Fluid-pressure and analogous brake systems – Multiple fluid-receiving devices – Multiple motors
Reexamination Certificate
2000-03-17
2002-06-25
Dickson, Paul N. (Department: 3613)
Fluid-pressure and analogous brake systems
Multiple fluid-receiving devices
Multiple motors
C303S137000
Reexamination Certificate
active
06409285
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a front wheel and rear wheel interlocking brake system for a motorcycle, which allows interlocking brake operation between front and rear wheel brakes.
2. Description of Background Art
The brake operation of a motorcycle is performed by a brake lever provided on a handle grip and a brake pedal provided on a step, and a front wheel brake and a rear wheel brake are operated independently or simultaneously as needed by operation of the brake lever and the brake pedal as the brake operating means.
For example, Japanese Patent Laid-open No. Hei 7-196068 discloses an example in which electronic control is partially utilized for brake operation. A braking line of this example is shown in FIG.
10
.
A front wheel brake
02
and a rear wheel brake
05
are each configured as a hydraulic brake, and a lever master cylinder
07
is provided on a brake lever
06
as an operating means and a pedal master cylinder
012
is provided on a brake pedal
011
as an operating means.
A lever hydraulic pressure line
08
extending from the lever master cylinder
07
is connected to the front wheel brake
02
, and a pedal hydraulic pressure line
013
extending from the pedal master cylinder
012
is connected to one port of the threeport type rear wheel brake
05
. A hydraulic pressure circuit
014
branched from the pedal hydraulic pressure line
013
is connected to a secondary master cylinder
010
, and the output side of the secondary master cylinder
010
is connected to the other twoports of the rear wheel brake
05
via a control valve
016
.
On the other hand, the braking line includes an electronic control braking line in which a brake switch
040
opened and closed on the basis of the presence and absence of the turning motion of the brake lever
06
is provided on the brake lever
06
and a pressure sensor
041
for detecting a hydraulic pressure is provided on the lever hydraulic pressure line
08
, wherein the control unit
031
determines a hydraulic pressure to be generated in the secondary master cylinder
010
on the basis of detection signals from the brake switch
040
and the pressure sensor
041
, and operates an actuator
033
via a relay
032
to generate a hydraulic pressure in the secondary master cylinder
010
.
In the case of single operation of the brake pedal
011
, only the rear wheel
05
side is operated irrespective of the front wheel side.
In the case of single operation of the brake lever
06
or simultaneous operation of the brake lever
06
and the brake pedal
011
, a hydraulic pressure of the lever master cylinder
07
operates the front wheel brake
02
, and simultaneously, the actuator
033
is operated on the basis of the hydraulic pressure of the lever hydraulic pressure line
08
to generate a specific hydraulic pressure in the secondary master cylinder
010
, thereby interlocking the rear wheel brake
05
by the control valve
016
.
Since the secondary master cylinder
010
receives the hydraulic pressure of the electronic control brake system caused by operation of the brake lever
06
and the hydraulic pressure of the pedal hydraulic pressure line
013
caused by operation of the brake pedal
011
, the output from the secondary master cylinder
010
becomes higher. Accordingly, during a period in which one of the above-described two kinds of hydraulic pressures are inputted in the secondary master cylinder
010
, the other one cannot be additionally inputted in the secondary master cylinder
010
.
When the brake pedal
011
is singly operated, only the rear wheel brake
05
is operated, that is, the front wheel brake
02
cannot be operated to interlock with the rear wheel brake
05
irrespective of the running state of the motorcycle, with a result that it is impossible to perform brake control based on an ideal braking force distribution characteristic.
To be more specific, when the brake pedal
011
is singly operated, it is impossible to suitably switch the brake control between single brake control and interlocking brake control on the basis of the hydraulic pressure of the hydraulic pressure line or information on running state of the motorcycle, and also it is impossible to change the distribution characteristic of braking forces of the front and rear wheels on the basis of the running state.
The above-described prior art brake system has another problem. Since the pedal hydraulic pressure line
013
is branched on the way into the lines connected to the rear wheel brake
05
and the secondary master cylinder
010
and also the control valve
016
is disposed between the secondary master cylinder
010
and the rear wheel brake
05
, the number of parts is larger and the structure is complicated, and further the piping work and maintenance work become cumbersome.
A further problem of the prior art brake system is that the piping layout is limited by the above complicated structure, to reduce the degree of freedom in the piping layout.
SUMMARY AND OBJECTS OF THE INVENTION
In view of the foregoing, the present invention has been made, and an object of the present invention is to provide a front wheel and rear wheel interlocking brake system having a simple structure, which is capable of automatically performing brake control of the front and rear wheels on the basis of the running state of the motorcycle.
To achieve the above object, there is provided a front wheel and rear wheel interlocking brake system for a motorcycle in which a front wheel brake and a rear wheel brake, each being hydraulically operated, are provided on a front wheel and a rear wheel, respectively. The brake system includes a front wheel side actuator for applying a hydraulic pressure to the front wheel brake. A rear wheel side actuator is provided for applying a hydraulic pressure to the rear wheel brake. First and second brake operating means are operated by a driver. First and second operated amount detecting means are provided for detecting operated amounts of the first and second brake operating means, respectively. A control means is provided for receiving and calculating each of operated amounts detected by the first and second operated amount detecting means, and outputting drive control signals to the front wheel side actuator and the rear wheel side actuator on the basis of the calculated result. The control means performs brake control in such a manner that single brake control for singly driving either the front wheel brake or the rear wheel brake and interlocking brake control for driving the front and rear wheel brakes in accordance with a specific braking force distribution characteristic are switched from each other on the basis of the operated amounts detected by the first and second operated amount detecting means.
Since the brake control is performed in such a manner that single brake control and interlocking brake control in accordance with a specific braking force distribution characteristic are switched from each other on the basis of the detected operated amounts, it is possible to automatically perform brake control of the front wheel and rear wheel on the basis of the running state of the motorcycle due to the brake operation.
Since the brake system has a simple structure in which the front wheel side actuator for operating the front wheel brake and the rear wheel side actuator for operating the rear wheel brake are driven by the control means, it is possible to easily perform the piping work and maintenance work and to increase the degree of freedom in piping layout.
According to the present invention, the control means performs brake control in such a manner that when either of the first and second brake operating means is operated, the single brake control is performed until the detected operated amount reaches a specific value, and if the detected operated amount exceeds the specific value, the single brake control is switched into the interlocking brake control.
Even when either of the first and second brake operating means is operated, if the detected operated a
Tani Kazuhiko
Wakabayashi Takeshi
Dickson Paul N.
Honda Giken Kogyo Kabushiki Kaisha
Nguyen Xuan Lan
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