JP4481074B2 - Floating brake disc - Google Patents

Description

  The present invention relates to a floating brake disc used for a braking device such as a motorcycle.

  In recent years, floating brake discs are often used in braking devices such as motorcycles.

  This floating brake disc is divided into an annular rotor with which a pad is pressed and a hub concentrically arranged inside the rotor, and the rotor and the hub are equidistant from each other while maintaining a predetermined gap. It is couple | bonded by the coupling part provided in. For example, the coupling portion forms a pin hole, and the rotor and the hub are coupled to each other while maintaining the gap by loosely fitting a caulking pin into the pin hole.

  By maintaining the gap in the coupling portion, distortion due to thermal expansion of the rotor during braking can be absorbed, and uneven wear of the sliding portion, reduction in braking force, and the like can be prevented.

  The hub has a drive shaft attached to a mounting portion whose center is opened in an annular shape, and torque is transmitted to the rotor via the coupling portion during traveling. On the other hand, at the time of braking, if the rotor is sandwiched between the pads, braking torque acts from the rotor to the hub.

  For example, at the time of braking, a large load, that is, a shearing force acts on the hub from the coupling portion due to the rotating force of the hub and the force of stopping the rotor. In order to prevent the hub from being damaged by the shearing force, it is necessary to provide a number of joints that can withstand the shearing force to distribute the load.

  The above-mentioned shear force is only an example of a load acting on the hub during braking, and it is considered that various loads such as radial force and bending moment act on the hub, including loads during traveling. .

  In recent years, as the output of engines has increased, the load has increased. Therefore, in order to improve the rigidity of the entire disk, the number of the coupling portions must be increased. On the other hand, the increase in the joints leads to an increase in the weight of the entire disk, and there is a possibility that the fuel consumption will be affected. In addition, the handle operability was also affected.

  Therefore, conventionally, in order to reduce the weight of the entire disk, a plurality of openings are provided in the hub (see, for example, Patent Document 1).

  Referring to FIG. 2, reference numeral 100 is an example of the conventional brake disc. The brake disc 100 includes an annular rotor 200, a hub 300 concentrically disposed inside the rotor 200, and coupling portions 400a and 400b that couple the rotor 200 and the hub 300 via a predetermined gap.

  In this example, the coupling portion is engaged with a recess provided in the hub 300 at a position opposed to the protrusion 400a in which the caulking pin 410 is loosely fitted and a protrusion protruding in the radial direction from the rotor 200. 400b is alternately arranged at equal intervals in the circumferential direction, but all the coupling portions may be coupled by caulking pins as in 400a. Further, in this prior art, the coupling portions 400a and 400b are provided at four locations, respectively, for a total of eight locations. However, if the rigidity needs to be improved by, for example, engine output, the number of the coupling portions is reduced. Increase it.

  In the center of the hub 300, an annular mounting portion 310 for mounting a drive shaft (not shown) is concentrically arranged. In the radial direction of the hub 300, a shaft portion 320 and a concentric annular shaft portion 330 are formed between the rotor 200 and the mounting portion 310 from the coupling portions 400 a and 400 b toward the mounting portion 310. Eight openings 340 are provided.

The annular shaft 330 improves the rigidity of the hub 300 by distributing the load applied from the coupling portions 400a and 400b or the shaft 320 in a well-balanced manner during traveling and braking, while improving the rigidity of the hub 300, while the opening 340 reduces the weight of the entire hub 300. I was planning.
JP 2002-227891 A (Embodiment of the Invention)

  However, as described above, various loads such as radial force, shearing force, and bending moment are applied to the brake disc by running or braking, so if too many openings are provided to reduce the weight of the hub, There was a risk that the rigidity of the hub would decrease.

  If further increase in engine output is pursued in the future, it will be necessary to increase the number of joints between the rotor and the hub. To reduce the weight of the entire disk, the weight reduction of the hub becomes an even more important issue.

  Therefore, for example, as in the above-described prior art, providing the hub with the annular shaft portion concentric with the rotor is indispensable for improving the rigidity of the hub, but for reducing the weight of the entire disk. Then it was an obstacle.

  In order to reduce the weight by providing an opening in the hub, the annular shaft portion is not necessarily essential. However, when the annular shaft portion is not formed, the rigidity is higher than when the annular shaft portion is formed. Since it may be reduced, the size and number of openings are considered to be significantly limited.

  Therefore, in view of the above problems, an object of the present invention is to provide a floating brake disc having a hub that can be made lighter than ever and can improve rigidity.

