JP2956238B2 - Parts press-fitting 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 part press-fitting device for press-fitting a part such as a bearing or a bush into a work such as a cylinder case of an engine.

[0002]

2. Description of the Related Art FIG. 5 is a view showing a schematic structure of a general part press-fitting device. A press-fit cylinder mounting plate 2 is fixedly mounted on a base 1, and the press-fit cylinder mounting plate 2 is press-fitted. The cylinder 3 is mounted. A column 4 is provided upright on the press-fit cylinder mounting plate 2, and an intermediate plate 5 is provided at an appropriate height of the column 4. Further, an upper plate 6 is provided on the top of the column 4, and a backup cylinder 7 is mounted on the upper plate 6 on the same axis as the press-fit cylinder 3.

When a work, such as a cylinder case of an engine, is set at a predetermined position on the intermediate plate 5 while being mounted on a pallet, the rod 7a of the backup cylinder 7 is lowered to press the work from above, and The press-fitting punch 3a holding the parts to be press-fitted is raised by the press-fitting cylinder 3, and the above-mentioned parts are pressed into the work.

[0006] FIG. 6 is an explanatory view of the operation of press-fitting the bearing of the cylinder case in the above-mentioned press-fitting device. In the drawing, reference numeral 10 denotes a pallet, and this pallet 10 is placed on a roller 11 provided on the intermediate plate or the like. When the pallet 10 is moved and comes to a predetermined position, the pallet 10 is lifted by the lifter 12 and is clamped and fixed between the pallet 10 and the locking device 13.

By the way, the bearing press-fitting hole of the cylinder case is processed on the lower surface of the case, and the surface to be contacted by the backup rod remains casting surface. Therefore, it is necessary to closely contact the lower surface of the case and the reference plate so that the cylinder case does not tilt even if the backup portion hits one side. Therefore, a reference plate 14 on which the cylinder case is placed is provided above the pallet 10 so as to be able to move only up and down while maintaining a horizontal state.
The center of the pallet 10 and the reference plate 14 is further provided with openings 10a and 14a through which the press-fitting punch 3a operated by the press-fitting cylinder 3 can be inserted. Has been established.

Thus, the reference plate 14 of the pallet 10
When the cylinder case 16 is placed thereon, transported to a predetermined position and fixed, the press-fitting cylinder 3 raises the press-fitting punch 3 a supporting the bearing 17 at the top end, and then the backup rod 7 a is raised by the backup cylinder 7 on the upper part. The cylinder case 16 is lowered together with the reference plate 14, and the bearing 17 is pressed into the bearing press-fit hole 16 a of the cylinder case 16.

FIG. 7 shows the press-fitting of the bearing 17 from above the cylinder case 16. The press-fitting of the bearing 17 is performed in almost the same manner as described above.

[0008]

However, in the above-described apparatus, it is necessary to provide a reference plate for moving the cylinder case above the pallet. When a large number of pallets are used, such as when a case is automatically transported, there are problems such as an increase in cost, and moreover, since the pallets are complicated, it is difficult to handle many types of pallets, and problems such as complicated setup are required. There is.

SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention to provide a parts press-fitting device that does not require a special configuration of a transport pallet.

[0010]

According to the present invention, a back-up rod operated by a backup cylinder supports one surface of a work, and a press-fitting punch operated by a press-fitting cylinder causes a part from the other surface of the work to be moved from the other side of the work. In the part press-fitting device for press-fitting, of the backup cylinder and the press-fitting cylinder, the inner diameter of the cylinder that presses the workpiece against the reference surface is made slightly larger than the inner diameter of the other cylinder, and the working-side cylinder chambers of both cylinders during the press-fitting process Are communicated with each other.

[0011]

When the work is pressed against the pallet by one of the press-fitting punch and the backup rod, and then the other of the pressure punch and the backup rod is pressed against the work, the parts held by the press-fitting punch are moved to the work. Pressed into. In this case, since the inner diameter of the cylinder on which the work is pressed against the pallet constituting the reference surface is larger than the inner diameter of the other cylinder, the force for pressing the work on the pallet is large, so that the work does not rise, Press-fitting of parts is ensured.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the figure, the same parts as those in FIG. 6 are denoted by the same reference numerals, and detailed description thereof will be omitted.

FIG. 1 is a view showing a part press-fitting device in which a bearing 17 is press-fitted into a cylinder case 16 from below. A press-fitting cylinder 3 is provided below, and a press-fitting punch 3a operated by the press-fitting cylinder 3 can move up and down through the opening 10a of the pallet 10.

On the other hand, above the pallet transport path,
A backup cylinder 7 is arranged on the same axis as the press-fit cylinder 3, and a backup rod 7a operated by the backup cylinder 7 can move up and down.

FIG. 2 is a control hydraulic circuit diagram of each cylinder of the part press-fitting device. An oil supply pipe 21 having one end connected to a pressure oil pump 20 has a first switching valve 23 through a pressure reducing valve 22. The first switching valve 23 is connected to the upper and lower cylinder chambers 7b1, 7b2 of the backup cylinder 7.
Are connected via check valves 24 and 25, respectively.
The pressure reducing valve 22 is provided between the oil supply pipe 21 and the inlet of the upper cylinder chamber 7b1 of the backup cylinder 7.
And the second switching valve 26 so as to bypass the first switching valve 23. Further, an oil drain port of the first switching valve 23 is connected to an oil drain pipe 27.

