JPH0650663Y2 - Caliper floating 2-piston disc brake - Google Patents

Description

TECHNICAL FIELD The present invention relates to a caliper floating two-piston disc brake, and in particular, miniaturization of a torque receiving member,
The present invention relates to a technique for preventing uneven wear of the outer pad while reducing the weight.

Conventional technology As a caliper floating 2-piston disc brake,
For example, there is one described in Japanese Utility Model Publication No. 62-162426.
In this disc brake, the central claw provided on the reaction part is made sufficiently long, so that when braking, the entire outer pad is pressed with a substantially uniform force in cooperation with a pair of side claws provided on both sides thereof. However, there is an advantage that uneven wear of the outer pad can be reduced. However, on the other hand, the torque receiving member is
Since the bridge portion for connecting the pair of outer pad supporting portions to each other as described in No. 24269 is not provided, there is a problem that the torque receiving member cannot be increased in size and weight. If the pair of outer pad support portions are connected to each other by the bridge portion, the rotational torque of the disk rotor transmitted to one outer pad support portion via the outer pad during braking is also transmitted to the other outer pad support portion by the bridge portion. Both outer pad support parts jointly receive the rotation torque, and the torque receiving member can be made smaller and lighter. However, if the bridge part is not provided, only one outer pad support part receives the rotation torque. Therefore, it is necessary to increase the rigidity of the outer pad supporting portion, and the torque receiving member becomes large and heavy.

Therefore, the applicant has produced a caliper floating two-piston disc brake as shown in FIGS. 4 to 6. The disc brake includes a disc rotor 100, an inner pad 102, an outer pad 104, a torque receiving member 106, and a caliper 108, and the outer pad of the torque receiving member 106.
A pair of support portions 110 that support 104 are connected by a bridge portion 112 so that a small and lightweight torque receiving member 106 can sufficiently receive the rotational torque of the rotor 100.
The caliper 108 is provided with a pair of cylinder parts 116 (only one of which is shown in the drawing) having a fix 114,
At the time of braking, each piston 114 presses the inner pad 102, and the reaction force thereof causes the caliper 108 to move in a direction parallel to the axial center of the disc rotor 100, so that the reaction portion 118 of the reaction portion 118 provided opposite to the two cylinder portions 116 is provided. The pair of side claws 120 and the center claw 122 press the outer pad 104.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above disc brake, since the length l of the central pawl portion 122 is shorter than that of the side pawl portion 120,
There is a problem that the outer pad 104 may be unevenly worn due to unavoidable lack of pressing force at the center of the outer pad 104 during braking.

The bridge portion 112 has a curved shape along an arc centered on the axis of the disc rotor 100, and its cross section is
As is apparent from FIGS. 5 and 6, the cross-sectional shape of the central portion (V-V cross-section) and the cross-sectional shape of both ends (VI-VI cross-section)
And are the same. Both ends of the bridge portion 112 are attached to the support portion 110 of the torque receiving member 106 and the ear portion 1 of the outer pad 104.
Cutting tool 12 (4th
(Indicated by the chain double-dashed line in the figure)
It is curved in a direction away from the engagement notch 126, and therefore the side claw portion 120 can have a sufficient length, but the central portion of the bridge portion 112 is
As shown by the chain double-dashed line in FIG. 5, in order to avoid interference with the disc wheel 130 located in the vicinity thereof, the central claw portion 1
Since it is curved toward the 22 side, the central claw portion 122
If is extended to a length substantially equal to that of the side claw portion 120, it will interfere with the central portion of the bridge portion 112. Therefore, the center claw portion 122 had to be shorter than the side claw portion 120.

In view of this problem, the present invention provides a caliper floating two-piston disc brake in which the torque receiving member has a bridge portion, but the central pawl portion of the reaction portion is sufficiently long to press the outer pad satisfactorily. This was done as an issue.

