JPH0340483Y2 - - Google Patents

Description

[Detailed description of the invention] <Field of industrial application> The present invention relates to a chuck device for a crankshaft that is equipped with a pressing device that presses the flange portion of the crankshaft against a phasing member before clamping the crankshaft. be.

<Conventional technology> In order to machine the pin portion of a crankshaft using a lathe or grinder, a chuck device fixed to the spindle is used to align the center of rotation of the spindle with the center of the pin portion, and then rotate the crankshaft. It is necessary to grasp it.

For this reason, in the past, the journal part of the crankshaft was supported by the supporting member of the chuck device to position the crankshaft in the vertical direction, and the flange part of the crankshaft was used as a phasing member by a pressing rod that moved back and forth in the horizontal direction. The phase of the crankshaft was determined by pressing, and then the crankshaft was clamped.

<Problems to be solved by the invention> In the chuck device described above, the flange portion of the crankshaft is pressed in the horizontal direction by the pressing rod, so that the crankshaft does not move along the support surface of the support member. There was a risk that it would lift up and be clamped with the crankshaft out of position.

<Means for solving the problems> In order to solve the above-mentioned problems, the present invention includes a pressing device that presses the flange portion of the crankshaft toward the phasing member, and a pressing device that presses the flange portion of the crankshaft directly against the flange portion of the crankshaft. A pressing lever is provided which is rotatably supported by the chuck body on the opposite side of the crankshaft with respect to its rotational center relative to the position where it is pressed and abuts against the flange portion, and applies a downward force to the crankshaft.

<Examples> Examples of the present invention will be described below based on the drawings. In FIGS. 1, 2, and 3, 10 is a spindle, and this spindle 10 is rotatably supported on a headstock (not shown). A chuck device 11 is attached to the front of the spindle 10,
A journal portion J of the crankshaft W is gripped by this chuck device 11.

Reference numeral 20 denotes a chuck body of the chuck device 11, and a movable body 21 is supported on the chuck body 20 so as to be movable back and forth in the direction of the rotational axis of the spindle 10. One end of the movable body 21 is operatively connected to a cylinder device 22 provided at the rear of the spindle 10. Further, an axial positioning member 23 is supported on the chuck main body 20 so as to be able to advance and retreat in the same direction as the movable body 21, and one end of this axial positioning member 23 is formed with a contact portion 23a that contacts the end of the crankshaft W. , an engaging portion 23b that engages with the movable body 21 only when the movable body 21 retreats by a predetermined amount is formed at the other end. A spring 25 that presses the axial positioning member 23 toward the crankshaft W is inserted between the chuck body 10 and the axial positioning member 23, and the movement of the axial positioning member 23 is caused by the groove formed in the axial positioning member 22. A fixing pin 27 fixed to the chuck main body 20 is engaged with the chuck 23c, so that the chuck is restrained.

A support member cylinder device 30 for vertically moving a support member, which will be described later, is provided at the front of the chuck body 20, and this cylinder device 30 is provided with a piston 31 that moves horizontally. A connecting pin 32 is fixed to the center of the piston 31, and this connecting pin 32 is connected to a movable stopper 33. The movable stopper 33 is horizontally slidably guided by the chuck body 20, and has a first abutting part 33a and a second abutting part 33b, which abut the lower surface of the support member 35 and have different heights. It is formed. Further, an engagement pin 34 is fixed to the upper part of the movable stopper 33, and this engagement pin 34 is engaged with a support member 35. This support member 35 is adapted to be slidably guided in the vertical direction by the chuck body 20, and an arc-shaped support surface 36 that supports the journal portion J of the crankshaft W is formed on the upper part of the support member 35. has been done. Support member 35
A cam groove 3 that engages with the engagement pin 34 is provided at the lower part of the cam groove 3.
7 is formed, and below the cam groove 37, a contact portion 3 protruding downward that contacts the first contact portion 33a or the second contact portion 33b of the movable stopper 33 is formed.
8 is formed, and an inclined surface 39 is formed continuously to this contact portion 38. The movable stopper 33 has an inclined surface 33c having the same inclination angle as the inclined surface 39 of the support member 35 between the first abutting part 33a and the second abutting part 33b.

45 is a clamp device that presses the crankshaft W against the support member 35 side, and this clamp device 45
is equipped with a pair of clamp rods 46 that move toward or away from the crankshaft W at the same time.
The clamp rod 46 is supported by the chuck body 20 so as to be horizontally movable.One end of an operating shaft 47 is engaged with the clamp rod 46, as shown in FIG. 4. This engagement is achieved by engaging an inclined protrusion 47a formed on the operating shaft 47 with an inclined groove 46a formed on the clamp rod 46. One end of the operating shaft 47 is connected to the movable body 21
operably connected to.

Reference numeral 50 denotes a phasing member fixed to the chuck main body 20 that comes into contact with the flange portion F of the crankshaft W. By bringing the flange portion F of the crankshaft W into contact with this phasing member 50, rotation around the axis of the crankshaft W is achieved. The phase is now determined. A plurality of air holes 51 are formed in the phasing member 50 and are closed by the flange portion F of the crankshaft W. By closing these air holes 51, it is possible to determine whether or not the crankshaft W is present and whether the crankshaft is of another type. It is possible to check whether the shaft W is attached.

Reference numeral 52 denotes a pressing device for pressing the flange portion F of the crankshaft W against the phase determining member 50, and this pressing device 52 is equipped with a pressing rod 53 supported by the chuck body 20 so as to be movable in the horizontal direction.
As shown in FIG. 5, one end of an operating shaft 54 is engaged with the press rod 53, and this engagement
This is achieved by engaging an inclined protrusion 54a formed on the operating shaft 54 with an inclined groove 53a formed on the actuating shaft 54. The operating shaft 54 is a pressing rod 53
A long groove 55 is formed in one end of this operating shaft 54, and an engagement formed in the movable body 21 is formed in the long groove 55 only when the movable body 21 is retreated by a predetermined amount. The portion 21a is adapted to engage. A pressing spring 56 is interposed between the chuck body 20 and the operating shaft 54.

