JP2006336670A - Floating type disk brake - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a floating type disk brake having a brake disk capable of providing a high degree of freedom of the working amount of an energizing means and assemblable easily. <P>SOLUTION: The energizing means 3 comprises a base part 31 and a plate-like spring part 32 acting on a braking rotor bent at an obtuse angle relative to the base part. The floating type disk brake comprises restriction means 4 and 5 preventing the energizing means from falling by restricting the base part in the axial direction. The braking rotor is connected to the hub through the restriction means in such a state that the braking rotor can be axially energized by the energizing means. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

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

  In this type of disc brake, the braking rotor and the hub attached to the axle are separated from each other so that problems such as deformation of the braking rotor itself can be prevented even when braking by braking operation is repeated. The brake disk is formed by connecting the brake rotor and the hub via a predetermined gap so as to absorb the thermal expansion of the brake rotor through this gap.

  In this case, a first connection recess is formed at a predetermined interval on the inner peripheral edge of the brake rotor, and a second connection recess that can be abutted against the first connection recess is formed on the outer peripheral edge of the hub. Then, the brake rotor and the hub are connected to each other by caulking the connection pin in the hole that is the connection portion formed when the respective connection recesses are butted and assembled to prevent the brake rotor from coming off from the hub. The

Also, an urging means, which is a disc spring, is provided on the body portion of the linking pin so as to be positioned between the linking pin and the axial surface of the brake rotor and the hub. The braking rotor and the hub are connected in a floating state by urging in the direction (Patent Document 1).
Japanese Unexamined Patent Application Publication No. 2002-303342 (for example, refer to the description in the scope of claims)

  However, in the above, since the connecting pin is caulked in a state in which the biasing means is externally fitted on the body portion of the connecting pin, for example, if the caulking of the connecting pin is strong, the spring characteristic of the biasing means is limited. In addition, the floating amount is regulated. On the other hand, if the caulking of the connecting pin is weak, the urging in the axial direction becomes insufficient, and there is a possibility that the connecting part may come off when a large centrifugal force is applied in the radial direction. For this reason, it is necessary to caulk the connecting pin with high accuracy, and the assembly work is troublesome.

  In addition, when a disc spring is used as the biasing means, the degree of freedom of the acting amount in the axial direction is low, and in order to increase the acting amount in the axial direction and increase the floating amount, It is necessary to use a disk spring having a diameter. In this case, the heat distribution in the braking rotor surface is likely to be non-uniform during braking, and if braking is repeated, the braking rotor may be thermally deformed or deteriorated.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a floating brake disc that has a simple structure, has a high degree of freedom in the amount of action of the biasing means, and is easy to assemble.

  In order to solve the above-mentioned problems, a floating disk disc according to the present invention includes a braking rotor and a hub disposed inside the braking rotor, in a state where the braking rotor is biased in the axial direction by a biasing means. A floating type disc brake in which a braking rotor and a hub are connected, wherein the urging means is composed of a base and a plate-like spring portion acting on the braking rotor bent at an obtuse angle with respect to the base, and the base is There is provided a restricting means for restricting in the axial direction to prevent the urging means from falling off.

  According to the present invention, when the hub is assembled inside the braking rotor, the urging means is set so that the braking rotor is urged in the axial direction, and in this state, the regulating means for preventing the urging means from dropping off. To connect the brake rotor and the hub. In this case, by using an urging means having a plate-like spring portion bent at an obtuse angle with respect to the base portion, the urging means such as a disc spring is provided on the body portion of the connecting pin so as to be fitted over the body. The degree of freedom of the amount of action can be increased, and in addition, since the direction of action on the braking rotor and the direction of restriction by the restricting means coincide with each other, the structure of the biasing means may be simplified. Further, since the edge portion is not in contact with a disc spring, it is not necessary to provide a component such as a washer for protecting the contact surface, and the number of components is reduced.

