JP4724166B2 - Brake master cylinder mounting structure - Google Patents

Description

  The present invention relates to an automobile brake master cylinder mounting structure.

As a brake master cylinder mounting structure of an automobile, for example, a structure in which a brake master cylinder is arranged on the engine room side of a dashboard lower portion to which a pedal bracket is mounted can be cited. By the way, the brake master cylinder is attached to the dashboard lower via a brake booster that uses engine negative pressure. In addition, if the hydraulic brake booster is used in hybrid vehicles, fuel cell vehicles, etc., it is attached to the dashboard lower alone. It will be.
Conventionally, as such an attachment structure, a structure in which a pedal bracket is attached to a passenger compartment side of a dashboard lower via a plate-like stiffener has been proposed. FIG. 6 referred to here is a cross-sectional view of a conventional mounting structure in which a pedal bracket is mounted using a stiffener.
As shown in FIG. 6, in this attachment structure, the pedal bracket 104b is attached to the dashboard lower 102a via the plate-like stiffener 101 arranged along the dashboard lower 102a on the vehicle compartment R2 side. The stiffener 101 is bent toward the vehicle compartment R2 above the stiffener 101, and the bent tip is connected to the pedal bracket 104b and the pedal bracket support 104c.
According to such an attachment structure, the support structure of the pedal bracket 104b is strengthened, and so-called brake operation feeling when the brake pedal 104a is depressed is improved.
Japanese Patent No. 3551053

  However, in the conventional mounting structure (for example, refer to Patent Document 1), for example, the dashboard lower 102a is bent so as to be convex toward the engine room R1 in order to secure a larger space inside the passenger compartment R2. The present inventors have confirmed that the rigidity of the dashboard lower 102a cannot be sufficiently secured. In particular, in a region Y from the mounting position of the brake booster 106 to the rear end of the front side frame 105, this tendency becomes prominent when the dashboard lower 102a is bent so as to protrude toward the engine room R1. Therefore, when the conventional mounting structure is applied to the dashboard lower 102a bent toward the engine room R1, there is a problem that the brake operation feeling is not sufficiently improved.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a brake master cylinder mounting structure capable of reliably improving the brake operation feeling even when applied to a bent dashboard lower.

In the brake master cylinder mounting structure of the present invention that solves the above-mentioned problem, the dashboard lower is bent to the engine room side below the mounting surface of the brake master cylinder and includes a recess on the vehicle compartment side, and the recess is A master cylinder that is formed in a groove shape extending in the vehicle width direction, and that is connected to a rear end of a front side frame of a vehicle on the engine lower side from the vehicle compartment side. stiffener, formic straddling the recessed portion up and down, and a bead which is formed as a pair on the left and right so as to be extended to a position corresponding to the connecting portion of the front side frame, said recess between said bead between those It includes a leg portion which is in contact, and the leg portion has been formed by bending the plate member so as to project in the engine room side, the leg Wherein by bending so as to follow the shape of the recessed portion formed in the dashboard lower, the recessed portion abuts, it is characterized.
In this brake master cylinder mounting structure, when the dashboard lower is about to bend toward the engine room at the recess according to the depression force on the brake pedal, a pair of beads are provided to straddle the recess, The lower part of the dashboard and the master cylinder stiffener exhibit high rigidity when the leg part comes into contact with the recessed part.

Further, in such a brake master cylinder mounting structure, at least one bead of the pair of beads is formed such that a tightening point of the brake master cylinder is positioned on an extension line in the extending direction. It is desirable.
In this brake master cylinder mounting structure, the tightening point is located on the extension line in the extending direction of the bead, so that a through hole for inserting the steering shaft into the dashboard lower is formed below the mounting position of the brake master cylinder. Even if it is, the dashboard lower and master cylinder stiffener exhibit high rigidity.

In such a brake master cylinder mounting structure, the master cylinder stiffener surrounds a collar provided at a tightening point between the master cylinder stiffener and the brake master cylinder via the dashboard lower. It is desirable to further include an enclosure bead formed, and the enclosure bead is connected to at least one of the pair of beads.
In this brake master cylinder mounting structure, the stress generated in the master cylinder stiffener around the collar is transmitted to at least one of the pair of beads via the enclosure bead. As a result, since the stress generated around the collar is dispersed, the strength of the brake master cylinder mounting structure is improved.

