JPS632238Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention provides a screwdriver that is screwed onto the screwnut by rotationally driving the screwnut that is rotatably mounted between the gear case and the lid of the gear case. The present invention relates to an improvement in a press press machine in which a screw shaft is moved in the axial direction of the screw shaft and pressurizes a press die with the screw shaft.

As shown in FIG. 5, a conventional press press machine of this type has oil passages 11 and 12 on the outer peripheral surfaces of the lid 5 and the screw nut 6, and a through hole 26 extending from the inside and outside of the screw nut 6. A sponge or the like is inserted into the through hole 26 to form an oil reservoir 27.
The lubricating oil of the gear part 9 housed in the gear case 4 was configured to be supplied to the sliding part of the screw nut 6 and the lid body 5, and the threaded part of the screw nut 6 and the screw shaft 10. .

This press press machine is much better than the old press press machine, which applied grease at the time of assembly and then oiled only the areas that could be lubricated from the outside during maintenance and inspection. The consumption of lubricating oil is surprisingly large, and when used for a long time, the lubricating oil in the gear case 4 runs out and seizes, so it has to be replenished frequently. This is because the screw shaft 10 passes through the screw nut 6, and the lubricating oil in the gear case 4 adheres to the male threaded portion of the screw shaft 10 and is gradually carried away to the outside. Therefore, by sealing the sliding surfaces between the screw shaft 10 and the screw nut 6, it is possible to prevent the oil from being discharged by the screw shaft 10. However, in the conventional structure, the oil that protrudes to the outside of the screw shaft 10 can be prevented from being discharged. Since the connecting part is male threaded, it is extremely difficult to achieve a complete seal.

The present invention provides a press that is improved in this respect.

Hereinafter, embodiments of the present invention will be described based on the drawings.

FIG. 1 shows a press device using a press press A according to the present invention, in which 1 is a fixed frame, which has an upper frame 1a and a lower frame 1b facing each other;
The upper mold mounting member 2, on which the upper press mold (not shown) is attached, is moved up and down with the press press A fixed on the lower surface of the lower frame 1b with respect to the lower press mold (not shown) provided on the upper surface of the lower frame 1b. It is configured as follows. 3 is a rotation stopper.

The press press A is configured as follows.

That is, as shown in FIGS. 2 and 3, a screw nut 6 is rotatably mounted over the gear case 4 and its lid 5 with both upper and lower ends protruding. . 7 and 8 are thrust bearings, and 9 is a gear portion that rotationally drives the screw nut 6. In this embodiment, it is composed of a worm 9a mounted on the gear case 4 and a worm wheel 9b fixed to the screw nut 6. be. The female thread 6a of the screw nut 6 is provided over the entire length of the screw nut 6 except for the lower end, and only the inner surface of the lower end is formed to be smooth. 1
0 is a screw shaft having a male thread 10a which is shorter than the female thread 6a only at the upper end, and a pair of key grooves at the lower end to form the connecting part 10b of the upper die mounting member 2; Since rotation is prevented by the rotation stopper 3, the screw nut 6
By rotating the , it is possible to move up and down in the axial direction.

Reference numeral 12 denotes an oil passage provided on the outer peripheral surface of the screw nut 6, through which lubricating oil (the oil level position is indicated by ○) stored in the gear case 4 is connected to the outer peripheral surface of the screw nut 6. It is configured to be supplied to a sliding portion with the lid body 5. 13 and 14 are
A seal ring is interposed between the screw nut 6, the gear case 4, and the lid 5, a plug 15 closes the oil drain hole, and an oil level gauge 16 that displays the amount of oil in the gear case 4.

A lubrication system for the threaded portion between the female thread 6a and the male thread 10a is independent from the lubrication system for the outer peripheral surface of the screw nut 6 and the gear portion 9, and has the following structure.

