JPH0539217Y2 - - Google Patents

Description

[Detailed Description of the Invention] A. Purpose of the Invention (Field of Industrial Application) The present invention relates to an opposed disc brake in which pistons are disposed in an inner caliper and an outer caliper, respectively.

(Conventional technology) Conventionally, as a type of disc brake,
A sliding type disc brake in which a caliper is slidably attached to an anchor plate, and an opposed type disc brake in which a caliper is fixedly attached to an anchor plate are well known. In addition, as opposed type disc brakes, for example,
Some of these are disclosed in Japanese Patent Publication No. 57-55550 and Japanese Patent Publication No. 62-6998.

An example of such a conventional opposed type disc brake is shown in FIG. The opposed disc brake 50 is disposed on the axially inner side of the wheel rim 3 and on the inner diameter side. Note that in this figure, the left side is the inner side in the axial direction. This disc brake 50 has an inner caliper 51 and an outer caliper 53, and both of these calipers 51, 5
3 are connected together and an anchor plate (not shown) is also fixed thereto. Inner and outer calipers 5 integrally connected in this way
A pad insertion space 59 is formed inside the pads 1 and 53 and is open to the outer diameter side and the inner diameter side.

Further, both calipers 51 and 53 have cylinder holes 51a opening into the pad insertion space 59, respectively.
53a are formed to face each other, and pistons 52, 53a are formed in these cylinder holes 51a, 53a, respectively.
54 is slidably inserted. each piston 5
2 and 54 are opposed to an inner pad 55 and an outer pad 56, respectively, which are arranged to sandwich the rotor 6 therebetween. These inner pads 55 and outer pads 56 are
5a and 56a are suspended and held by hanger pins 57 attached across both calipers 51 and 53.

Therefore, when brake hydraulic pressure acts in the cylinder holes 51a, 53a, the pistons 52, 54 are pushed out, and the inner and outer pads 55, 5
6 to generate braking force by pressing against the inner surface 6a and outer surface 6b of the lining rotor 6.

Generally, the linings of the pads 55 and 56 wear out as the brakes are used, so it is necessary to replace the linings when they wear down to a certain limit. It is desirable to increase the lifespan as much as possible. In this case, rotor 6
The outer diameter of the rotor 6 is increased to improve heat dissipation of the rotor 6,
It is believed that by suppressing the temperature rise of the rotor 6 during brake operation, it is possible to suppress the wear of the pads 55 and 56 and extend their lifespan.

(Problem to be Solved by the Invention) However, as shown in FIG.
It is difficult to increase this outer diameter, and the inner and outer pads 55,
A space for arranging the hanger pin 57 for suspending and holding the rotor 6 is required on the outer diameter side of the rotor 6, and there is a problem that the outer diameter of the rotor 6 cannot be made very large.

In particular, since forces from both pads 55 and 56 act on the hanger pin 57 during braking, it is necessary to ensure sufficient strength. For this reason, the diameter of the hanger pin 57 is often increased, and the space occupied by the hanger pin 57 becomes large, making it difficult to increase the outer diameter of the rotor 6.

In view of these problems, the present invention can hold pads without using hanger pins.
An object of the present invention is to provide an opposed disc brake having a structure that allows the outer diameter of the rotor to be increased.

B. Structure of the invention (means for solving the problem) In order to achieve the above object, in the opposed disc brake of the invention, openings are provided on the outer diameter side and the inner diameter side in the inner and outer calipers that are integrally connected. In addition to forming a pad insertion space, the inner and outer calipers each have protrusions that project into the pad insertion space at their inner ends, so that the inner and outer pads can be inserted into the pad insertion space from the outer diameter openings. The inner and outer pads are inserted until their inner ends abut against each other, and then a retainer member is attached to cover the pad insertion space from the outer diameter side to hold the inner and outer pads in a state inserted into the pad insertion space. .

Note that the protrusion may be made from a pin member that is attached to the inner or outer caliper and projects into the pad insertion space.

Furthermore, this protrusion is made to come into contact with a part of the inner end of the inner or outer pad, and the protrusion is made to protrude inward at the inner end of the inner or outer pad, avoiding the contact part with the protrusion. It is preferable to attach a pad wear detector.

