JPH031626Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field of the invention) The present invention relates to a vehicle disc brake used as a wheel brake of an automobile, and particularly to a vehicle with a disc rotor that rotates integrally with the wheel. A bifurcated pad that is formed in a shape that straddles from the outer periphery of the disc rotor an inner pad and an outer pad that are respectively disposed on the inside and outside of the vehicle and supported by torque members fixed on the inside of the disc rotor, and that is in contact with the back side of the back metal of the outer pad. It is equipped with a caliper having a cylinder shaped like an arm and containing a hydraulically actuated piston that comes into contact with the back metal back of the inner pad.
One end of the two ends of the disc rotor that are spaced apart in the circumferential direction is made slidable in the axial direction of the disc rotor and rotatable around the support pin by a single support pin in the axial direction of the disc rotor inside the vehicle. The present invention relates to a disc brake for a vehicle that is supported and whose rotation about the support pin is restricted by a rotation restriction means provided between the torque member and the torque member.

(Prior art) This type of disc brake is inferior in support rigidity to the torque member of the caliper compared to a disc brake in which the caliper is supported by two support pins at both ends, but when braking The rigidity of each part, the smooth sliding of the caliper in
It has the advantage of being able to guarantee manufacturing accuracy and assembly accuracy without increasing them.
There is one shown in Figure 0. In this disc brake, a caliper 1 slides on a torque member 3 at its right end 1a in FIG. It is supported movably and rotatably around a support pin 2, and both pads 5 and 6 are attached to the torque member 3 so as to be removable from the outer circumferential side of the disc rotor 4 and to be slidable in the axial direction. As a result, the caliper 1 contacts the protrusion 3a provided on the torque member 3 with the protrusion 1c provided on the right end 1b in FIGS. 8 and 9, and the rotation outward in the radial direction of the disc rotor 4 is restricted. , and as shown in FIG. 10, the bridge portion 1d
The disc rotor 4 is configured to abut against a back metal 5a of the inner pad 5 via a leaf spring 7 as a biasing member, thereby restricting the inward rotation of the disc rotor 4 in the radial direction. The leaf spring 7 urges the caliper 1 to rotate outward in the radial direction of the disc rotor 4, and elastically restricts the rotation of the caliper 1 inward in the radial direction of the disc rotor. Further, it is attached to the caliper 1 by a bolt 8 on the support pin 2, and is slidably inserted into a hole 3b provided in the torque member 3, and is sealed by a dust boot 9.

(Problems to be solved by the present invention) By the way, in a disc brake having such a configuration, it is necessary to remove the bolt 8 and the caliper 1 when replacing the pads, and when installing the caliper 1, it is necessary to remove the caliper 1 and the support pin 2. Maintainability is poor because the bolts 8 must be installed with sufficient attention to assembly accuracy (if this is not proper, smooth sliding of the caliper 1 will be hindered). Since the caliper 1 supports the torque member 3 only on the inner pad 5 side, the support rigidity of the caliper 1 with respect to the torque member 3 is low. The radially inward rotational force of the disc rotor 4 of the caliper 1 is transferred to the torque member 3 via the leaf spring 7 and the back metal 5a of the inner pad 5.
Since the pad is received by the pad support portion 3c, sliding resistance occurs between the caliper 1 and the leaf spring 7 or between the leaf spring 7 and the back metal 5a during braking operation, and the braking input is unnecessarily impaired. There are other problems.

Therefore, the present invention eliminates the need to uncouple the support pin and caliper (or torque member) when replacing pads, supports the caliper on the inside and outside of the vehicle of the disc rotor, and supports the caliper in one direction in the radial direction of the disc rotor. The object is to eliminate the above problem by preventing the force of the biasing member that biases the pad from being applied to the pad.

[Structure of the idea]

(Means for Solving the Problem) The means taken to solve the above problem is to provide concave locking portions that are spaced apart from each other at both ends of the back metal of the outer pad that are spaced apart in the circumferential direction of the disc rotor, and to The torque member is assembled to mutually opposing convex support portions provided at both ends of the torque member spaced apart in the circumferential direction of the disc rotor so as to be slidable only in the axial direction of the disc rotor, and a rotation regulating means is provided on the outside of the vehicle of the disc rotor. an engaging protrusion provided on at least the other end of the caliper and abutting the support portion at the other end of the torque member from the outside in the disk rotor radial direction; and a pair of opposing recesses provided in the arm of the caliper. The caliper is rotated inward in the radial direction of the disc rotor by bringing it into contact with the highly rigid center part that contacts the radially outward surface of the disc rotor and the support part of the torque member from the inside in the radial direction of the disc rotor. a pair of spring-acting ends that are biased to cause the engaging protrusion to contact the support portion from the outside in the radial direction of the disc rotor without causing the caliper to contact the outer pad; and a biasing member attached to the caliper. and a protrusion that protrudes from the back surface of the back metal of the outer pad so as to bring the center portion of the biasing member into contact with the disc rotor from the inside in the radial direction.

