JP3155917B2 - Caliper structure for disc brake - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a caliper for a disc brake.

[0002]

2. Description of the Related Art As a vehicle braking device, a disk brake device that brakes a vehicle by pressing a pad against a disk rotor is known. As an example of a disc brake device, Japanese Utility Model Laid-Open Publication No. 4-48437 discloses an opposed disc brake in which the disc rotor is sandwiched between pistons from both sides of the disc rotor. The opposed disk brake includes a disk rotor, inner and outer pads disposed on both sides of the disk rotor, and an inner caliper that slidably accommodates a piston that presses the inner and outer pads against the disk rotor, respectively. It is mainly composed of outer calipers. Further, while forming receiving surfaces of the outer pad on both ends in the circumferential direction on the inner surface of the outer caliper, a pair of projecting portions projecting outward in the axial direction are formed on both ends in the circumferential direction on the inner surface of the inner caliper. Since the receiving surface of the inner pad is formed on the side surface of the projection, the force acting on both pads during braking is divided and received by both calipers. As a result, there is no shortage of strength of both calipers and strength of a bolt connecting both calipers.

[0003]

SUMMARY OF THE INVENTION In a large vehicle such as a truck driving all wheels, when the above-mentioned opposed disc brake is used as a braking device for a front wheel, the space between the hub flange, the wheel and the knuckle flange of the front wheel is increased. Because it is very narrow, the space for placing the inner caliper and the outer caliper is limited. Therefore, it is difficult to dispose the large calipers and to strengthen the mounting portion for attaching the calipers to the vehicle body, and the calipers are reduced in size. When both calipers are small, heat generated by friction between the disc rotor and pad accumulates on the disc rotor, pad and caliper, and the friction coefficient decreases, such as fade phenomenon, brake fluid vapor lock phenomenon, or uneven wear of friction material. Problem may occur. Also,
There is also a problem that a sufficient braking force cannot be obtained, and a problem that the strength of both calipers is reduced.

Accordingly, an object of the present invention is to solve the above-mentioned problems, to transmit heat generated during braking to the vehicle body, and
An object of the present invention is to provide a small and strong disc brake caliper structure.

[0005]

According to the first aspect of the present invention, there is provided a caliper for accommodating a piston for pressing a brake pad,
In the disc brake caliper structure, which is divided into an inner member located inside the disk rotor and an outer member located outside the disk rotor in the vehicle width direction, the wheel is rotatable by accommodating the constant velocity joint.
A knuckle that supports and changes the direction of the wheels
The above inner member is integrated with the knuckle flange that constitutes the part
Formed on the outer circumference of the knuckle flange
Boss portion is provided so as to protrude, and
The reinforcement lip that connects the inner member to each other is integrally formed.
Configuration .

According to a second aspect of the present invention, in the caliper structure for a disk brake according to the first aspect, the knuckle flange is located inside the disk rotor in the vehicle width direction and outside the knuckle inner. And a knuckle outer, wherein the inner member is integrally formed with the knuckle outer.

[0007]

[0008]

[0009]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a cross-sectional view of the front wheels of a truck that drives all wheels. In the figure, reference numeral 1 denotes a trunnion socket fixed to an end of an axle case (not shown);
Denotes constant velocity joints housed inside the trunnion socket 1 and connected to an end of an axle shaft (not shown). The constant velocity joint 8 transmits the driving force from the axle shaft to the front wheels. A knuckle 2 as a support member for accommodating the constant velocity joint 8 is arranged around the constant velocity joint 8. Boss portions 2a for accommodating a king pin 1a as a steering shaft provided on the trunnion socket 1 are provided protruding from an upper portion and a lower portion of the knuckle 2 in the vehicle vertical direction (perpendicular to the paper surface). A cap 9 mounted on the boss 2a is interposed between the boss 1a and the boss 2a. The knuckle 2 is supported on the axle case so as to be rotatable in the steering direction with the kingpin 1a as a central axis.
On the vehicle rear side of the knuckle 2, a tie rod arm mounting surface 2b to which a tie rod arm (not shown) is fixed is formed. A tie rod is connected to the tie rod arm, and the left and right knuckles are integrally connected by the tie rod. A knuckle arm (not shown) is fixed to the knuckle 2 on the right side of the vehicle. By turning the knuckle 2 about the kingpin 1a as a center axis by the steering input from the knuckle arm, the direction of the front wheel can be changed.

The knuckle 2 is a knuckle flange inner 2
1, a knuckle flange outer 22 and a knuckle spindle 23. Each member is arranged from the inside of the vehicle body in the order of a knuckle flange inner 21, a knuckle flange outer 22, and a knuckle spindle 23. The knuckle flange inner 21 and the knuckle flange outer 22 are formed by a bolt 24a and a nut 24b.
Knuckle flange outer 2
The knuckle spindle 23 and the knuckle spindle 23 are integrally connected by a bolt 25.

The wheel hub 3 is rotatably supported on the knuckle spindle 23 via a roller bearing (not shown). The wheel hub 3 has a hub cap 4
And is directly connected to the end of the constant velocity joint 8 via a shaft, and is rotationally driven by a driving force transmitted from the axle shaft via the constant velocity joint 8. In wheel hub 3,
The wheel 5 and the disk-shaped disk rotor 6 are both fixed by bolts 7a and nuts 7b, respectively.

A friction surface 6a is formed on both surfaces of the outer peripheral portion of the disk rotor 6, respectively. Disk rotor 6
Opposite disk brakes 10 that sandwich the disk rotor 6 from both sides to perform braking are arranged on both sides of the disk rotor 6. The opposed disc brake 10 includes a pair of pads 11 and 12 facing each other, pistons 13 and 14 for pressing the pads 11 and 12 against the friction surfaces 6a, respectively, and the pistons 13 and 14 serving as rotation axes of the disc rotor 6. The caliper 15 mainly accommodates each of them so as to be slidable in a direction parallel to the main body.

The pad 11 is arranged inside the disk rotor 6, and has a friction member 11a which comes into contact with the friction surface 6a.
And a back metal 11b for holding the friction member 11a. The pad 12 is arranged outside the disk rotor 6, and like the pad 11, the friction member 12a
And the back metal 12b.

The caliper 15 is, as shown in FIGS.
An inner member 16 for accommodating the piston 13;
The outer member 17 accommodating 4 is integrally connected with a bolt 18. Inside the inner member 16 and the outer member 17, hydraulic paths for sliding the pistons 13, 14 are provided, respectively. Inner member 1
Numeral 6 is formed integrally with the knuckle flange outer 22 and is connected to the boss 2a by a reinforcing rib 19. The reinforcing ribs 19 are integrally formed on the outer periphery of the knuckle flange outer 22 over substantially a half circumference. By providing the reinforcing ribs 19, the mounting strength of the inner member 16 to the knuckle flange outer 22 is improved, and the disc rotor 6 is braked during braking.
The inner member 16 is not deformed even if it receives a braking reaction force from, and a sufficient braking force can be obtained.

An opening 15a for exchanging the pair of pads 11 and 12 is provided on the outer peripheral surface of the caliper 15. On the upper surface of the caliper 15, a holding member 15b for preventing the pads 11 and 12 from dropping from the opening 15a is provided with the opening 1a.
It is detachably attached so as to cover a substantially central portion of 5a. Since the pads 11 and 12 can be exchanged from the opening 15a simply by removing the holding member 15b from the caliper 15, it is not necessary to remove the outer member 17 in which the hydraulic path is incorporated when exchanging the pads 11 and 12. Workability is improved.

