JP2657464B2 - Linear floating disc brake caliper with feedback piston means for motorbikes etc. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the technical field of disc brakes for motorbikes and the like, and more particularly to a motorcycle rider who has complete control of a braking operation and avoids dangerous situations such as wheel locks during braking. It can be so,
The present invention relates to a disc brake caliper having a feedback action.

[0002]

2. Description of the Related Art At present, disc brake devices are widely used in motorcycles, which basically include three main parts, ie, a pump, a caliper, and a disc.

During braking, motorbike riders operate the pump through a hand lever conventionally used to brake the front wheel and a foot pedal used to brake the rear wheel. Generally, the force exerted by a bike rider on a lever or pedal presses on the brake fluid, which is a special incompressible fluid that has various necessary properties, such as its boiling point, moisture absorption, and metal corrosion properties. . The resulting pressure is used to press the brake friction material or pad against the disc, which rests firmly on the wheel and rotates with it.

In motorbike disc brake systems, calipers are known as a means for converting the hydraulic pressure conducted by the pump into braking force via a suitably designed hydraulic circuit containing the above-mentioned brake fluid. I have.

Conventionally, the caliper includes one or more single or opposing piston means which, when pressed by the pressure applied in the hydraulic circuit, apply pressure to the disk via the aforementioned pads. . The disc is the ultimate means of applying a corresponding braking force to the wheel, which is felt as a force generated between the tire and the road.

[0006] Usually, a pair of calipers and corresponding discs are mounted on both sides of a front wheel and operated by a common pump operated by a rider grasping a hand lever, and a single caliper and an associated disc are rear-mounted. It is mounted on a wheel and activated by a foot pedal.

Experience has shown that braking a motorcycle is a fairly complex and delicate process. Unlike cars, which have means to apply the applied braking force evenly to their four wheels, to brake the bike, the rider has to use a hand lever to brake the front wheel and a brake to brake the rear wheel. It is necessary to apply a braking action to the foot pedal at the same time. This behavior of the bike rider exerts a desirable but not necessary equal deceleration force on the front and rear wheels, which makes it difficult to brake safely and the success of braking depends on the skill and confidence of the rider. Very dependent.
Failure to do this can be very dangerous, especially if the opposite conditions are present, such as a worn tire and / or slippery road, etc., such as a low coefficient of friction between the motorcycle tire and the road. .

When a brake is applied, the braking force appears on the tires at the ground surface, but the inertia of the brakes attempts to maintain it as before and the movement acts above the ground surface through the center of gravity of the bike. .

[0009] The braking force applied to the ground surface necessarily involves a reaction force at the center of the wheel, the reaction force being a component of the weight applied to a particular wheel and the grip factor, ie the coefficient of friction between the tire and the road. Is the product of Thus, the braking force and its reaction force form a pair and apply a braking torque, which tends to stop the rotation of the wheel.

On the other hand, the inertial force of the motorcycle that tries to maintain the forward movement of the motorcycle is paired with the reaction force acting at the center of the wheel. This pair becomes the grip torque and tries to keep the wheel spinning.

As long as the grip torque is greater than the brake torque, the wheels rotate and the control of the motorcycle is maintained. As long as this condition is maintained, the rider will feel the overturning torque at the front end of the motorcycle trying to rotate the motorcycle forward. The rider is thrown forward with the bike,
As a result, the driver feels like diving the front wheel suspension. If the pressure on the front brake is further increased at this stage, one of two things can happen as a limiting condition: the front wheel locks and skids, or the front wheel continues to grip and the rear wheel Off is how the bike stands at its front end. Wheel locking is a condition where a dangerous condition occurs where the above-mentioned brake torque exceeds the grip torque when the brake pressure increases.

The rider can no longer change the course of the bike by turning the handlebar, since the bike is then moving autonomously on a straight course tangential to the course before the wheels lock. When the wheels actually lock, the rider simply feels the bike is unstable. At this stage, it is difficult to respond by reducing the force with which the rider squeezes the brake hand lever of the motorcycle and / or by depressing the brake foot pedal, but these can "unlock" the wheel.

[0013] Various wheel anti-lock systems have been invented to prevent difficulties in fulfillment. Basically, these prior art wheel antilock systems are based on a measurement of the rotational speed of the wheel, thereby allowing the wheel to interfere with the brake hydraulic circuit when trying to lock. However, these prior art wheel antilock systems are rather complex and are therefore expensive and sometimes unreliable due to their complexity. A further disadvantage for many riders of the prior art wheel anti-lock system is that they are operated independently of the rider, and the rider operates the wheel to prevent it from locking and / or unlocking. I'm still unaware of it.

[0014] It is therefore an object of the present invention to provide an anti-lock system in which operation is felt immediately and which is completely controllable by the rider of the motorcycle, thereby providing the disadvantages and disadvantages of the prior art motorcycle wheel anti-lock system. The point is to eliminate.

It is another object of the present invention to provide a new caliper design having a feedback effect,
This feedback effect is such that when braking is actually taking place on the ground, the feeling of braking can be transmitted to the rider's hands or feet, thereby preventing the rider from locking the wheels during braking. It is an action that allows you to exert all of your skills in a way.

[0016]

In a preferred embodiment of the invention, a disc brake caliper is used which can be split into two parts, the first of which is rigidly mounted on the brake suspension and the second of which is the first. The component of the caliper floating linearly between the compression springs on both sides of the component is further provided with a feedback piston, and the feedback piston is connected to the hydraulic circuit of the caliper and the rider passes through the hydraulic circuit. To transmit the sense of braking force applied to the ground surface to the brake hand lever or foot pedal.

With the linear floating caliper of the present invention, the rider can apply the braking action he has applied to the brake hand lever and / or foot pedal of the motorcycle to the maximum possible braking on the ground surface under certain driving conditions. It is continually known whether the force results and if it is damped for skidding or other reasons.

With the caliper of the present invention, the rider actually controls the braking action during braking, and unless he feels this and acts without responding, the difficult driving situations associated with wheel locking and / or diving. Has the further advantage of reducing or eliminating the need for riders to become familiar with the braking response of each particular bike. A very important reason for the frequent accidents on motorbikes is solved.

In addition, the caliper of the present invention acts to automatically correct incorrect operation by the rider of the motorcycle or to prevent the wheels from locking if the grip on the road tires is suddenly reduced. be able to.

A further advantage achieved by the disc brake caliper of the present invention is that in prior art motorcycles, the rider exerts a braking action on the front and rear wheels of the motorcycle, ie, the rider applies the brake hand lever or foot pedal. Although there was no means to adjust the brake hand lever and / or foot pedal to change the function correlated to the force and its associated movement to the actual braking force transmitted to the disc brake caliper, Adjusting the movement of the lever or foot pedal by increasing the force exerted on the brake disc by the force exerted on the lever or foot pad and the resulting pad by varying the compression of springs provided on both sides of the linear floating caliper; The caliper of the present invention Te, a Such means.

The configuration of the present invention and its embodiments will be listed below.

1. Disc brake caliper for a motorbike or the like, said caliper including a caliper housing (1), said caliper housing being inverted U-shaped, said inverted U-shaped having two parallel legs (1a, 1b). ) And a top side surface, a pair of projections having a hole (3) project from the inverted U-shaped top side surface (1c), and a pair of mounting bolts are used to mount the caliper housing (1) on a motorcycle suspension. Provided through said hole (3) for rigid mounting on the device, said caliper further comprising a linear floating caliper body (2) comprising a cylinder and piston means;
The piston means is provided with a pad, which, when a braking action is applied, the wheel (4) of the motorcycle.
0) and acts to apply friction to the rotatable disk (12), and the linear floating caliper body (2) is connected to the parallel leg (1) of the caliper housing (1).
a, 1b), and the flat side surfaces (2a, 2b) of the linear floating caliper body (2) are
2) and the rear compression springs (27a, b) connected therein so that the linear floating caliper body has a floating distance (x) in the rigidly mounted caliper housing (1). ), The caliper further comprises a rear guide pin (7) with an external threaded end (7a), said rear guide pin (7) being a plate (28).
Through the central opening (29), between the compression springs (27a, b) and through the opening (6) in the leg (1b) of the caliper housing (1). Entering the opening (6a) of the flat end (2b), the outer threaded end (7a) of the rear guide pin (7) has a corresponding inner side to adjust the compression of the rear compression spring (27a, b). Screwed into the threaded opening (6a), the caliper further comprises a front guide pin (5) with an external thread end (5a), the front guide pin (5) being the front compression spring (32). Through the opening (4) of the leg (1a) of the caliper housing (1) and into the cylindrical opening (4a) of the flat end (2a) of the linear floating caliper body (2). Bolt in the cylindrical piston (33) Are, thereby adjusting the compression of the front compression spring (32), wherein the flat end of the caliper is further the linear floating caliper body (2) (2
a) comprising feedback piston means (20) contained within said cylindrical opening (4a), said piston means (20) comprising a cylindrical piston (33) operating in said cylindrical opening (4a). The caliper further includes a hydraulic circuit, including the front guide pin (5), the hydraulic circuit including a hose (15) starting from a brake hand lever or a brake foot pedal, a pump, and master cylinder means. The hose is connected to the linear floating caliper body (2) and is divided into ducts for conveying brake fluid into each of the cylinder and piston means in the caliper cylinder, wherein the duct is then Converging, the duct (18) recovers to feed the brake fluid to said feedback cylinder and piston means (20). To start from the point, disc brake caliper, such as for motor bikes.

