JPH0732224A - Bolt press-fitting device - Google Patents

Abstract

PURPOSE:To press-fit the respective bolts of workpieces with different bolt pitch circles easily into the cores of the workpieces by a common press-fitting head by providing head switching mechanism for switching the axis of the bolt press-fitting head to a different pitch circle. CONSTITUTION:After the termination of press-fitting a first hub, a ram is moved up to make pitch switching drive pistons 51, 52, fixed to the device frame body 75 side, face the rack gears 43, 44 of pitch circle switching mechanism 40, and the other end of a link is pressed by a piston 60 to oscillate the link against the spring force of a spring so as to release the engagement to an engaging piston and to release the lock to a pinion gear 26. In this state, one switching drive piston 51 is driven to rotate the pinion gear 26 by 180 deg. through the rack gear 43, thus switching from the pitch circle of one hub to the pitch circle 6f the other hub.

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 making the latter press-fitting positions switchable does not make the switching mechanism itself large in size, and makes it possible to raise and lower them integrally. The driving force is also 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 axial position from the bolt pitch position of the first work to the bolt pitch position of the second work.

[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 work supporting mechanism 10 for pressingly supporting the hub 70; a bolt press-fitting mechanism 20 having a hub bolt press-fitting head 25 eccentric to the ram 1 center by a predetermined distance;
The bolt press-fitting mechanism 20 is mounted on the hub bolt 71 with the ram 1 as the center while the angular position of the bolt 30 is being detected by the sensor 30a.
Split rotation mechanism 30 for split rotation along the pitch circle
A pitch circle switching mechanism 40 for switching the radius of the pitch circle so as to be compatible with different types of hubs 70, a drive mechanism 50 for driving the switching mechanism 40, and a press fitting head 25 on the rotary cylinder 24 side. An engagement releasing mechanism 60 for pressing the provided engagement piston 47 to release the engagement of the pinion gear 26 fitted to the head rotating cylinder 24 as shown in FIG. 2, while the hub 70 is provided with the pallet 72. A positioning mechanism 60 for positioning a workpiece so that the axis of the hub 70 and the axis of the ram 1 can be aligned with each other on a conveyor traveling path conveyed through
And are provided.

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. A work supporting head 13 having a lower end made of a flat pressing plate 14 is attached to the ram 4.
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. When the rack gear 44 slides in the direction of arrow a and is in contact with the stopper 46 at the position shown in FIG. 4, the axial center of the press-fitting head 25 is an inner side corresponding to the pitch circle of the first hub as shown in FIG. When the rack gear 43 is eccentric to the position corresponding to the pitch circle P1 and the rack gear 43 slides in the direction of the arrow b and contacts the stopper 45, the axial center of the press-fitting head 25 corresponds to the pitch circle of the second hub. The eccentric amount is set so as to be eccentric to the position corresponding to the circle P2.

In this case, the distance R between the axis of the rotary cylinder 24 and the axis of the work supporting head 25 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 R between the rotary cylinder 24 shaft center and the press-fitting head 25 shaft center. 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.
This is done by a drive piston 60 consisting of one fluid cylinder mounted on the side. That is, the drive piston 60
Is attached to the side of the device frame 75 facing the link 48 in which the spring 49 is inserted at the end of the rise of the ram 1, and the drive piston 60 faces the other end of the link 48 at the end of the rise of the ram 1, By swinging the link 48 against the spring force of 49, the engagement between the engagement piston 47 and the pinion gear 26 is released.

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.
A first positioning mechanism 60A for locking the shaft center of the one hub 70A arranged above to the position where the shaft center of the ram 1 on the press-fitting device side coincides, and the other hub 7 adjacent to the one hub 70A.
A second positioning mechanism 60B for locking the shaft center of 0B at the position matching the shaft center of the ram 1 on the press-fitting device side is attached. Each of these positioning mechanisms 60A and 60B is mounted on a base 69, and has a hook-shaped claw member 61 pivotally supported by a spring 64 in the direction of arrow D, and a fluid having a roller 62 at the tip of the rod. It is composed of a cylinder 63, and the tip portion 2a of the pallet 72 has a conveyor roller 8
1, 82, the inclined surface 61a of the claw member 61.
The pallet 72 is locked by being fitted between the roller 62 and the roller 62 while pressing, and at a position where the shaft center of the hub 70A is aligned with the ram 1 shaft center of the press-fitting device side via the pallet 72, The hub 70A is placed on the press pedestal 79.

When the piston rod 63A of the fluid cylinder 63 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
The one positioning mechanism 60A, B is provided to deal with the pallet 2 on which the two hubs 70A, B are placed as shown in the figure.

According to such an embodiment, the hub bolt press-fitting device comprises a conveyor roller 81 for mounting two kinds of hubs 3A, 3B on the pallet 2 in a horizontal state and traveling in the arrow X direction.
In use, the pallet 2 having the hubs 3A and 3B placed horizontally in a predetermined posture is conveyed by the conveyor rollers 81 and 82, and the first hub 60A is attached to the ram 1 axis of the press-fitting device. The positioning mechanism 60 is stopped while the axes are aligned. At the time of press-fitting the hub bolt 71, with the pallet 2 fixed in position by the work positioning mechanism 60, the hub bolt 71 is press-fitted by the press-fitting head 25 while pressing the hub 60A by the pressing plate 14 of the work supporting head while lowering the ram 1. Thereafter, while repeatedly moving up and down the ram 1, the bolt press-fitting mechanism 20 is rotated by a predetermined angle by the split rotary mechanism 30, and five or six hub bolts 71 are sequentially press-fitted.

After the press-fitting of the first hub 60A 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 spring 4 is attached to the disengagement drive piston 60.
The other end of the link 48 in which 9 is inserted faces each other, and the engagement releasing drive piston 60 presses the other end of the link 48 to swing the link 48 against the spring force of the spring 49. The engagement of the combined piston 47 is released, and 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 60B can be press-fitted into two kinds 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 and 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 engagement release mechanism

Claims (1)

[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.