JP2006105372A - Lubrication monitoring device for slide bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lubrication monitoring device for a slide bearing capable of preventing poor lubrication and capable of preventing seizure of the slide bearing. <P>SOLUTION: The lubrication monitoring device for the slide bearing is provided with a bearing metal 10 having an oil groove 10d, a bearing support part S holding the bearing metal 10, a check valve 25 for allowing supply and obstructing delivery of the lubricating oil to/from a lubricating oil supply passage 20 formed in the bearing support part S so as to communicate with the oil groove 10d, a lubricating oil pressure sensor 41 for detecting a pressure in the lubricating oil supply passage 20, and a pressure monitor 43 for monitoring a lubricating oil pressure. The check valve 25 obstructs delivery of the lubricating oil from the oil groove 10d when the load is applied, and thereby the state of the oil film on the inner surface of the bearing metal 10 can be accurately determined based on the lubricating oil pressure. The load timing can be determined by a detection value of a load sensor 42, the lubricating oil pressure at the time of application of the load can be grasped by the pressure monitor 43, and therefore, measures for supply of the lubricating oil can be taken in advance, and seizure preventing effect of the slide bearing can be enhanced. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a lubrication monitoring device for a sliding bearing. More specifically, the present invention relates to a lubrication monitoring device for a sliding bearing that can be used for monitoring the lubrication state of the sliding bearing and preventing seizure.

The mechanical structure of the crank press includes a crown 1, a frame 2, a bed 3, and a slide 4 as shown in FIGS. 4 and 5. A bed called a bolster is placed on the bed 3, the lower mold M <b> 1 is fixed to this, and the upper mold M <b> 2 is fixed to the lower surface of the slide 4.
The energy from the motor is stored as the rotational kinetic energy of the flywheel 5, and the energy required for forging is transmitted to the slide 4 via the clutch 6, the crankshaft 7, and the connecting rod 8, and the upper die rolls the material on the lower die. (Non-Patent Document 1).
The bearings such as the crankshaft 7, the connecting rod 8, the wrist pin 9 and the like use a slide bearing having a bearing metal 10 as an element. As shown in FIG. 6, oil or grease fed from a pump 101 is used. The piping 103 from the distribution valve 102 supplies oil to the inner surface of the bearing metal 10 of the slide bearing PB (Non-patent Documents 2 and 3).

By the way, each time the press operation is performed, the crank press applies a load to the slide bearing PB. At this time, the lubricating oil is compressed and the pressure in the pipe 103 increases. In order to prevent malfunction due to the increased pressure and to protect the distribution valve 102, a check valve 104 and a relief valve 105 are installed in the piping.
Relieving the pressure boosted at the time of load by the relief valve 105 is effective for protecting the piping system, but since the lubricating oil escapes from the slide bearing PB, poor lubrication tends to occur. The temperature around the bearing metal 10 can be detected by the temperature sensor, and the lubrication failure can be known by the temperature rise. However, since the lubrication failure has already progressed when the temperature rises, the prevention of seizure should be fundamentally solved. I can't.
If the sliding bearing of the forging press is seized due to poor lubrication, it takes a lot of time and money to recover.

"Forging" pp. 324-325 August 30, 1995 First edition published. Japan Society for Technology of Plasticity published by Corona Co., Ltd. "Press processing manual" pages 75-76, published on October 25, 1975 Maruzen Co., Ltd., Japan Society for Technology of Plasticity "Revised Press Machines Revised Edition", pages 73-74, 2nd edition issued on October 1, 2001 by Aida Press Study Group Japan Machinist Co., Ltd.

  In view of the above circumstances, an object of the present invention is to provide a lubrication monitoring device that can prevent poor lubrication and prevent sliding bearings from being seized.

A lubrication monitoring device for a slide bearing according to a first aspect of the present invention is a slide bearing comprising a bearing metal in which an oil groove is formed and a bearing support portion that holds the bearing metal, and is provided in the bearing support portion so as to communicate with the oil groove. A lubricating oil pressure that detects the lubricating oil pressure between the oil groove and the check valve is installed in the formed lubricating oil supply passage to allow the supply of lubricating oil and to prevent discharge. A sensor is provided.
A sliding bearing lubrication monitoring device according to a second aspect of the present invention is characterized in that, in the first aspect of the invention, a pressure monitor is provided which takes in the detected value of the lubricating oil pressure sensor and monitors the lubricating oil pressure.
The lubrication monitoring device for a slide bearing according to a third aspect of the present invention is that in the second aspect of the invention, a load sensor is provided for detecting the pressure application timing to the slide bearing, and the detection of the load sensor is incorporated into the pressure monitor. Features.

