| JPS60168927 | PEELING OF BRAKESHOE LINING |
| FR1340925A | 1963-10-25 | |||
| GB488382A | 1938-07-06 | |||
| US1890425A | 1932-12-06 | |||
| US2150186A | 1939-03-14 | |||
| GB2125125A | 1984-02-29 | |||
| GB1025881A | 1966-04-14 |
| 1. | A Grooved Brake Shoe for automotives with better braking performance and typically characterized by groove on lining surface contacting with braking media and represented in various designs, groove sizes and groove distance depending on the size of the break shoes. |
| 2. | A Grooved Brake Shoe under claim 1, for motorbikes and or other automotives with arc lining radius ranging from 25 to 100 mm, cone shappe, width ranging from 1 to 3 mm and groove distance ranging from 1 to 3 cm. |
| 3. | A Grooved Brake Shoe under claim 1, for automotives with with arc lining radius ranging from 80 to 150 mm, cone shape, width ranging from 1 to 5 mm and groove distance ranging from 2 to 5 cm. |
| 4. | A Groove Brake Shoe under claim 1, for automotives with arc lining radius ranging from 150 to 200 mm, cone shape, width ranging from 1 to 5 mm and groove distance ranging from 2 to 7 cm. |
| 5. | A Groove Brake Shoe under claim 1, for automotives with arc lining radius of more than 200 mm, cone shape, width ranging from 2 to 6 mm and groove distance ranging from 2 to 9 cm. |
| 6. | A Groove Brake Shoe under claim 1, for motorbikes and or other automotives mentioned in claim 2 until claim 5 with variations in designs, i.e. arc, skew, straight, cross, lambda, cone line and or combination of two or more of the aformentioned grooves. |
| 7. | A Grooved Brake Shoe for tracktors agricultural machinery with better braking performance and typically characterized by groove on lining surface contacting with braking media and represented in various designs, groove sizes and groove distance depending on the size of the break shoe and variation of designs and or combination of designs under claim 6. |
| 8. | A Brake Pad for automotives with better braking surface of the brake pad contacting with braking media and represented in groove sizes and groove distance depending on the size of the break pad and variation of designs and or combination of designs under claim 6. |
| 9. | Methode of manufacturing grooved brake shoes, i.e.: directly manufactured by means of printers, and or grooving smooth brake shoes by means of grooving aids. AMENDED CLAIMS [received by the International Bureau on 4 September 1998 (04.09.98); original claims 19 replaced by amended claims 14 (1 page)] 1. A shoe for drum brake with better braking performance and typically characterized in that a plurality parallel V grooves (Fig. la) on surface of lining. |
| 10. | 2 A brake shoe under claim 1, wherein the grooves depth is equal to about 3/4 of the lining thickness. |
| 11. | 3 A brake shoe under claim 1, wherein the distance of sequential V grooves is equal ot or less than 20 mm. |
| 12. | 4 A brake shoe for drum brake with better braking performance and typically characterized in that a cone shape (Fig. 2) on surface of lining, with depth of the groove is equal to 3/4 of the lining thickness. |
Backaround Art Nowadays automotive engine capacities are getting greater, Consequently, it improves the automotive speed and acceleration tremendously. To secure the passangers safety and comfort, a good brake system must present.
The are a number of automotive brake systems, namely: mechanical system with brake shoe and disc brake.
Currently there are frequently a lot of complaints regarding the brake shoe and disc brake due to their unsatisfactory performance. The surface lining of present brake shoes in automotives, such as : motobikes, cars, trucks and buses directly contacts with smooth brake shoes.
It is further innovated by grooving the lining surface of the brake shoes.
The purpose of grooving is improve braking performance of the shoes. The grooved brake shoes are further called Grooved Brake Shoes.
Disclosure of Invention One of the most important part of automotives is a brake system, while one of the the most essential components of the brake system is a brake shoe. Generally the brake shoes is smooth and ungrooved. Unfortunately, it is often found that the performance of this type of brake shoes is not satisfactory. It will be typically worse during wet season.
To improve the braking performance, it is innovated by grooving the lining surface of the brake shoe. The grooving
designs as represented in Picture (1) and Picture (2) can be cone or stack, or in other variations as presented in Picture (4) to Picture (9). The grooving design varies, it can be a combination of two or more designs presented in those pictures. Picture (3) representing ungrooved brake shoe for motorbikes and Picture (10) representing ungrooved brake shoe for small cars are employed as a comparison.
This ungrooved brake shoe is also applicable to cars, trucks, buses etc., as principally the braking system is the same, as it simply differs in the size of the brake shoe.
To show the superiority of a grooved brake shoe, a testing on rubbing coefficient of the grooved brake shoe must be conducted by means of testing equipment represented in Picture (11). The research shows that current is directly correlated with braking performance parameters with fixed load, rotation and motor tension. If the identified current is high and vice versa. The tested brake shoes are the cone grooved one, see Picture (1), and the ungrooved one, see Picture (3). The load is 3,06 kgs and the testing time for each brake shoes is 2 minutes.
The result of the test is represented in table (1) showing that the identified current on grooved brake shoe is greater than the one on ungrooved brake shoe. It shows that the grooved brake shoe performs better braking performance than the ungrooved brake shoe performs better braking performance than the ungrooved one does.
TABLE 1 RESULT OF BRAKE SHOE TEST Initial Conditions Tension V0 = 380 Volt Current 1e = 1.4 Amp
Motor Rotation n1 = 1.500 rpm Wheel Rotation n2 = 600 rpm Load w = 3.06 kg Groove Distance d = 2 cm No. BRAKE SHOES TESTED CURRENT(I1) 1 2 3 Average 1 Ungrooved Brake shoe 2.2 2.2 2.2 2.2 Amp 2 Grooved Brake Shoe 2.5 2.7 2.7 2.6 Amp Brief Description of Drawings The attached pictures illustrate some variations of grooving designs. Picture (1) illustrates cone grooved brake shoes. Picture (la) shows upper view of the cone grooved brake shoes. Picture (lib) shows side view of the cone grooved brake shoes. Picture (la) shows lower view of the cone grooved brake shoes. Picture (2) shows upper view of the cone grooved brake shoes.
The variations of grooving are represented in picture (4) to Picture (9). Picture (9) shows the upper view of are grooved brake shoes. Picture (5) shows the upper view of skew grooved brake shoes. Picture (6) shows the upper view of straight grooved brake shoes. Picture (7) shows the upper view of cross grooved brake shoes. Picture (8) shows the upper view of lambda grooved brake shoes. Picture (9) shows the upper view of cone grooved brake shoes.
Picture (3) representing ungrooved brake shoes is presented as a comparison. Picture (3a) shows the upper view of ungrooved shoes. Picture (3b) shows the side view of ungrooved shoes. Picture (3c) shows the lower view of ungrooved shoes. Picture (1) and Picture (3) represent motorbike brake shoes. However, principally the grooving system is applicable to other kinds of vehicles, such as
cars, trucks, buses etc. Picture (10) shows the ungrooved brake shoes for small cars. Picture (10a) shows the upper view of ungrooved brake shoes for small cars. Picture (10b) shows the side view of ungrooved brake shoes for small cars. Picture (10c) shows the upper view of ungrooved brake shoes for small cars.
Picture (11) shows the equipment for testing the braking performance. The equipment consists of (a) Electromotor, (b) Transmission Chains, (c) Brake Load, (d) Supporting Profile, (e) Brake Lever, (f) Wheel and Spokes, (g) Gear, and (h) Testing Pad. Picture (lea) shows the upper view of testing equipment. Picture (lib) shows the front view of testing equipment. Picture (ill) shows the side view of testing equipment.
Best Mode for Carrying Out the Invention This invention is intended to improve automotive braking performance without changing the braking system at all. The foundamental change is merely on grooving the lining surface of the brake shoes that are generally smooth. It is for maintaining dynamic rubbing coeficient of the brake shoes.
The function of grooving are to eleminate dust and provide air passange in order to maintain the temperature of the brake shoes, prevent over heating and current water when the brake shoes are submerged in floods smoothtly so that the contact between the lining surface and brakeing media becomes perfect and prevents skid.