Means for Solving the Problems And, the gist of the present invention is: (a) a disk rotor that rotates together with a wheel; (b) an inner pad and an outer pad that are arranged so as to face the plate surface of the disk rotor;
(C) A torque receiving member that is non-rotatably disposed near the disc rotor to support the inner pad and the outer pad, and that includes a bridge portion that connects a pair of support portions that support the outer pad to each other; Two cylinder parts each having a piston that presses the pad against the disk rotor, and a reaction part that is provided with a pair of side claw parts and a central claw part facing the cylinder parts and presses the outer pad against the disk rotor , A caliper floating two-piston disc brake including a caliper provided so as to be movable in a direction parallel to the axis of the disc rotor, the gaps Z ₁ and Z ₂ between the center pad of the bridge portion and the outer pads of both ends. the relationship with the Z _1> Z _2, the cross-sectional shape disc rotor radius direction of their central portion and both end portions Dimensions X _1, X ₂ and axial dimensions Y ₁ of
The relationship with Y ₂ is X ₁ > X ₂ and Y ₁ <Y _2, and the center claw part is inserted between the outer pad and the center part of the bridge part until the tip projects from the inner peripheral edge of the bridge part. There is something to do.

Action In the disc brake configured as described above,
The cross-sectional shapes of both ends of the bridge part and the center part are different, and at the center part, the dimension Y _{1 in the} axial direction of the rotor is made smaller than that at both ends, and instead, the dimension X ₁ in the rotor radial direction is set. Has been increased. Therefore, the gap between the central portion and the outer pad can be made wider than the gap between both end portions and the outer pad without reducing the cross-sectional area of the central portion of the bridge portion, and the central claw portion can be inserted with sufficient thickness. The central pawl can be approximately the same length as the side pawl or longer. On the other hand, at both ends of the bridge portion, the dimension X _{2 in the} radial direction of the rotor is reduced, and the dimension Y _{2 in the} axial direction of the rotor is increased instead. Therefore, it is possible to avoid the interference between the both ends and the engaging notch cutting tool without reducing the cross-sectional area.

As described above, according to the present invention, by providing the bridge portion having sufficient rigidity to reduce the size and weight of the torque receiving member, the cross-sectional shape is changed between the central portion and both end portions. The length of the central claw portion can be set to the same suitable dimension as the side claw portion, and can be made sufficiently thick. Therefore, it is possible to press the outer pad with a substantially uniform pressing force, and it is possible to favorably reduce the uneven wear of the outer pad and the accompanying dragging.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

In FIGS. 1 to 3, reference numeral 10 denotes a disk rotor (hereinafter, simply referred to as a rotor) that rotates together with wheels. At a position facing the plate surface of the rotor 10, an inner pad 20 and an outer pad 22 composed of friction materials 12 and 14 and steel back plates 16 and 18 fixed to the back surfaces thereof are provided. Rotor
A mounting bracket 24 serving as a torque receiving member is non-rotatably arranged near 10. The mounting bracket 24 has a shape in which a pair of pad support portions 26, 28 located on both sides of the rotor 10 are connected to a main body portion 32 by a connecting portion 30 extending beyond the outer periphery of the rotor 10, and the outer periphery of the rotor 10 is It is provided in a straddle state. Pad support
Engagement notches 34, 36 are formed in 26, 28, and the ear pads 38, 40 formed on the back plate 18 of the outer pad 22 are engaged with the engagement notches 34, 36, respectively, so that the outer pad 2
2 is supported by the pad supporting portions 26 and 28 so as to be slidable in a direction parallel to the axis of the rotor 10. On the other hand, although not shown,
Similar ears are formed on the inner pad 22 and are engaged with the engagement notches formed on the main body 32.

The pad support portions 26 and 28 are connected by the bridge portion 42. The bridge portion 42 is provided with the pad support portions 26, 28 during braking.
Together to receive the rotational torque of the rotor 10, and form an arc shape curved along an arc centered on the axial center of the rotor 10.

A caliper 50 is arranged on the outer peripheral side of the rotor with respect to the mounting bracket 24 so as to sandwich the pair of pads 20 and 22. The caliper 50 is provided so as to face the back surface of the inner pad 20, and the piston 54 is provided in each cylinder bore.
Two cylinder portions (only one of which is shown in FIG. 2 and FIG. 3) 56 provided with a pair of side claw portions 58, 6 facing the rear surface of the outer pad 22 and facing the cylinder portion 56.
0 and a reaction portion 64 having a central claw portion 62, and a connecting portion 66 for connecting these over the outer circumference of the disc rotor 10.
And two slide pins (not shown) provided upright on the mounting bracket 24 so as to be movable in a direction parallel to the axis of the disc rotor 10. Therefore, when the brake fluid pressure is supplied to the cylinder bore of each cylinder portion 56, each piston 54 presses the inner pad 20 against the friction surface of the rotor 10, and the reaction force thereof causes each claw portion 58, 60 of the reaction portion 64. 62 presses the outer pad 22 against the other friction surface.

As shown in FIG. 2, the cross-sectional shape of the central portion of the bridge portion 42 is such that the dimension X _{1 in the} radial direction is larger than the dimension Y _{1 in} the axial direction of the rotor 10. Also, as shown in FIG.
The cross-sectional shape of both ends of the bridge 42 is the radial dimension X ₂
On the other hand, the dimension Y _{2 in the} axial direction is increased, and comparing the central portion and both end portions, the relation between the dimensions is X ₁ > X ₂ and Y ₁ <Y ₂ . As a result, although the center portion of the bridge portion 42 has a sufficient cross-sectional area, the gap Z ₁ between the outer pad 22 and the back plate 18 becomes wider than the gap Z ₂ between the both ends and the back plate 18, and the reaction The central pawl portion 62 of the portion 64 can be inserted into the gap Z ₁ , and the tip thereof protrudes from the inner peripheral edge of the bridge portion 42 and, like the both side pawl portions 58 and 60, the rotor pad side end portion of the outer pad 22. It has reached the vicinity. Moreover, as is clear from FIGS. 2 and 3, the central claw portion is
The thickness of 62 in the axial direction of the rotor is made sufficiently thick. A disk wheel 66 is provided near the bridge portion 42 as shown by a chain double-dashed line in FIG. 2, but there is no risk of interference with the central pawl portion 62 and the bridge portion 42. The shapes of the central claw portion 62 and the bridge portion 42 are set as such.

Therefore, the length l of the central claw portion 62 can be made longer than in the conventional case, and the three claw portions 58, 60 and 62 of the reaction portion 64 can evenly press the back plate 18 of the outer pad 22 during braking. It can be pressed with. Thereby, the curvature of the back plate 18 at the time of braking can be smaller than the conventional one,
The uneven surface pressure of the friction material 14 due to the curvature of the back plate 18 is reduced, and the uneven wear of the friction material 14 and the drag of the brake caused thereby are favorably prevented.

Further, at both ends of the bridge portion 42, the radial width X ₂
So that if smaller than the width Y ₂ of the axial direction, the engaging notch
Interference between the cutting tool for cutting 34, 36 and the bridge portion 42 is avoided, and the cross-sectional area is sufficient, and the rigidity of the bridge portion 42 is not insufficient.

Although one embodiment of the present invention has been described above, the present invention is implemented in various modified and improved modes based on the knowledge of those skilled in the art, such as appropriately changing the sectional shape and size of the central claw portion. be able to.

[Brief description of drawings]

FIG. 1 is a front view showing a caliper floating two-piston disc brake according to an embodiment of the present invention. 2 is a sectional view taken along the line II-II of FIG. 1, and FIG. 3 is the same as III-III.
FIG. FIG. 4 is a front sectional view showing a conventional caliper floating two-piston disc brake, FIG. 5 is a VV sectional view thereof, and FIG. 6 is a VI-VI sectional view thereof. 10: Disc rotor, 20: Inner pad 22: Outer pad 24: Mounting bracket 42: Bridge part, 50: Caliper 54: Piston, 56: Cylinder part 58, 60: Side claw part, 62: Central claw part 64: Reaction part

Claims (1)

[Scope of utility model registration request] 1. A disk rotor that rotates together with a wheel, an inner pad and an outer pad that are arranged so as to face a plate surface of the disk rotor, and a non-rotatably arranged inner pad and an inner pad near the disk rotor. A torque receiving member having a bridge portion that supports the outer pad and connects a pair of support portions that support the outer pad to each other, and two cylinder portions that respectively have pistons that press the inner pad against the disc rotor, A pair of side claws and a central claw that face the cylinders, and a reaction part that presses the outer pad against the disc rotor, and is movably provided in a direction parallel to the axis of the disc rotor. Caliper floating type 2 piston type disc brake including The relationship of the clearances Z ₁ and Z ₂ between the center portion and both end portions of the bridge portion and the outer pad is Z ₁ > Z ₂ , and the cross-sectional shape between the center portion and both end portions is the disk rotor radial direction. The relationship between the dimensions X ₁ and X ₂ and the axial center dimensions Y ₁ and Y ₂ is X ₁ > X ₂
And a shape in which Y ₁ <Y _2, and the central claw portion is inserted between the outer pad and the central portion of the bridge portion until the tip projects from the inner peripheral edge of the bridge portion. brake.