JPS6135363Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a wedge-type power chuck, and more specifically, to a structure that increases the transmission efficiency of the wedge-shaped piston to the master jack.

Conventional wedge-type power chucks have a free jaw on the front, and a master jaw is inserted into the chuck body so as to be able to slide freely in the radial direction. The inclined surface contacts the wedge surface of the wedge-shaped piston that moves forward and backward in the center of the chuck body, and the wedge-shaped piston moves forward and backward (in the axial direction of the wedge-shaped piston). The master jaw is configured to act on the inclined surface of the master jaw with which it comes into contact, and the master jaw slides in the radial direction of the chuck body.

A guide rib is formed near the front surface of the sliding side of the master jaw in the sliding direction so that the master jaw accurately slides in the radial direction of the chuck body.

However, the point of action of the wedge-shaped piston on the master jaw is the center of the sliding side surface (which moves slightly due to the movement of the piston), and therefore there is a distance in the axial direction between the guide rib and the point of action. A bending force is applied to the guide ribs, reducing transmission efficiency and causing wear and deformation of the guide ribs.

In view of this problem, the present invention aims to eliminate the force in the bending direction by providing two guide ribs and locating the point of action of the piston at the center of the two guide ribs.

Hereinafter, the present invention will be explained based on the embodiments shown in the drawings.

Fig. 1 shows a vertical side view of the wedge type power chuck of the present invention, Fig. 2 shows a plan view of the same main part, and Fig. 3 shows a front view of the same part. is slidably inserted in the chuck body 1 in the radial direction.

A wedge-shaped piston 3 is fitted into the center of the chuck body 1 so as to be able to move forward and backward in the longitudinal direction (in the axial direction of the piston), and the wedge surface of the wedge-shaped piston 3 and the central side surface of the chuck body 1 of the master jaw 2 are connected to each other. A conventional wedge type in which the master jaw 2 slides in the radial direction of the chuck body 1 as the wedge-shaped piston 3 advances and retreats, and the free jaws 7 grip or release the workpiece. It has a universal configuration of power chuck.

Two guide ribs 5 and 6 are formed in the sliding direction at an interval before and after the sliding side surface 10 of the master jaw 2 with respect to the chuck body 1, and the master jaw 2 of the wedge-shaped piston 3 The point of application of the force to is located approximately at the center A between the guide ribs 5 and 6.

Therefore, since the point of action from the wedge-shaped piston 3 on the master jaw 2 acts on approximately the center of the two guide ribs 5 and 6, the guide ribs 5 are located approximately equidistant in opposite directions from the point of action. , 6 act in opposite directions and have the same force, so they cancel each other out, and the master jaw 2 acts only in the radial direction of the chuck body 1, which is the direction of the guide ribs 5 and 6. The guide ribs 5 and 6 are not affected.

As described above, the present invention has two guide ribs 5 and 6.
By forming the guide ribs in a specific positional relationship, it is possible to remove the bending force generated on the guide ribs when the master jaw 2 slides.The formation of two guide ribs is different from the conventional scroll chuck or However, this invention does not recognize the problem that the present invention aims to solve, nor does it imply that the point of action should be centered. This solved the problem.

Therefore, the present invention solves the drawback that the transmission efficiency of the wedge-shaped piston is significantly deteriorated due to the force acting in the bending direction on the guide surface generated in the conventional single guide rib, and can improve the transmission efficiency. Coupled with the increased number of contact surfaces during sliding, reliable and smooth sliding can be expected, and it has the effect of providing good wear resistance and preventing deformation of the guide ribs.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of the chuck of the present invention, FIG. 2 is a plan view of the main part, and FIG. 3 is a partial front view. Symbols: 1 is the chuck body, 2 is the master jaw, 3 is the wedge-shaped piston, 4 is the inclined surface of the wedge-shaped piston, 5 is the guide rib, 6 is the guide rib, 7 is the free jaw, and 10 is the sliding side surface.

Claims (1)

[Scope of utility model registration request] A master jaw 2 has a free claw 7 on the front surface, is slidably inserted in the chuck body 1 in the radial direction, and has an inclined surface 4 on the side of the center of the chuck body 1;
The chuck body 1 has a wedge-shaped piston 3 that moves back and forth in the longitudinal direction of the center of the chuck body 1 and comes into contact with the inclined surface 4 of the master jaw 2. As the model piston 3 advances and retreats, the master jaw 2 moves toward the center of the chuck body 1. In a wedge-type power chuck that slides in the radial direction,
Two guide ribs 5 and 6 are formed in the sliding direction at intervals on the front and back of the sliding side surface 10 of the master jaw 2, and the point of force application of the master jaw 2 is set approximately at the center of the two guide ribs 5 and 6. A wedge-shaped power chuck that is characterized by its position in the market.