(Function) When using the opposed disc brake with the above configuration, the inner and outer pads are held in the pad insertion space with the inner diameter side abutting the protrusion and the outer diameter side covered with the retainer member, and using the hanger pin. Both pads are held within the caliper without any problems.

(Embodiments) Hereinafter, preferred embodiments of the present invention will be described based on the drawings.

Opposed disc brake BR applying this invention
are shown in FIGS. 1 and 2. This disc brake BR has an inner caliper 10 and an outer caliper 20, and both calipers 10, 2
0 is integrally connected by a total of six connecting bolts 18, three on the left and right, and furthermore, in this integrally connected state, it is attached to the anchor plate 1 at the leg portion 10a of the inner caliper 10 by four mounting bolts 9. Fixed.

As shown in FIG. 3, which is a sectional view taken along the arrow -, this opposed disc brake BR is disposed inside the wheel rim 3. A pair of cylinder holes 11 and 21 are formed inside the inner caliper 10 and the outer caliper 20 so as to face each other, and pistons 12 and 2 are slidably provided in each of the cylinder holes 11 and 21.
2 is inserted.

An inner pad 15 and an outer pad 2 are located opposite the open end portions of these pistons 12 and 22.
5 is disposed, and a rotor 6 is disposed at a position sandwiched between these pads 15 and 25. This rotor 6 is connected to the wheel hub 2 and rotates together with the wheel. In addition, inner pad 15
and outer pad 25 are respectively
7, 27 and linings 16, 26 joined to the back plates 17, 27, the back plates 17, 27 face the open ends of the pistons 12, 22, and the linings 16, 26 face the inner surface 6a of the rotor 6. and facing the outer surface 6b.

On the other hand, as can be clearly seen from FIGS. 2 and 4 (cross-sectional view taken along the arrow -), the outer caliper 20 has a pair of left and right arm portions 20a extending toward the inner caliper 10 (inwardly in the axial direction). 20
a, and the distal end surfaces B of these arm portions 20a abut against the side surface of the inner caliper 10, and connection by the connecting bolt 18 is made at this portion.

Left and right arm portions 2 in the outer caliper 20
Between 0a and 20a is a pad insertion space 19 (third
) is formed, and the inner caliper 1
0, this pad insertion space 19
Inner and outer pads 1 from the outer diameter side
5,25 are inserted.

As shown in FIGS. 5 and 6, a protrusion 10e that protrudes outward in the axial direction is formed at the circumferential center on the inner diameter side of the inner caliper 10,
As described above, the inner end of the back plate 17 of the inner pad 15 inserted into the pad insertion space 19 from the outer diameter comes into contact with this protrusion 10e, and the inner pad 15 is held in the position shown in FIG. Further, a pair of protrusions 10b, 10b protruding outward in the axial direction are formed at both ends in the circumferential direction of the inner caliper 10, and an inner pad receiver is formed of surfaces 10c, 10c of these protrusions 10b, 10b, which face each other. Surfaces 10c, 10c are both circumferential end surfaces 17a, 17 of back plate 17 of inner pad 15.
Closely facing a.

Similarly, as shown in FIGS. 3 and 7, protrusions 20e that protrude axially outward are formed at two locations on the inner diameter side of the outer pad 20, and the pad insertion space is inserted from the outer diameter side as described above. The inner end of the back plate 27 of the outer pad 25 inserted into the outer pad 19 comes into contact with these protrusions 20e, and the outer pad 25 is held in the position shown in FIG. Furthermore, outer pad receiving surfaces 20c, 20c are formed at both ends in the circumferential direction on the inner surface of the outer caliper 20, and these receiving surfaces 20c, 20c are formed at both ends in the circumferential direction of the back plate 27 of the outer pad 25. Surface 27a, 2
Closely facing 7a.

In this way, with the inner pad 15 and the outer pad 25 inserted into the pad insertion space 19, the two plates 31 and 3 are placed on top of the inner pad 15 and the outer pad 25.
A retainer member 30 consisting of 3 is inserted into the pad insertion space 1.
cover the calipers 10 and 2 with bolts 39.
Fixed to 0. As a result, both pads 15, 2
5, both calipers 10,
20.

In such a configuration, the retainer member 30
By removing the pads 15 and 25, the pads 15 and 25 can be inserted into the pad insertion space 19 through the opening on the outer diameter side, and taken out from the pad insertion space 19. It can be done easily.

The retainer member 30 includes a spring plate 33 and a retainer plate 31 attached to overlap the spring plate 33.

As shown in FIG.
has a pair of mounting arms 33a extending in the axial direction and a pressing arm 33b extending in the circumferential direction, and the mounting arms 33a are attached to the caliper 10 by bolts 39.
20, and in this state the pressing arm 33
b contacts the upper ends 17b, 27b of the back plates 17, 27 of both pads 15, 25 and presses them (see FIGS. 5 and 7). This spring plate 33 is made of an elastic material and presses both pads 15, 25 in the inner radial direction with a predetermined pressing force F1. This pressing force F1 suppresses the vibration of the pads 15, 25, but in order to reduce the resistance to the movement of the pads 15, 25 in the axial direction, this pressing force F1 is set to the minimum value within the range in which vibration suppression can be achieved. It is set so that

On the other hand, the retainer plate 31 has a pair of mounting arms 31a extending in the axial direction and a stop arm 31b extending in the circumferential direction.
a is fixed to the calipers 10 and 20 with bolts 39. In this state, the stop arm 31b faces the upper ends 17c, 27c of the stepped portions of the back plates 17, 27, and is located a short distance _d1 from the upper ends 17c, 27c of the stepped portions (see Figs. 5 and 7).
(see figure). For this reason, normally the retainer plate 3
1 presses the pads 15 and 25, but when the pads 15 and 25 move in the outer radial direction by the distance d ₁ or more, this retainer plate 31
The pad 15 comes into contact with the stop arm 31b of the
25 is prevented from slipping out.

Furthermore, as described above, the pad insertion space 19 is
As shown in FIG. 7, a squealing abrasion detector 3 for detecting abrasion of the lining 26 is attached to the inner end 27d of the back plate 27 of the outer pad 25 held within the pad.
6 is installed. This squeaking type wear detector 36 is formed of a plate material into the shape shown in FIG. 8, and is fixed to the inner diameter end 27d of the back plate 27 with a rivet 37.

The tip 36a of this squeaking type wear detector 36 is located on the same plane as the wear limit surface C of the lining 26. Therefore, when the outer pad 25 is pushed out by the piston 22 during brake operation with the lining 26 worn to the wear limit C, the tip 36a of the wear detection tool 36 touches the side surface 6 of the rotor 6.
b, this abrasion detection tool 36 vibrates in accordance with the rotation of the rotor 6 and emits a sound (squeal), and it is possible to detect from this sound that the lining 26 has been worn to its limit.

This squeaking type wear detector 36 is a lining 26
The projections 20 are attached to both ends 27d on the inner diameter side of the back plate 27 so as not to reduce the area of the
It is arranged so as to protrude toward the inner diameter side while avoiding the point e. Furthermore, as shown in FIG. 8, the outer pad 25 is prevented from protruding outward from the side surface as much as possible, and the outer pad 25 can be inserted into the pad insertion space 19 with the detection tool 36 attached, or this It is arranged so that it can be taken out from the space 19.

Here, an example is shown in which a squealing type wear detector 36 is attached to the outer pad 25, but it goes without saying that the same squealing type wear detector can be attached to the inner pad 15 in the same manner.

Opposed disc brake configured like this
In the BR, when brake hydraulic pressure is supplied into the cylinder holes 11 and 21 via the tubes 7 and 8,
This hydraulic pressure pushes out the pistons 12, 22 and presses the inner and outer pads 15, 25 toward the rotor 6. As a result, the linings 16 and 26 are attached to both sides 6a and 6 of the rotor 6.
b, and due to the frictional force generated thereby, both pads 15, 25 receive a force that causes them to rotate together with the rotor 6. At this time, inner pad 1
The side end 17a of the back plate 17 of the outer pad 25 is in contact with and received by the receiving surface 10c of the protrusion 10b, and the side end 27a of the back plate 27 of the outer pad 25 is received in contact with the receiving surface 20c, and the rotor 6
A braking force is applied to the rotor 6 to prevent its rotation.

In this way, the rotation of the rotor 6 is braked. In this example, heating of the rotor 6 during braking is prevented, and the linings 16 and 2 are
In order to increase the lifespan of 6, do as follows:
The outer diameter of the rotor 6 is made as large as possible.

