JPH10180497A - Slide driving device of press machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a slide driving device of a press machine which is compact and in which the slide motion of the most suitable machining condition to an article to be pressed can be set arbitrarily. SOLUTION: A driving gear 7 on a driving shaft 6 is installed between a clutch 8 and a brake 9, a hydro-mechanical transmission(HMT) composed of a set of static hydraulic transmission(HST) 21 and an epicyclic gear device 31 is installed on the shaft end of the driving shaft 6, through this hydro- mechanical transmission(HMT), a fly wheel 11 transmitted with the power of a main motor and the driving shaft 6 are connected. The power of the main motor is transmitted to a crank shaft supported on a bearing member of a frame freely rotating and installing a main gear 4 on the shaft through the driving gear 7 installed on the driving shaft and a main gear 4 of engaging with this, and it moves a slide 10 up and down through a connecting rod 5 connected freely rotating to an eccentric part of the crank shaft.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slide drive device for a press machine provided with a hydromechanical transmission (HMT) for moving a slide up and down by an arbitrary slide motion.

[0002]

2. Description of the Related Art Conventionally, a slide drive device for a press machine includes a drive gear provided on a drive shaft by the power of a drive source, and an intermediate shaft having an intermediate gear that meshes with the drive gear directly or with the drive gear. Via a main gear that meshes via a pinion provided on the shaft, it is transmitted to a crankshaft or eccentric shaft instructed to be rotatable on a bearing member provided on the frame, and is rotatable on an eccentric portion of the crankshaft or eccentric shaft. There is a slide drive device that moves a slide up and down in a constant speed (sine) stroke through a connecting rod connected to the slide rod.

Further, there is a slide drive device which moves a slide up and down at an unequal speed (link) stroke by a slider mechanism such as Japanese Utility Model Publication No. 1-40634 or an eccentric link mechanism such as Japanese Patent Publication No. 3-73399. Further, there is a knuckle mechanism slide drive device that moves a slide up and down at an unequal speed (knuckle) stroke from a crankshaft via a set of powerful toggle mechanisms.

[0004] In addition, a slide drive device capable of arbitrarily changing a slide motion includes a device using a hydrostatic transmission (HST) and a device combining a hydrostatic transmission (HST) and a mechanical direct drive device. .

[0005]

In any of the above-mentioned mechanical slide drive devices, the slide motion cannot be changed in any of the slide drive devices, and a product of a large variety of small-quantity products can be manufactured under the optimum machining conditions. Press working with motion is not possible. In addition, a hydrostatic transmission (H
In the slide drive device using ST), it is necessary to transmit a large amount of energy (work) during a short press operation.
No large capacity pump / motor and large capacity pump / motor
The motor is expensive and has the drawback that the slide drive becomes large. Furthermore, a hydrostatic transmission (HS
T) and a mechanical drive unit, the slide drive unit has a hydrostatic transmission (HS) at low SPM.
T) At high SPM, there is a drawback that the advantage of the hydrostatic transmission (HST) cannot be utilized at high SPM because it is selectively used with the mechanical direct drive.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide a compact slide drive device for a press machine capable of arbitrarily setting a slide motion under optimum processing conditions for a product to be pressed.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a method of transmitting power of a driving source to a bearing member of a frame through a driving gear provided on a driving shaft and a main gear meshing with the driving gear. It is supported rotatably on the shaft and transmits to the crankshaft or eccentric shaft provided with the main gear on the shaft, and slides up and down via the connecting rod rotatably connected to the eccentric part of the crankshaft or eccentric shaft. In a slide drive device of a press machine to be moved, a clutch and a brake are provided on a drive shaft, and rotation and stop of a drive gear interposed between the clutch and the brake can be arbitrarily performed. A hydromechanical transmission (HMT) is interposed between a shaft end on the clutch side of the drive shaft and a flywheel that transmits power of a main motor as a power source via a pulley and a belt.

The hydromechanical transmission (HMT) comprises a set of a hydrostatic transmission (HST) and a planetary gear unit. The hydrostatic transmission (HST) comprises a variable pump having a first gear and a second gear. And a variable motor having: The first gear meshes with a third gear fixedly mounted on a main shaft on which a flywheel is rotatably provided, and the second gear has a sun gear coaxially with a fourth gear rotatably provided on the main shaft. . The planetary gear device comprises a planetary gear rotatably provided with a sun gear meshing with a carrier connected to a shaft end of a main shaft, and a ring gear around the planetary gear and meshing with the planetary gear.

[0009]

FIG. 1 shows an embodiment of the present invention.
As shown in FIG. 1, eccentric portions 2A and 2A of a crankshaft 2 rotatably supported by bearing members 3 and 3 of a frame (not shown) of a press machine 1 have rotatably connected connectors. Grods 5, 5 and a main gear 4 are provided. The drive gear 7 meshing with the main gear 4 includes a drive shaft 6
A clutch 8 and a brake 9 are provided on the drive shaft 6, and the rotation and stop of a drive gear 7 interposed between the clutch 8 and the brake 9 can be arbitrarily determined. Drive shaft 6
A hydromechanical transmission (HMT) 20 is interposed between the shaft end on the clutch 8 side and the flywheel 11 that transmits the power of the main motor 12 via a pulley 13 and a belt 14.

A hydromechanical transmission (HMT) 20 comprises a set of hydrostatic transmissions (HST) 21
And a planetary gear device 31. Hydrostatic transmission (H
ST) 21 includes a variable pump 22 having a first gear 24 and a variable motor 23 having a second gear 25. The first gear 24 is fixed to a main shaft 29 on which the flywheel 11 is rotatably provided. The third gear 26 and the second gear 25 have a sun gear 28 on the same axis, and mesh with a fourth gear 27 rotatably provided on a main shaft 29.

The planetary gear device 31 is provided with planetary gears 32 and 32 rotatably engaged with the sun gear 28, and a carrier 34 connected to the shaft end of the main shaft 29 and a planetary gear 32 around the planetary gears 32. It comprises gears 32, 32 and a ring gear 33 that meshes.

The power from the flywheel 11 is divided by a third gear 26, and the mechanical power directly input to the carrier 34 of the planetary gear unit 31 and the hydrostatic transmission (HST) 21
And the hydraulic power entering the sun gear 28 via
Output from the ring gear 33. Thus, the driving gear 7
Rotates, the main gear 4 and the crankshaft 2 that mesh with each other rotate, and the slide 1 moves through the connecting rods 5, 5.
0 moves up and down.

When the rotation of the variable motor 23 is set to zero,
The power transmission to the hydraulic power side is zero and the flywheel 11
Is transmitted to the machine side. At this time, the transmission efficiency is maximized. From this state, when the rotation of the variable motor 23 is rotated in the forward and reverse directions, the output rotation can be increased or decreased, and a continuously variable transmission is configured.

In this embodiment, the crankshaft has two points. However, the crankshaft may have one point or more points, or an eccentric shaft.

[0015]

As is clear from the above description, according to the present invention, it is possible to provide a slide drive device for a press machine which is compact and can arbitrarily set a slide motion under optimum processing conditions for a product to be pressed.

[Brief description of the drawings]

FIG. 1 is a simplified front view of a slide drive device for a press machine according to an embodiment of the present invention.

[Explanation of symbols]

1 is a press machine, 2 is a crankshaft, 2A is an eccentric part, 3
Is a bearing member, 4 is a main gear, 5 is a connecting rod, 6 is a drive shaft, 7 is a drive gear, 8 is a clutch, 9 is a brake, 10 is a slide, 11 is a flywheel, 12
Is a main motor, 13 is a pulley, 14 is a belt, 20
Is a hydromechanical transmission (HMT),
21 is a hydrostatic transmission (HST), 22 is a variable pump, 2
3 is a variable motor, 24 is a first gear, 25 is a second gear, 2
6 is a third gear, 27 is a fourth gear, 28 is a sun gear, 29
Is a main shaft, 31 is a planetary gear device, 32 is a planetary gear, 33 is a ring gear, and 34 is a carrier.

Claims (1)

[Claims] A crankshaft rotatably supported by a bearing member of a frame via a drive gear provided on a drive shaft and a main gear meshing with the drive gear, and having a main gear provided on the shaft; Alternatively, in a slide drive device of a press machine for transmitting a signal to an eccentric shaft and moving the slide up and down via a connecting shaft rotatably connected to a crankshaft or an eccentric portion of the eccentric shaft, Has a clutch and a brake, and can freely rotate and stop a drive gear interposed between the clutch and the brake. (B) A hydromechanical transmission (HMT) is interposed between a clutch-side shaft end of the drive shaft and a flywheel that transmits power of a main motor as a power source via a pulley and a belt. (C) Hydromechanical transmission (HM
T) comprises a set of hydrostatic transmissions (HST) and a planetary gear set. (D) The hydrostatic transmission (HST) includes a variable pump having a first gear and a variable motor having a second gear. (E) The first gear is a third gear fixedly mounted on a main shaft on which a flywheel is rotatably provided, and the second gear is a fourth gear provided with a sun gear coaxially and rotatably provided on the main shaft. Mesh each. (F) The planetary gear device comprises a planetary gear rotatably provided with a sun gear, and a carrier connected to the shaft end of the main shaft, and a ring gear around the planetary gear and meshing with the planetary gear. A slide drive device for a press machine, comprising: