JP2000062606A - Parking brake device - Google Patents

Abstract

(57) [Problem] To provide a crank-shaped parking brake bracket capable of securing sufficient rigidity, effectively suppressing deformation in a diagonally rearward direction, and having good press formability without causing material deterioration. A parking brake device having the same. SOLUTION: A base plate portion 6a arranged along the left-right direction of the vehicle body, and a pair of left and right sides bent at opposite left and right ends of the base plate portion 6a and arranged along the front-rear direction of the vehicle body. It has bent plate portions 6b and 6c, respectively, and forms corner portions C ₁ and C ₂ between the base plate portion 6a and the bent plate portions 6b and 6c into an arc-shaped cross section, and also has these corner portions C ₁ , mounting the parking brake bracket 6 of a crank shape formed by gradually allowed change the curvature of C ₂ in the vertical direction to the floor panel, the base plate portion of the parking brake bracket 6 cable 5 for the parking brake to be linked to the braking mechanism 3 of the wheel 6a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a parking brake device for continuously applying a braking force to a wheel by operating a brake mechanism when a vehicle is parked or stopped for a long time, and more specifically, a parking brake cable. The present invention relates to an improvement of a parking brake bracket that supports a vehicle.

[0002]

2. Description of the Related Art One of the components of a parking brake device
One of the parking brake brackets is shown in Fig. 4.
The shapes shown in FIGS. 5 and 6 have been conventionally used. Parking brake bracket 2 of FIG.
0 is a base plate portion 21 arranged along the lateral direction of the vehicle body
And a pair of left and right bent plate portions 22a, 22b that are bent in the same direction (front side of the vehicle body) at both left and right ends of the base plate portion 21 and are arranged along the front-rear direction of the vehicle body.
And a flange bracket 23a, 23b formed by bending at the lower ends of the pair of bent plate portions 22a, 22b are welded to a floor panel (not shown) of the vehicle body by spot welding S. The parking brake bracket 20 is mounted on the floor panel by connecting them. On the other hand, the parking brake bracket 30 of FIG. 5 is bent in opposite directions (vehicle rearward direction) at the base plate portion 31 arranged along the vehicle body left-right direction and at both left and right end portions of the base plate portion 31. A crank-shaped bracket having a pair of left and right bent plate portions 32a and 32b arranged along the front-rear direction of the vehicle body, and a flange piece 33a formed at the lower end of the bent plate portion 32a and the base plate portion 31, and a bent piece. A bent flange piece 33b is provided at the lower end of the plate portion 32b. Thus, the two bolts B ₁ , are inserted in the bolt insertion holes 34a, 34b formed in the bent plate portions 32a, 32b.
By inserting B ₂ (see FIG. 8) and fastening it to the floor panel of the vehicle body, the parking brake bracket 3
0 is mounted on the floor panel.

Further, cable insertion holes 25, 35 are provided in the base plate portions 21, 31 of the parking brake brackets 20, 30 for inserting and arranging a parking brake cable (not shown) linked to a wheel brake mechanism. Is provided, and the parking brake cable 36 (see FIG. 6) is inserted and arranged in the cable insertion holes 25 and 35, and is attached by means such as a double nut (not shown). Cable is supported.

FIG. 6 shows a state in which the packing brake cable 36 is attached to the crank-shaped parking brake bracket 30. In this case, the reinforcing plate 37 is provided at the central portion of the base plate portion 31 of the parking brake bracket 30 and at the position corresponding to the periphery of the cable insertion hole 35, by the positioning bosses 41, 4 of the base plate portion 31.
2 is mounted in a positioned state by using the rear wheel brake mechanism and parking brake pedal (neither is shown)
Parking brake cable 3 hung between and
An intermediate portion of 6 is engaged with and supported by the parking brake bracket 30 by a predetermined engaging member (double nut or the like).

