Reaction deam disc brake with sliding pins for vehicles

A reaction beam disc brake with sliding pins is provided for vehicles, wherein the disc brake eliminates the residual torque, and sensibly reduces the manufacturing stages. The compression effort of the pads on the disc occurs at the piston central line and at the same plane of the sliding and reaction pins. The disc brake includes a piston (1), a removable inner pad (3), a beam shape outer pad (4), two sliding pins (5), a carrier (2) and four springs to move away the pads (3)(4), which are mounted on the sliding pins (5).

BACKGROUND OF THE INVENTION 
The present report deals with the detailed description accompanied of 
elucidative drawings of an advanced disc brake for automobile vehicle, 
mainly small vehicles. For its unusual and novel special configuration, 
the disc brake of the present invention is an extremely efficient and 
economic assembly whose simplicity of manufacturing results in easy 
installation and maintenance. 
SUMMARY OF THE INVENTION 
The brake disc herein described basically consists of a piston housing, a 
reaction carrier with central bracket brake pads and sliding pins, as any 
disc brake commercially available. 
What is innovative in the present invention is that its special 
configuration provides for the compression effort of the pas on the disc 
to occur in the piston central line, and in the same plane of the sliding 
and reaction pins, so that the braking force is equally and evenly 
distributed between the two brackets of the pads' carrier at the central 
area, and is symmetrically distributed onto the sliding pins. 
That is, the whole action and reaction force of the brake acts on the same 
plane, which is the brake medium plane, comprising the piston and the 
sliding pin central line, and the tangent resultant from the braking, 
which acts on the radial center of the breaking path, where the braking 
tangential resulting from the disc pads' compression effort is 
symmetrically loaded on the sliding pins by the inner and outer pads. 
OBJECTS OF THE INVENTION 
Such a disc brake of the present invention is specially developed for 
aiming at the simplification of the productive process, having easily 
adaptable parts to improve the vehicle versatility. The disc brake of the 
present invention also reduces the problems created by residual torque, as 
in the conventional existing disc brake projects; wherein the calipers 
have problems of force distribution, which require a more robust 
structure, and therefore, many stages of manufacturing, leading to 
increased cost. The same displacement causes noise and considerable 
residual torque due to the incorporation of elements to eliminate such 
noise. 
This new disc brake, with its novel physical and mechanical conception and 
its special configuration, has several advantages, such as the 
considerable increase of the material area of the pad friction, and 
reduction and simplification of the number of manufacturing stages. Thus 
becoming less costly, it reduces the number of parts and components due to 
its simple configuration. 
Its lightness provides for flexibility of dimensions and the use of 
alternative materials. It also provides for the variation of the piston 
diameter at a range of dimension up to 57 mm. It may be used to function 
with ventilated discs and or for solid discs without altering the main 
project. 
For the flexible constructive variation the system can easily house the 
parking brake mechanism and the carrier bracket and the sliding system of 
the pads reduces the noise to zero. The compression ring acting on the 
pads reduces the residual torque to zero. The sealed sliding pins reduce 
the sliding force, and the pins put into a single plane any efforts and 
reactions which reduce deflections and contribute to avoid residual 
torque, to increase the pads' useful life and to contribute to reduce the 
vehicle fuel consumption. 
All braking efforts of the disc brake of the present invention are always 
equally distributed between the two sides of the brake bracket and allow a 
more light construction, which can be less reinforced and structured.

DETAILED DESCRIPTION OF THE DRAWINGS 
The brake disc with reaction at the sliding pin includes: 
A piston housing accompanying shape of a beam (1) in the flexion line, 
wherein the piston housing is made of cast iron or aluminum alloy, and a 
carrier which retained at the automobile axle with arms which form the 
central support (2), preferably in cast iron. 
A removable inner pad (3), of molded friction material, is riveted or 
molded to a first pressed plate (3a) supported by sliding pins (5) on both 
sides, where the plate is obtained by conventional pressing, as there is 
no need of a fine blank finish, where the plate support area is provided 
through a hole 14 for the sliding pin (5). 
An inner pad (4) has a support plate (4a) in beam shape (4a) and inner pad 
(4) accompanies the flexion line in cast iron, with a friction material 
molded in a conventional process, which is glued or riveted where the pad 
plate (4a) is a structural part, replacing a part of the main body, so 
that the support plate (4a) and the pad (4) form a single part bolted to 
the sliding pins, eliminating in this way, the bridge and the fingers of 
the conventional disc brake. 
Two sliding pins (5) have the function of transferring the compression 
effort and of transmitting the braking effort, and also to permit the 
sliding and distribution of compression and braking efforts equally and 
symmetrically. Sliding pins (5) are supported on rubber shims mounted on 
the brake carrier, to avoid noise occurrence when the brake is subject to 
vibration in the off position. 
The disc brake of the present invention also includes a piston (6), a boot 
(7) a seal (8), a boot (9) for protection of the sliding pins (12), pad 
return springs (10) and a bleeder (11). A lubricated bearing (12) isolates 
the carrier pin, to avoid noise, and supports the weight of the body when 
the brake is in the off position. 
The functioning of the brake assembly as described herein, occurs as 
following: 
The hydraulic fluid pressure generated in the vehicle's master cylinder is 
transmitted to the disc brake, which is installed in the vehicle wheel, 
and the pressure enters through the input feeding hole (13), in the piston 
housing, which exerts pressure on the piston area (6), transforming it 
into mechanic force, which is discharged on the inner pad (3), which in 
turn actuates on the brake disc, and at the same time such pressure exerts 
force on the piston housing (1) transmitted to the outer pad (4), through 
the sliding pins (5) that discharges the effort on the brake disc opposite 
path. 
With the fixed bracket (2), the inner pad (3) is moved by the piston (6) 
and through the pins (5), through the moving of the body or housing (1), 
the outer pad is moved (4), thus compressing the disc; that occurs 
simultaneously. 
The compression force (normal of the disc) is applied to the radial center 
of the disc braking path, which originates the braking force (tangential 
to the disc) of such force, which force is generated in the center line 
and at the same plane of the sliding pin (5) which is also the same plane 
of the normal force or compression force, thus eliminating the deflection 
moments occurring in the conventional brake. 
The tangential braking force being transmitted to the carrier (2) central 
area is by the sliding pins (5), and simultaneously to both pins (5), 
equally dividing the efforts in relation to central line, independently of 
the pad wear condition. 
The beam shape of the housing (1) and the outer pad (4) accompanies the 
flexion lines to uniform the loading of the pad along its length, 
providing for uniform wear of the friction material. 
The pad return (3, 4) is provided by the spring action (10) assembled 
between the carrier (2) central area and the plates (3a), (4a) of pads (3, 
4) and is placed on the sliding pins (5), thus minimizing the residual 
torque caused by the braking. 
The configuration of this assembly of the disc brake simplifies the 
manufacturing of the disc brake, sensibly reducing the number of stages. 
The piston housing (1) is not provided with either a bridge or pads 
brackets, therefore eliminating any milling operation. 
The carrier (2) does not have a pads' bracket fingers, eliminating both 
broaching and milling of the disc passage area. 
The piston housing (1) is machined on two axles only, making the operation 
of the machine extremely simple. 
The fluid input port (13) and the fluid bleeder port (11) are symmetrically 
and identical located, thus eliminating the existence of a left or right 
hand machined part, as it can be turned on a lathe. 
The pad plates (3a), (4a) for the pads (3), (4) and the carrier (2) are 
machined in one axle only; it can be made at a multispindle drilling 
machine. 
The outer pad (4) is pressed in the conventional press and requires only 
drilling and threading. 
The inner pad (3) is pressed in the conventional process and it has only 
one drilling. 
In this way the specific project with special configuration of this disc 
brake with a reduced number of parts facilitates the assembling, 
maintenance and manufacturing operation, of the disc brake thus avoiding 
dimensional problems from simple manufacturing operations, as in the 
functioning, and residual torque, which causes several problems in the 
conventional disc brakes. 
Therefore, owing to its novel features of innovation, functionability, 
practicability and easy manufacturing, assembling and maintenance, ability 
to meet the current requirements and trends of the automobile industry in 
the area of disc brakes with reaction at the sliding pins for automobile 
vehicles as herein described, the present invention provides a novel disc 
brake which achieves unexpected results of uniform application of force, 
thus providing for a reduced and uniform wear of the disc brake and pad 
material. 
Other modifications may be made to the present invention, without departing 
from the spirit and scope of the present invention, as noted in the 
appended claims.