CN208102204U - Bicycle two front wheels system - Google Patents
Bicycle two front wheels system Download PDFInfo
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- CN208102204U CN208102204U CN201820272458.6U CN201820272458U CN208102204U CN 208102204 U CN208102204 U CN 208102204U CN 201820272458 U CN201820272458 U CN 201820272458U CN 208102204 U CN208102204 U CN 208102204U
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Abstract
The utility model is a kind of bicycle two front wheels system, the system connects steering shaft in torsion-bar spring seat upper surface, steering shaft is mounted in the bearing on bicycle body, the left and right end face of torsion-bar spring seat is separately connected left and right steering handle, and the left and right end face of torsion-bar spring seat and lower end surface connect support plate；Torsion-bar spring seat sets there are two torsion-bar spring axis hole, distinguishes one torsion-bar spring axis of each installation, two torsion-bar spring axis, one rocker arm of each self installation, two rocker arms respectively connect a front-wheel, so that bicycle on uneven road surface when driving, each front-wheel can beat alone, enable riding more stable, more comfortable, safer；Each rocker arm is fitted with a support rod, two support shafts, two spring bearings, and support plate is clipped among two spring bearings, limits rocker arm and generates along the forward and backward swing of direction progress perpendicular to the plane swung up and down.
Description
Technical field
The utility model relates to a kind of bicycle two front wheels systems that can be more stable, safer when driving on uneven road surface
System.
Background technique
It is well known that there are mainly two types of common Double-fronwheel cycles, the first is：Two front-wheels are coaxial, the disadvantage is that
On smooth-riding surface when driving, the jerk that the person of driving is subject to is big, and center of gravity both sides are swung greatly, and comfort is poor.It is for second：Before two
The wheel shaft of wheel can self-movement, the disadvantage is that, elastic buffer system structure is complicated, at high cost, elasticity is non-adjustable.
Summary of the invention
In order to not only improve the comfort of cyclist, but also make that two front wheels system structure is simple, manufacturing cost is low, it can be with
It is used as trolley；The utility model provides a kind of bicycle two front wheels system, which can make two front-wheels of bicycle
On uneven road surface when driving, it can respectively move up and down, be independent of each other, reduce impact and inclination that vehicle body is subject to, improve and cycle
Comfort lowers the center of gravity to improve stability of riding；It is automobile-used to can be used as hand push after separating with vehicle body.
Technical solution adopted by the utility model to solve its technical problems is bicycle two front wheels system is by torsion-bar spring
Seat, steering shaft, left and right steering handle, rack, support plate, two bearings, two torsion-bar spring axis, two nuts, two shake
Arm, two sets of bolts, nut, two front-wheels, two support rods, two support stem nuts, four support shafts, four support shaft spiral shells
Female, four spring bearings form；Two torsion-bar spring axis holes are set on torsion-bar spring seat, and the connection of torsion-bar spring seat turns to
Axis, support plate, left and right turn handle；Be fitted with bearing in each torsion-bar spring axis hole, torsion-bar spring axis be mounted on bearing and
In torsion-bar spring axis hole, and it is secured with nuts on torsion-bar spring seat；The splined hole being located in rocker arm turning end is mountable to be turned round
On the splined shaft of bar spring, rocker arm shaft turning end is fastened on the splined shaft of torsion-bar spring with bolt, nut, can also be passed through
Change the installation site of splined hole and splined shaft to adjust elastic force and bodywork height, is located at the location hole on rocker arm for installing branch
Strut connects a front axle on the swinging end of rocker arm；Steering shaft is equipped with bearing block；Bicycle two front wheels system passes through steering
Axis is mounted on the vehicle body of bicycle, and after installation, steering shaft and vehicle body form angle β, the 90 ° of angles angle β <；Support rod is equipped with
Two supporting shaft hole, support rod are mounted on rocker arm, are fixed with support stem nut；Two spring bearings are separately mounted to two branch
It supports on axis, two support shafts are separately mounted in two supporting shaft hole on support rod, two support shaft nuts are respectively by two
Support shaft is fastened on support rod；The size of two bearings is identical to replace mutually；The size of a nut is identical to replace mutually；
The size of a rocker arm is identical to replace mutually；The size of two front-wheels is identical to replace mutually；Two support rods cun completely
It is identical to replace mutually；The cun identical of four support shafts can replace mutually；The cun identical of four spring bearings can replace mutually.
