CN210063236U

CN210063236U - Motor tricycle with preposed steering handle

Info

Publication number: CN210063236U
Application number: CN201920540344.XU
Authority: CN
Inventors: 程利民; 陈天荣; 姚强
Original assignee: Chongqing Han Xue Cab Service Co Ltd
Current assignee: Chongqing Han Xue Cab Service Co Ltd
Priority date: 2019-04-19
Filing date: 2019-04-19
Publication date: 2020-02-14
Anticipated expiration: 2029-04-19

Abstract

A positive motor tricycle with a preposed direction handle comprises a frame, a front wheel steering column is supported in a head riser at the front end of the frame, a front wheel is suspended at the lower end of the front wheel steering column through a damping device, the upper end of the head riser at the front end of the frame is connected with a mounting connecting plate, a box body provided with a chain transmission mechanism is positioned above the head riser and is fixedly connected with the mounting connecting plate through a bolt, the front end of the box body extends forwards, a driving sprocket of the chain transmission mechanism is positioned at the front part of the box body and is fixed on a steering driving shaft supported on the box body through a bearing, the upper end of the steering driving shaft is circumferentially connected with a direction handle seat to form the preposed direction handle, a driven sprocket is positioned at the rear part of the box body and is connected with the driving sprocket through an adjustable chain, a abdicating hole is arranged at the rear part of the box body, the upper end of the front wheel steering column extends into the box, the length of the box body is smaller than the diameter of the front wheel of the motor tricycle.

Description

Motor tricycle with preposed steering handle

Technical Field

The utility model relates to a motor tricycle, in particular to a positive motor tricycle with a preposed direction handle.

Background

Generally, a head riser is welded on a main beam of a frame of a regular three-wheeled motorcycle for a front wheel steering column to pass through, a direction handle is directly installed at the upper end of the front wheel steering column, the head riser is rigidly connected with the frame main beam, vibration generated in the running process of the three-wheeled motorcycle and vibration of a front wheel and the frame due to road recoil can be transmitted to the direction handle through the head riser and the front wheel steering column, a driver can feel great vibration force on hands, the driver can control the running of the three-wheeled motorcycle by holding the direction handle with force, the driver can control the three-wheeled motorcycle laboriously, especially the driver can feel more laboriously when running on a rugged mountain road and a road with an uneven road, and the driver can feel numb due to long-time vibration, thereby traffic safety accidents are easily caused. In addition, the whole length of the positive motor tricycle is regulated by the nation, the limit value of the whole length of the positive motor tricycle is 3.5m according to the national standard, and the whole length of the positive motor tricycle cannot be lengthened. However, because the positive motor tricycle is a low-cost and practical transportation tool which is deeply loved by mountain areas and rural users, the length of the whole vehicle is limited, the space occupied by the driving section of the traditional positive motor tricycle is relatively large, and the length of the container is relatively short, so that the positive motor tricycle is difficult to bear relatively large-volume goods, the user is limited when carrying goods, once the goods exceed the container, the traffic rules can be violated, and a great deal of inconvenience is brought to the user.

Referring to fig. 9, patent No. 201310151897.3 discloses a technical scheme of a regular motor tricycle, which includes a frame of a main beam 1 and a container supporting beam 2, wherein a head riser 11 for mounting a steering column is welded at the front end of the main beam 1, a handle tube steering column for mounting a handle tube is rotatably matched in the head riser 11, the handle tube is mounted at the upper end of the handle tube steering column, the upper end and the lower end of the handle tube steering column both extend out of the head riser, a thrust bearing is arranged between the head riser and the handle tube steering column, the upper end of the handle tube steering column is locked by a nut, and the handle tube steering column is connected with the handle tube key. A front fork vertical pipe 12 for installing a front fork steering column is welded on a main beam 1 behind a head vertical pipe 11, the upper end of the head vertical pipe 11 is higher than the upper end of the front fork vertical pipe 12, the lower end of the front fork vertical pipe is lower than the lower end of the head vertical pipe so as to be convenient for installing a handle pipe and a linkage device, and the front fork vertical pipe 12 is parallel to the head vertical pipe 11 so as to be convenient for installing the linkage device. The handle tube steering column is connected with the front fork steering column through a linkage device. According to the motor tricycle, the front fork vertical pipe 12 is welded on the main beam behind the head vertical pipe 11, the handle pipe steering column is assembled in the head vertical pipe 11, and the front fork steering column is installed on the front fork vertical pipe 12; however, because the head stem and the front fork stem of the structure are welded and fixed on the frame main beam to form a rigid structure, the vibration generated in the running process of the motor tricycle and the vibration of a road surface recoil front wheel and the frame can still be transmitted to the steering handle through the front wheel steering column and the front fork stem and the head stem on the frame main beam, and the linkage device between the steering column of the handle tube and the front fork steering column can not overcome the strong vibration, so that the hands of a driver can still feel great vibration force, and the aim of saving driving force is difficult to achieve.