2. The linear floating caliper body (2)
The front compression spring (32) and the rear compression spring (27)
The torque (FRD), which is the product of the braking force (F) obtained by the combination of a and b) and the average disc radius RD,
As long as the torque (TRW), which is the product of the friction force (T) between the wheel and the road and the wheel radius (RW) of the motorcycle, is maintained within the caliper housing (1), The floating caliper body (2) is provided with the torque (F
2. The disc brake for a motorbike or the like according to claim 1, wherein when (RD) is equal to the torque (TRW), the forward movement causes the feedback piston means (20) to perform an expansion stroke. Caliper.

3. The front guide pin (5) and the rear guide pin (7) adjust the function of the hand lever or foot pedal of the motorcycle, the force applied by the rider on the brake hand lever or foot pedal and the resulting caliper pad. Adapted to function as a means for setting a desired fixed braking function relation with its movement relative to the braking force acting on the brake disc, said desired fixed braking function relation being established by the front guide pin (5). ) Is screwed into the internal threaded opening (32a) of the piston (33), thereby adjusting the depth defining the compression of the front compression spring (32), and allowing the rear guide pin (7) to move linearly. It is screwed into the internal thread opening (6a) of the rear flat end (2b) of the caliper body (2), The desired fixed braking function is selected by adjusting the depth which defines the compression of the rear compression springs (27a, b), the desired fixed braking function being associated with the linear floating caliper body (2) in the caliper housing (1). Corresponding to the stationary state, the brake function relationship changes as the linear floating caliper body (2) moves forward, and the expansion stroke of the feedback piston means (20) results in a forward compression spring (32).
Disc brake caliper for a motorbike or the like according to claim 1 or 2, which results in increased compression of the compression spring and reduced compression of the compression springs (27a, b).

4. A check valve assembly, wherein said check valve assembly disconnects said feedback piston assembly (20) from said hydraulic circuit and said linear floating caliper body (2) is actually forwardly moved. 3. The disc brake caliper for a motorbike or the like according to claim 1 or 2, further comprising a check valve used to prevent expansion of the feedback piston without moving.

[5] The check valve is mounted in a cylindrical opening (8a) of the caliper flat end (2a), the check valve having an end at the leg (1) of the caliper housing (1).
a) including an axial valve pin (34) in contact with the upper inside surface of said valve mounting screw (8).
Through the central opening (43a) of the valve, the check valve further comprises a central opening (43a) of the cylindrical flange (43) and a safety washer (41) rigidly mounted around the axial valve pin (34). ), A compression spring (40) and a cylindrical body (35), the cylindrical body (35) having a side opening (36) and a bottom opening (37) in which the valve ball (38) rests. And the valve ball (38).
Is pressed to a predetermined position by a spring (39), and the axial valve pin (34) is attached to the caliper housing (1).
The linear brake caliper body (2) is moved forward by the leg (1a), thereby providing the disc brake hydraulic circuit with fluid flowing through the valve body (35). When the feedback piston means (20) communicates with the side opening (36) to the duct (18), the valve ball (38) is pressed inward toward the feedback piston means (20), When the linear floating caliper body (2) moves rearward and stops so as to prevent communication with the hydraulic circuit of the feedback piston means (20), the shaft washer pin (34) causes the safety washer (4).
5. The disc brake caliper for a motorbike or the like according to claim 4, wherein the caliper returns by the action of the compression spring (40) which presses 1).

6. An adjustable spacer bolt (26) passing through an opening (26a) in the leg (1a) of the caliper housing (1) and in contact with the front flat end (2a) of the floating caliper body (2); 2. The adjustable spacer bolt (26) is used to adjust the floating distance (x) of the linear floating caliper body (2) within the rigidly mounted caliper housing (1). Disc brake caliper for the described motorbike etc.

7. The line passing through the front guide pin (5) and the rear guide pin (7) is the linear floating caliper body (2) in the caliper housing (1).
Of the front compression spring (32)
And the feedback piston assembly (20) and the rear compression springs (27a, b) are provided with two opposed pistons (9) of the linear floating caliper body (2).
The disc brake caliper for a motorbike or the like according to claim 1, wherein a line connecting the centers of a) and (10a) is bisected at right angles.

8. A line passing through the front guide pin (5) and the rear guide pin (5) defines the position of the linear floating caliper body (2) within the caliper housing (1), thereby the feedback piston assembly. (20) to define the position of the front compression spring (32), the rear compression springs (27a, b) being the two opposing pistons (9) of the linear floating caliper body (2).
The disc brake caliper for a motorbike or the like according to claim 1, which passes above a line connecting the centers of a) and (10a).

[0030] These and other objects, features and advantages of the present invention are described in detail below.

[0031]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments will be described below with reference to the accompanying drawings.

While prior art motorcycle disc brake calipers are formed from a single item of compact construction, the calipers of the present invention are shown to include two major items. That is, the caliper housing 1 is firmly mounted on the suspension device of the motorcycle, and the floating caliper body 2 is capable of performing linear reciprocating motion in the caliper housing 1 firmly mounted.

The floating caliper body 2 shown in the drawing comprises a device of two opposing pistons, indicated by 9a, 10a, each piston having a pad 9b, 10b in a corresponding cylinder 9, 10. Each is supported and located on the opposing surface. Motorbike disc 1
2 is inserted into the gap 11 between the pads 9b and 10b,
As a result, when the rider of the motorcycle applies braking force, pressure is applied to the disc by the pads 9b and 10b. The calipers of the present invention may of course be formed to include any desired number of single or opposed piston means.

The floating caliper body 2 is provided, for example, with lines 13 and 14 defining a dividing plane, as shown in the cross-sectional view of FIG.
Can be further subdivided, but this division is customary in prior art calipers and will not need to be analyzed further here. For the sake of simplicity, in all the calipers of the opposed piston type, the conventional bolts used to connect the two caliper pieces along the aforementioned dividing surfaces 13, 14 are not shown in the accompanying drawings.

The brake fluid is supplied from outside to the caliper hose 15 starting from the hand lever or foot pedal of the motorcycle.
Through the inside of the floating caliper body 2 substantially through the duct 1
It is supplied to the caliper through each of the opposing cylinders 9 and 10 of the opposing pistons 9a and 10a through the master cylinder of the pump of the device divided into 6 and 17.
Further, the hydraulic circuit of the caliper of the present invention extends to duct 18, thereby passing through valve assembly 19 and feedback piston means 20. The hose 15 terminates in a bolt and nut fitting 22, whereby the hose is connected into a correspondingly threaded opening 21 in the floating caliper body 2. An air relief valve 23 is provided at a suitable position on the floating caliper body 2 to remove any unwanted air from the hydraulic circuit.

According to the invention, the floating caliper body 2 is
At its right end, a feedback piston device 20 and a control valve assembly 19 are provided, which will be described analytically below.

The caliper housing 1 has an inverted U shape,
It is shown with a pair of projections having holes 3 projecting from the inverted U-shaped side surface 1c, through which mounting bolts pass to position the caliper on the suspension device of the motorcycle. Further, each of the U-shaped opposed legs 1a and 1b of the caliper housing 1 is provided with an opening 4 and 6, respectively, through which the guide pins 5 and 7 respectively pass, which will be described below. .

Further, a hole 26a is provided adjacent to the opening 4 of the inverted U-shaped leg 1a of the caliper housing 1, and the hole 26a is suitable for receiving the adjustment spacer bolt 26,
The bolts allow the distance between the leg 1a of the caliper housing 1 and the flat end 2a of the floating caliper body 2 described below to be adjusted.

