JPH0960667A - Drum-in disk brake - Google Patents

Abstract

PROBLEM TO BE SOLVED: To integrate a brake mechanism for improvement in mounting accuracy and reduction in cost. SOLUTION: A drum-in disk brake uses the inside of the hat part of a rotor used in a disk brake as the drum of a drum brake. An anchor part 24 which receives braking force of the drum brake is mounted and a back plate 10 fixed on a knuckle 16 is punched and formed by a press work. A hole 18 in which a hub unit 12 is fitted and fixed is opened when it is formed and a support arm part on which the caliper sliding guide part of a disk brake unit for pinching a rotor is integrally formed. The hub unit 12 with the rotor, the disk brake unit and the drum brake are previously mounted on the back plate 10 to make a module and the module can be removed from the knuckle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a drum-in disc brake device in which a disc brake is used as a regular brake and a drum brake device for a parking brake is incorporated inside a hat portion of a rotor of the disc brake.

[0002]

2. Description of the Related Art A drum-in disc brake device utilizes a space inside a rotor hat portion of a commonly used disc brake, and incorporates a parking brake for performing a braking operation by a shoe with an inner wall surface of the rotor hat as a braking drum. Has been done. In this drum-in disc brake device, a regular disc brake has a support member fixed to the vehicle body side for bearing a braking torque, which is usually fixed by bolting to a mounting bracket formed on the outer edge of the knuckle. It has become so. On the other hand, the parking drum brake has a back plate that is joined and fixed to the end surface of the knuckle, the anchor pin is fixed to this, and a pair of shoes that are swung about the anchor pin are operated to open the legs of the rotor hat. The inner peripheral surface is pressed, and the parking braking torque is supported by the back plate and the knuckle via the anchor pin.

When the drum-in disc brake device constructed as described above is assembled, after mounting the back plate and the hub unit on the knuckle on the vehicle side, the drum brake parts are assembled to the back plate and together with the axle of the hub unit. Mount the rotor on the wheel mounting surface that is integral with the rotating bearing race. After completing the installation around the hub unit in this way,
The support plate equipped with calipers is mounted on the mounting plate provided on the outer peripheral surface of the knuckle on the vehicle body side.

[0004]

By the way, in this type of brake structure, the disc brake unit is attached to the knuckle portion on the vehicle body side by bolting the support, and the rotor is attached from the knuckle via the hub unit. Since they are attached, relative assembling errors are likely to occur, and after attaching them to the vehicle, it is possible to adjust the rotor inclination with respect to the brake unit that causes judder and abnormal noise during braking, uneven wear of the friction pads, etc. was difficult.

Further, since the disc brake unit and the rotor are attached via separate members, it is necessary to perform the work separately when assembling the brake mechanism to the vehicle, which results in the assembly time. There was a sharp rise in costs due to the cost. Similarly, it is necessary to assemble the drum brake independently, and there is a problem that the workability of assembling is poor as the number of parts increases.

Further, from the viewpoint of reducing the number of parts, it is known that the back plate of the drum brake is also used as the support of the disc brake. In this case, the back plate serves as the torque receiving surface of the disc brake. Therefore, it is constructed as a cast structure, and therefore, a mounting surface, a bolt hole, a hole for the spigot portion, and the like are required, which also causes a problem in terms of cost.

In view of the above-mentioned conventional problems, the present invention has as its first object to provide a drum-in disc brake device which improves the accuracy of the relative position between the rotor and the disc brake unit. Secondly, it is an object of the present invention to provide a drum-in disc brake device capable of reducing the number of parts and, in particular, eliminating the cutting work on the back plate to reduce the cost. Thirdly, by modularizing the drum brake and the disc brake, the knuckle, which is the brake mounting portion, can be integrally attached / detached as a brake module, and the assembly workability in the assembly process can be greatly simplified. An object is to provide a braking device.

[0008]

In order to achieve the above object, a drum-in disc brake device according to the present invention comprises:
In a drum-in disc brake device in which the inside of a rotor hat used in the disc brake device is used as a drum of the drum brake device, a back plate fixed to a knuckle is attached with an anchor portion serving as a brake receiver of the drum brake device. The back plate has a possible flat plate structure, and a mounting hole for fitting and fixing the hub unit is drilled in the back plate, and a support part for forming the caliper slide guide part of the disc brake unit for pinching the rotor is integrally extended. It is characterized by what is done.