Disclosure of Invention

The utility model aims at providing a forward positive motor tricycle of direction hand (hold) to the not enough of prior art existence, it can make the driver's seat antedisplacement with the leading installation of direction hand (hold), with packing box extension forward, can reduce the reverse impact of the vibration of traveling to driver's hand again, makes driver control go and controls to turn to laborsavingly, improves the travelling comfort of driving.

The purpose of the utility model is realized like this:

a positive motor tricycle with a preposed direction handle comprises a frame of the positive motor tricycle, a front wheel steering column and a direction handle seat, wherein the front wheel steering column is supported in a head vertical pipe at the front end of the frame through a bearing, the lower end of the front wheel steering column is suspended with a front wheel through a damping device, the direction handle is installed on the direction handle seat, the upper end of the head vertical pipe is fixedly connected with an installation connecting plate, a plurality of installation holes are arranged on the installation connecting plate and are positioned around the head vertical pipe, a box body provided with a chain transmission mechanism is positioned above the head vertical pipe, the rear part of the box body is fixedly connected with the installation connecting plate through bolts corresponding to the installation holes, the front end of the box body extends forwards, a driving sprocket of the chain transmission mechanism in the box body is positioned at the front part of the box body and is fixed on a steering driving shaft supported on the box body through a bearing, and the upper end of the steering, the direction hand (hold) is leading to be formed, and chain drive's driven sprocket is located box intracavity rear portion and not contacts with the box, and drive sprocket and driven sprocket pass through adjustable chain and link to each other, and the rear portion of box is equipped with the hole of stepping down, the upper end of front wheel steering column stretches into box and driven sprocket circumference fixed connection from the hole of stepping down, and front wheel steering column and box contactless, it is parallel with the front wheel steering column to turn to the driving shaft, the axle center distance between drive sprocket and the driven sprocket is greater than or equal to the radius of motor tricycle front wheel, the length of box is less than the diameter of motor tricycle front wheel, and the driver's seat support on the frame is according to the equal antedisplacement setting of axle center distance between two sprockets, makes the packing box length at frame rear portion according to the axle center distance between two sprockets extension forward.

The transmission ratio of the driving chain wheel to the driven chain wheel is 1: 1.

An inclined support extending upwards is fixedly arranged on the front side of a vehicle head vertical pipe of the vehicle frame, a bearing plate for bearing the box body is fixed at the upper end of the inclined support, and the bearing plate is fixedly connected with the middle part of the box body through a bolt.

The box body comprises an upper shell and a lower shell, wherein an upper bearing seat is welded at the front part of the upper shell, a lower bearing seat is welded at the front part of the lower shell, the two bearing seats support and steer a driving shaft through bearings, a driving chain wheel is positioned between the two bearing seats, an upper abdicating hole is arranged at the rear part of the upper shell, a lower abdicating hole is arranged at the rear part of the lower shell, the upper end of a front wheel steering column penetrates through the upper abdicating hole and the lower abdicating hole, a driven chain wheel is positioned between the two abdicating holes and is fixedly connected with the front wheel steering column in the circumferential direction, an upwardly extending limiting column is arranged in a cavity of the lower shell, the limiting column is axially provided with a bolt through hole penetrating through the lower shell, the upper shell is provided with a fixing hole corresponding to the limiting column, and a bolt penetrates through; the rear portion of lower casing welding three erection bracing post, three erection bracing post all downwardly extending supports in the erection joint board of locomotive riser upper end, and three erection bracing post passes through the bolt to be connected fixedly with the erection joint board.

The three erection bracing post is triangle-shaped and arranges, and wherein, left erection bracing post, the right erection bracing post welding that is located two base angles of triangle-shaped are casing both sides under, left side erection bracing post, right erection bracing post lower extreme set up the screw hole, it is fixed with left erection bracing post, right erection bracing post with the erection joint board through bolt and screw hole cooperation, the middle section and the lower casing welding that are located the third erection bracing post at triangle-shaped apex angle, third erection bracing post still is equipped with the spacing portion of upwards extending, this spacing portion forms spacingly to last casing, third erection bracing post is equipped with the axial and runs through the axle center through-hole, this axle center through-hole supplies the bolt to pass with last casing, casing and erection joint board connection.

The adjustable chain comprises a front chain segment, a rear chain segment and two double-head adjusting bolts, wherein the chain plates at the two ends of the front chain segment and the rear chain segment are respectively hinged with nut sleeves through hinge pins, the screw thread directions of the nut sleeves of the front chain segment and the rear chain segment are opposite, the middle part of each double-head adjusting bolt is a screwing force stress part, the two ends of each double-head adjusting bolt are screw thread sections with opposite screw thread directions, the screw thread sections at the two ends of each double-head adjusting bolt are respectively in screw thread fit with a locking nut, the front chain segment is meshed with a driving chain wheel, the rear chain segment is meshed with a driven chain wheel, and the nut sleeves of the front chain segment and the rear chain segment are respectively in screw.

The driving chain wheel and the driven chain wheel are chain wheels with double rows of gear teeth, the upper row of gear teeth of the driving chain wheel and the driven chain wheel are connected through an adjustable chain, and the lower row of gear teeth of the driving chain wheel and the driven chain wheel are connected through another adjustable chain.

The driving chain wheel is welded and fixed or circumferentially fixed on the steering driving shaft, the driven chain wheel is welded and fixed or circumferentially fixed on a connecting sleeve, and the connecting sleeve is circumferentially and fixedly connected with the front wheel direction column through a spline or a key groove formed in the inner wall of the connecting sleeve.

And a maintenance window is arranged on the box body and used for adjusting and maintaining the adjustable chain.

Damping device includes two pairs of dampers, and two pairs of dampers are the symmetry and describe and are located the front wheel left and right sides, and every is including first damper, second damper to the damper, first damper, second damper are parallel, the fixed linking arm of lower extreme of first damper, and the extension end and the second damper lower extreme of this linking arm are articulated with the front wheel axle jointly, and the piston rod of four damper upper ends is spacing by the limiting plate, and passes the limiting plate and be connected fixedly with the fixed lower mounting panel that sets up of front wheel steering column, the limiting plate is located and is connected fixedly with the lower extreme of front wheel steering column below the mounting panel, and it has damping spring all to overlap on each damper, and damping spring's upper end is spacing in the limiting plate, and damping spring's lower extreme is spacing by the positioning disk that the attenuator urceolus set up.

By adopting the scheme, the upper end of the head vertical pipe at the front end of the frame is fixedly connected with a mounting connecting plate, the mounting connecting plate is provided with a plurality of mounting holes which are positioned around the head vertical pipe, a box body provided with a chain transmission mechanism is positioned above the head vertical pipe, the rear part of the box body is fixedly connected with the mounting connecting plate through bolts corresponding to the mounting holes, the front end of the box body extends forwards, a driving chain wheel of the chain transmission mechanism in the box body is positioned at the front part of the box body, the driving chain wheel is fixed on a steering driving shaft which is supported on the box body through a bearing, the upper end of the steering driving shaft extends upwards out of the box body and is fixedly connected with a steering handle seat in the circumferential direction to form a direction handle which is arranged in the front position, a driven chain wheel of the chain transmission mechanism is positioned at the rear part in a cavity of the box body and is not contacted with the box body, the driving chain wheel and, the front wheel steering column is not contacted with the box body, the steering driving shaft is parallel to the front wheel steering column, the axle center distance between the driving chain wheel and the driven chain wheel is larger than or equal to the radius of the front wheel of the motor tricycle, the length of the box body is smaller than the diameter of the front wheel of the motor tricycle, the driver seat support on the frame is arranged in a mode of shifting forwards according to the axle center distance between the two chain wheels, and the length of a container at the rear part of the frame is lengthened forwards according to the axle center distance between the two chain wheels. Therefore, the cargo box can be lengthened forwards under the condition that the total length of the whole motor tricycle is not increased, the cargo carrying adaptability of the cargo box is improved, and the problem of carrying cargos with relatively increased length is solved; the upper end of the front wheel steering column extends into the box body from the abdicating hole to be fixedly connected with the driven chain wheel in the circumferential direction, the front wheel steering column is not contacted with the box body, the front wheel steering column is not directly and rigidly connected with the box body, the front wheel steering column cannot directly transmit vibration to the box body, the driving chain wheel and the driven chain wheel are connected through an adjustable chain, the road surface recoil vibration transmitted by the front wheel steering column is eliminated when passing through the adjustable chain, the steering driving shaft is supported at the front part of the box body through a bearing, the vibration transmitted by the head vertical pipe is reduced when passing through the bearing, and the vibration force felt by the hands of a driver is greatly reduced; meanwhile, the steering torque is transmitted by adopting the adjustable chain, so that the steering of the direction handle is more labor-saving by adjusting the tightness of the chain, and the driving comfort is greatly improved.

The transmission ratio of the driving chain wheel to the driven chain wheel is 1:1, the driving chain wheel and the driven chain wheel can synchronously correspond to each other by adopting the transmission ratio of 1:1, the steering control of the steering handle on the steering column of the front wheel through the steering driving shaft is synchronous, and the steering operation of the front wheel of the motorcycle is labor-saving and accurate.

An inclined support extending upwards is fixedly arranged on the front side of a vehicle head vertical pipe of the vehicle frame, a bearing plate for bearing the box body is fixed at the upper end of the inclined support, and the bearing plate is fixedly connected with the middle part of the box body through a bolt. The middle part of the box body is supported by the inclined support, so that the box body can extend forwards more stably and firmly, and the deformation of the box body is prevented.

The box body comprises an upper shell and a lower shell, wherein an upper bearing seat is welded at the front part of the upper shell, a lower bearing seat is welded at the front part of the lower shell, the two bearing seats support and steer a driving shaft through bearings, a driving chain wheel is positioned between the two bearing seats, an upper abdicating hole is arranged at the rear part of the upper shell, a lower abdicating hole is arranged at the rear part of the lower shell, the upper end of a front wheel steering column penetrates through the upper abdicating hole and the lower abdicating hole, a driven chain wheel is positioned between the two abdicating holes and is fixedly connected with the front wheel steering column in the circumferential direction, an upwardly extending limiting column is arranged in a cavity of the lower shell, the limiting column is axially provided with a bolt through hole penetrating through the lower shell, the upper shell is provided with a fixing hole corresponding to the limiting column, and a bolt penetrates through; the rear portion of lower casing welding three erection bracing post, three erection bracing post all downwardly extending supports in the erection joint board of locomotive riser upper end, and three erection bracing post passes through the bolt to be connected fixedly with the erection joint board. By adopting the structure, the assembly of the box body is easy and firm, and meanwhile, the box body is fixedly connected with the mounting connecting plate of the head vertical pipe through the three mounting support columns, and the interference of the mounting of the front wheel steering column, the head vertical pipe and the driven chain wheel can not be caused.

The three mounting support columns are arranged in a triangular shape to form a stable support for the rear part of the box body.

The adjustable chain comprises a front chain segment, a rear chain segment and two double-head adjusting bolts, wherein the chain plates at the two ends of the front chain segment and the rear chain segment are respectively hinged with nut sleeves through hinge pins, the screw thread directions of the nut sleeves of the front chain segment and the rear chain segment are opposite, the middle part of each double-head adjusting bolt is a screwing force stress part, the two ends of each double-head adjusting bolt are screw thread sections with opposite screw thread directions, the screw thread sections at the two ends of each double-head adjusting bolt are respectively in screw thread fit with a locking nut, the front chain segment is meshed with a driving chain wheel, the rear chain segment is meshed with a driven chain wheel, and the nut sleeves of the front chain segment and the rear chain segment are respectively in screw. When the chain is assembled with the driving chain wheel and the driven chain wheel, the tightness of the chain is controlled by adjusting the two double-headed adjusting bolts, and particularly, the center of a front chain section and the center of a rear chain section can be formed by adjusting the two double-headed adjusting bolts, and the chain and the axes of the driving chain wheel and the driven chain wheel are assembled on a straight line. Therefore, the rotation angle synchronization of the driving chain wheel and the driven chain wheel is realized.

The driving chain wheel and the driven chain wheel are chain wheels with double rows of gear teeth, the upper row of gear teeth of the driving chain wheel and the driven chain wheel are connected through an adjustable chain, and the lower row of gear teeth of the driving chain wheel and the driven chain wheel are connected through another adjustable chain. The strength of the chain wheel can be enhanced by adopting the chain wheel with double gear teeth and two adjustable chains, the normal operation of steering operation can be ensured under the condition that one chain is loosened, and the stability of steering control is improved.

The driving chain wheel is welded and fixed or circumferentially fixed on the steering driving shaft, the driven chain wheel is welded and fixed or circumferentially fixed on a connecting sleeve, and the connecting sleeve is circumferentially and fixedly connected with the front wheel direction column through a spline or a key groove formed in the inner wall of the connecting sleeve. The driven chain wheel is welded and fixed or circumferentially fixed on a connecting sleeve, and the driven chain wheel is circumferentially and fixedly connected with the front wheel direction column through the connecting sleeve, so that the matching length of the driven chain wheel and the front wheel direction column is increased, and the circumferential fixing strength and stability of the driven chain wheel and the front wheel direction column are improved.

The box body is provided with a maintenance window which is used for adjusting and maintaining the adjustable chain, so that the adjustable chain is easy and convenient to maintain and adjust.

Damping device includes two pairs of dampers, and two pairs of dampers are the symmetry and describe and are located the front wheel left and right sides, and every is including first damper, second damper to the damper, first damper, second damper are parallel, the fixed linking arm of lower extreme of first damper, and the extension end and the second damper lower extreme of this linking arm are articulated with the front wheel axle jointly, and the piston rod of four damper upper ends is spacing by the limiting plate, and passes the limiting plate and be connected fixedly with the fixed lower mounting panel that sets up of front wheel steering column, the limiting plate is located and is connected fixedly with the lower extreme of front wheel steering column below the mounting panel, and it has damping spring all to overlap on each damper, and damping spring's upper end is spacing in the limiting plate, and damping spring's lower extreme is spacing by the positioning disk that the attenuator urceolus set up. The damping device of this kind of structure is adopted to the front wheel, more can improve the shock attenuation effect, can satisfy the shock-absorbing capacity under the heavy load condition behind the increase of packing box extension bearing capacity simultaneously, makes damping device's damping performance obtain further improvement.

The invention is further described with reference to the following drawings and specific examples.

Drawings

FIG. 1 is a schematic view of the entire vehicle structure of the present invention;

FIG. 2 is a schematic structural view of the front part of the motorcycle of the present invention;

FIG. 3 is a cross-sectional view of the case with the chain drive;

FIG. 4 is a schematic view of the chain drive within the housing;

FIG. 5 is a view showing the construction of a steering drive shaft to which a drive sprocket is attached;

FIG. 6 is a structural view of the driven sprocket and the connecting sleeve;

FIG. 7 is a view showing a structure of a segment;

FIG. 8 is a view of the connection of the stud adjustment bolt to the front and rear chain segments;

fig. 9 is a prior art frame structure view.

Detailed Description

Referring to fig. 1 to 8, an embodiment of a positive motor tricycle with a front-mounted steering handle comprises a frame of the positive motor tricycle, a front wheel steering column 29 and a steering handle seat 27, wherein the frame of the positive motor tricycle comprises a head riser 30, a front main beam 32, a front open crotch camber beam 33 and a rear beam 34 for supporting a cargo box, the head riser 30 is welded with the front end of the front main beam 32, the lower part of the front end of the front main beam 32 is welded with the open crotch part of the front open crotch camber beam 33, a reinforcing plate 47 is further welded at the connecting part of the head riser 30, the front main beam 32 and the front open crotch camber beam 33, and an engine is mounted in the space between the front main beam 32 and the front open crotch camber beam 33. The rear ends of the front main beam 32 and the front open crotch camber beam 33 are welded with a frame rear beam 34, and a rear wheel 36 is hung on a leaf spring 35 arranged on the frame rear beam 34. The front wheel steering column 29 is supported in a head tube 30 at the front end of the frame through a bearing, a front wheel 31 is suspended at the lower end of the front wheel steering column 29 through a damping device, the upper end of the front wheel steering column 29 penetrates through the head tube 30 to extend outwards, and the front wheel steering column 29 is matched with the head tube 30 through an upper bearing and a lower bearing. The handlebar holder 27 is provided with a handlebar 28. The upper end of the head riser 30 at the front end of the frame is fixedly connected with a mounting connecting plate 48, the mounting connecting plate 48 is provided with a hole for the head riser 30 to pass through, and the head riser 30 is positioned in the hole and welded with the mounting connecting plate 48. The mounting connection plate 48 is provided with a plurality of mounting holes located around the head riser 30, and in this embodiment, the mounting connection plate 48 is provided with three mounting holes for bolts to pass through, and the three mounting holes are distributed around the head riser 30 in a triangular shape. A box body 1 provided with a chain transmission mechanism is positioned above the vehicle head vertical pipe 30, the rear part of the box body 1 is fixedly connected with a mounting connecting plate 48 through bolts corresponding to mounting holes, and the front end of the box body 1 extends forwards. The drive sprocket 6 of the chain drive in the housing 1 is located in the front of the housing 1, which drive sprocket 6 is fixed to a steering drive shaft 5 that is mounted on bearings in the housing 1. The driving chain wheel 6 is fixed on the steering driving shaft 5 by welding or circumferentially fixed, the steering driving shaft 5 of the embodiment is provided with a shaft positioning flange 5a, and the driving chain wheel 6 is fixed on the steering driving shaft 5 by the shaft positioning flange 5a in a positioning welding way; of course, the driving sprocket 6 is axially positioned by the shaft positioning flange 5a, and is circumferentially fixed to the steering driving shaft 5 by a key or a spline to also achieve torque transmission. The upper end of the steering driving shaft 5 upwards extends out of the box body 1 and is fixedly connected with the steering handle seat 27 in the circumferential direction, the upper end of the steering driving shaft 5 of the embodiment is provided with a key groove 7, the steering driving shaft 5 is fixedly connected with the steering handle seat 27 in the circumferential direction through keys, or the steering driving shaft 5 is connected with the steering handle seat 27 through splines, then the upper end of the steering driving shaft 5 is screwed by nuts, and the steering handle seat 27 is tightly connected with the upper end of the steering driving shaft 5 to form a front steering handle 28. The driven chain wheel 10 of the chain transmission mechanism is positioned at the rear part in the cavity of the box body 1 and is not contacted with the box body 1, and the driving chain wheel 6 and the driven chain wheel 10 are connected through an adjustable chain. The rear portion of box 1 is equipped with the hole of stepping down, the upper end of front wheel steering column 29 stretches into box 1 and driven sprocket 10 circumference fixed connection from the hole of stepping down, and front wheel steering column 29 and box 1 contactless then screw up with the nut at front wheel steering column 29 upper end, with driven sprocket 10 fastening connection in front wheel steering column 29 upper end. The driven sprocket 10 can be directly connected with the front wheel steering column 29 in a circumferential fixed matching mode, or the driven sprocket 10 can be welded and fixed or fixed on a connecting sleeve 11 in a circumferential direction, and the connecting sleeve 11 is fixedly connected with the front wheel steering column 29 in the circumferential direction through a spline or a