JP4555519B2 - Anchor block for vehicle parking brake - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle parking brake, and more particularly to an improvement in an anchor block that is integrally fixed to a vehicle body side member and that a brake shoe pressed against a rotating drum is brought into contact with.
[0002]
[Prior art]
(a) A backing plate that is integrally fixed to the vehicle body in a posture that is substantially perpendicular to the rotational axis of the wheel, and (b) each has a substantially arc shape that can be expanded to the backing plate. A pair of brake shoes disposed; and (c) the brake shoes are disposed across the pair of brake shoes, and the pair of brake shoes are mechanically moved by rotating the brake lever in one direction. (D) a strut disposed between the other ends of the pair of brake shoes; and (e) a vehicle body side member in the vicinity of the expansion mechanism. For a duo-servo type vehicle having an anchor block fixed to the rotary drum, and one of a pair of brake shoes pressed against the rotary drum by the spreading mechanism is brought into contact with the rotation of the rotary drum parking Rake is known.
[0003]
3 to 5 are examples of a drum-in disc brake in which a parking brake drum brake is incorporated in the disc brake, which is for the right rear wheel. FIG. 3 is a front view, and the right side is the front side of the vehicle. It is. 4 is a view corresponding to the IV-IV cross section in FIG. 3, and FIG. 5 is a view corresponding to the VV cross section in FIG. In these figures, the backing plate 10 is integrally fixed to the vehicle body side member in a posture that is substantially perpendicular to the rotational axis of the wheel (not shown). A pair of first brake shoes 12 and second brake shoes 14 having an arc shape are arranged vertically along the left and right outer peripheries, and are held by shoe hold-down devices 16 and 18 so as to be expandable. ing. A toggle type expansion mechanism 20 and a tension coil spring 22 as a return spring are disposed substantially horizontally between one end of the brake shoes 12 and 14, specifically between the upper ends. On the other hand, a strut 24 and a tension coil spring 26 are disposed substantially horizontally between the other ends. The strut 24 is provided with a shoe gap adjusting mechanism, and can be expanded and contracted in the axial direction by a screw.
[0004]
The expansion mechanism 20 is a floating type that is movable with respect to the backing plate 10, and includes a first lever member 32 and a second lever member 34 that are connected to each other by a connecting pin 30 so as to be relatively rotatable. The pins 30 are arranged in a posture that is substantially parallel to the backing plate 10. The first lever member 32 is composed of two metal plates, and one end side connected to the connecting pin 30 is integrally overlapped so as to be in close contact with each other and is engaged with the first brake shoe 12. An engaging portion (concave portion) 36 is provided, and the other end portions are spaced apart from each other by a predetermined dimension, and a cable hooking portion 38 is provided. The hooking portion fixed to the tip of the parking brake cable 40 is provided. The stop member 42 is hooked. The second lever member 34 is formed by bending a single metal plate into a substantially U shape. The first lever member 32 is disposed on the inside of the second lever member 34, and the other end opposite to the connecting pin 30 is provided at the other end. An engagement portion (concave portion) 48 that is bent inward so as to be in close contact with each other and is integrally overlapped with the second brake shoe 14 is provided. The first lever member 32 is provided with a leaf spring 50 bent in a predetermined shape, and guides the parking brake cable 40 to the cable latching portion 38 of the first lever member 32, and once the cable latching portion. The latch member 42 inserted into the plate 38 is prevented from being detached. The first lever member 32 corresponds to a brake lever.
[0005]
The expansion mechanism 20 includes a plurality of (two in this example) bolts 52 that integrally fix the anchor block 54 together with a backing plate 10 to a vehicle body member (not shown) such as an axle housing or a suspension device. The anchor block 54 and the backing plate 10 are provided with insertion holes 56 and 57 for allowing the parking brake cable 40 to pass therethrough. The cable hooking portion 38 is positioned at a portion substantially coinciding with the insertion holes 56 and 57 in a direction substantially perpendicular to the backing plate 10, and the parking brake cable 40 is connected to the vehicle body side (upper side in FIG. 4). By being inserted into the insertion holes 56 and 57, the hook member 42 at the tip is moved while being guided by the leaf spring 50 and hooked to the cable hook portion 38. The anchor block 54 has a substantially L-shaped cross section, and a bolt 52 is integrally press-fitted and fixed to a fixed portion 54 a provided with an insertion hole 56, and a nut is screwed to the bolt 52. Accordingly, the anchor portion 54b that rises at a substantially right angle from the upper end of the fixed portion 54a and is substantially perpendicular to the backing plate 10 has a pair of brake shoes 12. , 14 are positioned between the upper ends of the two.
[0006]
Then, the parking brake cable 40 hooked on the cable hooking portion 38 is pulled in the direction of action F substantially perpendicular to the backing plate 10 according to the operation of the operation member (operation lever, etc.) in the vehicle compartment, that is, upward in FIG. Then, the first lever member 32 is rotated clockwise around the connecting pin 30 to push the first brake shoe 12 outward (rightward in FIG. 4), and the drum portion of the disc rotor 60 that rotates with the wheels. It is pressed by the inner peripheral surface of 60b. Further, when the connecting pin 30 is moved to the left in FIG. 4 with the engaging portion 36 with the first brake shoe 12 as a fulcrum by the reaction force, the second lever member 34 is also moved to the left, and the second brake The shoe 14 is pushed outward and pressed against the inner peripheral surface of the drum portion 60b. In this state, when the disc rotor 60 tries to rotate together with the wheel, either one of the brake shoes 12 or 14 is brought into contact with the anchor portion 54b of the anchor block 54 in accordance with the rotation direction, and further rotation is prevented. As a result, braking force is generated in a duo-servo manner. The disc rotor 60 is integrally provided with a cylindrical (hat-shaped) drum portion 60b inside a flat disc portion 60a, and the drum portion 60b corresponds to a rotating drum. In FIG. 3, the disk rotor 60 is omitted. A dust cover 58 extending to the outer peripheral side is integrally attached to the backing plate 10.
[0007]
[Problems to be solved by the invention]
However, since the anchor block 54 of such a conventional parking brake for a vehicle is generally made by hot forging or casting, there is a problem that the manufacturing cost becomes high.
[0008]
The present invention has been made against the background of the above circumstances, and an object of the present invention is to provide an anchor block that can be manufactured easily and inexpensively.
[0009]
[Means for Solving the Problems]
In order to achieve such an object, the first invention integrally includes a fixed portion integrally fixed to the vehicle body side member, and an anchor portion that rises at a substantially right angle from one end of the fixed portion. cross section has a substantially L-shape, a anchor block of one end vehicle parking brake is brought into contact with the anchor portion of the brake shoe is pressed against the rotating drum during operation of the parking brake, (a And (b) the radius of curvature r ₁ , r ₂ on the outer peripheral side and inner peripheral side of the bent portion of the L-shape. However , the anchor portion side is swept so that the thickness d _{2 of the} metal plate is smaller than the original plate thickness d ₁ and the thickness d _{2 of the} anchor portion is larger than the original plate thickness d _1. On the other hand, (c) the fixed portion includes the vehicle body side portion. There is provided a mounting hole through which a bolt for integrally fixing the bolt is inserted, and the head of the bolt is seated on the upper surface of the fixing portion and at the peripheral edge of the mounting hole. A flat seating surface is formed by coining .
[0011]
The second invention is the anchor block of the first shot Ming parking brake for vehicles, said parking brake for a vehicle, integrally fixed to the vehicle body in a posture to be substantially perpendicular to the rotation axis of (a) a wheel A backing plate, (b) a pair of brake shoes each of which has a substantially arc shape and is arranged to be expandable on the backing plate, and (c) opposite ends of the pair of brake shoes A floating expansion mechanism that is disposed across the brake lever and mechanically separates the pair of brake shoes and presses the rotary drum by rotating the brake lever in one direction. d) struts disposed across the other ends of the pair of brake shoes, (e) the anchor block is disposed in the vicinity of the expansion mechanism, and the expansion By mechanism One of the pair of brake shoes that are pressed against the serial rotary drum by being brought into contact with the rotation of the rotary drum, is characterized in that to generate the braking force as a duo-servo brake.
[0012]
【The invention's effect】
Such an anchor block of a parking brake for a vehicle is configured by a metal plate that is bent so that the cross section has a substantially L shape, and thus is simple and inexpensive. Because it is used for parking brakes, the braking force is small compared to regular brakes, and the braking force is applied less frequently, so even a metal plate such as iron can provide practically sufficient strength and durability. is there.
[0013]
Further, since the curvature radii r ₁ and r ₂ on the outer peripheral side and the inner peripheral side of the L-shaped bent part are made smaller than the original plate thickness d ₁ by the upsetting process, the dimension of the fixed part is reduced. While maintaining a small size, the mounting area for the vehicle body side member can be increased to ensure the necessary and sufficient fixing strength , and the seat surface on which the bolt head can be seated can be formed with a sufficient size. Further, since the anchor portion side is swept up and the thickness d ₂ of the anchor portion is made larger than the original plate thickness d ₁ and thicker than the fixed portion, the thickness of the fixed portion and the anchor portion is increased. The thickness can be optimized based on strength and weight reduction.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
The present invention is suitably applied to a vehicle parking brake that generates a braking force in a duo-servo manner as shown in FIGS. 3 to 5. For example, an anchor block is disposed on the side opposite to the expansion mechanism, With one end of the pair of brake shoes positioned by the anchor block, the other end is separated by the expansion mechanism, and the leading / trailing brake that generates a braking force by being pressed against the rotating drum, etc. It can be applied to various types of parking brakes.
[0015]
Further, in FIG. 3, the expansion mechanism is arranged in a substantially horizontal posture and is configured to expand the brake shoes provided in the vertical direction on the left and right (front and rear sides of the vehicle). The disposition mechanism of the spreading mechanism and the brake shoe can be appropriately changed.
[0016]
In FIG. 4, the first lever member and the second lever member are connected to each other so as to be relatively rotatable around the connecting pin at one end, and the first lever member is engaged with one of the pair of brake shoes on the one end. The second lever member is engaged with the other brake shoe on the opposite other end side. For example, the first lever member and the second lever member are in opposite directions across the connecting pin. It can be extended to engage with a pair of brake shoes.
[0017]
For example, the parking lever is configured to be rotated via an operation member such as a parking brake cable or a link mechanism connected to a parking operation member (lever or pedal) of the driver's seat. Thus, various modes are possible, for example, when a driving source such as an electric motor is operated to be rotated to a predetermined braking position.
[0018]
As the metal plate constituting the anchor block, for example, an inexpensive rolled steel plate or the like is preferably used, and the thickness of the metal plate varies depending on the material, required strength, and the like, but for example, about 5 to 10 mm is appropriate. Can be adjusted by the thickness helical example included processing of the anchor portion and a solid portion, varies depending on the material of the metal plate, Ru can be meat up for example about 40%.
[0019]
In FIG. 4, the mounting bolt is press-fitted and fixed to the anchor block fixed portion so as not to rotate. However, the bolt can be fixed integrally by welding or the like. May be rotatably inserted and screwed into a screw hole or the like of the vehicle body side member.
[0020]
【Example】
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a view showing an anchor block 70 of a vehicle parking brake according to an embodiment of the present invention, which is used in place of the anchor block 54 of the vehicle drum-in-disc brake shown in FIGS. (A) is a plan view corresponding to FIG. 3, (b) is a front view seen from below (a), and (c) is a sectional view taken along the line CC in (a) and corresponds to FIG. To do. The anchor block 70 is obtained by bending an inexpensive metal plate such as a rolled steel plate at a substantially right angle. The anchor block 70 is integrally fixed to the vehicle body side member, and substantially from one end of the fixing portion 72. An anchor portion 74 that rises at a right angle is integrally provided. An insertion hole 72a for inserting the parking brake cable 40 and a pair of mounting holes 72b into which the pair of bolts 52 are press-fitted and fixed. However, it is provided by punching with a press or cutting with a drill. The lower surface 72f of the fixed portion 72 is a flat mounting surface so that the entire surface thereof is substantially in surface contact with the backing plate 10, while the peripheral portion of the mounting hole 72b of the upper surface is formed by coining . A flat seat surface 72c is formed so that the seat surface of the head 52h of the bolt 52 can be brought into surface contact uniformly.
[0021]
Further, after the anchor block 70 is bent at a substantially right angle, the anchor block 70 is swept toward the anchor portion 74 by, for example, a pair of molds 76 and 78 shown in FIG. The curvature radii r ₁ and r ₂ on the side and inner peripheral side are both predetermined dimensions smaller than the original plate thickness d ₁ of the metal plate, and thereby the bottom surface is maintained while keeping the size of the fixed portion 72 small. 72f, that is, the area of the mounting surface is secured, and a seating surface 72c having a predetermined size can be formed. Further, the thickness d ₂ of the anchor portion 74 is made larger than the original plate thickness d ₁ so that predetermined strength and durability can be obtained. The wall thickness d ₂ can be increased to, for example, about 40% with respect to the original plate thickness d ₁ .
[0022]
The anchor block 70 according to the present embodiment is composed of a metal plate that is bent so that the cross section has a substantially L shape. Compared to the case of manufacturing by forging or casting, the manufacturing cost is reduced by about 30 to 40%. Since it is for a parking brake, the braking force is smaller than that of a service brake, and the braking force is applied less frequently. Even a metal plate can provide practically sufficient strength and durability.
[0023]
In this embodiment, since the curvature radii r ₁ and r ₂ of the L-shaped bent portion 80 are both smaller than the original plate thickness d ₁ by swaging, the dimensions of the fixed portion 72 are set. The mounting area (lower surface 72f) with respect to the vehicle body side member is increased while maintaining a small size, and a necessary and sufficient fixing strength can be obtained, and a sufficiently large seating surface 72c can be secured and the posture of the bolt 52 is stabilized. Positioning is performed, and loosening due to posture change or the like is prevented.
[0024]
Further, since the anchor portion 74 side is swept and the thickness d ₂ of the anchor portion 74 is thicker than that of the fixed portion 72, the thickness d ₁ , d _{2 of the} fixed portion 72 and the anchor portion 74 is increased . Can be optimized based on strength and weight reduction.
[0025]
As mentioned above, although the Example of this invention was described in detail based on drawing, this is an embodiment to the last, and this invention implements in the aspect which added various change and improvement based on the knowledge of those skilled in the art. Can do.
[Brief description of the drawings]
1A and 1B are views showing an anchor block of a parking brake for a vehicle according to an embodiment of the present invention, wherein FIG. 1A is a plan view, FIG. 1B is a front view, and FIG. FIG.
FIG. 2 is a view for explaining upsetting when manufacturing the anchor block of FIG. 1;
FIG. 3 is a schematic front view of a conventional drum-in-disc brake in which the anchor block of the present invention is preferably used.
4 is a cross-sectional view taken along line IV-IV in FIG.
5 is a cross-sectional view taken along line VV in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10: Backing plate 12, 14: Brake shoe 20: Expansion mechanism 24: Strut 32: 1st lever member (brake lever) 34: 2nd lever member 60b: Drum part (rotating drum) 70: Anchor block 72: Fixing part 72b: mounting hole 72c: seating surface 74: anchor portion 80: bent portion d _1: the original plate thickness d _2: thickness of the anchor portion r _1: the curvature of the outer peripheral side radius r _2: the inner periphery side curvature radius

Claims (2)

A fixed portion that is integrally fixed to the vehicle body side member and an anchor portion that rises at a substantially right angle from one end of the fixed portion, and has a substantially L-shaped cross section. An anchor block of a vehicle parking brake in which one end portion of a brake shoe pressed against the rotating drum when the brake is operated is brought into contact with the anchor portion,
It is composed of a metal plate that is bent so that the cross-section forms a substantially L shape ,
The curvature radii r ₁ and r ₂ on the outer peripheral side and the inner peripheral side of the L-shaped bent portion are both smaller than the original plate thickness d ₁ of the metal plate , and the thickness d _{2 of the} anchor portion is While the anchor portion side is swept so as to be larger than the original plate thickness d ₁ ,
The fixing portion is provided with a mounting hole through which a bolt for integrally fixing to the vehicle body side member is inserted, and on the upper surface of the fixing portion and at the peripheral portion of the mounting hole. An anchor block for a parking brake for a vehicle , wherein a flat seating surface on which the head of the bolt is seated is formed by coining . The vehicle parking brake is
A backing plate that is integrally fixed to the vehicle body in a posture that is substantially perpendicular to the rotational axis of the wheel;
A pair of brake shoes, each of which has a substantially arc shape and is disposed on the backing plate so as to be expandable;
The pair of brake shoes are disposed across opposite ends, and the brake lever is rotated in one direction to mechanically separate the pair of brake shoes to form a rotating drum. A floating expansion mechanism to press,
A strut disposed across the other end of the pair of brake shoes;
The anchor block is disposed in the vicinity of the spreading mechanism, and one of a pair of brake shoes pressed against the rotating drum by the spreading mechanism is applied as the rotating drum rotates. by being allowed to contact, the anchor block of the vehicle parking brake according to claim 1, characterized in that to generate the braking force as a duo-servo brake.

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