JP2000052175A - Clamping device for crankshaft - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the fixing of a crankshaft and posture correction by a simple structure and to effectively use a space. SOLUTION: A clamping device is provided with a cylinder portion 16 for rotating a clamp arm 20 under linking operations performed by first linking members 44a and 44b connected to the clamp arm 20, and a tilting member 48 for tilting a crankshaft engaged with a work engaging portion 64 by a specified angle in a circumferential direction by being linked with the rotation of the cramp arm 20 under a linking operation performed by a second linking member 50 connected to the clamp arm 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crankshaft clamping device for fixing a transported crankshaft on a work station.

[0002]

2. Description of the Related Art A crankshaft constituting a main shaft of a vehicle engine has been known. In the manufacturing process of this type of crankshaft, as a means for fixing the crankshaft, for example, an arm connected to a piston rod is rotated under the action of driving a cylinder, and the crankshaft is rotated via the arm. A clamp device that holds the crankshaft by holding it is used.

By the way, when the crankshaft conveyed to the work station by the conveying means is fixed by the clamp device and various processes such as drilling and keyway processing are performed, the crankshaft is rotated at a predetermined angle in the circumferential direction. A posture correcting device that rotates and corrects the posture of the crankshaft is required.

That is, the swelling weight portion and the crankpin portion are integrally formed on the crankshaft, and the crankshaft is held in a predetermined posture by the gravity of the weight portion. Therefore, for example, when drilling is performed by a drill, it is necessary to rotate the crankshaft in the predetermined position in the circumferential direction by a predetermined angle and correct the position of the crankshaft so that the drilled portion faces the drill. There is.

[0005]

However, in the prior art, a clamp device for fixing the crankshaft and a posture correcting device for correcting the posture of the crankshaft are required, respectively. In addition to the complexity, there is a disadvantage that the space in the work station cannot be effectively used.

Further, since the crankshaft has the weight portion, there is a disadvantage that the posture of the crankshaft cannot be easily corrected.

SUMMARY OF THE INVENTION The present invention has been made to overcome the above-mentioned inconvenience, and it is possible to easily fix and correct the posture of a crankshaft with a simple structure and to effectively utilize space. An object of the present invention is to provide a clamp device for a crankshaft.

[0008]

In order to achieve the above object, the present invention provides a clamp device for fixing a crankshaft under the action of a clamp arm, comprising a support mechanism for supporting the crankshaft. Under the linking action of the first link member connected to the clamp arm,
Driving means for rotating the clamp arm and a linking action of a second link member having one end connected to the clamp arm are supported by the support mechanism in conjunction with the rotation of the clamp arm. A tilting mechanism for tilting the crankshaft in the circumferential direction.

In this case, the tilting mechanism is rotatably supported by the bearing block via a shaft and a bearing block fixed to the upper surface of the base, and is engaged with a pin of the crankshaft. A tilting member having a portion formed therein, wherein the tilting member rotates by a predetermined angle about the shaft portion in conjunction with the turning operation of the clamp arm under the linking action of the second link member, whereby The crankshaft engaging with the joint portion is tilted in the circumferential direction.

[0010] The tilting member is a flat plate having a shaft portion pivotally attached to a bearing block and a substantially semi-elliptical concave portion which is engaged with a pin portion formed between weight portions of a crankshaft. And one end of a second link member is connected via a pin member to a position deviated from a shaft serving as a rotation center.

According to the present invention, when the driving means is urged to rotate the clamp arm, the clamp arm and the clamp arm are linked by the first and second link members connected to the clamp arm. The tilting member and the tilting member cooperate substantially simultaneously, and the crankshaft is tilted in the circumferential direction by a predetermined angle from the initial position by the tilting member. As a result, the crankshaft is held by the clamp arm in such a tilted state.

As described above, according to the present invention, the fixing and the posture correction of the crankshaft can be performed substantially simultaneously and simply by a simple mechanism.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a crankshaft clamping device according to the present invention will be described below with reference to the accompanying drawings.

