CN102979874B - Variable speed drive and the speed changing force-saving jack with above-mentioned variable speed drive - Google Patents
Variable speed drive and the speed changing force-saving jack with above-mentioned variable speed drive Download PDFInfo
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- CN102979874B CN102979874B CN201210557226.2A CN201210557226A CN102979874B CN 102979874 B CN102979874 B CN 102979874B CN 201210557226 A CN201210557226 A CN 201210557226A CN 102979874 B CN102979874 B CN 102979874B
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Abstract
The invention provides a kind of variable speed drive and the speed changing force-saving jack with above-mentioned variable speed drive, belong to mechanical engineering technical field.It solve existing shifting jack and there is the loaded down with trivial details problem of manipulation.This variable speed drive, comprises housing; Power input lever, Power output cover and power output gear is provided with in housing; One end of power input lever penetrates Power output cover, and the other end passes power output gear and passes housing; Power output gear is connected with Power output cover by under drive gear assembly; Power input lever is overlapped with Power output and is connected by mechanism for automatically switching between power output gear.This variable speed drive automatically can switch drive state according to Power output cover load condition, and meanwhile, counterrotating power input lever also automatically can switch drive state; There is the advantage of handiness thus.
Description
Technical field
The invention belongs to mechanical engineering technical field, relate to a kind of transmission device, particularly a kind of variable speed drive.
The present invention also belongs to mechanical engineering technical field, relates to a kind of jack, particularly a kind of speed changing force-saving jack with above-mentioned variable speed drive.
Background technique
Jack is that part is lifted as equipment, the light little crane gear of jacking weight in stroke by top bracket or bottom claw in one rigidity top.Rack-jack, screw jack and hydraulic jack three kinds can be divided into by structure characteristic.
About the pertinent literature of screw jack as Chinese patent literature discloses a kind of speed changing force-saving simple jack [application number 200710116269.6; Publication number CN101195466], comprise rhombus lifting frame, top headstock, base, screw mandrel, lifting frame left end is provided with nut, and right-hand member is provided with sleeve, and screw mandrel two ends are enclosed within nut and cover bucket respectively, and lifting frame right-hand member is also provided with force-saving speed-changer; Force-saving speed-changer comprises a pair intermeshing gear, is about to input rotating force and is applied on different gears, realize different speed, and reach labour-saving object.
And for example Chinese patent literature discloses a kind of chain shifting jack [application number 200920185698.3; Publication number CN201473263U], stiffening plate be positioned with driving gear, driven gear and coordinate the drive chain of transmission with driving gear, driven gear, driving gear is connected with screw rod.This jack is also be applied on different gears by input rotating force, realizes different speed, and reaches labour-saving object.
Described on end, crank, in order to realize gear, must switch back and forth, obviously increase maneuvering sequence by existing shifting jack between two gears, namely also exists and handles loaded down with trivial details problem.
Summary of the invention
The object of the invention is to there are the problems referred to above for existing technology, propose a kind of variable speed drive easy to use.
Another object of the present invention there are the problems referred to above for existing technology, proposes a kind of handiness and the laborsaving speed changing force-saving jack with variable speed drive.
Object of the present invention realizes by following technical proposal: a kind of variable speed drive, is characterized in that, comprises housing; Power input lever, Power output cover and power output gear is provided with in described housing; One end of described power input lever penetrates Power output cover, and the other end passes power output gear and passes housing; Described power output gear is connected with Power output cover by under drive gear assembly; Described power input lever and Power output overlap between power output gear by be greater than when power input lever input torque power input lever to overlap with Power output between load torque time power input lever can automatically switch to from being connected with Power output cover the mechanism for automatically switching be connected with power output gear and be connected.
The running principle of this variable speed drive is: housing is fixed, and Power output cover is connected with the parts (screw mandrel as jack) of destination device; In order to improve the stability that Power output cover runs, Power output cover is positioned in housing, as being connected by bearing between Power output cover and housing.Be connected with the outer end of power input lever by handwheel or the parts such as to shake the hand, and then rotational power input lever.When Power output be enclosed within the moment of torsion born in transmission process less time, as destination device is in no load condition; Power input lever directly drives Power output to overlap and rotates.When Power output be enclosed within the moment of torsion born in transmission process increase to power input lever and Power output overlap between can bear load torque time, as destination device is in load condition, power input lever moves axially, realize power input lever and Power output to overlap and depart from, be connected with power output gear, and then drive power output gear to rotate; By the transmission of under drive gear assembly, final realization drives Power output cover underdrive, reaches labour-saving object simultaneously.
In above-mentioned variable speed drive, described under drive gear assembly comprises and being positioned in inner walls and the internal tooth corresponding with power output gear position; Be provided with three planet wheels and a planet carrier in described housing, be connected by three above-mentioned planet wheels between described internal tooth and power output gear; Described planet wheel is positioned on planet carrier, and described planet carrier is fixedly connected with Power output cover.It is simple and compact that this structure has structure, is conducive to arranging arranging; There is the advantage that transmission performance is stable simultaneously.
In above-mentioned variable speed drive, described under drive gear assembly comprises the external tooth be positioned on Power output cover outer wall, described housing inner position has driving gear, one group of tooth of described driving gear is meshed with power output gear, and another group tooth is meshed with the external tooth that Power output overlaps.
In above-mentioned variable speed drive, described mechanism for automatically switching comprises the spacing flange collar be positioned in power input lever, one end mask of described spacing flange collar has circumferentially uniformly continous to be distributed with several helical teeth one, other end has circumferentially uniformly continous and is distributed with several helical teeth two, described Power output puts the helical teeth three having and be meshed with helical teeth one, power output gear end face has the helical teeth four be meshed with helical teeth two; Be provided with between power output gear and housing and maximum spacing between described helical teeth four and helical teeth two can be made to be less than the spring three of helical teeth one tooth depth.
In above-mentioned variable speed drive, described mechanism for automatically switching comprises the internal thread one be positioned on Power output cover inwall and the internal thread two be positioned on power output gear inwall; The outer wall of described power input lever is provided with the outside thread one that can be connected with internal thread one, spacing flange collar and the outside thread two that can be connected with internal thread two successively from an end to the other end; The constant load torque structure determining transmission load torque is provided with between described power input lever and Power output cover; Be provided with between power output gear and housing and maximum spacing between described outside thread two and internal thread two can be made to be less than the spring one of stroke between outside thread one and internal thread one.
When Power output be enclosed within the moment of torsion born in transmission process less time, power input lever cannot overcome the moment of torsion that constant load torque structure makes to determine between power input lever and Power output cover, namely power input lever directly drives Power output to overlap rotation, and now power input lever and power output gear are without drive connection.
When the load of Power output cover strengthens, until Power output be enclosed within the moment of torsion born in transmission process increase to constant load torque structure make power input lever and Power output cover between determine moment of torsion time, power input lever can occur relative to Power output cover circumference rotate; Power input lever moves axially under the effect of internal thread one and outside thread one thus, realizes power input lever and Power output cover loses drive connection; In the process, outside thread two meeting propulsion power output gear overcomes spring force and moves axially, after power input lever and Power output cover lose drive connection, outside thread two can coordinate with internal thread two, until spacing flange collar and power output gear end face lean, therefore power input lever drives power output gear transmission.
When the counterrotating of power input lever, power input lever naturally departs from power output gear and then is connected with Power output cover.
In above-mentioned variable speed drive, described constant load torque structure comprises the spheroid and spring two that are positioned at power input lever, one end and the power input lever of spring lean, and another section and spheroid lean, and described Power output cover inwall has the increasing corresponding with ball position and turns round hole.
In above-mentioned variable speed drive, described constant load torque structure is high static friction coefficient between internal thread one and outside thread one.
In above-mentioned variable speed drive, described internal thread one adopts iron to make, and outside thread one adopts rubber or graphite or plastic materials to make.
In above-mentioned variable speed drive, have and spacing flange collar pilot hole portion accordingly in described Power output cover.
In above-mentioned variable speed drive, in described Power output cover, there is the abutment facing leant for power output gear.
A kind of speed changing force-saving jack, comprise rhombus lifting frame, top headstock, base and screw mandrel, screw mandrel is arranged with nut and sleeve, nut is located on an end of rhombus lifting frame, and sleeve is located on the other end of rhombus lifting frame; It is characterized in that, this jack also comprises above-mentioned variable speed drive, and the housing in described variable speed drive is fixedly connected with sleeve or rhombus lifting frame; Described Power output cover is fixedly connected with screw mandrel.
Compared with prior art, this variable speed drive automatically can switch drive state according to Power output cover load condition, and meanwhile, counterrotating power input lever also automatically can switch drive state; There is the advantage of handiness thus.
The parts of this variable speed drive are all arranged in housing, therefore have beautiful shape, compact structure, are conducive to the lubrication operating mode improving drive connection, steady performance.
This speed changing force-saving jack can promote rapidly when not pushing up automobile, when top can lifting and have labour-saving advantage lentamente after automobile; Can rapidly automobile be declined when decline automobile and shrink rhombus lifting frame, the advantage of handiness thus.
Accompanying drawing explanation
Fig. 1 is the perspective view of this variable speed drive.
Fig. 2 is the perspective view at another visual angle of this variable speed drive.
Fig. 3 is the sectional structure schematic diagram of this variable speed drive.
Fig. 4 is the another kind of structural representation of the under drive gear assembly of this variable speed drive.
Fig. 5 is the structural representation of this speed changing force-saving jack.
Fig. 6 is the sectional structure schematic diagram of another technological scheme of this variable speed drive.
Fig. 7 is the cutting structure schematic diagram of this variable speed drive Power output cover.
In figure, A, variable speed drive; 1, housing; 2, power input lever; 2a, crank attachment hole; 2b, outside thread one; 2c, spacing flange collar; 2d, outside thread two; 3, Power output cover; 3a, internal thread one; 4, power output gear; 4a, internal thread two; 5, spring one; 6, abutment facing; 7, pilot hole portion; 8, spheroid; 9, spring two; 10, hole is turned round in increasing; 11, internal tooth; 12, planet wheel; 13, planet carrier; 14, rhombus lifting frame; 15, top headstock; 16, base; 17, screw mandrel; 18, sleeve; 19, plane bearing; 20, external tooth; 21, driving gear; 22, helical teeth one; 23, helical teeth two; 24, helical teeth three; 25, helical teeth four; 26, spring three.
Embodiment
Be below specific embodiments of the invention and by reference to the accompanying drawings, technological scheme of the present invention is further described, but the present invention be not limited to these embodiments.
As shown in Figure 1 to Figure 3, this variable speed drive comprises housing 1, power input lever 2, Power output cover 3, power output gear 4, under drive gear assembly and mechanism for automatically switching.
Specifically, housing 1 comprises the casing with cylindric inner chamber and the cover plate for capping inner chamber.Casing has the recessed shoulder in location, cover plate is arranged on recessed shoulder place, location, is provided with the jump ring be stuck on recessed shoulder side, location outside cover plate.
Power input lever 2, Power output cover 3 and power output gear 4 are all arranged in housing 1.In order to ensure that Power output cover 3 only circumference can rotate and improve the stability of rotating relative to housing 1, being connected by bearing between Power output cover 3 and housing 1, or being positioned by parts such as jump rings.
One end of power input lever 2 penetrates Power output cover 3, and the other end passes power output gear 4 and passes the cover plate of housing 1.The other end of power input lever 2 is also provided with crank attachment hole 2a.
Power input lever 2 and Power output are overlapped between 3 and power output gear 4 and are connected by mechanism for automatically switching.When between power input lever 2 input torque is greater than power input lever 2 and Power output overlaps 3 during load torque, mechanism for automatically switching can make power input lever 2 can be connected automatically to switch to and be connected with power output gear 4 from overlapping 3 with Power output.
Power output gear 4 overlaps 3 by under drive gear assembly and Power output and is connected.
More particularly, mechanism for automatically switching comprises internal thread two 4a being positioned at Power output and overlapping internal thread one 3a on 3 inwalls and be positioned on power output gear 4 inwall; One end outer wall of power input lever 2 is provided with outside thread one 2b, the spacing flange collar 2c that can be connected with internal thread one 3a and outside thread two 2d that can be connected with internal thread 4a successively from an end to the other end; The constant load torque structure determining transmission load torque is provided with between power input lever 2 and Power output cover 3; Be provided with between power output gear 4 and housing 1 and maximum spacing between outside thread two 2d and internal thread two 4a can be made to be less than the spring 1 of stroke between outside thread one 2b and internal thread one 3a.
