CN2902595Y

CN2902595Y - Cam structure of electric, pneumatic screw driver

Info

Publication number: CN2902595Y
Application number: CN 200620058011
Authority: CN
Inventors: 李晋印
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-04-21
Filing date: 2006-04-21
Publication date: 2007-05-23
Anticipated expiration: 2016-04-21

Abstract

The utility model relates to an electric or pneumatic screwdriver technical field, in particular to a cam structure of an electrical screwdriver or a pneumatic screwdriver, a annular recess is opened on the cam and a torque jumping-off plate, and the annular recess is fully filled with steel balls so that the cam and a drive shaft are combined, and the cam and the torque jump-off plate are fastened by the steel balls to fasten the relevant components, when in use, the operation is stable without excursion, the cam portion of the cam is in a hanged state in the torque jump-off plate, so that a certain space is always maintained between the cam portion of the cam and the torque jump-off plate, so the accurate and stable set torque values can be maintained in a long run. The grades of slope of the inclined surface at two sides of the cam portion relative to the orbital plane are different, so the back acting output torque is greater, the screw can be withdrew one time when removing a screw without multiple operation or adjusting the torque force, the operation is more convenient and the working efficiency is increased.

Description

The cam structure of a kind of electricity, Pneumatic screw driver

Technical field:

The utility model relates to electricity, Pneumatic screw driver technical field, refers in particular to the cam structure of a kind of electricity, Pneumatic screw driver.

Background technology:

Shown in Fig. 1,2,3 present electricity, the cam structure of Pneumatic screw driver, because its structural design is unreasonable, have several point defects: can be offset by occurred level when the fulcrum 2 of power transmission shaft 1 rotates in cam 8, cause its torque value easily to fluctuate, the torsion precision is not high; In addition, because the wearing and tearing of self, cause the degree of depth of the inside groove of cam 8 to increase, power transmission shaft 2 highly reduces simultaneously, can cause the raised points 4 of cam 8 and the gap between the face 6 on the torsion escape dish 5 too small after long-term the use, this moment, escape steel ball 3 was inoperative, the size of the frictional force between the raised points 4 that the actual torsion output valve of electricity, Pneumatic screw driver is a cam 8 and the face 6 of power transmission shaft 1, at this moment the clutch of electricity, Pneumatic screw driver just occur can't escape phenomenon, the outputting torsion value of this moment is very big, then fragile workpiece; Inclined-plane, raised points 4 both sides on the cam 8 is identical to the gradient of orbital plane, so the torque value that bottle opener is exported when rotating and reverse also is identical, again it is withdrawed from as needing after using screw of same torque value locking, the situation that is difficult for or is difficult to withdraw from then can appear withdrawing from, therefore need repeatedly reverse operating, perhaps adjusting torsion adjustment ring increasing torsion could take out screw, manipulates inconvenience.

The utility model content:

The purpose of this utility model be at the deficiencies in the prior art provide a kind of simple in structure, and can overcome a kind of electricity of above shortcoming, the cam structure of Pneumatic screw driver.

For achieving the above object, the utility model is achieved through the following technical solutions: it comprises cam, torsion escape dish, one cam rail face is arranged on the cam, orbital plane is provided with two raised points, two raised points cooperate with escape steel ball on the torsion escape dish, the outer rim of described cam and torsion escape dish are provided with the cannelure that cooperatively interacts, and are equipped with stationary cam in the cannelure and make two raised points be the steel ball of hanging shape, have the hole that is communicated with cannelure on the cam.

The inclined-plane of described raised points both sides is unequal to the gradient of orbital plane, along be rotated counterclockwise direction one in the face of big than dextrorotation veer of the sinusoidal absolute value of the angle of orbital plane, such outputting torsion when counterclockwise is greater than clockwise outputting torsion.

The utility model is to drive a cannelure on cam and torsion escape dish, and at cannelure filling steel ball, cam and power transmission shaft are combined, fastening cam of steel ball and torsion escape dish, make each associated components fastening, when being turned round with cam, power transmission shaft remains on the same concentric circles, can reduce skew in the running as far as possible, thereby improved the stability of power transmission shaft, improved electricity in the past, each member horizontal direction of Pneumatic screw driver clutch pack is not fastening and the error and the torsion of the work running torsion that deviation causes that causes are exported unsettled situation; The raised points of cam is vacant state in torsion escape dish, make between cam lobe point and the torsion escape dish and remain certain clearance, so in vertical direction just can not be too small because of the gap between cam and power transmission shaft, frictional force increases and causes the outputting torsion value excessive, therefore can keep accurately stable setting torque value after the improvement long-lastingly; The inclined-plane of raised points both sides is unequal to the gradient of orbital plane, along the one side of dextrorotation veer than being rotated counterclockwise the big of direction, therefore under the situation of uncomfortable economize on electricity, Pneumatic screw driver outputting torsion, when rotating counterclockwise, its outputting torsion is big, can disposable taking-up screw when withdrawing from screw, and needn't multi-pass operation or regulate torsion, more convenient operation has improved operating efficiency.

