JPH04344892A - Device for transmitting motive power of press - Google Patents

Abstract

PURPOSE:To transform a constant rotary motion to an inconstant rotary motion without using gears. CONSTITUTION:The device is characterized by such construction that a first transmission means 44, which is rotated by receiving the rotation of a flywheel 14, and a second transmission means 46, which is rotated by the rotation of the first transmission means, are on a common rotary axis line; that a third transmission means 50, which is pivotally connected to the second transmission means, is rotated by the rotation of the second transmission means; and that a fourth transmission means 54, which is pivotally connected to the third transmission means and rotates a crank shaft, is rotated by the rotation of the third transmission means.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power transmission device for a press machine that transmits the rotational motion of a flywheel to a crankshaft.

0002

2. Description of the Related Art Generally, a power transmission device for a press machine, which converts uniform rotational motion of a flywheel into nonuniform rotational motion and transmits the same to a crankshaft, receives the rotation of the flywheel and transmits the rotational motion of the flywheel. It includes a pinion gear rotated around an axis, a main gear meshed with the pinion gear, and a pair of links that transmit the rotation of the main gear to the crankshaft (for example, Japanese Patent Laid-Open No. 124498/1983) reference). One link is pivotally connected at one end to an eccentric portion of the main gear, and the other link is pivotally connected to the other end of the one link and fixed to the crankshaft. There is.

However, in the conventional power transmission device described above, since the rotational axes of the two gears are separated from each other, an unbalanced force acts between the two gears, resulting in vibration. In addition, the power transmission device becomes large and complicated by an amount corresponding to the distance between the rotational axes of both gears.

0004

SUMMARY OF THE INVENTION An object of the present invention is to convert uniform rotational motion into inconstant rotational motion without using gears.

[0005]

[Solution, operation, and effect] The power transmission device for a press machine of the present invention provides a first
transmission means, and the first transmission means receives rotation of the first transmission means.
a second transmission means rotated about a rotational axis of the transmission means; and a third transmission means pivotally connected to the second transmission means to be rotated by the rotation of the second transmission means. and a fourth transmission means pivotally connected to the third transmission means to be rotated by rotation of the third transmission means and connected to the crankshaft to rotate the crankshaft. .

[0006] The uniform rotational motion of the flywheel consists of the first to
The information is sequentially transmitted to the fourth transmission means. The first and second transmission means perform uniform rotational motion in accordance with the uniform rotational motion of the flywheel. However, if the rotational axis of the fourth transmission means is eccentric with respect to the rotational axis of the first transmission means, the fourth transmission means rotates at an inconstant speed in accordance with the uniform rotational movement of the flywheel. The non-uniform rotational motion is ultimately transmitted to the crankshaft. When a uniform rotational motion is converted into an inconstant rotational motion, adjacent transmission means undergo relative angular rotation due to their pivotal connection. This results in
With respect to the angular velocity of the first transmission means that performs uniform rotational motion,
The difference in angular velocity of the fourth transmission means that performs non-uniform rotational motion is absorbed. The rotational speed of the fourth transmission means with respect to the first transmission means, that is, the reciprocating speed of the slide, is determined by the distance between the rotational axes of the first and fourth transmission means, the relative relationship between the rotational axes of the first and fourth transmission means. It varies depending on the direction of target displacement, the distance between the pivot connecting parts of adjacent transmission means, etc.

According to the present invention, since the first and second transmission means have a common rotational axis, uniform rotational motion can be converted to nonuniform rotational motion without using gears as the first and second transmission means. motion, and no unbalanced forces act between the first and second transmission means.

[0008] A rotary shaft that is rotated about the rotary axis in response to the rotation of the flywheel is used as the first transmission means, and the second transmitter is configured to rotate around the rotary axis in response to the rotation of the rotary shaft. Preferably, it is attached to a shaft. This makes the device smaller and simpler than known devices using a pair of gears and a pair of links.

By aligning the axis of rotation of the first transmission means with the axis of rotation of the flywheel, the apparatus becomes more compact and simpler than known apparatuses using a pair of gears and a pair of links. Become.