In FIG. 1 and FIG.
1 shows a production line in which the crankshaft clamping device 10 according to the embodiment of the present invention is incorporated.

The production line 11 includes a belt conveyor 1
3 has a transfer device 15 which grips a crankshaft 24 which is a shaft-shaped work conveyed by the apparatus 3 and supplies the work to each work station, wherein the transfer device 15 is a model discriminating station provided with a model discriminating device. The crankshaft 24 is transferred to 17.

The model determination station 17 measures the length of the crankshaft 24 and the like, and determines the type of the crankshaft 24 based on the measurement result. After that, the transfer device 15 supplies the crankshafts 24 side by side to the transfer table 21a provided in the work alignment station 19 two by two.

The transport mechanism 23a includes a crankshaft 24
From the transfer table 21a to the processing table 25 via the transfer table 21b. Crankshaft 24 conveyed to processing table 25
Is drilled by the first turret head processing device 27. The processed crankshaft 24 is transported by transport mechanisms 23b to transport tables 21c and 21d.
And is conveyed to the processing table 29 through which the second turret head processing device 31 processes key grooves and the like.

Thereafter, the crankshaft 24 is conveyed to a detecting device 33, which detects a machining state of a keyway or the like. And the crankshaft 24
Is transported by the transport mechanism 23b to the transport platform 21f via the transport platform 21e, and further transported to the next step.

As shown in FIG. 3, the crankshaft clamping device 10 according to the present embodiment includes a first turret head machining device 27 and a second
A processing table 25 adjacent to the turret head processing device 31;
29 respectively.

This crankshaft clamping device 10
Is connected to a base 12, a pedestal 14 fixed on the base 12, a cylinder (drive means) 16 fixed to the base 12, and driven by the cylinder 16. A clamp mechanism 22 having a clamp arm 20 which rotates by a predetermined angle around the pin 18;
(See FIG. 7) a tilting mechanism 26 for tilting the crankshaft 2 by a predetermined angle;
4 is supported in a substantially horizontal state.

The cylinder section 16 has a cylinder body 30 having a rectangular section and having a cylinder chamber (not shown) formed therein.
And a rod cover 32 for closing the cylinder chamber. A piston (not shown) that reciprocates along the cylinder chamber under the action of hydraulic pressure supplied through a hydraulic port (not shown) is accommodated in the cylinder chamber, and the piston is integrated with the piston. The piston rod 34 which is displaced in a horizontal direction is connected.

A clamp arm 20 is connected to one end of the piston rod 34 via a connecting pin 18, and the clamp arm 20 is provided to be rotatable by a predetermined angle around the connecting pin 18 as its center of rotation. ing.

The clamp mechanism 22 has a fixed block 36 fixed to the upper surface of the rod cover 32, one end rotatably supported by the fixed block 36 via a connecting pin 38, and the other end connected. A pair of first shafts rotatably supported at a substantially central portion of the clamp arm 20 via pins 40.
It has link members 44a and 44b. The set of first
The link members 44a and 44b are provided so as to be substantially parallel to each other with a predetermined space therebetween.

The pair of first link members 44a, 44b
One end is pivotally supported at the approximate center of the clamp arm 20 via the connection pin 40, and the other end is connected to the connection pin 4
The second link member 5 pivotally supported by the tilting member 48 via the
0 is provided. One end of each of the first link members 44a and 44b and the second link member 50 is
0 through the recess 42 formed on one side surface of the connecting pin 4.
0 is commonly supported.

The tilting mechanism 26 is, as shown in FIG.
A bearing block 52 fixed to the upper surface of the pedestal 14, and a tilting member 48 rotatably supported by the bearing block 52;
And a second link member 50 connected to the tilting member 48 via a connecting pin 46. The tilting member 48
Is the shaft portion 5 fitted in the through hole 54 of the bearing block 52.
6 and a flat plate portion 58 having a substantially U-shaped cross section. The flat plate portion 58 is formed of a substantially semi-elliptical concave portion, and the weight portions 60a, 60b of the crankshaft 24 are formed.
Work engaging portion 6 that engages with pin portion 62 having a circular cross section between them.
4 are formed. A screw member 68 for holding a plate 66 for retaining is screwed into the shaft portion 56.

