JPH0128965Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a chuck device for a crankshaft in a processing device.

(Prior art) In processing equipment, the chuck device that holds the crankshaft at the end is installed in the chuck body provided at the tip of the main shaft. Disclosed are a face plate provided with an engaging protrusion on the front surface facing into the mating recess, and a bearing stand and a clamp arm that clamp the outer periphery of the end of a crankshaft that is engaged with the face plate.

(Problem to be solved by the invention) However, in such a chuck device, not only the face plate but also the bearing stand must be replaced depending on the type of crankshaft. It was complicated due to the nature of the supply, and the replacement work was also troublesome.

Therefore, the purpose of this invention is to make it possible to correspond to the type of crankshaft by simply replacing the face plate, without requiring any other replacement, and to automatically align the center of the face plate, making the replacement work easier. To provide a check device with

(Means for Solving the Problem) The chuck device, which is provided on the chuck body 2 provided at the tip of the main shaft 1 and holds the crankshaft W at the end B, is connected to an engaging recess formed in the end face of the crankshaft W. Hc, Hp, engaging protrusion 32 facing into Hp,
33 and 34 on the front, and a shaft 35 in the center of the rear.
and a face plate 31 provided with one tooth 17 of a carbyk coupling 15 around the rear surface.
and a clamping means 6 provided within the chuck body 2 to removably clamp the face plate 31 with the shaft portion 35.
Then, the other tooth 16 of the carbyk coupling 15 provided on the chuck body 2 engages with one tooth 17 of the carbyk coupling 15 provided on the face plate 31 clamped by the clamping means 6, and End B of the combined crankshaft W
The clamp piston 22 is arranged radially on the chuck body 2 to clamp the outer periphery, and is movable toward the center of the face plate 31.

(Function) Face plate 31 corresponding to the type of crankshaft W
When the shaft portion 35 of the chuck is inserted into the chuck body 2 and clamped by the clamping means 6, the centering of the face plate 31 is automatically performed by the carboxylic coupling 15 at the same time.

And the crankshaft W engaged with the face plate 31
Clamp pistons 22 arranged radially toward the outer periphery of the shaft end B move forward to clamp the outer periphery of the shaft end B.

(Example) Examples will be described below based on the accompanying drawings.

Figure 1 is a longitudinal sectional view of the main body of the chuck, and Figure 2 is a sectional view taken along the - line.
A chuck body 2 is provided at the tip of the chuck body 2, a through hole 3 is formed in a portion eccentric to the main shaft 1 of the chuck body 2, and a clamping means 6 is housed in the through hole 3.

The clamping means 6 consists of a clamp bar 7 and a draw bar 14, and in the figure, the upper half from the center of the through hole 3 is shown in an unclamped state, and the lower half is shown in a clamped state. A cylindrical portion 8 that is slidable in the through hole 3 is formed in the front part of the clamp bar 7.
Ball holes 9 are formed radially in the holes 9, and steel balls 11 are inserted into the ball holes 9.

On the other hand, a flange 4 is formed in the middle part of the through hole 3, a clamp bar 7 is inserted into the flange 4 from the front, and a coil spring 13 is inserted between the flange 4 and a nut 12 screwed onto the rear end of the clamp bar 7. The drawbar 1 is attached to the rear end of the clamp bar 7.
4 is coming.

Further, the front part of the through hole 3 is formed into a large diameter part 5, and around the through hole 3 on the front surface of the chuck body 2, a ring-shaped, for example, convex tooth 16, which forms one side of the carby coupling 15, is provided concentrically with the through hole 3. Fix it with.

Further, a substantially ring-shaped block 21 is fixed around the front surface of the chuck body 2, and six clamp pistons 22 are installed radially in this block 21. The clamp piston 22 is slidably fitted into a cylinder 23 formed in the block 21, and is guided by a guide rod 24 while being prevented from rotating by a half-moon key 25.

A center 32 is provided protruding from the front surface of the face plate 31, and a drive pin 33 and a safety pin 34 are provided protrudingly opposed to each other in the diametrical direction with the center 32 in between.
A shaft portion 35 is provided protruding from the center of the rear surface. A cylindrical portion 8 at the front of the clamp bar 7 is attached to the rear end of this shaft portion 35.
A large diameter portion 36 is formed to be slidably fitted therein.
Further, around the rear surface of the face plate 31, a ring-shaped concave tooth 17 forming the other half of the carbyk coupling 15 is fixed.

