JPH1053182A - Automatic self-supporting device for motor tricycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a front frame self-support automatically without a sense of incongruity by actuating a tilting inhibiting means at the time of vehicle speed being the specified value or less and at the time of input to a front brake for braking a front wheel or to a rear brake for braking rear wheels. SOLUTION: When vehicle speed is the specified value or less and brake input is the specified value or more, a cutoff valve 23 is actuated, that is, closed, and the closed state is displayed on an indicator 30. The cutoff valve 23 is not put in the closed state until reaching a stop state or getting sufficiently near the stop state even in a braking state, and cuts off a communicating oil passage 22 to hydraulically lock a piston 21 so as to inhibit tilting of a front frame Ff. The front frame Ff can thereby be self-supported without a sense of incongruity. At the same time, the tilting inhibited state of the front frame Ff is displayed on the indicator 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear frame for supporting a pair of left and right rear wheels, and a front frame which is connected to the left and right directions of the vehicle so as to be tiltable in a left and right direction of the vehicle and supports a single front wheel for steering. The present invention relates to an automatic self-standing device for a three-wheeled vehicle provided with a tilt inhibiting means for inhibiting the front frame from tilting.

[0002]

2. Description of the Related Art An automatic self-standing device for such a tricycle is already known as disclosed in Japanese Patent Application Laid-Open No. 60-169382. When the vehicle is stopped, the driver tilts in conjunction with the operation of the front brake for braking the front wheels or the rear brake for braking the rear wheels, so that the pilot can stand on its own without standing on the ground. The prohibition means is operated.

[0003]

However, if the tilt-inhibiting means is operated simply in conjunction with the operation of the front brake or the rear brake, the tilt of the front frame may be restrained while the vehicle speed is not sufficiently reduced. There is a feeling of strangeness in operation.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides an automatic self-standing device for a three-wheeled vehicle that can automatically self-stand a front frame without such a feeling of discomfort when the vehicle stops. With the goal.

[0005]

To achieve the above object, the present invention provides a rear frame for supporting a pair of left and right rear wheels, and a single front wheel connected to the rear frame so as to be tiltable in the left and right direction of the vehicle. In a self-standing device for a three-wheeled motor vehicle provided with a tilt prohibiting means for prohibiting tilting of the front frame between the front frame and the front frame which operably supports the front brake or the rear wheel for braking the front wheel. A first feature is that the tilt inhibition means is operated when the input to the rear brake is performed and the vehicle speed is equal to or lower than a predetermined value.

[0006] In addition to the above features, the present invention has a second feature in that the input to the brake is made when the brake input to the brake is a predetermined value or more.

[0007] In addition to the first or second feature, the present invention further comprises a tilt preventing means, a cylinder connected to one of the front frame and the rear frame, and a cylinder connected to the other of the cylinder and the cylinder. Into a first oil chamber and a second oil chamber, a piston that slides relatively in the cylinder in accordance with the tilt of the front frame, a communication oil path that connects the first and second oil chambers, and a communication oil passage. And a shut-off valve capable of cutting off the road to prevent the relative sliding of the piston, wherein the shut-off valve is operated when the brake input is equal to or higher than a predetermined value and the vehicle speed is equal to or lower than the predetermined value. Is a third feature.

Further, in addition to the third feature, the present invention is characterized in that, when the differential pressure between the first and second oil chambers is equal to or more than a predetermined value, the operation of the shut-off valve is prohibited. The feature of.

[0009] Further, in addition to the third or fourth feature, the present invention, when the pressure difference between the first and second oil chambers is equal to or more than a predetermined value, activates the engine output regulating device. Is the fifth feature.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on embodiments of the present invention shown in the accompanying drawings.

FIGS. 1 to 5 show a first embodiment of the present invention. FIG. 1 is a side view of a motorcycle, FIG. 2 is a schematic rear view thereof, FIG. 3 is an operation explanatory view, and FIG. FIG. 5 is a flowchart showing the relationship between the outputs of the vehicle speed sensor and the brake input sensor and the operation states of the tilt inhibiting means and the indicator.