An arrow F in FIGS. 4 to 7 indicates a force acting on the parking brake brackets 20, 30 when the parking brake cable 36 is pulled to operate the parking brake (a load toward the rear of the vehicle body). Is shown. The load F applied to the parking brake brackets 20 and 30 is a reaction force of the load pulling the wire (inner cable) of the parking brake cable 36 when the driver depresses the parking brake pedal. The load F is supported by _two bolts B ₁ and B ₂ for attaching a spot welded portion connected to the panel or the parking brake bracket 30 to the floor panel of the vehicle body.

[0006]

By the way, in the crank-shaped parking brake bracket 30 with the two bolts tightened as shown in FIGS. 5 and 6, the parking brake bracket 20 having a U-shape as shown in FIG. Compared with this, the rigidity is low, and there is a problem that the driver feels a depression when the parking brake pedal is depressed to apply the parking brake or a rotation operation feeling when the parking brake lever is rotated. The details are as follows.

That is, in the case of the U-shaped parking brake bracket 20, there is a deformation mode (deformation state) in which the load F generated when the parking brake cable is pulled is evenly shared and the vehicle falls to the rear side of the vehicle body. Become. On the other hand, in the case of the crank-shaped parking brake bracket 30, when the parking brake cable is pulled, the deformation mode indicated by the arrow f ₀ in FIG. 7, that is, the deformation mode in which the parking brake cable falls down diagonally rearward of the vehicle body is used. The stress concentrates on the portions indicated by symbols α, β and γ. Further, as shown in FIG. 8, the flange pieces 33a and 33b of the parking brake bracket 30 are arranged in a state of being floated with respect to the floor panel 40 so that the flange pieces 33a and 33b do not hit the floor panel 40 of the vehicle body and no abnormal noise is generated. For this reason, when the parking brake bracket 30 is attached to the floor panel 40 with the _two bolts B ₁ and B ₂ , the oblique rearward deformation mode becomes large as described above. For this reason, there is a problem that the feeling of stepping on the parking brake pedal or the feeling of turning operation of the parking brake lever becomes poor.

Further, in the case of the crank-shaped parking brake bracket 30, the flange portion (corner portion between the base plate portion 31 and the bending plate portions 32a and 32b and the corresponding flange portion α) indicated by the symbol α in FIG. Since the parking brake bracket 30 is an important part for ensuring the rigidity as a whole, the flange part α cannot be omitted. However, since the flange portion α is a portion that becomes a narrowed portion during the press forming of the parking brake bracket 30 and cracks are likely to occur during the press forming, the flange portion α may deteriorate in material after the press forming. There is.

The present invention has been made in view of the above problems, and an object thereof is to ensure sufficient rigidity and to effectively suppress diagonal rearward deformation, and further, press formability. It is an object of the present invention to provide a parking brake device having a crank-shaped parking brake bracket that is good in quality and does not cause material deterioration.

[0010]

In order to achieve the above-mentioned object, in the present invention, the base plate portion arranged along the lateral direction of the vehicle body and the left and right end portions of the base plate portion are directed in opposite directions. And a pair of left and right bent plate portions that are bent along the vehicle body front-rear direction, respectively, and a corner portion between the base plate portion and the bent plate portion is formed into an arcuate cross-section. A crank-shaped parking brake bracket, which is formed by gradually changing the curvature of a corner portion having an arcuate cross section in the vertical direction of the corner portion, is attached to a floor panel of a vehicle body, and a parking brake cable linked to a wheel brake mechanism is attached to the parking portion. It is adapted to be engaged with the base plate portion of the brake bracket. Further, in the present invention, the curvature radius of the corner portion is set to gradually increase from the upper side of the corner portion toward the lower side thereof. Further, in the present invention,
A step portion for attaching a reinforcing plate is formed on a base plate portion of the parking brake bracket which is an engaging portion of the parking brake cable. Further, in the present invention, a bending piece for positioning for positioning and mounting the reinforcing plate is provided at the upper end portion of the base plate portion of the parking brake bracket which is the engaging portion of the parking brake cable.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS.

FIG. 1 shows a parking brake device for a four-wheeled vehicle according to an embodiment of the present invention. The parking brake device is a parking brake lever 1 or a parking brake pedal 2 as a parking brake operating means. And a parking brake cable 5 linked to a brake mechanism 3 of the rear wheel of a four-wheeled vehicle (such as a brake caliper that applies a braking force to the brake disc 4), and a parking brake bracket 6 that supports the parking brake cable 5. And have respectively.

When the parking brake lever 1 is used as the parking brake operating means, the parking brake lever 1 is rotatably mounted on the floor panel between the driver's seat and the passenger seat, and the parking brake lever 1 is also provided. A parking brake bracket 6 is mounted on the floor panel near the location. The parking brake cable 5 is attached to the parking brake bracket 6 by a double nut (not shown) or the like, and the inner cable (wire) is connected to the parking brake lever 1.
When the parking brake pedal 2 is used as the parking brake operating means, the parking brake bracket 6 is mounted on the floor panel between the driver's seat and the passenger's seat, and the rear wheel brake mechanism 3 and the parking brake pedal 2 are used. An intermediate portion of the parking brake cable 5 that is bridged between the and is attached to the parking brake bracket 6. Thus,
When the parking brake lever 1 is rotated or the parking brake pedal 2 is stepped on, the inner cable of the parking brake cable 5 is pulled and the brake mechanism 3 of the rear wheel is operated. .

The parking brake bracket 6 used in this embodiment has a base plate portion 6a arranged along the left-right direction of the vehicle body, and is bent at opposite left and right end portions of the base plate portion 6a in opposite directions. It has a pair of left and right bent plate portions 6b and 6c arranged along the front-rear direction, and each has a cross section of corners C ₁ and C ₂ between the base plate portion 6a and the bent plate portions 6b and 6c. It is a crank-shaped member formed in an arc shape. Further, the flange pieces 6 made of bent pieces are provided at the lower ends of the bent plate portions 6b and 6c.
d and 6e are provided as mounting pieces, and one flange insertion hole (mounting hole) 7 and 8 is formed in each of the flange pieces 6d and 6e. The parking brake bracket 6 is configured such that the curvatures of the corner portions C ₁ and C _{2 having} an arcuate cross section gradually change (gradually change) in the vertical direction of the corner portions C ₁ and C _2. As described above, the parking brake cable 5 linked to the brake mechanism 3 for the rear wheel is attached to the base plate portion 6a of the parking brake bracket 6.

More specifically, the above-mentioned corner
Part C₁, C₂Regarding the radius of curvature at each corner
Part C₁, C₂From the upper side to the lower side in
Corner radius C₁, C₂Above
It gradually increases continuously from the bottom
Is set. That is, as clearly shown in FIG.
At the corner C₁, C₂The radius of curvature at the top end of
Smaller radius R₁Set to (relatively sharp curve)
The radius of curvature at the lowest end is relatively large
Curvature radius R₂Set to (relatively gentle curve)
(R₁<R₂), Corner C₁, C₂From above to below
The radius of curvature is R toward the side₁To R ₂Up to
And is formed so that it gradually becomes larger.

Further, in the present embodiment, as shown in FIG. 2, a step portion 9 for attaching a reinforcing plate is formed on the base plate portion 6a of the parking brake bracket 6 which is an engaging portion of the parking brake cable 5. ing. The step portion 9 is formed along the area surrounding the cable insertion hole 14 formed in the base plate portion 6a. Thus, a reinforcing plate (not shown) is fitted in the concave portion 10 surrounded by the step portion 9 and fixed to the base plate portion 6a. Further, triangular pillar-shaped corner beads 11 and 12 are provided for reinforcement at bent portions (corner portions) between the bent plate portions 6b and 6c of the parking brake bracket 6 and the flange pieces 6d and 6e.

According to the parking brake device having such a structure, the press formability of the parking brake bracket 6 can be improved, and sufficient rigidity can be ensured even with the crank-shaped parking brake bracket 6. Therefore, it is possible to prevent the occurrence of the deformation mode in which the deformation mode is slanted backward. That is, in order to improve the press formability of the parking brake bracket 6, the curvature radius of the corner portions C ₁ and C ₂ may be set to R ₁ = R ₂ to increase the curvature radius as a whole. In addition, the rigidity decreases as the bending radius increases. On the other hand, in this embodiment, as described above, the curvatures at the corner portions C ₁ and C ₂ are R ₁ <R ₂
The corners C ₁ , C ₂
Since the bending radius R ₂ at the lower end portion of the parking brake bracket 6 is set to be large, it is necessary to secure the rigidity at the flange portion α (see FIG. 2) at the lower end of the corner portions C ₁ and C ₂ when the parking brake bracket 6 is manufactured. It is possible to prevent material deterioration and cracks from occurring in important parts, and it is possible to improve press formability during manufacturing of the parking brake bracket 6. Moreover, in the present embodiment, the curvature radius of the portion above the lower end portions of the corner portions C ₁ and C ₂ is set to be smaller than the curvature radius R _2, so sufficient rigidity is secured. It becomes possible.

Further, the parking brake bracket 6
Since the step portion 9 is provided on the base plate portion 6a, the presence of the step portion 9 can improve the rigidity of the parking brake bracket 6 in the vehicle front-rear direction. Moreover, when attaching the reinforcing plate (not shown) to the base plate portion 6a, the step portion 9 can function as a positioning guide for the reinforcing plate, and can prevent lateral displacement of the reinforcing plate. The workability of assembling the reinforcing plate to the base plate portion 6a can be improved.

On the other hand, if the parking brake bracket 6 is deformed in the lateral direction (horizontal direction of the vehicle body), it interferes with other parts around it, which is not preferable, but the bent plate portions 6b, 6c of the parking brake bracket 6 are not preferable. Since triangular bead-shaped corner beads 11 and 12 are provided at the bent portions (corner portions) between the flange pieces 6d and 6e, the crank-shaped parking brake bracket 6 is provided due to the presence of these corner beads 11 and 12.
The structure can effectively prevent lateral deformation of the.

Although one embodiment of the present invention has been described above, the present invention is not limited to this embodiment.
Various modifications and changes can be made based on the technical idea of the present invention. For example, as shown in FIG. 3, positioning is performed at the upper end of the base plate portion 6a of the parking brake bracket 6 which is the engaging portion of the parking brake cable 5, and is surrounded by the step portion 9 described above. A bending piece (bending flange) 15 may be provided and the bending piece 15 and the step portion 9 may be used for positioning the reinforcing plate. In this case, the positioning bosses 41 and 42 (see FIG. 6) that have been conventionally provided can be omitted.

[0021]

According to the present invention as set forth in claim 1, the base plate portion arranged along the left-right direction of the vehicle body and the left and right end portions of the base plate portion are bent in opposite directions to each other in the front-back direction of the vehicle body. Has a pair of left and right bent plate portions arranged along each other, and the corner portion between the base plate portion and the bent plate portion is formed into an arc-shaped cross section, and the curvature of the corner portion having the arc-shaped cross section is formed. Install a crank-shaped parking brake bracket that gradually changes in the vertical direction of the corner on the floor panel of the vehicle body, and attach the parking brake cable linked to the wheel brake mechanism to the base plate of the parking brake bracket. Since it has been designed with a crank-shaped parking brake bracket, it has good press formability and sufficient rigidity. It is possible to support the rake cable can parking brake bracket during pulling of the cable parking brake to prevent the occurrence of defects such as deformed obliquely rearward. As a result, it is possible to avoid a situation in which the feeling of depressing the parking brake pedal and the feeling of rotating the parking brake lever are deteriorated.

Further, according to the present invention as set forth in claim 2, the curvature radius of the corner portion is set so as to gradually increase from the upper side of the corner portion toward the lower side thereof. Preventing material deterioration at this corner by increasing the radius of curvature of the corner at the flange portion at the lower end of the corner portion, which is important for the rigidity of the bracket, that is, at the portion corresponding to the flange portion that becomes the drawing portion during press molding. As a result, it is possible to prevent cracks and the like from occurring, and the press formability of the parking brake bracket can be improved. Further, the lower end portion of the corner portion has a large bending radius, but is gradually changed so that the bending radius becomes smaller on the upper side thereof, so that the rigidity of the parking brake bracket can be sufficiently increased. is there.

Further, according to the present invention as defined in claim 3, the step portion for attaching the reinforcing plate is formed on the base plate portion of the parking brake bracket which is the engaging portion of the parking brake cable. The workability of assembling the reinforcing plate to the base plate portion can be improved, and the rigidity of the base plate portion and thus the entire parking brake bracket can be improved due to the presence of the step portion.

Further, the present invention according to claim 4 is a bending piece for positioning for positioning and attaching a reinforcing plate to an upper end portion of a base plate part of a parking brake bracket which is an engaging part of a parking brake cable. Since the positioning plate is provided, the reinforcing plate can be easily and quickly assembled by the positioning function of the reinforcing plate by the bending piece for positioning and the stepped portion described above, and the positioning of the reinforcing plate in the conventional method can be performed easily. Therefore, it is not necessary to provide the positioning boss that is provided on the base plate portion.

[Brief description of drawings]

FIG. 1 is a perspective view showing a parking brake device according to an embodiment of the present invention.

FIG. 2 is a perspective view of a parking brake bracket used in the parking brake device of FIG.

FIG. 3 is a perspective view showing a modified example of a parking brake bracket.

FIG. 4 is a perspective view of a U-shaped parking brake bracket used in a conventional parking brake device.

FIG. 5 is a perspective view of a crank-shaped parking brake bracket used in a conventional parking brake device.

FIG. 6 is an exploded perspective view of a parking brake bracket disposition portion of a conventional parking brake device.

FIG. 7 is a plan view for explaining a deformation direction of a crank-shaped parking brake bracket used in a conventional parking brake device.

FIG. 8 is a cross-sectional view seen from the direction indicated by arrow X in FIG.

[Explanation of symbols]

1 Parking Brake Lever 2 Parking Brake Pedal 3 Brake Mechanism 5 Parking Brake Cable 5 6 Parking Brake Bracket 6a Base Plate 6b, 6c Bending Plate 6d, 6e Flange Piece 7, 8 Bolt Insertion Hole 9 Step 10 Recess 11, 12 Corner bead 15 Bending piece for positioning (bending flange) C ₁ , C ₂ Corner part α Flange part

Claims (4)

[Claims] 1. A base plate part arranged along the left-right direction of a vehicle body, and a pair of left and right bent parts which are bent along opposite directions at left and right end portions of the base plate part in opposite directions. A corner portion between the base plate portion and the bent plate portion is formed in an arc cross section, and the curvature of the corner portion having the arc cross section is gradually increased in the vertical direction of the corner portion. It is characterized in that a crank-shaped parking brake bracket formed by changing the above is attached to a floor panel of a vehicle body, and a parking brake cable linked to a wheel brake mechanism is attached to a base plate portion of the parking brake bracket. Parking brake device. 2. The parking brake device according to claim 1, wherein the radius of curvature of the corner portion is set to gradually increase from the upper side of the corner portion toward the lower side thereof. 3. The parking brake according to claim 1, wherein a step portion for mounting a reinforcing plate is formed on a base plate portion of the parking brake bracket which serves as an engaging portion of the parking brake cable. apparatus. 4. A positioning bending piece for positioning and mounting a reinforcing plate is provided at an upper end portion of a base plate part of the parking brake bracket which is an engaging part of the parking brake cable. The parking brake device according to claim 3.