In order to solve the above-described problems, a brake disk according to the present invention includes an annular rotor with which a pad is in pressure contact during braking, and a hub concentrically disposed inside the rotor, and a predetermined gap is provided between the rotor and the hub. of maintaining the gap bound with a binding portion provided at equal intervals in the circumferential direction, in a floating type brake disc mounting portion of the annular mounting the drive shaft is opened at the center of the hub, the coupling portions A truss-like shape having an opening between the two shaft portions, in which the connecting portion and the mounting portion are connected in a divergent manner in the direction of the mounting portion without providing an annular shaft portion to be connected. The support piece is formed, and the support pieces are arranged at equal intervals in the circumferential direction, and a shaft portion constituting the support piece and a shaft portion constituting another support piece adjacent to the shaft portion are provided. Superimpose them so that they cross each other. Characterized in that a truss-shaped opening to node and an outer contact point between the outer peripheral portion of the intersection and the mounting portion of the shaft portion obliquely intersect the allowed part.

  According to this configuration, since the truss-like opening is formed between the coupling portion and the attachment portion, the load applied to the hub is only the radial force on the shaft portion, that is, the compressive force and the tensile force. .

  If the support piece is formed so that the two shaft portions are equilateral, the load applied from the coupling portion to the hub is equally divided between the two shaft portions.

Further, as in the present invention, the shaft portion constituting the support piece and the shaft portion constituting the other support piece adjacent to the shaft portion are overlapped so as to be oblique to each other, and the overlapped portion is inclined. If a truss-like opening is provided with the intersection of each intersecting shaft part and the outer contact point of the outer periphery of the mounting part as a nodal point, the load divided from the joint part to the two shaft parts will be However, the force is again divided into two from the intersection point toward the mounting portion.

  Furthermore, you may provide the said outer contact in the midpoint of both the outer contacts of the two axial parts which comprise the other support piece which adjoins. In this case, the two shaft portions of the support piece share the outer contact at the midpoint with the shaft portions of the other support pieces adjacent to each other.

  It should be noted that the number of coupling portions may be greater than that of conventional brake discs, for example, 10 or 12 coupling portions.

  As is clear from the above description, in the brake disc according to the present invention, the opening provided in the hub has a truss shape, so that all the loads acting on the nodes are radial force ( Compression force and tensile force), and the hub is less likely to be deformed even if a larger load is applied to the hub than in the past.

  Therefore, since it is possible to improve the rigidity without providing the hub with a concentric annular shaft, the weight can be reduced more than before even if the number of coupling points is increased as the engine output increases. It is possible to improve fuel efficiency.

  In addition, if the support piece is configured so that the two shaft portions are equilateral, the load applied to the hub from the joint portion is equally distributed to the two shaft portions, and therefore equal to any shaft portion. Thus, the rigidity of the entire hub can be improved.

  Furthermore, the shaft portion constituting the support piece and the shaft portion constituting the other support piece adjacent to the shaft portion are superimposed so as to be oblique to each other, and each shaft portion obliquely intersected with the overlapped portion. If a truss-shaped opening having a node at the outer contact point between the intersection point and the outer peripheral portion of the mounting portion is provided, the load divided from the joint portion to the two shaft portions is synthesized at the intersection point. However, since the force is again divided into two from the intersection point toward the attachment portion, the rigidity can be improved even if the number of openings is increased to reduce the weight.

  Referring to FIG. 1, reference numeral 1 denotes a floating brake disc according to the present invention. The brake disk 1 is composed of an annular rotor 11 with which a pad (not shown) is in pressure contact during braking and a hub 12 disposed concentrically with the rotor 11.

  The rotor 11 has a plurality of circular holes 11a in the circumferential direction. The holes 11a prevent wear powder, moisture, mud, etc. during braking from staying in the rotor 11 and contribute to weight reduction.

  In the circumferential direction of the inner peripheral edge of the rotor 11, there are twelve protrusions 11 b that are formed in a semicircular concave shape and protrude radially inward at equal intervals.

  The hub 12 includes a substantially trapezoidal support piece 121 continuously arranged in the circumferential direction inside the rotor 11 and an annular mounting portion 122 concentric with the rotor 11 provided inside.

  The tip 121a of the support piece 121 is formed in a semicircular concave shape like the protruding portion 11b. The tip 121a is disposed to face the protrusion 11b with the gap 13 therebetween, forming an annular hole. A caulking pin 14 is loosely fitted in the annular hole to form a coupling portion 15 that couples the rotor 11 and the hub 12. Here, it may be a floating brake disc held in the coupling portion 15 via an elastic member such as a spring.

  Since this gap 13 absorbs distortion due to thermal expansion of the rotor 11 during braking, it is possible to prevent uneven wear of the sliding portion with the pad, reduction in braking force, and the like.

