JP4507857B2 - Brake pedal device for vehicle - Google Patents

Description

  The present invention relates to a brake pedal device for a vehicle.

As a conventional vehicle brake pedal device, a pedal bracket fixed to a dash panel, a pedal having a pedal at a lower end portion, and an intermediate portion rotatably attached to the pedal bracket via a first support shaft A pivot lever pivotally attached to the pedal bracket and connected at one end to the rod of the master cylinder by a lever and a second spindle disposed below the first spindle, and a pivot The thing provided with the connection link which connects the other end part of a lever and the upper end part of a pedal lever is proposed (for example, refer to patent documents 1).
Japanese Patent Application Laid-Open No. 7-205776

  However, in the above conventional technique, when the brake pedal is depressed, the pedal lever rotates around the first support shaft, and the upper end of the pedal lever presses the connecting link, thereby transmitting the rotational force to the rotating lever. Therefore, a compression load is applied to the connection link, and the rotation center of the rotation lever, that is, the second support shaft must be arranged in an area where the connection link is not buckled. I was receiving. For this reason, in the conventional brake pedal device for a vehicle, the second support shaft of the rotation lever is disposed obliquely below the rear side of the first support shaft of the pedal lever, that is, at a position away from the dash panel. There is a problem that the lateral rigidity of the bracket is lowered.

  Also, if the second support shaft of the rotating lever is arranged at a position away from the dash panel, the pedal ratio (the ratio of the pedaling force when the pedal pedal is depressed and the output to the master cylinder with respect to the pedaling force) There is also a problem that the change margin of (2) becomes small (eg 2.6-1.8 = 0.8).

  The subject of this invention is providing the brake pedal apparatus for vehicles which can suppress the fall of the lateral rigidity of a pedal bracket and can enlarge a pedal ratio.

In order to solve the above-mentioned problem, the invention described in claim 1
A pedal bracket that is fixed to the dash panel and has a vertically long vertical cross section, and a pedal at the lower end, and the upper end is pivotally attached to the pedal bracket via a first fixed spindle The pedal bracket includes a pedal lever having a protruding portion formed on a part of the upper end portion and protruding toward the passenger compartment, and a second fixed support shaft disposed above the first fixed support shaft. A pivot lever that is pivotally attached to the rod of the master cylinder and that has the other end projecting toward the passenger compartment, and a lower portion that is connected to the pedal lever by a first movable support shaft. The upper part of each of the projecting parts is pivotally attached to the other end part of the pivot lever by a second movable support shaft, and the pedal lever and the pivot lever are sandwiched from both sides. A connecting link, and a distance between the first fixed support shaft and the second fixed support shaft is determined from a distance between the first movable support shaft and the second movable support shaft. And the distance between the second fixed support shaft and the second movable support shaft is longer than the distance between the first fixed support shaft and the first movable support shaft. A ratio of a pedaling force when the pedal lever is depressed and an output to the master cylinder with respect to the pedaling force is reduced as the pedaling force increases; And the connecting link, and in the vehicle side view, the rod is arranged so as to be surrounded by the fixed portion of the pedal bracket to the dash panel, the first fixed support shaft, and the second fixed support shaft. It is characterized by that.

  According to the above configuration, since the second fixed support shaft is located above the first fixed support shaft and can be disposed in the vicinity of the dash panel, a decrease in the lateral rigidity of the pedal bracket can be suppressed.

Further, the distance between the first fixed support shaft and the second fixed support shaft is longer than the distance between the first movable support shaft and the second movable support shaft, and the second fixed support shaft. the distance between the support shaft and the second movable shaft, since the longer than the distance between the first fixed support shaft and the first movable shaft, when you press the pedal lever, the first master If the output to the cylinder is considerably large and the depression amount (pedal stroke) is increased, the output to the master cylinder gradually decreases, and when it is fully depressed, the output to the master cylinder becomes considerably small. That is, according to the above configuration, the pedal ratio can be increased.