Secondly, in a drum-in disc brake device in which the inside of the hat portion of the rotor used in the disc brake device is used as a drum of the drum brake device, an anchor portion serving as a brake receiver of the drum brake device is attached. The back plate fixed to the knuckle has a flat plate structure that can be pressed, the mounting hole for fitting and fixing the hub unit is drilled in this back plate, and the caliper sliding guide part of the disc brake unit that pinches the rotor is formed. The support part that is integrally formed is integrally formed, and the hub unit with a rotor, the disc brake unit, and the drum brake are assembled to the back plate in advance to modularize it, and this brake module can be attached to and removed from the knuckle. Characterizing

In such a structure, the back plate is provided with a bent portion serving as a tongue piece, and the bent portion is an anchor portion for receiving the braking force of the drum brake.
The anchor pin for receiving the torque for the shoe of the drum brake can be eliminated. Further, the back plate can be formed as a laminated body of a flat plate and a reinforcing plate, and can reduce the weight by providing a reinforcing effect only to a portion where strength is required.

Further, an insertion hole for a bolt tightening tool that faces a bolt tightening portion of the back plate to the knuckle can be formed through the hub surface of the hub unit so that the tightening operation can be performed from the outside of the vehicle. As a result, the modularized braking device can be attached to and detached from the knuckle, and the assembling workability can be simplified.

[0012]

In the above-structured drum-in disc brake device, the back plate of the drum brake assembled inside the rotor hat also serves as the mounting hole for fitting the hub unit for assembling the rotor and the disc brake support portion. Since it has a flat plate structure, it can be formed by pressing. For this reason, hole processing is performed together with press processing, cutting processing is not required, and the number of processing steps is greatly reduced, and at the same time, the support member dedicated to the disc brake can be eliminated, reducing the number of parts and assembly workability. It will be improved.

Further, according to the present invention, the hub unit including the rotor and the drum brake are assembled on the back plate of the drum brake, and the support portion on which the disc brake caliper sliding guide integrally formed on the back plate is formed. Since the disc brake unit is configured in advance as a brake module, the brake module may be attached to the knuckle of the vehicle body as it is. The inclination of the brake unit with respect to the rotor that causes judder and uneven wear in the disc brake is inspected and adjusted in advance during the module assembly stage, and an assembly error when assembled in a vehicle does not affect the brake device. Therefore, it is possible to reduce the accumulation of mounting errors such as the mounting error of the hub unit to the knuckle, the mounting error of the knuckle and the support, and the mounting error of the hub unit and the rotor, and to reduce the relative position between the rotor and the brake unit. It can be stabilized with high accuracy. Therefore, the parallelism of the friction pad with the rotor surface is less affected.

Further, since the brake mechanism is integrated, it is not necessary to attach a brake component to the vehicle, and since the brake mechanism can be attached to the vehicle through the insertion holes provided in the rotor and the hub unit, the work is simplified and the assembly time is reduced. As a result, the assembly cost can be reduced.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of a drum-in disc brake device according to the present invention will be described in detail below with reference to the drawings.

1 to 4 are explanatory views of a drum-in disc brake device according to the first embodiment. In the drum-in disc brake device according to this embodiment, the hub unit 12 with the rotor and the disc brake unit 14 are sub-assembled to the back plate 10 to which the drum brake parts are assembled, and the entire brake device modularized by the above is described above. The back plate 10 is attached to the knuckle 16 of the vehicle body.

The back plate 10, which serves as an anchor member of the drum brake, is a component fixedly attached to the knuckle 16, as shown in FIG. 2, by punching a thick flat plate by press forming. Is being formed. Then, at the time of molding, the mounting hole 18 of the hub unit 12 is provided at the central portion, the bolt through hole 22 through which the fastening bolt 20 for fixing to the knuckle 16 is inserted around the mounting hole 18, and the anchor pin 24 is mounted. The pin mounting holes 25 are formed at the same time during press working. The back plate 10 also serves as a support member for the disc brake unit 14, and for this reason, the pair of support arms 26, 26 are punched and formed so as to be extended from the outer edge of the plate body. A caliper slide guide mounting hole 28 of the disc brake unit 14 is similarly pre-drilled by pressing at the extension tip of each support arm 26.
A pad guide groove 30 serving as an anchor for the inner pad is formed on the edges of the support arm 26 that face each other. Therefore, the back plate 10 is given a shape required for assembling the brake mechanism by press working, and at the same time, is drilled. Of course, the drawing hole 32 for wiring for operating the drum brake is also processed at the same time.

The brake mechanism is incorporated into the back plate 10 stamped and formed from the thick plate as described above. As shown in FIG. 1, first, the hub mounting hole 18 at the center of the back plate 10 is inserted. The hub unit 12 is fitted and fixed by press fitting. The hub unit 12 has a bearing portion through which the axle shaft is inserted. The hub unit 12 includes an outer race 12a, which is a main part for press-fitting into the back plate 10, and an inner race 12b, through which the axle shaft is fixed.
It is configured to be rotatable by c. In order to attach the hub unit 12 to the back plate 10, a cutout groove is formed in the outer peripheral portion of the outer race 12a to press the end portion of the outer race 12a into the hub mounting hole 18 by spigot fitting. The inner race 12b of the hub unit 12 is the outer race 12a.
The axle shaft is rotatably attached to the outer race 12a. The axle shaft protrudes outward from the tip of the outer race 12a, and a wheel mounting flange 34 is provided on the protruding portion.
Mounting bolts 36 for fixing the wheel are embedded concentrically around the axis. Further, a rotor 38 for braking is attached to the flange 34, and the disc brake unit 14 for braking is arranged by pressing a part of the outer peripheral portion of the rotor 38.

A through hole 40 is formed in the wheel mounting flange 34 and the hat portion 38a of the rotor 38 joined to the wheel mounting flange 34 so that the fastening bolt 20 of the back plate 10 can be screwed from the outside of the vehicle. It is open. A tool for tightening the tightening bolt 20 is inserted through the through hole 40, and the modular braking device of the back plate 10 can be screwed to the knuckle 16. Therefore, the through hole 40 is located on a concentric circle along the arrangement of the female screw formed on the end surface of the knuckle 16, and is provided at one place in the embodiment. When the fastening bolts 20 are screwed onto the plurality of female screws, the rotor 38 may be rotated to align the through holes 40 with the bolts 20.

The back plate 10 is arranged so as to cover the opening portion of the hat portion 38a of the rotor 38, and the drum brake mechanism is incorporated in the back plate 10 by utilizing the internal space of the hat portion 38a. . As shown in FIG. 3, the anchor pin 24 is inserted and fixed in the pin mounting hole 25, and a pair of shoes 42, 42 formed in an arc shape so as to face the inner peripheral surface of the hat portion 38a.
Is attached so that it can be pushed open in the radial direction, and the anchor pin 24 receives the joint friction with the hat portion 38a. In this case, the shoe 42 is the back plate 10
Since the screwing operation of the tightening bolt 20 is performed through the rotor hat portion 38a, the rib shape is set so as not to cover the bolt through hole 22. In this way, the drum brake mechanism parts are assembled in the hat portion 38a,
In order to prevent dust in this built-in space, the back plate 10
The cover 44 is provided on the inner surface of the cover and covers the opening of the hat portion 38a.

A disc brake unit 14 is attached to the back plate 10 and is supported by the pair of support arms 26, 26 described above. This is shown in FIG. As shown in the figure, a guide sleeve 46 which constitutes a caliper sliding guide is attached to each support arm 26 by press fitting. A guide pin 50 is provided on the caliper 48 side of the disc brake unit 14.
And the guide pin 50 is connected to the guide sleeve 46.
By inserting the caliper 48, the movement of the caliper 48 in the axial direction of the rotor is guided. In the disc brake unit 14 used in the embodiment, the inner pad is mounted in the pad guide groove 30 formed in the support arm 26 on the back plate 10 side, and the outer pad is of a type that is attached to the caliper claw by pin engagement. . Therefore, the braking torque is directly transmitted to the support arm 26 on the inner side, and is also transmitted from the caliper guide to the support arm 2 on the outer side through the caliper 48.
6 is transmitted. As a result, the braking torque on the disc brake side is received by the knuckle 16 through the back plate 10 integrally formed with the support arm 26.

