JP2021130315A - Body tilting device of tadpole trike - Google Patents

Abstract

To provide a front wheel steering tadpole trike which an aged person can easily pedal even on a rugged road by adding a handle buffer to a structure which allows a person to get on a stopping tadpole trike without falling of the tadpole trike and allows a body of the tadpole trike to be mechanically tilted to a turning direction in accordance with steering of a handle.SOLUTION: A slide shaft of a linear bush 23 fixed to a connector 22 connected to a swing arm 41 via a link ball 21 and a front surface of a pendulum 31 are connected by a rod end Brg 25, and a rear part of the pendulum 31 and a rear part of a pitman arm 51 directly connected to a steering shaft 13 are connected so that they are turnable, and compression springs 36L and 36R are inserted between the pendulum 31 and support parts 53L and 53R of the pitman arm 51. When a front wheel 15L rides onto an obstacle 17, the swing arm 41 acts and the linear bush 23 is operated leftward to put the compression spring 36L in a compressed state, so that movement of the pitman arm 51 is stopped to make it difficult to transmit a shock to the handle 11.SELECTED DRAWING: Figure 2

Description

The present invention relates to a bicycle that is steered by two front wheels on the left and right to drive the rear wheels.

Conventionally, three-wheeled bicycles with front two-wheel steering are more resistant to tipping and more stable than ordinary two-wheeled bicycles, so they are being developed for elderly people and people who are not accustomed to riding bicycles. It was difficult to incline, and it was necessary to reduce the speed of the bicycle to an extreme (less than walking speed) due to the fear of falling outward due to centrifugal force. In order to solve this problem, as a three-wheeled bicycle having two front wheels on the left and right and one rear wheel, the following proposals have been made in order to facilitate curve running by mechanically tilting the vehicle body when turning.

For example, in Patent Document 1 already filed by the present applicant, the stability of the vehicle body is maintained by the upright posture holding function by the spring and the swing mechanism, and the slide shaft is incorporated in the bearing of the front hub attached to the swing arm. The front two wheels are turned to the left and right by the rotation of the steering pitman arm fixed to the steering shaft, and at the same time, the slide shaft and the linear bush are also linked to the left and right to adjust the turning angle of the front two wheels. In addition, the swing arm is tilted and the vehicle body is mechanically tilted in the turning direction, which makes it easier to tilt the body in the tilting direction of the vehicle body, enabling smooth curve running similar to that of a normal two-wheeled bicycle, and front two-wheel steering. Proposals have been made for stable running as a bicycle.

Japanese Patent No. 6030794

The three-wheeled bicycle described in Patent Document 1 maintains the stability of the vehicle body by the upright posture holding function by the spring and the swing mechanism, and can be stably ridden without falling even if both feet are placed on the pedal while the bicycle is stopped. So, when driving on a curve, the vehicle body automatically tilts in the turning direction by operating the steering wheel, which enables stable driving. However, the steering wheel turning mechanism, the vehicle body tilting device, and the swing mechanism are directly connected. By doing so, the vehicle body is stable, but the movement of the front two wheels is directly transmitted to the steering wheel depending on the road conditions, and it is possible to run smoothly on a cleanly paved road, but the steering wheel is always on rough roads. Since it vibrates and is transmitted to the hand holding the handlebar, this problem is particularly noticeable on a bicycle road that is not well maintained, and complaints that it is difficult to ride have occurred.

Further, the introduction of the body tilting device in the front two-wheeled bicycle causes a problem that the manufacturing cost increases as compared with a normal two-wheeled bicycle due to the complicated mechanism, the increase in the number of parts and the processing time. ..

The present invention is intended to solve the problem of such a conventional configuration, and when the vehicle is stopped, the front two wheels exert an external force due to an obstacle while maintaining a stable state as before. The steering wheel is not directly affected by it even if it is received, or it has evolved into a structure that can be mitigated even if it receives an external force. The purpose is to eliminate dissatisfaction with difficulty in riding and reduce costs by creating a structure that allows elderly people and people who are not accustomed to riding to ride easily.

