JP3433474B2 - Bolt press-in device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bolt press-fitting device in which bolts can be press-fitted into respective bolt positions of two kinds of works having different bolt pitch circles with respect to a work core, and particularly, to a hub bolt having different pitch circles. The present invention relates to a hub bolt press-fitting device in which various types of hubs can be easily press-fitted with a single press-fitting head.

[0002]

2. Description of the Related Art Conventionally, a hub incorporated in a suspension system of an automobile is placed on a pallet in a predetermined posture, and the pallet is conveyed to each station position by a conveyor for cleaning the hub, supplying parts, press-fitting a hub bolt, etc. A series of assembling work related to the hub assembling is carried out in sequence on the conveyor for automation. Then, in the hub bolt press-fitting step by the conveyor, a plurality of bolts arranged on a predetermined pitch circle centering on the work core are press-fitted to the hub side, but at this time, it is also considered that all the hub bolts are press-fitted together. Although it is necessary to press-fit about 4.5 tons into one press-fitting machine, for example, if 6 hub bolts are to be press-fitted at one time, press-fitting pressure of 27 tons is required, which inevitably leads to an increase in size of the device itself. I can't get it.

Therefore, in the hub assembly line, since the cycle pitch in other stations is long, it is not always necessary to press-fit the hub bolts all at once, and the bolts are individually press-fitted sequentially. On the other hand, in recent years, in order to improve the efficiency of the production line, a mixed production line of multiple vehicle models has been proposed. However, in such a line, the bolt pitch circle of the hub to be used may be different. In order to enable press-fitting of a plurality of hub bolts having different bolt pitch circles in the device, it is necessary to provide a plurality of press-fitting heads or to be able to switch the press-fitting positions of the press-fitting heads.

[0004]

However, the press-fitting head itself is applied with a press pressure of 4.5 tons,
Providing a plurality of them as in the former also imposes a heavy burden on the weight, and in the latter, being able to switch the press-fitting positions, the switching mechanism itself has to be considerably large, and these are integrated. In order to move it up and down, the driving force also becomes considerably large. In view of the above technical problem, it is an object of the present invention to provide a bolt press-fitting device capable of easily press-fitting two types of works having different bolt pitch circles into a work core with a single press-fitting head. .

[0005]

SUMMARY OF THE INVENTION In order to achieve such a technical object, the present invention is a bolt press-fitting construction in which bolts can be press-fitted into respective bolt positions of two types of works having different bolt pitch circles with respect to the work core. In the apparatus, a head switching mechanism configured to switch the press-fitting head shaft center of the bolt from a first pitch circle to a second pitch circle, and an elevating mechanism that raises and lowers the switching mechanism integrally with the press-fitting head. A pitch circle switching drive mechanism that applies a driving force for switching the pitch circle to the switching mechanism, and an engagement release mechanism that releases the engagement between the switching position fixing member provided on the switching mechanism side and the switching mechanism. The pitch circle switching drive mechanism and the engagement releasing mechanism are arranged on the apparatus frame side separately from the switching mechanism and the lifting mechanism of the press-fitting head, and when the press-fitting head is raised by the lifting mechanism. The switching drive mechanism and the engagement release mechanism are configured to face each other in the switching mechanism, and after the engagement between the switching position fixing member and the switching mechanism is released by the engagement release mechanism, the switching mechanism is operated by the drive mechanism. It is characterized in that it can be driven to switch the press-fitting head shaft center position from the bolt pitch position of the first work to the bolt pitch position of the second work. In particular, as described in paragraph [0012] below, The pitch circle switching mechanism is composed of a differential mechanism (a rack / pinion or the like) that differentially operates in parallel to the left and right and a stopper, and the press-fitting head shaft center is formed by the differential mechanism into a first pitch circle and a second hub. The head rotation axis is eccentrically located at positions corresponding to the pitch circles.

[0006]

According to the above technical means, one press-fitting head can switch the press-fitting head axial position from the bolt pitch position of the first work to the bolt pitch position of the second work through the switching mechanism. A single press-fit head can be used for hubs of a plurality of vehicle types, and can be easily applied to a production line of a mixed vehicle type. Further, since the one press-fitting head sequentially press-fits while moving up and down in a state where the position is fixed by the switching position fixing member, the press-fitting position can be stably press-fitted accurately. Then, the pitch circle of the press-fitting head is switched by releasing the engagement between the switching position fixing member and the switching mechanism by the engagement releasing mechanism, and then driving the switching mechanism by the driving mechanism. At this time, it is inevitably heavy to inevitably rotate the drive mechanism and the engagement release mechanism integrally.
Therefore, in the present invention, the pitch circle switching drive mechanism and the engagement releasing mechanism are arranged on the apparatus frame side separately from the switching mechanism and the elevating mechanism of the press-fitting head, and only the press-fitting head can be elevated together with the switching mechanism. There is. As a result, the weight burden can be reduced.

Further, according to the present invention, when the press-fitting head is raised by the elevating mechanism, the pitch circle switching drive mechanism and the engagement releasing mechanism can face each other in the switching mechanism only near the top dead center of the head. Since the mechanism is arranged at a position where it does not malfunction during the operation of the press-fitting head, the mechanism is always press-fitted while the engagement between the switching position fixing member and the switching mechanism is maintained. Is.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be exemplarily described in detail below with reference to the drawings. However, unless otherwise specified, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention thereto, but are merely illustrative examples. Only. 1 to 5 show a hub bolt press-fitting device according to an embodiment of the present invention. As shown in FIG. 1, when a hub bolt 71 is press-fitted on a ram 1 (see FIG. 2) shaft core which is moved up and down by press pressure. A bolt press-fitting mechanism 20 having a work support mechanism 10 that presses and supports the hub 70, and a hub bolt press-fitting head 25 that is eccentric to the ram 1 axis by a predetermined distance.
And a split rotation mechanism 3 for split-rotating the bolt press-fitting mechanism 20 around the ram 1 along the pitch circle of the hub bolt 71 while detecting its angular position by the sensor 30a.
0 and the radius of the pitch circle are switched to make a hub 70 of a different type.
2, a pitch circle switching mechanism 40 that makes it possible to correspond to the above, a driving mechanism 50 that drives the switching mechanism 40, and an engaging piston 47 provided on the rotary cylinder 24 side of the press-fitting head 25 are pressed, as shown in FIG. And a disengagement mechanism 60 for disengaging the pinion gear 26 fitted to the head rotation cylinder 24, while the hub 70 is installed on the conveyor traveling path where the hub 70 is conveyed through the pallet 72. Positioning mechanism 6 that positions the workpiece so that the core and the axis of the ram 1 can be aligned
0A and 60B (see FIG. 4) .

The structure of each part will be described in detail below. In the work supporting mechanism 10, as shown in FIG. 2, a cylinder 11 is mounted directly below the ram 1 via a mounting portion 1A on the same axis of the ram 1, and a compression spring 12 is mounted inside the cylinder 11. The work supporting head 13 having a lower end made of a flat pressing plate 14 is attached to the ram 1.
The pressing plate 14 is brought into contact with the upper surface of the hub 70 when the hub 70 is lowered, and the hub 70 is pressed and fixed to the pallet 72 before the hub bolt 71 is press-fitted by the pressing force of the spring 12. The pressing plate 14 is attached to the hub 7 by the spherical swinging portion 13a.
It is designed to deal with unstable mounting where 0 is slightly inclined.

The press-fitting mechanism 20 includes the split rotation mechanism 3
The upper end shaft is fitted to the turning gear 31 of
The head rotating cylinder 24, which rotates about the axis of the ram 1 through the bearing members 16 and 17 attached to the cylinder 11 according to the rotation of the cylinder 11, and the lower end of the rotating cylinder 24, which is eccentric by the distance A, is attached. It is composed of a bolt press-fitting head 25 and a pinion gear 26 for rotating the rotary cylinder 24 by 180 ° fitted to the upper end shaft of the head rotary cylinder 24.

As shown in FIG. 3, the split turning device 30 is a turning gear 31 that turns around the cylinder 11 via the bearing member 17 together with the press-fitting mechanism 20 and a pinion gear that meshes with the turning gear 31. A brake motor 33 having 32 and a proximity sensor 30a for detecting the angular position of the rotating gear 31 are used to rotate the rotating gear 31 by the brake motor 33 while controlling the number of teeth of the rotating gear 31. The number of divided teeth is determined while counting by the proximity sensor 30a.

As shown in FIG. 3, the pitch circle switching mechanism 40 is engaged with both sides of the pinion gear 26 and differentially slides in parallel to the left and right rack gears 43 and 44, and the stopper 4.
It is composed of 5 and 46. The rack gear 44 has an arrow a
When in the position shown in FIG. 3 that slides in the direction and contacts the stopper 46, the axis of the press-fitting head 25 corresponds to the inner pitch circle P1 corresponding to the pitch circle of the first hub as shown in FIG. Eccentric to the position, while the rack gear 43 is indicated by the arrow b.
The eccentricity is set so that when it slides in the direction and comes into contact with the stopper 45, the axis of the press-fitting head 25 is eccentric to a position corresponding to the outer pitch circle P2 corresponding to the pitch circle of the second hub.

