Servo press machine

Patent metadata

Field	Value
Publication number	US-11034116-B2
Application number	US-201816053449-A
Country	US
Kind code	B2
Filing date	Aug 2, 2018
Priority date	Aug 4, 2017
Publication date	Jun 15, 2021
Grant date	Jun 15, 2021

Abstract

A servo press machine includes an eccentric shaft, a connecting rod, a slide, an eccentric shaft-side sliding surface, a connecting rod-side sliding surface, an oil supply port, and a supply mechanism. The oil supply port opens on the eccentric shaft-side sliding surface or the connecting rod-side sliding surface, and supplies a lubricant between the eccentric shaft-side sliding surface and the connecting rod-side sliding surface. The supply mechanism supplies the lubricant to the oil supply port. The eccentric shaft-side sliding surface is formed on the eccentric shaft that is rotationally driven by a servomotor. The oil supply port is formed on the connecting rod-side sliding surface of the connecting rod that moves upward and downward due to the rotational driving of the eccentric shaft.

First claim

What is claimed is:

1. A servo press machine comprising:
an eccentric shaft which is rotationally driven by a servomotor, the eccentric shaft having an outer circumference surface;
a connecting rod which moves upward and downward due to the rotational driving of the eccentric shaft;
a sliding bearing disposed between the eccentric shaft and the connecting rod; and
a slide which moves upward and downward as the connecting rod moves upward and downward,
wherein the eccentric shaft has an eccentric shaft-side sliding surface which is the outer circumference surface of the eccentric shaft,
wherein the sliding bearing has a connecting rod-side sliding surface which slides with the eccentric shaft-side sliding surface, and the connecting rod-side sliding surface is an inner circumferential surface of the sliding bearing,
wherein the sliding bearing has an oil supply port, the oil supply port being disposed in the connecting rod-side sliding surface to supply a lubricant between the eccentric shaft-side sliding surface and the connecting rod-side sliding surface,
wherein the servo press machine further comprises a lubricant supply which supplies the lubricant to the oil supply port,
wherein when the servo press machine is in a press load period in which a workpiece is being pressed, (1) the eccentric shaft-side sliding surface and the connecting rod-side sliding surface press against each other to close the oil supply port by the eccentric shaft-side sliding surface, and (2) the lubricant supply supplies the lubricant to the oil supply port, closed by the eccentric shaft-side sliding surface, and pressurizes the lubricant during the press load period,
wherein when the servo press machine is not in the press load period, the lubricant supply supplies the pressurized lubricant between the eccentric shaft-side sliding surface and the connecting rod-side sliding surface from the oil supply port,
wherein the servo press machine further comprises an oil supply groove for supplying the lubricant, the oil supply groove being formed on the eccentric shaft-side sliding surface or the connecting rod-side sliding surface so as to extend over the entire eccentric shaft-side sliding surface or the entire connecting rod-side sliding surface, and
wherein the oil supply port opens in a region where the oil supply groove is not formed.

2. The servo press machine according to claim 1 ,
wherein the oil supply port includes an oil reservoir which has an opening area greater than an area of a cross section of an oil supply path extending toward the oil supply port.

3. The servo press machine according to claim 1 ,
wherein the oil supply port is formed in a region other than a portion which mostly receives force caused by a connecting rod tip section-side sliding surface and a connecting section-side sliding surface pressing against each other when the slide is at bottom dead center.

4. The servo press machine according to claim 1 ,
wherein the lubricant supply further comprises:
a distributor formed of a plurality of lubricant discharge blocks; and
a pump which delivers the lubricant to the distributor,

wherein each of the plurality of lubricant discharge blocks is connected to the oil supply port, and
wherein, when the oil supply port is closed during the press load period, the lubricant is pressurized by being discharged from the lubricant discharge blocks.

5. The servo press machine according to claim 1 ,
wherein the oil supply port includes an oil reservoir,
wherein the lubricant supply includes an oil supply path connected to the oil reservoir,
wherein an opening area of the oil reservoir is configured to be wider than an area of a cross section of the oil supply path.

6. A servo press machine comprising:
an eccentric shaft which is rotationally driven by a servomotor, the eccentric shaft having an outer circumference surface;
a connecting rod which moves upward and downward due to the rotational driving of the eccentric shaft;
a sliding bearing disposed between the eccentric shaft and the connecting rod; and
a slide which moves upward and downward as the connecting rod moves upward and downward,
wherein the eccentric shaft has an eccentric shaft-side sliding surface which is the outer circumference surface of the eccentric shaft,
wherein the sliding bearing has a connecting rod-side sliding surface which slides with the eccentric shaft-side sliding surface, and the connecting rod-side sliding surface is an inner circumferential surface of the sliding bearing,
wherein the sliding bearing has an oil supply port, the oil supply port being disposed in the connecting rod-side sliding surface to supply a lubricant between the eccentric shaft-side sliding surface and the connecting rod-side sliding surface,
wherein the servo press machine further comprises a lubricant supply which supplies the lubricant to the oil supply port,
wherein when the servo press machine is in a press load period in which a workpiece is being pressed, (1) the eccentric shaft-side sliding surface and the connecting rod-side sliding surface press against each other to close the oil supply port by the eccentric shaft-side sliding surface, and (2) the lubricant supply supplies the lubricant to the oil supply port, closed by the eccentric shaft-side sliding surface, and pressurizes the lubricant during the press load period,
wherein when the servo press machine is not in the press load period, the lubricant supply supplies the pressurized lubricant between the eccentric shaft-side sliding surface and the connecting rod-side sliding surface from the oil supply port, and
wherein a maximum pressure of the lubricant in the oil supply port during the press load period exceeds a force causing the eccentric shaft-side sliding surface and the connecting rod-side sliding surface to come into close contact with each other when the servo press machine is not in the press load period.

7. A servo press machine comprising:
an eccentric shaft which is rotationally driven by a servomotor;
a connecting rod which moves upward and downward due to the rotational driving of the eccentric shaft, the connecting rod having a tip section;
a slide which moves upward and downward as the connecting rod moves upward and downward;
a connecting section which connects the tip section of the connecting rod and the slide with each other; and
a sliding bearing disposed between the tip section of the connecting rod and the connecting section,
wherein the tip section of the connecting rod has a connecting rod tip section-side sliding surface which is a part of an outer circumferential surface of the tip section;
wherein the sliding bearing has a connecting section-side sliding surface which slides with the connecting rod tip section-side sliding surface, and the connecting section-side sliding surface is an inner circumferential surface of the sliding bearing,
wherein the sliding bearing has an oil supply port, the oil supply port being disposed in the connecting section-side sliding surface to supply a lubricant between the connecting rod tip section-side sliding surface and the connecting section-side sliding surface,
wherein the servo press machine further comprises a lubricant supply which supplies the lubricant to the oil supply port,
wherein when the servo press machine is in a press load period in which a workpiece is being pressed, (1) the connecting rod tip section-side sliding surface and the connecting section-side sliding surface press against each other to close the oil supply port by the connecting rod tip section-side sliding surface, and (2) the lubricant supply supplies the lubricant to the oil supply port, closed by the connecting rod tip section-side sliding surface, and pressurizes the lubricant du

Assignees

• Aida Eng Ltd

Inventors

• Koshimizu Takashi

Classifications

• F16N3/08

  incorporating a piston-pump · CPC title

• F16N7/22

  shaped as rings · CPC title

• B30B1/26 Primary

  by cams, eccentrics, or cranks · CPC title

• F16C33/1045

  Details of supply of the liquid to the bearing · CPC title

• F16C33/1025

  with liquid, e.g. oil, as lubricant · CPC title