  According to the present invention, it is possible to suppress a decrease in the lateral rigidity of the pedal bracket and increase the pedal ratio.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 and 2 show a vehicle brake pedal device according to the present invention. FIG. 1 is a perspective view thereof, and FIG. 2 is a side view thereof. FIG. 3 is also a side view of the vehicle brake pedal device according to the present invention, which shows a state when the brake pedal is depressed.

  As shown in FIGS. 1 to 3, the vehicle brake pedal device 1 includes a pedal bracket 2 fixed to a left dash panel (not shown), a pedal 3 at a lower end portion, and an upper end portion as a first end portion. A pedal lever 5 rotatably attached to the pedal bracket 2 via the fixed support shaft 4 and a first disposition located obliquely above the front side of the first fixed support shaft 4 (obliquely on the side close to the dash panel). A pivot lever 7 rotatably attached to the pedal bracket 2 by two fixed support shafts 6 and a connecting link 8 that couples the pedal lever 5 and the pivot lever 7 are provided.

  The pedal bracket 2 has a vertically long rectangular shape in a vertical cross section, and a turning lever 7 and a connecting link 8 are accommodated therein. Further, an opening 2A is formed on the side surface of the pedal bracket 2 at a substantially central portion thereof.

  A projecting portion 5A projecting toward the passenger compartment is formed at the upper end of the pedal lever 5 (the side of the fixed support shaft 4), and the lower portion of the connecting link 8 is connected to the projecting portion 5A by the first movable support shaft 9. It is pivotally attached.

  The rotating lever 7 has a substantially inverted L-shape, and a second fixed support shaft 6 is provided at an intermediate portion thereof. A rod 10 </ b> A of the master cylinder 10 is connected to one end of the rotating lever 7 by a pin 11. The other end portion of the turning lever 7 protrudes toward the passenger compartment side, and the upper portion of the connecting link 8 is rotatably attached to the protruding portion 7A by a second movable support shaft 12.

  As described above, the protruding portion 5A of the pedal lever 5 and the protruding portion 7A of the rotating lever 7 are connected to each other via the connecting link. The pedal lever 5 and the rotation lever 7 are formed of one member, but the connecting link 8 is formed of two members and is attached with the pedal lever 5 and the rotation lever 7 sandwiched from both sides. Yes.

In the present embodiment, as shown in FIG. 4, the distance between the first fixed support shaft 4 and the second fixed support shaft 6 is L1, and the first movable support shaft 9 and the second movable support shaft 12. When the distance between and is L2, the distances L1 and L2 are set so that the following equation (1) is satisfied.
L1 ≧ L2 (1)

When the distance between the first fixed support shaft 4 and the first movable support shaft 9 is L3, and the distance between the second fixed support shaft 6 and the second movable support shaft 12 is L4. The distances L3 and L4 are set so that the following expression (2) is established.
L4> L3 (2)

  Next, the operation of the present embodiment will be described with reference to FIG. In FIG. 5, a two-dot chain line indicates a state before the brake pedal is depressed, and a solid line indicates a state when the brake pedal is depressed.

  In FIG. 5, when the pedal 3 is depressed, the pedal lever 5 is rotated clockwise around the first fixed support shaft 4, and the protrusion 5A of the pedal lever 5 is also rotated clockwise along with this rotation. To do.

  When the protruding portion 5A rotates clockwise, the connecting link 8 connected to the protruding portion 5A of the pedal lever 5 is pulled by the first movable support shaft 9, and the connecting link 8 is inclined downward so as to approach the vehicle compartment side. Move to. At this time, a tensile load is applied to the connecting link 8.

  When the connecting link 8 moves obliquely downward, a moment acts on the rotation lever 7 via the second movable support shaft 12, and the rotation lever 7 rotates clockwise about the second fixed support shaft 6. It rotates to push the rod 10A (see FIGS. 1 to 3) of the master cylinder 10 forward of the vehicle. As a result, the vehicle can be braked.

  Although not shown in the drawing, when the foot is removed from the pedal 3, the brake lever device 1, the pedal lever 5, the rotation lever 7, and the connecting link 8 are each indicated by a two-dot chain line from the position indicated by the solid line. The return mechanism which returns to the position shown by is provided.