That is, a cap 17 is attached to the upper end of the screw nut 6 by screw fitting, and this screw fitting portion is sealed with an O-ring 18, while the inner surface of the lower end of the screw nut 6 and the screw shaft 10 are sealed.
O-rings 19a, 19b and a seal ring 20 are used to seal between the cap 17 and the smooth side surface on the lower end side of the cap 17, so that an appropriate amount of lubricating oil (the oil level is indicated by a circle) can be contained in the cap 17. It is configured.
At the upper end of the screw shaft 10, there is an oil passage 2 for oil release, which has one end opening on the shaft end surface and the other end opening on the shaft side surface below the male thread 10a.
1 is provided to prevent the pressure of lubricating oil between the screw nut 6 and the shaft side surface below the male thread 10a from rising when the screw shaft 10 is lowered.

Therefore, the threaded part between the male screw 10a and the female thread 6a is constantly immersed in lubricating oil, and the threaded part and gear part 9 have separate lubrication systems, and The side surface of the shaft below the male thread 10a is smooth, and the oil passage 21 prevents pressure from rising when the shaft descends, so the sealing effect of the seal ring 20 and the like is high, and the gear case 4 and cap 17 It is possible to suppress consumption of the lubricating oil contained therein (taking it out to the outside by the screw shaft 10).

In FIG. 2, 22 is a stopper with an air vent hole, which can also serve as a fuel filler stopper. 23 is a blind plug for closing an oil drain hole provided at the lower end of the screw nut 6, 24 is a guide ring of the screw shaft 10, and 25 is a cover ring.

In this embodiment, as shown in FIG. 4, the tooth bottoms of the male thread 10a and the female thread 6a are machined deeper than the standard tooth profile, thereby increasing the top clearance a and allowing the delubrication oil to circulate. Although consideration has been made to make it easy to use, this is not an essential configuration for the present invention. Further, in this embodiment, a plug 22 is provided in the cap 17 in order to connect the upper die mounting member 2 to the lower end of the screw shaft 10. It goes without saying that the press can be used upside down by changing each to a blind plug.

The present invention has the above-mentioned configuration, and includes a lubrication system for the outer peripheral surface of the screw nut and the gear part,
The lubrication systems for the threaded joints between the female thread of the screw nut and the male thread of the screw shaft are independent of each other, and a sufficient amount of lubricating oil can be stored in the cap, reducing replenishment periods. In addition to being able to increase the length, the gap between the screw shaft and the screw nut is sealed by the smooth shaft portion on the side, and the screw shaft itself has an oil passage that bypasses the male screw. Since the pressure of the lubricating oil is prevented from increasing as the shaft goes up and down, it has a high sealing effect, and the lubricating oil stored in the gear case or cap will stick to the male screw of the screw shaft and be taken out. There is no wear and tear. Further, since the threaded portion is always immersed in lubricating oil, the lubricating oil is automatically and reliably supplied to the threaded portion.

Therefore, the press according to the present invention can be operated for a long period of time without replenishing lubricating oil.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a front view of a press using a press according to the present invention, Fig. 2 and Fig. 3 are a partially cutaway front view and a partially cutaway bottom view of the press, Fig. 4 is an enlarged view of the main part, and Fig. 5 is a partially cutaway front view of a conventional example. 4... Gear case, 5... Cover, 6... Screw nut, 6a... Female screw, 9... Gear part, 1
0...screw shaft, 10a...male thread,
10b: connecting portion; 17: cap; 20:
Seal ring, 21...oil passage.

Claims (1)

[Scope of utility model registration request] A screw nut is mounted on a shaft between a gear case and a lid of the gear case so that it can only rotate freely,
The screw nut is configured to be rotationally driven by a gear part built into the gear case, and a male thread is provided at only one end to engage with a female thread of the screw nut, and the side surface of the other part is smoothed. west,
and a screw shaft having a press-type connecting portion formed at the other end thereof is inserted into the screw nut, and the gear case stores lubricating oil for the outer circumferential surface of the screw nut and the gear portion, A cap is attached in an oil-tight manner to one end of the screw nut corresponding to the male thread end of the screw shaft, and a cap is attached to the inner surface of the other end of the screw shaft corresponding to the screw shaft. A seal ring is provided between the screw shaft and the smooth side surface, and the screw shaft further includes:
A press press machine characterized in that an oil passage bypassing the male screw is bored, and lubricating oil for the threaded portion of the male screw and female screw is stored in the cap in a separate room from the gear case. .