JP2010163145A - Tricycle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tricycle for improving stability during traveling and getting on and off. <P>SOLUTION: Inside front wheel support parts 162L and 162R are respectively rotatably arranged in side posts 15L and 15R by projecting inside wheel shaft support parts 169L and 169R from the lower end of the side posts 15L and 15R. An upper part of the inside front wheel support parts 162L and 162R and outside front wheel support parts 161L and 161R are connected by connecting members 163L and 163R. Two front wheels 11L and 11R are respectively arranged between the side posts 15L and 15R and the outside front wheel support parts 161L and 161R. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a three-wheeled bicycle having two front wheels and a rear wheel which is one drive wheel.

  Conventionally, as a three-wheeled bicycle having two front wheels and one rear wheel, there is one provided with a mechanism for tilting two front wheels to the left and right as shown in Patent Document 1 in order to facilitate traveling on an inclined surface. .

  This three-wheeled bicycle has a handle post that supports the handle, left and right side posts that are respectively disposed on the left and right sides of the handle post, and left and right front forks that are rotatably supported on the left and right side posts, respectively. Have. The two front wheels are rotatably supported by the left and right front forks, respectively.

Further, this three-wheeled bicycle has a pair of rotatable upper links and lower links, both ends of which are connected to the left and right side posts, and the center portion of which is connected to the handle posts. The upper link and the lower link have the same shape and the same length.
The left and right side posts and the pair of upper links and lower links constitute a link mechanism for tilting the two front wheels to the left and right.
In traveling on an inclined surface, the upper link and the lower link rotate according to the right and left inclination of the handle post, and the left and right side posts tilt, whereby the two front wheels can be inclined to the left and right.

JP 2002-337779 A

However, in the above-described three-wheeled bicycle, the entire two front wheels are disposed at positions below the left and right side posts via the left and right front forks, so that the center of gravity of the entire bicycle is high and unstable. there were.
For this reason, for example, there were problems that it was difficult for elderly people, children, etc. to get on and off the bicycle, or to operate the steering wheel during traveling.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a three-wheeled bicycle with improved stability when traveling and when getting on and off.

In order to achieve the above object, the three-wheeled bicycle of the present invention is
Two front wheels, one rear wheel, a handle, a steering shaft to which the handle is fixed, a handle post that rotatably supports the steering shaft, and a pair disposed with the handle post interposed therebetween The side posts, a pair of front wheel support portions that rotatably support the two front wheels, and the handle posts and the pair of side posts are coupled to each other and rotated according to the right and left inclination of the handle posts. A three-wheeled bicycle comprising a movable swinging arm, a front wheel turning mechanism connected to the steering shaft and the pair of front wheel support portions and turning the two front wheels to the left and right;
In the pair of front wheel support portions, inner axle support portions that respectively support the inner sides of the axles of the two front wheels are formed below, and the inner axle support portions protrude from below into the pair of side posts . And a pair of inner front wheel support portions that are rotatably supported in the pair of side posts, respectively, and an outer axle support portion that respectively supports the outer sides of the axles of the two front wheels. And a pair of outer front wheel support portions respectively fixed above the pair of inner front wheel support portions,
The two front wheels are arranged such that the upper portions thereof overlap with the pair of side posts in the height direction .

  Further, the two front wheels are respectively disposed between the pair of side posts and the pair of outer front wheel support portions.

Further, the pair of front wheel support portions includes a pair of connecting members that connect the pair of inner front wheel support portions and the pair of outer front wheel support portions, respectively.
The pair of connecting members may be connected to the front wheel turning mechanism.

  The pair of inner front wheel support portions may be rod-shaped, and the pair of outer front wheel support portions may be curved.

In addition, it is disposed above the swing arm, is connected between the handle post and one of the pair of side posts, and can be rotated in an auxiliary manner according to the left / right inclination of the handle post. A first auxiliary swing arm;
A second wheel disposed above the swinging arm, connected between the handle post and the other of the pair of side posts, and capable of rotating in an auxiliary manner according to a left / right inclination of the handle post. The auxiliary swing arm may be provided.

  Further, a loading platform may be disposed between the two front wheels.

  According to the present invention, it is possible to provide a three-wheeled bicycle with improved stability during traveling and when getting on and off.

1 is a side view illustrating an overall configuration of a three-wheeled bicycle according to an embodiment of the present invention. It is a front view of the three-wheeled bicycle shown in FIG. FIG. 2 is a partially omitted plan view of the three-wheeled bicycle shown in FIG. 1. FIG. 2 is a partially omitted exploded perspective view of a mechanism for tilting a front wheel of the three-wheel bicycle shown in FIG. It is sectional drawing for demonstrating the connection of the upper auxiliary | assistant swing arm of the three-wheeled bicycle which concerns on embodiment of this invention. It is sectional drawing for demonstrating the connection of the lower swing arm of the three-wheeled bicycle which concerns on embodiment of this invention. It is a side view of the upright posture maintenance mechanism of the three-wheeled bicycle concerning the embodiment of the present invention, and its circumference. It is a disassembled perspective view for demonstrating the coupling | bonding of the handle post of the three-wheeled bicycle which concerns on embodiment of this invention, and the main frame of a rear frame. It is the front view which showed the state in which the front wheel of the three-wheeled bicycle which concerns on embodiment of this invention inclined to the left. It is a front view of the three-wheeled bicycle which concerns on the modification which used only the inner front wheel support part as the front wheel support part. FIG. 10 is a partially omitted front view of a loading platform of a three-wheeled bicycle according to a modified example in which a loading platform is disposed between two front wheels, and the vicinity thereof.

  A three-wheeled bicycle according to an embodiment of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 and 2, the three-wheel bicycle 1 has two front wheels 11 </ b> L and 11 </ b> R, a rear wheel 51 that is one drive wheel, a handle 12, and a handle 12 that is fixed and supports the handle 12. A steering shaft 13, a handle post 14, a pair of side posts 15L, 15R, a pair of front wheel support portions 16L, 16R, an upper auxiliary swing arm 17 (17L, 17R), a lower swing arm 18, It has an upright posture holding mechanism 19, a front wheel turning mechanism 20, and a brake lever 22.
Note that the brake mechanism and mudguards other than the brake lever 22 are omitted for easy understanding of the drawings. In the present embodiment, the right side is described as right and the left side as left based on the driver of the tricycle 1.

The tricycle 1 includes a mechanism for tilting the two front wheels 11L and 11R to the left and right in order to facilitate traveling on an inclined surface (bank traveling).
The mechanism for tilting the two front wheels 11L, 11R to the left and right is composed of a handle post 14, a pair of side posts 15L, 15R, an upper auxiliary swing arm 17 (17L, 17R), and a lower swing arm 18.

  The handle post 14 supports the steering shaft 13 so as to be rotatable. The handle post 14 has upper and lower bearings 14a and 14a for supporting the steering shaft 13 so as to be rotatable. Further, as shown in FIGS. 2 to 4, the handle post 14 has an upper auxiliary swing arm connecting portion 14b for connecting the upper auxiliary swing arms 17L and 17R so as to be rotatable upward, and a lower swing of the handle post 14 downward. A lower swing arm connecting portion 14c that rotatably connects the arm 18 and a flange connecting portion 14d for connecting to a main frame 53a of a rear frame 53 described later.

  The upper auxiliary swing arm connecting portion 14b is formed in a flat plate shape, and two screw holes 141b are formed in the front and rear. The lower swing arm connecting portion 14c protrudes in the front-rear direction, and screw holes 141c are formed in the front-rear direction.

  The pair of side posts 15L, 15R are respectively arranged in a C-shape inclined on both the left and right sides with the handle post 14 interposed therebetween. As shown in FIGS. 2 and 4, the side posts 15L and 15R are cylindrical main body portions 151L and 151R, upper auxiliary swing arm connecting portions 152L and 152R, lower swing arm connecting portions 153L and 153R, Bearings 154L and 154R are provided.