The oil supply pipe 21 and the oil discharge pipe 27
Are connected to the oil supply port and the oil discharge port of the third switching valve 28, respectively, and the third switching valve 28 is connected to the upper and lower cylinder chambers 3b1 and 3b2 of the press-fit cylinder 3, respectively.

When the pallet 10 on which the cylinder case 16 is mounted is fixed at a predetermined position of the parts press-fitting device via the transfer passage, the solenoid 23 of the first switching valve 23
a, the switching valve is moved upward in the figure, and the low-pressure oil depressurized by the pressure reducing valve 22 is supplied to the upper cylinder chamber 7b1 of the backup cylinder 7 through the first switching valve 23. Therefore, the backup rod 7a descends and comes into contact with the upper surface of the cylinder case 16, thereby bringing the cylinder case 16 into close contact with the upper surface of the pallet.

Therefore, the solenoid 2 of the third switching valve 28
8a, the pressure oil from the oil supply pipe 21 is supplied to the lower cylinder chamber 3b2 of the press-fit cylinder 3 via the third switching valve 28. Therefore, the press-fitting punch 3a of the press-fitting cylinder 3 is moved upward, and the bearing 17 held at the top end of the press-fitting punch 3a contacts the lower surface of the cylinder case 16 (see FIG. 1).

On the other hand, simultaneously with the switching of the third switching valve 28, the second switching valve 26 is also switched by the solenoid 26a, and the pressure oil from the oil supply pipe 21 is directly supplied to the upper cylinder chamber 7b1 of the backup cylinder 7. . Thus, the upper cylinder chamber 7b1 of the backup cylinder 7
The lower cylinder chamber 3b2 of the press-fit cylinder 3 communicates with the lower cylinder chamber 3b2 via the oil supply pipe 21 so that the same pressure oil is supplied. However, until the press-fit punch 3a comes into contact with the cylinder case 16, the backup cylinder 7 No high pressure is generated in the upper cylinder chamber 7b1.

Then, when the press-fitting punch 3a moves up and the bearing 17 comes into contact with the cylinder case 16, the pressure in both the cylinder chambers 3b2 and 7b1 increases, and the bearing 17 starts to be pressed into the bearing hole 16a of the cylinder case 16. Is done. During this time, the upper cylinder chamber 7 of the backup cylinder 7
Since the inner diameter of b1 is slightly larger than the inner diameter of the lower cylinder chamber 3b2 of the press-fitting cylinder 3, the force of the backup rod 7a always exceeds the force of the press-fitting punch 3a even if the hydraulic pressure fluctuates. The cylinder case 16 is reliably prevented from being pressed against the upper surface and raised.

When the press-fitting by the press-fitting punch 3a is completed in this way, the energization of the solenoids 23a, 28a, 26a is stopped and the solenoids 23b, 28b are energized, and the first, second, and third switching valves 23, 26, 28 is switched, the backup rod 7a and the press-fitting punch 3a are returned to their original positions, respectively, in preparation for press-fitting of the bearing into the next cylinder case.

FIGS. 3 and 4 are views showing a device for press-fitting the bearing from above the cylinder case and a control hydraulic circuit thereof. A backup cylinder 7 is provided below the pallet transfer passage, and a press-fit cylinder above the pallet transfer passage. 3 is provided, and the other configuration is almost the same as that of the first embodiment.

In this case, too, the floating of the cylinder case 16 is reliably prevented by the press-fitting punch 3a, and the bearing 17 is press-fitted by the press-fitting punch 3a.

In the above embodiment, the bearing is press-fitted into the cylinder case. However, the present invention can be applied to a press-fitting device for other parts.

[0025]

According to the present invention, as described above, the cylinder inner diameter of the side (upper cylinder) of the backup cylinder and the press-fitting cylinder that presses the workpiece against the reference surface is made slightly larger than the other cylinder. Since the working cylinder chambers of both cylinders are connected to each other during the process, the work can always be pressed against the pallet even if pressure fluctuations occur due to resistance fluctuations during press fitting.
There is no need to provide a special mechanism for the transport pallet, so that the cost of the pallet can be reduced, and it is possible to easily cope with many types of pallets.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of a press-fitting device of the present invention.

FIG. 2 is a control hydraulic circuit diagram of the press-fitting device of the present invention.

FIG. 3 is a diagram showing another embodiment of the present invention.

FIG. 4 is a control hydraulic circuit diagram in another embodiment.

FIG. 5 is an overall configuration diagram of a part press-fitting device.

FIG. 6 is a diagram showing a schematic configuration of a conventional part press-fitting device.

FIG. 7 is a diagram showing a schematic configuration of another embodiment of the conventional parts press-fitting device.

[Explanation of symbols]

 Reference Signs List 3 press-in cylinder 3a press-in punch 7 backup cylinder 7a backup rod 10 pallet 16 cylinder case 20 pressure oil pump 23 first switching valve 26 second switching valve 28 third switching valve

Claims (1)

(57) [Claims] 1. A part press-fitting device for supporting one surface of a work by a backup rod operated by a backup cylinder and press-fitting parts from the other surface of the work into the work by a press-fitting punch operated by a press-fitting cylinder. Of the backup cylinder and the press-fitting cylinder, the inside diameter of the cylinder that presses the workpiece against the reference surface is slightly larger than the inside diameter of the other cylinder, and the working-side cylinder chambers of both cylinders are communicated with each other during the press-fitting process. Parts press-fitting device.