On the other hand, a center hole Hc and opposing pin holes Hp, Hp are formed on the end face of the journal boss B at the end of the crankshaft W to be machined. Make the outer diameter slightly smaller.

In the above description, when assembling the face plate 31 into the chuck body 2 depending on the type of crankshaft W, the draw bar 14 is first advanced, and thereby the clamp bar 7 is advanced against the spring 13. Then, a face plate 31 is placed inside the cylindrical portion 8 of the clamp bar 7.
After inserting the shaft portion 35, the draw bar 14 is moved backward, and thereby the clamp bar 7 is moved backward due to the bias of the spring 13. At this time, the steel balls 11 of the cylindrical part 8 of the clamp bar 7 are drawn into the middle part from the large diameter part 5 at the front of the through hole 3, so the steel balls 11 are pushed toward the center of the through hole 3. The front surface of the large diameter portion 36 of the face plate shaft portion 35 is pressed, and the face plate 31 is thus clamped by the shaft portion 35.

Furthermore, when such a clamp is operated, the carbyk coupling 15 is engaged at the same time, so that the centering of the face plate 31 is automatically performed by the carbyk coupling 15.

The face plate 3 assembled into the chuck body 2 as described above
The center hole Hc of the journal boss B of the crankshaft W and the pin holes Hp and Hp are engaged with the center 32 and pins 33 and 34 of the block 21, and working fluid is supplied into each cylinder 23 of the block 21 to close each clamp piston. 22... is advanced. As a result, each clamp piston 22 radially extends from the outer circumference of the journal boss B.
... to clamp the crankshaft W.

Thereafter, the main shaft 1 is rotated to perform desired processing.

In this way, since the face plate 31 is simply replaced according to the type of crankshaft W, the replacement work can be facilitated.

Moreover, simultaneously with the clamping of the face plate 31 by the chuck means 6, the centering of the face plate 31 can be automatically performed by the carboxylic coupling 15.

And crankshaft W journal boss B
Since the clamp pistons 22 for clamping are arranged radially with respect to the journal boss B, accurate clamping corresponding to the outer diameter of the journal boss B can be performed.

(Effects of the invention) As described above, according to the invention, the front face is provided with an engagement protrusion facing into the engagement recess formed in the end face of the crankshaft, the shaft part is provided in the center of the rear face, and Surrounding the chuck is a face plate with one tooth of a carbyk coupling ring, a clamping means provided within the chuck body for removably clamping the face plate at the shaft, and a car attached to the face plate clamped by the clamping means. The other tooth of the chuck cup ring is provided on the chuck body to engage with one tooth of the chuck cup spring, and the teeth are arranged radially on the chuck body to clamp the outer periphery of the end of the crankshaft that is engaged with the face plate. In addition, the chuck device consists of a clamp piston that can move in and out toward the center of the face plate, so it can be adapted to the type of crankshaft by simply replacing the face plate, and there is no need to replace anything else, and it is easy to center the face plate. This is also done automatically, making the replacement work easy.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of the main body of the chuck, and FIG. 2 is a cross-sectional view taken along the line shown in FIG. 1. In the drawing, 1 is the main shaft, 2 is the chuck body, 6 is the clamping means, 7 is the clamp bar, 11 is the steel ball, 15 is the carboxylic coupling, and 22
is a clamp piston, 31 is a face plate, 32, 33,
34 is an engaging protrusion, and 35 is a shaft portion.

Claims (1)

[Scope of claim for utility model registration] A chuck provided on the tip of the main shaft,
A chuck device that holds a crankshaft at its end has an engaging protrusion on the front face that faces into an engaging recess formed in the end face of the crankshaft, a shaft part in the center of the rear face, and a shaft around the rear face. A face plate having one tooth of a carbyk coupling; a clamping means provided within the chuck body for removably clamping the face plate at the shaft portion; and a carbyk coupling provided on the faceplate clamped by the clamping means. The other tooth of the carbyk coupling is provided on the chuck body to engage with one tooth of the chuck body, and the other tooth of the carbyk coupling is disposed radially on the chuck body to clamp the outer periphery of the end of the crankshaft engaged with the face plate, and A chuck device for a crankshaft, characterized in that it is composed of a clamp piston that can freely move in and out toward the center of the crankshaft.