The utility model has the advantages that can make two front-wheels of bicycle on uneven road surface when driving, can respectively up and down
Movement, is independent of each other, and the impact and inclination that reduction vehicle body is subject to improve and cycle comfort, lowers the center of gravity to improve and ride surely
It is qualitative；Elastic buffer intensity is adjustable, and bodywork height is adjustable, and structure is simple, and manufacturing cost is low, bicycle two front wheels system with
After the separating of bicycle, trolley can also be become.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 is the general structure schematic diagram of the Double-fronwheel cycle of the utility model.
Fig. 2 is that the torsion-bar spring seat of the utility model is cut along the first torsion-bar spring axis hole and the center line of first bearing
Diagrammatic cross-section and steering shaft and vehicle body relative positional relationship schematic diagram.
Fig. 3 is that the torsion-bar spring seat of the utility model is cut along the second torsion-bar spring axis hole and the center line of second bearing
Diagrammatic cross-section.
Fig. 4 is the structural schematic diagram of the first torsion-bar spring axis of the utility model.
Fig. 5 is the structural schematic diagram of the second torsion-bar spring axis of the utility model.
Fig. 6 is the structural schematic diagram of the front end face of the torsion-bar spring seat of the utility model.
Fig. 7 is the structural schematic diagram of the rear end face of the torsion-bar spring seat of the utility model.
Fig. 8 is the structural schematic diagram of first rocker arm of the utility model.
Fig. 9 is the structural schematic diagram of second rocker arm of the utility model.
Figure 10 is the schematic diagram of the section structure that the center line along the first torsion-bar spring axis hole of the utility model is cut.
Figure 11 is the schematic diagram of the section structure that the center line along the second torsion-bar spring axis hole of the utility model is cut.
Figure 12 is cutting along the center line of the first torsion-bar spring axis hole and the second torsion-bar spring axis hole for the utility model
Diagrammatic cross-section.
Figure 13 is the first rocker arm, first support bar, the second support shaft, first spring bearing, second of the utility model
Support axis, the second spring bearing, support plate, support plate flange relative positional relationship schematic diagram.
Figure 14 is the second rocker arm, second support bar, third support shaft, the third spring bearing, the 4th of the utility model
Support axis, the 4th spring bearing, support plate, support plate flange relative positional relationship schematic diagram.
Figure 15 is the torsion-bar spring seat of the utility model, and the relative position of steering shaft, left and right steering handle, support plate is closed
It is schematic diagram.
Figure 16 is the structural schematic diagram of first support shaft of the utility model.
In figure, 1. left and right steering handles, 2. vehicle bodies, 3. steering shafts, 7. torsion-bar spring seats, 8. first torsion-bar spring axis holes,
9. the second torsion-bar spring axis hole, 10. racks, 11. first nuts, 12. second nuts, the 13, first bolt, nut, 14.
Two bolts, nut, 31. bearing blocks, 32. support plates, 33. support plate flanges, 34. linkage sections, 35. first arc sections, 36. second
Arc section, 41. first front-wheels, 42. second front-wheels, 50. second support bar holes, 51. first rocker arms, 52. second rocker arms, 53.
One front axle, 54. second front axles, 55. first bolts hole, 56. second bolts hole, the 57, first splined hole, 58. second splines
Hole, 59, first support bar hole, 60. second shaft shoulders, 61. first torsion-bar spring axis, the 62, second torsion-bar spring axis, 63. first axles
Ring, 64. second collars, 65. first splined shafts, 66. second splined shafts, 67. first screw rods, 68. second screw rods, 69. first axles
Shoulder, 71. front end faces, 72. rear end faces, the 73, first torsion-bar spring hole, 74 second torsion-bar spring holes, 75. first axle bearing bore, 76.
Second bearing hole, 77. Sifangtai holes, 78. 6 fang platform holes, 81. first bearings, 82. second bearings, 83. first axle bearing bore, 84.