First, referring to FIG. 1 and FIG.
The vehicle body F has a front frame Ff that steerably supports a front fork 2 that suspends a single front wheel Wf, and a rear frame Fr that suspends a pair of left and right rear wheels Wr, Wr. Ff and Fr are connected to each other via a tilt shaft 3 that tilts forward or upward so as to tilt in the left-right direction of the vehicle. A steering handle 4 is attached to the upper end of the front fork 2. A front brake lever is supported near the right grip of the handle 4, and a rear brake lever is supported near the left grip of the front fork 2. The front brake Bf for the front wheel Wf is operated, and the rear brake Br for the rear wheel is operated by operating the rear brake lever.

The front frame Ff is provided with an operator step floor 5, a seat 6, and a windshield 7 with a roof.

The carrier 8 is mounted on the upper surface of the rear frame Fr. A rear fork 9 is pivotally supported on the rear frame Fr so as to be vertically swingable, and a pair of left and right cushion units 11 is interposed therebetween. A power unit 12 including an engine is mounted on and supported by the rear fork 9, and rear wheels Wr, Wr are respectively mounted on both ends of an output shaft protruding left and right outside of the power unit 12. Therefore, the rear wheel Wr, Wr can be driven by the operation of the power unit 12 to drive the three-wheeled motor vehicle 1.

[0015] Between the front frame Ff and the rear frame Fr, there is provided a tilt inhibiting means 15 for inhibiting relative tilt of the both. The tilt inhibiting means 15 is slidably fitted to a cylinder 18 connected to the front end of the loading platform 8 via a pair of front and rear ball joints 16 and 17 and slidably fits the inside of the cylinder 18 to the first left side. A piston 21 for partitioning into an oil chamber 19 and a second oil chamber 20 on the right side;
Piston rods 21a protruding from both ends of the first frame 1 penetrate both end walls of the cylinder 18 and are fixed to the rear portion of the front frame Ff. The cylinder 18 has first and second oil chambers 19 and 20.
A communication oil passage 22 communicating between the communication oil passages is connected to the communication oil passage 2.
2 is provided with a normally-open type electromagnetic shut-off valve 23 capable of shutting it off. When the shut-off valve 23 is opened, the first and second oil chambers 19 and 20 in the cylinder 18 communicate with each other through the communication oil passage 22, so that the piston 21 can slide freely with respect to the cylinder 18. Yes, the front frame Ff is allowed to tilt. When the shut-off valve 23 is closed, the oil chambers 19 and 20 are closed.
Since the gap is shut off, the above-described sliding of the piston 21 is prevented, so that the tilting of the front frame Ff is also prevented.

The operation of the electromagnetic shut-off valve 23 is controlled by an electronic control unit 25. The electronic control unit 25 includes a brake input sensor 26 for detecting an input load B to the front brake Bf or the rear brake Br, a vehicle speed sensor 27 for detecting a speed V of the vehicle, and the first and second brakes.
Each output signal of the first and second oil pressure sensors 29 and 30 for detecting each oil pressure of the oil chambers 19 and 20 is input. The electronic control unit 25 sets the brake input B to a predetermined value B based on the output signals of the brake input sensor 26 and the vehicle speed sensor 27.
a (for example, an operation load 1 for the front or rear brake lever)
And the output of the vehicle speed sensor 27, that is, the vehicle speed V is a predetermined value Va (for example, a vehicle speed of 5 to 10 km / h).
Is determined to be less than or equal to).
And an operation signal to the indicator 30. But,
Even in such a case, based on the output signals of the first and second hydraulic pressure sensors 29 and 30, the pressure difference P between the two oil chambers 19 and 20 is maintained at a predetermined value P
When it is determined that it is equal to or more than a, the output of the operation signal to the shutoff valve 23 and the indicator 30 is prohibited, and at the same time, the operation signal is output to the engine output regulating device 31. The engine output restricting device 31 controls the increase of the output of the engine by thinning out the ignition signal of the engine or restricting the opening of the throttle valve of the carburetor by its operation.

Next, the operation of the first embodiment will be described.

During operation of the three-wheeled motor vehicle 1, the electronic control unit 25 first activates the brake input sensor 2 in a first step S1.
6. Vehicle speed sensor 27 and first and second oil pressure sensors 29, 3
Read each signal of 0. Next, in the second step S2, the vehicle speed V
Is smaller than or equal to a predetermined value Va, and if NO, the process proceeds to a fourth step S4.

If YES is determined in the second step S2, the process proceeds to a third step S3 to determine whether or not the brake input B is equal to or more than a predetermined value Ba. If NO, the process proceeds to a fourth step S4.