  The coupling between the rotor 11 and the hub 12 is not limited to the present embodiment as long as it is a floating brake disc. In the present embodiment, the number of coupling portions 15 is twelve. However, the number is not limited to twelve, and depends on the engine output of the vehicle using the brake disk, for example, ten. It may be individual.

  An opening 122a is formed inside the attachment portion 122, and a drive shaft (not shown) is attached. In the circumferential direction of the attachment portion 122, six attachment holes 122b are opened. The drive shaft is fixed to the mounting hole 122b by screwing it with a mounting screw.

  By the way, the brake disc 1 can achieve weight reduction by providing an opening in the hub 12. On the other hand, if a large number of openings are provided, the rigidity of the entire brake disc 1 may be reduced.

  Therefore, in order to reduce the weight by providing a large number of openings, the shape of the openings may be trussed so as not to reduce the rigidity. If the shape of the opening of the hub 12 is a truss shape, the load applied to the hub 12 is only a radial force, and a stable shape that is difficult to deform with respect to the load is obtained.

  Accordingly, if a large number of openings formed by the truss-shaped shaft portion 121b are provided in order to reduce the weight of the hub 12, it is possible to improve the rigidity of the hub 12 while reducing the weight as compared with the conventional case.

  In the present embodiment, two shafts having the same length are provided between the coupling portion 15 and the mounting portion 122 by providing a substantially pentagonal opening portion 121c with the tip portion 121a side as a base inside the support piece 121. The support piece 121 was formed in the shape of a truss by connecting the end portion 121b toward the attachment portion 122 in a divergent manner.

  Further, the shaft portion 121b constituting the support piece 121 and the shaft portion 121b constituting the other support piece 121 adjacent to the shaft portion 121b are superposed so as to cross each other, and the superposed portion is obliquely crossed. A substantially triangular opening 121f having an apex at an intersection 121e of each shaft 121b and an outer contact 121d between the outer peripheral edge of the mounting portion 122 is provided. The three vertices of the opening 121f function as truss nodes when a load is applied.

  In the present embodiment, the outer contact 121d is a midpoint between the two outer contacts 121d of the two shaft portions 121b constituting the other support piece 121 adjacent to the shaft portion 121b.

  For example, the force acting on the hub 12 via the coupling portion 15 during braking is equally divided into the two shaft portions 121b as a radial force. The radial forces divided by the shafts 121b are combined at the intersection 121e, but are again applied to the sides constituting the opening 121f from the intersection 121e toward the mounting portion 122.

  With the above configuration, even if a large number of openings are provided without an annular shaft portion as in the prior art, since the openings 121c and 121f are truss-shaped, the load is only a radial force, It becomes possible to improve rigidity.

  Note that this embodiment is merely an example, and the present embodiment is not limited to this embodiment as long as it matches the gist of the present invention. Therefore, for example, the shaft portion 121b may be continuously arranged without overlapping, the shaft portion 121b may not have the same length, and the outer contact 121d of the oblique shaft portion 121b is an oblique shaft. It does not have to be the midpoint between the two outer contacts 121d of the two shaft portions 121b constituting the other support piece 121 adjacent to the portion 121b.

    According to the present invention, the floating brake disc can be reduced in weight and rigidity, and thus can be applied as a brake disc in the field of manufacturing a braking device such as a motorcycle.

Front view of brake disc according to the present invention Front view of conventional brake disc

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Brake disc 11 Rotor 12 Hub 13 Crevice 14 Caulking pin 15 Connection part 121 Supporting piece 122 Attachment part

Claims (3)

Coupling provided with an annular rotor with which a pad is pressed during braking and a hub concentrically arranged inside the rotor, with a predetermined gap between the rotor and the hub, provided at equal intervals in the circumferential direction In the floating type brake disc that is joined at the center and the annular mounting portion for mounting the drive shaft at the center of the hub is opened,
An opening is provided between the two shaft portions that connects the joint portion and the attachment portion in a divergent manner in the direction of the attachment portion without providing an annular shaft portion for connecting the joint portions to each other. Forming a truss-shaped support piece having a portion, provided with a hub in which the support pieces are arranged at equal intervals in the circumferential direction,
The shaft portion constituting the support piece and the shaft portion constituting the other support piece adjacent to the shaft portion are superimposed so as to obliquely cross each other, and the intersection of each shaft portion obliquely intersected with the overlapped portion. And a truss-shaped opening having a node at an outer contact point between the outer peripheral portion of the mounting portion and the mounting portion . Said outer contact, floating type brake disc according to claim 1 Symbol mounting, characterized in that the midpoint of the both outer contact of the shaft portion of the two constituting the other adjacent support pieces. The floating brake disk according to claim 1 or 2 , wherein the number of coupling portions is 10 or 12.

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