KR20080100872A

KR20080100872A - Break pedal unit with variable pedal ratio

Info

Publication number: KR20080100872A
Application number: KR1020070046848A
Authority: KR
Inventors: 김은식
Original assignee: 현대자동차주식회사
Priority date: 2007-05-15
Filing date: 2007-05-15
Publication date: 2008-11-21

Abstract

A brake pedal unit is provided to improve the braking performance keeping the same braking power with the reduced pedal force of operator since the slide guider which is integrally formed of ellipse and pedal mounting bracket is included. A brake pedal unit comprises as follows. The slide guider(7) which is integrally formed of ellipse and pedal mounting bracket is included. The brake pedal arm(15) moves along the outer circumference of the slide guider. Distance between the hinge shaft(9) and the brake pedal(21) changes. The pedal ratio is varied and the pedal effort of operator is reduced. The soft manipulation feeling of the brake pedal is implemented.

Description

Pedal ratio variable brake pedal unit {BREAK PEDAL UNIT WITH VARIABLE PEDAL RATIO}

1 is a block diagram of a brake pedal unit according to the prior art.

2 is a block diagram of a pedal ratio variable brake pedal unit according to an embodiment of the present invention.

3 is a front view of a pedal ratio variable brake pedal unit according to an exemplary embodiment of the present invention.

4 is an operation state diagram of the pedal ratio variable brake pedal unit according to an embodiment of the present invention.

The present invention relates to a variable pedal ratio brake pedal unit for a vehicle, and more particularly, when the brake pedal is operated by the driver's pedaling force, the pedal ratio is variable to increase the braking performance and to realize a smooth operation feeling in the direction of pushing the brake pedal. The present invention relates to a vehicle pedal ratio variable brake pedal unit for increasing driver convenience.

In general, the brake pedal unit is a device used when the driver wants to decelerate or stop while driving, and is to use the driver's foot.

As shown in FIG. 1, the brake pedal unit according to the related art includes a pedal mounting bracket 105 which is partially coupled to the dash panel 101 and the cowl panel 103 and installed inside the vehicle compartment, and the pedal mounting bracket. It consists of a brake pedal arm 109 and a pedal 111 at the bottom thereof which is rotatably coupled to one end of the 105 via a hinge bolt 107.

That is, the pedal mounting bracket 105 is one side is installed by the desiccant panel 101 and the mounting bolt (not shown) via the desiccant panel mounting bracket 113, the upper side of the cowl panel 103 in the cowl The panel mounting bracket 115 and the assembly bolt (not shown) are fastened.

The pedal mounting bracket 105 and the brake pedal arm 109 are connected by a spring (not shown) to enable restoration of the brake pedal arm 109 after operation.

In addition, a booster rod 119 of the brake booster 117 is connected to the brake pedal arm 109 through a hinge pin 108.

Therefore, when the driver presses the brake pedal 111, the pedal force applied to the brake pedal 111 is amplified by the brake booster 117 and converted into hydraulic pressure through the master cylinder 121 to disc brake pads (not shown). By pressurizing (not shown), a braking force is generated.

However, such a brake pedal unit requires a larger capacity as the power performance of the vehicle increases, but as the capacity of the brake system increases, the pedal power of the brake booster 117 increases, and therefore, a larger pedal power is required during braking.

In order to cope with this, if the pedal ratio determined by the distance between the hinge bolt 107 and the brake pedal 111 is increased, the pedal force of the brake pedal 111 is lowered, but the stroke is excessive, and the brake pedal 111 must be stepped deeply to brake. There is such a disadvantage that the brake operation feeling is lowered such that the driver's operation convenience is lowered.

In addition, when the capacity of the brake pedal unit is increased, there is a disadvantage that the installation space must be sufficiently secured.

Accordingly, the present invention has been made to solve the above problems, an object of the present invention is to provide an elliptical slide guider formed integrally with the pedal mounting bracket, while the brake pedal arm moves along the outer circumferential surface of the slide guider. By operating the hinge, so that the distance between the brake pedal and the hinge shaft is changed, the pedal ratio is variable to reduce the driver's responsiveness, and to provide a pedal ratio variable brake pedal unit to implement a smooth operation feeling of the brake pedal.

A pedal ratio variable brake pedal unit according to the present invention for achieving this object, the "c" shaped pedal mounting brackets mounted on one side of the vehicle inner panel; An elliptic slide guider disposed between two side plates corresponding to each other of the pedal mounting brackets, the upper end of which is welded to the pedal mounting brackets, and an hinge axis penetrates in the center thereof to be installed on both side plates of the pedal mounting brackets; A pedal arm guider disposed at one side of the slide guider and having an upper end fixed integrally with the hinge shaft, and having a guide slot formed in a longitudinal direction in a cross section; A brake pedal arm in which a lower guide pin to be inserted into a guide slot of the pedal arm guider is integrally formed at one end thereof in a state in which an upper end of the slide guider is in contact with a lower end of the slide guider; “C” shaped integrally with the end of the booster rod and mounted on the upper side of the brake pedal arm to be hinged with the brake pedal arm through an upper guide pin moving along the guide slot of the pedal arm guider. Connection bracket; And an elastic member configured to be connected between the lower guide pin of the brake pedal arm and an inner lower end of the guide slot of the pedal arm guider in the guide slot to provide an elastic force.

The slide guider is formed by its outer circumferential surface being convexly rounded, and the upper surface of the brake pedal arm which is correspondingly contacted is formed by being concavely rounded so as not to leave the slide guider in contact with the outer circumferential surface of the slide guider. It features.

The outer circumferential surface of the slide guider and the upper surface of the brake pedal arm are in sliding contact with each other, and grease is applied therebetween.

The upper guide pin is fixed so as not to be separated from the connection bracket through the washer and the fixing pin in the state fitted to the connection bracket through the guide slot of the pedal arm guider.

The lower guide pin is fixed so as not to be separated from the guide slot through the washer and the fixing pin in a state inserted into the guide slot of the pedal arm guider.

One end of the elastic member is fixed to the lower guide pin, the other end is preferably formed of a coil spring to provide an elastic force to the lower end of the guide slot of the pedal arm guider to the brake pedal arm.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail as follows.

2 and 3 are a configuration diagram and a front view of a pedal ratio variable brake pedal unit according to an embodiment of the present invention, Figure 4 is an operating state diagram of a pedal ratio variable brake pedal unit according to an embodiment of the present invention.

The pedal ratio variable brake pedal unit according to the embodiment of the present invention, as shown in Figure 2 and 3, first, on one side of the vehicle interior panel (1) assembled bolt via the panel mounting bracket (3) Pedal mounting bracket 5 is installed by (not shown).

Here, the pedal mounting bracket 5 is formed in a "c" shape.

And the slide guider 7 is disposed between the side plates corresponding to each other of the pedal mounting bracket (5).

The slide guider 7 is formed in an elliptical shape, the upper end of which is welded to the pedal mounting bracket 5, and a hinge shaft 9 penetrates in the center thereof and is installed on both side plates of the pedal mounting bracket 5.

A pedal arm guider 11 is disposed at one side of the slide guider 7.

The pedal arm guider 11 has an upper end fixed integrally with the hinge shaft 9, and a guide slot 13 is formed in a longitudinal direction in the cross section.

The upper end of the brake pedal arm 15 is in contact with a lower portion of the outer circumferential surface of the slide guider 7.

Here, the slide guider (7) is formed by its outer peripheral surface is convexly rounded, the upper surface of the brake pedal arm 15 that is in contact with the corresponding slide guider in a state in contact with the outer peripheral surface of the slide guider (7) It is formed concave round so as not to deviate from (7).

The outer circumferential surface of the slide guider 7 and the upper end surface of the brake pedal arm 15 are in sliding contact with each other. As shown in FIG. 3, grease is applied therebetween to form a grease layer 17. When the brake pedal arm 15 moves on the slide guider 7, the grease layer 17 enables smooth movement while suppressing noise generation.

The brake pedal arm 15 is integrally formed with a lower guide pin 19 fitted into the guide slot 13 of the pedal arm guider 11 at one side thereof, and a brake pedal 21 is formed at the lower end thereof.

Here, the lower guide pin 19 is fixed so as not to be separated from the guide slot 13 through the washer 23 and the fixing pin 25 in a state inserted into the guide slot 13 of the pedal arm guider 11. do.

And the connection bracket 29 is integrally formed at the end of the booster rod 27.

The connecting bracket 29 is formed in a “c” shape and has an upper guide pin 31 moving along the guide slot 13 of the pedal arm guider 11 on an upper side of the brake pedal arm 15. Through the brake pedal arm 15 and the mutual hinge operation is mounted.

Here, the upper guide pin 31 is inserted into the connection bracket 29 through the guide slot 13 of the pedal arm guider 11 through the washer 23 and the fixing pin 25 through the connection bracket. It is fixed so that it will not separate from the 29.

An elastic member 33 is provided inside the guide slot 13 of the pedal arm guider 11.

The elastic member 33 is connected between the lower guide pin 19 of the brake pedal arm 15 and the lower end of the guide slot 13 of the pedal arm guider 11, that is, the elastic member 33. One end is fixed to the lower guide pin 19, the other end is fixed to the inner bottom of the guide slot 13 of the pedal arm guider 11 to provide an elastic force to the brake pedal arm 15 It is preferable to form.

Therefore, the pedal ratio variable brake pedal unit configured as described above, when the driver is in the initial state before the operation of the brake pedal 21, as shown in (S1) of Figure 4, the brake pedal ratio (A / B) is the distance A between the hinge shaft 9 from the brake pedal 21 and the distance from the hinge shaft 9 to the upper guide pin 31 which is a mounting point of the connecting bracket 29. It becomes ratio with (B).