In a fourth step S4, the first and second oil chambers 1
It is determined whether or not the differential pressure P between 9 and 20 is equal to or greater than a predetermined value Pa,
If NO, the fifth step S5 and the eighth step S8
Then, the shutoff valve 23 and the indicator 30 are kept in an inoperative state.

Therefore, in such a state, the communication oil passage 2
2 is in a conductive state, and hydraulic oil can be exchanged between the first and second oil chambers 19 and 20. Therefore, as shown in FIG. The inside of the vehicle 1 can be freely slid and the vehicle 1 can easily turn.

When YES is determined in the third step S3, that is, when the vehicle speed V is equal to or lower than Va and the brake input B is
If it is equal to or more than a, the process proceeds to the sixth step S6 and the seventh step S7 in order to operate the shutoff valve 23, that is, to close it,
The closed state is displayed on the indicator 30. FIG. 5A shows changes in the vehicle speed V and the brake input B during this time.
As is apparent from this, the shut-off valve 23 is closed only when the vehicle is stopped or is sufficiently close to the stopped state even in the brake state, disconnects the communication oil passage 22, hydraulically locks the piston 21, and inhibits the tilting of the front frame Ff. Therefore, the front frame Ff can be made to stand on its own without any discomfort. At the same time, the indicator 30 displays the tilt-prohibited state of the front frame Ff.

If YES is determined in the fourth step S4, that is, if it is determined that the pressure difference P between the first and second oil chambers 19 and 20 is equal to or more than a predetermined value Pa, an eighth step S8 and a sixth step are performed. Proceeding to S6 and the seventh step S7 sequentially, the engine output restricting device 31, the shut-off valve 23, and the indicator 30 are operated to prohibit the tilting of the front frame Ff, and restrict the increase in engine output. Here, the fact that the differential pressure P between the first and second oil chambers 19 and 20 is equal to or greater than the predetermined value Pa means that the operator gives the front frame Ff an excessive tilting power to the right or left to the front frame Ff. At this time, by keeping the shut-off valve 23 closed, the front frame Ff
Can be prevented.

On the other hand, at the time of starting, the front frame Ff is kept independent by closing the shutoff valve 23 until the vehicle speed V exceeds the predetermined value Va or the brake input B falls below the predetermined value Ba. The opening of the valve 23 allows the front frame Ff to freely tilt (see FIG. 5B). Therefore, in this case, the front frame Ff can be freely selected between the independent state and the tiltable state by appropriately adjusting the brake input. The electronic control unit 25
The difference between the predetermined value Va or Ba when the vehicle speed V or the brake input B is increasing and when the braking input B is decreasing in order to provide hysteresis at the time of switching the operation and non-operation signals from the shut-off valve 23 to the shut-off valve 23. It is effective in preventing chattering.

FIG. 6 shows a second embodiment of the present invention.
Except that an electromagnetic friction brake 33 is provided around the tilt shaft 2 connecting the front frame Ff and the rear frame Fr, and the operation thereof is controlled by the electronic control unit 25, the same as in the previous embodiment. In the figure, the same reference numerals are given to the parts corresponding to those of the previous embodiment.

Thus, the friction brake 33 allows the front frame Ff to tilt when not in operation and allows the front frame Ff to stand on its own when activated. Parts corresponding to those in the previous embodiment are denoted by the same reference numerals.

The present invention is not limited to the above embodiment, and various design changes can be made without departing from the gist of the present invention. For example, the cylinder 18 is connected to the front frame Ff.
Alternatively, the piston 21 can be connected to each of the rear frames Fr.

[0028]

As described above, according to the first aspect of the present invention, when an input is made to the front brake for braking the front wheels or the rear brake for braking the rear wheels, the vehicle speed is equal to or less than a predetermined value. When, when the front or rear brakes were operated to stop the vehicle,
As long as the vehicle speed does not sufficiently decrease, the front frame can be tilted. Since the tilting is prohibited only after the vehicle speed has sufficiently decreased, the autonomous state can be obtained without a sense of incongruity.

According to a second feature of the present invention, the input to the brake is made when the brake input to the brake is equal to or greater than a predetermined value. An independent state and a tiltable state can be freely selected.

According to a third feature of the present invention, the tilt inhibiting means comprises a cylinder connected to one of the front frame and the rear frame, and a cylinder connected to the other of the cylinder and the first oil. A piston that slides in the cylinder in response to the tilt of the front frame, a communication oil path that connects the first and second oil chambers, and shuts off the communication oil path. A shut-off valve that can prevent the relative sliding of the piston, wherein the brake input is a predetermined value or more,
When the vehicle speed is equal to or lower than a predetermined value, the shut-off valve is operated.Thus, the control of the shut-off valve based on the vehicle speed and the brake input allows the front frame to be automatically self-sustained when the vehicle is stopped, and when the vehicle starts moving. The self-standing state and the tiltable state of the front frame can be freely selected.

According to a fourth feature of the present invention,
When the differential pressure between the first and second oil chambers is equal to or more than a predetermined value, the operation of the shut-off valve is prohibited, so that the operator applies unnecessary tilting power to the front frame at the time of starting or the like. In this case, it is possible to prevent the front frame from tilting sharply while keeping the front frame from being tilted.

Further, according to a fifth aspect of the present invention,
When the differential pressure between the first and second oil chambers is equal to or more than a predetermined value, the engine output restricting device is operated. Therefore, the operator applies unnecessary tilting power to the front frame at the time of starting or the like. In this case, an increase in the output of the engine can be restricted to prevent the vehicle from starting in an unnatural posture.

[Brief description of the drawings]

FIG. 1 is a side view of a motorcycle according to a first embodiment of the present invention.

FIG. 2 is a schematic rear view showing the self-standing device of the tricycle.

FIG. 3 is an explanatory view for tilting the front frame.

FIG. 4 is a flowchart for controlling tilting inhibition means;

FIG. 5 is a diagram showing a relationship between outputs of a vehicle speed sensor and a brake input sensor, and operation states of a tilt inhibiting means and an indicator.

FIG. 6 is a side view of a motorcycle according to a second embodiment of the present invention.

[Explanation of symbols]

 B Brake input Ba Predetermined value of brake input Bf Front brake Br Rear brake Ff Front frame Fr Rear frame P Differential pressure between first and second oil chambers Pa Predetermined value of the differential pressure V Vehicle speed Va Predetermined value of vehicle speed Wf Front wheel Wr Rear wheel 1 Motor tricycle 3 Tilt shaft 15 Tilt inhibiting means 18 Cylinder 19 First oil chamber 20 Second oil chamber 21 Piston 22 Communication passage 23 Shutoff valve 31 Engine output regulating device

Claims (5)

[Claims] 1. A rear frame (Fr) that supports a pair of left and right rear wheels (Wr), and is connected to the rear frame (Fr) so as to be tiltable in the left-right direction of the vehicle to support a single front wheel (Wf) so as to be steerable. Between the front frame (Ff) and the front frame (Ff)
In a self-standing device of a tricycle provided with a tilt prohibiting means (15) for prohibiting tilting of the vehicle, a front brake (Bf) for braking a front wheel (Wf) or a rear brake (Br) for braking a rear wheel (Wr). ), And when the vehicle speed (V) is equal to or lower than a predetermined value (Va), the tilt inhibiting means (15) is activated. 2. The brake system according to claim 1, wherein the input to the brake (Bf, Br) is performed when a brake input (B) to the brake is equal to or more than a predetermined value (Ba). A self-standing device for a tricycle. 3. The cylinder (1) according to claim 1, wherein the tilt inhibiting means (15) is connected to one of a front frame (Ff) and a rear frame (Fr).
8) and connected to the other of them and partitioning the inside of the cylinder (18) into a first oil chamber (19) and a second oil chamber (20), and the cylinder ( 18) a piston (21) that slides inside the first and second pistons;
A communication oil passage (22) connecting the oil chambers (19, 20);
A shutoff valve (23) capable of shutting off the communication oil passage (22) to prevent the relative sliding of the piston (21),
A three-wheeled motor vehicle characterized in that the shut-off valve (23) is activated when the brake input (B) is equal to or higher than a predetermined value (Ba) and the vehicle speed (V) is equal to or lower than a predetermined value (Va). Automatic self-standing device. 4. The shut-off valve (23) according to claim 3, wherein the differential pressure (P) between the first and second oil chambers (19, 20) is equal to or more than a predetermined value (Pa). An automatic self-standing device for a tricycle, characterized in that the device is prohibited. 5. The engine output regulating device according to claim 3, wherein the differential pressure between the first and second oil chambers is greater than a predetermined value. An automatic self-standing device for a tricycle, characterized in that: