JP3828913B2 - Three-wheeled bicycle - Google Patents

Description

  In the present invention, a vehicle body shell that defines a cabin for accommodating a rider is attached to a vehicle body frame that supports a front wheel, a rear wheel, and a saddle disposed therebetween, and entrances are provided on both left and right sides of the vehicle body shell. At the same time, the door for opening and closing the entrance / exit is attached to the body shell, and the cabin relates to an improvement of the three-wheeled bicycle that allows the rider to ground both feet when stopped.

Such a three-wheeled bicycle is already known as disclosed in Patent Document 1 below.
JP 2004-82745 A

  In this type of three-wheeled bicycle, if the width of the body shell is set wide, there is an advantage that the rider can open both feet to the left and right wide enough in the cabin to stabilize the vehicle body while stopping. The air resistance received by the shell increases and the burden on the rider increases. On the other hand, if the width of the body shell is set to be narrow, the air resistance during driving decreases. However, when the rider grounds both feet, the opening of both feet is interfered by the body shell or the door, which is sufficient. Inconvenience that cannot be done.

  The present invention has been made in view of such circumstances, and the width of the vehicle body shell is set to be small so as to minimize the air resistance during running. When the vehicle is stopped, the rider opens both feet wide enough to the left and right. An object of the present invention is to provide the three-wheeled bicycle that can be grounded.

In order to achieve the above object, according to the present invention, a vehicle body shell that defines a cabin for accommodating a rider is attached to a vehicle body frame that supports a front wheel, a rear wheel, and a saddle disposed between them. the left and right side portions provided with a door opening, attaching the door for opening and closing the entrance to the vehicle body shell, in the cabin, when the vehicle is stopped, the rider has to capable of grounding legs Miwa bicycle, the door, the lower It consists of a door frame that is pivotally supported by the vehicle body shell with an open U-shape and a synthetic resin door panel that is attached to the door frame, and a foot that the rider grounds at the bottom of the door panel A flexible portion that can be bent outwardly of the entrance / exit is provided, and a groove portion in the front / rear direction that facilitates outward bending of the flexible portion is provided on the outer surface of the vertical middle portion of the door panel. A first feature in that form.

In addition to the first feature, the present invention has a second feature that a return device is provided between the door frame and the flexible portion to spring-bias the flexible portion toward the door frame.

In addition to the first or second feature, the present invention further includes a saddle with a backrest disposed in front of the rear wheel and below the upper surface of the rear wheel, and a crankshaft with a pedal disposed in front of the saddle. This is the third feature.

According to the first feature of the present invention, when the vehicle is stopped, when both legs to be grounded by the rider are to be wider than the width of the vehicle body shell and the flexible part of the synthetic resin door is pressed from the inside with both legs, The flexible part bends outward and allows the spread of both legs. Therefore, even if the lateral width of the vehicle body shell is set to be small so as to minimize the air resistance during traveling, the rider can easily stabilize the vehicle body by spreading his / her feet beyond the lateral width of the vehicle body shell.

In addition, the synthetic resin door panel can ensure good flexibility of the flexible portion while sliding the outer surface thereof to reduce the air resistance as much as possible.

Further, according to the second feature of the present invention, since the flexible part can normally be reliably held in the contact position with the door frame by the return device, the vibration of the flexible part is suppressed during traveling. Generation of noise can be prevented.

Furthermore, according to the third feature of the present invention, the rider's riding posture can be effectively lowered, and accordingly the overall height of the vehicle body shell can be kept low, so that the lateral width of the vehicle body shell can be set small. In combination, the projected area in the front-rear direction of the vehicle body shell can be reduced, and the air resistance can be further reduced.

  Embodiments of the present invention will be described below on the basis of preferred embodiments of the present invention shown in the drawings.