Second bearing hole, 93. first torsion-bar spring holes, 94. second torsion-bar spring holes, 95. Sifangtais, 96. 6 fang platforms, 511. first
Support rod, 512. first links, 513. third screw rods, 514. first support bar nuts, 515. first support shafts, 516. second
Support shaft, 517. first spring bearings, 518. second spring bearings, 521. second support bars, 522. second links, 523.
Four screw rods, 524. second support bar nuts, 525. third support shafts, 526. the 4th support shafts, 527. third spring bearings,
528. the 4th spring bearings, 531. flanges, 532. shaft shoulders, 533. shafts, 534. spindle nose screw rods, 535. first support shaft nuts,
541. first supporting shaft hole, 542. second supporting shaft hole, 543. third supporting shaft hole, 544. the 4th supporting shaft hole, 611. first
Torsion-bar spring, 622. second torsion-bar spring.
Specific embodiment
In Fig. 1, steering shaft (3) is equipped with bearing block (31), and steering shaft (3) is mounted in vehicle body (2), vehicle body (2) pressure
On bearing block (31), steering shaft (3) is connect with the upper surface of torsion-bar spring seat (7)；The left and right end face of torsion-bar spring seat (7)
It is connect with left and right steering handle (1), support plate connects (32) connection torsion-bar spring seat (7)；Is equipped on torsion-bar spring seat (7)
One torsion-bar spring axis (61) and the second torsion-bar spring axis (62)；The round end of first rocker arm (51) and the first torsion-bar spring axis (61)
Installation connection, the swinging end of the first rocker arm (51) and the wheel axis connection of the first front-wheel (41)；The round end of second rocker arm (52) with
The installation connection of second torsion-bar spring axis (62), the swinging end of the second rocker arm (52) and the wheel axis connection of the second front-wheel (42)；Hang object
Frame (10) is mounted on left and right turn handle (1), and rack (10) does not limit shape.
In Fig. 2, steering shaft (3) is mounted in the bearing of vehicle body (2), and steering shaft (3) and vehicle body (2) form angle β, folder
The 90 ° of angles angle beta <；(can be the axis of rolling can also along the first torsion-bar spring axis hole (8) and first bearing (81) for torsion-bar spring seat (7)
To be sliding bearing) the section that cuts of center line show, equipped with first bearing (81) in the first torsion-bar spring axis hole (8),
First torsion-bar spring axis (61) is mounted in the first torsion-bar spring axis hole (8) and first bearing (81), the first torsion-bar spring axis
(61) Sifangtai (95) body on assigns into Sifangtai hole (77), and the first nut (11) will be cubic by screwing with screw rod (67)
Platform (95) is fixed on inactive in Sifangtai hole (77)；The round end of first rocker arm (51) is fastened on by the first bolt (13)
On one splined shaft (65), the first front axle (53) of the swinging end connection the first front-wheel (41) of the first rocker arm (51)；Support plate
(32) it is connect with the front end face (71) of torsion-bar spring seat (7), and edge is flange (33).
In Fig. 3, torsion-bar spring seat (7) (can be the axis of rolling along the second torsion-bar spring axis hole (9) and second bearing (82)
Be also possible to sliding bearing) the section that cuts of center line show, equipped with second bearing in the second torsion-bar spring axis hole (9)
(82), the second torsion-bar spring axis (62) is mounted in the second torsion-bar spring axis hole (9) and second bearing (82), the second torsion-bar spring
Six fang platforms (96) body on axis (62) assigns into six fang platform holes (78), and the second nut (12) with the second screw rod (68) by revolving
Tightly six fang platforms (96) are fixed on inactive in six fang platform holes (78)；Second bolt (14) locks the round end of the second rocker arm (52)
It is fastened on the second splined shaft (66), the second front axle (54) of the swinging end connection the second front-wheel (42) of the second rocker arm (52).
In Fig. 4, the first torsion-bar spring axis (61) is equipped with the first screw rod (67), Sifangtai (95), the first torsion-bar spring
(611), first shaft shoulder (69), the first collar (63), the first splined shaft (65)；The bottom of Sifangtai (95) and the first torsion-bar spring
(611) it connecting, the top of Sifangtai (95) connect with the first screw rod (67), and the height of Sifangtai (95) is h1, and h1 < H1,
Sifangtai (95) a length of h3 of bottom sides, Sifangtai (95) a length of h4 of top sides, and H4 < h4 < H3 < h3.