In the drum-in disc brake device having such a structure, the disc brake unit 14 for braking and the rotor 38 are both attached to the back plate 10 of the drum brake, so that the knuckles 16 are separately provided. As compared with the case of mounting on the side of the axle and the side of the axle, the mounting error between them is reduced and the mounting accuracy is improved. As a result, the runout of the rotor 38 is reduced,
Uneven wear generated on the friction pad is reduced. Further, the back plate 10 to which the drum brake mechanism parts are assembled
The hub unit 12 to which the rotor 38 is attached.
And the disc brake unit 14 are pre-assembled into one modular braking device,
It can be attached to or removed from the knuckle 16 as a unit. For this reason, the work to put the initial contact of the parking brake on the final assembly line when the vehicle body was completed, etc.,
Work such as performance confirmation can be performed in advance by the brake alone, which can improve the brake reliability by the preliminary adjustment. By integrating the brake components around the back plate 10 into a module, the brake mechanism can be integrated. Therefore, in the vehicle assembly line, the brake mechanism can be provided by simply attaching the brake module to the knuckle 1. It can be easily assembled to the vehicle body by being equipped with the knuckle 16, and by attaching the back plate 10 to the knuckle 16 and inserting the tightening bolt 20 through the through hole 40 and screwing the knuckle 16 into the knuckle 16 as well. When the back plate 10 is fixed to the knuckle 16, if there are a plurality of female screw portions on the knuckle 16 side, the fastening bolts 20 may be screwed to the plurality of female screw portions while rotating the rotor 38 during assembly.

In particular, since the back plate 10 is formed of a flat plate, it can be provided not as a cast product but as a pressed product, and a support portion for drilling or disc brake can be integrally formed. Yes, no cutting is required. This makes it possible to reduce the number of parts, and at the same time, since the processing process is performed only by the press,
The manufacturing workability can be improved.

A second embodiment is shown in FIGS. The first
In the embodiment, the anchor pin 24 constituting the drum brake is used.
Is attached to the back plate 10 to receive the drum brake braking, but the second embodiment is different in that the drum brake anchor portion is formed on the back plate 10 itself having a flat plate structure, instead of the anchor pin 24. That is, the tongue piece 52 is provided corresponding to the anchor forming portion of the back plate 10 at the time of press working, and the tongue piece 52 is bent and formed on the rotor hat portion 38a side so that the braking force from the shoe 26 is supported. It was done.
As a result, there are advantages that the number of parts of the anchor pin 24 is reduced and the work for attaching the anchor pin 24 can be omitted. Since other configurations are similar to those of the first embodiment, the same components are designated by the same reference numerals and the description thereof will be omitted.

Further, FIGS. 8 to 11 show a third embodiment. The third embodiment differs from the first embodiment in that the back plate is a laminated back plate 10A in which thin plates are laminated. That is, in the first embodiment, since the back plate to which the brake mechanism is assembled functions as a torque member, a thick steel plate is stamped and formed, but in the third embodiment, a thin steel plate is stamped and formed. However, in order to obtain the required rigidity, the folded edge portion 54 is formed so that the outer edge portion is orthogonal to the plate surface during molding.
Is formed. Since the braking torque acts along the plate surface of the back plate 10, the folded edge portion 54
As a result, the secondary section modulus is improved, and bending rigidity can be secured.
Then, a planar U-shaped reinforcing plate 56 is laminated and integrated with a support corresponding portion including the support arm 26 of the disc brake unit 14 that requires particularly plate thickness strength, and a braking torque in the regular disc brake unit 14 is obtained. The strength as a member is secured. Since other configurations are similar to those of the first embodiment, the same components are designated by the same reference numerals and the description thereof will be omitted.

In the third embodiment, the back plate 10
Since the basic member of A is pressed by a thin plate, the workability is good, and since the reinforcing plate 56 is laminated and integrated at a necessary portion, the necessary strength can be given only to the necessary portion, whereby the effect of particularly reducing the weight is improved. it can.

Next, FIG. 12 shows a fourth embodiment. This is a modification of the third embodiment, in particular the laminated back plate 1
The back plate 10B is obtained by separating the U-shaped reinforcing plate 54 of 0A into right and left parts, stacking this on a thin plate punching plate, and spot welding. That is, the reinforcing plates 56R and 56L that are separated into the left and right are joined to the attachment points of the caliper guide sleeve 46. In this example, there is an advantage that the weight saving can be further promoted.

[0028]

As described above, according to the present invention, in the drum-in disc brake device, the hub unit with the rotor and the disc brake unit are preassembled into the back plate of the drum brake to form a module, which is then mounted on the vehicle body. Since it can be assembled in module units, it is possible to easily reduce the relative position and runout of the rotor with respect to the brake unit because the adjustment can be made in module units before mounting on the vehicle body. Also, since the back plate has a flat plate structure and the hub unit is fitted in the spigot joint,
The workability of the back plate itself is significantly improved, the drum brake can be easily assembled, and the back plate can be used as a torque member of a disc brake, resulting in excellent effects of reducing the number of parts and reducing weight.

[Brief description of drawings]

FIG. 1 is a sectional view of an assembled structure of a drum-in disc brake device according to a first embodiment.

FIG. 2 is a plan view of the back plate according to the embodiment.

FIG. 3 is a front view showing a state in which a hub unit of the embodiment is removed.

FIG. 4 is a plan view of the same embodiment as seen from the disc brake side.

FIG. 5 is a sectional view of the assembled structure of the drum-in disc brake device of the second embodiment.

FIG. 6 is a plan view of the back plate according to the embodiment.

FIG. 7 is a front view of the embodiment with the hub unit removed.

FIG. 8 is a sectional view of an assembled structure of a drum-in disc brake device according to a third embodiment.

FIG. 9 is a plan view of the back plate of the embodiment.

FIG. 10 is a front view of the embodiment with the hub unit removed.

FIG. 11 is a plan view of the same embodiment as seen from the disc brake side.

FIG. 12 is a front view of the hub unit of the fourth embodiment with the hub unit removed.

[Explanation of symbols]

 10 Back Plate 12 Hub Unit 14 Disc Brake Unit 16 Knuckle 18 Hub Mounting Hole 20 Tightening Bolt 22 Bolt Through Hole 24 Anchor Pin 25 Anchor Pin Mounting Hole 26 Support Arm Part 28 Guide Mounting Hole 30 Pad Guide Groove 32 Cable Pull Out Hole 34 Wheel Mounting Flange 36 Wheel Mounting Bolt 38 Rotor 38a Hat Part 40 Through Hole for Bolt Operation 42 Shoe 44 Dust Cover 46 Guide Sleeve 48 Caliper 50 Guide Pin 52 Anchor Tongue 54 Folded Edge 56 Reinforcement Plate

Claims (5)

[Claims] 1. A drum-in disc brake device in which the inside of a hat portion of a rotor used in the disc brake device is used as a drum of a drum brake device, and an anchor portion serving as a brake receiver of the drum brake device is attached and fixed to a knuckle. The back plate has a flat plate structure that can be press-worked, the mounting hole for fitting and fixing the hub unit is drilled in this back plate, and the support part for forming the caliper sliding guide part of the disc brake unit that clamps the rotor is formed. A drum-in disc brake device characterized by being integrally extended. 2. In a drum-in disc brake device in which the inside of a hat portion of a rotor used in the disc brake device is used as a drum of the drum brake device, an anchor portion serving as a brake receiver of the drum brake device is attached and fixed to a knuckle. The back plate has a flat plate structure that can be press-worked, the mounting hole for fitting and fixing the hub unit is drilled in this back plate, and the support part for forming the caliper sliding guide part of the disc brake unit that clamps the rotor is formed. A drum-in disc, which is integrally formed by extension, and a hub unit with a rotor, a disc brake unit, and a drum brake are assembled to the back plate in advance to form a sub-assembly, and the sub-assembly is detachable from the knuckle. Brae Ki device. 3. The drum-in disc brake according to claim 1, wherein the back plate is provided with a bent portion serving as a tongue piece, and the bent portion serves as an anchor portion for receiving the braking force of the drum brake. apparatus. 4. The drum-in disc brake device according to claim 1, wherein the back plate is formed as a laminated body of a flat plate and a reinforcing plate. 5. An insertion hole for a bolt tightening tool, which faces a bolt tightening portion of the back plate to the knuckle, is formed through the hub surface of the hub unit so that the tightening operation can be performed from the outside of the vehicle. Item 3. The drum-in disc brake device according to Item 2.