An inverted U-shaped metal plate 24, which is bolted from outside with a pair of bolts (not shown) onto the leg 1a of the caliper housing 1, guides the guide pin 5 through the opening 4 in the caliper housing leg 1a. After being introduced through the cylindrical side opening 4a of the caliper body 2,
It is used as a means for locking the guide pin 5 in place and preventing its rotation.

The floating caliper body 2 has a shape similar to a V-shape as a whole, and flat ends 2a parallel to both sides thereof.
And its entire length, measured along a vertical line between the parallel flat ends 2a and 2b, is the caliper housing 1
The floating caliper body 2 can be introduced into the gap between the parallel legs 1a-1b. In practice, as shown in the cross-sectional view of the assembled caliper of FIG. 3, the flat end 2b of the floating caliper body 2 is shown in contact with the inner surface of the leg 1b of the caliper housing 1, while The flat end 2a of the caliper body 2 is shown at a distance x from the inner surface of the leg 1a of the caliper housing 1, this distance x defining the length by which the floating caliper body 2 can float within the caliper housing 1. doing. This distance x may be adjusted by means of an adjusting spacer bolt 26, which passes through an opening 26a in the leg 1a of the caliper housing.

At the flat end 2a of the floating caliper body 2,
Cylindrical openings 4a and 8a are provided, into which the feedback piston assembly 20 and the valve assembly 19 are fitted respectively. Flat end 2 of floating caliper body 2
The above-mentioned opening 4a of the caliper housing 1 corresponds to the opening 4 of the leg 1a of the caliper housing 1 when the flat end 2a of the floating caliper body 2 is placed near the flat surface of the leg 1a of the caliper housing 1 during the assembly of the caliper. They are arranged to match.

On the other hand, the flat end 2b of the floating caliper main body 2 is provided with the external threaded end 7 of the corresponding guide pin 7.
6a internally threaded to receive a therein
Is provided. The opening 6a in the flat end 2b of the floating caliper body 2 is adapted to allow the flat end 2b of the floating caliper body 2 to contact the flat surface of the leg 1b of the caliper housing 1 during the assembly of the caliper. With the opening 6 in FIG.

The mounting of the caliper of the present invention on the suspension device of the motorcycle may be carried out with the caliper in a linear floating direction, preferably tangential to any point around the brake disc 12 and horizontal and parallel to the ground. The mounting can be done in any inclination and orientation, as shown in FIG. 2, whereby the caliper end 1a of the caliper housing 1 and the flat end 2a of the floating caliper body 2 are connected to the front end of the caliper. It is considered that the caliper ends 1b and 2
b are each considered to be the rear end of the caliper.

At the rear end of the caliper, a pair of compression springs 27a, 27b are provided between the positioning rollers 28a, 28b of the metal plate 28 and the positioning rollers 25a, 25b on the outer surface of the leg 1b of the caliper housing 1. And assembled. The rear guide pin 7 passes through the central hole 29 of the metal plate 28 between the compression springs 27a and 27b, passes through the opening 6 of the leg 1b of the caliper housing 1 and opens at the flat end 2b of the caliper floating body 2. 6a. By screwing the threaded end 7a of the rear guide pin 7 into the internally threaded opening 6a, the spring 27
The compression of a, 27b can be adjusted. After the compression has been adjusted, the rear guide pin 7 is
It is fixed in place by a 0 and an associated screw 31.

At the front end of the caliper, assembly is performed by a front guide pin 5. As shown in FIG. 5, the guide pin 5 has a threaded end 5a, which is the cylindrical piston 3 of the feedback piston assembly 20.
3 is screwed into a correspondingly internally threaded central opening 33a. The feedback piston assembly 20 further includes a compression spring 32 in the side opening 4a of the caliper flat end 2a. The front guide pin 5 passes through the opening 4 in the leg 1 a of the caliper housing 1 through the compression spring 32 and into the opening 4 a in the flat end 2 a of the floating caliper body 2, where the pin is connected to the aforementioned central opening 33 a of the piston 33. It is screwed into and the depth at which the screw is made defines the desired compression of the compression spring 32.

According to the invention, the hydraulic circuit may be designed such that the piston cylinders 9 and 10 are in direct communication with the feedback cylinder 20, but the valve assembly 1
9 is preferably used, by means of which the feedback piston assembly 20 can be connected to or disconnected from the hydraulic circuit.

The valve assembly 19 provided in the side opening 8a of the flat end 2a of the floating caliper body 2 is a check valve, the purpose of which is to cut off the communication of the feedback piston assembly 20 with the hydraulic circuit, This prevents undesired expansion of the feedback piston without the linearly floating caliper body 2 actually moving forward. Accordingly, the hydraulic connection of the feedback piston assembly 20 is such that the floating caliper body 2 moves forward when the braking action is applied to the moving bike, and the axial valve pin 34 contacts the inner surface of the leg 1 a of the caliper housing 1. Only performed when compressed. This valve assembly is particularly recommended when applying the floating caliper of the present invention in heavy touring motorbikes.

As shown in the accompanying drawings 5 and 6, in accordance with a preferred illustrative embodiment of the present invention, the proposed check valve assembly 19 includes a central opening 34a for the valve mounting screw 8.
The above-described shaft-shaped valve pin 34 passing therethrough, the central opening 43a of the cylindrical flange 43, and the safety washer 4
1, a compression spring 40 and a cylindrical body 35. The cylindrical body 35 of the valve assembly has side openings 36 that direct the fluid contained in the hydraulic circuit to the feedback piston means.
And a bottom opening 37 on which the valve ball 38 is mounted. The valve ball 38 closes the bottom opening 37 of the cylindrical body 35 of the valve under the pressure of the hydraulic circuit applied through the duct 18, and the spring 39 opens the valve assembly opening 8a.
Located at the middle distal end, it depresses the valve ball 38 and returns quickly to close the bottom opening 37 unless the valve ball 38 is pressed by the axial valve pin 34. The axial valve pin 34 opens the valve ball 38 into the opening 8a.
When the forward movement of the floating caliper body and the expansion stroke of the feedback piston are initiated, fluid flows through valve body 35 and side opening 36 toward the feedback piston assembly. While the axial valve pin 34 returns by the action of the compression spring 40, which presses on the safety washer 41, which rests firmly around the axial valve pin 34. The liquid tight operation of the cylindrical valve body 35 is performed by an O-ring 42 rigidly mounted around it, while the liquid tight operation of the entire valve assembly is performed by the cylindrical flange 43 and the valve mounting screw 8. .

The following is a brief theoretical background useful for understanding the principles of caliper operation of the present invention. In FIG. 2, the wheel 40 of the motorcycle is shown with the radius RW in contact with the ground surface indicated by the numeral 41. A disk having an inner radius RD ₁ , an outer radius RD ₂ and an average radius RD is mounted on the wheel 40 and the caliper of the present invention is mounted such that its opposing piston pad contacts the disk during braking. The caliper is shown such that a friction force F between the disc and the pad and its reaction force F 'have acted, while a friction force T between the wheel and the road acts on the ground surface.

During braking, the braking torque that tries to stop the wheel from rotating is the product of the wheel radius RW and the frictional force T between the road and the wheel. This braking torque TRW
Is greater than or equal to the torque FRD, which is the product of the force F exerted on the brake disc by the caliper pads and the average disc radius RD, unless the wheel locks. Thus, FRD ≦ TRW, or in other words RDP2EμDP ≦ RWGμRW (where P is the pressure in the hydraulic circuit, E is the area of the caliper piston, (2E is for the caliper having two opposed pistons) ) G is the weight component on the wheel, μDP is the coefficient of friction between the disc and the caliper pad, and μRW is the coefficient of friction between the road and the wheel. Can be prevented.

From the above, it is clear that the rider of the motorcycle cannot know how close he is to the dangerous state of starting the wheel-locked state when the FRD equals TRW during braking. Therefore, an attempt is made to increase the pressure factor P by grasping the brake hand lever or pressing the foot pedal.

In the caliper of the present invention, if the rider of the motorcycle continues to increase the braking pressure, once the danger is reached that FRD is equal to TRW, the braking pressure is further increased by the caliper pad. The force F exerted on the disc is increased and this force is used to initiate the forward movement of the linear floating caliper body in the rigidly mounted caliper housing, the forward movement being the feedback piston means.
20 expansion strokes and consequently a pressure drop in the hydraulic circuit which is self-correcting and the above-mentioned desired state FRD≤TRW or RDP2EμDP≤RWGμ
It acts to maintain RW or even to automatically unlock momentarily locked wheels.

The rider of the motorcycle feels the pressure drop in the hydraulic circuit of the brake by feeling that the elasticity of the hand lever of the motorcycle has increased similarly to the hydraulic clutch of the motorcycle. A similar and similar elastic sensation is felt. At this point, the rider actually feels a change in the movement of the brake hand lever and / or foot pedal of the motorcycle,
These travel distances must be increased in order to be equivalent to before, and an incremental change in braking force occurs.

[0054] Suitable dimensions of the caliper piston 9a, 1 0a and feedback piston 33 can be determined from the following pressure equation, on the assumption that the equation brake fluid is an ideal non-compressible fluid is _{effective: P · 2 · μDPπ d 1} 2/4 = P · π · d 2 2/4 expression in d ₁ is the diameter of the caliper piston 9a or 1 0a, d ₂ is the diameter of the feedback piston 33 ,
From there,

[0055]

(Equation 1)

This means that ideally the diameter ratio d ₂ / d ₁ must be equal to twice the square root of the coefficient of friction between the brake disc and the caliper pad.
Given the above diameter relationship, equations are obtained for the force shown in FIG. 2 acting longitudinally on the caliper of the present invention, namely the frictional force F between the disc and the pad and its reaction force F '. However, in the caliper of the present invention uses a feedback piston of smaller diameter, the spring 3 2 pairwise spring 2 7a, 2 7b and feedback piston assembly 2 0 calipers rear end frictional force F and its It is preferable to maintain the balance of the reaction force F '. Therefore, in this case, the ratio a = F ′ / F , hereinafter referred to as the brake ratio. If this is not 1 , the diameter ratio becomes

[0057]

(Equation 2)

Is as follows. Therefore, as an example, the brake ratio a = 4
If it is, this is F = F '/ 4, i.e. the force acting on the floating caliper of the present invention is divided, 75% of the force is absorbed by the spring 2 7a, 2 7b caliper rear end, the rest of the force 2 5% is absorbed by the feedback piston assembly 2 0 and the spring 3 2.

From the above principle of operation of the disc brake caliper of the present invention, a new braking method for a motorcycle is established, whereby the rider himself can completely control the braking process and brake in a safe manner. it is obvious. Brake hand lever and / or by rider
Or a first function is established by correlating the force exerted on the foot pedal and the resulting movement with the braking force (F) transmitted to the disc brake caliper of the present invention;
On the other hand, as a result of the pressure drop due to the inflation stroke of the feedback piston means, the force exerted by the rider on the brake hand lever and / or the foot pedal and the resulting movement to the braking force (F) transmitted to the disc brake caliper of the invention It is understood that the correlation establishes a second function. This second function is the same force (F) on the disc brake caliper.
Differs from the first function in that greater force and resulting movement must be applied to the brake hand lever and / or foot pedal to produce To become aware of this change in conduction function, the rider knows that he must stop further depressing the brake hand lever and depressing the brake foot pedal to avoid the dangerous consequences of wheel lock . Thus, the rider can reduce the force on the brake hand lever and / or the foot pedal, thus restoring the above-described transmission function, where the FRD is less than TRW and wheel lock is prevented. . Desired constant conduction function that is constant braking function relationship is screwing the front and rear guide pins 5 and 7 above, whereby front and rear compression spring 3 2 and 2
Note that it is easily preselected by adjusting the compression of each of 7a, b.

The theoretical schematic diagram of FIG. 1 shows the basic components of the caliper according to the invention, namely the opposing piston cylinders 9 and 10 which are located coaxially along the longitudinal axis aa ′, the rear of the caliper. Feedback piston assembly 2 comprises a guide pin 5 of the front end portion of the pairwise spring 2 7a, 2 7b and caliper comprising an intermediate guide pins 7 end
0 is located along a longitudinal axis bb ′ passing through the opposing guide pins 5 and 7, the axis bb ′ being perpendicular to the axis aa ′ in the middle of the distance between the opposing ends of the opposing cylinders 9 and 10. Intersect.

However, a practical reason related to the need to obtain a shorter length caliper is that the feedback piston assembly 20 and / or the rear spring of the caliper and the guide pin in-between are positioned vertically in an elevated position. This is simply an ideal theoretical state, because it needs to be located.

As shown in FIG. 1 , in this ideal theoretical state, the two forces F and F ′ are equal to the longitudinal axis bb ′.
Acting between the two opposing cylinders 9 and 10 along the axis bb 'intersects the longitudinal axis aa' at this point.
At this point, the force F includes two components F 1 and F 2 acting respectively on the rear compression spring, the front compression spring and the feedback piston, the reaction force F ′ of which is corresponding but opposite to F 1 and F 2. It includes two corresponding components F 1 ′ and F 2 ′ acting in the direction.