The support mechanism 28 includes a first support block 72a having a recess 70a for supporting one end of the crankshaft 24, and a second support block having a recess 70b for supporting the other end of the crankshaft 24. Block 72b
And

The crankshaft clamping device 10 according to the present embodiment is basically constructed as described above. Next, the operation and effects of the device will be described.

The crankshaft 24 is transported onto a work station by a transport means (not shown), and the crankshaft 24 is transported by the first and second support blocks 72.
a and 72b are in a state of being supported at a substantially horizontal position. In this case, as shown in FIG.
0 is in an unclamped state, and the axis of the tilting member 48 is in a substantially vertical direction, and the work engaging portion is engaged with the pin portion 62 of the crankshaft 24 (see FIG. 8).

A hydraulic pressure is supplied into the cylinder chamber of the cylinder section 16 through one hydraulic port (not shown), and when a piston (not shown) rises under the action of the hydraulic pressure, the piston rod 34 rises integrally with the piston, Under the link action of the first link members 44a, 44b, the connecting pin 1
The clamp arm 20 is rotated by a predetermined angle in the direction of the arrow A about the center 8 as shown in FIG.

In this case, the tilting member 48 interlocks with the turning operation of the clamp arm 20 under the linking action of the second link member 50, and turns by a predetermined angle about the shaft 56 in the direction of arrow B to initially move. From the position, the state shown in FIG. 5 is reached. Therefore, as shown in FIG.
Pin portion 62 that engages with work engaging portion 64 of tilting member 48
Is tilted in the circumferential direction by a predetermined angle.

When the piston further rises and reaches the displacement end position, as shown in FIG. 6, the tilting member 48 tilts about 90 degrees from the initial position about the shaft 56, and the clamp arm 20 is connected. The crankshaft 24 is further rotated around the pin 18 in the direction of arrow A and
Abuts on the pin portion 62. As a result, the crankshaft 24 is clamped by the pin portion 62 held between the clamp arm 20 and the upper surface of the pedestal 14 in a state in which the crankshaft 24 is rotated about 90 degrees in the circumferential direction from the initial position, and FIG. As shown, the weight portions 60a, 60b are held in a state of protruding to a substantially horizontal position.

In the state where the crankshaft 24 is clamped in this way, the first turret head processing device 27 or the second turret head processing device 31, for example, drills holes in the weight portions 60a and 60b, Etc. are performed.

Next, a description will be given of a case where such a clamped state is released after various processing operations on the crankshaft 24 are completed.

By supplying hydraulic pressure to the cylinder chamber from the other hydraulic port (not shown), the piston descends,
When the piston rod 34 descends integrally with the piston, the clamp arm 20 rotates about the connecting pin 18 in the opposite direction (the direction opposite to the arrow A). Therefore, the clamp arm 20 is
By moving away from the position 4, the unclamping state is established, and it returns to the initial position.

In this case, under the linking action of the second link member 50, in conjunction with the turning operation of the clamp arm 20,
When the tilting member 48 rotates about the shaft 56 in the opposite direction (the direction opposite to the arrow B), the tilting member 48 returns to the initial position shown in FIG.

In the present embodiment, the crankshaft 24
The crankshaft 24 can be tilted at a predetermined angle in the circumferential direction via the tilting member 48 in conjunction with the rotation of the clamp arm 20 that clamps the crankshaft. Therefore, the fixation and the posture correction of the crankshaft 24 can be easily and substantially simultaneously performed by a simple mechanism, and the space in the work station can be effectively used.

Further, in this embodiment, by providing the tilting member 48 which is linked to the clamp arm 20 under the linking action of the second link member 50, the crankshaft 24 can be easily tilted at a predetermined angle. There is.

[0038]

According to the present invention, the following effects can be obtained.

That is, with a simple configuration, the fixing and the posture correction of the crankshaft can be performed simply and substantially simultaneously. Moreover, it is possible to effectively use the space in the work station where the crankshaft cylinder is disposed.

[Brief description of the drawings]

FIG. 1 is a plan view of a production line incorporating a crankshaft clamping device according to an embodiment of the present invention.

FIG. 2 is a front view of the production line shown in FIG.

FIG. 3 is a perspective view of a crankshaft clamping device according to an embodiment of the present invention.

4 is a partially omitted front view showing a state where the crankshaft clamping device shown in FIG. 3 is in an initial position.

5 is a partially omitted front view showing a state where the clamp arm and the tilting member shown in FIG. 4 are rotated by a predetermined angle from an initial position.

6 is a partially omitted front view when the clamp arm and the tilting member shown in FIG. 5 are further rotated by a predetermined angle to be in a clamped state.

FIG. 7 is a longitudinal sectional view taken along the line VII-VII shown in FIG.

8 is a perspective view showing an engagement relationship between a pin portion of a crankshaft and a tilting member at an initial position in FIG. 4;

FIG. 9 is a perspective view showing an engagement relationship between a pin portion of the crankshaft and a tilting member in the state of FIG. 5;

FIG. 10 is a perspective view showing an engagement relationship between a pin portion of a crankshaft and a tilting member in a clamped state of FIG. 6;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Clamping device for crankshafts 12 ... Base part 14 ... Base 16 ... Cylinder part 18, 38, 40, 46 ... Connection pin 20 ... Clamp arm 22 ... Clamp mechanism 24 ... Crankshaft 26 ... Tilt mechanism 28 ... Support mechanism 34 ... Piston rod 36 ... Fixing block 44a, 44b ... First link member 48 ... Tilt member 50 ... Second link member 52 ... Bearing block 56 ... Shaft portion 60a, 6
0b: weight portion 62: pin portion 64: work engaging portion 72a, 72b: support block

Claims (5)

[Claims] 1. A clamp device for fixing a crankshaft under the action of rotation of a clamp arm, wherein the support mechanism supports the crankshaft, and a link mechanism is provided by a first link member connected to the clamp arm. A driving means for rotating the clamp arm, and one end part of which is supported by the support mechanism in conjunction with the rotation of the clamp arm under a linking action of a second link member connected to the clamp arm. And a tilting mechanism for tilting the crankshaft in the circumferential direction. 2. The crankshaft clamping device according to claim 1, wherein the tilting mechanism comprises: a bearing block fixed to an upper surface of the pedestal;
Pivotally supported by the bearing block via a shaft portion,
A tilting member formed with an engaging portion that engages with a pin portion of the crankshaft, wherein the tilting member links the shaft portion in conjunction with the turning operation of the clamp arm under the linking action of the second link member. A crankshaft clamping device characterized in that a crankshaft engaged with an engaging portion is tilted in a circumferential direction by rotating a predetermined angle about the center. 3. The clamping device for a crankshaft according to claim 2, wherein one end of a second link member is connected to the tilting member via a pin member at a position deviated from a shaft serving as a rotation center. A clamping device for a crankshaft. 4. The crankshaft clamping device according to claim 2, wherein the tilting member is substantially half engaged with a shaft portion pivotally attached to the bearing block and a pin portion formed between the weight portions of the crankshaft. A crankshaft clamping device comprising: a flat plate portion having an elliptical concave portion. 5. The clamp device for a crankshaft according to claim 2, wherein the clamp arm and the tilting member interlock substantially simultaneously under the linking action of the first link member and the second link member. The crankshaft clamping device is characterized in that the crankshaft is held by the clamp arm in a state of being tilted in the circumferential direction by about 90 degrees from the initial position.