A movable connecting body (linear bush and slide shaft) below the center of the swing arm connected to the side post that supports the left and right front wheels of the front two-wheeled bicycle that steers the two front wheels and allows the vehicle body to tilt to the left and right. The connected universal joint (rod end Brg) and the central portion of the front surface of the pendulum body are connected, and the pendulum body is the rearmost portion of the pitman arm in which the rearmost connecting portion is directly connected to the traveling shaft for steering. An elastic body (push spring) rotatably connected to the connecting portion between the receiving surfaces on the left and right sides (outside) of the front surface of the pendulum body and the inside of the supporting portions located on the left and right sides of the central portion of the pitman arm. ) Is inserted, and when either the left or right side of the front wheel rides on an obstacle and the swing arm moves up and down, the pendulum swings left and right, the elastic body (push spring) absorbs the shock, and the swing of the handle is suppressed. The gist is that the equipment to be used is provided.

Members such as a swing arm connected to a side post that supports the left and right front wheels of a front two-wheeled bicycle that steers the two front wheels and the vehicle body can tilt to the left and right, and a fitting that supports the movable connecting body. It is formed in a substantially U shape, and the axes of the mounting screws for the ball-bearing shank of a commercially available link ball (universal joint) that is inexpensive and reliable are lined up and fixed on the same axis on both sides. The gist is that the holder portion of the link ball is fixed to another member to regulate the movement as a universal joint and to be configured as a rotatable bearing.

A stopper for adjusting the amplitude of the pendulum body is provided on the support portion of the pitman arm to regulate the movement of the pendulum body due to rotation within a certain width, and the action of the swing arm is the movement of the pendulum body. Within the regulation, the plurality of elastic bodies (push springs) act by the rotation of the pendulum body, and the vehicle body tilting device operates outside the regulation.

The detent for mounting the link ball has a long groove shape in which the steel plate is bent in a substantially U shape, and has a groove width of a size that allows multiple mounting portions of the holder portion of the link ball to be inserted and a predetermined length. It is formed so that it can be attached to the support frame of the vehicle body and the swing arm, and the gist is to improve workability when assembling the link ball.

According to the present invention, by providing the steering wheel shock absorber in the vehicle body tilting device by steering the steering wheel, the impact (kickback) on the steering wheel is reduced on uneven roads, riding on small obstacles, etc., and the speed is stable. Cost reduction by improving the workability when assembling each device and the structure that enables running and can use inexpensive commercial products that are mass-produced and guaranteed reliability for main parts such as suspension. Made possible.

It is a front view which shows the Example of the handle shock absorber added to the body tilting device of the front two-wheeled bicycle of this invention. It is a front view of the state where the front wheel rides on an obstacle from the state of FIG. 1 and the steering wheel shock absorber works. It is an enlarged front view of the main part of FIG. It is an enlarged front view of a main part of FIG. It is an enlarged sectional view of the main part AA of FIG. A cross-sectional view taken along the line BB in FIG. 5 shows a state in which the link ball is attached. The connection portion of the handle shock absorber is shown in the enlarged cross-sectional view taken along the line CC of FIG. It is a bottom view of FIG. It is the bottom view of the state where the front wheel rides on an obstacle and the steering wheel shock absorber works. FIG. 5 is a bottom view showing a state at the moment when the handle is turned to the left and the pendulum body is turned to the left from the state of FIG. It is a bottom view which shows the state which turned the handle further to the left from the state of FIG. 10 and actuated the vehicle body tilting device. FIG. 6 is a partially enlarged vertical cross-sectional view of the central portion of the swing arm and the linear bush connector for explaining the attachment of the link ball in FIG.

The front two-wheeled bicycle according to the embodiment of the present invention may be a one-wheeled rear wheel or a two-wheeled rear wheel. Regarding the handle shock absorber 3 added to the tilting device 2, the second embodiment describes two examples of how to attach the link ball L-type 21 and the link ball I-type 56 to each device. It will be described with reference to 12.