In such a brake master cylinder mounting structure, the rear end of the front side frame of the vehicle is connected to the dashboard lower on the engine lower side, and at least one of the pair of beads is a dash. to a position corresponding to the connecting portion of the front side frame in the vehicle compartment side of Bodoroa that have been extended.
In this brake master cylinder mounting structure, the dashboard lower and the master cylinder stiffener have higher rigidity than the one where the bead is not extended to the position corresponding to the connection part of the front side frame. Is more reliably prevented.

  According to the brake master cylinder mounting structure of the present invention, the dashboard lower and the master cylinder stiffener exhibit high rigidity, so that the brake operation feeling can be reliably improved even when applied to a bent dashboard lower. it can.

  Hereinafter, embodiments of a brake master cylinder mounting structure according to the present invention will be described in detail with reference to the drawings as appropriate. In the drawings to be referred to, FIG. 1 is a perspective view of a brake master cylinder mounting structure according to an embodiment, and is a view seen from the vehicle interior side. FIG. 2 is an explanatory diagram of the configuration of the master cylinder stiffener, and is a view of the master cylinder stiffener viewed from the vehicle interior side. 3 is a cross-sectional view taken along the line III-III in FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. In the following description, the front / rear / left / right / up / down directions coincide with the front / rear / left / right / up / down directions of the automobile in which the brake master cylinder mounting structure is used, and the front / rear / left / right / up / down directions in FIG.

  As shown in FIG. 1, the brake master cylinder mounting structure S is for mounting the brake master cylinder 3 on a dashboard lower 2a bent so as to protrude toward the engine room R1, and is disposed on the engine room R1 side. The brake master cylinder 3 and the brake pedal unit 4 arranged on the vehicle compartment R2 side are fastened and fixed with bolts B1. The main feature of the brake master cylinder mounting structure S is that a master cylinder stiffener 1 having the structure described later is disposed on the side of the cabin R2 of the dashboard lower 2a that is bent.

The dashboard lower 2a is a panel material arranged so as to separate the engine room R1 and the vehicle compartment R2, and the upper end edge thereof is connected to the dashboard upper 2b by spot welding or the like. The dashboard lower 2a in the present embodiment is bent so as to protrude toward the engine room R1 below the mounting surface of the brake master cylinder 3 to be described later to form a recess 2c on the vehicle compartment R2 side. Yes. The recessed portion 2c in the present embodiment is formed in a groove shape extending along the vehicle width direction (left-right direction in FIG. 1).
Incidentally, the rear end of the front side frame 5 of the vehicle is connected to the dashboard lower 2a in the present embodiment on the engine room R1 side.

  As is well known, the brake pedal unit 4 mainly includes a brake pedal 4a to which a pedaling force is input and a pedal bracket 4b that supports the brake pedal 4a. The pedaling force on the brake pedal 4a will be described below. It is input to the piston shaft 3 a of the brake master cylinder 3. Incidentally, in the brake pedal unit 4 in the present embodiment, as described above, the pedal bracket 4b is fixed to the brake master cylinder 3 side by the bolt B1 and is fixed to the dashboard upper 2b side by the bolt B2. .

The brake master cylinder 3 is configured to transmit a pedal effort input to the piston shaft 3a via the brake pedal 4a as a hydraulic pressure to a brake system (not shown). The brake master cylinder 3 in the present embodiment includes a hydraulic booster (a booster) (not shown) having a known structure.
The brake master cylinder 3 sandwiches a dashboard lower 2a and a master cylinder stiffener 1 described below between the pedal bracket 4b and is tightened to the dashboard lower 2a by tightening with the bolt B1 described above. It is fixed.

  The master cylinder stiffener 1 in the present embodiment is obtained by subjecting a plate body to uneven processing by press molding, and is attached to the dashboard lower 2a by spot welding from the cabin R2 side as shown in FIG. Yes. As shown in FIG. 2, the master cylinder stiffener 1 has an inverted L-shape so as to avoid a through hole 2d formed in the dashboard lower 2a for inserting a steering shaft (not shown). ing. Incidentally, a shaft mounting hood (not shown) is arranged on the side of the passenger compartment R2 (see FIG. 1) of the through hole 2d (see FIG. 1).

  As shown in FIG. 2, the master cylinder stiffener 1 has a first bead 11 formed along the left end edge thereof and a second bead formed so as to be substantially parallel to the right side of the first bead 11. A bead 12 and a third bead 13 described later are provided. The first bead 11 and the second bead 12 correspond to “a pair of beads” in the claims, and the third bead 13 corresponds to an “enclosure bead”. As shown in FIG. 1, these beads 11, 12, and 13 are formed by bending the plate body by the press molding described above so as to protrude toward the vehicle interior R <b> 2 (see FIG. 1).

  As shown in FIG. 3, the second bead 12 is formed so as to straddle the recessed portion 2c of the dashboard lower 2a. As shown in FIG. 2, the first bead 11 is formed so as to straddle the recessed portion 2 c of the dashboard lower 2 a in the same manner as the second bead 12. That is, the 1st bead 11 and the 2nd bead 12 will straddle the dent part 2c along with right and left. As shown in FIGS. 1 and 3, the first bead 11 and the second bead 12 are extended to a position corresponding to the connecting portion 5a with the rear end of the front side frame 5 (position on the vehicle interior R2 side). ing.

  Further, as shown in FIG. 2, the second bead 12 is formed so that the tightening point P by the bolt B <b> 1 is positioned on the extension line X in the extending direction.

  As shown in FIG. 2, the third bead 13 is formed so as to surround the collar 6 provided at the tightening point P of the bolt B <b> 1. Specifically, it is formed in a U shape in plan view so as to surround four fastening points P. The third bead 13 is connected to the upper end of the second bead 12 at the lower end of the U-shaped open side.

As shown in FIG. 2, the collar 6 is formed in a substantially tubular shape so as to surround the periphery of the bolt B <b> 1 that defines the tightening point P. Incidentally, in the present embodiment, two collars 6 are connected by a coupling piece 6 a to constitute a color unit 7. And the coupling piece 6a is extended so that the extension direction of the 1st bead 11 and the 2nd bead 12 may be met.
As shown in FIG. 3, the collar 6 functions as a spacer that secures a predetermined distance between the pedal bracket 4 b of the brake pedal unit 4 and the master cylinder stiffener 1. And between the pedal bracket 4b and the master cylinder stiffener 1, a soundproof material (illustration omitted) will be arrange | positioned.

  The master cylinder stiffener 1 includes a leg portion 14 between the first bead 11 and the second bead 12 as shown in FIGS. 1 and 2. As shown in FIG. 1, the leg portion 14 is formed by bending the plate body by the above-described press molding so as to be convex toward the engine room R1 side. As shown in FIG. 4, the leg portion 14 is bent so as to follow the shape of the recess portion 2 c formed in the dashboard lower 2 a, thereby contacting the recess portion 2 c.

Next, the function and effect of the brake master cylinder mounting structure S according to this embodiment will be described.
In the brake master cylinder mounting structure S, as shown in FIG. 3, when a load is applied to the pedal bracket 4b according to the pedaling force F applied to the brake pedal 4a, the dashboard lower 2a is formed on the engine room R1 side in the recess 2c. Try to bend. However, the master cylinder stiffener 1 is provided with a first bead 11 and a second bead 12 (see FIG. 2) so as to straddle the recessed portion 2c, and as shown in FIG. 4, the leg portion 14 has a recessed portion. By abutting on 2c, the dashboard lower 2a and the master cylinder stiffener 1 exhibit high rigidity, and deformation at the portion where the recess 2c is formed is prevented. As a result, according to the brake master cylinder mounting structure S, the brake operation feeling can be improved with certainty.

  Further, in this brake master cylinder mounting structure S, as shown in FIG. 2, the second bead 12 is formed so that the fastening point P is positioned on the extension line X in the extending direction. As shown in FIG. 1, even if a through hole 2d for inserting a steering shaft (not shown) is formed in the dashboard lower 2a below the mounting position of the brake master cylinder 3, the dashboard lower 2a The master cylinder stiffener 1 exhibits high rigidity. As a result, according to the brake master cylinder mounting structure S, the brake operation feeling can be improved with certainty.

  Further, in this brake master cylinder mounting structure S, as shown in FIG. 2, when a load is applied to the master cylinder stiffener 1 via the pedal bracket 4b and the collar 6 according to the depression force on the brake pedal 4a, The 3 beads 13 are formed so as to surround the collar 6 provided at the tightening point P, and the second bead 12 is connected to the third bead 13, so that the master cylinder stiffener 1 is arranged around the collar 6. The generated stress is dispersed by being efficiently transmitted to the second bead 12. As a result, according to the brake master cylinder mounting structure S, the strength can be improved.

