JPH0534346Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a disc brake.

Prior Art A disc rotor, a cylinder part and a claw part facing each other across the outer periphery of the disc rotor, and a cylinder part and a claw part that are connected on the outer periphery side of the disc rotor and parallel to the axis of the disc rotor. The connecting portion has a guide having a substantially constant wall thickness in a direction parallel to the axis of the disk rotor and a predetermined length in the direction parallel to the axis of the disk rotor, integrally protruding from both sides. death,
The caliper is disposed astride the disc rotor, and a back plate is disposed between the cylinder part and the claw part with the disc rotor in between, and the back plate is located at the outer peripheral side end of the disc rotor. and a pair of recesses formed on both sides in the circumferential direction of the disc rotor, respectively protruding toward the outer circumferential direction of the disc rotor and having a shape substantially corresponding to a cross section of the guide cut in a direction perpendicular to the disc rotor axis on opposing surfaces. A disc brake of the type is known, which has a protruding part and a pair of pads supported by the caliper so as to be movable in a direction parallel to the axis of the disc rotor by fitting a guide into the recess. It is being

Problems to be Solved by the Invention However, in such a disc brake, if the guide is formed with a substantially constant wall thickness so as to be spaced apart from the outer periphery of the disc rotor from the base to the tip, for example, If the disc rotor is formed in a direction parallel to the tangent to the outer periphery of the disc rotor at the center in the circumferential direction, the recess is formed from the tip of the protrusion in order to provide strength to the tip of the protrusion of the back plate. If the necessary and sufficient dimensions are to be ensured, it is difficult to avoid that the tip of the protruding portion protrudes toward the inner circumferential surface of the wheel from the surface of the caliper connection portion located on the outer circumferential side of the disk rotor. In disc brakes, it is generally desirable to arrange the caliper and pads on the outer circumferential side of the disc rotor to increase the braking radius in order to secure even greater braking force. Since the tip of this protrusion interferes with the inner peripheral surface of the wheel, there has been a problem in that the pad and caliper cannot be disposed on the outer peripheral side of the disc rotor.

In addition, in such disc brakes, it is always required to reduce the weight of parts, but in order to obtain the strength of the base of the protrusion, a sufficient width dimension from the recess to the side edge in the circumferential direction of the disc rotor must be ensured. If the recess of the back plate is parallel to the tip surface and the side end is parallel to the recess, that is, the side end is parallel to the radial direction of the disc rotor at the center of the disc rotor of the caliper in the circumferential direction. This made it difficult to reduce the weight.

The present invention was developed against the background of the above-mentioned circumstances, and its purpose is to increase the braking radius by arranging the caliper and pad on the outer peripheral side of the disc rotor. To provide a disc brake that can secure a larger braking force and reduce weight by making the back plate smaller.

Means for Solving the Problems In order to achieve the above object, the gist of the present invention is to provide a disc brake of the type described above, in which the guide has a substantially constant wall thickness and extends around the disc rotor. The distal end surface of the guide is formed parallel to the radial direction of the disc rotor, and the angles formed by the guide with the outer circumferential side and inner circumferential side of the disk rotor are substantially right angles.

Function and Effects of the Invention With this structure, the guide is not formed so as to be separated from the outer periphery of the disk rotor from the base to the tip, so that the tip of the protrusion of the back plate is provided with a protrusion to provide strength. Even if the necessary and sufficient dimension from the tip of the part to the recess is ensured, the tip of the protruding part can be prevented from protruding toward the inner peripheral surface of the wheel from the surface of the caliper connection part located on the outer peripheral side of the disc rotor. By arranging the caliper and pad on the outer peripheral side of the disc rotor, the braking radius can be increased and a larger braking force can be secured.

In addition, with this configuration, the tip end surface of the guide is formed parallel to the radial direction of the disk rotor, and the angles formed by the guide with the outer and inner surfaces of the disk rotor are approximately right angles, so that the back Since the bottom of the recess in the plate can be formed parallel to the tip surface, and the side edges of the back plate in the circumferential direction of the disc rotor can be formed parallel to the bottom, the base of the protrusion can be formed to maintain the strength of the back plate. When the width dimension from the recess to the side edge is the same as in the conventional case, the weight of the back plate is further reduced compared to the conventional case.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail based on the drawings.