In the present embodiment, in the embodiment shown in FIG. 1, the handlebar is based on a straight-ahead state in which the bicycle rides on the three-wheeled bicycle 1, sits on the saddle 19, holds the grips 11L and 11R of the handlebar 11, and faces forward. The three-wheeled bicycle 1 will be described with the front wheels 15L and 15R being the front, the rear wheels 16 being the rear, the left hand side of the grip 11L being the left, and the right hand side of the grip 11R being the right. Further, the three-wheeled bicycle 1 will be described as the vehicle body 1 according to the situation of the text, and the description will be omitted for the brakes, pedals, and other devices that are not directly related to the vehicle body tilting device 2 of the three-wheeled bicycle 1 and the handle shock absorber 3 attached thereto. do.

In the basic structure related to the vehicle body tilting device 2 and the handle shock absorber 3 of the three-wheeled bicycle 1 shown in FIGS. 1 to 6, the steering shaft 13 connected to the handle 11 is attached to the steering bearing 14 of the handle post 12. Side posts 54L and 54R are arranged on the left and right sides of the support frame 17 which is axially supported and fixed toward the front of the handle post 12, and the link ball I type 56 (universal joint) and the link ball L type 21 (universal joint) are connected. It is connected to the knuckle arms 55L and 55R via the knuckle arms 55L and 55R, and the upper tip of the knuckle arms 55L and 55R and the upper tip of the pitman arm 51 are connected by the tie rods 57L and 57R via the link ball L-shaped 21 to form the turning mechanism 5. Has been done.

In the swing mechanism 4, the axes of the shank portion 21b with balls are fixed on the same line with two link balls L-shaped 21 facing each other at the center and both ends of the swing arm 41, and the link at the center is linked. The ball L-shape 21 is connected to the support frame 17, and the link ball L-shape 21 at both ends is connected to the side posts 54L and 54R to support the two front wheels 15L and 15R, and the leaf spring 42 is used for maintaining the upright posture. , The central portion is fixed to the support frame 17, both sides are connected to the spring receivers 43L, 43R, and the spring receivers 43L, 43R are fixed to the side posts 54L, 54R via a plurality of link ball L-shaped 21. There is.

In the handle shock absorber 3, the linear bush 23 (movable connecting body) and the slide shaft 24 ((movable connecting body)) connected to the central portion of the swing arm 41 by the connecting tool 22 are via the link ball L-shaped 21. The rod end Brg25 (universal joint) connected to the slide shaft 24 of the existing vehicle body tilting device 2 is connected to the front surface of the pendulum body 31, and the rear portion of the pendulum body 31 is the rear portion of the pitman arm 51. The push springs 36L and 36R (elastic body) are inserted between the receiving surfaces 32L and 32R of the pendulum body 31 and the support portions 53L and 53R of the pitman arm 51.

In the first embodiment, the rear portion of the pitman arm 51 remodeled into a new shape and the rear portion of the newly added pendulum body 31 are connected to the existing structure of the swing mechanism 4 and the turning mechanism 5 of the existing vehicle body tilting device 2. The configuration in which the handle shock absorber 3 is added to the vehicle body tilting device 2 will be described in detail below with reference to FIGS. 1 to 11.

In the pendulum body 31 shown in FIGS. 5, 7 and 8, the steel plate is bent and the connecting portion 33 is bent downward on the front surface to provide a connecting hole, and the receiving surfaces are provided on both the left and right sides immediately after the connecting portion 33. The 32L and 32R are also bent downward as side surfaces, the rear portion has a certain distance from the connecting portion 33 (preferably about 80 mm to 120 mm), and the connecting portion 34 is formed in a substantially semicircular shape to provide a connecting hole. Has been done.

It is desirable that the pendulum body 31 is formed by bending a stainless steel plate, but it can also be manufactured of an aluminum plate, aluminum die-cast product, or plastic if strength can be ensured by a rust-preventive iron plate or a forming method.

In the pitman arm 51 of the turning mechanism 5 shown in FIGS. 3, 5 and 8, the steel plate is bent and formed, and the front part is a link ball for connecting the tie rods 57L and 57R to the front part of the knuckle arms 55L and 55R. A connection portion of the L-shape 21 is formed, a substantially central portion is directly connected to the steering shaft 13, and a punch hole 58 having a size that allows sufficient movement to the left and right without contact with the linear bush 23 into which the slide shaft 24 is inserted is provided in front of the connecting portion. The left and right ends are bent downward to form support portions 53L and 53R on the outer surface in a state where the steering shaft 13 has a constant width (preferably about 100 m to 120 mm) in both the left and right side directions. The nut 62 is fixed. The rearmost portion has a certain distance (preferably about 80 mm to 120 mm) from the center of the steering shaft 13, a pendulum connecting portion 52 is formed in a substantially semicircular shape, and a bolt hole is provided.