In this case, the distance R between the shaft center of the rotary cylinder 24 and the shaft center of the work supporting head 13 is {(P1 + P2) /
2}, and the distance A between the axis of the rotary cylinder 24 and the axis of the press-fitting head 25 is preferably set to {(P2-P1) / 2}. P1: first work pitch circle (inner pitch circle) radius P2: second work pitch circle (outer pitch circle) radius The radius of the rotary cylinder 24 is the distance A between the rotary cylinder 24 axis and the press-fitting head 25 axis. Need to set higher. The drive mechanism 50 of the pitch circle switching mechanism 40 is composed of drive pistons 51 and 52 formed of a pair of fluid cylinders attached to the device frame 75 side. That is, as shown in FIG. 2, the drive pistons 51, 52 are arranged such that the rack gears 43, 44 of the pitch circle switching mechanism 40 are at the end of the rise of the ram 1.
Mounted on the side of the device frame 75 that faces the rack, and the drive pistons 51, 52 are mounted on the rack gear 4 when the ram 1 has finished rising, in other words, when the rotary cylinder 24 is located at the top dead center.
Face the tips of 3, 44, and the pistons 51, 52 of the one
By driving the pinion gear 26 through the rack gears 43 and 44, the pinion gear 26 can be rotated 180 °, and the pitch circle P1 of one hub can be switched to the pitch circle P2 of another hub.

The pinion gear 26 is an angle fixing mechanism 4
The angle is regulated by the engagement with the second engagement piston 47 so that the position can be fixed. That is, as shown in FIG. 2, the engagement piston 47 having a wedge end that engages with the eccentric pinion gear 26 has a piston shape that is fitted into the cylinder 47A so as to be separated from the pinion gear 26, and the engagement is performed. One end of the link 48 is connected to the piston base of the piston 47, and the engagement piston 47 is constantly engaged with the pinion gear 26 by a spring 49 that presses the other end of the link 48 via a fulcrum 48a to lock its rotation. To configure.

Further, the lock of the engagement piston 47 is released by the device frame 75 below the pair of drive pistons 51 and 52.
For disengagement consisting of one fluid cylinder mounted on the side
This is done by the drive piston 600 . That is, the engagement solution
The removal drive piston 600 is attached to the device frame 75 side facing the link 48 in which the spring 49 is inserted at the end of the rise of the ram 1, and the removal drive piston 600 is installed at the end of the rise of the ram 1.
The engagement releasing drive piston 600 faces the other end of the link 48, and the engagement between the engagement piston 47 and the pinion gear 26 is released by swinging the link 48 against the spring force of the spring 49.

On the other hand, as shown in FIGS. 4 and 5, the work transfer device side is provided with a pair of conveyor rollers 81 and 82 arranged on both left and right sides in the transfer direction of the pallet 72, and the pallet 72.
The first positioning mechanism 60A that locks the one hub 70A arranged on the upper side at a position where the shaft center of the one hub 70A matches the shaft center of the ram 1 on the side of the press-fitting device, and the claw by the first positioning mechanism 60A.
After the positioning and fixing of the sleeve 70A is released, a pair of
Adjacent to the one hub 70A along the rollers 81, 82.
The axis of the other hub 70B is the axis of the ram 1 on the press-fitting device side.
After moving to a position that matches
A second positioning mechanism 60B for positioning and locking is attached. And these positioning mechanisms 60A, 60
Both B are mounted on the base 69, and by the spring 64
A hook-shaped claw member 61 pivotally supported in the direction of arrow a ;
The rod cylinder comprises a fluid cylinder 630 having a roller 62 at its tip, and as the tip portion 72a of the pallet 72 advances the conveyor rollers 81, 82, the inclined surface 61a of the pawl member 61 is pressed and the gap between the roller 62 and the roller 62 is increased. The pallet 72 is locked by fitting it to the pallet 7
The hub 70A through the ram 1 on the side of the press-fitting device.
Press the hub 70A to the press pedestal 7 at a position matching the axis.
Place on top of 9.

When the piston rod 63 of the fluid cylinder 630 descends, the positioning and fixing of the hub 70A is released, and the positioning mechanism 60B at the next position fixes the position of the other hub 70B. The above 2
One of the positioning mechanism 60A, 60 B is provided in order to cope with the pallet 72 for mounting the two hubs 70A, 70 B as shown in FIG.

