JP6649204B2 - Floating brake disc - Google Patents

Description

  The present invention relates to a floating type brake disk used for a disk brake device of a motorcycle or the like, and more particularly, to a floating type brake disk provided with an annular rotor and a hub disposed inside the rotor, wherein the rotor is biased against the hub. In which the rotor and the hub are connected so that the rotor can be displaced in the axial direction against the urging force.

  This type of floating type brake disk is known, for example, from Japanese Patent Application Laid-Open No. H11-163,837. In this rotor, a plurality of tongue-shaped protrusions extending inward in the radial direction are formed at predetermined intervals in the circumferential direction on the inner peripheral edge of the rotor, and the outer peripheral edge of the hub is formed with a diameter corresponding to the protrusion. A receiving recess which is recessed inward in the direction to receive the protruding piece is formed. The hub is arranged inside the rotor such that each protruding piece is positioned in each receiving recess of the hub, and a connecting pin having a flange at one end is formed near the receiving recess of the hub from the other end. And the flange portion of the connecting pin is brought into contact with the projecting piece and one surface of the hub in the axial direction, respectively. Finally, the body portion of the connecting pin protruding from the pin insertion hole of the hub to the other axial side of the rotor and the hub is provided with a disc spring as biasing means, and the protruding piece and the other axial surface of the hub, respectively. By sequentially extrapolating the abutting washers and caulking the tip of the body, the rotor and the hub are displaced in the axial direction against the hub in such a manner that the rotor can be displaced in one axial direction against the urging force of the urging means. Be linked.

  Here, in the above-mentioned floating type brake disk, the rotor is sandwiched by the brake pad during the brake operation for transmitting the braking force to the axle. At this time, the projection comes into contact with the receiving recess of the hub. For this reason, when the brake operation is repeated, there is a problem that the hub is locally worn due to the contact of the projecting pieces, and the durability is impaired.

JP 2013-53738 A

  In view of the above, it is an object of the present invention to provide a floating brake disc that can prevent local wear of a hub even when brake operation is repeated.

In order to solve the above-mentioned problem, an annular rotor and a hub arranged inside the rotor are provided, such that the rotor is axially displaceable relative to the hub against the urging force of the urging means. The floating type brake disk of the present invention in which the rotor and the hub are connected to each other has a plurality of tongue-shaped protrusions extending radially inward at predetermined intervals in the circumferential direction on the inner peripheral edge of the rotor. A receiving recess is formed at the outer peripheral edge portion, corresponding to the projecting piece, and is recessed inward in the radial direction to receive the projecting piece, and the urging means contacts the one surface of the projecting piece in the axial direction. A first contact portion, a second contact portion that contacts one surface of the hub in the axial direction, and a flexure plate portion that allows the first contact portion to flex in the axial direction with respect to the second contact portion. , the first contact portion, and a buffer plate portion inserted in the rotation direction ahead of the clearance of the rotor between the protrusion and the receiving recess Another buffer plate portion inserted into the gap between the protruding piece and the receiving recess in the rear direction of rotation of the rotor is integrally formed, and the body of the connecting pin is formed radially inward of the receiving recess so as to be continuous with the receiving recess. A pin insertion hole through which the connecting pin is inserted is formed, and another pin insertion hole through which the body of the connecting pin is inserted is formed in the flexible plate, and the connecting pin is bent through both pin inserting holes. It is characterized in that it is configured to have an axial gap between the plate portion, the protruding piece and one surface of the hub in the axial direction .

According to the present invention, the buffer plate is interposed between the protrusion and the receiving recess in a state where the rotor and the hub are connected, so that the protrusion contacts the buffer plate during the brake operation, so that the hub is connected to the hub. The occurrence of local wear is prevented, and as a result, there is no problem that the durability of the hub is impaired. Further, when the urging means is inserted into the gap between the projecting piece and the receiving recess respectively from the tip end side of the buffering plate portion, the projecting piece is formed by the first contact portion and the both buffering plate portions. Therefore, the positioning of the urging means can be easily performed, which is advantageous.

In the present invention, it is preferable that the pin insertion hole formed in the hub has a diameter larger than the circumferential width of the protruding piece.

  Further, in the present invention, it is preferable that the first contact portion and the second contact portion have flat surfaces which are in surface contact with one surface of each of the projecting pieces and the hub in the axial direction. According to this, when connecting the rotor and the hub using the connecting pin, both flat surfaces of the first contact portion and the second contact portion abut on one surface of the projecting piece and the hub, respectively. Since the rotor and the hub can be prevented from coming off in the axial direction by being stopped, the washer used in the above-described conventional example can be omitted, which is advantageous.

