JP5314176B1 - Tricycle - Google Patents

Abstract

Provided is a three-wheeled bicycle that is provided with a load bed on which two child seats can be set on the upper part of two front wheels, and is excellent in running on an inclined surface and stability when getting on and off.
One end of support frames 4U and 4D is joined to the lower side of the handle post 2 diagonally upward and forward, and a reinforcing frame 4a is joined to the other end of the front in a substantially vertical state. A pair of side posts 3L, 3R that are joined to one end of a load carrier frame 4b that is horizontally joined forward on the upper side of 2 and support two front wheels 11L, 11R arranged on the left and right of the support frames 4U, 4D. And, the upright posture holding mechanism 5 and the swing arm 6 are rotatably connected over the support frames 4U and 4D.
[Selection] Figure 1

Description

  The present invention relates to a three-wheeled bicycle that is steered by two left and right front wheels to drive a rear wheel.

Conventionally, compared to a two-wheeled bicycle, a three-wheeled bicycle is very stable because it hardly falls on a horizontal surface, but on an inclined surface, it becomes unstable and difficult to travel. In order to solve this problem, the following proposal has been made to facilitate traveling on an inclined ground as a three-wheeled bicycle having two front wheels on the left and one and one rear wheel.

The three-wheeled bicycle of Patent Document 1 has a handle post that supports a handle, and left and right front forks that are rotatably supported by side posts that are respectively arranged on both the left and right sides of the handle post. Each of the front forks is rotatably supported.
The left and right side posts are connected to each other at both ends and the handle post has a pair of rotatable upper links and lower links, and the upper and lower links are configured in the same shape and dimensions. ing.
As a result, a link mechanism that tilts the front two wheels to the left and right is configured by the left and right side posts and a pair of upper and lower links, and the upper and lower links rotate according to the left and right tilt of the handle post when running on an inclined surface. The front two wheels can be tilted to the left and right, and an upright posture holding mechanism is provided to maintain the stability of the tricycle.

In the three-wheeled bicycle of Patent Document 2, a handle post that supports the handle and a pair of side posts are arranged with the handle post interposed therebetween.
A pair of inner front wheel support portions are rotatably incorporated in the pair of side posts, the left and right front wheels are rotatably supported at the lower portion, and the upper portion is connected to the upper portions of the pair of outer axle support portions. The lower portions of the pair of outer axle support portions support the left and right front wheels from the outside.
A swingable swinging arm connected to the lower part of the pair of side posts and having a central part connected to the handle post, one end connected to the upper part of the left and right side posts, and the other end rotated to the handle post. The auxiliary swing arm is connected in a possible manner.
As a result, a pair of side posts, a lower swing arm, and an upper auxiliary swing arm constitute a mechanism for tilting the front two wheels to the left and right. The auxiliary swing arm can be rotated to tilt the front two wheels to the left and right according to the inclination of the left and right side posts, and an upright posture holding mechanism is provided to keep the three-wheeled bicycle stable.

JP 2002-337779 A JP 2010-163145 A

The three-wheeled bicycle described in Patent Document 1 is located at a position below the left and right side posts via the left and right front forks, so the center of gravity of the entire bicycle is high and unstable. Further, the structure of the left and right front forks, the link mechanism, and the upright posture holding mechanism has a problem that the weight of the entire bicycle becomes heavy.

The tricycle described in Patent Document 2 has been improved so that the center of gravity of the entire bicycle is lower than that of Patent Document 1, but is connected to the swing arm connected to the lower part of the side post and the upper part of the side post. A large number of bearings are used in the auxiliary swing arm, and the number of parts including the upright posture holding mechanism and the pair of outer front wheel support parts is increased, resulting in an increase in weight and cost of the entire bicycle. .

Further, the three-wheeled bicycles of Patent Document 1 and Patent Document 2 have a structure in which a handle post for supporting the handle and side posts are arranged on both the left and right sides of the handle post, respectively, and a large luggage is placed on the upper part of the two front wheels. There is a problem that it is difficult to set up a loading platform for loading.

The present invention is intended to solve the problems of such a conventional configuration, and further improves the mechanism for tilting the two front wheels to the left and right, lowers the center of gravity of the entire bicycle, and is easy to ride. The purpose is to be able to manufacture inexpensively by reducing the number, and to provide a loading platform on which the child seat for a bicycle can be set on the upper part of the two front wheels, so that a child can be safely placed.

In a three-wheeled bicycle that is steered by two front wheels and driven by rear wheels, a support frame is provided in front of a handle post that supports a steering shaft to which a handle is connected, and the two front wheels are turned to the left and right of the support frame. A pair of side posts that can be supported are disposed, and a central portion of a spring having an upright posture holding function of the handle post is fixed to an upper portion of the support frame, and both end portions of the spring are upper portions of the pair of side posts. The handle post is provided with an auxiliary peristaltic function, and the handle post is provided with an upright posture maintaining function and an auxiliary peristaltic arm function. To do.

