KR101910854B1 - Electronic drum parking brake for trucks to prevent loosening - Google Patents

Abstract

The present invention relates to an electronic drum parking brake for trucks to prevent loosening, and more specifically relates to the electronic drum parking brake for trucks to prevent loosening which is for preventing loosening of a nut spring holder fixing a plurality of disk springs composed in the electronic drum. According to the present invention, a screw and angular outer circumferential parts of the nut spring holder not for preventing chemical loosening are correspondingly coupled and fixed to a serration of a spring plate, and the spring plate is re-fixed to a piston via a key such that the electronic drum parking brake is not loosen regardless of usage environments, thereby capable of preventing maintenance and risk of accidents in advance.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic drum parking brake for trucks,

The present invention relates to an electronic drum parking brake for a truck, and more particularly, to an electronic drum parking brake for preventing loosening of an internal mounted nut assembly and a nut spring holder which fixes the nut assembly.

Generally, a parking brake is a method of stopping an automobile on the road or ground when a car is parked. There are a foot brake system and a hand brake system. Generally, a hand brake system is used for a compact car. The foot brake method is widely used.

As is well known, in the conventional parking brake system, when the driver operates the parking lever in the room, the parking rod pulls the operating lever of the rear drum brake. At this time, the lining connected to the operating lever is expanded and pressed toward the drum The wheels are braked using the friction between the drum and the lining.

More specifically, in the conventional parking brake system, when the parking rod is pulled by the parking lever, the operating lever attached to one of the lining in the drum brake is interlocked and pulled. At this time, the lining is extended around the lining- Thereby making parking possible.

The conventional manual parking brake for braking the wheels by operating the parking lever in this way is very inconvenient because the driver has to manually operate the parking lever each time the parking brake is applied and the parking brake is often forgotten so that the risk of a safety accident .

Recently, an electronic parking brake (EPB) is used for solving the inconvenience of such manual parking braking. The electronic parking brake (EPB) keeps the braking state safely while performing the parking operation using the driving force of the motor. When the motor is driven by operating the operation button in the vehicle cabin, the parking brake is normally pulled according to the rotation of the motor so as to generate an equal braking force on each wheel.

However, in the case of such an electronic drum brake, since a component for pushing a break shoe having a lining formed in an electronic drum inside the electronic drum is loosened due to frequent use or various use environments, , Frequent repairs and accidents.

Korean Registered Patent No. 10-1305120 (Registered on Mar. 02, 2013)

SUMMARY OF THE INVENTION It is an object of the present invention to provide an electronic drum brake for a truck which is capable of preventing the screw fastening of the internal components from being released by the use environment, The spring plate is further provided with a spring plate for forming a serration part at the periphery thereof. Thus, the nut spring holder for preventing a plurality of disc spring springs is firstly prevented from being loosened and the spring plate is also fixed to the inside of the piston by the key. The present invention relates to an electronic drum parking brake for a truck for preventing loosening which is not generated at all.

Other objects and advantages of the present invention will be described hereinafter and will be understood by the embodiments of the present invention. Further, the objects and advantages of the present invention can be realized by the means and the combination shown in the claims.

SUMMARY OF THE INVENTION The present invention, as a means for solving the above problems,

And is installed in the truck electronic drum 100 so that the brake shoe 110 in the electronic drum 100 can be pressed against the inner wall of the drum 100 to securely park the vehicle, A ball screw 10 installed in the electronic drum so as to be linearly movable left and right by a power transmission means; A plurality of disk springs 25 are tightly coupled to each other to form an integral body and a plurality of angles are formed on the outer periphery of the disk springs 25 to prevent the disk springs 25 from being separated from each other. A nut assembly (20) having a nut spring holder (26) for receiving the nut spring (26); A main depression 32 is formed on both sides of the ball screw 10 so that the nut assembly 20 is inserted and an inner peripheral edge corresponding to the fastening position of the nut spring holder 26 A piston (30) facing the longitudinal direction from one side to the other and having a plurality of first and second keyways (33, 34) formed at an end to the main depression (32); A serration portion 41 is formed in the inner periphery of the piston 30 so that a large number of angular portions of the nut spring holder 26 are connected to the serration portion 41 And the first and second keys 42 and 43 inserted in correspondence with the first and second keyways 33 and 34 are opposed to each other at the outer periphery of the nut spring holder 26, A spring plate 40 protruding from the nut 30 to fix the nut spring holder 26 in the piston 30 and prevent the nut spring holder 26 from being loosened; And a control unit.

As described above, in the electronic drum parking brake for truck, the nut spring holder (nut) for fixing the internal nut assembly is prevented from being released by the serrated spring plate, and the spring plate is also fixed to the piston by the key By virtue of this structure, no loosening occurs and there is no risk of repairs and accidents.

The present invention has a simple structure and is easy to manufacture and easy to use.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of an electronic drum parking brake for a truck according to an embodiment of the present invention. FIG.
Figure 2 is a view of the coupling of Figure 1;
3 is a view of one embodiment of a piston according to the present invention.
4 is a view of an embodiment of a nut assembly according to the present invention.
5 is a view of one embodiment showing a spring plate according to the present invention.
Figures 6 and 7 are views of one embodiment showing a peripheral structure of a conventional electronic drum parking brake.

Before describing in detail several embodiments of the invention, it will be appreciated that the application is not limited to the details of construction and arrangement of components set forth in the following detailed description or illustrated in the drawings. The invention may be embodied and carried out in other embodiments and carried out in various ways. It should also be noted that the device or element orientation (e.g., "front," "back," "up," "down," "top," "bottom, Expressions and predicates used herein for terms such as "left," " right, "" lateral, " and the like are used merely to simplify the description of the present invention, Or that the element has to have a particular orientation. Also, terms such as " first "and" second "are used herein for the purpose of the description and the appended claims, and are not intended to indicate or imply their relative importance or purpose.

The present invention has the following features in order to achieve the above object.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately It should be interpreted in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined.

Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

According to one embodiment of the present invention,

And is installed in the truck electronic drum 100 so that the brake shoe 110 in the electronic drum 100 can be pressed against the inner wall of the drum 100 to secure the vehicle in a parked state, A ball screw 10 installed in the electronic drum so as to be linearly movable left and right by a power transmission means; A plurality of disk springs 25 are tightly coupled to each other to form an integral body and a plurality of angles are formed on the outer periphery of the disk springs 25 to prevent the disk springs 25 from being separated from each other. A nut assembly (20) having a nut spring holder (26) for receiving the nut spring (26); A main depression 32 is formed on both sides of the ball screw 10 so that the nut assembly 20 is inserted and an inner peripheral edge corresponding to the fastening position of the nut spring holder 26 A piston (30) facing the longitudinal direction from one side to the other and having a plurality of first and second keyways (33, 34) formed at an end to the main depression (32); A serration portion 41 is formed in the inner periphery of the piston 30 so that a large number of angular portions of the nut spring holder 26 are connected to the serration portion 41 And the first and second keys 42 and 43 inserted in correspondence with the first and second keyways 33 and 34 are opposed to each other at the outer periphery of the nut spring holder 26, A spring plate 40 protruding from the nut 30 to fix the nut spring holder 26 in the piston 30 and prevent the nut spring holder 26 from being loosened; And a control unit.

After the spring plate 40 is mounted in the piston 30, the spring plate 40 is inserted into the insertion portion 35 recessed at one side of the piston 30 so that the spring plate 40 is detached from the outer side A ring member (50) interlocked so as to be interrupted; Is further provided.

The nut assembly 20 has a fixing plate 21 formed at one side thereof and a screw thread formed at the outer circumference of the other side thereof. The nut assembly 20 passes through the nut assembly 20 in the longitudinal direction, and corresponds to one side of the ball screw 10, A nut screw (23) formed thereon; A plate 24 which is tightly fixed to the fixing plate 21 of the nut screw 23; A plurality of disc springs 25 fastened to the nut screws 23 after the plates 24 are fastened; A nut spring holder (26) fastened to the outer peripheral edge of the other side of the nut screw (23) and interrupting release of the plurality of disc springs (25); .

In addition, the piston (30) has a coupling part (31) formed on the outer circumference of the other end to be engaged with the brake shoe (110). A first depression (36) into which one end of the ball screw (10) fastened with the nut assembly (20) is inserted; A second depression (37) whose outer periphery has the same shape as the angled nut screw (23) so that the nut screw (23) located at one end of the nut assembly (20) corresponds; And a control unit.

Hereinafter, an electronic drum parking brake for a truck for preventing loosening according to a preferred embodiment of the present invention will be described in detail with reference to FIGS. 1 to 7. FIG.

The electronic drum parking brake for truck according to the present invention includes a ball screw 10, a nut assembly 20, a nut spring holder 26, a piston 30, a spring plate 40, a ring member 50, .

The ball screw 10 is a shaft having a predetermined thickness and a forming portion 11 for forming a worm wheel (or a worm gear) is formed at a middle portion of the ball screw 10. Both ends of the forming portion 11 are horizontal (G, the threads of the other components are denoted by the same reference numerals) are formed on the outer periphery.

When the worm wheel is formed in the stop forming portion 11, a separate worm shaft corresponding to the worm wheel is rotated by receiving the rotational force from the driving means (such as a motor) so that the rotational movement of the worm shaft is received by the worm wheel So that the screw 10 linearly moves to both sides. When the ball screw 10 is moved to one side of the ball screw 10, the piston 30 connected to the ball screw 10 has a break shoe 110, which forms a break lining on the outer circumference of the ball screw 10 Is pressed toward the peripheral side of the electronic drum 100 (hereinafter, referred to as a 'drum' for the convenience of explanation) in which the ball screw 10 is installed, so that the wheel is braked using the frictional force between the drum 100 and the lining It will be done. (This is the general structure of a well-known electronic drum brake.)

A piston 30 for inserting the nut assembly 20 and the nut spring holder 26 in the state where the nut assembly 20 and the nut spring holder 26 are fastened to both ends of the ball screw 10, And a spring plate 40 and a ring member 50 for preventing the nut spring holder 26 from being loosened are also fastened to one end of the piston 30 thus fastened.

The nut assembly 20 is fastened and fixed to both sides of the ball screw 10 described above, and a plurality of disk springs 25 closely contact to each other.

More specifically, the nut assembly 20 includes a nut screw 23, a plate 24, and a plurality of disc springs 25.

The nut screw 23 has a hexagonal ring-shaped fixing plate 21 formed at one side thereof and a body portion 22 in which a plurality of disk springs 25 to be described later are inserted. G are formed on the inner circumferential surface of the ball screw 10. The inner portion of the ball screw 10 is threaded through the ball screw 10 in the longitudinal direction so that the thread G is threaded.

The plate 24 is in close contact with the fixing plate 21 of the nut screw 23 and is a circular plate.

The disc springs 25 are sequentially inserted into the recess of the nut screw 23 after the plate 24 is fastened.

A nut spring holder 26 (a hexagonal nut shape) is screwed to the outer peripheral edge of the other side of the nut screw 23 where the thread is formed, thereby preventing the disc springs 25 from being separated from each other.

These nut assemblies 20 are screwed to the respective sides of the ball screw 10 from the positions where the nut spring holders 26 are fastened to the nut screws 23, respectively.

The piston 30 is fastened to both sides of the ball screw 10 so that the main depression 32 is formed therein and the nut assembly 20 is inserted into the piston.

That is, one end is opened and the other end is closed, and one side of the opening is fastened to both sides of the ball screw 10.

In the inner periphery of the piston 30 corresponding to the fastening position of the nut spring holder 26 close to the stop of the ball screw 10 in the structure of the nut assembly 20, And a plurality of first and second keyways (33, 34) are formed in a step with the main depression (32).

A coupling portion 31 is formed on the outer circumference of the other end of the piston 30 to be engaged with the brake shoe 110 in the electronic drum so that a part of the brake shoe 110 is fitted into the coupling portion 31, .

A first depressed portion 36 into which one end of the ball screw 10 fastened with the nut assembly 20 is inserted is formed in the other end inner wall of the nut assembly 20, A second depressed portion 37 having the same shape as that of the angled nut screw 23 is also formed so that the nut screw 23 located at the outer periphery of the piston 30 corresponds to the first and second recesses 37, And the portions (36, 37) are formed to be recessed in a stepwise manner.

The spring plate 40 is fastened to the outer periphery of the nut spring holder 26 inside the piston 30 to prevent rotation of the nut spring holder 26 and prevent loosening of the nut spring holder 26 to be.

The spring plate 40 has a ring shape with a perforated center, and a serration portion 41 (surface-processed in a wavy shape) is formed on the inner periphery of the spring plate 40 so that a large number of angular portions of the nut spring holder 26 (In the present invention, the nut spring holder 26 has a hexagonal nut shape) and is locally fitted and fitted into the plurality of grooves formed by the serration part 41 so that the nut spring holder 26 is fixed at the first position.

