CN2468983Y

CN2468983Y - Improved electric jack

Info

Publication number: CN2468983Y
Application number: CN 01209636
Authority: CN
Inventors: 黄佳强
Original assignee: Tiegong Locoomtive & Cars Electronic Co Ltd Guangzhou
Current assignee: Tiegong Locoomtive & Cars Electronic Co Ltd Guangzhou
Priority date: 2001-03-30
Filing date: 2001-03-30
Publication date: 2002-01-02
Anticipated expiration: 2011-03-30

Abstract

The utility model relates to an electric jack which includes a motor and electric control components (including an electric circuit cable, a plug, a control electric circuit plate, a positive stop protection switch plate and a controller). The motor is fixed on the planetary transmission reducer cover to drive the planetary transmission reducer, and reduce speed again though a group of outer meshing cylinder gears and drive the two-stage expansion helix transmission mechanism to move up and down. The transmission of this two-stage expansion up and down movement depends on the friction relation between the screw and the solenoid. The middle of the casing is provided with a manual operation hole. By inserting a manual gear and loosening the motor, people can use a box wrench to operate the hole manually. The utility model is provided with advantages of small size, lightness, simple structure, reliable performance and convenient operation.

Description

The electronic jack of a kind of improved type

The utility model relates to a kind of jack, particularly a kind of electronic jack.

In China Patent No. is ZL99236180.X, and name is called in the file of " a kind of electronic jack ", discloses a kind of electronic jack: by the controller in the electrical control gear assembly, handle the motor operation on the jack.Electrical motor rotates, and by NW type planetary reduction gear reduction of speed, passes through one group of externally-engaged cylindrical gear group reduction of speed once more again, drives the flexible screw mechanism lifting of two-stage at last.

The screw mechanism that the two-stage of this jack is flexible relies on arrangement of clutch to realize switching.This arrangement of clutch is by a hole ring washer, a spring, and straight pin and snap ring match with screw mechanism and constitute.The problem that this arrangement of clutch exists is that straight pin easily jumps; Internal circlip is squeezed easily to be taken off, and spring jumps out; Straight pin falls in the screwed pipe switching process in the top slot less than center bolt sometimes; The activity of snap ring stagnates and hinders, and produces distortion in crowded forcing.The appearance of above-mentioned any situation can both cause the inefficacy of jack.

The purpose of this utility model is to provide a kind of can avoid above-mentioned prior art weak point, make it more reasonable structure, simple and reliable, performance is more superior and the convenient electronic jack of making.

The purpose of this utility model is to reach by following measure: the top of screwed pipe (2) in the middle of sealing with a screw plug (7) makes it to withstand center bolt (1).The top of center bolt (1) is made circular-arc, is withstanding the friction force that rotates under the state to reduce with screw plug (7).In middle screw rod (2) lower end, establish a barrier ring (21).In screw plug (7), in the scantling of structure design of center bolt (1) top and above-mentioned barrier ring (21), consider the continuation campaign of keeping out corresponding negative thread, its radial dimension is not less than the path of corresponding negative thread, and guarantees that from axial dimension certain intensity is enough to keep out the continuation campaign of corresponding negative thread.

Advantage of the present utility model has been to simplify the structure of the flexible screw mechanism of two-stage, has made things convenient for manufacturing, more reliable performance.

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is a schematic appearance of the present utility model;

Fig. 3 is the principle schematic of screw mechanism clutch switching.

Below in conjunction with accompanying drawing embodiment, the utility model is described in further detail:

Consult Fig. 1, Fig. 2, Fig. 3.A kind of electronic jack comprises by base plate (18), housing (6), orienting sleeve (8) and all rivets (20) and forms a frame; Electrical motor (11) is contained on retarder (12) lid, and plastics protective cover (10) is arranged outward, and control circuit board (9) also is housed in the protective cover (10); Retarder (12) is box-packed on housing (6), the output shaft connection of retarder (12) is with the big gear wheel of dual gear (15), and the miniature gears of dual gear (15) connection is being with chassis gear (17), chassis gear (17) is being fastenedly connected center bolt (1), can give screw-drive mechanism the transmission of power of turn.The chassis pinion stand is on thrust ball bearing with flat seat (16), and thrust ball bearing (16) supports whole loads and can rotate flexibly; Screw-drive mechanism mainly is made up of center bolt (1), middle screwed pipe (2), outer screwed pipe (3) and screw plug (7).But additional in addition have the top cap (4) of manual regulation height and work the sleeve (5) that opens and closes upper and lower spacing protection switch effect.

When inserting in the cigarette lighter socket (or directly being connected on the storage battery), just can handle the lifting of jack with the plug (19) of power circuit cable and controller.Push-button controller " lifting " button, control circuit board (9) actuating motor (11) forward rotation.Power by the rotation of NW type planetary reduction gear (12) output reduction of speed, slow down once more by dual gear (15) and chassis gear (17) again, give screw mechanism with the transmission of power of suitable rotating speed, suitable moment, make jack lifting play weight with two-stage Telescopic.

Fig. 3 mainly illustrates the movement relation of the center bolt (1) in the screw mechanism, middle screwed pipe (2), screw plug (7) and outer screwed pipe (3).Wherein, shown in Fig. 3 a be screw mechanism in " virgin state " of jack when packing box takes out that energising is handled: chassis gear (17) is being fastenedly connected center bolt (1).The negative thread of the outside thread of center bolt (1) and middle screwed pipe (2) screws; The screw plug (7) of the top of center bolt (1) and middle screwed pipe (2) end heads on, and the negative thread of the outside thread of middle screwed pipe (2) and outer screwed pipe (3) screws.When electrical motor (11) energising was just being changeed, chassis gear (17) drove center bolt (1) and does left-handed rotation, may drive the middle screwed pipe (2) that screws with it and rise.When rising to its negative thread, middle screwed pipe (2) withstood by the top of center bolt (1), in the time of can not continuing to rise, screwed pipe (2) was done left-handed rotation in the middle of center bolt (1) in continuing to rotate was just driving, and the outer screwed pipe (3) that screws with middle screwed pipe (2) was risen, shown in Fig. 3 b.Outer screwed pipe (3) rises and arrives design-calculated jack lift height; driven the sleeve (5 that rises by outer screwed pipe (3); see Fig. 1); by being fastened on the limit shaft back-up ring (14 on the sleeve (5); see Fig. 1) make the upper limit protection switch closure of position limitation protection key-board (13); cut off motor power, electrical motor stall, outer screw rod (3) thereby stop to rise.

" virgin state " shown in Fig. 3 a, center bolt (1) cooperates with middle screwed pipe (2), and screwing of outer, negative thread arranged, and also has the top to withstand mutually with screw plug (7).If the friction force that above-mentioned condition produces is greater than middle screwed pipe (2) is outer with outer screwed pipe (3), negative thread screws friction force, at first be that screwed pipe (2) was done left-handed rotation in the middle of center bolt (1) had been with, the outer screwed pipe (3) that screws with middle screwed pipe (2) rises.Outer screwed pipe (3) rises to its negative thread and is kept out by screw plug (7) termination and can not continue to rise, and the rotational force of center bolt this moment (1) is enough to overcome it and the friction force of middle screwed pipe (2), makes middle screwed pipe (2) rising that screws with it, shown in Fig. 3 c.Middle screwed pipe (2) rises to design-calculated jack lift height; driven the sleeve (5 that rises by outer screwed pipe (3); see Fig. 1); by being fastened on the limit shaft back-up ring (14 on the sleeve (5); see Fig. 1), make the upper limit protection switch closure on the position limitation protection key-board (13), cut off motor power; the electrical motor stall, middle screwed pipe (2) thereby stop to rise.

The decline operating mode of jack: push-button controller " decline " button, handle the electrical motor counter-rotating, chassis gear (17) drives center bolt (1) and does the dextrorotation rotation.Middle screwed pipe (2) or outer screwed pipe (3) descend in succession by the opposite order of lifting operating mode.The principle of the switching of the flexible screw mechanism of two-stage is the same during with lifting; stopping of descending also is by driven the sleeve (5 that descends by outer screwed pipe (3); see Fig. 1); by being fastened on the limit shaft back-up ring (14 on the sleeve (5); see Fig. 1), make the lower limit protection switch closure on the position limitation protection key-board (13), cut off motor power; the electrical motor stall makes the middle screwed pipe (2) of follow-up decline or outer screwed pipe (3) stop to descend.

Claims

1; the electronic jack of a kind of improved type; by electrical motor (11); electric controling assembly; retarder (12); gear system; screw drive mechanism; base plate (18); housing (6); compositions such as protective cover (10) and manual-operating mechanism; electric controling assembly wherein; plug (19) by band power circuit cable and controller; position limitation protection key-board (13) and control circuit board (9) are formed; gear system; constitute by dual gear (15) and chassis gear (17); screw drive mechanism is by center bolt (1); middle screwed pipe (2) and outer screwed pipe (3) are formed; it is characterized in that: in screw drive mechanism; top in middle screwed pipe (2); the screw plug (7) that has a usefulness negative thread to assemble; the upper end of center bolt (1); cancel clutch slot of the prior art; and be processed into the garden arc; the lower end of middle screwed pipe (2) has been cancelled axle ring washer groove of the prior art and has been set up a barrier ring that fuses with it (21), and the external diameter of this barrier ring (21) is greater than the negative thread path of outer screwed pipe (3).