  Inside cylindrical main body portions 151L and 151R, inner front wheel support portions 162L and 162R, which will be described later, constituting front wheel support portions 16L and 16R, are rotatably supported via bearings 154L and 154R, respectively. Two bearings 154L and 154R are arranged above and below the main body portions 151L and 151R, respectively.

  The upper auxiliary swing arm connecting portions 152L and 152R connect the upper auxiliary swing arms 17L and 17R so as to be rotatable. The upper auxiliary swing arm connecting portions 152L and 152R are provided to project outward and in the front-rear direction above the main body portions 151L and 151R, respectively. Screw holes 155L and 155R are formed in the front and rear of the upper auxiliary swing arm connecting portions 152L and 152R, respectively.

  The lower swing arm connecting portions 153L and 153R connect the lower swing arm 18 so as to be rotatable. The lower swing arm connecting portions 153L and 153R project in the front-rear direction below the main body portions 151L and 151R, respectively. Screw holes 156L and 156R are formed in the front and rear of the lower swing arm connecting portions 153L and 153R, respectively.

  The pair of front wheel support portions 16L and 16R respectively support the two front wheels 11L and 11R so as to be rotatable. The pair of front wheel support portions 16L and 16R includes curved outer front wheel support portions 161L and 161R arranged outside the front wheels 11L and 11R, and rod-like inner front wheel support portions 162L and 162R arranged inside the front wheels 11L and 11R. And connecting members 163L and 163R for connecting the outer front wheel support portions 161L and 161R and the inner front wheel support portions 162L and 162R, respectively.

Outer axle support portions 168L and 168R that support the outer sides of the axles 111L and 111R of the front wheels 11L and 11R are formed below the outer front wheel support portions 161L and 161R, respectively, and below the inner front wheel support portions 162L and 162R. Are formed with inner axle support portions 169L and 169R for supporting the inner sides of the axles 111L and 111R of the front wheels 11L and 11R, respectively.
The outer front wheel support parts 161L, 161R and the inner front wheel support parts 162L, 162R are connected by connecting members 163L, 163R to support the front wheels 11L, 11R so as to be rotatable.

  The pair of connecting members 163L and 163R are fixed to the upper ends of the outer front wheel support portions 161L and 161R, respectively. As shown in FIG. 4, the connecting members 163L and 163R are fitted with fitting holes 164L and 164R into which the upper portions of the inner front wheel support portions 162L and 162R are fitted, screw holes 165L and 165R, and screw holes 165L and 165R, respectively. Slits 170L and 170R (FIG. 3) communicating with each other are formed. Further, the connecting members 163L and 163R are also connected and fixed to the front wheel turning mechanism 20, respectively.

  The outer front wheel support portions 161L and 161R and the inner front wheel support portions 162L and 162R are fitted with the upper portions of the inner front wheel support portions 162L and 162R in the fitting holes 164L and 164R of the connection members 163L and 163R, respectively. The fastening bolts 166L and 166R are inserted into the screw holes 165L and 165R of the 163L and 163R, the nuts 167L and 167R are screwed into the fastening bolts 166L and 166R, and the slits 170L and 170R are respectively tightened and fixed. .

  The inner front wheel support parts 162L, 162R project the inner axle support parts 169L, 169R from the lower ends of the side posts 15L, 15R, and the outer front wheel support parts 161L, 161R from the upper ends of the side posts 15L, 15R by the connecting members 163L, 163R. The upper side to be connected is protruded and arranged in the side posts 15L and 15R so as to be rotatable.

The two front wheels 11L and 11R are respectively disposed between the side posts 15L and 15R in which the inner front wheel support portions 162L and 162R are disposed and the outer front wheel support portions 161L and 161R.
Further, the substantially upper half of the two front wheels 11L and 11R are respectively arranged at positions where they overlap the side posts 15L and 15R in the height direction.

