CN1159206C

CN1159206C - Electric jack

Info

Publication number: CN1159206C
Application number: CNB991272552A
Authority: CN
Inventors: 顾新虎
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-12-30
Filing date: 1999-12-30
Publication date: 2004-07-28
Anticipated expiration: 2019-12-30
Also published as: CN1257023A

Abstract

The present invention relates to the technical field of electric jacks, which is designed for improving the work stability. The present invention comprises a jack shell, a screw-rod group, a speed reduction screw-wheel box, a motor and a switch. The present invention is characterized in that a power shaft is sheathed with a gear; an elastic off-axis apparatus is arranged between the gear and the power shaft, and the gear is engaged with a gear connected with the lower end of a screw rod simultaneously; the end surface of the gear and the end surface of a supporting gear on the lower surface of the gear are provided with plane lug bosses which are mutually staggered, and an elastic element is supported between the two end surfaces; the supporting gear on the lower surface of the gear is engaged and connected with the other coaxial gear on the power shaft. The present invention has the advantages of simple structure, low production cost and good work stability, and is suitable to be popularized and applied on the electric jack.

Description

Electronic jack

Technical field

The present invention relates to jack, especially electronic technical field of jacks.

Background technology

Electronic jack is car, utility van remove a tyre standby gear.Along with living standards of the people improve constantly, car is just progressing into family, people to not only laborsaving, but also the electronic jack of time-saving more the parent look at.Electronic jack has automatic hold function in using at present, and the dependence electronic circuit that it has is realized, when the act of jack top weighs thing, working current can reach very big value, relay, electric capacity are punctured, cause control setup malfunctioning, and their manufacturing prices are also high.China Patent No. is in 92238696.X, 95229669.1 the electronic jack control mechanism mechanical position limitation mechanism to be set, and avoids more above-mentioned shortcomings to a certain extent.But these electronic jacks are not provided with automatic transmission, so fast lifting can't reach zero load the time, moment is little, lifting at a slow speed during load, and many work-hourses are wasted in the big requirement of moment again.It is 94248081.3 Chinese patent " jack " that similar problem also is present in the patent No., it has adopted sun and planet gear to come transmission, though it is even to make speed-changing mechanism transmit momentum, but can't carry out speed change automatically, so no matter zero load or at full load, rotating speed, moment is to be more or less the same, cause user of service's inconvenience, it has adopted magnet contactor to control the lifting work of jack in addition, thus there is above-mentioned problem inevitably, when weighing thing as lifting when the jack top, working current can reach very big value, easily make magnet contactor, relay, component breakdowns such as electric capacity cause control setup malfunctioning, so need us to do further improvement.

Summary of the invention

The object of the present invention is to provide a kind of simple in structure, manufacturing cost is lower, can automatic speed changing the electronic jack of working stability again.

Technical scheme of the present invention is to realize like this.This electronic organic shell, screw mandrel group, reducing gearbox, motor, switch of comprising, output gear meshes again by gear cluster and drives screw mandrel lower end gear in the screw mandrel group in the reducing gearbox, it is characterized in that: be with gear on the described dynamical axis, elasticity is installed from axial organ between this gear and the dynamical axis, this gear gear with the screw mandrel lower end that is connected with a joggle again simultaneously, this gear face and below it supporting gear end face have the plane boss that staggers mutually, and have elastic component between the two sides, below this supporting gear again with dynamical axis on another in-line gears be connected with a joggle.

Compared with prior art, the invention has the advantages that: this electronic jack speed-change control device structure is simple, productive costs is also lower, and can not produce because of the excessive puncture electric capacity of working current, relay phenomenon, better working stability, and adopt the design of manual or electronic dual-purpose, and making things convenient for users, no-load speed is fast, can save time, speed change is sensitive reliably simultaneously, compact conformation is reasonable, suits to promote the use of in power tool.

Description of drawings

Fig. 1. electronic jack structure cutaway view;

Fig. 2. limiting device structure cutaway view;

Fig. 3. the control circuit schematic diagram;

Fig. 4. elasticity is from axial organ structure cutaway view.

The specific embodiment

Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.

As shown in the figure, this electronic jack includes casing, screw mandrel group 20, reducing gearbox 2, motor 1, switch, upper gear of motor shaft and reducing gearbox input gear are connected with a joggle, reducing gearbox output shaft 5 connects into independent one by axle sleeve and supporting base 7, and insert the last lower plate 23 that formula is installed in gear cluster by the slotted hole that train wheel bridge is opened, among 24, the reducing gearbox output shaft cogs and 6 can or break away from gear cluster middle gear 8 engagement, train wheel bridge following 3 has corresponding duct and tapped bore with reducing gear box body edge, is connected and fixed with adjusting bolt 4.Gear 8 is fixed among the lower plate by center shaft 9 and axle sleeve, this goes up in-line gears, and to stretch out casing outside and be fixed in 10 engagements that cog of dynamical axis 11 among the lower plate by axle sleeve with an end again, and end 22 can the hand handle of socket outside dynamical axis stretched out train wheel bridge, openings in enclosure.This dynamical axis is provided with gear 12, this above gear dynamical axis be with a gear 13 again, be provided with elasticity from axial organ 25 between this gear and the axle, this elasticity is shaped on the duct between axle sleeve and the dynamical axis below the axial organ structure is gear, be provided with hoodle or pin in the duct, the outside is surrounded by elastic steel sheet, elastic steel sheet by screw retention on casing,

