JP5548659B2 - Lubricant recovery device for press machine - Google Patents

Description

  The present invention relates to a lubricant recovery device for a press machine. More specifically, the present invention relates to a lubricant recovery device that prevents scattering of the lubricant and recovers the lubricant.

  Conventionally, an oil fence prevents the lubricant flowing out from the eccentric shaft of the press device from being scattered. FIG. 7 is a partial cross-sectional view of a C-type press as viewed from the front. The press machine includes an eccentric shaft 30, a connecting rod 31 that is rotatably connected to the eccentric shaft 30, and a slide 32 that is connected to the lower end of the connecting rod 31. A cylindrical oil fence 33 is provided on the slide 32. The cylindrical oil fence 33 has a lower end fixed to the slide 32, accommodates the connecting rod 31 therein, and an upper end extends to the middle of the connecting rod 31. The cylindrical oil fence 33 moves up and down together with the slide 32. On the other hand, two plate-like oil fences 34, 34 are attached to the top surface of the press. The plate-shaped oil fences 34, 34 are suspended from the ceiling of the press, are arranged on both sides of the eccentric shaft 30 and the connecting rod 31, and extend in a direction perpendicular to the paper surface. The lower end of the plate-shaped oil fence 34 extends to the middle of the cylindrical oil fence 33. A strip-shaped oil fence 35 is attached so as to connect the lower ends of the left and right plate-shaped oil fences 34. The strip-shaped oil fence 35 slides with the front surface of the cylindrical oil fence 33 on the inner surface of the slide 32 as the slide 32 moves up and down. These oil fences 33, 34, and 35 receive the scattered lubricant, flow the received lubricant down the plate surface of each fence, and collect it near the slide. On the other hand, the material that travels down from the eccentric shaft 30 through the connecting rod 31 without being scattered is collected together in the vicinity of the slide 32.

  As an apparatus for efficiently collecting the lubricant, there is an apparatus of Patent Document 1. The apparatus includes an eccentric shaft pivotally supported by a journal bearing portion, and a connecting rod (hereinafter referred to as a connecting rod) having a fitting hole fitted to an eccentric portion thereof. A bearing metal is provided between the inner surface of the fitting hole of the connecting rod and the outer surface of the eccentric portion, and lubricating oil is supplied to the inner surface of the bearing metal. A ring for preventing lubricant scattering is attached to the open end of the fitting hole of the connecting rod. An annular oil groove is formed on the inner periphery of the lubricating oil prevention ring (hereinafter, ring). In addition, a notch groove is formed near the lower end of the ring to communicate the inside and the outside of the annular oil groove. This ring prevents the lubricating oil from splashing in the eccentric direction from the side end of the eccentric part of the eccentric shaft, and guides the lubricating oil along the oil groove to the notch groove at the lower end, from which the lubricating oil flows downward. Let The spilled lubricating oil flows downward along the connecting rod, is collected on the slide side, and is collected there.

  As another technique, there is a technique in which a plunger is connected to the small end portion of the connecting rod and a slide is connected to the lower end thereof. In this device, a partition frame is arranged near the middle of the plunger in the axial direction (near the top of the slide), and a plunger guide for guiding the vertical movement of the plunger is provided on the partition frame. By providing this partition frame, the portion above it, that is, the vicinity of the large end of the connecting rod that becomes the outflow source of the lubricant, is surrounded by a frame and sealed, and the lubricant is placed outside the enclosed sealed region. It is prevented from scattering.

JP-A-10-109249

  Even if the oil fence is provided, since the vicinity of the fitting hole of the connecting rod is not covered, the lubricant scatters over a wide range, and the lubricant tends to flow out from somewhere. The scattered lubricant flows downward along the oil fence or connecting rod (in Patent Document 1, it flows along the connecting rod from the notch groove) and is collected together on the lower slide side. For this reason, since the dirt adhering to the connecting rod and the dirt accumulated on the slide are collected together with the lubricant on the slide side, the lubricant becomes dirty. On the other hand, when the plunger is provided, the connecting rod can be sealed, but the connecting rod becomes longer in the height direction, and the total height of the apparatus is increased. This increases the manufacturing cost.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a lubricant recovery device that can prevent the lubricant from flowing out while having a simple, inexpensive, and easily manufactured structure.