In Fig. 5, the second torsion-bar spring axis (62) is equipped with the second screw rod (68), six fang platforms (96), the second torsion-bar spring
(622), second shaft shoulder (60), the second collar (64), the second splined shaft (666)；The bottom of six fang platforms (96) and the second torsion bar bullet
Spring (622) connection, the top of six fang platforms (96) connect with the second screw rod (68), and the height of six fang platforms (96) is h2, and h2 <
H2, a length of h5 of bottom sides of six fang platforms (96), a length of h6 of top sides of six fang platforms (96), and H6 < h6 < H5 < h5.
In Fig. 6, the front end face (71) of torsion-bar spring seat (7) is shown, the first torsion-bar spring axis hole (8) and the second torsion bar bullet
Spring axis hole (9) is symmetricly set on the two of (3) first torsion-bar spring axle construction schematic diagram of steering shaft and torsion-bar spring seat (7) central axes
It is other.
In Fig. 7, the rear end face (72) of torsion-bar spring seat (7) shows that Sifangtai hole (77) and six fang platform holes (78) are symmetrical
It is arranged in the both sides of steering shaft (3) and torsion-bar spring seat (7) central axes.
In fig. 8, the first splined hole (57) of open loop situations and the first bolt of two-part are set on the first rocker arm (51)
Hole (55), the swinging end of the first rocker arm (51) are connected to the first front axle (53) of the first front-wheel (41), are mounted on the first bolt
First rocker arm (51), can be fastened on the first splined shaft (65) by the first bolt, nut (13) in hole (55)；First rocker arm
(51) it is additionally provided with first support bar hole (59) on, can be used for installing first support bar (511).
In Fig. 9, the second splined hole (58) of open loop situations and the second bolt of two-part are set on the second rocker arm (52)
Hole (56), the swinging end of the second rocker arm (52) are connected to the second front axle (54) of the second front-wheel (42), are mounted on the second bolt
Second rocker arm (52), can be fastened on the second splined shaft (66) by the second bolt, nut (14) in hole (56)；Second rocker arm
(52) it is additionally provided with second support bar hole (50) on, can be used for installing second support bar (521).
In Figure 10, the section cut along the center line of the first torsion-bar spring axis hole (8) is shown, the first torsion-bar spring axis hole
(8) it is made of first axle bearing bore (83), the first torsion-bar spring hole (93), Sifangtai hole (77)；Sifangtai hole (77) bottom
Connect the first torsion-bar spring axis hole (8), the length of Sifangtai hole (77) is H1, and h1 < H1, Sifangtai hole (77) bottom side length
For H3, Sifangtai hole (77) top side length is H4, and H4 < h4 < H3 < h3.
In Figure 11, the section cut along the center line of the second torsion-bar spring axis hole (9) is shown, the second torsion-bar spring axis hole
(9) it is made of second bearing hole (84), the second torsion-bar spring hole (94), six fang platform holes (78)；Six fang platform hole (78) bottoms
The second torsion-bar spring hole (94) is connected, the length in six fang platform holes (78) is H2, and h2 < H2, six fang platform hole (78) bottom sides are a length of
H5, six fang platform hole (78) a length of H6 of top sides, and H6 < h6 < H5 < h5.
In Figure 12, along the section of the center line of the first torsion-bar spring axis hole (8) and the second torsion-bar spring axis hole (9) incision
It has been shown that, the first torsion-bar spring axis hole (8) and the second torsion-bar spring axis hole (9) they are h7 in the central point distance of front end face (71), the
One torsion-bar spring axis hole (8) and the second torsion-bar spring axis hole (9) are H7 in the central point distance of rear end face (72), and h7≤H7.
In Figure 13, first support bar (511) is equipped with the first link (512), third screw rod (513), the first support shaft
Hole (541), the second supporting shaft hole (542)；First support bar (511) is mounted in first support bar hole (59), is supported with first
Stem nut (514) is fixed；First spring bearing (517) is mounted on the first support shaft (515), the first support shaft (515) installation
It is fixed with the first support shaft nut (535) in the first supporting shaft hole (541) on first support bar (511)；Second support shaft
It holds (518) to be mounted on the second support shaft (516), the second support shaft (516) is mounted on second on first support bar (511)
In supporting shaft hole (542), fixed with the second support shaft nut；The first arc section (35) of support plate (32) is sandwiched in the first support
Between bearing (517) and the second spring bearing (518).