Reference numeral 60 denotes a pressing lever that is pressed against the flange portion F by the pressing rod 53, and this pressing lever 60 is rotatably attached to the chuck body 20 on the side opposite to the axis of the crankshaft W with respect to the point where it contacts the flange portion F. It is mounted on a shaft. A contact portion 61 that contacts the pressing rod 53 and contact portions 62 and 63 that contact the flange portion F are formed at one end of the pressing lever 60.
Further, an engaging portion 64 that protrudes laterally is formed. This engaging portion 64 is inserted into the engaging groove 53b formed at one end of the pressing rod 53 when the pressing rod 53 is retracted.
By engaging the pressing lever 60, the pressing lever 60 is turned counterclockwise.

Next, the operation will be explained based on the above-described configuration. With the clamp rod 46 and the axial positioning member 22 retracted, the journal portion J of the crankshaft W is supported by the support member 35. The crankshaft W is supported in an inclined state in which the flange portion F does not come into contact with the phase determining member 50. When the cylinder device 22 is actuated, the movable body 21 moves forward, and the axial positioning member 22, which has been kept in tension, begins to move forward due to the force of the spring 25. Movable body 2
1 is further advanced, the operating shaft 54, which has been stretched until now, is advanced by the pressing spring 56,
This advancement of the operating shaft 54 causes the pressing rod 53 to advance due to a wedge action. When the pressing rod 53 moves forward, the pressing lever 60 rotates clockwise, and the pressing lever 60 is directly pressed against the flange portion F.
When the flange portion F is pressed, the crankshaft W rotates counterclockwise around the axis of the crankshaft W.
The flange portion F contacts the phase determining member 50. This determines the phase of the crankshaft W.
At this time, a rotational force about the axis of the crankshaft W acts on the crankshaft W at the point where the pressing lever 60 and the flange portion F come into contact. Since a force that presses the crankshaft downward acts as a component of this rotational force, the crankshaft W is not lifted along the support surface 36 of the support member 35. When the movable body 21 is further advanced, the operating shaft 47 is advanced, and the clamp rod 46 is advanced in the direction of the crankshaft W by a wedge action. As a result, the crankshaft W is pressed against the support member 35 and clamped. With the crankshaft W being clamped, the spindle 10 is rotated together with the chuck body 20, and the pin portion P of the crankshaft W is ground or turned. When this machining is completed and the chuck body 20 is stopped at a predetermined angular position, the cylinder device 22 is activated and the movable body 21 is moved backward. As the movable body 21 moves back, the clamp rod 46 moves back and the clamp is released, the pressing rod 53 moves back and the phasing of the crankshaft W is released, and the axial positioning member 22 moves back and the crankshaft W is released. Axial positioning is released.

Next, when installing a crankshaft W having a different pin stroke, pressure oil is supplied to the supporting member cylinder device 30 to move the piston 3 to the left. As the piston 31 moves to the left, the movable stopper 33 moves to the left.
By engaging the inclined surface 31 with the inclined surface 33c, the supporting member 35 is raised, the abutting portion 38 abuts the second abutting portion 33b, and the supporting member 35 is positioned upward. Conversely, in order to clamp a crankshaft W with a long pin stroke, the piston 31 is moved to the right, the engagement pin 34 moves the support member 35 downward, and the contact portion 38 is moved to the first contact portion 33a. The support member 35 is positioned downwardly by being brought into contact with the support member 35.

<Effects of the invention> As described above, the present invention includes a pressing device that presses the flange of the crankshaft toward the phasing member, and a device that is directly pressed against the flange of the crankshaft and comes into contact with the flange. A pressing lever is provided that is rotatably supported by the chuck body on the opposite side of the rotation center of the crankshaft with respect to the point of contact, and this pressing lever is used to generate a rotational force that includes a force that presses the crankshaft downward against the crankshaft. Since the force is applied, there is an advantage that the crankshaft will not be lifted along the support surface and the crankshaft will not be clamped at a misaligned position.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a sectional view showing the main parts of the chuck device, Fig. 2 is a longitudinal sectional view in the direction of the axis of rotation of the spindle, and Fig.
Partially sectional view seen from the direction shown in the figure, No. 4
The figure is a cross-sectional view taken along the - line in Figure 3, and Figure 5.
The figure is a cross-sectional view taken along the - line in FIG. 3. 10... spindle, 11... chuck device,
20...chuck body, 21...movable body, 22...
...Cylinder device, 35... Support member, 45... Clamp device, 46... Clamp rod, 47...
Operating shaft, 50... Phase determining member, 52... Pressing device, 53... Pressing rod, 54... Operating shaft, 56
...Press spring, 60...Press lever, 6
1, 62, 63...Abutting portion, 64...Engaging portion.

Claims (1)

[Scope of utility model registration request] The chuck body includes a support member that supports the journal portion of the crankshaft, a clamp device that presses and clamps the crankshaft against this support member, and a clamp device that contacts the flange portion of the crankshaft to determine the phase around the axis of the crankshaft. In a crankshaft chuck device comprising a phasing member and a pressing device that presses a flange portion of the crankshaft toward the phasing member, the flange portion is directly pressed against the flange portion of the crankshaft by the pressing device. A chuck device for a crankshaft, characterized in that a pressing lever is provided on a side opposite to the rotation center of the crankshaft with respect to a position where it comes into contact with the chuck body, and is rotatably supported by the chuck body and applies a downward force to the crankshaft.