The third transmission means is rotated around the rotation axis of the second transmission means and the rotation axis of the crankshaft, and the fourth transmission means is rotated around the rotation axis of the crankshaft. Each axis can be selected for rotation.

[0011] The fourth transmission means may be attached to the crankshaft so that its axis of rotation coincides with the axis of rotation of the crankshaft. Said first and fourth
The axes of rotation of the transmission means may essentially coincide, but
In order to reliably convert uniform rotational motion into nonuniform rotational motion, it is preferable that the rotational axes of the first and fourth transmission means extend parallel to each other and are spaced apart from each other.

0012

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, a press machine 10 has a power transmission device 12 of the present invention disposed between a flywheel 14 and a crankshaft 16.

As shown in FIG. 2, the flywheel 14 is rotatably supported by a plurality of bearings 22 in a housing 20 attached to the frame 18 of the press 10 by a plurality of bolts around an axis extending in the horizontal direction. ing. On the other hand, the crankshaft 16 is rotatably mounted on the frame 1 by a plurality of bearings 24 around an axis extending in the horizontal direction.
It is supported by 8. The rotation axis of the flywheel 14 and the rotation axis of the crankshaft 16 are parallel to each other, although they are displaced from each other.

Motor 26 attached to frame 18
The rotation is caused by the pulley 2 attached to the rotating shaft of the motor.
8 and a belt 30 wound around the pulley and the flywheel 14, the transmission is transmitted to the flywheel 14, and further from the flywheel 14 to a known clutch/brake mechanism 3 disposed in relation to the flywheel.
2 and the power transmission device 12 to the crankshaft 16.

The crankshaft 16 has two eccentric parts, and a common slide 36 is supported on the eccentric parts via a connector 34. The slide 36 is reciprocated in the vertical direction with respect to a bolster 38 attached to the frame 18 as the crankshaft 16 rotates. Displacement of the slide 36 in the horizontal direction is regulated by a pair of guide rods 40 attached to the frame 18 in parallel to each other.

As shown in FIGS. 2 and 3, the power transmission device 12 includes a rotating shaft 44 rotatably supported in the housing 20 by a plurality of bearings 42 so as to have a common rotational axis with the flywheel 14, and a rotating shaft 44 having one end. The rotating shaft 44
a link 50 pivotally connected at one end to the other end of the arm 46 by a pin 48; and a link 50 pivotally connected at one end to the other end of the link 50 by a pin 52. and a lever 54 connected to the crankshaft 16 and attached to the crankshaft 16 at the other end.

Rotating shaft 44, arm 46, and crankshaft 16
and lever 54 are each maintained relatively unrotatable by a key or the like. The rotating shaft 44 supports the clutch/brake mechanism 32 in a relatively unrotatable manner so as to receive the rotation of the flywheel 14 via the clutch/brake mechanism 32.

When the rotation of the flywheel 14 is transmitted to the rotating shaft 44 via the clutch/brake mechanism 32, the arm 46 is rotated together with the rotating shaft 44, the link 50 is rotated by the arm 46, and the lever 54 is rotated by the link 50. The crankshaft 16 is rotated by the lever 54.

As the rotating shaft 44 rotates, the arm 4
6 is rotated around the rotational axis of the rotational shaft 44, whereas the lever 54 is rotated around the rotational axis of the crankshaft 16. The arm 46 rotates at a constant speed around the axis of rotation of the rotating shaft 44, while the lever 54 rotates at an inconstant speed around the axis of rotation of the crankshaft 16. Therefore, the crankshaft 16 rotates at an inconstant speed around the rotational axis P2 in conjunction with the constant rotational movement of the flywheel 14.

Lever 54 relative to the rotation angle of rotation shaft 44
The rotational speed of the slide 36, that is, the reciprocating speed of the slide 36 is
In FIG. 3, the distance between the rotational axis P1 of the rotational shaft 44 and the rotational axis P2 of the crankshaft 16 (displacement amount of both rotational axes), the angle θ of the line connecting the rotational axes P1 and P2 with respect to the horizontal axis (the displacement of both rotational axes) direction of displacement), the distance between the axis of rotation P1 and the axis P3 of the pin 48, the distance between the axis of rotation P2 and the axis P4 of the pin 52, the distance between the axes P3 and P4, etc.

Rotation axis P of the rotation shaft 44 and lever 54
1 and P2 may be essentially the same. Rotating shaft 44
The vertical position of the slide 36 with respect to the rotation angle of
An example of reciprocating velocity and acceleration is shown in FIG. 4 by curves A, B, and C, respectively.

As is clear from FIG. 4, in the above embodiment, the bottom dead center of the slide 36 is reached when the rotating shaft 44 has rotated approximately 190 degrees, and the slide 36 gradually descends and rapidly rises. That is, the uniform rotational motion of the flywheel 14 is converted by the power transmission device 12 into an inconstant rotational motion in which the slide 36 is gradually lowered and then rapidly raised.

According to the power transmission device 12, the flywheel 14, the rotating shaft 44, and the arm 46 have a common rotational axis. The unbalanced force acting on the device is small, and the device becomes smaller and simpler. Furthermore, since the lever 54 is attached to the crankshaft 16, it can be easily assembled into an existing press machine.

Arm 46, link 50 and lever 54
If the unbalanced force accompanying the rotation of the crankshaft is a problem, counterweights may be attached to the rotating shaft 46 and the crankshaft 16, or discs may be used in place of the arm 46 and the lever 54. Further, instead of directly attaching the lever 54 to the crankshaft 16, an output shaft to which the lever 54 is attached may be provided and the output shaft may be connected to the crankshaft.
may be rotated around a rotation axis different from the rotation axis of the crankshaft 16.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of a press machine equipped with a power transmission device of the present invention.

FIG. 2 is a sectional view showing an embodiment of the power transmission device of the present invention.

FIG. 3 is an enlarged cross-sectional view taken along line 3-3 of FIG. 2;

FIG. 4 is a diagram showing the relationship between the vertical position, reciprocating speed, and acceleration of the slide with respect to the rotation angle of the rotating shaft.

[Explanation of symbols]

10 Press machine 12 Power transmission device 14 Flywheel 16 Crankshaft 18 Frame 26 Motor 32 Clutch and brake mechanism 36 Slide 44 Rotating shaft (first transmission means) 46 Arm (second transmission means) 50 Link (third means of communication) 54 Lever (fourth transmission means) 48, 52 Pivot connection pin P1 Rotation axis of rotation axis

Claims (6)

[Claims] 1. A power transmission device for a press machine that transmits the rotation of a flywheel to a crankshaft, the first transmission means being rotated in response to the rotation of the flywheel; and the first transmission means. a second transmission means rotated around the rotational axis of the first transmission means in response to rotation of the second transmission means;
a third transmission means pivotally connected to the second transmission means to be rotated by the rotation of the transmission means; and a third transmission means to be rotated by the rotation of the third transmission means. a fourth transmission means pivotally coupled and coupled to the crankshaft for rotating the crankshaft. 2. The first transmission means includes a rotation shaft that is rotated around the rotation axis in response to rotation of the flywheel, and the second transmission means includes a rotation shaft that rotates around the rotation axis in response to rotation of the flywheel. Claim 1, wherein the device is attached to a rotating shaft.
The power transmission device described in . 3. The power transmission device according to claim 1, wherein the rotational axis of the first transmission means coincides with the rotational axis of the flywheel. 4. The power transmission device according to claim 1, wherein the third transmission means is rotated around the rotation axis of the second transmission means and around the rotation axis of the crankshaft. . 5. The power source according to claim 1, wherein the fourth transmission means is attached to the crankshaft so that its rotational axis coincides with the rotational axis of the crankshaft. transmission device. 6. The power source according to claim 1, wherein the fourth transmission means is rotated about an axis eccentric to the rotation axis of the first transmission means. transmission device.