In order to avoid power output gear 4 is excessive at the effect lower slider stroke of spring 1, in Power output cover 3, there is the abutment facing 6 leant for power output gear 4.When outside thread two 2d is not connected with internal thread two 4a, power output gear 4 power output gear 4 under the effect of spring 1 is resisted against on abutment facing 6.
Rotate and the stability of axial motion to improve power input lever 2, have and spacing flange collar 2c pilot hole portion 7 accordingly in Power output cover 3, namely spacing flange collar 2c outer wall relies on mutually with pilot hole portion 7 inwall, meanwhile, the cover plate of housing 1 has the resigning hole adapted with power input lever 2 size.
Constant load torque structure comprises spheroid 8 and spring 29; The sidewall of power input lever 2 has mounting hole, and spheroid 8 and spring 29 are located at mounting hole.The Single port of mounting hole is less, and spheroid 8 part can be made to pass but can prevent spheroid 8 from coming off, the another port of mounting hole is provided with nut.One end and the power input lever 2 of spring lean or lean with nut, and another section and spheroid 8 lean.Power output overlaps 3 inwalls and has the increasing corresponding with spheroid 8 position and turn round hole 10.Increasing the quantity turning round hole 10 is 1 ~ 4; The quantity that the present embodiment provides is 4, and overlaps 3 circumferences along Power output and be uniformly distributed.Spheroid 8 adopts steel or rubber to make, and the moment of torsion that obvious rubber can produce is larger.
According to actual conditions, constant load torque structure adopts following scheme to replace: constant load torque structure is high static friction coefficient between internal thread one 3a and outside thread one 2b.Internal thread one 3a adopts iron to make, and outside thread one 2b adopts rubber or graphite or plastic materials to make.
Under drive gear assembly comprises and is positioned at internal tooth 11 on housing 1 inwall and corresponding with power output gear 4 position; According to actual conditions, internal tooth 11 can process separately again with housing 1 drive fit.Be provided with three planet wheels 12 and a planet carrier 13 in housing 1, be connected by three above-mentioned planet wheels 12 between internal tooth 11 and power output gear 4; Planet wheel 12 is positioned on planet carrier 13, and planet carrier 13 and Power output overlap 3 and be fixedly connected with.
As shown in Figure 5, a kind of speed changing force-saving jack with above-mentioned variable speed drive A, comprise rhombus lifting frame 14, top headstock 15, base 16, screw mandrel 17 and above-mentioned variable speed drive A, screw mandrel 17 is arranged with nut and sleeve 18, nut is located on an end of rhombus lifting frame 14, and sleeve 18 is located on the other end of rhombus lifting frame 14; Housing 1 in variable speed drive A is fixedly connected with sleeve 18 or rhombus lifting frame 14; Power output cover 3 is fixedly connected with screw mandrel 17.Specifically, the housing 1 in variable speed drive A and sleeve 18 are by weld or bolt is fixedly connected with; Power output cover 3 is connected as a single entity or grafting with screw mandrel 17.In order to ensure the stability of transmission between Power output cover 3 and housing 1, between Power output cover 3 and housing 1, be also provided with plane bearing 19.
When utilizing the operation of this speed changing force-saving jack, as lift car; Be placed in by jack below vehicle body, now have larger spacing between top headstock 15 and vehicle body, namely this jack is in unloaded state; The utilization instrument shake power input lever 2 such as to shake the hand makes top headstock 15 move upward, now power input lever 2 has and outwards departs from movement tendency relative to housing 1, namely power input lever 2 is under the effect of constant load torque structure, and power input lever 2 drives Power output to overlap 3 constant speed drive.
When top headstock 15 and automotive body lean and bear certain active force, and when after power input lever 2 drive the Power output moment of torsion overlapped needed for 3 transmissions to exceed moment of torsion that constant load torque structure can bear, outside thread one 2b moves along internal thread one 3a, namely power input lever 2 circumference is rotated and moves axially, until outside thread one 2b departs from internal thread one 3a.In the process, outside thread two 2d can overcome spring force propulsion power output gear 4 and move axially, and the displacement distance of general power output gear 4 is 0.05 ~ 0.2 times of outside thread two 2d pitch; This structure makes outside thread two 2d more easily be connected with internal thread two 4a.Continue in rotation in power input lever 2, outside thread two 2d must be connected with internal thread two 4a; And then power input lever 2 continues axial motion until after spacing flange collar 2c and power output gear 4 lean, power input lever 2 drives power output gear 4 to rotate again, and then planet wheel 12, planet carrier 13, Power output cover 3 and screw mandrel 17 is driven to rotate successively; Realize top headstock 15 deceleration to rise, realize labour-saving object simultaneously.
When shake power input lever 2 rotates backward, power input lever 2 is axially inwardly moved until depart under the effect of outside thread two 2d and internal thread two 4a; In power input lever 2 continues to rotate, outside thread one 2b is connected with internal thread one 3a and until spacing flange collar 2c and Power output overlap 3 leans, while constant load torque structure regenerate effect; Power input lever 2 directly takes Power output cover 3 rotation to thus, namely realizes automobile and declines fast.
Embodiment two
As shown in Figure 4, the present embodiment with the structure of embodiment one and principle substantially identical, different place is: under drive gear assembly comprises and is positioned at Power output and overlaps external tooth 20 on 3 outer walls, described housing 1 inner position has driving gear 21, one group of tooth of driving gear 21 is meshed with power output gear 4, and another group tooth is meshed with the external tooth 20 that Power output overlaps 3.Power output gear 4 is also positioned on housing 1.
Embodiment three
The present embodiment with the structure of embodiment one and principle substantially identical, different place is: as indicated with 6, mechanism for automatically switching comprises spacing flange collar 2c, and spacing flange collar 2c is positioned at Power output cover 3, spacing flange collar 2c and is fixedly connected with power input lever 2 or is connected as a single entity.
One end mask of the spacing flange collar 2c of spacing flange collar 2c has circumferentially uniformly continous to be distributed with several helical teeth 1, and other end has circumferentially uniformly continous and is distributed with several helical teeth 2 23.
Power output cover 3 has annular recessed shoulder, and the bottom surface of the recessed shoulder of annular has the helical teeth 3 24 be meshed with helical teeth 1.Power output gear 4 end face has the helical teeth 4 25 be meshed with helical teeth 2 23; The spring 3 26 that maximum spacing between helical teeth 4 25 and helical teeth 2 23 can be made to be less than helical teeth 1 tooth depth is provided with between power output gear 4 and housing, namely when helical teeth 1 is meshed with helical teeth 3 24, between helical teeth 4 25 and helical teeth 2 23, spacing is maximum, and now between helical teeth 4 25 and helical teeth 2 23, spacing is still less than the tooth depth of helical teeth 1.
When supposing that power input lever 2 turns clockwise, when input torque is less than the moment of torsion that constant load torque structure determines, power input lever 2 drives Power output to overlap 3 synchronous rotaries by constant load torque structure.When input torque is greater than the moment of torsion that constant load torque structure determines, force helical teeth 1 rotation circumferential relative to helical teeth 3 24 and axial motion, namely between helical teeth 4 25 and helical teeth 2 23, spacing reduces, because maximum spacing between helical teeth 4 25 and helical teeth 2 23 is less than helical teeth 1 tooth depth, and after helical teeth 2 23 and helical teeth 4 25 lean, the elastic force that power output gear 4 can be forced to overcome spring 3 26 moves laterally, until after helical teeth 1 departs from helical teeth 3 24 completely, helical teeth 2 23 can be meshed with helical teeth 4 25; Now, power input lever 2 by helical teeth 2 23 can and helical teeth 4 25, under drive gear assembly drive again and export cover and be rotated in deceleration.