A center portion of the swing arm is rotatably connected to a center bracket fixed to the support frame, and a lower portion of the pair of side posts and both ends of the swing arm are rotatably connected to each other. It is possible to swing according to the tilt to the left and right, and the pair of side posts are tilted to the left and right in conjunction with the spring.

A front part of a pair of knuckle arms formed integrally with a pair of brackets that support the pair of side posts disposed on the left and right sides of the two front wheels and the support frame, and a front part of a pitman arm located in the center part A ball joint and a connecting rod are rotatably connected to each other, and a rear part of the pitman arm and a turning sprocket are joined to each other and rotatably connected to a lower part of the center bracket fixed to the support frame. A side post is arranged between the sprocket and the steering sprocket fixed to the lower end portion of the steering shaft to which the handle is connected, and is arranged on the left and right of the support frame according to the steering of the handle. The structure is such that the two front wheels can be turned through

  The center bracket fixed to the support frame, and a mechanism that enables adjustment and restraint of the swing angle of the swing arm that is rotatably connected across the pair of side posts; It is characterized by a structure that can change the tilt of the vehicle body according to the situation.

A pair of side posts supporting the two front wheels so as to be able to turn, an initial swing arm, an upright posture holding mechanism, a front wheel turning mechanism, and a swing arm stopping mechanism are arranged between the two front wheels, The pair of side post turning mechanisms and the peristaltic arms, which require weight, are arranged in the vicinity of the axle, and have a low center of gravity.

A load carrier frame is provided above the support frame and in front of the handle post, and a lower portion of the load carrier frame and the tip of the support frame are connected by a reinforcing frame, so that a large capacity load carrier can be attached. It features a structure that can be set.

According to the present invention, since the center of gravity is lowered to enable traveling on an inclined surface, stability is improved during traveling and when getting on and off, and a pair of side posts supporting two front wheels are arranged in front of the handle post. As a result, a large-capacity loading platform can be attached, and a child seat for a bicycle can be stably loaded. Furthermore, the spring having both the upright posture holding function and the auxiliary swing arm function simplifies the structure and enables inexpensive manufacturing.

It is a side view showing the whole three-wheeled bicycle concerning the embodiment of the present invention. It is a front wheel part A arrow enlarged front view of FIG. FIG. 3 is a partially omitted plan view of FIG. 2. FIG. 3 is a partially omitted enlarged side view around a side post that supports the front wheel of FIG. 1. It is BB sectional drawing of FIG. It is CC sectional drawing of FIG. It is DD sectional drawing of FIG. It is EE sectional drawing of FIG. FIG. 4 is a partially omitted enlarged plan view of the front wheel turning mechanism of FIG. 3. FIG. 4 is a plan view showing a state in which a front wheel corresponding to FIG. 3 has turned to the right. FIG. 3 is a front view showing a state in which a front wheel corresponding to FIG. 2 is tilted to the left. It is a side view which shows the usage example of the loading platform frame of the front wheel upper part of FIG.

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

As shown in FIGS. 1 and 2, the three-wheeled bicycle 1 includes front wheels 11L and 11R that are steered by two front wheels on the front side of the body frame 14, a rear wheel 13 that is a driving wheel on the rear side, and a brake lever 2f. The steering shaft 2b to which the handle 2a having the handle is connected, the handle post 2, the support frames 4U and 4D provided in front of the handle post 2, the reinforcing frame 4a, the loading frame 4b, and the support frame 4U, A pair of side posts 3L, 3R that support the two front wheels 11L, 11R are arranged on the left and right sides of 4D, and the upright posture holding mechanism 5, the swing arm 6, the swing arm stopping mechanism 7, and the front wheel turning mechanism 8 are arranged. And a brake 10.

At the rear of the body frame 14, the saddle 15 is fixed to the saddle post 15a, the middle part of the saddle post 15a is joined to the rear end of the body frame 14, and the lower part of the saddle post 15a, the lower part of the auxiliary frame 14a, and the rear fork. 14b is joined to the drive bearing 16, and the structure including the rear wheel 13, the crankshaft 17, the crank petal 17a, the drive sprocket 18, the driven sprocket 18a, and the endless chain 18b is a conventional one-wheel bicycle. Detailed description will be omitted.
Parts other than the brake body 10 and the brake lever 2f, mudguards, stands, and ribs of some wheels are omitted for easy understanding of the drawing. In the present embodiment, the description will be made with the left hand side as the left and the right hand side as the right, based on the state where the driver sits on the saddle 15 of the three-wheeled bicycle 1 and holds the handle 2a.