  The upper auxiliary swing arm 17 serves to assist the lower swing arm 18 in a mechanism for tilting the two front wheels 11L and 11R to the left and right. The upper auxiliary swing arm 17 can be rotated in an auxiliary manner according to the left / right inclination of the handle post 14. The upper auxiliary swing arm 17 is disposed above the lower swing arm 18.

  The upper auxiliary swing arm 17 includes left and right upper auxiliary swing arms 17L and 17R. Further, as shown in FIGS. 3 to 5, the left upper auxiliary swing arm 17L includes a pair of front and rear upper auxiliary swing arms 171L and 172L, and the right upper auxiliary swing arm 17R includes a pair of front and rear upper swing arms. Upper auxiliary swing arms 171R and 172R.

Rotation support portions 173L and 173L are formed at both ends of the left front upper auxiliary swing arm 171L, and rotation support portions 174L and 174L are formed at both ends of the left rear upper auxiliary swing arm 172L. Are formed respectively.
Further, rotation support portions 173R and 173R are formed at both ends of the right front upper auxiliary swing arm 171R, and rotation support portions 174R and 174R are formed at both ends of the right front upper auxiliary swing arm 172R. Each is formed.

As shown in FIG. 5, bearings 31 and 31 with flanges are press-fitted before and after the rotation support portions 173L and 174L of the left upper auxiliary swing arms 171L and 172L, respectively.
The left upper auxiliary swing arms 171L and 172L have rotation support portions 173L and 174L that are formed on the upper auxiliary swing arm connecting portion 152L of the left side post 15L via the spacers 32 and 32, respectively. The screw holes 141b formed in the hole 155L and the upper auxiliary swing arm connecting portion 14b of the handle post 14 are respectively screwed to be connected to the handle post 14 and the left side post 15L so as to be rotatable.
As a result, the left upper auxiliary swing arm 17L is rotatably connected between the handle post 14 and the left side post 15L.

Similarly, flanged bearings 31, 31 are also press-fitted in front of and behind the rotation support portions 173R, 174R of the right upper auxiliary swing arms 171R, 172R, respectively.
The rotation support portions 173R and 174R of the right upper auxiliary swing arms 171R and 172R are formed on the upper auxiliary swing arm connecting portion 152R of the right side post 15R via the spacers 32 and 32 via the bolts 30. By screwing into the screw hole 155R and the screw hole 141b formed in the upper auxiliary swing arm connecting portion 14b of the handle post 14, respectively, the handle post 14 and the right side post 15R are rotatably connected.
As a result, the right upper auxiliary swing arm 17R is rotatably connected between the handle post 14 and the right side post 15R.

  As shown in FIG. 2, the left and right upper auxiliary swing arms 17 </ b> L and 17 </ b> R are arranged at the same height at a position orthogonal to the handle post 14 when the handle post 14 is in the upright posture.

  The lower swing arm 18 is a mechanism for tilting the two front wheels 11L and 11R to the left and right, and transmits the left and right tilt of the handle post 14 to the two front wheels 11L and 11R via the left and right side posts 15L and 15R. The lower swing arm 18 is rotatable according to the left / right inclination of the handle post 14.

The lower swing arm 18 includes a pair of front and rear lower swing arms 18a and 18b.
Rotating support portions 181a, 181a, and 181a are formed at both ends and the center of the front lower swing arm 18a, respectively.
Similarly, rotation support portions 181b, 181b, and 181b are formed at both ends and the center of the lower swing arm 18b on the rear side. The rear lower swinging arm 18b is formed with a regulating plate 19a, which will be described later, constituting the upright posture holding mechanism 19 on the lower side of the center.

As shown in FIG. 6, bearings 31 and 31 with flanges are press-fitted before and after the rotation support portions 181a and 181b of the lower swing arms 18a and 18b, respectively.
The rotation support portions 181a and 181b of the lower swing arms 18a and 18b are screw holes 156L formed in the lower swing arm connecting portion 153L of the left side post 15L via the spacers 32 and 32, respectively. The handle post 14 is screwed into the screw hole 156R formed in the lower swing arm connecting portion 153R of the right side post 15R and the screw hole 141c formed in the lower swing arm connecting portion 14c of the handle post 14, respectively. And it is connected with a pair of side posts 15L and 15R so that rotation is possible respectively.
That is, the lower swing arms 18a and 18b are connected to the handle post 14 and the pair of side posts 15L and 15R so as to be rotatable.
When the handle post 14 is in the upright posture, as shown in FIG. 2, the lower swing arms 18a, 18b are parallel to the left and right upper auxiliary swing arms 17L, 17R and are orthogonal to the handle post 14. Respectively.

  The upright posture holding mechanism 19 is a mechanism for returning the left and right tilts of the handle post 14 tilted by traveling on an inclined surface to an upright posture. As shown in FIGS. 2, 4, and 7, the upright posture holding mechanism 19 includes a restriction plate 19a, a restriction protrusion 19b, a return spring 19c, and a spring stopper 19d.

The restricting plate 19a is formed at the lower center of the rear lower swing arm 18b. An arc-shaped regulating groove 191a is formed in the regulating plate 19a. Further, one end of a return spring 19c is fixed to the regulation plate 19a.
The return spring 19c is constituted by a metal tension coil spring.

The restricting protrusion 19b and the spring stopper 19d are protruded from the handle post 14. The restriction protrusion 19b is inserted into the restriction groove 191a of the restriction plate 19a.
The other end of the return spring 19c is fixed to the spring stopper 19d. Therefore, the return spring 19c is installed between the handle post 14 and the center of the lower swing arm 18b, and is disposed at the center of the entire three-wheeled bicycle 1.

When the bank travel in which the handle post 14 is tilted to the left and right is finished, the urging force that returns the handle post 14 to the upright posture side acts on the return spring 19c, and the upright posture of the handle post 14 is maintained.
Further, the restricting projection 19b loosely inserted into the restricting groove 191a abuts against the end of the restricting groove 191a, thereby restricting an excessive left / right inclination of the handle post 14.

  The front wheel turning mechanism 20 is a mechanism that turns the two front wheels 11L and 11R to the left and right during a curve run. As shown in FIGS. 2 to 4, the front wheel turning mechanism 20 includes a pitman arm 21, knuckle arms 22 </ b> L and 22 </ b> R, tie rods 23 </ b> L and 23 </ b> R, and a ball joint 24.

  The pitman arm 21 is connected and fixed above the operating shaft 13, and the knuckle arms 22L and 22R are connected and fixed to the connecting members 163R and 163L of the pair of front wheel support portions 16R and 16L, respectively. The pitman arm 21 and the knuckle arms 22L and 22R are connected via ball joints 24 by tie rods 23L and 23R.

  When driving the right curve, if the steering shaft 13 is rotated clockwise by the handle 12, two pit man arms 21, tie rods 23L, 23R, knuckle arms 22L, 22R and a pair of front wheel support portions 16R, 16L are used. The front wheels 11L and 11R turn to the right. Similarly, in traveling on the left curve, if the steering shaft 13 is rotated counterclockwise by the handle 12, the two front wheels 11L and 11R turn to the left.

  Further, as shown in FIG. 1, the three-wheeled bicycle 1 is fixed to a rear frame 53 connected to the handle post 14, a saddle 54, a rotatable crankshaft 55, and left and right ends of the crankshaft 55, respectively. A pair of pedals 56L, 56R, a large-diameter drive sprocket 57 attached to the crankshaft 55, a driven sprocket 58 attached to the rear wheel 51, and a chain 59 spanned between the drive sprocket 57 and the driven sprocket 58. is doing.

The rear frame 53 includes a main frame 53a, a saddle post 53b to which a saddle 54 is fixed, a reinforcing frame 53c provided between the main frame 53a and the saddle post 53b, and a pair of left and right rear forks 53d. ing.
As shown in FIG. 8, a flange coupling portion 531 a is formed at the front end of the main frame 53 a of the rear frame 53. In order to couple the handle post 14 and the main frame 53a of the rear frame 53, the flange coupling portion 14d and the flange coupling portion 531a are joined, and the nut 41 is screwed into the bolt 40.
By such a detachable coupling method, the mechanism on the rear frame 53 side can be freely combined with the mechanism on the handle post 14 side.

Here, a mechanism for tilting the two front wheels 11L and 11R described above left and right will be described. In the bank running, as shown in FIG. 9, when the handle post 14 is tilted to the left, the lower swing arm 18 rotates clockwise with respect to the driver, and the left and right side posts 15L and 15R are also on the left side. Lean to each.
In addition, the pair of front wheel support portions 16L and 16R are also inclined to the left via the left and right side posts 15L and 15R, respectively, and the two front wheels 11L and 11R are also inclined to the left.
At this time, the left and right upper auxiliary swing arms 17L, 17R rotate in a clockwise direction with respect to the driver as a reference in accordance with the inclination of the handle post 14 to the left, whereby the two front wheels 11L, 11R is stably tilted to the left.

Further, when the handle post 14 is tilted to the right during bank running, the lower swing arm 18 connected to the handle post 14 and the left and right side posts 15L and 15R rotates counterclockwise with respect to the driver. The left and right side posts 15L and 15R are also inclined to the right.
Further, the pair of front wheel support portions 16L and 16R are also inclined to the right side through the left and right side posts 15L and 15R, respectively, and the two front wheels 11L and 11R are also inclined to the right side.
At this time, the left and right upper auxiliary swing arms 17L and 17R rotate in a counterclockwise direction on the basis of the driver in accordance with the inclination of the handle post 14 to the right, thereby two front wheels 11L. , 11R are stably tilted to the right.

When the bank running is finished, the urging force for returning the handle post 14 to the upright posture acts on the return spring 19c of the upright posture holding mechanism 19, and the handle post 14 returns to the upright position.
When the handle post 14 is in the upright posture, the two front wheels 11L and 11R are arranged so as to be perpendicular to the ground as shown in FIG.

As described above, in the present embodiment, the inner front wheel support portions 162L and 162R constituting the front wheel support portions 16L and 16R are rotatably disposed in the side posts 15L and 15R, respectively. 11R is disposed between the side posts 15L and 15R and the outer front wheel support portions 161L and 161R, respectively, and the upper half of the two front wheels 11L and 11R is respectively positioned at the position overlapping the side posts 15L and 15R in the height direction. Can be arranged.
As a result, the center of gravity of the entire three-wheeled bicycle 1 can be lowered, so that, for example, an elderly person or a child can easily get on and off the bicycle, and the steering wheel operation becomes easy. Stability can be improved when getting on and off.

In the present embodiment, the upper auxiliary swing arms 17L and 17R have a pair of left and right structures and are used to assist the lower swing arm 18, so that when the three-wheeled bicycle 1 is assembled, it is strictly Precision is not required and assembly is facilitated.
When using the upper link and the lower link that have the same shape and the same length and play the same role as a mechanism that tilts the two front wheels to the left and right as in the past, the upper link and the lower link are attached. However, there is a problem that the handle operation may become difficult if there is a problem in the attachment of the upper link and the lower link.
In the present embodiment, such a problem can be solved, and the stability can be further improved when the three-wheeled bicycle 1 is traveling.

  In the present embodiment, since the return posture 19c, which is a metal tension coil spring, is used in the upright posture holding mechanism 19 of the handle post 14, the rubber spring used in the conventional upright posture holding mechanism is used. Thus, the characteristics do not change due to aging, and the returning of the handle post 14 to the original position in the upright posture can be stably maintained.

  In the present embodiment, when the handle post 14 is in the upright posture, the two front wheels 11L and 11R are arranged so as to be perpendicular to the ground. Can be reduced.