Otherwise, when power input lever 2 is rotated counterclockwise, helical teeth 2 23 rotation circumferential relative to helical teeth 4 25 and axial motion, namely helical teeth 2 23 departs from helical teeth 4 25 naturally; Between helical teeth 1 and helical teeth 3 24, spacing reduces, because maximum spacing between helical teeth 4 25 and helical teeth 2 23 is less than helical teeth 1 tooth depth, and after helical teeth 1 and helical teeth 3 24 lean, the elastic force that power output gear 4 can be forced to overcome spring 3 26 moves laterally, until after helical teeth 2 23 departs from helical teeth 4 25 completely, helical teeth 1 can be meshed with helical teeth 3 24; Now, power input lever 2 drives Power output to overlap 3 synchronous rotaries by constant load torque structure.
Specific embodiment described herein is only to the explanation for example of the present invention's spirit.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment, but can't depart from spirit of the present invention or surmount the scope that appended claims defines.
Claims (9)
1. a variable speed drive, is characterized in that, comprises housing (1), power input lever (2), Power output cover (3) and power output gear (4) is provided with in described housing (1), one end of described power input lever (2) penetrates Power output cover (3), and the other end passes power output gear (4) and passes housing (1), described power output gear (4) is connected with Power output cover (3) by under drive gear assembly, described power input lever (2) is connected by mechanism for automatically switching with between Power output cover (3) and power output gear (4), when power input lever (2) input torque is greater than load torque between power input lever (2) and Power output cover (3), power input lever (2) can be connected from being connected automatically to switch to Power output cover (3) with power output gear (4), described mechanism for automatically switching comprises the internal thread one (3a) be positioned on Power output cover (3) inwall and the internal thread two (4a) be positioned on power output gear (4) inwall, the outer wall of described power input lever (2) is provided with outside thread one (2b), spacing flange collar (2c) and the outside thread two (2d) that can be connected with internal thread two (4a) that can be connected with internal thread one (3a) successively from an end to the other end, the constant load torque structure determining transmission load torque is provided with between described power input lever (2) and Power output cover (3), be provided with between power output gear (4) and housing (1) and maximum spacing between described outside thread two (2d) and internal thread two (4a) can be made to be less than the spring one (5) of stroke between outside thread one (2b) and internal thread one (3a).
2. variable speed drive according to claim 1, is characterized in that, described under drive gear assembly comprises and is positioned at internal tooth (11) on housing (1) inwall and corresponding with power output gear (4) position; Be provided with three planet wheels (12) and a planet carrier (13) in described housing (1), be connected by three above-mentioned planet wheels (12) between described internal tooth (11) and power output gear (4); Described planet wheel (12) is positioned on planet carrier (13), and described planet carrier (13) is fixedly connected with Power output cover (3).
3. variable speed drive according to claim 1, it is characterized in that, described under drive gear assembly comprises the external tooth (20) be positioned on Power output cover (3) outer wall, described housing (1) inner position has driving gear (21), one group of tooth of described driving gear (21) is meshed with power output gear (4), and another group tooth is meshed with the external tooth (20) of Power output cover (3).
4. the variable speed drive according to claim 1 or 2 or 3, it is characterized in that, described constant load torque structure comprises the spheroid (8) and spring two (9) that are positioned at power input lever (2), one end and the power input lever (2) of spring lean, the other end and spheroid (8) lean, and described Power output cover (3) inwall has the increasing corresponding with spheroid (8) position and turns round hole (10).
5. the variable speed drive according to claim 1 or 2 or 3, is characterized in that, described constant load torque structure is high static friction coefficient between internal thread one (3a) and outside thread one (2b).
6. the variable speed drive according to claim 1 or 2 or 3, is characterized in that, have in described Power output cover (3) with spacing flange collar (2c) accordingly pilot hole portion (7).
7. the variable speed drive according to claim 1 or 2 or 3, is characterized in that, has the abutment facing (6) leant for power output gear (4) in described Power output cover (3).