(Function) Therefore, by removing the biasing member, it is possible to rotate the caliper around the support pin, and the pad can be replaced, and the work is simple and does not require special consideration. Therefore, the maintainability when replacing the pads is superior to the conventional one, and the pads can be replaced easily and reliably. In addition, the caliper is supported by the torque member on the inside of the vehicle of the disc rotor by a support pin, and is supported by the torque member on the outside of the vehicle of the disc rotor by a rotation restriction means, so that the support rigidity of the caliper with respect to the torque member is reduced. This can be improved compared to the conventional example described above. Furthermore, the inward rotation of the caliper in the radial direction of the disc rotor is restricted by contact between the engaging protrusion and the support part, and the outward rotation of the caliper in the radial direction of the disc rotor is restricted by the force of the urging member or The force of the biasing member is not applied to the outer pad because the force is restricted by the contact between the central part of the biasing member and the protruding part of the back metal of the outer pad.
No unnecessary sliding resistance occurs during braking operation, and braking input is not unnecessarily impaired.

(Example) Hereinafter, an example of the present invention will be described based on the drawings. In the disc brake of the embodiment shown in FIGS. 1 to 6, a torque member 10 attached to a part of the vehicle body (for example, a knuckle arm) (not shown) connects a disc rotor 12 with bridge portions 10a and 10b at both ends. A part of the outer periphery is overhanging and supports the outer pad 14 and the inner pad 16. The outer pad 14 is attached to the lower side of the disk rotor 12 in FIG. 3 (outside the vehicle) at both left and right ends of the back metal 14a via shims 18 so as to be movable in the vertical direction in FIG. 3 (in the axial direction of the disk rotor 12). It is being The inner pad 16 is attached to the upper side of the disc rotor 12 in FIG. 3 (inside the vehicle) at both left and right ends of the back metal 16a via shims 18 so as to be movable in the vertical direction in FIG. 3. The shim 18 is made of a corrosion-resistant material (stainless steel), and as shown in FIGS. 1 and 4, the shim 18 has a U-shaped bent portion 18.
convex support portions 10c, 10d, 10e, 10 provided on the torque member 10,
f respectively. Each convex support part 1
0c, 10d and 10e, 10f are opposed to each other in the circumferential direction of the disc rotor 12.

Further, in this disc brake, a support pin 22 is screwed onto the upper left end in FIG. 3 of the torque member 10 located on the upper side in FIG. 3 of the disc rotor 12 and extends toward the upper side in FIG. 3. A caliper 24 is mounted on the support pin 22 at its left cylindrical portion 24a in FIG. 3 so as to be slidable and rotatable in the axial direction. Further, a dust boot 26 is installed between the support pin 22 and the cylindrical portion 24a of the caliper 24, and the sliding portion between the support pin 22 and the cylindrical portion 24a is sealed. The caliper 24 is formed in a shape that straddles both pads 14 and 16 from the outer periphery of the disc rotor 12, and has a bifurcated arm 24b that comes into contact with the back surface of the back metal 14a of the outer pad 14, and also has a bifurcated arm 24b that comes into contact with the back surface of the back metal 16a of the inner pad 16.
It has a cylinder 24c containing a hydraulically actuated piston 28 that comes into contact with the back surface, and the arm 24b and cylinder 24c are connected by a bridge portion 24d.