  While the present invention has been described with reference to the embodiment, the present invention is not limited to the above embodiment, and various modifications can be made. For example, in the present embodiment, an example has been described in which the front wheel support portions 16L and 16R are configured to connect the outer front wheel support portions 161L and 161R and the inner front wheel support portions 162L and 162R by the connecting members 163L and 163R. As shown in FIG. 10, the front wheel support portions 16L and 16R may be configured only by the inner front wheel support portions 162L and 162R. In this case, the knuckle arms 22L and 22R of the front wheel turning mechanism 20 are directly connected above the inner front wheel support portions 162L and 162R.

  In the present embodiment, the example in which the outer front wheel support portions 161L and 161R are connected to the inner front wheel support portions 162L and 162R using the connection members 163L and 163R has been described. However, the connection members 163L and 163R are not used. The outer front wheel support portions 161L and 161R and the inner front wheel support portions 162L and 162R may be integrally formed, or may be directly connected and fixed.

Moreover, as shown in FIG. 11, you may make it arrange | position the loading platform 60 between the two front wheels 11L and 11R. For example, when the rotation support portion 181a of the lower swing arm 18a on the front side is connected to the handle post 14 and the pair of side posts 15L, 15R using a bolt 30 or the like, the bolt 30 or the like is used for rotation. It is also possible to attach the loading platform 60 in front of the support portion 181a.
By attaching the loading platform 60 to a low position in this manner, the center of gravity of the three-wheeled bicycle 1 can be lowered, so that stability can be improved during traveling and when getting on and off.

  Further, in the present embodiment, by projecting only the vicinity of the inner axle support portions 169L, 169R of the inner front wheel support portions 162L, 162R from the lower ends of the side posts 15L, 15R, the substantially upper half of the two front wheels 11L, 11R is made to protrude. Although the example which can each be arrange | positioned in the position which overlapped with the side posts 15L and 15R in the height direction is demonstrated, for example, a part of upper part of the two front wheels 11L and 11R is the height of the side posts 15L and 15R. You may make it the structure arrange | positioned so that it may overlap in a direction.

  In the present embodiment, the rotation support portions 173L, 173R, 174L, and 174R of the upper auxiliary swing arms 17L and 17R and the rotation support portions 181a and 181b of the lower swing arm 18 are provided by a bearing 31 with a flange. Although it connects so that rotation is possible, the mechanism to connect is not restricted to this, For example, you may use a connection pin etc.

  In the present embodiment, an example in which the upper auxiliary swing arms 17L and 17R have a pair of left and right structures and are used to assist the lower swing arm 18 has been described. As described above, the present invention can also be applied to the case where the upper link and the lower link having the same shape and the same length that play the same role as a mechanism for tilting the two front wheels to the left and right are used.

  Further, in the present embodiment, the three-wheeled bicycle in which the inner front wheel support portions 162L and 162R are rotatably disposed in the side posts 15L and 15R are upper auxiliary swing arms 17L and 17R that assist the lower swing arm 18, respectively. However, the present invention is not limited to such a configuration. For example, as in the prior art, the two front wheels are arranged at positions below the left and right side posts via the left and right front forks. The bicycle may be provided with upper auxiliary swing arms 17L and 17R.

  In the present embodiment, an example in which the return spring 19c is used as the upright posture holding mechanism 19 of the handle post 14 has been described. However, the configuration of the upright posture holding mechanism 19 is not limited thereto, and for example, a conventional rubber spring is used. The present invention can also be applied to a case where an upright posture holding mechanism having a rod or an upright posture holding mechanism having a rod and a spring mechanism in a cylindrical body is used.

  In the present embodiment, an example in which curved outer front wheel support portions 161L and 161R are used has been described. However, the outer front wheel support portions 161L and 161R are not limited to a curved shape, and may be, for example, a rod shape or a straight rod shape. Good.

  Further, in the present embodiment, the example using the rod-shaped inner front wheel support portions 162L and 162R has been described, but the portions protruding from the side posts 15L and 15R of the inner front wheel support portions 162L and 162R are not limited to the straight rod shape, For example, it may be curved.