And, as shown in (S2) of Figure 4, when the driver's pedaling force is transmitted through the brake pedal 21, the brake pedal arm 15 is the outer peripheral surface of the slide guider 7 with the upper end in contact with Moving along the lower part, the hinge is operated to reach the turning point P, which has the maximum brake pedal ratio A '/ B'.

That is, the maximum brake pedal ratio A '/ B' is a distance A 'from the hinge shaft 9 to the brake pedal 21 and from the hinge shaft 9 to the upper guide pin 31. It becomes rain with distance (B´) of.

Here, the brake pedal arm 15 has a minimum distance between the hinge shaft 9 and the upper guide pin 31 at the turning point P, so that the driver at the point P has a minimum It is possible to operate the brake pedal 21 in response.

On the other hand, when the tip of the brake pedal arm passes the turning point P of the slide guider 7, the radius of the slide guider 7 with respect to the hinge axis 9 is gradually increased. At this time, the brake pedal ratio is smaller again, the driver's effort is required more.

The brake pedal ratio can also be varied by adjusting the radius with the hinge shaft 9 by the elliptic shape deformation of the slide guider (7).

As described above, according to the pedal ratio variable brake pedal unit according to the exemplary embodiment of the present invention, the slide guider 7 is formed in an elliptical shape so that a radius of the slide guider 7 changes around the hinge shaft 9. The brake pedal arm 15 is hinged about the hinge axis 9 while the brake pedal arm 15 moves along the lower outer circumferential surface of the brake pedal 21, and thus the distance A or A ′ and the hinge between the brake pedal 21 and the hinge axis 9. By changing the distance B or B 'between the shaft 9 and the upper guide pin 31, the brake pedal ratio is varied to reduce the driver's effort per section.

In particular, from the initial state to the turning point P, the operating radius of the brake pedal 21 is reduced compared to the prior art, which improves the operation convenience of the brake pedal in a passenger vehicle.

As described above, according to the pedal ratio variable brake pedal unit according to the present invention, the brake pedal ratio of the brake pedal arm moving along the outer circumferential surface of the elliptical slide guider is changed by the distance change from the hinge axis, thereby reducing the driver's effort. The same braking force can be maintained, which improves braking performance.

In addition, it is possible to install without a space constraint by a simple structure change, and the slide guider and the brake pedal arm by the sliding contact has the effect of increasing the ease of operation by smooth operation of the brake pedal and reducing the operating radius of the brake pedal.

Claims

A “c” shaped pedal mounting bracket mounted on one side of the vehicle interior panel;

An elliptic slide guider disposed between two side plates of the pedal mounting brackets, the upper end of which is welded to the pedal mounting brackets, the hinge shaft penetrating the center of the pedal mounting brackets, and installed on both side plates of the pedal mounting brackets;

A pedal arm guider disposed at one side of the slide guider and having an upper end fixed integrally with the hinge shaft, and having a guide slot formed in a longitudinal direction in a cross section;

A brake pedal arm in which a lower guide pin to be inserted into a guide slot of the pedal arm guider is integrally formed at one end thereof in a state in which an upper end of the slide guider is in contact with a lower end of the slide guider;

“C” shaped integrally with the end of the booster rod and mounted on the upper side of the brake pedal arm to be hinged with the brake pedal arm through an upper guide pin moving along the guide slot of the pedal arm guider. Connection bracket; And

In the guide slot, the pedal ratio variable brake pedal unit, characterized in that made of an elastic member connected between the lower guide pin of the brake pedal arm and the inner lower end of the guide slot of the pedal arm guider to provide an elastic force.

The method of claim 1,

The slide guider is formed by its outer circumferential surface being convexly rounded, and the upper surface of the brake pedal arm which is correspondingly contacted is formed by being concavely rounded so as not to leave the slide guider in contact with the outer circumferential surface of the slide guider. A pedal ratio variable brake pedal unit.

The method of claim 1,

The outer peripheral surface of the slide guider and the upper surface of the brake pedal arm is in sliding contact with each other, the pedal ratio variable brake pedal unit, characterized in that the grease is applied therebetween.

The method of claim 1,

The upper guide pin is a pedal ratio variable brake pedal unit characterized in that is fixed so as not to be separated from the connecting bracket through the washer and the fixing pin in the state fitted to the connecting bracket through the guide slot of the pedal arm guider.

The method of claim 1,

The lower guide pin is a pedal ratio variable brake pedal unit, characterized in that is fixed so as not to be separated from the guide slot through the washer and the fixing pin in the state inserted into the guide slot of the pedal arm guider.

The method of claim 1,

One end of the elastic member is fixed to the lower guide pin, the other end is fixed to the lower end of the guide slot of the pedal arm guider pedal ratio variable brake characterized in that it is formed of a coil spring to provide elastic force to the brake pedal arm Pedal unit.