WO2014021647A1

WO2014021647A1 - Disk brake for vehicle having gear connection

Info

Publication number: WO2014021647A1
Application number: PCT/KR2013/006920
Authority: WO
Inventors: 지현철; 이장춘; 하동진
Original assignee: 상신브레이크 주식회사
Priority date: 2012-07-31
Filing date: 2013-07-31
Publication date: 2014-02-06
Also published as: DE112013003810T5; CN104428555A; JP5946967B2; KR20140017460A; KR101525147B1; DE112013003810B4; CN104428555B; JP2015524544A

Abstract

A disk brake for a vehicle, according to the present invention, comprises: a lever which is installed so as to be able to rotate about a lever shaft; and a thrust assembly for compressing a brake pad so as to be in parallel with a thrust shaft, which is perpendicular to the lever shaft, by means of the rotation of the lever, wherein the thrust assembly comprises an adjuster gear which is rotated by means of the rotation of the lever, an auxiliary gear which is coupled to the adjuster gear, a piston gear which is coupled to the auxiliary gear and moves in parallel to the thrust shaft by means of the rotation of the lever, a piston which is screw-coupled to the piston gear from the exterior of the piston gear, and a traverse for guiding the piston in parallel with the thrust shaft from the exterior of the piston. The disk brake, according to the present invention, can synchronize adjusters with a simple structure. Also, the present invention has a wide loading gap, and can easily secure a space for installing a sensor or a manual adjuster.

Description

[Revision 07.09.2013 by Rule 26] 규칙 Disc brake for vehicle with gear connection

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc brake for a vehicle, and more particularly, to a disc brake having a simple structure, a wide load space, and easy space securing.

Wear of the brake pads or brake discs increases the clearance between the brake pads and the brake discs. By increasing the gap between the brake pad and the brake disc, the brake actuator must travel longer distances to apply the brake. That is, there is a larger gap when applying the brake, which makes the effect of the brake smaller. To compensate for this gap, an adjuster is needed to move the brake pad closer to the brake disc. This adjustment ensures a constant amount of movement of the actuator even if the brake pads are worn.

Conventional disc brakes use a chain or one gear to synchronize the two adjustment spins that make up the adjuster. When using a chain, there is a problem in that the structure is complicated. In the case of using one gear, the distance between the two adjustment spindles cannot be sufficiently secured, so that the load is concentrated on the brake disc and it is difficult to secure a space for installing the sensor and the manual adjuster.

Accordingly, an object of the present invention is to provide a disc brake capable of synchronizing between adjusters with a simple structure.

Another object of the present invention is to provide a disk brake having a wide load interval and which can easily secure a space for installing a sensor or a manual adjuster.

The present invention for achieving this object is a disc brake for a vehicle, comprising: a lever rotatably mounted about a lever axis; and a brake pad being pressed in parallel to a thrust axis perpendicular to the lever axis by rotation of the lever. And a thrust assembly, wherein the thrust assembly includes an adjuster gear that rotates by rotation of the lever, an auxiliary gear that is engaged with the adjuster gear, and the thrust assembly that is engaged with the auxiliary gear and is rotated by the lever. A piston gear moving parallel to the shaft, a piston screwed to the piston gear outside the piston gear, and a traverse for guiding the piston parallel to the thrust axis outside the piston. It features.

Preferably, a manual adjuster or a wear sensor is installed at the position of the auxiliary gear. The lever further has a finger portion, and is further provided with an adjuster shaft gear which is engaged with the finger portion of the lever and is fixed coaxially to the upper portion of the adjuster gear.

In addition, the present invention provides a disc brake for a vehicle, comprising: a lever rotatably mounted about a lever shaft; and a thrust assembly for pressing the brake pad in parallel with a thrust shaft perpendicular to the lever shaft by rotation of the lever. The thrust assembly includes an adjuster gear that rotates by the rotation of the lever, a first auxiliary gear that is engaged with the adjuster gear, and the first auxiliary gear that is engaged with the thrust assembly. A first piston gear moving in parallel to the shaft, a second auxiliary gear engaged with the adjuster gear, and a second auxiliary gear engaged with the second auxiliary gear and moving in parallel with the thrust axis by rotation of the lever. Another feature is to include two piston gears.

Disc brake according to the present invention having the above-described features is a simple structure can be synchronized between the adjusters. In addition, the present invention has a wide load interval, and can easily secure a space for installing a sensor or a manual adjuster.

1 is a cross-sectional view of a disc brake according to an embodiment of the present invention.

FIG. 2 is a view for explaining the gear connection of the thrust assembly 14 shown in FIG.

3 is a perspective view from below of a disc brake according to an embodiment of the present invention, and FIG. 4 is a perspective view from above.

5 is a view for explaining the fastening of the guide groove 48 and the guide pin 26.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention; The above-described embodiment and the configuration shown in the accompanying drawings are only exemplary embodiments of the present invention, and do not represent all of the technical ideas of the present invention. Therefore, it should be understood that there may be various equivalents and variations.

1 is a cross-sectional view of a disc brake according to an embodiment of the present invention. As shown, the disc brake 10 has a lever 12 and a thrust assembly 14. The housing 11 receives the lever 12 and the thrust assembly 14 and bears the load generated by them.

When the driver activates the brake, the input load (indicated by L and arrow) is transmitted to the lever 12. The lever 12 is rotatably supported by the bearing 18. The lever 12 rotates about a lever axis (not shown). That is, the lever 12 rotates clockwise about the lever axis in FIG. 1. The base of the lever 12 has a recess 19 that can hold the cylindrical roller 16. The roller 16 has a rotation center different from the rotation center of the lever 12. That is, the roller 16 moves in an arc shape with respect to the lever axis.

The input load L causes the lever 12 to rotate about the lever axis and the roller 16 to move in an arc with respect to the lever axis. This eccentric movement of the roller 16 is connected to one or more piston gears 20 to apply a load to the thrust assembly 14, which load the thrust assembly 14 to the housing 11. While being guided to move vertically in a direction away from the lever (12). This movement defines a thrust axis 30 perpendicular to the roller axis and the lever axis. Movement along the thrust shaft 30 of the thrust assembly 14 is connected to the brake pad 42 via the back flake 40. As a result, the brake pad 42 presses the brake disc. When the driver releases the brake, the input load L is removed and the return spring 44 causes the thrust assembly 14 to return to its original position. The lever 12 and the roller 16 also return to their original positions. The return spring 44 allows the thrust assembly 14, the lever 12, and the roller 16 to remain in place when the input load L is not applied.

The thrust assembly 14 is guided by a housing 11 attached to the carrier 46. The thrust assembly 14 has a piston gear 20, a piston 22, a traverse 24, and a tappet 28. The piston gear 20 is connected to the lever 12 via the gear connection shown in FIG. 2. The piston 22 is screwed with the piston gear 20 at the outside of the piston gear 20. The traverse 24 functions to guide the piston 22 from the outside of the piston 22. Since the rotation of the piston 22 is limited by the traverse 24, when the piston gear 20 rotates, the length of the thrust assembly 14 in the direction of the thrust axis 30 is changed. Guide pin 26 prevents piston 22 from rotating relative to traverse 24. In this embodiment, the guide pin 26 is coupled to the piston 22 and the guide groove 48 is formed in the traverse 24. In other embodiments, the guide pin may be coupled to the traverse 24 and the guide groove may be formed in the piston 22. The piston 22 is coupled to a tappet 28 which presses the brake pad 42 on the opposite side of the lever 12.

The lengths of the two thrust assemblies in the disc brakes shown in FIGS. 3 and 4 are synchronized by the gear connection shown in FIG. 2. FIG. 2 is a view for explaining the gear connection of the thrust assembly 14 shown in FIG. The adjuster gear 36, the sensor gear 38, the manual adjuster gear 32, and the

piston gears

20a, 20b rotate about an axis parallel to the thrust shaft 30. The adjuster shaft 34 is engaged with the finger portion 50 of the lever 12. The adjuster shaft 34 has a groove 51 engaged with the finger portion 50. The adjuster gear 36 is coaxially coupled with the adjuster shaft 34. The piston gear 20a is engaged with the adjuster gear 36 via the sensor gear 38 provided at the sensor 37 position. The piston gear 20b is engaged with the adjuster gear 36 via the manual adjuster gear 32 installed at the position of the manual adjuster 31.

When the lever 12 rotates, the adjuster shaft 34 engaged with the finger portion 50 of the lever rotates counterclockwise. The adjuster gear 36 is rotated counterclockwise in the same way as the adjuster shaft 34 because the adjuster gear 36 is coupled to the same shaft as the adjuster shaft 34. Accordingly, the sensor gear 38 rotates clockwise and the right piston gear 20a rotates counterclockwise. On the other hand, the manual adjuster gear 32 rotates clockwise and the left piston gear 20b rotates clockwise. In this way, the rotational force of the lever 12 is transmitted simultaneously to the two

piston gears

20a and 20b.

Through this gear connection, the spacing between the two

piston gears

20a and 20b is widened. Therefore, the load space applied to the brake disk is wide, and it is easy to secure a space for installing the manual adjuster, sensor, and the like. Therefore, there is no need to provide a space for installing a manual adjuster, a sensor, and the like.

3 is a perspective view from below of a disc brake according to an embodiment of the present invention, and FIG. 4 is a perspective view from above. 5 is a view for explaining the fastening of the guide groove 48 and the guide pin 26.