In Figure 14, second support bar (521) is equipped with the second link (522), the 4th screw rod (523), third support shaft
Hole (543), the 4th supporting shaft hole (544)；Second support bar (521) is mounted in second support bar hole (50), is supported with second
Stem nut (524) is fixed；Third spring bearing (527) is mounted on third support shaft (525), third support shaft (525) installation
In the third supporting shaft hole (543) on second support bar (521), fixed with third support shaft nut；4th spring bearing
(528) it is mounted in the 4th support shaft (526), the 4th support shaft (526) is mounted on the 4th support on second support bar (521)
In axis hole (544), fixed with the 4th support shaft nut；The second arc section (36) of support plate (32) is sandwiched in third spring bearing
(527) between the 4th spring bearing (528).
In Figure 15, the upper surface of torsion-bar spring seat (7) connects steering shaft (3)；Left and right end face is separately connected left and right turn
To handle (1)；Left and right end face and lower end surface connection support plate (32).Support plate (32) is by the first arc section (35), linkage section
(34), the second arc section (36) forms；The each point of arc-shaped edges on the same plane of first arc section (35) is to the first torsion bar
The distance of the center line of spring eye (8) is all identical；The each point of arc-shaped edges on the same plane of second arc section (36) arrives
The distance of the center line in the second torsion-bar spring hole (9) is all identical.
In Figure 16, flange (531), the shaft shoulder (532), shaft (533), spindle nose spiral shell are equipped on the first support shaft (515)
Bar (534)；The shaft shoulder can be used for installing bearing (517), and shaft (533) can be used for assigning into the first supporting shaft hole (541), and first
Support shaft nut (535) can be used for fastening the first support shaft into first supporting shaft hole of (515) on first support bar (511)
(541) in.The size of first support shaft (515) and the second support shaft (516) as described herein, third support shaft (525), the 4th
The size of support shaft (526) is identical, can replace mutually；The size of first support shaft nut (535) with it is as described herein
Second support shaft nut, third support shaft nut, the size of the 4th support shaft nut are identical, can replace mutually.
1. the size of the first rocker arm (51) is identical with the size of the second rocker arm (52), can replace mutually；First front-wheel
(41) size is identical with the size of the second front-wheel (42), can replace mutually；When the first front-wheel (41) is that direct current generator drives
When driving wheel and the second front-wheel (42) are direct current generator driving wheels, the first front-wheel (41) and the second front-wheel (42) can also be replaced mutually
It changes；The size of first nut (11) is identical with the size of the second nut (12), can replace mutually；First support bar (511)
Size it is identical with the size of second support bar (521), can replace mutually；The size of first support shaft (515), second
Size, the size of third support shaft (525), the size of the 4th support shaft (526) of support shaft (516) be all it is identical, can be with
Replacement mutually；The size of first support shaft nut (535), the size of the second support shaft nut, the size of third support shaft nut,
The size of 4th support shaft nut be all it is identical, can replace mutually；The size of first spring bearing (517), the second support
The size of (527), the size of the 4th spring bearing (528) are all identical after the size of bearing (518), third spring bearing,
It can replace mutually.
2. left and right steering handle (1) to be connected to the left and right end face of the torsion-bar spring seat (7) of the lower section of vehicle body (2)
On to limit the rotation angle of steering shaft (3), in order to avoid various connecting pipelines are impaired；On uneven road surface when driving, the first front-wheel
(41) it respectively can individually beat with the second front-wheel (42).
3. rack (10) does not limit shape, rack (10) is mounted on left and right steering handle (1)；By steering shaft
(3) after separating from vehicle body (2), bicycle two front wheels system is exactly a two-wheel Manual hand-push vehicle；When the first front-wheel
(41) when be direct current generator driving wheel and the second front-wheel (42) is direct current generator driving wheel, by steering shaft (3) from vehicle body (2)
After separating, bicycle two front wheels system is exactly two-wheel manpower, an Electric hand cart.
4. the first rocker arm (51) compression is when swinging up and down, at the same drive first support bar (511), the first support shaft (515),
Second support shaft (516), the first spring bearing (517), the second spring bearing (518) are swung above and below, are being swung above and below
In the process, the first arc section (35) of support plate (32) is clipped in by the first spring bearing (517) and the second spring bearing (518)
Wherein, and the first spring bearing (517) and the second spring bearing (518) are respectively in the first arc section (35) of support plate (32)
Front and reverse side on roll, both limited the first rocker arm (51) and put along the direction vertical with the plane swung above and below
It is dynamic, while also reducing the interference swung above and below to the first rocker arm (51) to the greatest extent.
5. the second rocker arm (52) compression is when swinging up and down, at the same drive second support bar (521), third support shaft (525),
4th support shaft (526), third spring bearing (527), the 4th spring bearing (528) are swung above and below, are being swung above and below
In the process, the second arc section (36) of support plate (32) is clipped in by third spring bearing (527) and the 4th spring bearing (528)
Wherein, and third spring bearing (527) and the 4th spring bearing (528) are respectively in the second arc section (36) of support plate (32)
Front and reverse side on roll, both limited the second rocker arm (52) and put along the direction vertical with the plane swung above and below
It is dynamic, while also reducing the interference swung above and below to the second rocker arm (52) to the greatest extent.
Claims (1)
1. a kind of bicycle two front wheels system, the system is by torsion-bar spring seat, steering shaft, left and right steering handle, rack, branch
Support plate, two bearings, two torsion-bar spring axis, two nuts, two rocker arms, two sets of bolts, nut, two front-wheels, two branch
Strut, two support stem nuts, four support shafts, four support shaft nuts, four spring bearings form；It is characterized in that：?
First torsion-bar spring axis hole and the second torsion-bar spring axis hole are set on torsion-bar spring seat, connects and turns in torsion-bar spring seat upper surface
Axis is connected to left and right steering handle on torsion-bar spring seat；The left and right end face of torsion-bar spring seat and lower end surface connect support plate；The
First bearing is installed, the first torsion-bar spring axis is mounted on first bearing and the first torsion-bar spring axis hole in one torsion-bar spring axis hole
In and be fastened on torsion-bar spring seat；The first splined hole in the turning end of first rocker arm is securedly mounted to the first torsion-bar spring
The first splined shaft on, the swinging end of the first rocker arm connects the first front-wheel, and first support bar is mounted on the first rocker arm, first
Support bearing is mounted in the first support shaft, and the first support shaft is mounted in first support bar, and the second spring bearing is mounted on second
In support shaft, the second support shaft is mounted in first support bar, and support plate is sandwiched in the first spring bearing and the second spring bearing
Between；Second bearing is installed, the second torsion-bar spring axis is mounted on second bearing and the second torsion bar in the second torsion-bar spring axis hole
In spring axis hole and it is fastened on torsion-bar spring seat；The second splined hole in the turning end of second rocker arm is securedly mounted to second
On second splined shaft of torsion-bar spring, the swinging end of the second rocker arm connects the second front-wheel, and second support bar is mounted on the second rocker arm
On, third spring bearing is mounted in third support shaft, and third support shaft is mounted in second support bar, the 4th spring bearing peace
In the 4th support shaft, the 4th support shaft is mounted on the 4th support rod, and support plate is sandwiched in third spring bearing and the 4th
Between spring bearing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820272458.6U CN208102204U (en) | 2018-02-22 | 2018-02-22 | Bicycle two front wheels system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820272458.6U CN208102204U (en) | 2018-02-22 | 2018-02-22 | Bicycle two front wheels system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208102204U true CN208102204U (en) | 2018-11-16 |
Family
ID=64125337
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820272458.6U Active CN208102204U (en) | 2018-02-22 | 2018-02-22 | Bicycle two front wheels system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208102204U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110182288A (en) * | 2018-02-22 | 2019-08-30 | 莫馥蓉 | Bicycle two front wheels system |
-
2018
- 2018-02-22 CN CN201820272458.6U patent/CN208102204U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110182288A (en) * | 2018-02-22 | 2019-08-30 | 莫馥蓉 | Bicycle two front wheels system |
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