The three-wheeled bicycle 1 shown in FIG. 1 and FIG. 2 has a support frame 4U, 4D provided in front of the handle post 2 and a reinforcing frame 4a for loading a large load on the front wheels 11L, 11R. And a pair of side posts 3L and 3R that support the front wheels 11L and 11R arranged on the left and right of the support frame 4U and the support frames 4U and 4D.

In order to facilitate bank traveling, the mechanism for inclining the front wheels 11L and 11R to the left and right shown in FIG. 11 is shown in FIG. 5, FIG. 6, and FIG. The side posts 3L and 3R arranged on the left and right sides of 4U and 4D, the plurality of swing arms 6, the upright posture holding mechanism 5 of the three-wheeled bicycle 1, and the side posts 3L and 3R and the center bracket 24 are connected. The swing arm 6 and the plurality of connecting shafts 23 that connect the plurality of springs 5 a of the upright posture holding mechanism 5, the bearing 21 that supports the connecting shaft 23, the bearing receiver 22, and the U-shaped bracket 25 are configured. .

The handle post 2 shown in FIG. 1 and FIG. 2 has a steering bearing 2c for supporting the steering shaft 2b so as to be rotatable, and the steering shaft 2b is supported by the handle post 2. A handle 2a having a brake lever 2f is connected to the top, and a screw hole for fixing the steering sprocket 2b is formed at the lower end.

As shown in FIGS. 1 and 4, one end of the support frames 4U and 4D is joined to the lower side of the handle post 2 in an obliquely upward front direction, and the reinforcing frame 4a is in a substantially vertical state at the other front end. It is joined. Furthermore, one end of the loading platform frame 4b is joined horizontally to the front above the handle post 2 and is joined to the support frames 4U and 4D in the vicinity of the other end in a substantially vertical state. Joined in a state of crossing at substantially right angles.

3, 4, and 5, a mounting plate 7 a bent with a metal plate is joined to the upper surface of the support frame 4 </ b> D, and a center bracket 24 is formed of a metal plate on the lower surface of the mounting plate 7 a. A plurality of mounting surfaces with a mounting hole formed on the upper part and a plurality of long holes for mounting the bearing holder set 8e on the lower surface, with the support frame 4D sandwiched between the upper part of the mounting plate 7a. The mounting surface is fixed.

The support frames 4U and 4D are preferably metal square pipes, but may be formed by bending a metal plate as long as the weight can be reduced. Further, the support frames 4U and 4D may be integrally formed by bending a metal plate, or may be formed by plastic as long as it has a predetermined strength.

The side posts 3L and 3R shown in FIG. 5 and FIG. 6 support the turning shafts 3La and 3Ra, and the turning bearings 3Lb and 3Rb for supporting the turning shafts 3La and 3Ra so as to be rotatable up and down. Have.
The turning shafts 3La and 3Ra are supported by the side posts 3L and 3R, there are no attachment parts at the upper part, and there are turning shaft support parts 3Lc and 3Rc at the lower end.

The pair of bent brackets 9L and 9R formed by bending the metal plate shown in FIG. 2, FIG. 5 and FIG. 9 have mounting holes for the axles 12L and 12R of the front wheels 11L and 11R on the vertical surface. Mounting holes for the turning shaft support portions 3Lc and 3Rc of the turning shafts 3La and 3Ra supported by the 3L and 3R are provided on the upper surface, and the side posts 3L and 3R are defined with reference to the vertical surface of the mounting holes of the axles 12L and 12R. The joint surfaces to be supported are formed symmetrically at the angles at which the side posts 3L and 3R are substantially C-shaped as shown in FIG. 5, and are directed forward as shown in FIG. 1 and FIG. Thus, the knuckle arms 9La and 9Ra are formed to be bent thinly, the mounting surface of the ball joint 8b at the tip protrudes outward, and is provided with a mounting hole, which is perpendicular to the vertical surface for mounting the axles 12L and 12R shown in FIG. Husband It is bent symmetrically formed.
The side posts 3L and 3R are formed in a substantially C-shape so that the angle adjustment at the time of assembly becomes unnecessary, and the number of parts is reduced by integration with the knuckle arms 9La and 9Ra.
The bent brackets 9L and 9R and the knuckle arms 9La and 9Ra can be divided and processed and connected.

The brake body 10 is connected to the axles 12L and 12R of the front wheels 11L and 11R shown in FIGS. 2 and 3, and the axles 12L and 12R are fixed to the vertical surfaces of the bent brackets 9L and 9R via the connecting pipes 9Lb and 9Rb. Thus, the front wheels 11L and 11R can be rotated.
The side posts 3L and 3R are arranged on the left and right with the support frames 4U and 4D shown in FIG. 5 as the center, have a substantially C-shaped angle, and support the turning shaft on the upper surfaces of the bent brackets 9L and 9R. The parts 3Lc and 3Rc are joined so as to be rotatable.