  The lubricant recovery device of the present invention (Claim 1) includes an eccentric shaft that is rotationally driven, a connecting rod that is pivotally supported by an eccentric portion of the eccentric shaft, a large end portion of the connecting rod, and the eccentric portion. A lubricant recovery device for a press machine comprising a bearing interposed between the bearing and a lubricant supply means for supplying a lubricant to the bearing, wherein the web portion of the eccentric shaft extends from the periphery of the fitting hole of the connecting rod. A cylindrical guide plate extending outward to cover the side periphery is provided.

In such a lubricant recovery device, the guide plate is cylindrical with the central axis of the eccentric portion as an axis, and the cross-sectional shape perpendicular to the central axis of the guide plate is a web based on the rotational motion of the eccentric shaft. A shape that slides with the side periphery of the portion is preferred (Claim 2). A shelf plate for receiving a lubricant provided below the open end of the guide plate;
It is preferable that a vertical wall provided opposite to the opening of the guide plate is provided, and an inner surface of the vertical wall is continuous with the shelf plate.

  In the lubricant recovery device and the press machine of the present invention (claim 1), the lubricant flows out of the bearing and scatters to the surroundings by the centrifugal force due to the rotational movement of the eccentric shaft. The guide plate is provided in the periphery of the fitting hole into which the bearing is fitted, and regulates the direction in which the lubricant scatters, so that the scattering range can be narrowed. Further, since the guide plate rotates together with the connecting rod about the axis of the eccentric shaft as the central axis, the guide plate is always arranged in the vicinity of the outflow location of the lubricant during the movement of the connecting rod. For this reason, the range of scattering of the lubricant can be further narrowed. Further, since the lubricant scattering direction can be guided in the direction in which the guide plate is opened, the recovery can be performed efficiently. In addition, the splashing lubricant is prevented from splashing around the connecting rod, and it is difficult for the lubricant to touch the connecting rod, so the lubricating slip is not soiled.

  In such a lubricant recovery device, the guide plate is cylindrical with the central axis of the eccentric portion as an axis, and the cross-sectional shape perpendicular to the central axis of the guide plate is a web based on the rotational motion of the eccentric shaft. In the case of a shape that slides with the side periphery of the portion (Claim 2), the movement range of the guide plate can be reduced, and thus the space is saved. Further, since the moving range of the guide plate is small, the range in which the lubricant is scattered is also small.

A shelf plate for receiving a lubricant provided below the opening end of the guide plate; and a vertical wall provided to face the opening of the guide plate, the inner surface of the vertical wall being continuous with the shelf plate. In this case (Claim 3), the lubricant flowing out from the opening end of the guide plate can be efficiently recovered. In addition, it is possible to partition a portion where the lower slide or the like is disposed from a place where the lubricant is disposed where the upper eccentric shaft or the like is disposed. And it is prevented that a lubricant adheres to the said plate-shaped flame | frame which opposes, and it disperses in another place. The adhered lubricant flows downward along the vertical wall and can be collected by the shelf board.

FIG. 1 is a front view showing a press machine in which the lubricant recovery device of the present invention is used. 2 is a cross-sectional view taken along the line II of FIG. 3 is a cross-sectional view taken along line II-II in FIG. 4 is a partially enlarged cross-sectional view showing the eccentric shaft, connecting rod and guide plate of FIG. FIG. 5 is a partially enlarged cross-sectional view showing a state when the connecting rod is at the bottom dead center. FIG. 6 is a schematic view showing how the connecting rod and the guide plate rotate. FIG. 7 is a partial cross-sectional view showing a conventional lubricant recovery device.

  First, a press machine in which the lubricant recovery device of the present invention is used will be described with reference to FIG. A press machine 1 shown in FIG. 1 includes left and right side frames, a front frame 2a provided on an upper portion of the front surface of the side frame, and a bed 3 fixed below the side frame. A bolster 4 is mounted on the bed 3. As the side frame, a C-shaped side frame, a straight side frame, or the like is used.