In practice, the actual relationship between the forces F and F ′, and thus the respective relationships between the component forces F 1 , F 2 and F 1 ′, F 2 ′, is determined by selecting the brake ratio “a”. is a decision that, the brake ratio "a" also defines the relationship between the diameter d ₁ and a feedback piston d ₂ of the caliper piston, which limits as well as the desired expansion stroke of the feedback piston can be handled by the brake pump Consider the caliper floating distance "x" obtained as follows. All design considerations relating to the motorbike, that is, whether it is designed as a racing or touring bike, or the wheel diameter selected etc. also influence the choice of the above parameters of the caliper of the invention.

Although the invention has been described with reference to embodiments, it should be noted that the embodiments are illustrative only and not limiting. Other embodiments with modified forms, sizes, materials and accessories used are proposed without departing from the scope and purpose of the invention.

[Brief description of the drawings]

FIG. 1 is a schematic diagram theoretically showing the basic components of a caliper of the present invention and the associated forces.

FIG. 2 is a front view of a wheel of a motorbike on which the caliper of the present invention is mounted.

FIG. 3 is a cross-sectional view of the caliper of the present invention in an assembled operating state.

FIG. 4 is a perspective view of the caliper of the present invention divided into a fixed part and a movable part.

FIG. 5 is an exploded perspective view of the caliper of the present invention disassembled into two parts and various accessories.

FIG. 6 is a cross-sectional view of a one-way valve used to disconnect communication of the feedback cylinder of the caliper of the present invention from the hydraulic circuit.

Claims (1)

(57) [Claims] 1. A disc brake caliper for a motorbike or the like, said caliper including a caliper housing (1), said caliper housing being inverted U-shaped, said inverted U-shaped being two parallels. Legs (1
a, 1b) and a top side surface, a pair of projections provided with a hole (3) protrude from the inverted U-shaped top side surface (1c), and a pair of mounting bolts are mounted on the caliper housing (1).
Is provided through the hole (3) for firm mounting on the suspension device of the motorcycle, the caliper further including a linear floating caliper body (2) including a cylinder and piston means, the piston means having a pad. The pad acts to frictionally contact the wheel (40) of the motorcycle when the braking action is applied, thereby acting to apply friction to the rotatable disk (12), and the linear floating caliper body is provided. (2) is inserted between the parallel legs (1a, 1b) of the caliper housing (1), and the flat side surface (2) of the linear floating caliper main body (2).
a, 2b) are the front compression spring (32) and the rear compression spring (2).
7a, b) and connected therein.
The linear floating caliper body freely reciprocates linearly between floating distances (x) in the rigidly mounted caliper housing (1), the caliper further comprising an external threaded end (7a). A rear guide pin (7), which is located in the central opening (29) of the plate (28), between the compression springs (27a, b) and the legs of the caliper housing (1). (1b) through the opening (6), into the opening (6a) of the flat end (2b) of the linear caliper body (2), and into the external threaded end (7a) of the rear guide pin (7). ) Are screwed into correspondingly internally threaded openings (6a) to adjust the compression of the rear compression springs (27a, b), the caliper further comprising a front guide with an external threaded end (5a). Including a pin (5), said front Idopin (5)
Passes through the front compression spring (32), through the opening (4) of the leg (1a) of the caliper housing (1) and through the cylinder of the flat end (2a) of the linear floating caliper body (2). Cylindrical piston (3) operating in the opening (4a)
3) bolting into it, thereby adjusting the compression of said front compression spring (32), said caliper further comprising said cylindrical opening (2a) in said flat end (2a) of said linear floating caliper body (2). 4a) including feedback piston means (20) contained within;
The piston means (20) includes the front guide pin (5) with a cylindrical piston (33) operating in the cylindrical opening (4a); the caliper further includes a hydraulic circuit; Comprises a hose (15) starting from a brake hand lever or a brake foot pedal, a pump and master cylinder means, said hose being connected to said linear floating caliper body (2), in which the caliper cylinder Is divided into ducts for carrying brake fluid into each of said cylinders and piston means, said ducts then converging, and duct (18) carries brake fluid to said feedback cylinder and piston means (20). Disc brake caliper for motorbikes etc., starting from its convergence point.