CN2182300Y

CN2182300Y - Two-purpose screw arbor mechanism

Info

Publication number: CN2182300Y
Application number: CN 93247944
Authority: CN
Inventors: 张仰彪
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-12-17
Filing date: 1993-12-17
Publication date: 1994-11-09
Anticipated expiration: 2003-12-17

Abstract

The utility model relates to a dual-purpose threaded rod mechanism which belongs to a screw driving device. A threaded rod 1 which is a differential threaded rod is split into a left segment and a right segment with unequal length, a nut 2 is sheathed on the long threaded rod of the left segment and a nut 4 and a nut 6 are sheathed on the short threaded rod of the right segment. A spring 5 is pressed between the nut 4 and the nut 6, so that frictional moment (M) is generated between the nut 4 and the threaded rod 1. When the utility model is applied to a pair of vice in idle stroke, the nut 4 rotates synchronously as the threaded rod 1 under the action of the frictional moment (M), and the threaded rod 1 is converted into an ordinary threaded rod which can pass over the idle stroke quickly. After the utility model enters a clamping stroke, the nut 4 is pressed on a movable clamp body 10 as the clamping force is increased and the nut 4 does not rotate as the threaded rod 1 any longer. The threaded rod 1 is still the differential threaded rod, and force can be saved by 5 to 10 times.

Description

Two-purpose screw arbor mechanism

The utility model relates to a kind of helicoidal gear one double-purpose screw mechanism, is applicable to vice and other fastening device.

Differential screw mechanism is simple in structure and very laborsaving, is a kind of helicoidal gear of superior performance, but compares with common screw mechanism, and it exists, and stroke is short, transmission speed slow, occupy shortcomings such as the space is big, and its application area is very limited.

Task of the present utility model provides a kind of differential screw mechanism use that both can be used as, and can be used as the double-purpose screw mechanism that common screw mechanism uses again.

Below with reference to accompanying drawing the utility model is explained in detail.

Accompanying drawing is the structure sectional view of the utility model when being applied to vice.

With reference to accompanying drawing, screw rod 1 is differential screw arbor, be divided into be uneven in length about two sections, and left section screw rod is longer than right section screw rod, about two sections screw flight rotation directions identical, but pitch difference, and the pitch of right section screw rod of the pitch ratio of left section screw rod is big, is milled with the four directions at the right-hand member of screw rod 1, and crank 7 is housed.

Nut 2 screws on left section screw rod of screw rod 1, and its left side is with shoulder.

Nut 4 screws on the right section screw rod of screw rod 1, and its right side has big shoulder, and the left side of big shoulder has little shoulder again, is shaped on six along the equally distributed circular blind hole of circumference on nut 4 right sides, is shaped on a circular cone hole on nut 4 left side cylindricals.

Nut 6 also screws on the right section screw rod of screw rod 1, and is positioned at the right of nut 4, and and nut 4 between leave the gap.The diameter of nut 6 is identical with the diameter of the big shoulder in nut 4 right sides, and its right side has little shoulder.Be shaped on a screw on the end face of nut 6, screw in the oval styletable Cock screw 8 of fluting in the hole, the end of screw 8 can be inserted respectively in six circular blind holes of nut 4 right sides, and realizes Spielpassung, makes between nut 4 and the nut 6 and can not relatively rotate.

Cylindrically coiled spring 5 is pressed between the little shoulder of the little shoulder of nut 4 and nut 6, under the effect of its elastic force, produces a friction torque M between nut 4 and the nut 6 threaded 1.

When the utility model is applied to vice, nut 2 is fixed on the fixedly vice body 12 of vice, 4 on nut is enclosed within Spielpassung in the unthreaded hole of movable vice body 10 afterbodys, locking back-up ring 3 at the left side of nut 4 mounting strap fluting awl end Cock screw 9 also can freely rotate nut 4 axially locating in unthreaded hole.During use, clockwise rotate screw rod 1 with crank 7, movable vice body 10 is moved to the left, in idle stroke, the required power of screw rod 1 drive activity vice body 10 is very little, nut 4 and nut 6 just rotate with screw rod 1 under friction torque M effect synchronously, make screw rod 1 become common screw, can cross idle stroke fast.When movable vice body 10 touch workpiece 11 and enter clamp stroke after, the clamping force that screw rod 1 produces sharply increases, nut 4 just is pressed on the movable vice body 10, no longer rotate with screw rod 1, make screw rod 1 become differential screw rod, be rotated further crank 7, can produce huge clamping force, be up to 3500 kilograms.

After processing, rotate counterclockwise screw rod 1 with crank 7, along with workpiece 11 is released, clamping force reduces rapidly, the nut 4 that is pressed on movable vice body 10 afterbodys is also unclamped again, so nut 4 and nut 6 rotate with screw rod 1 under friction torque M effect again synchronously, make screw rod 1 become common screw again, can drive activity vice body 10 moving to right fast retreats.

Advantage of the present utility model: (one) integrates the advantage of common screw mechanism and differential screw mechanism, not only can economize 5-10 power doubly, and transmission speed is fast, stroke long, it is little to occupy the space.(2) simple in structure, economical and practical, comparing with differential screw mechanism has only increased several findings.(3) easy and simple to handle, between common screw mechanism and differential screw mechanism according to the size variation of clamping force and automatic conversion.(4) can undergo technological transformation to industrial existing a large amount of vices, as long as will have the original unthreaded hole boring of movable vice body 10 afterbodys of vice now even as big as holding nut 4, the utility model both can change the outfit.

Claims

1, a kind of by screw rod (1), nut (2), back-up ring (3), nut (4), spring (5), nut (6), crank (7), the double-purpose screw mechanism that Cock screw (8) and Cock screw (9) are formed, it is characterized in that screw rod (1) is differential screw rod, be divided into be uneven in length about two sections, and left side section screw rod is longer than right section screw rod, about two sections screw flight rotation directions identical, but pitch difference, and the pitch of the right section of the pitch ratio screw rod of left side section screw rod is big, the right side of nut (4) has big shoulder, the left side of big shoulder has little shoulder again, the diameter of nut (6) that the right side has little shoulder is identical with the diameter of the big shoulder in nut (4) right side, the nut (2) that the left side has shoulder screws on the section screw rod of the left side of screw rod (1), nut (4) and nut (6) all screw on the right section screw rod of screw rod (1), and nut (6) is positioned at nut (4) the right, and and nut (4) between leave the gap, spring (5) is pressed between the little shoulder of the little shoulder of nut (4) and nut (6).

2, double-purpose screw mechanism according to claim 1 is characterized in that being shaped on nut (4) right side six along the equally distributed circular blind hole of circumference.

3, double-purpose screw mechanism according to claim 1 is characterized in that being shaped on a screw on nut (6) end face, and Cock screw (8) is housed in the hole.

4, double-purpose screw mechanism according to claim 1 is characterized in that being installed in the back-up ring (3) of Cock screw (9) left side of nut (4).