According to such an embodiment, the hub bolt press-fitting device has a conveyor roller 8 for moving two types of hubs 70A and 70B horizontally on a pallet 72 and traveling in the X direction.
1, 82 on the hub 70A,
The pallet 72 in which 70B is placed horizontally in a predetermined posture is conveyed by the conveyor rollers 81 and 82, and is stopped by the positioning mechanism 60A with the axis of the first hub 70A aligned with the axis of the ram of the press-fitting device. . Hub bolt 71
Work positioning mechanism 6 to the pallet 72 at the time of press-fitting of
With the position fixed by 0A, the hub bolt 71 is press-fitted by the press-fitting head 25 while the hub 70A is being pressed by the pressing plate 14 of the work supporting head while the ram 1 is being lowered. While being rotated by a predetermined angle by the split rotating mechanism 30, five or six hub bolts 71 are sequentially press-fitted.

After the press-fitting of the first hub 70A is completed, the ram 1 is moved up to the pitch switching drive pistons 51, 52 fixed to the apparatus frame 75 side, and the rack gears 43, 44 of the pitch circle switching mechanism 40 are mounted. While facing
The disengagement driving piston 600, the spring force of the spring 49 by the spring 49 is facing the inserted link 48 the other end, the engagement releasing the drive piston 600 presses the link 48 the other end By swinging the link 48 against, the engagement of the engagement piston 47 is released,
The lock with the pinion gear 26 is released.

In this state, by driving the one switching drive piston 51, the pinion gear 26 rotates 180 ° via the rack gear 43, and the pitch circle P1 of one hub to the pitch circle of another hub. You can switch to P2. Then, the other hub 70B can be press-fitted into two types of hubs by repeating the same press-fitting operation as described above.

[0021]

As described above, according to the present invention, it is possible to easily press-fit each of two types of works having different bolt pitch circles into the work core with a single press-fitting head, and to use the split rotation mechanism. By combining the above, even if the number of bolts press-fitted into each work is different, it can be easily dealt with.
Further, since the pitch circle switching mechanism and its drive mechanism are separated and the drive mechanism is provided on the machine frame side, the press-fitting operation can be performed without causing a weight burden.

[Brief description of drawings]

FIG. 1 is a perspective view showing an outline of a hub bolt press-fitting device according to an embodiment of the present invention.

FIG. 2 is a front view of the main part on the press-fitting device side, excluding the conveyor device of FIG.

FIG. 3 is an enlarged view of a main part of a pitch circle switching mechanism portion of FIG.

FIG. 4 is a front view of a main part of the conveyor device side of FIG. 1.

5 is a side view of a main part of the conveyor device side of FIG. 1. FIG.

[Explanation of symbols]

3 hubs R1, R2 bolt pitch circle 25 Press-fitting head 40 pitch circle switching mechanism 1 Lifting mechanism 50 pitch circle switching drive mechanism 47 Switching position fixing member 60 Disengagement mechanism

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A 61-192423 (JP, A) JP-A-3-214698 (JP, A) Actual development Sho-61-78530 (JP, U) (58) Field (Int.Cl. ⁷ , DB name) B23P 19/00-21/00

Claims (2)

(57) [Claims] 1. A bolt press-fitting device in which bolts can be press-fitted into respective bolt positions of two types of works having different bolt pitch circles with respect to a work core, wherein the press-fitting head shaft center of the bolt is a first pitch circle. To a second pitch circle, a head switching mechanism for raising and lowering the switching mechanism integrally with the press-fitting head, and a driving force for switching the pitch circle to the switching mechanism. A pitch circle switching drive mechanism and an engagement releasing mechanism for releasing the engagement between the switching position fixing member provided on the switching mechanism side and the switching mechanism. Disposed separately from the switching mechanism and the elevating mechanism of the press-fitting head on the apparatus frame side, and when the press-fitting head is raised by the elevating mechanism, the switching drive mechanism and the engagement releasing mechanism face each other. After the engagement between the switching position fixing member and the switching mechanism is released by the engagement release mechanism, the switching mechanism is driven by the drive mechanism to move the second work from the bolt pitch position of the first work. A bolt press-fitting device characterized in that the axial center position of the press-fitting head can be switched to the bolt pitch position of the. 2. The pitch circle switching mechanism comprises a differential mechanism (a rack / pinion or the like) that differentially moves in parallel to the left and right, and a stopper, and the differential mechanism causes the press-fitting head shaft center to a first pitch. 2. The bolt press-fitting device according to claim 1, wherein each of the positions corresponding to the circle and the pitch circle of the second hub is configured to be eccentric from the head rotation axis.