  Further, in this brake master cylinder mounting structure S, as shown in FIG. 2, the first bead 11 and the second bead 12 are extended to a position corresponding to the connection portion 5a with the rear end of the front side frame 5. The dashboard lower 2a and the master cylinder stiffener 1 exhibit higher rigidity compared to the case where the dashboard lower stiffener 1 is not extended to that position, and the deformation at the portion where the recess 2c is formed is more reliably prevented. . As a result, according to this brake master cylinder mounting structure S, the brake operation feeling can be further improved. As described above, since the third bead 13 and the second bead 12 are connected, the stress generated in the master cylinder stiffener 1 around the collar 6 is also efficiently applied to the rear end side of the front side frame 5. Will be distributed. In particular, the stress generated in the master cylinder stiffener 1 around the collar 6 provided at the fastening point P located on the extension line X in the extending direction of the second bead 12 is more efficiently applied to the rear end side of the front side frame 5. Will be distributed.

The present invention is not limited to the above embodiment, and can be implemented in various forms.
In the above-described embodiment, the master cylinder stiffener 1 has an inverted L shape in plan view so as to avoid the through hole 2d formed in the dashboard lower 2a for inserting the steering shaft (not shown). In the present invention, when the through hole 2d is formed at a position where it does not interfere with the master cylinder stiffener 1, the shape thereof is not limited. FIG. 5 referred to here is a configuration explanatory view showing a modified example of the master cylinder stiffener, and is a view of the master cylinder stiffener viewed from the vehicle interior side. In this modification, the same reference numerals are given to the same components as those in the embodiment, and the detailed description thereof is omitted.

  As shown in FIG. 5, the modified master cylinder stiffener 21 has a rectangular shape in plan view. The second bead 23 is formed along the right edge of the master cylinder stiffener 21, and the upper end of the second bead 23 is connected to the lower end of the third bead 13 on the closed side of the U-shape. Incidentally, the second bead 23 is formed so as to straddle the recess 2c of the dashboard lower 2a. And the leg part 24 formed between the 1st bead 11 and the 2nd bead 22 is contact | abutting to the recessed part 2c.

  Further, in the embodiment, as shown in FIG. 2, four tightening points P are set corresponding to the number of bolts B1, but the number and positions of the tightening points P are the same as the number of bolts B1. Needless to say, it varies depending on the arrangement. At this time, it is preferable that the second bead 12 is formed so that at least one fastening point P is positioned on the extension line X.

It is the perspective view of the brake master cylinder attachment structure which concerns on embodiment, Comprising: It is the figure seen from the vehicle interior side. FIG. 3 is a diagram illustrating the configuration of a master cylinder stiffener, and is a view of the master cylinder stiffener viewed from the vehicle interior side. FIG. 3 is a sectional view taken along line III-III in FIG. 2. It is IV-IV sectional drawing of FIG. It is composition explanatory drawing which shows the modification of a master cylinder stiffener, Comprising: It is the figure which looked at the master cylinder stiffener from the vehicle interior side. It is sectional drawing of the conventional attachment structure which attached the pedal bracket using the stiffener.

Explanation of symbols

1 Master Cylinder Stiffener 2a Dashboard Lower 2c Recess 3 Brake Master Cylinder 5 Front Side Frame 6 Color 11 First Bead (Bead)
12 Second bead
13 Third bead
14 Leg P Tightening point R1 Engine room R2 Car compartment S Brake master cylinder mounting structure X Extension line

Claims (3)

The dashboard lower is bent to the engine room side below the mounting surface of the brake master cylinder and has a recess on the vehicle compartment side.
The recessed portion is formed in a groove shape extending along the vehicle width direction, and the rear end of the front side frame of the vehicle is connected to the dashboard lower on the engine room side,
Master cylinder stiffener mounted from the cabin side to the dashboard lower is, formic straddling the recessed portion up and down, which is a pair formed in the left and right so as to be extended to a position corresponding to the connecting portion of the front side frame With beads,
A leg that abuts against the recess between the beads ,
The leg portion is formed by bending a plate so as to be convex toward the engine room side, and the leg portion is bent so as to follow the shape of the recess portion formed in the dashboard lower. Therefore, the brake master cylinder mounting structure is in contact with the recess .   2. The brake according to claim 1, wherein at least one of the pair of beads is formed so that a tightening point of the brake master cylinder is positioned on an extension line in the extending direction. Master cylinder mounting structure.   The master cylinder stiffener further includes an enclosure bead formed so as to surround a collar provided at a tightening point between the master cylinder stiffener and the brake master cylinder via the dashboard lower. The brake master cylinder mounting structure according to claim 1, wherein the brake master cylinder is connected to at least one of the pair of beads.

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