Since a large force is applied to the pitman arm 51 due to tire resistance or the like when the front wheels 15L and 15R are steered, a steel plate having a strength capable of withstanding this force and having good workability is desirable.

In the handle shock absorber 3 shown in FIGS. 3 to 5, a pendulum connecting portion 52 at the rearmost portion of the pitman arm 51 directly connected to the steering shaft 13 and a connecting portion 34 at the rear portion of the pendulum body 31 are shown in FIG. The pendulum body is composed of a bush 35, a sliding washer 38, and a fixed washer 39 and is connected by a bolt 61 and a nut 62. The axis of the bolt 61 is used as a reference, and the pitman arm 51 shown in FIG. 9 is stopped. Below the rear portion of the pitman arm 51, 31 compresses the push springs 36L and 36R so that they can rotate left and right.

After connecting the pitman arm 51 and the pendulum body 31 at the rear portion, the support portions 53L and 53R of the pitman arm 51 and the receiving surfaces 32L and 32R of the pendulum body 31 shown in FIG. 7 have the same left and right dimensions. The push springs 36L and 36R are formed and inserted in a compressed state, and the stopper screws 37L and 37R are screwed into the nut 62 fixed to the pitman arm 51 and inserted into the inner diameters of the push springs 36L and 36R. Guides and movement (jumping out) prevention when the 36L and 36R are contracted are provided.

It is desirable that the push springs 36L and 36R have a wire diameter of 1.5 mm to 2.0 mm and an inner diameter of about 10 mm to 15 mm. Therefore, it is possible to arbitrarily change the wire diameters of the push springs 36L and 36R in consideration of the spring pressure while matching the sizes of the stopper screws 37L and 37R with the inner diameter sizes of the push springs 36L and 36R.

Normally, the push springs 36L and 36R are the same on the left and right, and the compression pressure is the same, so that the handle is always kept in the neutral position. It is also possible to change the compression pressure by changing the wire diameter, inner diameter, effective length, etc. of the push springs 36L and 36R.

The rod end Brg25 is connected to the connecting portion 33 of the pendulum body 31 shown in FIGS. 5 and 7 with a bolt 61 via a connecting pipe 26 for adjusting the vehicle body angle, and the rod end Brg25 is the rocking mechanism 4. A nut 62 is connected to a screw at the lower end of a slide shaft 24 incorporated in a linear bush 23 connected to a connector 22 below the center of the moving arm 41, and the swing arm 41 swings as shown in FIGS. 2 and 4. Depending on the operation, the rod end Brg25 can move left and right via the connector 22, the linear bush 23, and the slide shaft 24. 4 and 9 show a state in which the receiving surface 32L of the pendulum body 31 compresses the push spring 36L and rotates to the left in a state where the movement of the pitman arm 51 is suppressed, and the swing arm 41 rotates to the left. If it swings in the opposite direction, the receiving surface 32R of the pendulum body 31 compresses the push spring 36R and rotates to the right while the movement of the pitman arm 51 is suppressed.

The amplitude due to the rotation of the pendulum body 31 is determined by the size of the gap between the receiving surfaces 32L and 32R of the pendulum body 31 and the tips of the stopper screws 37L and 37R shown in FIG. The effect of the operation on the pitman arm 51 and the handle 11 shown in FIG. 9 is extremely small, and only the front wheels 15L and 15R move up and down, and the vehicle body 1 tilts to the left and right while the straight movement of the handle 11 is maintained. .. By moving the stopper screws 37L and 37R back and forth, the amplitude due to the rotation of the pendulum body 31 can be freely adjusted, so that the amplitude can be freely adjusted according to the usage situation of the three-wheeled bicycle 1. After the adjustment, the stopper screws 37L and 37R can be fixed in the double nut state with one nut 62 that is not fixed to the pitman arm 51.

The fact that the pitman arm 51 and the swing arm swing without affecting the handle 11 means that the vehicle body 1 can freely tilt to the left and right while keeping the handle 11 in a straight-ahead state, and when the vehicle is stopped, the vehicle body 1 can freely tilt to the left or right. It tilts to the left or right and becomes unstable. Therefore, the inclination angle is changed to the left and right by adjusting the gap between the receiving surfaces 32L and 32R of the pendulum body 31 and the tips of the stopper screws 37L and 37R and the compression pressure of the push springs 36L and 36R, and the individual rider. Adjust the stable tilt angle according to the difference and the proficiency level of riding the three-wheeled bicycle 1.

When the front wheels 15L and 15R ride on a large obstacle, the amplitude of the pendulum body 31 becomes large, and an impact is directly applied to the stopper screws 37L and 37R, the impact is transmitted to the steering wheel through the pitman arm 51. This can be solved by widening the gap between the tips of the stopper screws 37L and 37R and the receiving surfaces 32L and 32R and increasing the spring pressure of the push springs 36L and 36R. Adjust with the handle shock absorber 3 in consideration of the stability of 1.

The relationship between the steering wheel shock absorber 3 and the steering of the front wheels 15L and 15R shown in FIG. 10 is that when the steering wheel 11 is turned to the left and the pitman arm 51 is rotated to the left, the push spring 36R on the right side is compressed. Until the tip of the stopper screw 37R comes into contact with the receiving surface 32R of the pendulum body 31, the front wheels 15L and 15R are steered by moving the tie rods 57L and 57R to the left within the range where the steering wheel 11 is turned. Since resistance is applied to the 15L and 15R, the swing arm 41 is difficult to swing (changes depending on the strength of the compression pressure of the push springs 36L and 36R), and the movement of the front wheels 15L and 15R is further suppressed. When the handle 11 is turned to the left, the pitman arm 51, as shown in FIG. 11, rotates to the left, the stopper screw 37R pushes the receiving surface 32R of the pendulum body 31, and the slide shaft is acted by the action of the vehicle body tilting device 2. The 24 and the linear bush 23 move to the left, the side post 54L is lifted by the swinging action of the swinging arm 41 shown in FIG. 4, and the front wheel 15L, which is the inner wheel side at the time of a left curve, is lifted upward to move the vehicle body 1. It automatically tilts to the left. When the handle 11 is turned to the right, the movement is the same to the right.

When the gap between the tips of the stopper screws 37L and 37R and the receiving surfaces 32L and 32R is widened by the adjustment method of the handle shock absorber 3 and the compression pressure of the push springs 36L and 36R is increased, the tips of the stopper screws 37L and 37R are opened. It is also possible to directly push the receiving surfaces 32L and 32R while the push springs 36L and 36R are compressed without contacting the receiving surfaces 32L and 32R.

When the handle 11 is turned to the left and the vehicle body 1 is tilted to the left, the push spring 36L on the left side is extended, a gap is generated between the stopper screw 37L and the receiving surface 32L, and the pendulum body 31 is rotated to the left. It becomes possible to move, and there is a margin for the front wheel 15L to move upward (in this case, there is no margin for the front wheel 15R), and it is possible to absorb the impact when the front wheel 15L on the tilted side rides on an obstacle.

As a result, when the vehicle body 1 is mechanically tilted to the left by the vehicle body tilting device 2 and then the body is consciously tilted to the left when turning at a high speed, the vehicle body is in a state where the handle 11 is not affected. 1 can be tilted further to the left, and when the speed is low, the body is tilted to the right, so that the vehicle body 1 is only mechanically tilted to the left by the action of the vehicle body tilting device 2, and how to hang the center of gravity of the body. Although it is a small range, it is possible to control the inclination of the car body.
The same effect as above is exhibited when the steering wheel is turned to the right.

On a road with a left-right inclination, the three-wheeled bicycle 1 has a problem that the vehicle body 1 is inclined to the inclination side of the road and it is difficult to ride when traveling straight, but the body is consciously moved to the opposite side of the road inclination. By tilting it down to, the handle shock absorber 3 returns the vehicle body 1 to a state slightly close to vertical, enabling stable straight running.
However, since the inclination angle of the vehicle body can be different depending on the lateral swing width of the pendulum body 31, it is difficult to be in a vertical state when seeking stability when the vehicle is stopped, and it is vertical if the stability when the vehicle is stopped is slightly sacrificed. It becomes easy to become a state. This issue can be adjusted arbitrarily.

In the second embodiment, in order to effectively use the commercially available link ball L type 21 (universal joint) and the link ball I type 56, a steel plate is bent and formed, and a plurality of link ball L type 21 and a link ball are formed. The configuration incorporated into the vehicle body tilting device 2, the swing mechanism 4, and the turning mechanism 5 of the front two-wheeled bicycle as a rotatable bearing by the I type 56 is described in detail with reference to FIGS. 1 to 6 and 12 below. Explain to.

The link ball L-shaped (name slightly different depending on each manufacturer) 21 shown in FIG. 12 is a popular product widely available on the market, and a high-strength zinc alloy or A-1 alloy is used for the holder portion 21a and is high. A screw 21c is specially welded to a precision steel ball, and a shank portion 21b with a ball is formed at a right angle to the holder portion 21a. Grease pockets 21d are arranged above and below the spherical surface portion to provide good lubricity, and the universal joint has a structure that can withstand the strength in the radial direction with respect to the axis of the screw 21c of the shank portion 21b with a ball.

Conventionally, as an example of using the link ball L type 21, the tie rods 57L and 57R shown in FIGS. 1 to 4 are used alone for connecting with other parts, but in this embodiment, they are shown in FIG. The axes of the screws 21c of the shank portion 21b with balls are arranged on the same line on the left and right sides of the connecting tool 22 of the steel plate that is bent and formed in a substantially U shape, with the link ball L-shaped 21 facing each other. It is fixed with a nut 62. As long as the axes of the screws 21c of the shank portion 21b with balls are on the same line on the left and right, the link ball L-shaped 21 does not need to oppose each other and may be in a permutation depending on the usage situation.

The holder portion 21a of the link ball L-shaped 21 fixed to the connector 22 shown in FIG. 12 is fixed to the left and right of the central portion of the upper swing arm 41 with bolts 61, and the axes of the bolts 61 are in a parallel state. There is. As a result, the holder portion 21a of both link ball L-shaped 21 and the shank portion 21b with the ball are fixed at a right angle, and rotate in the radial direction with reference to the axis of the screw 21c of the shank portion 21b with the ball. A plurality of shank portions 21b with balls were fixed on the same axis, and by fixing the holder portion 21a, a bearing was formed in which the movement of the universal joint alone was restricted and the universal joint was rotated in a fixed direction. According to this, the connector 22 also rotates only in a certain direction, and the vehicle body tilting device 2 operates.

The swing arm 41 of the swing mechanism 4 shown in FIGS. 5 and 12 is formed in a substantially U-shaped (cross-sectional shape) elongated groove shape, and a shank with a ball in a state where the link ball L-shape 21 at the center faces each other. The axes of the screws 21c of the portion 21b are arranged on the same line on the left and right, and are fixed by nuts 62, and the attachment portion of the holder portion 21a is fixed to the support frame 17 with bolts 61 facing upward.

On both sides of the swing arm 41 shown in FIGS. 3 and 6, the shank portion 21b with a ball of the link ball L-shaped 21 is fixed in the same manner as the central portion, and the attachment portion of the holder portion 21a faces downward and the side post 54L. , 54R is fixed to the lower part with a bolt 61.

The spring receivers 43L and 43R shown in FIGS. 3 to 6 also have the link ball L-shaped 21 with a ball-mounted shank portion 21b fixed to the portion formed in a substantially U shape, and the attachment portion of the holder portion 21a faces downward and sideways. It is fixed to the upper part of the posts 54L and 54R with a bolt 61.

The link ball I type 56 shown in FIGS. 3 and 6 is also a popular product widely available on the market. The material of the holder portion 56a and the shank portion 56b with a ball are the same as the link ball L type 21, and the shank with a ball. A universal joint having a structure in which the axis of the portion 56b and the axis of the holder portion 56a are arranged on the same line and can withstand a load in the axial direction.

The knuckle arms 55L and 55R of the turning mechanism 5 shown in FIGS. 3, 5 and 6 are provided with a connecting portion of a link ball L-shaped 21 in which a steel plate is bent and the tie rods 57L and 57R are connected to the front. A steel plate bent into a substantially U shape to which the side posts 54L and 54R can be connected via the link ball I type 56 and the link ball L type 21 is fixed to the central portion.

The shank portion 56b with a ball of the link ball I type 56 is fixed to the upper end surface of the steel plate bent in a substantially U shape fixed to the central portion of the knuckle arms 55L and 55R shown in FIGS. 3 and 6. The holder portion 56a is fixed to the upper part of the side posts 54L and 54R, and the ball-mounted shank portion 21b of the link ball L-shaped 21 is arranged on the same line in the vertical direction as the axis of the ball-mounted shank portion 56b on the lower end surface. The holder portion 21a is fixed in the perpendicular direction, and the mounting portion is fixed to the side surface of the side posts 54L and 54R to form a rotatable bearing, based on the axes of the ball-mounted shank portion 56b and the ball-mounted shank portion 21b. , The knuckle arms 55L and 55R rotate, and the front wheels 15L and 15R can be steered to the left and right.
As a result, the link ball I type 56 mainly receives the load of the vehicle body 1 and the push-up load of the front wheels, and the link ball L type 21 receives the radial load at the time of turning, which enables smooth straight running and curved running. There is.

In the detent 45 shown in FIGS. 6 and 12, the steel plate is bent and formed in the shape of channel steel, and the groove portion has a width into which the square portion of the holder portion 21a of the link ball L-shaped 21 can be inserted and the link ball L. A plurality of holder portions 21a of the shape 21 are formed to have a length having a predetermined interval that can be set, and are arranged on the swing arm 42 and the support frame 17.

When the holder portion 21a of the link ball L-shaped 21 inserted into the bent groove portion is attached to the support frame 17 and the swing arm 41 shown in FIG. 12, it is in a state of being stuck in the groove even if it is tightened by the bolt 61. It doesn't turn. Further, the detent 45 clearly determines the positional relationship between the shank portion 21b with balls and the holder portion 21a, and it is not necessary to align the holder portion 21a and the shank portion 21b with balls to correct the twist, resulting in good workability. It becomes.

Since the link ball fixing portions 59 of the side posts 54L and 54R shown in FIGS. 3 and 6 are bent and formed in advance according to the width of the holder portion 21a, they are formed as fixing portions that also serve as detents.

In this embodiment, the steel plate portion bent in a substantially U shape is fixed to the central portion of the knuckle arms 55L and 55R (joining by welding), and the support column 18, the support frame 17, and the handle post 12 are joined (by welding). Other than joining), the steel plate is bent and assembled, and the workability is improved by the structure that does not require a relatively high level of work skill, including the detent, and the weight is also reduced by the bending of the steel plate.

Although the embodiments of the present invention have been described in detail in the two examples, the present invention is not limited to the above embodiments and various modifications can be made without departing from the spirit of the present invention.
For example, in this embodiment, a plurality of push springs 36L and 36R are used for buffering the pendulum body 31, but it is also possible to change the shape of the pendulum body 31 and use a leaf spring.