  With respect to the vehicle brake pedal device in the present embodiment, simulation was performed on a computer while changing the distances L1 and L2 in various ways. Then, the ratio of the pedaling force (input) when the pedal lever 5 was depressed and the output to the master cylinder 10 with respect to the pedaling force, that is, the change in the pedal ratio was considered.

  As a result, as shown in FIG. 6, when L1 ≧ L2, the pedal ratio decreases as the pedal stroke increases, and the change amount of the pedal ratio is 1.71 (= 4.10-2.39). Thus, it was significantly larger than the change allowance of 0.8 in the prior art. Incidentally, when L1 <L2, the pedal ratio increases with an increase in the pedal stroke, and no improvement was found in the change ratio of the pedal ratio. The pedal ratio is preferably set to 2.5-4.

  In addition, computer simulation was performed by changing the distances L3 and L4 in various ways. As a result, when L4> L3, the load ratio increased with respect to L4 = L3, but when L4 <L3, the load ratio decreased with respect to L4 = L3.

  According to the present embodiment, since the second fixed support shaft 6 is disposed obliquely in front of the first fixed support shaft 4, it is possible to suppress a decrease in lateral rigidity of the pedal bracket 2.

  Further, according to the present embodiment, the distance L1 between the first fixed support shaft 4 and the second fixed support shaft 6 is set between the first movable support shaft 9 and the second movable support shaft 12. The distance L3 between the first fixed support shaft 4 and the first movable support shaft 9 is set to a distance between the second fixed support shaft 6 and the second movable support shaft 12. Since the distance is set to be less than the distance L4, the pedal ratio can be increased and the load ratio can be increased.

It is a perspective view of the brake pedal device for vehicles concerning the present invention. It is a side view of the brake pedal device for vehicles shown in FIG. FIG. 2 is a diagram showing a state when the brake pedal is depressed in the vehicle brake pedal device shown in FIG. 1. It is a figure which shows the positional relationship of a pedal lever, a rotation lever, and a connection link. It is a figure which shows the positional relationship of a pedal lever, a rotation lever, and a connection link when a brake pedal is depressed. It is a figure which shows the relationship between a pedal stroke, a pedal ratio, and a master cylinder stroke.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle brake pedal apparatus 2 Pedal bracket 3 Pedal 4 1st fixed support shaft 5 Pedal lever 5A Protrusion part 6 2nd fixed support shaft 7 Rotating lever 7A Protrusion part 8 Connection link 9 First movable support shaft 10 Master Cylinder 10A Rod 12 Second movable support shaft

Claims (2)

A pedal bracket that is fixed to the dash panel and has a vertically long cross section.
The lower end portion has a pedal, the upper end portion is rotatably attached to the pedal bracket via the first fixed support shaft, and a protruding portion protruding toward the vehicle compartment is formed on a part of the upper end portion. Pedal lever,
A second fixed support shaft disposed above the first fixed support shaft is rotatably attached to the pedal bracket, one end is connected to a rod of the master cylinder, and the other end is a vehicle compartment. A rotating lever arranged to protrude to the side,
The lower part is pivotally attached to the protruding portion of the pedal lever by a first movable support shaft, and the upper part is pivotally attached to the other end of the rotating lever by a second movable support shaft. It is provided with a connecting link that connects the lever in a state sandwiched from both sides,
A distance between the first fixed support shaft and the second fixed support shaft is made longer than a distance between the first movable support shaft and the second movable support shaft; the distance between the second fixed support shaft and the second movable shaft, longer than the distance between the first fixed support shaft and the first movable shaft, the pedal lever The ratio of the pedaling force when the pedal is depressed and the output to the master cylinder with respect to the pedaling force is configured to decrease as the pedaling force increases,
Further, the rotating lever and the connecting link are accommodated in the pedal bracket, and the fixed portion of the pedal bracket, the first fixed support shaft, and the second fixed portion to the dash panel in a side view of the vehicle. A vehicle brake pedal device, wherein the rod is disposed so as to be surrounded by a support shaft.   The vehicle brake pedal device according to claim 1, wherein the ratio decreases in a range of 4 to 2.5.

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