  As shown in FIG. 2, journal bearings 5 and 5 are provided on the front frame 2 a and the intermediate frame 2 b disposed behind the front frame 2 a, and the journal bearings 5 and 5 have front and rear ends of an eccentric shaft (crank shaft) 6. Is supported rotatably. A main gear 7 is provided at the rear end of the eccentric shaft 6, and a driving force from a motor (reference numeral 8 in FIG. 1) is transmitted via a flywheel, a clutch, a pinion gear, and the like (not shown). An eccentric portion 6b is provided near the center of the eccentric shaft 6 via a web portion 6a, and a connecting rod 9 is connected to the eccentric portion 6b. The upper opening between the front frame 2a and the intermediate frame 2b is closed by an oil scattering prevention lid 27. A combination of the front frame 2 a and the intermediate frame 2 b is a vertical wall 2.

  The web portion 6a is a portion connecting the main body (shaft portion) of the eccentric shaft 6 and the eccentric portion 6b. In this embodiment, the outer periphery of the web portion 6a is cut obliquely from the main body toward the eccentric portion 6b. However, the web portion 6a may have a shape that is straight from the main body in the radial direction. The side periphery of the web portion 6a is an outer edge in a cross-sectional shape perpendicular to the axis P of the eccentric portion 6b.

  A fitting hole 9b is formed in the large end portion 9a above the connecting rod 9, and the sliding bearing 10 is fitted to the inner surface of the fitting hole 9b. The connecting rod 9 is pivotally supported around the eccentric portion 6 b of the eccentric shaft 6 by the slide bearing 10. A rolling bearing may be used instead of the sliding bearing. On the other hand, a slide 11 is connected to the lower side (small end portion) of the connecting rod 9 via a ball joint 11a. The slide 11 is guided to move up and down by a slide give attached to the frame. An upper mold 12 is attached to the lower surface of the slide 11. A lower mold 13 is attached to the upper surface of the bolster 4.

  The rotational force of the motor 8 rotates the eccentric shaft 6 via the main gear 7. As a result, the eccentric portion 6 b rotates around the axis O of the eccentric shaft 6. The connecting rod 9 whose upper end is pivotally supported by the eccentric portion 6b slides with the peripheral surface of the eccentric portion 6b on the inner surface of the sliding bearing 10 in the fitting hole 9b at the upper end. On the other hand, the lower end of the connecting rod 9 moves up and down to move the slide 11 up and down.

As shown in FIG. 4, a lubricant supply port 14 is formed near the base of the large end 9 a of the connecting rod 9. The supply port 14 extends upward in the axial direction inside the connecting rod 9 and communicates with a lubricant supply path 15 extending in parallel with the eccentric shaft 6 on the way. A portion of the supply passage 15 extending in parallel with the eccentric shaft 6 branches off from the middle, penetrates the sliding bearing 10 and communicates with the inside thereof. On the peripheral surface of the eccentric portion 6 b of the eccentric shaft 6 and the inner surface of the sliding bearing 10, an oil film is formed by a lubricant supplied from the supply port 14 via the supply path 15. The supply port 14 and the supply path 15 are lubricant supply means 16. A device for supplying a lubricant (not shown) is connected to the supply port 14.

  The lubricant recovery device 17 (see FIG. 2) of the present invention includes a guide plate 18 disposed so as to cover the side periphery of the web portion 6 a of the eccentric shaft 6 from the vicinity of the fitting hole 9 b of the connecting rod 9. The guide plate 18 extends outward, that is, toward the shaft end side of the eccentric shaft 6. When the eccentric shaft 6 rotates, the guide plate 18 moves with the large end portion 9a of the connecting rod 9 about the rotational axis O (see FIGS. 4, 5 and 6).

  The guide plate 18 has a flange portion 19 attached to the periphery of the fitting hole 9b, a taper portion 20 extending outwardly from the flange portion 19, and continuously parallel to the eccentric shaft 6 continuously from the taper portion 20. And a cylindrical portion 21 that extends. The overall shape of the guide plate 18 is a so-called trumpet shape with the central axis P of the eccentric portion 6b of the eccentric shaft 6 as the axis. And the trumpet shape is a shape along the envelope on the radially outer side drawn by the rotational movement of the eccentric shaft 6. For this reason, since the range which the guide plate 18 moves can be made small, it is space-saving. In the present embodiment, the separate guide plate 18 is attached to the large end portion 9 a of the connecting rod 9, but it may be provided integrally with the connecting rod 9. The material of the conductive plate 18 is a metal such as iron, stainless steel or aluminum alloy, and may be a synthetic resin having a strength capable of withstanding the centrifugal force caused by the rotation of the connecting rod 9.

  The flange portion 19 is a bowl-shaped member joined to the large end portion 9a of the connecting rod 9 by a fastener such as a screw. The tapered portion 20 may be directly attached to the periphery of the fitting hole 9b of the connecting rod 9 without providing the flange portion 19.

  The tapered portion 20 gradually increases in opening diameter from the connecting rod 9 toward the shaft end side of the eccentric shaft 6. In the present embodiment, the diameter of the tapered portion 20 is increased in direct proportion to the axial length toward the opening end. Note that the amount of diameter expansion may be increased or decreased abruptly or exponentially so as to form a trumpet shape or to be continuously connected to the cylindrical portion 21 smoothly. Further, a substantially flat portion or a portion in which the amount of diameter expansion is reduced may be provided in the middle of the tapered portion 20 to form a substantially stepped shape.

  The cylindrical portion 21 finally determines the direction in which the lubricant is scattered. For this reason, the cylindrical shape is made substantially parallel to the eccentric shaft 6 so that the lubricant does not scatter in a wide range and does not scatter the connecting rod 9 or the slide 11 by scattering to the connecting rod 9 side. The cylindrical portion 21 may not be parallel to the eccentric shaft 6 but may have a tapered shape with a smaller angle with respect to the eccentric shaft 6 than the tapered portion 20 on the cut surface including the axial center of the guide plate 18. Further, the inner diameter of the tapered portion 20 may be reduced smoothly to form the cylindrical portion 21. The cylinder portion 21 may not be provided. This is because, for example, when the front frame 2a and the intermediate frame 2b are brought close to the opening end of the guide plate 18, the scattering range of the lubricant can be narrowed.

The direction in which the lubricant that has flowed out of the sliding bearing 10 scatters is regulated by the guide plate 18. That is, since the lubricant is likely to be scattered in the direction in which the plate surface of the cylindrical portion 21 is extended, the lubricant can be guided in that direction. The guide plate 18 is provided around the fitting hole 9b of the connecting rod 9 into which the sliding bearing 10 is fitted, and rotates together with the connecting rod 9 about the axis O of the eccentric shaft 6. For this reason, since the guide plate 18 is always disposed in the vicinity of the outflow location of the lubricant during the up-and-down movement of the connecting rod 9, the range in which the lubricant scatters can be limited to a predetermined range. Moreover, since the guide plate 18 has the taper portion 20 whose diameter is increased outward, it is possible to prevent interference with the web portion 6a. Furthermore, the lubricant received on the inner surface of the taper portion 20 due to scattering moves to the opened end portion by the centrifugal force of the rotational motion, and flows out from there. For this reason, since the scattered lubricant is difficult to touch the connecting rod 9, it is possible to prevent the lubricating slip from becoming dirty.

  Returning to FIG. 2, a shelf 22 is attached to the front frame 2a. The shelf plate 22 is formed with a through hole 22a through which the connecting rod 9 passes. The shelf plate 22 is disposed between the large end 9a of the connecting rod 9 and the ball joint 11a to prevent the lubricant from flowing out to the slide 11 side. Then, the lubricant that falls from the opening end of the guide plate 18 is received by the shelf plate 22. On the side of the main gear 7 of the shelf plate 22, a storage recess 22b in which a lubricant is accumulated is formed. The storage recess 22b communicates with the discharge part 23 for recovering the lubricant. In this embodiment, the through-hole 22a is substantially rectangular, and the direction in which the eccentric shaft 6 extends is the short side (see FIGS. 2 and 3). The shape of the through hole 22a may be circular, oval or other rectangular shape.

  A cylindrical lubricant cover 24 is attached to the inner edge of the through hole 22a and extends vertically. The lubricant dampening cover 24 is cylindrical and has a flange 24a formed in the vicinity of being slightly lowered from the upper end. The flange 24a is connected to the shelf plate 22 at the flange 24a. Therefore, the upper part of the lubricant retaining cover 24 protrudes from the through hole 22a, and the protruding part prevents the lubricant from flowing into the through hole 22a. In the present embodiment, a plate material is applied to the lower surfaces of the shelf plate 22 and the flange 24a, and the plate material is fixed to both by a fastener such as a bolt. The cross section of the lubricant retaining cover 24 is also made substantially rectangular in accordance with the substantially rectangular through hole 22a. On the long side of the flange 24a, the flange 24a protrudes through the thick portion 24b (see FIG. 3).

  A connecting rod cover 25 is provided between the lubricant dampening cover 24 and the connecting rod 9. The connecting rod cover 25 is a cylindrical member extending upward and having a lower end joined to the upper surface of the slide 11 and containing the connecting rod 9 therein. The connecting rod cover 25 moves up and down together with the slide 11 and is disposed so as to be in sliding contact with the inner surface of the damming cover 24. In this embodiment, the cylindrical cross-sectional shape is a rectangle, but it may be a circular shape, a long hole shape, or another rectangular shape. The same applies to the lubricant damming cover 24.

  As shown in FIG. 3, an oil fence 26 is attached to the side edge on the short side of the shelf board 22. The oil fence 26 is continuous with the shelf plate 22 at the lower end, curves outward near the upper end of the connecting rod cover 25 so as to avoid interference with the guide plate 18, and extends almost straight upward from the curved portion. Yes. An upward opening formed by the oil fence 26, the front frame 2a and the intermediate frame 2b (see FIG. 2) is closed by an oil scattering prevention lid 27.

  The front frame 2a and the intermediate frame 2b provided at positions facing the opening of the guide plate 18 approach, for example, the extending direction of the plate surface of the cylindrical portion 21 so as to receive the lubricant scattered from the guide plate 18. Are preferably arranged. The lower ends of the front frame 2a and the intermediate frame 2b are continuous with the shelf plate 22, and the lubricant adhering to the front frame 2a and the intermediate frame 2b flows downward along the respective plate surfaces, Received by the plate 22. The shelf plate 22, the lubricant dampening cover 24 and the vertical wall 2 are a lubricant recovery device 17.

DESCRIPTION OF SYMBOLS 1 Press machine 2 Vertical wall 2a Front frame 2b Intermediate frame 3 Bed 4 Bolster 5 Journal bearing 6 Eccentric shaft 6a Web part 6b Eccentric part 7 Main gear 8 Motor 9 Connecting rod 9a Large end 9b Fitting hole 10 Bearing 11 Slide 11a Ball joint 12 Upper mold 13 Lower mold 14 Supply port 15 Supply path 16 Lubricant supply means 17 Lubricant recovery device 18 Guide plate 19 Flange portion 20 Taper portion 21 Tube portion 22 Shelf plate 22a Through hole 22b Storage recess 23 Discharge portion 24 Lubricant blocking cover 25 Connecting rod cover 26 Oil fence 27 Oil scattering prevention cover O Shaft center (eccentric shaft)
P shaft center (eccentric part)

Claims (3)

An eccentric shaft for rotational driving;
A connecting rod pivotally supported by the eccentric part of the eccentric shaft;
A bearing interposed between the large end of the connecting rod and the eccentric part;
A lubricant recovery device for a press machine comprising a lubricant supply means for supplying a lubricant to the bearing,
A lubricant recovery device for a press machine, comprising: a cylindrical guide plate extending outward from a peripheral edge of the fitting hole of the connecting rod so as to cover a side periphery of the web portion of the eccentric shaft. The guide plate has a cylindrical shape with the central axis of the eccentric portion as an axis;
The lubricant recovery device for a press machine according to claim 1, wherein a cross-sectional shape perpendicular to the central axis of the guide plate is configured to slide with a side periphery of the web portion based on the rotational movement of the eccentric shaft. A shelf plate for receiving a lubricant provided below the opening end of the guide plate;
A vertical wall provided opposite to the opening of the guide plate,
The lubricant recovery device for a press machine according to claim 1 or 2, wherein an inner surface of the vertical wall is continuous with the shelf board.

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