As shown, the tappet 28 connected to one end of the piston 22 is in close contact with the back plate 40. The brake pad 42 is mounted to the back plate 40. When the lever 12 rotates about the lever shaft (not shown) by air pressure or the like, the brake pad 42 presses both sides of the brake disc (not shown). When the air pressure or the like is extinguished, the lever 12 and the thrust assembly 14 return to their positions by the action of a return spring 44. The carrier 46 is coupled with the housing 11 and receives the back plate 40 and the brake pad 42.

The traverse 24 has a guide groove 48 that is engaged with the guide pin 26. The guide groove 48 is formed by the length necessary for adjusting to the thrust axis 30 in parallel. The guide groove 48 is blocked at one end of the brake pad 42 so that the piston 22 does not fall into the brake disc (not shown) by the adjusting action.

An operation of the disc brake according to the present embodiment will be described with reference to FIGS. 1 to 5. When pneumatic pressure or the like is applied, the lever 12 rotates about the lever axis. The lever shaft and the roller shaft 17 are different and the rotation of the lever 12 causes the roller 16 to press the thrust assembly 14 parallel to the thrust shaft 30. At this time, the tappet 28 coupled to the brake disc side presses the back plate 40 to bring the brake pad 42 into close contact with the brake disc (not shown), thereby providing a braking action.

When the braking action is repeated, the brake pad 42 is worn, thereby widening the gap between the brake pad 42 and the brake disc. Therefore, in order to perform a constant braking action against the application of air pressure and the like despite the wear of the brake pad 42, the length of the thrust assembly 14 is increased according to the wear of the brake pad 42, thereby causing the brake pad 42 and the brake disc. The gap should be narrowed.

Since the finger portion 50 of the lever 12 is engaged with the groove 51 of the adjust shaft 34, the adjust shaft 34 rotates when the lever 12 rotates. The adjuster shaft 34 rotates the adjuster gear 36. The adjuster gear 36 rotates the piston gear 20a via the sensor gear 38 and rotates the piston gear 20b via the manual adjuster gear 32. Through this gear connection the two

piston gears

20a, 20b are synchronized.

The piston gears 20, 20a, 20b and the piston 22 are screwed together, and the guide pin 26 coupled to the piston 22 is fastened to the guide groove 48 formed in the traverse 24. The rotational movement of the

gears

20, 20a, 20b is converted to the linear movement of the piston 22. In other words, when the lever 12 rotates, the piston 22 moves toward the brake disc relative to the piston gears 20, 20a, 20b. As a result, the total length of the thrust assembly 14 is long, so that the widened gap between the brake pad 42 and the brake disk resulting from the wear of the brake pad 42 or the brake disk is narrowed. When the gap between the brake pad 42 and the brake disc is narrowed, even if the brake pad 42 or the brake disc is worn, a constant braking force is generated for an action such as air pressure.

As described above, although the present invention has been described by means of a limited embodiment and drawings, the present invention is not limited thereto and by those skilled in the art to which the present invention pertains, Of course, various modifications and variations are possible within the scope of equivalents of the claims to be described.

Claims

A lever rotatably mounted about the lever axis,
A thrust assembly for pressing the brake pads in parallel with a thrust axis perpendicular to the lever axis by rotation of the lever,
The thrust assembly is
Adjust gear which rotates by rotation of the said lever,
An auxiliary gear coupled to the adjuster gear,
A piston gear engaged with the auxiliary gear and moving in parallel to the thrust axis by rotation of the lever,
A piston screwed to the piston gear from the outside of the piston gear;
A traverse for guiding the piston parallel to the thrust axis outside of the piston
A disk brake for a vehicle, comprising:
The method of claim 1,
And a manual adjuster is installed at a position of the auxiliary gear.
The method of claim 1,
Disc brake for a vehicle, characterized in that the wear sensor is installed at the position of the auxiliary gear.
The method of claim 1,
The lever has a finger portion,
And an adjuster shaft gear which is fastened to the finger portion of the lever and fixed to the same axis on the upper portion of the adjuster gear.
A lever rotatably mounted about the lever axis,
A thrust assembly for pressing the brake pads in parallel with a thrust axis perpendicular to the lever axis by rotation of the lever,
The thrust assembly is
Adjust gear which rotates by rotation of the said lever,
A first auxiliary gear engaged with the adjuster gear,
A first piston gear engaged with the first auxiliary gear and moving in parallel with the thrust axis by rotation of the lever;
A second auxiliary gear engaged with the adjuster gear,
A second piston gear engaged with the second auxiliary gear and moving parallel to the thrust shaft by rotation of the lever;
A disk brake for a vehicle, comprising: