KR19990025460U - 4-wheel brake parking brake system by dual clevis - Google Patents

Abstract

In the vehicle brake system 1, the branch of the pedal 3 side of the clevis 31 mounted between the brake pedal 3 and the brake booster 7 is branched in a U-shape and branched. It relates to a four-wheel braking parking brake system by a combined clevis that connects the brake pedal (3) to the rod (33) and the cable (53) of the parking hand lever (51) to the other branch rod (35). The branch rods 33 and 35 of the pedal clevis satisfy the commercial braking by the pedal and the parking braking by the parking hand lever at the same time, thereby simultaneously braking the four wheels during parking, thereby doubling the parking braking force.

Description

4 wheel parking brake system adopting a combination clevis

The present invention relates to a four-wheel braking parking brake system by a dual clevis, and more particularly, a pedal clevis installed between a brake pedal and a brake booster to transmit a driver's foot force applied to the brake pedal to the brake master cylinder through the booster. A four-wheel braking parking brake system with a combined clevis that makes it possible to use the brake as a commercial brake and a parking brake so that the brake pedal can be operated as well as the reciprocating motion that generates the braking pressure in the master cylinder by the parking hand lever. will be.

In recent years, the number of vehicles is rapidly increasing, while the road expansion rate is stagnant. In large cities such as Seoul, there is not enough parking space due to congestion. If you park your car on a hillside and the driver leaves the car, you may not have fully activated the parking brake, or do not put a wedge on the underside of the wheel at the same time as the parking brake works even if the slope is very steep. Otherwise, there is a risk that the car may slide forward or backward depending on the slope direction of the hill despite the operation of the parking brake.

Therefore, the present invention has been proposed to brake all four wheels during parking as a means for preventing the accident if the vehicle slips back and forth due to the inclination of the road surface when the car is parked.

The general parking brake system is a commercial brake system that is operated by a pedal to control the speed of a vehicle or to maintain a temporary stop while the driver frequently operates the vehicle, as well as a braking device that is used when the vehicle is parked or stopped for a long time. When a breakdown occurs in the hydraulic line of the brake, it also serves as an emergency braking means that can cope with the breakdown quickly.

This commercial and parking brake system is shown schematically in FIG. 1 at 101, where a commercial brake system is provided by a brake pedal 103 operated by a driver, a clevis 105 connected to the pedal 103. The booster 107 for backing the transmitted pedal force, the master cylinder 109 for generating a braking pressure by the stepping force boosted by the booster 107, and the rear left and right proportioning valves 111 and 113 are connected to the rear left and right wheels ( Rear left and right hydraulic pipes 115 and 117 which transmit the hydraulic pressure generated in the master cylinder 109 to each of the 119 and 121, and front left and right hydraulic pipes 123 and 125 which transmit the hydraulic pressure generated in the master cylinder 109 to the front left and right wheels 127 and 129, respectively. )

In addition, the parking brake system includes a hand lever 151 which is manually operated by a driver, a front cable 153 connected to the hand lever 151, and a rear cable 153 connected to the front cable 153 to brake the rear left and right wheels 119 and 121. The rear left and right cables 155 and 157 are formed.

Accordingly, the left and right rear cables 155 and 157 connected to the rear left and right wheels 119 and 121 of the vehicle by lifting the hand lever 151 and pulling the front cable 153 during parking are the rear left and right wheels shown in FIGS. 2 and 3. Guided along the cable guide 161 in the brake assembly 159 to attract the drum brake parking lever 163, so that the leading and trailing brake shoes 165, 167 are in close contact with the brake drum, so that the rear left and right wheels Will brake (119,121).

However, a vehicle equipped with the conventional commercial and parking brake system 101 brakes only the rear wheels 119 and 121 when parking, so when parking on a steep hill road or when the weight of the vehicle is increased due to excessive snow or the snow road In the case of slippery, the braking force was lowered and the risk of slipping remained.

Therefore, the present invention was devised to solve the problems of the conventional parking brake system as described above. When the parking brake of the car is operated, the master cylinder of the commercial brake system is pressed by the clevis connected with the parking hand lever. The purpose of the present invention is to prevent vehicle slippage that may occur when parking by doubling the braking force by braking all four wheels by the braking pressure generated in the master cylinder.

1 is a schematic diagram illustrating a conventional commercial and parking brake system for a motor vehicle.

FIG. 2 is an assembly view of the rear drum brake shown in FIG. 1. FIG.

3 is a cross-sectional view taken along the line AA of FIG.

Figure 4 is a schematic diagram showing a commercial and parking brake system for a vehicle according to the present invention.

5 is an assembly view of the rear drum brake shown in FIG.

6 is a cross-sectional view taken along the line AA of FIG. 5.

Explanation of symbols on the main parts of the drawings

1: parking brake system 3: brake pedal

7: booster 9: master cylinder

31: clevis 33, 35: branch load

41: parking arm 51: parking hand lever

53: cable

Therefore, in order to achieve this object, the present invention aims at branching the pedal-side end of the clevis mounted between the brake pedal and the brake booster in a U-shape in a vehicle brake system so that the brake pedal is applied to one branch rod and the other. It is intended to provide a four-wheel braking parking brake system by a dual clevis that connects the parking hand lever cable to the side branch rod.

Hereinafter, an embodiment of the four-wheel brake parking brake system according to the present invention with reference to the accompanying drawings in detail as follows.

As shown in FIG. 4, the automobile braking system to which the four-wheel braking parking brake system 1 according to the present invention is applied is largely divided into a commercial brake system and a parking brake system 1.

Here, the commercial brake system multiplies the stepping force input by the brake pedal 3 through the booster 7 like the general commercial brake system, transfers it to the master cylinder 9 to form a braking pressure, and then fronts it. Braking oil is supplied to the front left and right wheels 27 and 29 and the rear left and right wheels 19 and 21 through the left and right hydraulic lines 23 and 25 and the rear left and right hydraulic lines 19 and 21 to brake the respective wheels. have.

The parking brake system 1 of the present invention, which is configured to correlate with the commercial brake system configured as described above, is mounted between the brake pedal 3 and the brake booster 7 of the commercial brake system, unlike the general parking brake system. The end of the pedal 3 side of the clevis 31 is branched in a U shape, and one branch rod 33 is connected to the brake pedal 3 so as to perform normal commercial braking, while the other end Is connected to the cable 53 of the parking hand lever 51 by the parking arm 41.

At this time, the parking arm 41 is supported by a fixing pin 43 inserted through the center to be rotatably fixed, a cable 53 connected to the parking hand lever 51 is attached to one end, the other At one end, a rectangular slot 47 machined in the longitudinal direction is provided, and the rectangular slot 47 is slidably with the sliding protrusion 45 protruding from the surface of the branch rod 35 of the clevis 31. When the parking arm 41 is rotated by the cable 53, the projection 45 moves up and down in the slot 47 so that the rotational movement of the parking arm 41 is smooth by the linear movement of the clevis 31. Can be converted to

In this way, the clevis 31 moves according to the operation of the parking hand lever 51 to pressurize the master cylinder 9, thereby braking all four wheels through the usual commercial brake line.

As described above, according to the parking brake system 1 of the present invention, not only normal commercial braking is possible by the branch rod 33 of the clevis 31, but also the end of the hand lever 3 is pulled out by pulling the parking hand lever 51. The cable 53 connected to the portion is pulled out to rotate the parking arm 41 about the pin 43, whereby the clevis 31 is moved toward the booster 7 by the branch rod 35. Activate the booster (7).

The braking pressure transmitted to the booster 7 is the rear left and right wheels 19, 21 via the hydraulic lines 15, 17, 23, 25 via the master cylinder 7 as in the conventional commercial brake system. ) And the front left and right wheels 27 and 29, and the braking pressures transmitted to the respective wheels 19, 21, 27 and 29 are separated by a cable guide or drum brake parking as illustrated in FIGS. 5 and 6. Brake lining 68 attached to the outer surface of shoes 65 and 67 by expanding the wheel cylinder 69 of drum brake 59 directly and not by lever to extend leading and trailing brake shoes 65 and 67 The brake drum is pressed to brake all four wheels of the vehicle.

As described above, according to the four-wheel braking parking brake system of the present invention, the clevis having the branch rod connected to the parking hand lever is used to park all four wheels by using the parking brake assembly as it is. The braking force can be doubled than the braking force in the case of braking only the rear wheels, thus minimizing the possibility that the car can slide according to its own weight, road inclination or road surface slippage, thereby minimizing the possibility of large accidents that may occur due to the sliding of the body. It can be prevented in advance.

In addition, it is possible to eliminate the configuration for parking brakes, such as cable guides and drum brake parking levers, from the drum brakes, thereby reducing the production cost of brakes, and also making the shapes of leading brake shoes and trailing shoes identical. This allows the brake shoes to be used in common, thus improving production efficiency.

Although the present invention has been shown and described in connection with specific embodiments, it is common knowledge in the art that various modifications and changes can be made without departing from the spirit and scope of the invention as indicated by the appended utility model registration claims. Anyone who has a can easily know.

Claims (3)

In the automobile brake system 1, the end of the pedal 3 side of the clevis 31 mounted between the brake pedal 3 and the brake booster 7 is branched in a U shape to form a branch rod 33. 4) Brake parking brake system by a combined clevis, characterized in that the brake pedal (3) and the other branch rod (35) to connect the cable (53) of the parking hand lever (51). The method of claim 1, wherein the branch rod (35) is connected to the cable (53) by a parking arm (41) which is slidably coupled so as to pivotally rotate by the manipulation of the parking hand lever (51). 4-wheel braking parking brake system. According to claim 2, wherein the parking arm 41 is rotatably fixed by a fixing pin 43 inserted through the center, one end is connected to the cable 53, the other end of the branch rod The four-wheel braking parking brake system, characterized in that the longitudinal slot 47 is machined to be slidably coupled with the sliding protrusion 45 protruding from the surface of the (35).