The first and second keys 42 and 43, which are inserted into the first and second keyways 33 and 34 formed on the inner peripheral edge of the opening of the piston 30, The first and second keys 42 and 43 of the outer periphery slide in the first and second keyways 33 and 34 of the piston 30 when the first and second keys 42 and 43 are protruded from the nut spring holder 26 and fastened to the outer periphery of the nut spring holder 26, And the spring plate 40 itself is also prevented from rotating in the piston 30 by being fastened to the outer periphery of the nut spring holder 26 while correspondingly being inserted so that the nut spring holder 26 is fixed in the second position to prevent loosening .

The spring member 40 is inserted into the piston 30 and then inserted into the insertion portion 35 recessed at one side of the piston 30 so that the spring plate 40 So that they can not be detached from the outside.

In the present invention, such a ring member 50 is a C-ring of a C-shaped type having a part thereof opened.

In addition, in the present invention, the portion where the thread G is formed is composed of the outer periphery of both ends of the ball screw 10, the inner periphery and the one outer periphery of the hole opened in the longitudinal direction of the nut screw 23, .

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It is to be understood that various changes and modifications may be made without departing from the scope of the appended claims.

10: ball screw 11: forming part
20: nut assembly 21: fixing plate
22: body portion 23: nut screw
24: plate 25: disk spring
26: nut spring holder 30: piston
31: fastening part 32: main depression
33: first key groove 34: second key groove
35: insertion groove 36: first depression
37: second depression 40: spring plate
41: Serration part 42: First key
43: second key 50: ring member
100: drum, electronic drum 110: brake shoe
G: thread

Claims (4)

And is installed in the truck electronic drum 100 so that the brake shoe 110 in the electronic drum 100 is pressed toward the inner wall of the drum 100,
A ball screw (10) formed in each of the two outer peripheries and provided in the electronic drum so as to be linearly movable left and right by power transmission means;
A plurality of disk springs 25 are tightly coupled to each other to form an integral body and a plurality of angles are formed on the outer periphery of the disk springs 25 to prevent the disk springs 25 from being separated from each other. A nut assembly (20) having a nut spring holder (26) for receiving the nut spring (26);
A main depression 32 is formed on both sides of the ball screw 10 so that the nut assembly 20 is inserted and an inner peripheral edge corresponding to the fastening position of the nut spring holder 26 A piston (30) facing the longitudinal direction from one side to the other and having a plurality of first and second keyways (33, 34) formed at an end to the main depression (32);
A serration portion 41 is formed in the inner periphery of the piston 30 so that a large number of angular portions of the nut spring holder 26 are connected to the serration portion 41 And the first and second keys 42 and 43 inserted in correspondence with the first and second keyways 33 and 34 are opposed to each other at the outer periphery of the nut spring holder 26, A spring plate 40 protruding from the nut 30 to fix the nut spring holder 26 in the piston 30 and prevent the nut spring holder 26 from being loosened;
And an electronic drum parking brake for a truck for preventing loosening.
The method according to claim 1,
After the spring plate 40 is mounted in the piston 30, the spring plate 40 is inserted into the insertion portion 35 recessed at one side of the piston 30 so that the spring plate 40 is prevented from being detached from the outside A ring member (50);
And an electronic drum parking brake for a truck for preventing loosening.
The method according to claim 1,
The nut assembly (20)
A nut screw (23) is formed on one side of the fixing plate (21), a screw thread is formed on the outer side of the other side, a screw thread is formed on the inside of the ball screw (10) ;
A plate 24 which is tightly fixed to the fixing plate 21 of the nut screw 23;
A plurality of disc springs 25 fastened to the nut screws 23 after the plates 24 are fastened;
A nut spring holder (26) fastened to the outer peripheral edge of the other side of the nut screw (23) and interrupting release of the plurality of disc springs (25);
Characterized in that the electronic drum parking brake for a truck is provided.
The method according to claim 1,
The piston (30)
A coupling part 31 formed at the outer circumference of the other end to be coupled to the brake shoe 110;
A first depression (36) into which one end of the ball screw (10) fastened with the nut assembly (20) is inserted;
A second depression (37) whose outer periphery has the same shape as the angled nut screw (23) so that the nut screw (23) located at one end of the nut assembly (20) corresponds;
And an electronic drum parking brake for a truck for preventing loosening.

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