1 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Three-wheeled bicycle (body)
11 ・ ・ ・ ・ ・ ・ ・ ・ Handle 11L, 11R ・ ・ ・ Grip part 12 ・ ・ ・ ・ ・ ・ ・ ・ Handle post 13 ・ ・ ・ ・ ・ ・ ・ ・ Steering shaft 14 ・ ・ ・ ・ ・ ・ ・ ・Steering bearings 15L, 15R ・ ・ ・ ・ ・ Front wheels 16 ・ ・ ・ ・ ・ ・ ・ ・ Rear wheels
17 ・ ・ ・ ・ ・ ・ ・ ・ Support frame 18 ・ ・ ・ ・ ・ ・ ・ ・ Support 19 ・ ・ ・ ・ ・ ・ ・ ・ Saddle 2 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Body tilting device 21 ・ ・ ・ ・ ・ ・・ ・ Link ball L type (universal joint)
21a ・ ・ ・ ・ ・ ・ ・ ・ ・ Holder part 21b ・ ・ ・ ・ ・ ・ ・ ・ ・ Shank part with ball 21c ・ ・ ・ ・ ・ ・ ・ ・ ・ Male screw 21d ・ ・ ・ ・ ・ ・ ・ Grease pocket 22 ・ ・ ・ ・ ・ ・ ・・ Connecting tool 23 ・ ・ ・ ・ ・ ・ ・ ・ Linear bush (movable connecting body)
24 ・ ・ ・ ・ ・ ・ ・ ・ Slide shaft (movable connecting body)
25 ・ ・ ・ ・ ・ ・ ・ ・ Rod end Brg (universal joint)
26 ・ ・ ・ ・ ・ ・ ・ ・ Connection pipe 3 ・ ・ ・ ・ ・ ・ ・ ・ Handle shock absorber 31 ・ ・ ・ ・ ・ ・ ・ ・ Pingient bodies 32L, 32R ・ ・ ・ ・ ・ Receiving surface 33 ・ ・ ・ ・ ・ ・ ・・ Connection part 34 ・ ・ ・ ・ ・ ・ ・ ・ Connection part 35 ・ ・ ・ ・ ・ ・ ・ ・ Bush 36L, 36R ・ ・ ・ Push spring (elastic body)
37L, 37R ・ ・ ・ ・ ・ Stopper screw 38 ・ ・ ・ ・ ・ ・ ・ ・ Sliding washer 39 ・ ・ ・ ・ ・ ・ ・ ・ Fixed washer 4 ・ ・ ・ ・ ・ ・ ・ ・ ・ Swing mechanism
41 ························································································································・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・・ ・ ・ Side post 55L, 55R ・ ・ ・ Knuckle arm 56 ・ ・ ・ ・ ・ ・ Link ball I type (universal joint)
56a ・ ・ ・ ・ ・ ・ ・ ・ ・ Holder part 56b ・ ・ ・ ・ ・ ・ ・ Shank part with ball 57L, 57R ・ ・ ・ ・ ・ Tie rod 58 ・ ・ ・ ・ ・ ・ ・ ・ Drilling hole
59 ・ ・ ・ ・ ・ ・ ・ ・ Link ball fixing part 61 ・ ・ ・ ・ ・ ・ ・ ・ Bolt 62 ・ ・ ・ ・ ・ ・ ・ ・ Nut 71 ・ ・ ・ ・ ・ ・ ・ ・ Obstacle

Claims (4)

In a front two-wheeled bicycle that is steered by two front wheels and the vehicle body can tilt to the left and right, a universal joint connected to a movable joint below the center of the swing arm connected to the side posts that support the left and right front wheels. And the front surface of the pendulum body are connected, and the rear connecting portion of the pendulum body is rotatably connected to the rear portion of the pitman arm directly connected to the steering shaft for steering, and the left and right sides of the pendulum body are connected. A vehicle body tilting device for a front two-wheeled bicycle, characterized in that elastic bodies are provided between both sides and the left and right support portions of the pitman arm, and a handle shock absorber is provided. In a front two-wheeled bicycle that is steered by two front wheels and the vehicle body can tilt to the left and right, a swing arm connected to a side post that supports the left and right front wheels, a connecting tool that supports a movable connecting body, and turning. Each member of the mechanism is formed in a substantially U-shape, and the axes of the ball-mounted shank portions of a plurality of link balls are fixed on the same line on both sides thereof to form a rotatable bearing. Body tilting device for front two-wheeled bicycles. The vehicle body tilting device for a front two-wheeled bicycle according to claim 1, wherein a stopper for adjusting the amplitude of the pendulum body is provided on the support portion of the pitman arm. The vehicle body tilting device for a front two-wheeled bicycle according to claim 2, wherein a groove into which the holders of the plurality of link balls can be inserted and a detent member having a predetermined length are provided.

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