  If the substantially central region of the spring part is curved in an arc shape toward the opposite side with respect to the action direction of the spring part, the effective length of the spring part may be increased.

  Further, when the hub is assembled to the inside of the braking rotor, the restricting means covers at least a part of the axial surface of the braking rotor and the hub from both sides in the axial direction and is in surface contact with at least the axial surface of the hub. If a pair of pressing plates configured as described above are provided to prevent the brake rotor from coming off from the hub in the axial direction, a separate connecting means is not required to connect the brake rotor and the hub. Thus, a simple coupling structure between the braking rotor and the hub that can be removed even by a large centrifugal force while effectively using the spring characteristics of the urging means is obtained, and the assembling work can be simplified.

  In this case, one of the pair of pressing plates is composed of a plate-like portion covering a part of the axial surface of the brake rotor and the hub, and at least two columnar portions extending from the plate-like portion in the axial direction. If an opening through which each columnar portion passes is provided in at least one of the other pressing plate, the base of the urging means, and the hub and the braking rotor, the columnar portion is attached to the other pressing plate. The brake rotor and the hub can be connected to each other in a floating state by simply passing through the base portion of the biasing means and at least one of the hub and the brake rotor from the axial direction and caulking the tip. In this case, the urging means is positioned by preventing the movement of the urging means only by passing each columnar portion through the opening, and the urging force of the urging means does not change even if simple press caulking is used. As a result, the assembly work can be further facilitated. At this time, if the caulking portion of the columnar portion is located on the back side of the brake disc, the aesthetic appearance is not impaired.

  By the way, this type of floating disc brake is required to reduce the weight as much as possible while having the necessary strength for reasons such as improving the fuel efficiency of a vehicle equipped with this disc brake. Therefore, a plurality of protruding pieces are formed at predetermined intervals on the inner peripheral edge of the braking rotor, and a recess is formed on the outer peripheral edge of the hub corresponding to each protruding piece. The hub is assembled inside the brake rotor while being inserted, and the restricting means is arranged in a region where each protruding piece is inserted into each recess, and the portion of the outer peripheral edge of the hub that abuts the protruding piece It is preferable to provide a beam portion that connects each of the protrusions in a straight line, and to place the protruding piece on the center line along the longitudinal direction of the beam portion when the protruding pieces are inserted into the concave portions.

  According to this, when braking by braking operation, when the braking rotor rotating at a predetermined rotational speed is sandwiched between the brake pads, by the force to stop the braking rotor and the force to rotate the hub, A load is applied to the hub via each connecting portion connected by the connecting means. In this case, the point where the load to the hub is input occurs at the point where the projecting piece of the braking rotor and the concave part of the hub are in contact, and the linear beam part is located on both sides of this point. It is possible to receive the input load to the hub by dividing the load. Thereby, even when the cross-sectional area (thickness of the beam) in the load input direction of the beam portion is small, the strength of the hub can be increased, so that the hub volume can be reduced and the weight can be reduced.

  If the center of the beam is positioned outside the midpoint of the radial line connecting the inner peripheral edge of the brake rotor and the outer peripheral edge of the central opening formed in the hub, a load in the torsional direction is applied. Even when sufficient strength is obtained.

  Further, if both sides of each protruding piece are curved in an arc shape toward the outer side, when a load is input to the hub via the protruding piece, the side surface of the protruding piece and the inner wall surface of the recess are pivoted. By making line contact in the direction, the stress at this contact portion may be made substantially uniform.

  As described above, the floating disc brake of the present invention has an effect that the amount of action of the urging means is high with a simple structure, is easy to assemble, and can be reduced in weight. .

  Referring to FIGS. 1 to 7, A is a brake disk used in the floating disk brake of the present invention (in FIG. 1, the brake disk A is shown from the front side). The brake disc A is composed of a braking rotor 1 and a hub 2 disposed inside the braking rotor 1, and is mutually in a state where the braking rotor 1 is urged in the axial direction by an urging means 3 described later. Concatenated.

  As shown in FIG. 2, the braking rotor 1 has a rotor portion 11 that is sandwiched between brake pads (not shown) set on a caliper having a known structure and exerts a braking force when a brake is operated. The rotor part 11 is comprised from metal materials which have abrasion resistance, such as stainless steel, and is formed in the cyclic | annular form with the flat plate. A plurality of circular through holes 12 having the same diameter are formed on the axial surface 11a of the rotor portion 11 mainly in order to improve braking performance and reduce weight. Further, five projecting pieces 13 projecting inward in the radial direction are formed at predetermined intervals on the inner peripheral edge portion of the brake rotor 11 so as to match the number of shaft portions of the hub described later. Yes.

  As shown in FIG. 3, the hub 2 is made of a metal material such as stainless steel or aluminum alloy, and is a flat base plate 21 having a central opening 21a that can be attached to an axle (not shown). Five shaft portions 22 having a substantially triangular shape in plan view and extending radially outward from each base portion 21 at a predetermined interval, and between the shaft portions 22 in the vicinity of the tip of the shaft portion 22. And a beam portion 23 connecting the two in a straight line. In this case, the hub 2 starts from a disk work on which the base portion 21 is formed, and punches a substantially inverted triangular through-hole 241 in the axial direction on the same circumference with a linear shape. The outer peripheral edge of the workpiece is punched so that the beam portion 23 is formed.

  A concave portion 221 in the radial direction is formed on the outer peripheral edge portion of each shaft portion 22 so that the protruding piece 13 can be fitted and inserted when the brake rotor 1 is assembled. Two openings 222 through which a columnar portion 42 of the presser plate 4 described later passes are formed on both sides of the recess 221. Further, in order to reduce the weight of the hub 2, each shaft portion 22 is formed with another triangular through-hole 242 extending over the outer peripheral edge portion of the base portion 21. The connecting portion between the shaft portion 22 and the end portion of the beam portion 23 is rounded to prevent stress concentration.

  The beam portion 23 is located at the tip end portion of the protruding piece 13 when the protruding piece 13 is inserted into the concave portion 221 on the center line ML along the longitudinal direction, and the center Mp of the beam portion 23 is set to the rotor. It is formed so as to be located outside the intermediate point Lp of the radial line RL connecting the innermost periphery of the portion 11 and the outer peripheral edge of the central opening 21a (see FIG. 1).

  As shown in FIGS. 4 and 5, the regulating means 4, 5 covers at least the axial surface of the hub 2 so as to cover the region where the protruding piece 13 of the braking rotor 1 is inserted into the recess 221 of the hub 2 from both sides in the axial direction. And a pair of pressing plates 4 and 5 that are in surface contact with each other. One holding plate 4 is composed of a plate-like portion 41 and two cylindrical columnar portions 42 extending in the axial direction from the plate-like portion 41 (FIGS. 4A and 4). (See (b)).

  The other pressing plate 5 arranged on the side opposite to the insertion direction of the columnar portion 42 (the back surface of the brake disc A) is composed of a plate material 51 formed in a substantially convex shape corresponding to the outer shape of the urging means described later. Yes. In addition, two openings 52 through which each columnar portion 42 penetrates are formed in a portion extending in the left-right direction of the plate material 51 corresponding to the outer shape of one pressing plate 4 (FIGS. 5A and 5 (A) and 5 (B). b)).

  As shown in FIG. 6, the urging means 3 is made of, for example, stainless steel and includes a base portion 31 and a spring portion 32. In this case, a flat plate made of stainless steel is used as a starting material, and after processing into a substantially convex shape, two cuts 33 are formed from the upper surface to the lower surface, so that the tongue piece extending upward is used as the spring portion 32. The portion excluding the spring portion 32 is the base portion 31. The spring portion 32 is bent so that the angle α formed by the base portion 31 and the spring portion 32 is an obtuse angle at the boundary surface between the base portion 31 and the spring portion 32. The spring portion 32 is curved in an arc shape toward the opposite side with respect to the axial direction of operation so that the effective length of the spring portion is increased. The base portion 31 is also formed with two openings 34 that are located on both sides near the tip of the spring portion 32 and through which each columnar portion 42 penetrates.

  Then, as shown in FIG. 7, after the hub 2 is assembled inside the brake rotor 1 while the protrusions 13 are fitted into the recesses 221, the biasing means 3 that biases the protrusions 13 in the axial direction. In this state, restriction means 4 and 5 for restricting the braking rotor 1 and the hub 2 in the axial direction are provided together with the urging means 3, and the urging of the braking rotor 1 and the axial direction of the braking rotor 1 from the hub 2 are provided. The brake rotor 1 and the hub 2 are connected to each other while preventing the slippage.

  As a result, the degree of freedom of the amount of action of the spring can be increased as compared with the case where an urging means such as a disc spring is externally fitted to the body portion of the connecting pin, and in addition, the spring portion 32 is located in the base portion 31. Because of the structure, the effective length can be increased in a small space. Further, since the edge portion is not in contact with a disc spring, it is not necessary to provide a component such as a washer for protecting the contact surface, and the number of components is reduced.

  Further, the columnar portion 42 of one pressing plate 4 is penetrated from the axial direction into the other pressing plate 5, the base 31 of the biasing means 3, and the openings 52, 34, and 222 provided in the shaft portion 22 of the hub 2, respectively. Since the braking rotor 1 and the hub 2 can be connected in a floating state simply by caulking the tip, even if the tip of the columnar portion 42 is caulked by simple press caulking or the like, the urging force of the spring portion 32 changes. No, assembly work can be performed easily.

  Further, since there are two caulking locations, the biasing means 3 is positioned while preventing movement in the rotational direction. As a result, it is possible to obtain a simple connection structure with high connection strength between the braking rotor 1 and the hub 2 that does not come off even by a large centrifugal force while effectively using the spring characteristics of the spring portion 32. In addition, if the location which the columnar part 42 crimps is made into the back side of a brake disc, an aesthetics will not be spoiled.

  By the way, in the brake disc A having the above-described configuration, a load acts on the hub 2 through a connection portion, that is, a contact surface between the protruding piece 13 and the concave portion 221 of the shaft portion 22 during braking by a brake operation. Since the linear beam portions 23 are positioned on both sides of the point where the load is input, the beam portion 23 can receive the input load to the hub 2 by dividing the load. For this reason, even when the cross-sectional area (thickness of the beam) in the load input direction to the beam portion 23 is small, the strength of the hub 2 can be increased.

  In addition, since the center Mp of the beam portion 23 is positioned outside the midpoint Lp of the radial line, the beam portion 23 has sufficient strength against the load in the torsion direction, and the strength is increased by providing the beam portion 23. Even if the shaft portion 22 is provided with a through hole 242 having a large opening area, sufficient strength can be obtained and the weight can be reduced. In this case, the cross-sectional area in the load input direction of the beam portion 23 is such that the connecting portion is linear, that is, the load in the axial direction is compared with that in which the beam portion remains in an arc shape in order to connect the shortest distance. On the other hand, a reduction of about 17% is possible with the same strength.

  Further, if both side surfaces 13a of each projecting piece 13 are curved with an arc R toward the outer side, when a load is input to the hub 2, the side surface of the projecting piece 13 and the inner wall surface of the recess 221 are pivoted. The line contact is made in the direction, and the stress at the contact portion may be made substantially uniform.

  In the present embodiment, the hub 2 has the 5-axis specification and the beam portion 23 is described. However, the present invention is not limited to this, and the connecting portion between the brake rotor and the hub is linear. If the beam portion is provided so as to be connected, it is possible to reduce the weight while increasing the strength of the hub.