According to the first invention, by attaching a check valve to the lubricating oil supply path in the bearing support portion, it is possible to prevent the lubricating oil from being discharged from the inner surface of the bearing metal under load. For this reason, the state of the oil film on the inner surface of the bearing metal can be accurately determined based on the pressure in the lubricating oil supply passage.
According to the second aspect of the invention, since the lubricating oil pressure in the slide bearing at the time of loading can be detected by the lubricating oil pressure sensor, the lubricating state at the time of loading can always be grasped by the pressure monitor. For this reason, since countermeasures such as supply of lubricating oil can be taken in advance according to the monitor result, the effect of preventing sliding bearing sliding is enhanced.
According to the third invention, since the load timing can be determined from the detection value of the load sensor, the detection result of the lubricating oil pressure sensor can be accurately evaluated, and the monitoring accuracy is increased.

Next, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic explanatory diagram of a lubrication monitoring device for a sliding bearing according to an embodiment of the present invention. 2A and 2B show a plain bearing structure according to the embodiment, wherein FIG. 2A is a perspective view and FIG. 2B is a cross-sectional view. 3A is a lubricating oil pressure waveform diagram when lubrication is normal, and FIG. 3B is a lubricating oil pressure waveform diagram when lubrication is defective.

First, the structure around the slide bearing PB will be described with reference to FIG.
10 is a bearing metal, and S is a bearing support. The bearing metal 10 is a known cylindrical bearing member made of bronze, white metal, or the like. An oil groove 10d having an arbitrary shape is formed on the sliding surface 10a on the load side, and communicates with the oil groove 10d. An oil hole 10h is also formed. Although not shown in the drawing, the bearing metal 10 may be an integral type or divided into two or four parts for easy replacement, and the shape of the split metal can be arbitrarily determined.
The bearing support S is a member that supports the bearing metal 10 and may be of any shape and structure depending on the application location of the bearing. For example, in the case of the crank press wrist pin 9 and the crankshaft 7, the connecting rod 8 corresponds to the bearing support portion S. Note that J indicated by an imaginary line is an axis such as the wrist pin 9 or the crankshaft 7.

Inside the bearing support S, a lubricating oil supply path 20 is formed. The illustrated lubricating oil supply path 20 includes a vertical hole 21 and a horizontal hole 22, but is not limited thereto, and may be one, and the direction of the hole may be arbitrary.
A check valve 25 is attached in the lubricating oil supply passage 20. The shape and structure of the check valve 25 itself may be arbitrary, and a known one may be selected and used according to the size and shape of the application location.
The illustrated check valve 25 is configured such that a valve element 27 is urged against a valve seat in a valve case 26 by a spring 28. The check valve 25 may be inserted in any direction as long as it allows the supply of lubricating oil but prevents the discharge. The closer the check valve 25 is to the mounting position of the oil groove 10d of the bearing metal 10, the better.

  In the above embodiment, even if a load is applied to the slide bearing PB, the lubricating oil on the inner surface of the bearing metal 10 is sealed by the check valve 25, and therefore does not escape to the supply pipe 33 side described later. Lubricating oil oozes out from both ends of the bearing metal 10 to the outside, but since it is slight, it is possible to grasp the exact lubricating state by detecting the lubricating oil pressure between the check valve 25 and the oil groove 10d. be able to.

Next, the lubrication monitoring device will be described with reference to FIG.
A pump 31, a distribution valve 32, and a supply pipe 33 are provided as a lubricating oil supply system for the slide bearing PB. The supply pipe 33 is connected to the entry side of the check valve 25 provided in the bearing support portion S.

And the following structure is provided as a lubrication monitoring apparatus.
A lubricating oil pressure sensor 41 that detects the oil pressure is connected between the oil groove 10d and the check valve 25 to the lubricating oil supply passage 20 in the bearing support S. As long as this lubricating oil pressure sensor 41 can detect the pressure of lubricating oil correctly, what kind of sensor may be used. Further, a load sensor 42 for detecting a load is attached to an appropriate position of the bearing support portion S. The load sensor 42 may be any sensor that can detect the timing of pressure fluctuation using a strain gauge or the like.
The pressure sensor 41 and the load sensor 42 are connected to the pressure monitor 43 so as to continuously take in the detection values of both the sensors 41 and 42.

The pressure monitor 43 has a function of displaying the pressure fluctuation by an appropriate display method such as a pressure waveform graph and numbers shown in FIG. 3 based on a signal taken from the lubricating oil pressure sensor 41. In addition, it has a function to notify an alarm based on pressure fluctuation and a lubricating oil supply timing. The pressure monitor 43 may be an independent single monitor or may incorporate functions necessary for various instrumentation devices.
A temperature sensor 44 measures the temperature around the bearing metal 10.

  The above-described lubrication monitoring device can be applied to plain bearings everywhere in the crank press. Typical application examples include sliding bearings at both ends of the crankshaft 7, a connecting portion between the crankshaft 7 and the connecting rod 8, and a wrist pin 9 that connects the connecting rod 8 and the slide 4.

Next, a monitoring method when the lubrication monitoring device of FIG. 1 is applied to any of the above-described plain bearings of the crank press will be described.
FIG. 3 is a view showing the pressure in the lubricating oil supply passage 20 at the time of stamping of the press by the pressure sensor 41 and represented by a pressure waveform. When the crank press starts to stamp, the stamping reaction force acts on the slide bearing, and the lubricating oil is compressed, so the pressure rises. When the stamping is finished, the pressure acting on the lubricating oil is released, so the pressure drops. Therefore, as shown in FIG. (A), when the lubrication state is normal, the pressure waveform Pn rises rapidly with the start of punching, and after reaching the peak, when the upper and lower molds start to move away, they drop rapidly. Go. The waveform approximates a substantially symmetrical isosceles triangle. On the other hand, in the case of poor lubrication shown in FIG. (B), the pressure waveform Pj rises with the start of stamping, but the rise angle is slow, the height is low, and the peak shape is complicated with a series of small peaks. It becomes a shape.
It is the peak height that shows a clear difference between normal and poor lubrication, and it is possible to predict poor lubrication by grasping the state in which the peak height gradually decreases.
In addition, since the timing of the start and end of stamping can be accurately recognized by comparing with the detection signal of the load sensor 42, the pressure waveform can be analyzed accurately.

  Although the said embodiment was the example applied to the one part bearing of a crank press, it can apply to any of the slide bearings of places other than the above. Moreover, there is no restriction | limiting in the kind of press which can be applied, It can apply to any type of press. Further, the present invention is applicable not only to presses but also to plain bearings in all technical fields.

It is a schematic explanatory drawing of the lubrication monitoring device of a slide bearing concerning one embodiment of the present invention. The plain bearing structure in the same embodiment is shown, (A) is a perspective view, (B) is a cross-sectional view. (A) is a lubricating oil pressure waveform diagram when lubrication is normal, and (B) is a lubricating oil pressure waveform diagram when lubrication is poor. It is a schematic block diagram of a crank press. FIG. 5 is a side view around the connecting rod shown by line VV in FIG. 4. It is a schematic explanatory drawing which shows the conventional slide bearing structure.

Explanation of symbols

10 Bearing metal
10d Oil groove 20 Lubricating oil supply path 25 Check valve 41 Lubricating oil pressure sensor 42 Load sensor 43 Pressure monitor

Claims (3)

In a slide bearing comprising a bearing metal in which an oil groove is formed and a bearing support that holds the bearing metal,
A check valve is attached to the lubricating oil supply passage formed in the bearing support portion so as to communicate with the oil groove so as to allow the supply of the lubricating oil and prevent the discharge.
A lubrication monitoring device for a slide bearing, comprising a lubricant pressure sensor for detecting a lubricant pressure between the oil groove and the check valve. 2. The lubrication monitoring device for a slide bearing according to claim 1, further comprising a pressure monitor that takes in a detection value of the lubricant pressure sensor and monitors the lubricant pressure. 3. The lubrication monitoring device for a slide bearing according to claim 2, wherein a load sensor for detecting a pressure application timing to the slide bearing is provided, and the detection of the load sensor is taken into the pressure monitor.

Images