a plurality of bolts 26. ing. On the other hand, the second main body 24 functions as a lid member that closes the hole 28 extending in the axial direction of the first main body 22. Substantially, the first body 22 and the first body 22 are integrated by a bolt 30 penetrating the second body 24. A pressure oil supply port 32 is defined on the side of the first main body 22, and this pressure oil supply port 32 communicates with a cylinder chamber 34 defined in the first main body 22.

A piston 36 is provided in the cylinder chamber 34 so as to be freely displaceable. The piston 36 has a first piston rod 36a and a second piston rod 36b extending in opposite directions, and has a through hole 38 defined along the axis thereof. A shaft 40 for centering a work W, which is an outer race of a constant velocity joint, is disposed inside the through hole 38 so as to be freely displaceable. As shown in FIG.
As described above, the tip of the shaft 40 is sharpened in a tapered shape. In FIG. 1, a coil spring 41 is wound around the shaft 40 so as to constantly urge the shaft 40 upward by a resilient force. One end of the coil spring 41 is in contact with the large diameter portion 43 of the shaft 40. The rear end of the shaft 40 extends through a hole to the outside of the lid member 42 fixed to the second main body 24.

The lid member 42 is fixed to the piston 36 via a bolt 44. The hole 28 has an attachment 46 provided on the second main body 24 on the cover member 42 side and an attachment 48 provided on the piston 36 side.
1, a disc spring 50 is provided, and in FIG. 1, the disc spring 50 constantly urges the piston 36 upward.

In FIG. 1, above the first main body 22,
A hole 52 whose one end is formed in a tapered shape is provided, and a tapered surface 5 slidingly contacting the tapered surface of the hole 52.
A collet chuck 56 having a 4 is fitted. A cylindrical member 58 extends from the lower end of the collet chuck 56,
Under end of the cylindrical member 58 is bent inward claw member 59
The claw member 59 is fitted in a groove formed in the first piston rod 36a of the piston 36. In this case, as shown in FIG. 2, when the pawl member 59 is fitted in the groove of the piston 36 in a bayonet manner, it is convenient to attach and detach the collet chuck 56. The inside of the collet chuck 56 is defined as a substantially straight cylindrical hole, and the straight collet 60 fits into the cylindrical hole.
The straight collet 60 will be described later in detail.

[0013] One end of a pin-shaped detent member 62 is engaged with the collet chuck 56, and the other end is engaged with a straight collet cover 64.
The straight collet cover 64 is seated in a stepped hole provided inside the collet cover 66, and the collet cover 66 is engaged with the first main body 22 via the bolt 68. The straight collet cover 64 is provided with a stepped portion 72 facing the head of a bolt 70 having a relatively short length screwed to the straight collet cover 64. As shown in FIG. 3, the stepped portion 72 extends with a predetermined length on the upper outer peripheral portion of the straight collet cover 64, and terminates in a semicircular hole 73.

A straight collet 60 is shown in FIG. As is easily understood from FIG. 4 , a flange 80 is provided at one end of the straight collet 60, and a through hole 82 is defined at the center. The straight collet 60 that defines the through hole 82 has a plurality of first slits 84 extending from one end to the other end along the axial direction and terminating immediately before the end. , A plurality of second slits 86 extending between the adjacent first slits 84 from the other end side and terminating immediately before the end thereof are defined. A tapered surface 88 is formed on one end and a tapered surface 90 is formed on the other end.

The constant velocity joint outer ring holding device 20 according to this embodiment is basically configured as described above, and the operation thereof will be described next.

First, in the state shown in FIG. 1, the pair of bolts 70 are turned in the releasing direction, whereby the straight collet cover 64 can freely rotate. Therefore, this straight collet cover 64
The straight collet cover 64 is rotated so that the head of the bolt 70 is positioned in the semicircular hole 63 of FIG. Thus, the straight collet cover 64 can be detached from the first main body 22. Next, the already mounted straight collet 60 is removed from the collet chuck 56. When waiting for the next processing after such a state, a straight collet 60 that fits the shaft portion W1 of the work W is selected in the central hole of the collet chuck 56 and inserted into the central hole. That is, the flange 80 of the straight collet 60 is
The straight collet 60 may be pushed in until the end of the straight collet 60 is reached.

Next, the straight collet cover 64 is positioned on the collet chuck 56 via the rotation preventing member 62, and the straight collet cover 64 is
Tighten. Next, the shaft portion W1 of the outer race of the constant velocity joint, which is the work W, is inserted into the straight collet 60. Then, in order before Kijiku portion W1 in advance tapered grooves are provided, the shaft 40 is urged upward by the coil spring 41 is tapered tapered surface of the distal end portion of the shaft portion W1 The work W is positioned by fitting into the groove.

Then, when pressure oil is fed into the pressure oil supply port 32, the piston 36 moves downward against the elastic force of the disc spring 50. At this time, the diameter of the center hole of the collet chuck 56 in which the claw member 59 is engaged with the first piston rod 36a is reduced by the tapered surface 54, and as a result, the diameter of the straight collet 60 is reduced. Therefore,
The tightening force of the work W on the shaft portion W1 increases, and the work W is firmly held. Here, it is sufficient to predetermined processing Shi pair workpiece W.

When the machining operation is completed, the pressure oil is led out from the pressure oil supply port 32 to the outside. Therefore, the piston 36 is pushed upward in FIG. 1 by the elastic force of the disc spring 50, and the collet chuck 5 slidingly contacting the tapered surface 54.
The diameter of the tapered surface of 6 is also expanded outward, and the straight collet 6
The diameter of the central hole of 0 is also slightly loosened. As a result,
The shaft portion W1 of the work W can be easily taken out from the constant velocity joint outer ring holding device 20 .

When the diameter of the shaft portion W1 of the work W is different,
In other words, the model changes and the like there of the constant velocity joint is, the axis
If the diameter is different , use another straight collet 60 in advance.
Can be used to replace complicated collet chucks .
Need not be. That is, this straight collet 60
Effect that only the constant velocity joint of the machine species variations more readily accommodate to replace only.

[0021]

According to the present invention, a conventional constant velocity joint
The collet chuck, which had been replaced in accordance with the above model, can be easily changed even when the straight collet is replaced without replacing the collet chuck under a complicated operation. As a result ,
Setup time corresponding to the model change Into extremely not significantly shortened, thereby improving the productivity.

[0022] Moreover, it is possible to produce the easily by a plurality of kinds of straight collet changing only the thickness, straight collet itself compact, lighter, being able to cost reduction The effect is obtained.

[Brief description of the drawings]

1 is a longitudinal sectional view of a constant velocity joint outer ring holding apparatus according to an embodiment of the present onset bright.

FIG. 2 is a plan view of the device shown in FIG.

FIG. 3 is a plan view showing a configuration of a straight collet cover incorporated in the apparatus of FIG.

FIG. 4 is a longitudinal sectional view of a straight collet incorporated in the apparatus of FIG.

FIG. 5 is an explanatory longitudinal sectional view of a state in which a constant velocity joint outer ring as a work is held in the apparatus shown in FIG. 1;

FIG. 6 is a schematic longitudinal sectional view of a conventional collet chuck.

[Explanation of symbols]

Reference Signs List 20: constant velocity joint outer ring holding device 36: piston 40: shaft 50: disc spring 56: collet chuck 60: straight collet 64: straight collet cover

Claims (3)

(57) [Claims] 1. A main body having a tapered hole formed in a central portion thereof, and a first hole straight along an axis. The first hole is fitted into a tapered portion of the main body, and the inside of the hole of the main body is formed. A collet chuck that changes the diameter of the first hole portion by moving; a second hole portion that is fitted to the collet chuck and that is straight along an axis therein; A straight collet having a variable diameter of the second hole portion; and an actuator disposed on the main body for moving the collet chuck along the tapered hole portion. Is a constant velocity joint
The constant velocity join has an inner diameter sufficient to hold the shaft portion of the straight collet and the second hole portion of the straight collet.
Insert the shaft portion of the bets, characterized in that for holding the shaft portion by displacing the collet chuck by operation of the actuator to reduce the diameter of the second hole portion of the straight collet constant velocity Joint shaft holding device. 2. A constant velocity joint shaft holding instrumentation <br/> location according to claim 1, wherein the collet cover and said to be fixed to the body
It has a straight collet cover member which engages the collet cover, prevents child that straight collet by the straight collet cover member is disengaged from the body
And a constant velocity joint shaft holding device. 3. A constant velocity according to claim 1 or 2.
In the joint shaft holding device, the straight collet is formed of a cylindrical body, extends from one end of the cylindrical body to the other end, and terminates immediately before the other end. A slit, provided between the first slit,
Extending from the other end of the cylindrical body to one end,
A plurality of second slits terminating immediately before the one end, and an opening end of the collet chuck;
The engaging flange is formed at one end.
Constant velocity joint shaft holding device.