JPH0557486A - Transmission mechanism of crank press - Google Patents

Abstract

PURPOSE:To obtain a transmission mechanism for easy working by improving the wear of a connecting part which becomes a contacting point of a swinging motion and a straight motion at the drive transmission time of a crank press. CONSTITUTION:The 1st connecting rod 23 which connects a intermediate shaft 21 set parallel to an axial center of a crank shaft 1 is connected to the 2nd connecting rod 24 extending straight to the direction crossing orthogonally to the crank shaft through the intermediate shaft 21, the rotation of the crank shaft 1 is transformed to the straight motion and transmitted to the bearing unit 35 which is freely rotary and straight movable by holding the 2nd connecting rod 24. In spite of the swinging position with the eccentric center of the crank shaft, the force action can be received uniformly over all range of the circumference of the intermediate shaft, and the working is easy because it is the shaft system.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crank press transmission mechanism that converts the rotation of a crankshaft into a linear motion to transmit work.

[0002]

2. Description of the Related Art FIGS. 3 and 4 are a sectional view and a side view showing a transmission mechanism of a conventional crank press, wherein 1 is a crankshaft having an eccentric amount L, a stepped collar 1a is provided, and 2 is a groove 2a. Bearing metal 3 and 4 which are fitted to the outer circumference of the crankshaft 1 and are detachably mounted by splitting into two, and whose axial movement is restricted by the stepped collar 1a of the crankshaft 1 are the bearing metal 2 A holder A, a holder B, which is fitted to the outer periphery of the bearing metal 2 and holds the crankshaft 1 rotatably and slidably with the bearing metal 2 interposed therebetween, and whose axial movement is restricted by the groove 2a of the bearing metal 2; 5 is a connecting rod having a spherical surface portion 5a at one end and a threaded portion 5b at the other end, 6 is a mounting plate screwed to the other end screw portion 5b of the connecting rod 5, and 7 is the holder B4 and the mounting plate. Intermediate plate sandwiched between 6, 8 is above Next-coating rod 5 the mounting plate 6
After the screwing, the nut for holding and fixing, 9 is a lower metal that fits in the entire lower diameter part of the spherical surface portion 5a of the connecting rod 5 so as to be rotatable and slidable, and 10 is divided into two parts, and the spherical surface of the connecting rod 5 is divided. An upper metal that fits with a part of the upper part of the diameter of the portion 5a in a rotatable and slidable manner and holds together with the lower metal 9, and a holder 11 that detachably fits and stores the lower metal 9 and the upper metal 10. , 12 are the above lower metal 9
And a pressing plate for holding the upper metal 10 in the axial direction, and 13 is slidably fitted to the outer peripheral portion of the holder 11.
A holding plate for holding, 14 is a bolt A for fixing the pressing plate 12 to the holder 11, and 15 is the holding tool A3 and the holding tool B4.
Are bolts B and 16 for fixing the mounting plate 6 and the intermediate plate 7 to the holder B4.

Next, the operation will be described. When the crankshaft 1 having the eccentric amount L rotates from the top dead center to the bottom dead center, the crankshaft 1 and the bearing metal 2 rotate and slide, and the holder A3 and the holder B4 connected to each desired state. The connecting rod 5, the mounting plate 6, and the intermediate plate 7 swing and descend in the direction of arrow P. A holder 11 that swings and slides between the lower metal 9 and the upper metal 10 that are connected while sandwiching the spherical portion 5a of the connecting rod 5 at the same time as descending to hold the movement.
The holder 11 slides down while being held by the holding plate 13 to transfer a linear motion of 2 L downward, and generally performs work during this downward movement. Next, when the crankshaft 1 rotates from the bottom dead center to the top dead center, the crankshaft 1 swings in the direction opposite to the descending direction, rises in the Q direction, and stops at the top dead center. Here, when the connecting rod 5 is disassembled for repair or the like, the bolt 16 is removed and the intermediate plate 7 is pulled out, so that the connecting rod 5 can be disassembled while the crank portion is assembled.

[0004]

Since the conventional crank press transmission mechanism is constructed as described above, when the work is performed before the bottom dead center, the action of the force exerts an eccentric load on the spherical portion. In addition, since the entire spherical part is not retained,
Since the maximum area of the spherical surface cannot be received, surface pressure rises, wear is accelerated, and it is difficult to machine the spherical surface that serves as the contact point.
There is a problem that it takes a lot of processing time.

The present invention has been made in order to solve the above-mentioned problems, and an object thereof is to obtain a transmission mechanism in which abrasion is suppressed as much as possible during drive transmission and machining is easy.

[0006]

In a transmission mechanism of a crank press according to the present invention, a first connecting rod that connects an intermediate shaft and a crank shaft provided in parallel with a crank shaft center is orthogonal to the crank shaft. The second connecting rod extending straight in the direction is connected via the intermediate shaft, and the movement in the vertical direction is transmitted to the bearing unit that holds the second connecting rod.

[0007]

Since the transmission mechanism of the present invention uses the intermediate shaft which serves as a contact point for transmitting the work from the crankshaft, the force is always received on the uniform surface.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIGS. 1 and 2, the same reference numerals as those of the conventional one indicate the same or corresponding portions, 21 is an intermediate shaft positioned parallel to the axis of the crankshaft 1, 22 is a bush for rotatably holding the intermediate shaft 21, 23 Is a first connecting rod whose one end fits and holds the bush 22, and the other end holds the crankshaft 1 with a holder A3 and a bolt B15 sandwiching one of the bearing metals 2, and 24 is the intermediate shaft 21. A second connecting rod that fits with and holds detachably
Reference numeral 25 denotes a bearing A that receives a desired axial load, and 26 denotes the second connecting rod 24 with the bearing A25 sandwiched therebetween.
And a holding shaft fixed by a bolt 27, and a pair of bearings B and 28, which are fitted to the outer circumference of the shaft portion of the second connecting rod 24 and the outer circumference of the holding shaft 26 to hold the radial direction. Is the above bearing A25 and bearing B28
Bearing case for removably positioning and holding the shaft in the axial direction, 3
0 is a holding plate A that holds the axial direction of the one bearing B28.
Then, it is fixed to the bearing case 29 with the bolt 31. 32
Is a holding plate B for holding the one bearing B28 in the axial direction.
Then, it is fixed to the bearing case 29 with the bolt 33. 34
Is a spacer provided between the bearing A25 and the bearing B28, and adjusts the axial clearance. 35 is a bearing unit composed of the bearing A25 to the spacer 34, and 3
Reference numeral 6 is a plate having a guide hole 36a that fits in the bearing case 29 in a rotatable and slidable manner, and 37 is a bolt for connecting and fixing the bearing unit 35 to the lower unit.

Next, the operation will be described. When the crankshaft 1 having the amount of eccentricity L starts to rotate from the top dead center to the bottom dead center, the crankshaft 1 and the bearing metal 2 rotate and slide, and the respective holders A3 and the first connecting rods connected to each other. Two
The third connecting rod 2 starts to descend while swinging about the axis of the intermediate shaft 21, and further extends straight from the bearing unit 35 in the direction orthogonal to the crankshaft 1.
4 through the intermediate shaft 21 and then to the bearing unit 35 and guided by the guide hole 36a of the plate 36, and when the crankshaft 1 reaches the bottom dead center, it is moved in the arrow P direction 2
It linearly moves for L minutes and is transmitted to a lower unit (not shown). Generally, during this descending work, the transmission mechanism receives the reaction force. Next, when the crankshaft 1 rotates from the bottom dead center to the top dead center, the first shaft is moved in the direction opposite to the downward direction.
The connecting rod 23 rises in the Q direction while swinging, stops at the top dead center, and the series of operations is completed. Second
The connecting rod 24 does not undergo any oscillating motion due to the rotation of the crankshaft 1, and makes a linear reciprocating motion while being extended straight from the bearing unit 35. Further, when receiving rotation from a lower unit (not shown) for the purpose of, for example, driving a die height, the bearing case 29 of the bearing unit 35 rotates, and the bearing B28 receives the rotation of the bearing case 29 so that the second connecting rod rotates. It does not transmit to 24.

[0010]

As described above, according to the present invention, the eccentric motion of the crankshaft and the contact point which receives the eccentric motion and linearly moves are provided with the intermediate shaft which is parallel to the crankshaft. The work force can be uniformly applied to the entire circumference of the intermediate shaft regardless of the swing position due to the eccentricity. Further, since it is a shaft type, it is possible to obtain a product that is easily processed and has high accuracy. Furthermore, in the bearing unit, the clearance in the axial direction can be adjusted, and a highly accurate bearing unit in which no clearance is generated in the axial direction can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional front view showing a transmission mechanism of a crank press according to an embodiment of the present invention.

FIG. 2 is a side view showing an embodiment of the present invention.

FIG. 3 is a sectional view showing a transmission mechanism of a conventional crank press.

FIG. 4 is a side view showing a transmission mechanism of a conventional crank press.

[Explanation of symbols]

 1 crankshaft 2 bearing metal 3 retainer A 4 retainer B 5 connecting rod 15 bolt B 21 intermediate shaft 22 bush 23 1st connecting rod 24 2nd connecting rod 25 bearing A 26 retaining shaft 27 bolt 28 bearing B 29 bearing Case 30 Holding plate A 31 Bolt 32 Holding plate B 33 Bolt 34 Spacer 35 Bearing unit 36 Plate 36a Guide hole 37 Bolt

Claims (2)

[Claims] 1. In a crank press for converting a rotation of a crank shaft into a linear motion to obtain a predetermined press load, an intermediate shaft provided parallel to a crank shaft center, and connecting the intermediate shaft and the crank shaft to swing. A first connecting rod that linearly moves, a second connecting rod that linearly extends in a direction orthogonal to the crankshaft, is connected to the first connecting rod through the intermediate shaft, and that linearly moves, Crank press transmission mechanism consisting of a bearing unit that holds the connecting rod. 2. The bearing unit holds a bearing A that receives an axial load, a holding shaft that holds the second connecting rod in the axial direction with the bearing A sandwiched therebetween, and a radial direction of the second connecting rod. A pair of rotatable bearings B, the bearing A, a bearing case for detachably positioning and holding the pair of bearings B in the axial direction, a holding plate A and a holding plate B for holding the pair of bearings B in the axial direction, and a shaft. The transmission mechanism of a crank press according to claim 1, further comprising a spacer for adjusting a directional clearance.