  In the present embodiment, the example in which the regulating plate 19a is formed on the lower center of the rear lower swing arm 18b has been described. However, the regulating plate 19a is formed on the lower swing arm 18a on the front side. Also good.

1 Three-wheeled bicycle 11L, 11R Front wheel 111L, 111R Axle 12 Handle 13 Steering shaft 14 Handle post 14b Upper auxiliary swing arm connecting portion 14c Lower swing arm connecting portion 14d Flange connecting portions 15, 15L, 15R Side posts 151L, 151R Parts 152L, 152R Upper auxiliary swing arm connecting parts 153L, 153R Lower swing arm connecting parts 16L, 16R Front wheel support parts 161L, 161R Outer front wheel support parts 168L, 168R Outer axle support parts 162L, 162R Inner front wheel support parts 169L, 169R Inner axle support portions 163L, 163R Connecting members 17, 17L, 17R, 171L, 171R, 172L, 172R Upper auxiliary swing arms 173L, 173R, 174L, 174R Rotation support portions 18, 18a, 18b Lower swing arms 181a, 181b Rotation support portion 19 Upright posture holding mechanism 19a Restriction plate 19b Restriction projection 19c Return spring 19d Spring stopper 20 Front wheel turning mechanism 51 Rear wheel 53 Rear frame 53a Main frame 531a Flange coupling portion 30 Bolt 31 Bearing 60 with flange Load bed

Claims (8)

Two front wheels, one rear wheel, a handle, a steering shaft to which the handle is fixed, a handle post that rotatably supports the steering shaft, and a pair disposed with the handle post interposed therebetween The side posts, a pair of front wheel support portions that rotatably support the two front wheels, and the handle posts and the pair of side posts are coupled to each other and rotated according to the right and left inclination of the handle posts. A three-wheeled bicycle comprising a movable swinging arm, a front wheel turning mechanism connected to the steering shaft and the pair of front wheel support portions and turning the two front wheels to the left and right;
In the pair of front wheel support portions, inner axle support portions that respectively support the inner sides of the axles of the two front wheels are formed below, and the inner axle support portions are protruded from below in the pair of handle posts. The three-wheeled bicycle is a pair of inner front wheel support portions that are respectively disposed and supported rotatably in the pair of side posts.   2. The three-wheeled bicycle according to claim 1, wherein the two front wheels are arranged so that an upper portion thereof overlaps with the pair of side posts in a height direction.   The pair of front wheel support portions includes a pair of inner front wheel support portions and an outer axle support portion that respectively supports the outer sides of the axles of the two front wheels. The three-wheeled bicycle according to claim 1 or 2, further comprising a pair of outer front wheel support portions fixed upward.   The three-wheel bicycle according to claim 3, wherein the two front wheels are respectively disposed between the pair of side posts and the pair of outer front wheel support portions. The pair of front wheel support portions includes a pair of connecting members that connect the pair of inner front wheel support portions and the pair of outer front wheel support portions, respectively.
The three-wheeled bicycle according to claim 3 or 4, wherein the pair of connecting members are respectively connected to the front wheel turning mechanism.   The three-wheeled bicycle according to any one of claims 3 to 5, wherein the pair of inner front wheel support portions are rod-shaped, and the pair of outer front wheel support portions are curved. A first wheel disposed above the swinging arm, connected between the handle post and one of the pair of side posts, and capable of rotating in an auxiliary manner according to a left / right inclination of the handle post. An auxiliary swing arm of
A second wheel disposed above the swinging arm, connected between the handle post and the other of the pair of side posts, and capable of rotating in an auxiliary manner according to a left / right inclination of the handle post. The three-wheeled bicycle according to any one of claims 1 to 6, further comprising an auxiliary swing arm.   The three-wheeled bicycle according to any one of claims 1 to 7, wherein a loading platform is disposed between the two front wheels.

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