First, in the case of the configuration of this example, only the retainer member 30 is provided on the outer diameter side of the inner and outer pads 15, 25, and no hanger pins as in the past are required, and the diameter of the rotor 6 is reduced accordingly. It becomes possible to do big things.

Furthermore, in the brake BR of this example,
As shown in FIGS. 4 and 6, the connecting surface B between the inner caliper 10 and the outer caliper 20 is located axially inward, and the connecting bolt 1
The coupling of both calipers 10 and 20 by 8 is performed on the inner side of the inner surface 6a of the rotor 6 in the axial direction. Therefore, the inner tip of the arm portion 20a of the outer caliper 20 is thickened to form a threaded portion for the coupling bolt 18, but the outer diameter end of the rotor 6
The inner surface 20b of the portion facing the rotor 6 has been shaved outward to become thinner, and the outer diameter of the rotor 6 is correspondingly increased.

In the example explained above, both pads 15, 2
The protrusions 10e, 20e that the inner diameter side ends of the back plates 17, 27 of No. 5 come into contact with are formed integrally with the inner and outer calipers 10, 20.
As shown in the figure, the protrusion may be formed by a pin member 29. In this way, the protrusion, i.e.
When the pin member 29 becomes worn or damaged, it is only necessary to replace it, which improves maintenance and maintainability.

C. Effect of the invention As explained above, according to the invention, when the inner and outer pads are inserted into the pad insertion space, their inner diameter ends abut against the protrusions, and their outer diameter ends contact the protrusions. Since the rotor is covered and held by the retainer member, there is no need for hanger pins as in the prior art, and the outer diameter of the rotor can be increased accordingly. Also, if the retainer member 30 is removed, both pads 1
5, 25 into the pad insertion space 19,
It can be taken out from this space, and both pads 15 and 25 can be easily attached and detached.

Furthermore, if the protrusion is constructed from a pin member attached to the caliper, only the pin member can be replaced without leaving the caliper as is, resulting in good maintenance and maintainability.

[Brief explanation of the drawing]

1 and 2 are a front view and a plan view showing an opposed disc brake according to the present invention, and FIG.
4, 5, and 7 are sectional views showing the opposed disc brake along the arrows -, -, -, and - in Fig. 1, respectively, and Fig. 6 shows the configuration of the disc brake. Fig. 8 is a side view showing how the squealing wear detector is installed; Fig. 9 is a sectional view showing different examples of protrusions on the caliper; Fig. 10 is a conventional one. FIG. 2 is a cross-sectional view showing an opposed type disc brake. 1... Anchor plate, 6... Rotor, 1
0, 20... Caliper, 10c, 20c... Reception surface, 11, 21... Cylinder hole, 12, 22
... Piston, 15,25 ... Padded, 17,2
7... Back plate, 30... Retainer member, 31... Retainer plate, 33... Spring plate,
36...Squeal type wear detection device.

Claims (1)

[Claims for Utility Model Registration] 1. An inner caliper and an outer caliper each having a slidable piston and integrally connected to each other, and an inner caliper and an outer caliper that sandwich a rotor from both sides in the axial direction and are disposed opposite to each of the pistons. , an opposed disc brake consisting of an inner pad and an outer pad that are pressed against the side surface of the rotor by the pistons to generate braking force, wherein the inner and outer calipers that are integrally connected have openings on the outer diameter side and the inner diameter side. A pad insertion space is formed, and protrusions projecting into the pad insertion space are formed at the inner end portions of the inner and outer calipers, respectively, and the inner and outer pads are inserted through the opening on the outer diameter side. The inner and outer pads are inserted into the pad insertion space by a retainer member that is inserted into the pad insertion space until the inner end abuts the protrusion and is attached to the outer and inner calipers while covering the pad insertion space from the outer diameter side. An opposed disc brake characterized in that it is configured to be held in a state inserted into the disc brake. 2. The opposed disc brake according to claim 1, wherein the protrusion is a pin member attached to the inner or outer caliper and protruding into the pad insertion space. 3. The protrusion is in contact with a part of the inner end of the inner or outer pad, and a squealing pad is provided in a portion of the inner end of the inner or outer pad that protrudes toward the inner diameter, avoiding the contact portion with the protrusion. 3. The opposed disc brake according to claim 1, further comprising a wear detector.