CN2211869Y

CN2211869Y - Self-fastening drill chuck

Info

Publication number: CN2211869Y
Application number: CN 95239257
Authority: CN
Inventors: 秦东杰
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-02-22
Filing date: 1995-02-22
Publication date: 1995-11-08
Anticipated expiration: 2005-02-22

Abstract

The utility model relates to a self-fastening drill chuck which is suitable for various cutting machine tools, electric hand drills, etc. The utility model is provided with a clamping jaw whose outside is provided with a clamping sleeve connected with a clamping chuck body; a driving core is arranged in the clamping chuck body; a bearing is arranged between the driving core and the clamping chuck body; the driving core is matched with a driven body movably connected with the clamping jaw; the driving core is matched with the driven body by screw threads between which a ball is arranged. The drill chuck has the advantages of small starting moment of self-tightening action, wide self-tightening range, and self-tightening action on various specifications of drill chucks.

Description

Self-fastening drill chuck

The utility model relates to the anchor clamps of drilling cutters in the lathe.

Self-tightening drill chuck of the prior art, critical piece has jaw and overcoat thereof, overcoat is connected with collet body, and core retainer plate is arranged in the collet body, and screw thread is arranged in the core retainer plate, an end device screw rod in the core retainer plate, when drill chuck when rotated, core retainer plate cooperates with screw flight and produces reaction force, the end of screw rod promotes jaw, force jaw along the inclined-plane of chuck to lower slider, automatic fastening drill bit.It is the sliding friction that relies between core retainer plate and screw flight, and the self-tightening effect takes place.Sliding friction torque is bigger, makes the self-tightening sphere of action of this kind drill chuck be subjected to certain limitation, and for the little drill bit of diameter, the self-tightening effect is fainter.

The purpose of this utility model is to design the big drill chuck of a kind of self-tightening sphere of action.

The jaw that the utility model one end is made up of many lobes, jaw outside device gripping sleeve, gripping sleeve is connected with screw with an end of collet body, and the transmission fuse is arranged in the collet body, and the transmission fuse is contained on the machine power output shaft, between transmission fuse and the collet body bearing is installed, bearing is fixed with gland, and the transmission fuse cooperates with driven member, and driven member becomes to flexibly connect with jaw, it is characterized in that transmission fuse and driven member threaded engagement, ball is housed between the screw thread.

When this drill chuck rotates, owing to install ball between screw rod body and the swivel nut, sliding friction between screw thread in the prior art is become rolling friction, thereby moment of friction is greatly reduced, the self-tightening effect is greatly strengthened, the self-tightening scope obviously increases, and for the drill bit of all size specification, can both play the self-tightening effect.

Fig. 1 is the utility model embodiment 1 cut-away view.

Fig. 2 is the cut-away view of the utility model embodiment 2.

Below in conjunction with accompanying drawing embodiment is further specified.

Embodiment 1, see Fig. 1, (9) are jaw among the figure, (8) be its gripping sleeve, (4) be collet body, (10) are screw, and (1) is the transmission fuse, the one end is enclosed within on the machine power output shaft, the other end (11) is the screw rod body, and (7) are the swivel nut of its outside, and (6) are ball, (5) be bearing, (3) be gland, (2) are anti-reverse tooth plate, and the end face of its end face and collet body (4) all has unidirectional tooth, the two unidirectional tooth flank of tooth are chimeric mutually, between gland (3) and the collet body with being threaded.Wherein transmission fuse (1) is an active body, and the random device power output shaft rotates synchronously, and swivel nut (7) is a driven member, and it is installed between screw rod body (11) and the collet body (4).Between screw rod (11) and the swivel nut (7) spin (6) is installed, swivel nut (7) rolls with screw rod (11) and rotates, and moves up and down, and it becomes to flexibly connect by hook and groove with jaw (9).The preparation of this drill chuck: throw off anti-reverse tooth plate (2) earlier, unscrew collet body (4) and gripping sleeve (9), each lobe of jaw (9) is unclamped, drill bit is inserted jaw (9), use hand-screw clinch ear body (4) again, tentatively clamp drill bit by jaw (9).The course of work of this drill chuck: after the drill chuck rotation, when drilling moment during greater than the moment of friction between jaw and drill bit, this moment is by the aforementioned rolling screw mechanism that is made of screw rod, ball, swivel nut, force swivel nut to move downward, the end of swivel nut promotes jaw, the conical surface along gripping sleeve (8) slides, and along with drill chuck is rotational automatic drill bit is clamped.Because the self-tightening effect starting torque of rolling screw mechanism is littler than sliding friction screw mechanism, so the utility model self-tightening scope obviously increases, the self-tightening effect greatly strengthens, and also can play the self-tightening effect for the drill bit (for example diameter is less than 8mm) of some minor diameters.

Embodiment 2: its basic structure difference from Example 1 is the inner chamber machining screw at collet body (17), the interior on-line equipment of collet body (17) is positioned at the screw rod (21) of transmission fuse one end, the threaded engagement of this screw rod and collet body inner chamber, install ball (15) therebetween, so, screw rod (21) is as active body, and collet body (17) is directly as driven member, and collet body is connected with the gripping sleeve (18) of jaw (23) by screw (20); Screw rod joins by ball (19) and power transmission cover (22), and power transmission cover (22) is connected with screw rod by screw, and power transmission cover (22) becomes to flexibly connect with jaw (23) by hook and groove.Install cushion cover (16) between screw rod (21) and collet body (17) and the gripping sleeve (18).All the other structures are identical with embodiment 1.When the mandrel rotation, screw rod (21) rotation drives collet body (17) rolling rotation, and gripping sleeve (18) is rotated up, and forces jaw to clamp.

Claims

1, self-tightening drill chuck, one end is by the jaw of being made up of many lobes, jaw outside device gripping sleeve, gripping sleeve is connected with screw with an end of collet body, and the transmission fuse is arranged in the collet body, between transmission fuse and the collet body bearing is installed, bearing is fixed with gland, and the transmission fuse cooperates with driven member, and driven member becomes to flexibly connect with jaw, it is characterized in that transmission fuse and driven member threaded engagement, ball is housed between the screw thread.

2, by the said drill chuck of claim 1, it is characterized in that transmission fuse (1) one end is screw rod body (11), said driven member is swivel nut (7), and swivel nut (7) is installed between screw rod body (11) and the collet body (4), installs ball (6) between screw rod body (11) and the swivel nut (7).

3, by the said drill chuck of claim 1, it is characterized in that transmission fuse (24) one ends are screw rod body (21), the inner chamber of collet body (17) is processed with screw thread, this screw thread cooperates with screw rod (21), install ball (15) therebetween, screw rod (21) joins by ball (19) and power transmission cover (22), and power transmission cover (22) is connected with screw rod (21) by screw, power transmission cover (22) by collude, groove becomes flexible connection with jaw (23).