gear

13 and 17 engagements of screw mandrel cocainine bar lower end bonded assembly gear, this gear and support it below it and be fixed between supporting gear 15 end faces in the lower plate and have the plane boss that staggers mutually by axle sleeve, also propped up wavy spring elastic element 16 between above-mentioned two gear faces, also be provided with wear-resistant block between elastic element and the gear face, steel ball is arranged on the wear-resistant block.Following supporting gear again with dynamical axis 12 engagements that cog, reasonable design is below the supporting gear and also be provided with back-up roller dynamic bearing 14 between the lower plate.Screw mandrel group outer ring 19 is provided with in the limiting device 21 of jump ring 18 and screw mandrel group next door up and down, and tie rod end bayonet socket 211,219 matches.This limiting device structure be limiting device seat 220 tops, bottom respectively perforate be installed with lower link 212,218, there is spring 213,217 on the top between last lower link and the limiting device seat inboard, tie rod end contact moving plate head 214,216 can contact with intermediate contact stator 215 in the limiting device seat or separate up and down, and last lower link is exposed to limiting device seat outer end and is provided with bayonet socket.Its circuit theory is to be connected to a coupled twin switch 35 on the power supply 30 both positive and negative polarity outlet lines, this coupled twin switch can connect two pairs of outlet line contacts 33,34,31,32 respectively, these two pairs of outlet lines connect motor 1 two ends with positive and negative opposite way respectively again, and one the tunnel connects lower link contact moving plate head and lower link contact stator or top rod contact moving plate head and top rod contact stator in the limiting device 21 respectively on every pair of circuit.

Its principle of work process is as follows: during rising, with a pair of outlet line on coupled twin switch contact 33,34 contacts, contact 33 is anodal, connection motor positive pole, contact 34 connect limiting device top rod contact moving plate head, and top rod contact stator and motor negative pole join and form the loop, this moment, motor just changeed the jump ring rising that drives on the screw mandrel, top rod in the jack-up limiting device is thrown off the stall of cutting off the electricity supply until top rod contact moving plate head and contact stator; During decline, coupled twin switch make contact 31,32, positive source connects the motor negative pole, power cathode connects lower link contact moving plate head, lower link contact stator connects the anodal loop that forms of motor, and the jump ring that the motor counter-rotating drives on the screw mandrel descends the jack-up lower link, throw off the stall of cutting off the electricity supply until lower link contact moving plate head and contact stator.

When wanting manual, as long as turn the adjusting bolt, the reducing gearbox output shaft is cogged and the disengaging of gear cluster middle gear, the hand handle of end, outer end socket just can be manual on dynamical axis again.

When the act of jack top weighs thing, screw mandrel is subjected to the outside pressure decay to cause screw mandrel lower end gear and supporting gear end face to mesh and rotate, so rotating speed is just low, and moment is big, cog owing to elasticity is skidded from the axial organ effect with the dynamical axis of this gear mesh, otherwise when lift on no weight top, screw mandrel is subjected to the elastic element effect that screw mandrel lower end gear and supporting gear end face are broken away from, again because moment is little, so in elasticity under the axial organ effect, dynamical axis cogs non-slip and rotates with dynamical axis, and engagement drives the gear rotation of screw mandrel lower end again, makes the screw mandrel high speed rotating and lifting.

Claims

1. electronic jack, it includes casing, screw mandrel group (20), reducing gearbox (2), motor (1), switch, output gear in the reducing gearbox (6) meshes again by gear cluster and drives screw mandrel lower end gear (17) in the screw mandrel group, it is characterized in that: be with gear (13) on the described dynamical axis (11), elasticity is installed from axial organ (25) between this gear and the dynamical axis, this gear gear (17) with the screw mandrel lower end that is connected with a joggle again simultaneously, this gear face and below it supporting gear (15) end face have the plane boss that staggers mutually, and have elastic component (16) between the two sides, below this supporting gear again with dynamical axis on another in-line gears (12) be connected with a joggle.

2. electronic jack as claimed in claim 1 is characterized in that being provided with wear-resistant block between described elastic element (16) and the gear face one side, and steel ball is arranged on the wear-resistant block.

3. electronic jack as claimed in claim 1 is characterized in that being provided with back-up roller dynamic bearing (14) below the described supporting gear (15) and between the lower plate.

4. electronic jack as claimed in claim 1 is characterized in that described switch is:

(1) coupled twin switch (35) is connected on power supply (30) the both positive and negative polarity outlet line, can connect two pairs of outlet line contacts (33,34,31,32) respectively, and these two pairs of outlet lines connect motor (1) two ends with positive and negative opposite way respectively again;

(2) the one road be provided with limiting device (21) on the every pair of circuit in above-mentioned two pairs of outlet lines;

(3) above-mentioned limiting device structure be limiting device seat (220) top, bottom respectively perforate be installed with lower link (212,218), there is spring (213 on the top between last lower link and the limiting device seat inboard, 217), tie rod end contact moving plate head (214 up and down, 216) can contact with intermediate contact stator (215) in the limiting device seat or separate, and go up lower link and be provided with in limiting device seat outer end that the jump ring (18) on the outer ring (19) matches in bayonet socket (211,219) and the screw mandrel group;

(4) a pair of outlet line power supply (30) one utmost points that the driven by motor screw mandrel is risen connect top rod contact moving plate head in the limiting device, and corresponding top rod contact stator connects another utmost point of motor and forms the loop; Make power supply one utmost point of a pair of output line of driven by motor screw mandrel decline connect limiting device lower link contact moving plate head, lower link contact stator connects another utmost point of motor and forms loop.