In FIGS. 2 and 3, 10 is a disk rotor, and 12 is a caliper. Calipa 12
The cylinder part 14 has a piston (not shown) fitted therein so as to be able to protrude toward the disc rotor 10, and bifurcated claw parts that face each other with the cylinder part 14 and the outer periphery of the disc rotor 10 sandwiched therebetween. 16, the cylinder portion 14 and the claw portion 1
6 on the outer peripheral side of the disc rotor 10. A pair of arm portions 20 are protruded from both sides of the cylinder portion 14 facing the circumferential direction of the disk rotor 10, while a pair of arm portions 20 are provided on non-rotating members (not shown) located parallel to the braking surface of the disk rotor 10. The fixing portion 22 and the fixing portion 22 are located at the outer circumferential side of the disk rotor 10 and extend from both sides in the circumferential direction of the disk rotor 10 in a direction parallel to the axis of the disk rotor 10 and are located on the outer circumferential side of the disk rotor 10. A torque receiving member 26 consisting of a pair of torque receiving parts 24 is integrally fixed in a mounting hole 28 provided in the fixing part 22. Slide pins 30 are respectively provided on the arm portion 20 to protrude in a direction parallel to the axis of the disk rotor 10, and the protruding sides of the slide pins 30 fit into fitting holes (not shown) provided in the torque receiving portion 24. By being slidably fitted, the caliper 12 is supported by the torque receiving member 26 so as to be movable in a direction parallel to the axis of the disc rotor 10, and is provided astride the outer circumference of the disc rotor 10.

On both sides of the connecting portion 18 parallel to the axis of the disk rotor 10, there are guides 32 whose cross section cut perpendicular to the axis of the disk rotor 10 is approximately rectangular. They are each integrally protruded over a predetermined length in the same direction. As shown in FIG. 1, each guide 32 has a distal end surface 34 formed along the radial direction (normal line a direction) of the disk rotor 10, and a surface located on the outer peripheral side of the disk rotor 10. 36 and a surface 38 located on the inner circumference side of the disk rotor are formed along the circumferential direction of the disk rotor 10, so that the distal end surface 34 and the surface 36 on the outer circumference side and the surface 38 on the inner circumference side The angles formed are approximately right angles. In addition, in Figure 1,
39 is the inner peripheral surface of the wheel, and in Fig. 3,
Reference numeral 40 indicates a notch for allowing pads 42 and 44, which will be described later, to be attached to the guide 32.

As shown in FIGS. 1 to 3, a pair of pads 4 are provided between the cylinder portion 14 and the claw portion 16.
2 and 44 are arranged with the disk rotor 10 sandwiched therebetween. These pads 42 and 44 each include a back plate 46 and a friction material 48 fixed thereto. A pair of protrusions 50 protrude toward the outer circumferential direction of the disc rotor 10, respectively. As shown in FIGS. 1 and 2, recesses 52 each having a shape substantially corresponding to the cross section of the guide 32 are formed in opposing surfaces of the pair of protrusions 50 of each back plate 46. By fitting the guide 32 into these recesses 52, both pads 4
2 and 44 are supported by the caliper 12 so as to be movable in a direction parallel to the axis of the disc rotor 10. The protruding parts 50 of the back plate 46 are brought into contact with the opposing inner surfaces of the torque receiving part 24, and the braking torque generated on the pads 42, 44 based on this contact is transmitted to the torque receiving part 24. It will be received by the member 26. Incidentally, since the operation of the disc brake configured as described above is not necessarily necessary for understanding the present invention, a detailed explanation thereof will be omitted.

Here, FIG. 4 is a diagram showing the main parts of a conventional disc brake. In FIG. 4, an inner surface 64 and an outer surface 66 of the guide 60 are shown.
are formed in a direction parallel to the tangent to the outer periphery of the disc rotor 10 at the central part of the caliper 12 in the circumferential direction of the disc rotor 10, and are parallel to each other so as to become further apart from the outer periphery of the disc rotor 10 from the base to the tip. Along with being formed,
The tip surface 62 of the guide 60 is formed parallel to the radial direction of the disc rotor 10 at the center of the caliper 12 in the circumferential direction of the disc rotor 10 . Furthermore, the recess 70 and side edges 72 of the back plate 68 are formed parallel to the tip surface 62. Thereby, in order to maintain the strength of the tip of the protrusion of the back plate 68, the fourth
In order to ensure the necessary and sufficient dimensions indicated by b in the figure, the tip of the protruding portion should protrude from the surface of the connecting portion 18 of the caliper 12 located on the outer circumferential side of the disc rotor 10 toward the inner circumferential surface 39 of the wheel. is difficult to avoid. As a result, the tip of the protruding portion interferes with the inner circumferential surface 39 of the wheel, resulting in a problem that the pads 42, 44 and the caliper 12 cannot be disposed on the outer circumferential side of the disc rotor 10.

On the other hand, according to the present embodiment, the outer peripheral side surface 36 of the guide 32 is formed along the circumferential direction of the disc rotor 10, thereby ensuring a dimension corresponding to b in the case of FIG. Even in this case, the tip of the protruding portion 50 can be prevented from protruding from the surface of the caliper 12 located on the outer peripheral side of the disc rotor 10, so that the pads 42, 44 and the caliper 12 can be moved closer to the disc than in the case of FIG. It becomes possible to arrange it on the outer peripheral side of the rotor 10.
As a result, a sufficient braking radius can be secured and a larger braking force can be obtained compared to the case shown in FIG. 4.

Further, according to this embodiment, the tip surface 34 of the protrusion 32 is formed along the normal line a, and the bottom of the recess 52 is formed parallel to the tip surface 34, so that the back plate 46 Even if the hatched portion in FIG. 1 is deleted and the side end 74 is made parallel to the bottom of the recess 52 as shown by the two-dot chain line, substantially the same strength as the back plate 68 shown in FIG. 4 can be obtained. As a result, when the hatched portion is removed, the weight of the back plate 46 is further reduced compared to the case shown in FIG. 4.

Further, in the above embodiment, the pad 42,
The braking torque generated at 44 is directly transferred to the torque receiving part 2.
4, the braking torque generated in the pads is transmitted to the caliper and indirectly received by the torque receiving part based on the contact between the side part of the caliper connecting part and a predetermined torque receiving part. It may also be a disc brake configured to receive braking torque at. In this case, a large force corresponding to the braking torque will be applied to the protrusion of the pad and the guide of the caliper, but if the guide and the recess of the protrusion are shaped as shown in Figure 1, This has the advantage that the strength of the guide and the protrusion can be suitably obtained.

Further, in the above embodiment, the caliper 12
Although the caliper is supported by a pair of slide pins 30, it may be a disc brake in which the caliper is supported by a single slide pin.

In addition, various changes may be made to the present invention without departing from the spirit thereof.

[Brief explanation of the drawing]

FIG. 1 is an enlarged view of the main part of FIG. 2. FIG. 2 is a front view showing the main parts of a disc brake to which the present invention is applied. FIG. 3 is a plan view of FIG. 2. FIG. 4 is a diagram showing the main parts of a conventional disc brake, and corresponds to FIG. 1. 10... Disc rotor, 12... Caliper,
14... Cylinder part, 16... Claw part, 18... Connection part, 32... Guide, 34... Tip surface, 36...
...Outer circumferential surface, 38... Inner circumferential surface, 39... Wheel inner circumferential surface, 42, 44... Pad, 46...
Back plate, 50...protrusion, 52...recess.

Claims (1)

[Claims for Utility Model Registration] A disk rotor, a cylinder portion and a pawl portion facing each other across the outer periphery of the disk rotor, the cylinder portion and the pawl portion being connected on the outer periphery side of the disk rotor, and the disk rotor. A guide having a substantially constant wall thickness in a direction parallel to the axis of the disk rotor from both sides parallel to the axis of the rotor and a predetermined length in the direction parallel to the axis of the disk rotor is integrated. a caliper extending over the disc rotor; and a back plate disposed between the cylinder part and the pawl part with the disc rotor in between; At the outer circumferential end of the disk rotor of the back plate and on both sides in the circumferential direction of the disk rotor, on surfaces that respectively protrude toward the outer circumferential direction of the disk rotor and face each other, the guide is provided in a direction perpendicular to the axis of the disk rotor. It has a pair of protrusions each having a recess formed in a shape that substantially corresponds to the cut cross section, and when the guide is fitted into the recess, the caliper is moved in a direction parallel to the axis of the disc rotor. A disc brake is provided with a pair of pads that are supported so that the guide has a substantially constant wall thickness and is protruded in the circumferential direction of the disc rotor, and the tip surface of the guide is arranged in a radius of the disc rotor. 1. A disc brake characterized in that the guide is formed parallel to the direction and the angles formed by the outer and inner surfaces of the disc rotor are substantially right angles.