key groove arranged on the inner wall. The embodiment adopts the mode that the driven chain wheel 10 is fixedly connected with the front wheel direction column 29 in the circumferential direction through the connecting sleeve 11. The connecting sleeve 11 is provided with a positioning shaft shoulder 11a, and the driven sprocket 10 is fixed on the connecting sleeve 11 by the positioning shaft shoulder 11a in a positioning welding manner; or the driven chain wheel 10 is positioned by a positioning shaft shoulder and is circumferentially fixed on the connecting sleeve 11 through a key or a spline. The shaft hole 11b of the connecting sleeve 11 is a stepped hole, the orifice of the large-diameter end of the stepped hole is downward and is used for assembling and yielding the front wheel steering column 29, and the inner spline 11c arranged on the wall of the small-diameter end of the stepped hole is matched with the outer spline arranged on the front wheel steering column 29; or the small-diameter end hole wall of the stepped hole is provided with a key groove, the stepped hole is matched and fixed with the key groove arranged on the front wheel steering column 29 through a single key, and then the nut is screwed on the upper end of the front wheel steering column 29 to tightly press and fix the driven sprocket 10 and the connecting sleeve 11 on the upper end of the front wheel steering column 29. The steering main shaft 5 is parallel to the front wheel steering column 29. The adjustable chain comprises a front chain segment 12, a rear chain segment 13 and two double-head adjusting bolts 14, chain plates 17 at the end heads of the two ends of the front chain segment 12 and the rear chain segment 13 are respectively hinged with a nut sleeve 15 through a hinge pin 17a, the thread turning directions of the nut sleeves 15 of the front chain segment 12 and the rear chain segment 13 are opposite, the middle part of each double-head adjusting bolt 14 is a screwing force stress part 14a, the two ends of each double-head adjusting bolt are thread sections with opposite thread turning directions, the front chain segment 12 is meshed with a driving chain wheel 6, the rear chain segment 13 is meshed with a driven chain wheel 10, and the nut sleeves 15 of the front chain segment 12 and the rear chain segment 13 are respectively in thread fit with the thread sections at the two ends. And locking nuts 16 are respectively in threaded fit with the threaded sections at the two ends of the double-headed adjusting bolt 14 and are used for locking the adjusted length. The transmission ratio of the driving chain wheel 6 to the driven chain wheel 10 is 1:1, the driving chain wheel 6 and the driven chain wheel 10 can synchronously correspond to each other by adopting the transmission ratio of 1:1, the steering control of the steering handle 28 on the front wheel steering column 29 through the steering driving shaft 5 is synchronous, and the steering operation of the front wheel of the motorcycle is labor-saving. The box body 1 is provided with a maintenance window 26, and the maintenance window 26 is used for giving way to tools when the adjustable chain is adjusted and maintained. The axle center distance between the driving chain wheel 6 and the driven chain wheel 10 is larger than or equal to the radius of the front wheel 31 of the three-wheeled motorcycle, the length of the box body 1 is smaller than the diameter of the front wheel 31 of the three-wheeled motorcycle, the driver seat support 46 on the frame is arranged forwards in an equivalent way according to the axle center distance between the two chain wheels, a position is reserved for lengthening the cargo box 37, the length of the cargo box 37 at the rear part of the frame is lengthened forwards according to the axle center distance between the two chain wheels, therefore, the length of the cargo box 37 is lengthened under the condition that the total length of the whole motorcycle is not changed, and the volume of the. Damping device includes two pairs of dampers, and two pairs of dampers are the symmetry and describe and are located the front wheel 31 left and right sides, and every pair of dampers includes first damper 39, second damper 38, first damper 39, second damper 38 are parallel, and the fixed connecting arm 40 of lower extreme of first damper 39, the extension end of this connecting arm 40 and the 38 lower extreme of second damper are articulated with the front wheel axle jointly, and the piston rod of four damper upper ends is spacing by limiting plate 42, and passes limiting plate 42 and the fixed welded lower mounting panel 43 of front wheel steering column 29 respectively and be connected fixedly, limiting plate 42 is located and is connected fixedly below mounting panel 43 and the lower extreme of front wheel steering column 29 down, all overlaps on each damper and has damping spring 41, and damping spring 41's upper end is spacing in limiting plate 43, and damping spring 41's lower extreme is spacing by the positioning disk that the attenuator urceolus set up. The above-mentioned

Further, an inclined support 44 extending upwards is fixedly arranged on the front side of the head riser 30 of the frame, a support plate 45 for supporting the box body 1 is fixed at the upper end of the inclined support 44, and the support plate 45 is fixedly connected with the middle part of the box body 1 through a bolt. Therefore, the box body 1 extending forwards is supported, the stability of the box body extending forwards is ensured, and deformation is prevented.

Preferably, the box 1 includes casing 1a, casing 1b down, the anterior welding of casing 1a has bolster bearing housing 2, and the anterior welding of casing 1b has step bearing housing 3 down, and two bearing housings turn to driving shaft 5 through the bearing support, make driving sprocket 6 be located between two bearing housings, the rear portion of going up casing 1a is equipped with the hole of stepping down 8, and the rear portion of casing 1b is equipped with down the hole of stepping down 9 down, on step down hole 8, down step down hole 9 and be the through-hole for the front wheel steering column 29 passes and steps down. The upper end of the front wheel steering column 29 penetrates through the upper and lower abdicating holes, the driven sprocket 10 is positioned between the two abdicating through holes and is circumferentially and fixedly connected with the front wheel steering column 29 through the connecting sleeve 11, the cavity of the lower shell 1b is internally provided with an upwardly extending limiting column 21, the limiting column 21 is axially provided with a bolt through hole penetrating through the lower shell 1b, the upper shell 1a is provided with a fixing hole corresponding to the limiting column 21, and the upper shell 12, the lower shell 13 and a bearing plate 45 on the front side inclined support 44 of the head stand pipe 30 are fixedly connected through the bolt through hole and the fixing hole; the rear portion of the lower shell 1b is welded with three mounting support columns, the three mounting support columns all extend downwards to support a mounting connection plate 48 at the upper end of the vehicle head vertical pipe 30, and the three mounting support columns are fixedly connected with the mounting connection plate 48 through bolts. Three erection bracing post is triangle-shaped and arranges, wherein, the left erection bracing post 22, the right erection bracing post 23 welding that are located two base angles of triangle-shaped are casing 1b both sides down, left side erection bracing post 22, right erection bracing post 23 lower extreme set up the screw hole, it is fixed with erection joint board 48 and left erection bracing post 22, right erection bracing post 23 through bolt and screw hole cooperation, the middle section that is located the third erection bracing post 24 at triangle-shaped apex angle welds with casing 1b down, third erection bracing post 24 still is equipped with the spacing portion that upwards extends, this spacing portion forms spacingly to last casing 1a, third erection bracing post 24 is equipped with the axial and runs through the axle center through-hole, this axle center through-hole supplies the bolt to pass and connects upper casing 1a, casing 1b and erection joint board 48 down fixedly. The upper bearing seat 2 and the lower bearing seat 3 are both provided with oil seals 18, the upper bearing seat 2 of the upper shell 1a is covered by an upper dustproof sleeve 19, and the lower bearing seat 3 of the lower shell 1b is covered by a lower dustproof cover 20.

The utility model discloses positive motor tricycle is not only limited to above-mentioned embodiment, drive sprocket, driven sprocket also can adopt the sprocket of the double teeth of a cogwheel, the last row's of a cogwheel of drive sprocket, driven sprocket links to each other through an adjustable chain, the lower row's of a cogwheel of drive sprocket, driven sprocket links to each other through another adjustable chain. The chain transmission mechanism formed by the chain wheel with double gear teeth and the two adjustable chains can enhance the strength of the chain wheel, can ensure the normal operation of steering operation under the condition that one chain is loosened, and improves the stability of steering control.

The utility model discloses positive motor tricycle's structure makes positive motor tricycle under the state that does not change whole car length, through setting up the box, make the rear portion of box and the mounting plate fixed connection on the locomotive riser, by the anterior driving shaft and the direction of turning to of box seat circumference fixed connection and support direction hand (hold), driven sprocket and the front-wheel steering column circumference fixed connection at the rear portion of box, make positive motor tricycle direction hand (hold) leading from this, make the corresponding antedisplacement of driver's seat support simultaneously, give off the space for the packing box extension, make the packing box extend forward and increase length. The front wheel type three-wheeled motorcycle has the advantages that the requirement that the cargo box of the front wheel type three-wheeled motorcycle is lengthened within the limit value of the whole motorcycle length of the front wheel type three-wheeled motorcycle specified by national standards is met, the carrying capacity is improved, relatively long objects can be carried, the vibration of road surface recoil transmitted to the direction handle through the front wheel is reduced, the purpose of labor saving in steering is achieved, and the driving comfort is greatly improved.

Claims

1. The utility model provides a positive motor tricycle of leading direction hand (hold), includes the frame, front wheel steering column, the direction of positive motor tricycle seat of positive motor tricycle, the front wheel steering column passes through the bearing and supports in the locomotive riser of frame front end, front wheel steering column lower extreme passes through damping device and hangs the front wheel, install the direction hand (hold) on the direction hand (hold) seat, its characterized in that: the upper end of the headstock vertical pipe is fixedly connected with a mounting connecting plate, the mounting connecting plate is provided with a plurality of mounting holes which are positioned around the headstock vertical pipe, a box body provided with a chain transmission mechanism is positioned above the headstock vertical pipe, the rear part of the box body is fixedly connected with the mounting connecting plate through bolts corresponding to the mounting holes, the front end of the box body extends forwards, a driving chain wheel of the chain transmission mechanism in the box body is positioned at the front part of the box body, the driving chain wheel is fixed on a steering driving shaft which is supported on the box body through a bearing, the upper end of the steering driving shaft extends upwards to be fixedly connected with the circumferential direction of a steering handle seat to form a forward direction handle, a driven chain wheel of the chain transmission mechanism is positioned at the rear part in a box body cavity and is not contacted with the box body, the driving chain wheel and the driven chain wheel are connected through an adjustable chain, the rear part, the front wheel steering column is not contacted with the box body, the steering driving shaft is parallel to the front wheel steering column, the axle center distance between the driving chain wheel and the driven chain wheel is larger than or equal to the radius of the front wheel of the motor tricycle, the length of the box body is smaller than the diameter of the front wheel of the motor tricycle, the driver seat support on the frame is arranged in a mode of shifting forwards according to the axle center distance between the two chain wheels, and the length of a container at the rear part of the frame is lengthened forwards according to the axle center distance between the two chain wheels.

2. A positive motor tricycle with a forward handlebar as claimed in claim 1, characterised in that: the transmission ratio of the driving chain wheel to the driven chain wheel is 1: 1.

3. A positive motor tricycle with a forward handlebar as claimed in claim 1, characterised in that: an inclined support extending upwards is fixedly arranged on the front side of a vehicle head vertical pipe of the vehicle frame, a bearing plate for bearing the box body is fixed at the upper end of the inclined support, and the bearing plate is fixedly connected with the middle part of the box body through a bolt.

4. A positive motor tricycle with a forward handlebar as claimed in claim 1, characterised in that: the box body comprises an upper shell and a lower shell, wherein an upper bearing seat is welded at the front part of the upper shell, a lower bearing seat is welded at the front part of the lower shell, the two bearing seats support and steer a driving shaft through bearings, a driving chain wheel is positioned between the two bearing seats, an upper abdicating hole is arranged at the rear part of the upper shell, a lower abdicating hole is arranged at the rear part of the lower shell, the upper end of a front wheel steering column penetrates through the upper abdicating hole and the lower abdicating hole, a driven chain wheel is positioned between the two abdicating holes and is fixedly connected with the front wheel steering column in the circumferential direction, an upwardly extending limiting column is arranged in a cavity of the lower shell, the limiting column is axially provided with a bolt through hole penetrating through the lower shell, the upper shell is provided with a fixing hole corresponding to the limiting column, and a bolt penetrates through; the rear portion of lower casing welding three erection bracing post, three erection bracing post all downwardly extending supports in the erection joint board of locomotive riser upper end, and three erection bracing post passes through the bolt to be connected fixedly with the erection joint board.

5. A positive motor tricycle with forward steering handlebar as claimed in claim 4, wherein: the three erection bracing post is triangle-shaped and arranges, and wherein, left erection bracing post, the right erection bracing post welding that is located two base angles of triangle-shaped are casing both sides under, left side erection bracing post, right erection bracing post lower extreme set up the screw hole, it is fixed with left erection bracing post, right erection bracing post with the erection joint board through bolt and screw hole cooperation, the middle section and the lower casing welding that are located the third erection bracing post at triangle-shaped apex angle, third erection bracing post still is equipped with the spacing portion of upwards extending, this spacing portion forms spacingly to last casing, third erection bracing post is equipped with the axial and runs through the axle center through-hole, this axle center through-hole supplies the bolt to pass with last casing, casing and erection joint board connection.

6. A positive motor tricycle with a forward handlebar as claimed in claim 1, characterised in that: the adjustable chain comprises a front chain segment, a rear chain segment and two double-head adjusting bolts, wherein the chain plates at the two ends of the front chain segment and the rear chain segment are respectively hinged with nut sleeves through hinge pins, the screw thread directions of the nut sleeves of the front chain segment and the rear chain segment are opposite, the middle part of each double-head adjusting bolt is a screwing force stress part, the two ends of each double-head adjusting bolt are screw thread sections with opposite screw thread directions, the screw thread sections at the two ends of each double-head adjusting bolt are respectively in screw thread fit with a locking nut, the front chain segment is meshed with a driving chain wheel, the rear chain segment is meshed with a driven chain wheel, and the nut sleeves of the front chain segment and the rear chain segment are respectively in screw.

7. A positive motor tricycle with a forward handlebar as claimed in claim 1, characterised in that: the driving chain wheel and the driven chain wheel are chain wheels with double rows of gear teeth, the upper row of gear teeth of the driving chain wheel and the driven chain wheel are connected through an adjustable chain, and the lower row of gear teeth of the driving chain wheel and the driven chain wheel are connected through another adjustable chain.

8. A positive motor tricycle with a forward handlebar as claimed in claim 1, characterised in that: the driving chain wheel is welded and fixed or circumferentially fixed on the steering driving shaft, the driven chain wheel is welded and fixed or circumferentially fixed on a connecting sleeve, and the connecting sleeve is circumferentially and fixedly connected with the front wheel direction column through a spline or a key groove formed in the inner wall of the connecting sleeve.

9. A positive motor tricycle with a forward handlebar as claimed in claim 1, characterised in that: and a maintenance window is arranged on the box body and used for adjusting and maintaining the adjustable chain.

10. A positive motor tricycle with a forward handlebar as claimed in claim 1, characterised in that: damping device includes two pairs of dampers, and two pairs of dampers are the symmetry and describe and are located the front wheel left and right sides, and every is including first damper, second damper to the damper, first damper, second damper are parallel, the fixed linking arm of lower extreme of first damper, and the extension end and the second damper lower extreme of this linking arm are articulated with the front wheel axle jointly, and the piston rod of four damper upper ends is spacing by the limiting plate, and passes the limiting plate and be connected fixedly with the fixed lower mounting panel that sets up of front wheel steering column, the limiting plate is located and is connected fixedly with the lower extreme of front wheel steering column below the mounting panel, and it has damping spring all to overlap on each damper, and damping spring's upper end is spacing in the limiting plate, and damping spring's lower extreme is spacing by the positioning disk that the attenuator urceolus set up.