Description of drawings:

Accompanying drawing 1 is existing electricity, the cam of Pneumatic screw driver and the structural representation of torsion escape dish

Accompanying drawing 2 is the structural representation of the cam of existing electricity, Pneumatic screw driver

Accompanying drawing 3 is the stereogram of the cam of existing electricity, Pneumatic screw driver

Accompanying drawing 4 is the structural representation of the utility model embodiment 1

Accompanying drawing 5 is the structural representation of the cam of the utility model embodiment 1

Accompanying drawing 6 is the horizontal projection of accompanying drawing 5

Accompanying drawing 7 is the structural representation of the utility model embodiment 2

Accompanying drawing 8 is the built-in plane of the cam ball thrust bearing structural representation of utility model embodiment 2

The specific embodiment:

Embodiment sees accompanying

drawing

4,5,6,7,8, it comprises cam 8, torsion escape dish 5, one cam rail face 9 is arranged on the cam 8, orbital plane 9 is provided with two raised points 4, two raised points 4 cooperate with escape steel ball 3 on the torsion escape dish 5, described cam 8 outer rims and torsion escape dish 5 are provided with the annular inside groove 10 that cooperatively interacts, 11, have the hole 12 that is communicated with cannelure 10 on the cam 8, described hole 12 is a screwed hole, 12 fillings enter in the cannelure 10 steel ball 13 from the hole, and steel ball 13 is arranged in a circle around cannelure 10, and steel ball 13 is loaded and finished, one screw that cooperates with described screwed hole is screwed in the hole 12, prevent that steel ball 13 from leaking outside.13 pairs of cams 8 of steel ball and torsion escape dish 5 play the role of fastening, cam 8 and torsion escape dish 5 are combined as a whole, and make two raised points 4 of cam 8 be in vacant state in torsion escape dish 5, escape steel ball 3 is installed on the torsion escape dish, and cooperates with two raised points 4.Because the acting in conjunction of steel ball 13 and cannelure 10,11, power transmission shaft 1 and cam 8 then are difficult for being offset in the running, can steady running, thus keeping stable outputting torsion, torque value is more accurate, keeps accurate stable setting torque value long-lastingly.

Two raised points 4 of described cam 8 are designed to vacant state, make between the face 6 of the raised points 4 of cam and torsion escape dish 5 and remain certain clearance, prevent that the frictional force that causes because of the gap between cam 4 and the face 6 is too small in vertical direction from increasing, the situation that the outputting torsion value is excessive, also can prevent that the long-time back escape steel ball 3 that uses can't escape, torque value is bigger than normal, defective work piece.

The gradient of 14, the 15 pairs of orbital planes 9 in inclined-plane of described raised points 4 both sides is unequal, along big than counterclockwise 15 direction of rotation of the gradient of 14 pairs of orbital planes 9 of one side of dextrorotation veer, be α＞β, the direction of arrow that indicates is clockwise direction among Fig. 5, the resistance of the 15 pairs of escape steel balls 3 in resistance ratios inclined-plane that is the 14 pairs of escape steel balls 3 in inclined-plane is big, thereby makes the electro-pneumatic bottle opener have bigger outputting torsion when reversing.This design has bigger outputting torsion when electricity, Pneumatic screw driver are reversed under same setting torque value, therefore it is taken out as needing after screwing screw again, then can disposablely withdraw from the screw that has screwed rapidly, saves man-hour, increases work efficiency.

Embodiment 2 shown in Figure 7 installs a plane ball thrust bearing 18 and a plane needle roller thrust bearing 17 in the inside groove 16 of cam 8, two bearings is in order to fastening power transmission shaft 1 and cam 8, wherein, fastening in the horizontal direction power transmission shaft 1 of plane ball thrust bearing 18 and cam 8, plane needle roller thrust bearing 17 then mainly works in vertical direction, prevent between cam 8 and the power transmission shaft 1 that because of friction makes the too small torsion that causes in gap between it excessive, it is smooth and easy to keep power transmission shaft 1 to turn round simultaneously in cam 8.Its effect is identical with the cooperation of steel ball 13 and cannelure 10,11 with principle, is used to reduce the torsion error that skew brought because of power transmission shaft 1; Guarantee that power transmission shaft 1 running is smooth and easy and stable.

It only is preferred embodiment of the present utility model that above institute is chatted, so all equivalences of doing according to the described structure of the utility model claim, feature and principle change or decorate, is included in the utility model claim.

Claims

1, a kind of, the cam structure of Pneumatic screw driver, it comprises cam (8), torsion escape dish (5), one cam rail face (9) is arranged on the cam (8), orbital plane (9) is provided with two raised points (4), two raised points (4) cooperate with escape steel ball (3) on the torsion escape dish (5), it is characterized in that: the outer rim of described cam (8) and torsion escape dish (5) are provided with cannelure (10) and (11) that cooperatively interact, cannelure (10,11) be equipped with stationary cam (8) and torsion escape dish (5) in and make two raised points (4) be the steel ball (13) of hanging shape, have the hole (12) that is communicated with cannelure (10) on the cam (13).

2, the cam structure of electricity according to claim 1, Pneumatic screw driver, it is characterized in that: described raised points (4) inclined-plane, both sides (14) and (15) are unequal to the gradient of orbital plane (9), along the one side (15) of dextrorotation veer to the gradient of orbital plane (9) than being rotated counterclockwise the big of direction.