8. a variable speed drive, is characterized in that, comprises housing (1), power input lever (2), Power output cover (3) and power output gear (4) is provided with in described housing (1), one end of described power input lever (2) penetrates Power output cover (3), and the other end passes power output gear (4) and passes housing (1), described power output gear (4) is connected with Power output cover (3) by under drive gear assembly, described power input lever (2) is connected by mechanism for automatically switching with between Power output cover (3) and power output gear (4), when power input lever (2) input torque is greater than load torque between power input lever (2) and Power output cover (3), power input lever (2) can be connected from being connected automatically to switch to Power output cover (3) with power output gear (4), described mechanism for automatically switching comprises the spacing flange collar (2c) be positioned in power input lever (2), one end mask of described spacing flange collar (2c) has circumferentially uniformly continous to be distributed with several helical teeth one (22), other end has circumferentially uniformly continous and is distributed with several helical teeth two (23), described Power output cover (3) has the helical teeth three (24) be meshed with helical teeth one (22), power output gear (4) end face has the helical teeth four (25) be meshed with helical teeth two (23), be provided with between power output gear (4) and housing and maximum spacing between described helical teeth four (25) and helical teeth two (23) can be made to be less than the spring three (26) of helical teeth one (22) tooth depth.
9. a speed changing force-saving jack, comprise rhombus lifting frame (14), top headstock (15), base (16) and screw mandrel (17), screw mandrel (17) is arranged with nut and sleeve (18), nut is located on an end of rhombus lifting frame (14), and sleeve (18) is located on the other end of rhombus lifting frame (14); It is characterized in that, this jack also comprises the variable speed drive (A) described in claim 1-8, and the housing (1) in described variable speed drive (A) is fixedly connected with sleeve (18) or rhombus lifting frame (14); Described Power output cover (3) is fixedly connected with screw mandrel (17).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210557226.2A CN102979874B (en) | 2012-12-20 | 2012-12-20 | Variable speed drive and the speed changing force-saving jack with above-mentioned variable speed drive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210557226.2A CN102979874B (en) | 2012-12-20 | 2012-12-20 | Variable speed drive and the speed changing force-saving jack with above-mentioned variable speed drive |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102979874A CN102979874A (en) | 2013-03-20 |
| CN102979874B true CN102979874B (en) | 2016-02-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210557226.2A Expired - Fee Related CN102979874B (en) | 2012-12-20 | 2012-12-20 | Variable speed drive and the speed changing force-saving jack with above-mentioned variable speed drive |
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| CN (1) | CN102979874B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2018194121A (en) * | 2017-05-19 | 2018-12-06 | トヨタ自動車株式会社 | Gear transmission |
| WO2018216354A1 (en) * | 2017-05-26 | 2018-11-29 | カネテック株式会社 | Jack |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5423518A (en) * | 1994-04-07 | 1995-06-13 | The Binkley Company | Landing gear for vehicle |
| CN2214405Y (en) * | 1994-12-15 | 1995-12-06 | 曾东方 | Jack |
| US5542647A (en) * | 1995-03-20 | 1996-08-06 | Huetsch; Larry C. | Two-speed jack |
| CN1257023A (en) * | 1999-12-30 | 2000-06-21 | 顾新虎 | Electric jack |
| CN2791007Y (en) * | 2005-03-31 | 2006-06-28 | 周亚东 | Electric screw-rod vertical jack |
| CN203009759U (en) * | 2012-12-20 | 2013-06-19 | 谢永喜 | Speed change transmission device and speed change labor-saving jack with same |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7325786B2 (en) * | 2003-02-18 | 2008-02-05 | Cequent Trailer Products, Inc. | Multi-speed drop leg mechanical jack for use with a trailer |
-
2012
- 2012-12-20 CN CN201210557226.2A patent/CN102979874B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5423518A (en) * | 1994-04-07 | 1995-06-13 | The Binkley Company | Landing gear for vehicle |
| CN2214405Y (en) * | 1994-12-15 | 1995-12-06 | 曾东方 | Jack |
| US5542647A (en) * | 1995-03-20 | 1996-08-06 | Huetsch; Larry C. | Two-speed jack |
| CN1257023A (en) * | 1999-12-30 | 2000-06-21 | 顾新虎 | Electric jack |
| CN2791007Y (en) * | 2005-03-31 | 2006-06-28 | 周亚东 | Electric screw-rod vertical jack |
| CN203009759U (en) * | 2012-12-20 | 2013-06-19 | 谢永喜 | Speed change transmission device and speed change labor-saving jack with same |
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| Publication number | Publication date |
|---|---|
| CN102979874A (en) | 2013-03-20 |
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