  Next, assembly of the brake disc A will be described with reference to FIG. First, one pressing plate 4 is installed with its plate-like portion 41 facing down, the hub 2 is placed with its back side facing up, and each opening 222 provided in the hub 2 is inserted into each columnar portion 42. set. Next, the brake rotor 1 is installed on the outer side of the hub 2 with the back side thereof facing up while the protruding pieces 13 are fitted and inserted into the recesses 221 of the shafts 22.

  Next, the biasing means 3 and the pressing plate 5 are sequentially set so that the openings 34 of the biasing means 3 and the openings 52 of the other pressing plate 5 are inserted into the columnar portion 42 protruding upward from the hub 2. . The brake rotor 1 is connected to the hub 2 by caulking the tip of the columnar portion 42 protruding from the pressing plate 5 by press caulking. In this case, the base portion 31 of the biasing means 3 is restricted in the axial direction, but the biasing force of the spring portion 32 acting on the rotor portion 11 does not change.

The front view of the floating type disc brake of this invention. The front view of a braking rotor. The front view of a hub. (A) And (b) is a figure explaining one pressing plate. (A) And (b) is a figure explaining the other pressing plate. (A) And (b) is a figure explaining a biasing means. Sectional drawing along the VII-VII line of FIG. The figure explaining the assembly | attachment of the floating type disk of this invention.

Explanation of symbols

A Floating brake disc 1 Brake rotor 11 Rotor portion 13 Projection piece 2 Hub 22 Shaft portion 221 Recess 23 Beam portion 3 Energizing means 4, 5 Restricting means

Claims (7)

A floating type disc brake comprising a braking rotor and a hub disposed inside the braking rotor, wherein the braking rotor and the hub are coupled in a state where the braking rotor is axially biased by the biasing means, The urging means comprises a base and a plate-like spring portion acting on the braking rotor bent at an obtuse angle with respect to the base, and a restricting means for preventing the urging means from falling off by restricting the base in the axial direction. Floating type disc brake characterized by being provided. 2. The floating disc brake according to claim 1, wherein a substantially central region of the spring portion is curved in an arc shape toward an opposite side with respect to an action direction of the spring portion. When the hub is assembled inside the brake rotor, the restricting means covers a part of the axial surface of the brake rotor and the hub from both sides in the axial direction so as to make at least a surface contact with the axial surface of the hub. 3. The floating disc brake according to claim 1, further comprising a pair of pressing plates configured to prevent the brake rotor from coming off from the hub in the axial direction. One of the pair of pressing plates is composed of a plate-like portion that covers part of the axial surface of the brake rotor and the hub, and at least two columnar portions that extend in the axial direction from the plate-like portion, 4. The floating type disc brake according to claim 3, wherein an opening through which each columnar portion passes is provided in at least one of the other pressing plate, the base portion of the urging means, the hub and the brake rotor. A plurality of projecting pieces are formed at predetermined intervals on the inner peripheral edge of the braking rotor, and a recess is formed on the outer peripheral edge of the hub corresponding to each projecting piece, and each projecting piece is inserted into each recess. A hub is assembled inside the brake rotor, the restricting means is arranged in a region where each protruding piece is inserted into each recess, and the portion of the outer peripheral edge of the hub that is in contact with the protruding piece is straightened. The projection piece is positioned on a center line along the longitudinal direction of the beam portion when a beam portion connected in a shape is provided and each projection piece is inserted into each recess. Item 5. The floating disc brake according to any one of Items 4 to 5. 6. The floating according to claim 5, wherein the center of the beam portion is located outside a midpoint of a radial line connecting an inner peripheral edge portion of the brake rotor and an outer peripheral edge portion of a central opening formed in the hub. Type disc brake. The floating disc brake according to claim 5 or 6, wherein both sides of each protruding piece are curved in an arc shape toward the outside thereof.

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