Next, transmission of heat generated during braking will be described. When a brake pedal (not shown) is depressed, the pistons 13 and 14 are moved to the pad 1 via a hydraulic path.
1 and 12 are pressed toward the disk rotor 6, respectively.
The friction members 11a and 12a are pressed against the friction surface 6a, and a braking action is performed on the disk rotor 6. The friction members 11a, 12a generate heat by being pressed against the friction surface 6a, and this heat is transmitted to the caliper 15 via the pads 11, 12 on the one hand and to the wheel hub 3 via the disk rotor 6 on the other hand. . The heat transmitted to the caliper 15 is transmitted to the knuckle flange outer 22 having a larger capacity than the caliper 15 via the inner member 16. Therefore, heat generated by friction between the friction members 11a and 12a and the friction surface 6a is transmitted to the knuckle flange outer 22, so that heat is prevented from being accumulated in the disk rotor 6, the pads 11, 12 and the caliper 15. You.

In the above-described embodiment, a case has been described in which the structure of the caliper integrally formed with the knuckle is used for steering and the front wheel which is a driving wheel is employed. However, the structure of the caliper described above is used for steering. It may be used for only the front wheels. Also, the case has been described where the inner member of the caliper is formed integrally with the knuckle flange outer, but the inner member may be formed integrally with the knuckle flange inner or the knuckle spindle.

[0018]

As explained above, according to the first aspect of the present invention, the inner member accommodates the constant velocity joint and
To rotate freely and change the direction of the wheels.
Power is transmitted to the knuckle flange that forms part of the vehicle. Therefore, since the heat capacity of the inner member is increased, heat is prevented from accumulating in the disk rotor, the pad and the inner member even when the heat load is increased, and the performance with respect to the heat load is improved. The phenomenon or uneven wear of the friction material is prevented. Further, since the strength of the inner member is improved, the performance with respect to the braking reaction force is also improved, and a sufficient braking force can be obtained. In addition, Knucklef
The steering shaft mounting boss and the inner member are
Reinforcement ribs that connect to each other are integrally formed,
Rigidity against dynamic reaction force can be further improved.

According to the invention of claim 2, the inner member is
Since it is a knuckle outer having a knuckle flange composed of a knuckle inner and a knuckle outer, integration can be easily realized and the number of parts can be reduced.

[0020]

[0021]

[Brief description of the drawings]

FIG. 1 is a partially cutaway cross-sectional view of a front wheel using a caliper of the present invention.

FIG. 2 is a side view of the knuckle of FIG. 1;

FIG. 3 is a front view of the knuckle of FIG. 1;

FIG. 4 is a plan view of the knuckle of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Trunnion socket 1a King pin 2 Knuckle 2a Boss part 3 Wheel hub 6 Disc rotor 6a Friction surface 8 Constant velocity joint 10 Opposite type disc brake 11,12 Pad 13,14 Piston 15 Caliper 15a Opening 15b Holding member 16 Inner member 17 Outer member 19 Reinforcing rib 21 Knuckle flange inner 22 Knuckle flange outer 23 Knuckle spindle

Continued on the front page (56) References JP-A-61-31733 (JP, A) JP-A-56-116538 (JP, A) JP-A-6-35080 (JP, U) (58) Fields investigated (Int) .Cl. ⁷ , DB name) F16D 49/00-71/04 B62D 7/18

Claims (2)

(57) [Claims] A caliper accommodating a piston for pressing a brake pad is divided into an inner member located inside a disk rotor and an outer member located outside the disk rotor in a vehicle width direction. In the brake caliper structure, the inner member is integrally formed with a knuckle flange that accommodates a constant velocity joint and rotatably supports the wheel and forms a part of a knuckle that changes the direction of the wheel, and an outer periphery of the knuckle flange A boss for attaching a steering shaft, and a reinforcing rib for connecting the boss and the inner member to each other are integrally formed. 2. A knuckle inner, wherein the knuckle flange is located inside a disk rotor in a vehicle width direction.
The caliper structure for a disc brake according to claim 1, wherein the caliper structure is divided into a knuckle outer positioned outside the knuckle inner and the inner member is formed integrally with the knuckle outer.