  1 is a side view of a three-wheeled bicycle according to an embodiment of the present invention, FIG. 2 is a front view of the bicycle, FIG. 3 is a rear view of the bicycle, and FIG. 4 is a state with the body shell removed. 5 is a plan view showing the bicycle with the body shell removed, FIG. 6 is a sectional view taken along line 6-6 in FIG. 1, FIG. 7 is an enlarged sectional view taken along line 7-7 in FIG. FIG. 9 is an exploded perspective view of a door attached to the vehicle body shell, FIG. 10 is an enlarged sectional view taken along line 10-10 in FIG. 1, and FIG. 11 is taken along line 11-11 in FIG. FIG. 12 is an explanatory view of the operation corresponding to FIG. 10, FIG. 13 is a view corresponding to FIG. 10, showing a modification of the door lock device, and FIG. 14 is an enlarged sectional view taken along line 14-14 of FIG. 14 is a sectional view taken along line 15-15 in FIG. 14, FIG. 16 is a sectional view taken along line 16-16 in FIG. 1, and FIG. 17 is an enlarged view taken along line 17-17 in FIG. Sectional view, FIG. 18 line 18-18 enlarged sectional view of FIG. 1, FIG. 19 is a line 19-19 enlarged sectional view of FIG.

  4 and 5, the body frame F of the three-wheeled bicycle B includes a front head pipe 1, a main frame 2 that extends obliquely downward from the front head pipe 1 and horizontally extends rearward, A handle support pipe 3 projecting obliquely rearward from the head pipe 1 to the upper side of the main frame 2, a first stay 4 connecting the handle support pipe 3 and the main frame 2, and a rear end portion of the handle support pipe 3 A fixed rear head pipe 5, a second stay 6 that connects the first stay 4 and the main frame 2, a cross member 7 that is connected perpendicularly to the rear end of the main frame 2 and extends horizontally, It is composed of a U-shaped rear frame 9 that rises from the left and right sides of the cross member 7 and then extends horizontally rearward and closes at the rear end.

  In the front head pipe 1, a fork stem 11 a integrally projecting from the upper end of the front fork 11 that supports the front wheel 10 f is rotatably supported, and in the rear head pipe 5, a handle stem coupled to the steering handle 12. 12a is rotatably supported. The upper end portion of the fork stem 11a and the lower end portion of the handle stem 12a are connected via a parallel link mechanism 13 so that the rotation of the steering handle 12 can be transmitted in synchronization with the front fork 11. .

  Further, a pair of left and right rear wheels 10r, 10r are attached to the cross member 7 below the rear frame 9 via a suspension device with a damper (not shown) so as to move up and down.

  A saddle 15 with a backrest 15a is attached to the main frame 2 so as to occupy a position in front of the left and right rear wheels 10r, 10r and lower than their upper surfaces. In front of the saddle 15, a crankshaft 17 having a pair of left and right pedals 16 and 16 is rotatably supported by the main frame 2. A vehicle body shell S that covers the front wheel 10f, the rear wheels 10r and 10r, the saddle 15 and the like from above is attached to the vehicle body frame F. Its structure will be described later.

The crankshaft 17 and one of the left and right rear wheels 10r is connected via the transmission M. The transmission device M will be described with reference to FIG.

  The transmission M includes a first chain transmission 41, a second chain transmission 42, a multi-speed transmission 45 with a free wheel, a third chain transmission 43, a generator / motor 59, a clutch 46, and a rear side from the crankshaft 17 side. A drive axle 47 connected to the hub of the wheel 10r is sequentially connected.

  The first chain transmission device 41 is configured by winding a first chain 51 around a first drive sprocket 50 fixed to the crankshaft 17 and a first driven sprocket 50 ′ rotatably supported on the main frame 2. Is done. A pedal load sensor 58 that detects a load acting on the crankshaft 17, that is, a pedal load, is attached to the main frame 2 based on the degree of tension of the first chain 51.

  The second chain transmission device 42 is fixed to the second drive sprocket 52 fixed to the transmission shaft 59 adjacent to the first driven sprocket 50 ′ and the input shaft of the transmission 45 attached to the rear frame 9. The second chain 53 is wound around the two driven sprockets 52 '.

  The transmission 45 incorporates a free wheel that allows transmission in only one direction from the input shaft to the output shaft. Since the free wheel blocks the reverse load on the crankshaft 17, it can also be provided in the first chain transmission device 41 or the second chain transmission device 42.

  The third chain transmission device 43 includes a third driven sprocket 55 fixed to the output shaft of the transmission 45 and a third driven gear fixed to the drive shaft 48 connected to the rotor shaft of the generator / motor 59 attached to the rear frame 9. A third chain 56 is wound around the sprocket 55 '. The clutch 46 is interposed between the drive shaft 48 and the drive axle 47 on the output side of the third driven sprocket 55 ′. The clutch 46 is normally kept in an on state and connects the drive shaft 48 and the drive axle 47. A clutch lever 87 pivotally supported by the steering handle 12 or the vehicle body frame F in the vicinity thereof is connected to the release lever of the clutch 46 via a clutch wire 87a, and the clutch 46 is operated by operating the clutch lever 87. The drive shaft 48 and the drive axle 47 can be shut off in the off state.

  Similarly, the brake device of the three-wheeled bicycle B will be described with reference to FIG.

  The front wheel 10f is provided with a caliper type front brake 80 for braking the same, and the driven rear wheel 10r is provided with a drum type rear brake 81 for braking the same. A front brake lever 82 attached to the steering handle 12 adjacent to the right grip and a parking lever 83 attached to the front portion of the main frame 2 are provided on the operating portion of the front brake 80, and the front brake wire 84 and The parking wires 85 are connected to each other. Therefore, the front brake 80 can be operated by operating either the front brake lever 82 or the parking lever 83.

  The rear brake 81 is connected to a rear brake lever 86 attached to the steering handle 12 adjacent to the left grip via a rear brake wire 88. Therefore, the rear brake 81 can be operated by operating the rear brake lever 86.

  In FIG. 8, reference numeral 89 denotes a shift lever for switching the transmission 45.

  In FIG. 5, the rear frame 9 includes a battery 60 that supplies power to or from the generator / motor 59, and a control circuit unit 61 that controls energization between the generator / motor 59 and the battery 60. Is attached.

This three-wheeled bicycle B is used in the following modes.
[Electric assist driving]
First, when the rider R drives the crankshaft 17 by stroking the pedals 16 and 16 with the clutch lever 87 set to the on position and the clutch 46 turned on, the control circuit unit 61 is switched to the assist side, The driving force is transmitted to the rear wheel 10r through the first chain transmission device 41, the second chain transmission device 42, the transmission 45, the third chain transmission device 43, the clutch 46 and the driving axle 47 in order, and at the same time, the generator / motor 59 Is supplied from the battery 60 in accordance with the pedal load, and power corresponding to the pedal load is applied to the drive axle 47, so that an assist traveling state that reduces the burden on the rider R is achieved.
[Strengthening training]
When the clutch lever 87 is set to the on position and the clutch 46 is turned on in the same manner as described above and the control circuit unit 61 is switched to the charging side, the generator / motor 59 generates power when receiving a reverse load. Thus, the battery 60 can be charged. Accordingly, if the rider R drives the crankshaft 17 by scrambling the pedals 16 and 16, the driving force is generated by the first chain transmission device 41, the second chain transmission device 42, the transmission 45, the third chain transmission device 43, The power is transmitted to the rear wheel 10r through the clutch 46 and the drive axle 47 in sequence, and is driven. At the same time, the generator / motor 59 is in a power generation state by the rotation of the drive shaft 48 and charges the battery 60. Since the load generated by the power generation is added to the pedal load of the rider R, the rider R can perform physical fitness training while running the bicycle B and can simultaneously charge the battery 60. In this case, the amount of charge from the generator / motor 59 to the battery 60 can be controlled to increase / decrease by operating a pedal load adjustment dial (not shown), so that the strength of the pedal load can be adjusted freely. The pedal load can be freely adjusted according to the physical strength and fatigue level of the rider R, and training can be performed comfortably and comfortably.
[Strength training for stationary training]
First, while the front brake 80 into operation by operating the parking lever 83, the clutch 46 is turned off by operating the clutch lever 87 in the off position, also when the control circuit unit 61 Ru switched to the charge side, [ As in the case of physical fitness training, the generator / motor 59 can generate power and charge the battery 60 when it receives a reverse load. Therefore, if the rider R scoops the pedals 16 and 16 to drive the crankshaft 17, the driving force is applied to the first chain transmission device 41, the second chain transmission device 42, the transmission 45 and the third chain transmission device 43. Then, it is transmitted to the generator / motor 59, but is not transmitted to the drive axle 47 due to the clutch 46 being off. Therefore, since the reverse load is applied to the generator / motor 59 by driving the crankshaft 17 with the rear wheel 10r stopped, the generator / motor 59 enters the power generation state and charges the battery 60. Since the load generated by the power generation is added to the pedal load of the rider R, the rider R can perform physical fitness training and can charge the battery 60 at the same time. In this case as well, by operating a pedal load adjustment dial (not shown), the amount of charge from the generator / motor 59 to the battery 60 can be controlled to increase or decrease, and thereby the pedal load strength can be adjusted freely. In this case as well, the pedal load can be freely adjusted according to the physical strength and fatigue level of the rider R, so that the training can be performed comfortably and comfortably.

In this case, the bicycle B is a three-wheeled vehicle that is held in a stationary state by the operation of the parking lever 83, and that has one front wheel 10f and two rear wheels 10r, and can stand on its own without using a special stand device. Therefore, it can be safely used as a stationary training device for improving physical fitness, regardless of the installation location such as the garage or garden at home, and the kinetic energy of the rider R is converted into electric power charged in the battery. Therefore, there is no waste of energy. Moreover, the three-wheel bicycle B is from comprises a vehicle body shell S to accommodate the rider R, irrespective to whether the weather, it is possible to comfortably perform the travel and the tray-learning.

  If the clutch wire 87a and the parking wire 85 can be operated by one common operating lever, the front brake 80 is automatically activated during the stationary training to turn the clutch 46 off, Operation can be simplified.

  The vehicle body shell S will be described with reference to FIGS. A vehicle body shell S made of synthetic resin (for example, FRP, ABS) that covers the front wheels 10f, the rear wheels 10r, 10r, the saddle 15 and the like from above is attached to the vehicle body frame F, and the interior thereof is a cabin 30 that accommodates the rider R. It becomes. In the vehicle body shell S, a front fender 31 that covers the front wheel 10f and a rear fender 32 that covers the left and right rear wheels 10r and 10r and the rear frame 9 are attached to the vehicle body frame F (see FIGS. 4 and 6). A solar panel 49 that can charge the battery 60 is attached to the roof.

  The vehicle body shell S has a streamlined shape with an open bottom surface. A front window 35 and a rear window 36 into which a windshield 33 and a rear glass 34 are respectively fitted are provided at the front part and the rear part of the vehicle body shell S, and a wiper 37 for wiping the outer surface of the windshield 33 is provided on the windshield 33. Attach to the bottom. Further, headlights 38 and 38 and turn signal lamps 39 and 39 are mounted on the left and right of the front part of the vehicle body shell S, and turn signal lamps 40 and 40 are mounted on the left and right of the rear part, respectively.

As shown in FIGS. 5 to 7, in order to attach the vehicle body shell S to the vehicle body frame F, the front head pipe 1 is fixedly provided with a support rod 20 that protrudes outward from the left and right sides. 20 includes front connecting members 21 and 21 at both ends thereof. Further, rear connecting members 25 are provided at both left and right ends of the cross member 7. The front connecting members 21 and 21 are bolted to the front connecting members 22 and 22 fixed to the left and right inner walls of the front portion of the vehicle body shell S with the intermediate member 23 interposed therebetween, and the rear connecting members 25 and 25 are connected to the rear connecting members 25 and 25. The rear connecting members 26, 26 fixed to the left and right inner walls of the rear portion of the vehicle body shell S are coupled by the bolts 28 with the intermediate member 27 interposed therebetween, so that the vehicle body shell S is attached to the vehicle body frame F. If the intermediate members 23 and 27 are made of an elastic member, vibration between the vehicle body frame F and the vehicle body shell S can be absorbed.

  1, 9, and 10, both side walls of the vehicle body shell S are provided with notch-shaped entrances 63, 63 that are open on the lower side, and doors 64 that open and close the entrances 63, 63. , 64 are connected to the vehicle body shell S via a hinge 65, and a door lock device 66 capable of locking the closed state of the door 64 is provided between the rear end portion of each 64 and the vehicle body shell S. .

  As is clear from FIG. 9, each door 64 has an inverted U shape with the lower side open, and includes a door frame 67 having a cross member 67 a in the middle and an outer portion of the lower half of the door frame 67. The door panel 68 is joined to the side surface, and the front end portion of the door frame 67 is connected to the hinge 65.

  The door lock device 66 will be described with reference to FIGS. A base end portion of an unlock lever 72 is attached to a bracket 70 fixed to the door frame 67 inside the door panel 68 via a pair of upper and lower pivot shafts 71 and 71 coaxially arranged. The pivot shafts 71 and 71 can be rotated between a lock position L (see FIG. 10) and an unlock position U (see FIG. 12). A push button 73 penetrating the door panel 68 is provided at a middle portion of the unlock lever 72 via a pair of elastic rings 74 and 74 (for example, an O-ring and a rubber bush) disposed so as to sandwich the unlock lever 72. It is connected so that it can swing. The push button 73 is slidably fitted to a guide cylinder 76 fixed by a nut 75 with the door panel 68 and the bracket 70 interposed therebetween, and is locked by a repulsive force of a return spring 77 contracted on the guide cylinder 76. The release lever 72 is biased toward the lock position L.

  A permanent magnet 78 is bonded to the base end portion of the unlocking lever 72 on the inner surface opposite to the pivot shafts 71, 71. When the door 64 is closed, the permanent magnet 78 comes into contact with the surfaces and is attracted. A plate-like magnetic member 79 is bonded to the periphery of the entrance / exit 63 of the vehicle body shell S. The closed state of the door 64 is locked by the adsorption of the permanent magnet 78 and the magnetic member 79, and the natural opening of the door 64 can be prevented during traveling.

  At the edge of the door 64, a shooting section 90 is provided in the vicinity of the push button 73 when the door is opened and closed, and a recess 92 that allows insertion of a finger into the shooting section 90 is formed in the vehicle body shell S. Is done.

  Since the door lock device 66 is configured as described above, the rider R rotates the lock release lever 72 to the unlock position U in the cabin 30, or pushes the push button 73 outside the vehicle to unlock the lock release lever 72. When it is rotated to the position U, the permanent magnet 78 fixed to the lock release lever 72 is tilted with respect to the magnetic member 79, so that the two members 78 and 79 are easily separated from each other against their attracting force. That is, the locked state can be released, and the door 64 can be opened.

  When emergency exit to the outside of the vehicle is required, such as when the vehicle falls over, if the rider R applies an impact force to the door 64 from the inside, the door 64 is forced against the attracting force of the permanent magnet 78 and the magnetic member 79. Can be opened. Thus, since the door 64 can be forcibly opened without operating the lock release lever 72, emergency exit to the outside of the vehicle can be performed quickly.

  FIG. 13 shows a modification of the door lock device 66. In this modification, a plate-like magnetic member 79 is bonded to the lock release lever 72, the permanent magnet 78 and the magnetic yoke 91 that accommodates it are screwed to the vehicle body shell S, and the surfaces of the yoke 91 and the magnetic member 79 are fixed to each other. The closed state of the door 64 is held by the contact and suction. Since other configurations are the same as those of the previous embodiment, portions corresponding to those of the previous embodiment in FIG. 13 are denoted by the same reference numerals, and redundant description is omitted. Also in this modified example, the same effect as the previous embodiment can be exhibited.

1, 6, 9, and 14, the door panel 68 is made of synthetic resin, and a groove portion 93 extending in the front-rear direction is formed on the outer surface of the intermediate portion in the vertical direction. A flexure 68a is configured. The flexible portion 68 a is easily bent outward due to the elastic bending at the groove portion 93. The door panel 68 is fixed to the door frame 67 with a plurality of screws 94 at the upper part of the groove 93.

  At least the front portion of the flexible portion 68a close to the foot of the rider R is not fixed to the door frame 67, but is biased toward the contact position with the door frame 67 by the return device 95. The flexible portion 68 a is provided with an elastic member 96 that buffers the contact with the door frame 67.

  The return device 95 includes a reel case 97 fixed to the inner wall of the vehicle body shell S, a reel 98 that is rotatably supported in the reel case 97 and is spring-biased in the winding direction, and the flexible member. The cord 99 is connected to the front end portion of the portion 68 a and is wound around the reel 98, and the flexible portion 68 a is biased to a contact position with the door frame 67 by the winding force of the reel 98 with respect to the cord 99. It is supposed to be.

  As shown in FIG. 15, a cushion member 100 is attached to the inner surface of the flexible portion 68a along the lower edge to soften the contact with the shin of the foot of the rider R.

Since the left and right doors 64 and 64 are configured as described above, when stopping, the legs that the rider R contacts with the ground are trying to widen the legs wider than the lateral width of the vehicle body shell S, and the shins of both legs are flexed by the flexibility of the doors 64 and 64. When the flexible portion 68a is pressed outward against the cushion member 100 of the portion 68a, particularly the front end side of the flexible portion 68a bends outward while pulling the string 99 from the reel 98 (see FIGS. 6 and 6). 14), allow the spread of both feet. Therefore, even if the lateral width of the vehicle body shell S is set to be small so as to minimize the air resistance during traveling, the rider R can spread both feet beyond the lateral width of the vehicle body shell S to make the vehicle ground and easily stabilize the vehicle body. .

  In particular, the door panel 68 is made of synthetic resin, and a groove 93 in the front-rear direction that facilitates outward bending of the flexible portion 68a is formed on the outer surface of the middle portion of the door panel 68 in the vertical direction. It is possible to ensure good flexibility of the flexible portion 68a while smoothing the outer surface and reducing the air resistance as much as possible.

  When the rider R's widened legs are returned to the inside along with the start of the bicycle B or the like, the flexible portion 68a is brought into contact with the door frame 67 by its own restoring force and the winding force of the reel 98 on the string 99. Since it returns to the contact position and is held, it is possible to suppress the vibration of the flexible portion 68a and prevent the generation of noise during traveling.

  The saddle 15 with the backrest 15a is disposed between the front wheel 10f and the rear wheels 10r, 10r at a position lower than the upper surface of the rear wheels 10r, 10r, thereby effectively lowering the riding posture of the rider R. As a result, the overall height of the vehicle body shell S can be kept low. Therefore, when the lateral width of the vehicle body shell S is set to be small, the projected area in the front-rear direction of the vehicle body shell S can be reduced and the air resistance is reduced. Can be further reduced.

  9 and 16, a magnetic window frame 67b is joined to the upper half of the door frame 67 and the outer surface of the cross member 67a, and the lower end of the door glass 69 is connected to the cross member 67a via a hinge 102. The door glass 69 is connected to stand up to close the inside of the window frame 67b, and falls inside the door 64 to open the inside of the window frame 67b. A tape-shaped permanent magnet 103 is adhered to the periphery of the door glass 69. When the door glass 69 is stood and closed, the permanent magnet 103 is attracted to the window frame 67b, thereby closing the door glass 69. The state can be maintained. On the upper inner surface of the door glass 69, there is provided a knob 69a that takes a picture when the door glass 69 is opened and closed.

As shown in FIGS. 1 to 3, the front end portion and the rear end portion of the vehicle body shell S are provided with a front opening 105 and a rear opening 106 for exposing the front wheel 10f and the rear wheels 10r and 10r, respectively. The front opening 105 has a notch shape with the lower edge opened, and the rear opening 106 reaches the left and right entrances 63 and 63. The front opening 105 and the rear opening 106 are closed by a detachable front cover 107 and a rear cover 108.

  As shown in FIGS. 2 and 17, the front cover 107 is made of synthetic resin, and a plurality of pseudo-jewel-like connection protrusions 109 are formed on the inner surface along the periphery thereof. A plurality of rubber grommets 110 that can be elastically fitted to each other are attached to the vehicle body shell S. A seal member 111 that can be in close contact with the outer surface of the vehicle body shell S at the periphery of the front opening 105 is attached to the inner surface of the front cover 107.

  Thus, by elastically fitting the connecting protrusion 109 to the grommet 110, the front cover 107 is connected to the vehicle body shell S, and the front opening 105 can be easily closed. Removal is easy. In addition, the generation of vibration noise of the front cover 107 can be prevented by the elasticity of the grommet 110 and the seal member 111.

  3, 19 and 20, the rear cover 108 is also made of synthetic resin, and both left and right ends thereof are detachably fastened to the rear fender 32 by a plurality of screws 112, 112. A plurality of pseudo-jewel-like connecting projections 113 are formed on the inner surface of the upper edge of the rear cover 108, and a plurality of rubber grommets 114 that can be elastically fitted to the connecting projections 113 so as to be inserted and removed are provided in the rear opening. It is attached to the vehicle body frame F facing 106.

  Therefore, by elastically fitting the connecting projections 113 to these grommets 114, the rear cover 108 is connected to the vehicle body frame F, the rear opening 106 can be easily closed, and the rear cover 108 can be removed. Simple. Also in the rear cover 108, generation of vibration noise can be prevented by the elasticity of the grommet 114.

Thus, in the front cover 107 and the rear cover 108, the connecting projections 10 9 and 113 are pulled out from the corresponding grommets 110 and 114, and the screws 112 are loosened, so that the front cover 107 and the rear cover 108 are removed from the vehicle body. If it is removed from the shell S or the vehicle body frame F, the front opening 105 and the rear opening 106 can be opened and the front wheel 10f and the rear wheels 10r, 10r can be exposed, so that the puncture repair of the front wheel 10f and the rear wheels 10r, 10r is possible. The maintenance work around the front wheel 10f and the rear wheels 10r, 10r, such as the adjustment of the front brake 80 and the rear brake 81, can be easily performed without being obstructed by the vehicle body shell S, and the maintainability is improved. In addition, the front cover 107 and the rear cover 108 are located at the front end and the rear end of the vehicle body and are easily damaged by contact with other objects. Since repair can be performed by replacing only new parts, the repair work is easy and the repair cost can be kept low.

  The present invention is not limited to the above embodiment, and various design changes can be made without departing from the scope of the invention. For example, in the three-wheel electric assist bicycle B, the front wheel 10f can be two and the rear wheel 10r can be one.

The side view of the three-wheeled bicycle which concerns on the Example of this invention. Front view of the bicycle. The rear view of the bicycle. The side view which shows the bicycle in the state which removed the vehicle body shell. The top view which shows the same bicycle in the state which removed the vehicle body shell. FIG. 6 is a sectional view taken along line 6-6 in FIG. FIG. 7 is an enlarged sectional view taken along line 7-7 in FIG. The top view which shows the transmission device of the bicycle. The disassembled perspective view of the door attached to the said vehicle body shell. FIG. 10 is an enlarged sectional view taken along line 10-10 in FIG. FIG. 11 is a sectional view taken along line 11-11 in FIG. 10; Action explanatory drawing corresponding to FIG. FIG. 11 is a view corresponding to FIG. 10 showing a modified example of the door lock device. FIG. 14 is an enlarged sectional view taken along line 14-14 of FIG. FIG. 15 is a sectional view taken along line 15-15 in FIG. 14; FIG. 16 is a sectional view taken along line 16-16 in FIG. 1; FIG. 17 is an enlarged cross-sectional view taken along line 17-17 in FIG. 2; FIG. 18 is an enlarged sectional view taken along line 18-18 in FIG. FIG. 19 is an enlarged sectional view taken along line 19-19 in FIG. 3;

Explanation of symbols

B ... Three-wheeled bicycle F ... Body frame R ... Rider S ... Body shell 10f ... Front wheel 10r ... Rear wheel 15 ... Saddle 15a ... Backrest 16 ... Pedal 17 ... Crankshaft 30 ... Cabin 63 ... Entrance 64 ... Door 67 ... Door frame 68 ... Door panel 68a ... flexible part 93 ... groove part 95 ... return device

Claims (3)

A vehicle body shell defining a cabin (30) for accommodating a rider (R) on a vehicle body frame (F) supporting a front wheel (10f), a rear wheel (10r) and a saddle (15) disposed therebetween. S) is attached, and entrances (63) are provided on both left and right sides of the vehicle body shell (S), and a door (64) for opening and closing the entrance (63) is attached to the vehicle body shell (S), and the cabin (30 ) In a three-wheeled bicycle that allows the rider (R) to ground both feet when stopped,
The door (64) is formed in an inverted U shape with the lower side open and is pivotally supported by the vehicle body shell (S), and a synthetic resin attached to the door frame (67). The door panel (68) is provided with a flexible portion (68a) that can be bent outwardly from the entrance / exit (63) with a foot that the rider (R) grounds, at the bottom of the door panel (68). A three-wheeled bicycle , wherein a groove portion (93) in the front-rear direction that facilitates outward bending of the flexible portion (68a) is formed on the outer surface of the middle portion in the vertical direction of the door panel (68) . The three-wheeled bicycle according to claim 1,
A return device (95) is provided between the door frame (67) and the flexible portion (68a) to spring-bias the flexible portion (68a) in a contact direction with the door frame (67). A three-wheeled bicycle. In the three-wheeled bicycle according to claim 1 or 2,
A saddle (15) with a backrest (15a) is arranged in front of the rear wheel (10r) and below the upper surface of the rear wheel (10r), and a crankshaft (17) with a pedal (16) is placed in front of the saddle (15). ) Is a three-wheeled bicycle.

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