The rear view which shows the floating type brake disk of embodiment of this invention. (A) And (b) is a side view and a rear view of an urging means. FIG. 4 is an exploded partial perspective view illustrating the connection between the rotor and the hub, as viewed from the rear side of the brake disk. Sectional drawing which shows the connection state of a rotor and a hub. FIG. 5 is a sectional view taken along the line VV in FIG. 4.

  Hereinafter, an embodiment of a floating brake disc BD of the present invention mounted on a motorcycle will be described with reference to the drawings.

  Referring to FIG. 1, a BD is a floating brake disc of the present embodiment. The floating brake disc BD includes an annular rotor 1 and a hub 2 disposed inside the rotor 1. The connecting pin 4 connects the rotor 1 and the hub 2 so that the rotor 1 can be displaced in the axial direction against the urging force of the urging means 3. In FIG. 1, the one located at the bottom is shown without the connecting pin 4 attached.

  The rotor 1 is made of, for example, a stainless steel plate and is formed in an annular shape. When the brake is operated, the rotor 1 is sandwiched between brake pads (not shown) integrated on the front and back sides, and transmits a braking force to an axle (not shown) via the hub 2. A plurality of tongue-shaped (rectangular as viewed from the front) tongues 11 extending inward in the radial direction are formed at predetermined intervals in the circumferential direction on the inner peripheral edge of the rotor 1. The rotor 1 is provided with a plurality of circular through holes (holes) 12 as viewed from the front, which penetrate in the thickness direction to reduce the weight.

  The hub 2 disposed inside the rotor 1 is made of, for example, an aluminum alloy. The hub 2 has a central shaft hole 21 and a plurality of large, medium, and small through holes 22 that penetrate in the thickness direction to reduce the weight. Are formed respectively. Then, it is connected to an axle (not shown) via a mounting hole 23 formed around the shaft hole 21. On the outer periphery of the hub 2, receiving recesses 24 are formed, corresponding to the respective projecting pieces 11, which are recessed inward in the radial direction and receive the respective projecting pieces 11. The receiving recess 24 has a receiving surface that is substantially parallel to both side surfaces along the radial direction of the projecting piece 11, and the width between both receiving surfaces is formed slightly larger than the circumferential width of the projecting piece 11. Further, a pin insertion hole 25 is formed radially inward of each of the receiving recesses 24 so as to be continuous with the receiving recesses 24 and through which a body portion 41 of the connecting pin 4 described later is inserted. In this case, the diameter of the pin insertion hole 25 is formed larger than the circumferential width of the protruding piece 11.

  Referring also to FIGS. 2 and 3, the biasing means 3 is formed of a single metal plate material such as a stainless steel plate and has a first contact surface having a flat surface that is in surface contact with one surface of the protruding piece 11 in the axial direction. A contact portion 31, a second contact portion 32 having a flat surface that is in surface contact with one surface of the hub 2 in the axial direction, and a second contact portion located between the first contact portion 31 and the second contact portion 32. A flexure plate portion 33 that allows the first contact portion 31 to flex in the axial direction with respect to the two contact portions 32. The width of the first abutting portion 31 is formed to be equal to the width of the protruding piece 11, and is inserted into a gap formed between the protruding piece 11 and the receiving recess 24 at both ends thereof. The buffer plate portions 34, 34 abutting on both side surfaces along the radial direction of the vehicle are provided upright. The axial lengths of the buffer plates 34, 34 are sized so as to be shorter than the plate thickness of the rotor 1. Further, the flexible plate portion 33 is formed so as to have a substantially circular contour, and another pin insertion hole 33a through which a body portion 41 of the connection pin 4 described later is inserted is formed in a central portion thereof.

  The connecting pin 4 is composed of a cylindrical body 41 and a flange 42 provided at one end of the body 41, and the flange 42 contacts the protruding piece 11 and the other axial surface of the hub 2. And plays the role of locking the surface side. Hereinafter, a procedure for connecting the rotor 1 and the hub 2 will be specifically described with reference to FIGS. 4 and 5.

  The hub 2 is arranged inside the rotor 1 such that each protruding piece 11 of the rotor 1 is located in each receiving recess 24 of the hub 2. Next, the urging means 3 is inserted into the gap between the protruding piece 11 and the receiving recess 24 with the leading end sides of the buffer plates 34, 34 as the leading ends from one side in the axial direction. The first contact portion 31 is installed so as to contact one surface of the projecting piece 11 in the axial direction. In this state, both buffer plate portions 34 and 34 come into surface contact with both side surfaces of the protruding piece 11 along the radial direction, respectively. Next, from the other side in the axial direction, the body portion 41 of the connecting pin 4 is inserted into the pin insertion hole 25 and the pin insertion hole 33a of the flexible plate portion 33 with the other end first, and the flange portion 42 is inserted into the projecting piece 11 and The hub 2 is brought into contact with one surface in the axial direction. At this time, the connection pin 4 is positioned by the pin insertion hole 25 formed in the hub 2. Then, the washer 5 is extrapolated to the tip of the body 41 that protrudes from the pin insertion hole 25 to one axial side of the rotor 1 and the hub 2, and finally, the tip of the body 41 is swaged to fix the rotor 1. And the hub 2 are connected. In this case, the washer 5 may be omitted and the tip of the body 41 may be directly caulked against the flexible plate 33.

  Here, in the above-mentioned conventional floating type brake disk, during a brake operation for transmitting a braking force to the axle, the rotor is sandwiched by a brake pad (not shown). At this time, the protrusion comes into contact with the receiving recess of the hub. . Therefore, when the brake operation is repeated, the hub is locally worn due to the contact of the protruding pieces, and the durability is impaired. This becomes more remarkable when the rotor 1 is made of a stainless steel plate and the hub 2 is made of an aluminum alloy as in the above embodiment.

  On the other hand, in the above-described embodiment, the buffer plates 34, 34 are interposed between the projection 11 and the receiving recess 24 in a state where the rotor 1 and the hub 2 are connected. The contact with the buffer plate 34 prevents the hub 2 from being locally worn, and as a result, does not cause a problem that the durability of the hub 2 is impaired. Further, when the buffer plates 34, 34 are integrally provided on both sides in the circumferential direction of the first contact portion 31, and the urging means 3 is installed as described above, the first contact portion 31 and the both buffer plate portions 34, 34 are provided. Since the abutment 34 contacts the protruding piece 11, the urging means 3 can be easily positioned, which is advantageous. Further, the first contact portion 31 and the second contact portion 32 have flat surfaces that are in contact with one surface in the axial direction of each of the protruding pieces 11 and the hub 2, respectively. The two abutment portions 32 abut against and engage with one surfaces of the protruding piece 11 and the hub 2, respectively, so that the rotor 1 and the hub 2 can be prevented from coming off in the axial direction. The retaining washer that was previously used can be omitted, which is advantageous.

  The embodiments of the present invention have been described above, but the present invention is not limited to the above. In the above-described embodiment, an example has been described in which the buffer plates 34, 34 are integrally provided on both sides in the circumferential direction of the first contact portion 31. Then, local wear on the hub 2 can be prevented. In the above embodiment, the receiving recess 24 and the pin insertion hole 25 have been described as an example. However, the present invention is not limited to this. 2 may be formed independently and adjacent to each other.

  BD: brake disc, 1: rotor, 11: projecting piece, 2: hub, 24 ... receiving recess, 25 ... pin insertion hole, 3 ... urging means, 31 ... first contact portion, 32 ... second contact portion Reference numeral 33 denotes a flexible plate portion, 34 denotes a buffer plate portion, 4 denotes a connecting pin, 41 denotes a body portion, and 42 denotes a flange portion.

Claims (3)

An annular rotor, and a hub disposed inside the rotor, wherein the rotor and the hub are connected to each other so that the rotor can be displaced in the axial direction against the hub against the urging force of the urging means. Floating type brake disc,
On the inner peripheral edge of the rotor, a plurality of tongue-shaped protrusions extending radially inward are formed at predetermined intervals in the circumferential direction, and on the outer peripheral edge of the hub, corresponding to the protrusions, radially inward. In the case where the receiving recess is formed to be recessed and receive the projection,
The urging means includes a first contact portion in contact with one axial surface of the protruding piece, a second contact portion in contact with one axial surface of the hub, and a first contact with the second contact portion. A flexure plate portion that allows the portion to flex in the axial direction; a first contact portion; a buffer plate portion that is inserted into a gap between the projection and the receiving recess in the front of the rotor in the rotation direction ; And another buffer plate portion to be inserted into the clearance in the rotational direction of the rotor between the receiving recess and the rotor are integrally formed,
A pin insertion hole is formed radially inward of the receiving recess, through which the body of the connecting pin is inserted so as to be continuous with the receiving recess.
Another pin insertion hole through which the body portion of the connection pin is inserted is formed in the flexible plate portion. A floating type brake disc characterized by having an axial gap between the brake disc and a surface. The floating type brake disk according to claim 1, wherein the pin insertion hole formed in the hub has a diameter larger than a circumferential width of the protruding piece .   The said 1st contact part and the 2nd contact part have a flat surface which respectively comes in surface contact with one surface of each axial direction of each protrusion and a hub, The Claim 1 or Claim 2 characterized by the above-mentioned. Floating brake disc.

Images