  The side posts 3L and 3R arranged in a square shape on the left and right sides of the support frames 4U and 4D shown in FIGS. 2 and 5 are supported as shown in FIGS. 1 and 4 when viewed from the side. Arranged in a state orthogonal to the frames 4U and 4D.

In FIG. 4, the side posts 3L and 3R and the handle post 2 do not have to be parallel on the vertical axis, and the side posts 3L and 3R are set to an angle with respect to the vertical axis based on the traveling of the tricycle 1. The handle post 2 can independently set the steering, the space of the front loading platform 41, and the angle with respect to the vertical axis in consideration of the design.

The cross-sectional arrangement of the side posts 3L, 3R is such that the position of the center line extending to the ground surface side of the turning shafts 3La, 3Ra supported by the side posts 3L, 3R is the front wheels 11L, 11R shown in FIG. When the front wheels 11L and 11R are turned to the left and right, the change in the dimension (tread) between the front wheels 11L and 11R is reduced.

The positional relationship between the handle post 2 and the side posts 3L and 3R is an isosceles triangle at the intersection of the center with the handle post 2 as a base point when viewed from the upper part of FIGS. The space between the handle post 2 and the side posts 3L and 3R can be freely changed. Accordingly, the lengths of the support frames 4U and 4D and the carrier frame 4b in FIG. 1 in the front-rear direction can be changed, and a large carrier can be installed on the carrier frame 4b.

5, 6, and 7, the plurality of oscillating arms 6 and the plurality of connecting shafts 23 that rotatably connect the upright posture holding mechanism 5 to the side posts 3 </ b> L and 3 </ b> R and the center bracket 24 are provided. , A screw is provided at both ends, a bearing 21 is inserted, a U-shaped bracket 25 that is loosely inserted into the bearing receiver 22 and bent by a metal plate is joined, and the side post 3L is joined by the U-shaped bracket 25. , 3R and the center part of the center bracket 24 are joined.
The connecting shaft 23, the bearing receiver 22, and the U-shaped bracket 25 preferably have the same shape and the same dimensions, and the cost can be reduced by sharing parts.

The upright posture holding mechanism 5 shown in FIG. 4, FIG. 5, and FIG. 7 is for returning the left and right inclinations of the handle post 2 tilted by bank running to the upright posture, and the upright posture holding mechanism 5 is A plurality of springs 5a, a plurality of spring receivers 5b, a single center spring retainer 5c, a plurality of side spring retainers 5d, and a plurality of metal washers 5e are formed, and the spring 5a is a plate spring formed of a metal plate. The central portion of the spring 5a is fixed to the upper surface of the support frame 4U by a center spring presser 5c having a shaft hole at both ends.

4 and 5, the spring receiver 5b is formed by bending a plurality of metal plates symmetrically in an L shape, each having a vertical surface and a horizontal surface, provided with an axial hole on each surface, Both ends of the spring 5a are fixed by side spring retainers 5d formed of a metal plate and having a shaft hole, and the vertical surfaces are inserted into the sides of the connecting shaft 23 with metal washers 5e, and then the vicinity of the side posts 3L and 3R. It is connected so as to be rotatable in a sandwiched state.
The connecting shaft 23 shown in FIG. 7 is joined to the outer side (wheel side) of the upper part of the side posts 3L, 3R by a U-shaped bracket 25.

The spring 5a has been described as a metal leaf spring. However, the spring 5a is in a state where a plurality of rod-like or wire-like ones are arranged, or a metal and plastic are combined into a plate shape. Special rubber or plastic may be used as long as it is maintained. Of course, the spring receiver 5b is also changed.
It is desirable that the spring 5a is disposed at a position in the vicinity of the center line of the left and right connecting shafts 23 shown in FIG.
Although a plurality of the springs 5a have been described, a single structure can be realized by changing the shape of the connecting shaft 23 or connecting pins.

As shown in FIG. 4, the swing arm 6 is formed by bending a metal plate into a U-shape, and has a center portion and shaft holes at both ends, and the shaft hole in the center portion is shown in FIGS. 5 and 6. The metal washer 5e is inserted into both sides of the connecting shaft 23 joined at the center of the center bracket 24 and immediately below the lower portion of the support frame 4D, and is then rotatably fixed.

Both ends of the swing arm 6 are connected to the inside (support frame 4D side) of the side posts 3L and 3R. After inserting metal washers 5e on both sides of the connecting shaft 23, shaft holes at both ends of the swing arm 6 are fitted. It is inserted and fixed, and is rotatably connected to the side posts 3L and 3R.

The side posts 3L and 3R are rotatably supported by a plurality of swing arms 6 and an upright posture holding mechanism 5, and as shown in FIGS. 2 and 5, the upright posture holding mechanism is provided via support frames 4U and 4D. The spring 5a of 5 is always kept horizontal, and the upright posture of the handle post 2 is maintained.

The swing arm 6 has a metal plate bent in a U shape for the purpose of weight reduction, but may be a flat plate or a rod. The material is preferably stainless steel or aluminum, but iron, reinforced plastic, etc. It is only necessary to maintain the strength to support the front wheels 11L and 11R as a bicycle.
Although a plurality of the swing arms 6 have been described, the shape of the connecting shaft 23 can be changed or a single structure can be formed by connecting pins or the like in association with the upright posture holding mechanism 5.

A mechanism for tilting the front wheels 11L and 11R described above to the left and right will be described. In the bank running, as shown in FIG. 11, when the handle post 2 is tilted to the left, the swing arm 6 rotates clockwise with respect to the driver, and the side posts 3L and 3R are also on the left side. The spring 5a of the upright posture holding mechanism 5 fixed to the support frame 4U is interlocked with the swing arm 6 via the side posts 3L and 3R, and bends clockwise with respect to the driver. It functions as an auxiliary swing arm and stably tilts the front wheels 11L, 11R to the left.

Further, when the handle post 2 tilts to the right during bank running, the lower swing arm 6 rotates counterclockwise with respect to the driver, and the side posts 3L and 3R also tilt to the right, The spring 5a of the upright posture holding mechanism 5 fixed to the support frame 4U is interlocked with the swing arm 6 via the side posts 3L and 3R, and bends counterclockwise with respect to the driver as an auxiliary swing. It functions as an arm and stably tilts the front wheels 11L and 11R to the right.

When the bank travel is finished, the spring 5a of the upright posture holding mechanism 5 is operated with a force to return the handle post 2 to the original state while maintaining the function of the auxiliary swing arm, and the handle post 2 returns to the original position and stands upright. Posture is maintained.
At this time, the front wheels 11L and 11R are arranged to be perpendicular to the ground as shown in FIG.

  When the handle post 2 shown in FIG. 11 is tilted to the left and right, the spring 5a of the upright posture holding mechanism 5 is bent and left and right from the bending portion of the end surface of the center spring retainer 5c that fixes the spring 5a to the support frame 4U. While the dimensions of the connecting shaft 23 connected to the side posts 3L and 3R to the central portion change according to the deflection amount, the connecting shaft 23 and the side posts 3L and 3R at the central portion of the swing arm 6 are connected. Since there is no change in the pitch dimension of the connecting shaft 23, the connection for connecting the swing arm 6 shown in FIG. 5 is necessary in order to keep the upper and lower wheels 11L and 11R tilted in a substantially parallel state. With respect to the pitch of the shaft 23, the length of the spring 5a is set to be slightly longer in consideration of the bending margin in the dimension from the deflection generating portion to the central portion of the connecting shaft 23 connected to the side posts 3L and 3R. However, it can be set freely depending on the purpose and characteristics of the tricycle.

As shown in FIGS. 5, 6, and 7, the central portion of the spring 5 a of the upright posture holding mechanism 5 is directly fixed to the support frame 4 </ b> U so that the connection shaft 23 is not necessary, and the connection disposed immediately below the support frame 4 </ b> D. The central portion of the swing arm 6 is fixed to the shaft 23 without obstructing the handle post 2, and one connecting shaft 23 can be arranged on each of the upper and lower connecting portions of the side posts 3 </ b> L and 3 </ b> R. The number of parts is small.
In addition, the connection between the spring 5a and the swing arm 6 has been described with the connection shaft 23 supported by the bearing 21, but it can be changed to a connection pin.

The front wheel turning mechanism 8 for steering the two front wheels 11L and 11R supported by the side posts 3L and 3R shown in FIGS. 3, 4, 8, and 9 supports the side posts 3L and 3R. The ball joint 8b is rotatably fixed to the knuckle arms 9La and 9Ra integrally formed with the bending brackets 9L and 9R, and the ball joint 8b is rotatable to the left and right of the front part of the pitman arm 8a located in the center. Are connected to a ball joint 8b which is divided into left and right and fixed to knuckle arms 9La and 9Ra by a connecting rod 8c.
The rear part of the pitman arm 8a and the turning sprocket 8d are fixed, and are rotatably connected to a bearing holder set 8e fixed to the lower surface of the center bracket 24.

The steering sprocket 2d is fixed to the lowermost end surface of the steering shaft 2b to which the handle 2a is connected, and the steering chain 2e is looped between the rear part of the pitman arm 8a and the fixed turning sprocket 8d. The left and right rotation is transmitted from the pitman arm 8a to the knuckle arms 9La and 9Ra via the steering chain 2e, and the front wheels 11L and 11R are turned through the side posts 3L and 3R.
Although the steering chain 2e has been described this time, a method using a timing pulley or a timing belt may be used.

The center bracket 24 is fixed to a mounting plate 7a bonded to the support frame 4D shown in FIGS. 5 and 8 in parallel with the side posts 3L and 3R, and the lower mounting surface is fixed to the bonding surface of the bearing holder set 8e. It protrudes forward and backward with a possible width, has a plurality of long holes for mounting, and is bent at a right angle to the handle post 2. Therefore, the turning sprocket 8d and the steering sprocket 2d shown in FIG. 4 are arranged and mounted on the same line, and the steering chain 2e is looped between them.
If the arrangement angle of the handle post 2 is changed, the bending angle of the lower mounting surface of the center bracket 24 is also changed in accordance with the arrangement angle of the handle post 2.

The bearing holder set 8e is moved by the long hole in the lower mounting surface of the center bracket 24, and the tension of the steering chain 2e is finely adjusted.
The mutual interval change between the steering sprocket 2d and the turning sprocket 8d by changing the arrangement of the side posts 3L and 3R is adjusted by the length of the chain.

5, 8, and 9, the pitman arm 8 a is bent with a metal plate, and has two left and right mounting holes for fixing the ball joint 8 b at the front end, and one shaft hole at the rear end. The turning sprocket 8d is fixed at the lower position with the mounting washer 8f sandwiched at the rear end, and is fixed to the lower part of the inner ring of the ball bearing 21 of the bearing holder set 8e via the spacer 8k so as to be rotatable. The steering chain 2e is looped between the steering sprocket 2d fixed to the lowermost end surface of the steering shaft 2b provided with the handle 2a supported by the handle post 2.

As shown in FIG. 2, it is desirable that the pitman arm 8a and the knuckle arms 9La and 9Ra be set in parallel so that the handle post 2 and the front wheels 11L and 11R are in an upright state. Adjustment is possible at the bent portion of the intermediate portion of the pitman arm 8a shown in FIG.

The lengthwise dimensions of the pitman arm 8a and the knuckle arms 9La and 9Ra are such dimensions that the steering wheel 2a can smoothly turn the front wheels 11L and 11R. In the state shown in FIG. 9, the center of the turning sprocket 8d The dimension from the center of the ball joint 8b connected to the pitman arm 8a to the center of the ball joint 8b connected to the knuckle arms 9La and 9Ra from the center of the side posts 3L and 3R is preferably the same. . However, when it is desired to make a difference between the steering angle of the handle 2a and the turning angles of the front wheels 11L and 11R, the lengths of the pitman arm 8a and the knuckle arms 9La and 9Ra can be changed.

  The steering wheel 2a shown in FIG. 2 is steered to the right, and the two front wheels 11L and 11R shown in FIG. 3 are turned about 45 degrees as shown in FIG. The reverse C-shaped state in which the upper portions of the two front wheels 11L, 11R are slightly opened is the influence of the side posts 3L, 3R being arranged in a C-shaped state as shown in FIG. In order for the 3R to improve the straight traveling performance when traveling, the upper part is arranged so as to incline backward, and this inclination and the angle of the reverse C-shape are combined, so that the inner ring side when turning to the right side, FIG. In this case, the upper part of the right front wheel 11R is further inclined to the right and is easy to bend, and the left front wheel 11L is almost vertical on the outer wheel side, and it is easy to step on the curve, thereby enabling smooth curve driving. .

FIG. 10 shows that the two front wheels 11L and 11R are turned about 45 degrees, and can be turned up to 55 degrees to 60 degrees in the middle of turning, so that a sufficient small turn is possible. Can be handled to the same extent.

The change in the contact width (tread) between the wheels when turning the front wheels 11L and 11R due to the arrangement of the front wheel turning mechanism 8 and the side posts 3L and 3R is the rightward turning when comparing FIG. 3 and FIG. At this time, the wheel is slightly narrowed, the wheel moves slightly at the ground contact portion, and the turning resistance is not small. Therefore, the steering resistance of the steering wheel is small, and the width (tread) between the wheels of the front wheels 11L and 11R can be freely set, and the front wheels 11L and 11R are smoothly turned during traveling, and the curve traveling is stabilized. In addition, a configuration in which the vehicle body is difficult to fall when getting on and off is possible.
The turning to the left side is the same as the turning to the right side, and smooth curve traveling is possible.

2, 3, 4, and 5, the swing arm restraining mechanism 7 is configured such that the handle post 2 is tilted left and right, the swing arm 6, the spring 5 a of the upright posture holding mechanism 5, and the left and right side posts. Inclination transmitted to the two front wheels 11L and 11R via 3L and 3R is restrained, and a mounting plate 7a formed by bending with a metal plate joined to the upper surface of the support frame 4D, and left and right adjustment screws 7b And a spring washer 33 and a nut 32.

The mounting plate 7a has a mounting surface of the center bracket 24 in the front, and a surface positioned at the upper part of the swing arm 6 is bent and formed in accordance with the swing angle of the swing arm 6 shown in FIG. The adjustment screw 7b fixed to the left and right of the mounting plate 7a is restrained at the position of the center portion in the width direction of the upper surface of the U-shaped bent portion of the swing arm 6.

When the front wheels 11L and 11R are in an upright state, the adjustment screw 7b has the tip end portion of the adjustment screw 7b arranged at the same left and right intervals as shown in FIG. 2 and FIG.
FIG. 11 shows a state in which the handle post 2 is tilted to the left. The tip of the left adjustment screw 7b is engaged with the upper surface of the swing arm 6, and the swing arm 6 is stopped.

The inclination angle of the handle post 2 is determined by the distance between the tip of the adjustment screw 7b and the upper surface of the swing arm 6, and can be freely set by the adjustment screw 7b for the purpose of traveling the three-wheeled bicycle 1. For example, when sports travel is intended, widening the interval and increasing the tilt angle makes it easier to turn a sharp curve at a high speed. When carrying a large load, when a child is placed on a bicycle child seat, the distance can be narrowed and the tilt angle can be reduced.

As shown in FIGS. 1, 2 and 3, the uppermost turning shafts 3La and 3Ra of the pair of side posts 3L and 3R which support the front wheels 11L and 11R so as to be turned are lower than the uppermost portions of the two front wheels 11L and 11R. The upright posture holding mechanism 5, the swing arm 6, the restraining mechanism 7, and the front wheel turning mechanism 8 are disposed below the turning bearings 3Lb and 3Rb above the pair of side posts 3L and 3R. All the mechanisms related to the traveling of the three-wheeled bicycle 1 other than the upper part of the reinforcing frame 4a that supports the vehicle, including the brake body 10, are arranged between the front wheels 11L and 11R.

If the spring 5a can secure a certain amount of bending, the size can be freely set in other parts and mechanisms. Therefore, any size of wheels used in general commercial bicycles can be moved into the front wheels 11L and 11R. Placement is possible.

Since the relatively heavy front wheel turning mechanism 8 and the peristaltic arm 6 are arranged in a state close to the center of the front wheels 11L and 11R, the center of gravity of the three-wheeled bicycle 1 is lowered, so that children and elderly people can easily ride and the running is stabilized. .

As shown in FIGS. 1 and 2, the carrier frame 4b joined to the handle post 2 is formed by bending a metal plate into a substantially U-shape. The reinforcing frame 4a joined to the front ends of the support frames 4U and 4D in a substantially vertical state is formed by bending a metal plate in a substantially U shape and joined to the lower part of the cargo bed frame 4b at a substantially right angle. Thereby, sufficient strength can be secured in the support frames 4U and 4D and the cargo bed frame 4b.
The carrier frame 4b and the reinforcing frame 4a may be metal square pipes. The same material as the support frames 4U and 4D is desirable.

A loading platform 41 having the same width as the front wheels 11L and 11R is joined to the loading platform frame 4b shown in FIG. 12, and a bicycle child seat 42 is set on the loading platform 41.
Since the side posts 3L, 3R that support the front wheels 11L, 11R are arranged in front of the handle post 2, the center of gravity of the bicycle child seat 42 is arranged at a position behind the vertical center line of the axles 12L, 12R. Sufficient stability can be ensured even with children.

The loading platform 41 is integrated with the vehicle body frame 14 via the handle post 2 and does not directly interlock with the turning of the front wheels 11L and 11R. Therefore, even if the two front wheels 11L and 11R turn when stationary, the direction of the bicycle child seat 42 is maintained. It remains stable without changing, and even during traveling, it is difficult for the small movement of the steering wheel 2a during turning to be transmitted to the bicycle child seat 42, so that safe traveling is possible.

Since the side posts 3L, 3R supporting the front wheels 11L, 11R are arranged in front of the handle post 2, the position of the center of gravity of the vehicle body moves rearward, holds the brake lever 2f for the front wheels 11L, 11R, and the brake body When 10 is braked, a sufficient braking force can be applied to the front wheels 11L and 11R, and the three-wheeled bicycle 1 can be stably stopped at a short distance.

Each component described above is fixed by a hexagon socket head bolt 8h, a hexagon bolt 31, a nut 32, a spring washer 33, and a flat washer 34, as shown in each drawing.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above-described embodiment, the case where the present invention is applied to a three-wheel bicycle driven by human power has been described. However, the present invention can also be applied to a three-wheel bicycle including a power source that assists human power and a three-wheel bicycle with a power source.

  In the embodiment of the present invention, since the front wheels 11L and 11R are supported on one side, the wheels of a wheelchair including the brake 10 can be used as well as the wheels of a normal bicycle.

Further, in the embodiment of the present invention, an example in which the support frames 4U and 4D are provided toward the front of the handle post 2 and the center portion of the spring 5a of the upright posture holding mechanism 5 is fixed to the upper surface of the support frame 4U has been described. However, a support frame is provided on the front and back of the handle post 2 and the central portion of the spring 5a is fixed on the front and back of the handle post 2, or a support frame is provided on either of the front and back to fix the side posts 3L and 3R. A configuration in which the handle post 2 is arranged on the left and right is also possible.

Further, in the embodiment of the present invention, the peristaltic arm 6 is bent in a U-shape with a metal plate, provided with a center portion, shaft holes at both ends, the center portion of the center bracket 24, and the side posts 3L, 3R. However, the structural part formed in a U-shape with a metal plate is a metal leaf spring having a strength equal to or greater than that of the spring 5a, and the connection structure is the same as that of the swing arm 6. It is also possible to use a configuration.

1 ... Tricycle 2 ... Handle post 2a ... Handle 2b ... Steering shaft 2c ... Steering bearing 2d ... Steering Directional sprocket 2e Steering chain 2f Brake lever 3L, 3R Side post 3La, 3Ra Turning shaft
3Lb, 3Rb Turning bearings 3Lc, 3Rc Turning shaft support portions 4U, 4D ··· Support frame 4a ··· Reinforcement frame 4b ··· Loading frame 5 ··· Upright posture holding mechanism 5a ··· ··· Spring 5b ··· Spring receiver 5c ··· Center spring retainer 5d ··· Side spring retainer 5e ··· Metal washer 6 ··· Peristaltic arm 7 ···・ ・ ・ Peristaltic arm stopping mechanism 7a ・ ・ ・ ・ ・ Mounting plate 7b ・ ・ ・ ・ ・ Adjustment screw 8 ・ ・ ・ ・ ・ Front wheel turning mechanism 8a ・ ・ ・ ・ ・ Pitman arm 8b ・ ・ ・ ・ ・ Ball joint 8c ... Connecting rod 8d ... Turning sprocket 8e ... Bearing holder set 8f ... Mounting washer 8h ... Hex socket head bolt 8k ... Pacer 9L, 9R ··· Bending bracket 9La, 9Ra Knuckle arm 9Lb, 9Rb Connecting pipe 10 ··· Brake body 11L, 11R Front wheel 12L, 12R Axle 13 · · · Rear wheel 14 · · · Body frame 21... Bearing 22... Bearing receiver 23... Connecting shaft 24... Center bracket 25... U-shaped bracket 31. ··· Nut 33 ··· Spring washer 34 · · · Flat washer
41 …… Loading platform 42 …… Bicycle child seat

Claims (6)

In a three-wheeled bicycle that is steered by two front wheels and driven by rear wheels, a support frame is provided in front of a handle post that supports a steering shaft to which a handle is connected, and the two front wheels are turned to the left and right of the support frame. A pair of side posts that can be supported are disposed, and a central portion of a spring having an upright posture holding function of the handle post is fixed to an upper portion of the support frame, and both end portions of the spring are upper portions of the pair of side posts. A three-wheeled bicycle characterized in that it is pivotably connected to each other, has an auxiliary swing function, and has a structure that gives the steering post to the right and left and a restoring force. A center portion of the swing arm is rotatably connected to a center bracket fixed to the support frame, and a lower portion of the pair of side posts and both ends of the swing arm are rotatably connected to each other. The three-wheeled bicycle according to claim 1, wherein the three-wheeled bicycle has a structure capable of swinging according to a left-right inclination. A front part of a pair of knuckle arms formed integrally with a pair of brackets that support the pair of side posts disposed on the left and right sides of the two front wheels and the support frame, and a front part of a pitman arm located in the center part A ball joint and a connecting rod are rotatably connected to each other, and a rear part of the pitman arm and a turning sprocket are joined to each other and rotatably connected to a lower part of the center bracket fixed to the support frame. A structure in which a chain is looped between the sprocket and the steering sprocket fixed to the lower end portion of the steering shaft to which the handle is connected, and the two front wheels can be turned according to the steering of the handle The three-wheeled bicycle according to claim 1 or 2, characterized in that.   The center bracket fixed to the support frame, and a mechanism that enables adjustment and restraint of the swing angle of the swing arm that is rotatably connected across the pair of side posts are provided. The tricycle according to any one of claims 1 to 3.   The pair of side posts that support the two front wheels in a turnable manner, the swing arm, an upright posture maintaining mechanism, a front wheel turning mechanism, and a swing arm stopping mechanism are disposed between the two front wheels. The three-wheeled bicycle according to any one of claims 1 to 4, wherein the three-wheeled bicycle is characterized. 6. A load carrier frame is provided above the support frame and in front of the handle post, and a lower portion of the load carrier frame and a tip end portion of the support frame are connected by a reinforcing frame. A tricycle according to any one.

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