However, in this disc brake,
As shown in FIG. 1, the outer pad 14 is shimmed to the convex support portions 10c and 10d of the torque member 10 at concave locking portions _14a1 provided at both left and right ends of the back metal 14a in FIG. 18 so that it can slide only in the axial direction. Also,
In this disc brake, the caliper 24
Rotation around the support pin 22 is restricted by a rotation restriction means. The rotation regulating means is caliper 2.
4, and a protrusion 14 protruding from the back of the back metal 14a of the outer pad 14.
a ₂ , 14a ₂ and a biasing member 30 attached to the caliper 24. The protrusions 24e and 24f of the caliper 24 are connected to the torque member 10 from the outer circumferential side of the disc rotor 12 on the outer pad 14 side.
The caliper 24 is in contact with the convex support portions 10c and 10d via the shim 18, respectively, and restricts the inward rotation of the caliper 24 in the radial direction of the disc rotor 12. The biasing member 30 is formed of a plate material (for example, stainless steel) having spring properties and corrosion resistance, and is formed by opposing recesses 24g, 24g formed in the arm 24b of the caliper 24, on surfaces facing outward in the radial direction of the disc rotor. Highly rigid central portion 30a that comes into contact with
and the convex support portions 10c, 10 of the torque member 10.
a pair of spring-acting ends 30b and 30c that abut the disk rotor from the inside in the radial direction and urge the caliper 24 to rotate in the radial direction of the disk rotor;
Locking claws 30d and 3 provided on these spring acting ends 30b and 30c and locking into recesses 24h and 24h provided in the arm 24b of the caliper 24
0e, which elastically restricts the outward rotation of the caliper 24 in the radial direction of the disc rotor. Projection portion 14a ₂ , 1 of back metal 14a of outer pad 14
_4a2 is adjacent to the center portion 30a of the biasing member 30 on the outer side in the radial direction of the disk rotor, and restricts the rotation of the caliper 24 outward in the radial direction of the disk rotor.

In the disc brake configured as described above, when pressure fluid is supplied into the cylinder 24c of the caliper 24, the piston 28 moves toward the inner pad 16.
is pushed toward the disc rotor 12, and the caliper 24 pushes the outer pad 1 with its arm 24b.
4 toward the disk rotor 12,
The disc rotor 12 is held between the pads 14 and 16 and braked. At this time, torque member 1
0 is deformed by the braking reaction force applied via both pads 14, 16, the deformation is caused by the braking reaction force applied through both pads 14, 16.
6 and caliper 24 and convex support portions 10c, 10
d, 10e, and 10f, and no unreasonable force acts between the support pin 22 and the cylindrical portion 24a of the caliper 24, ensuring smooth sliding of the caliper 24.

By the way, in the disc brake configured as described above, the locking claws 30d and 30e of the biasing member 30 are removed from the recesses 24h and 24h of the arm 24b of the caliper 24 using an appropriate tool, and the biasing member 30 is removed. If the caliper 24 is removed from the caliper 24 by pulling it toward the outside of the vehicle, the caliper 24 can be rotated outward in the radial direction of the disc rotor 12 around the support pin 22.
4 and 16 can be exchanged. Further, after replacing both pads 14 and 16, the work can be completed by performing the above-described work in reverse. In this way, this disc brake can be disassembled and reassembled simply by attaching and detaching the biasing member 30, which does not require any special consideration when replacing the pads, making it easy to maintain. This allows pads to be replaced easily and reliably.

Further, in the disc brake configured as described above, the caliper 24 is connected to the disc rotor 12.
The caliper 24 is supported by the torque member 10 by the support pin 22 on the inside of the vehicle, and the disc rotor 12 is supported on the torque member 10 by rotation regulating means on the outside of the vehicle. This can be improved compared to the conventional example shown in FIGS. 8 to 10.

Furthermore, in the disc brake configured as described above, the disc rotor 12 of the caliper 24
Since the biasing member 30 that restricts inward rotation in the radial direction is disposed between the caliper 24 and the torque member 10, the force of the biasing member 30 is not applied to the pads 14, 16 and is unnecessary during braking operation. No sliding resistance occurs and braking input is not unnecessarily impaired.

In the embodiment described above, the attachment of the biasing member 30 to the caliper 24 is carried out between the locking claws 30d and 30e of the biasing member 30 and the recess 24 of the caliper 24.
h and 24h, but the attachment of the biasing member 30 to the caliper can be changed as appropriate.
For example, in another embodiment shown in FIG.
An ear portion 30f adjacent to the outside of the vehicle of the arm 24b of the caliper 24 is provided, and this ear portion 30f is fixed to the arm 24b of the caliper 24 with a bolt 31.

Further, in both embodiments described above, the biasing member 30 is formed as a single member, but the central portion 30a
It is also possible to form the spring action end portions 30b and 30c as separate bodies and to connect them together.

[Effect of idea]

As explained in detail above, in the present invention, the biasing member attached to the caliper engages with the torque member to urge the caliper to rotate inward in the radial direction of the disc rotor, and the caliper engages without contacting the outer pad. By bringing the protrusion into contact with the support portion from the outside in the radial direction of the disk rotor, no force from the biasing member is applied to both pads. It is also possible to rotate the caliper inward in the radial direction of the disc rotor by engaging the biasing member attached to the caliper with the outer pad, but in this case, the force of the biasing member is applied to the outer pad. In contrast, in the present invention, the sliding resistance of the outer pad is increased and the outer pad is tilted so that its outer edge in the radial direction of the disc rotor approaches the disc rotor, and the outer pad remains in contact with the disc rotor when the brake is released. Since the force of the biasing member is not applied to the outer pad, there is an effect that when the brake is released, the outer pad also reliably separates from the disc rotor due to the deflection or vibration of the disc rotor.

Furthermore, since the engaging protrusion of the caliper and the biasing member are located at approximately the same position in the axial direction of the disc rotor, the biasing force of the biasing member hardly applies any moment that would tilt the caliper with respect to the disc rotor axis. , the sliding resistance of the caliper is small and the caliper slides smoothly.

Furthermore, since the mass caused by the vibration of the outer pad does not act on the biasing member, high strength is not required, making it possible to downsize the biasing member and improve ease of assembly. can.
In addition, since the force of the biasing member is not applied to the outer pad, the vibration of the outer pad is difficult to be transmitted to the caliper, and brake vibration due to caliper vibration (hydraulic vibration generated due to caliper vibration causes unpleasant vibration to the brake pedal). ) can be prevented from occurring.

[Brief explanation of drawings]

Figures 1 to 6 show an embodiment of the present invention, with Figure 1 being a front view and Figure 2 being the - in Figure 1.
3 is a plan view, FIG. 4 is a rear view, and FIG. 5 is a sectional view taken along the - line in FIG.
6 is a view showing the biasing member 3 in FIG. 5, FIG. 7 is a view showing another embodiment of the present invention, FIG. 8 is a front view showing an example of a conventional movable caliper type disc brake, and FIG. 9 is a plan view of the same, and FIG. 10 is a partially broken rear view of the same. Explanation of symbols, 10... Torque member, 10c,
10d... (convex) support part, 12... disk rotor, 14... outer pad, 14a... back metal,
14a ₁ ... (concave) locking part, 14a ₂ ... protrusion part,
16...Inner pad 1, 16a...Secret money, 22
...Support pin, 24...Caliper, 24b...Arm, 24c...Cylinder, 24e, 24f...
Engagement protrusion, 24g... recess, 28... piston,
30...Biasing member, 30a...Central part, 0b, 3
0c...Spring action end.

Claims (1)

[Scope of utility model registration request] The inner pad and the outer pad are respectively disposed on the inside and outside of the vehicle of a disc rotor that rotates integrally with the wheel and are supported by torque members fixed on the inside of the disc rotor. The caliper has a bifurcated arm that comes into contact with the back surface of the outer pad, and has a cylinder containing a hydraulically actuated piston that comes into contact with the back surface of the inner pad. One end of the two ends separated in the direction is supported by one support pin in the axial direction of the disc rotor on the inside of the vehicle of the disc rotor so as to be slidable in the axial direction of the disc rotor and rotatable around the support pin. In the disc brake for a vehicle, the rotation around the support pin is restricted by a rotation restriction means provided between the outer pad and the torque member, in which the back metal of the outer pad is provided at both ends spaced apart in the circumferential direction of the disc rotor. a releasable concave locking portion is provided, and the outer pad is assembled to mutually opposing convex support portions provided at both ends of the torque member spaced apart in the disk rotor circumferential direction so as to be slidable only in the disk rotor axial direction; an engagement protrusion that is provided on at least the other end of the caliper on the outside of the vehicle of the disc rotor and abuts on the support portion of the other end of the torque member from the outside in the radial direction of the disc rotor; A highly rigid central portion of a pair of opposing recesses provided in the arm of the caliper is brought into contact with a surface facing outward in the radial direction of the disc rotor, and the supporting portion of the torque member is brought into contact with the disc rotor from the inside in the radial direction. a pair of springs that contact and urge the caliper to rotate inward in the radial direction of the disc rotor, causing the engaging protrusion to abut the support portion from the outside in the radial direction of the disc rotor without the caliper coming into contact with the outer pad; a biasing member having a working end portion and attached to the caliper; and a protruding portion protruding from the back of the back surface of the outer pad so as to abut the central portion of the biasing member from inside in the radial direction of the disc rotor. A vehicle disc brake made up of: