JP4424261B2 - 2 piece rotor - Google Patents

Description

  The present invention relates to a disc brake that generates a braking force by sliding with a pad or the like, and particularly belongs to the technical field of a two-piece rotor in which a friction ring and a support are separated.

As a two-piece rotor technique, a technique described in Patent Document 1 is disclosed. In this publication, when the friction ring portion is formed of an iron-based material (such as gray cast iron) and the support portion is formed of an aluminum-based material, the friction ring portion and the support portion are slidable in the radial direction. Even when the friction ring portion and the support portion have different thermal expansion amounts, unnecessary force input to the friction ring portion is eliminated and so-called warp-like deformation or the like is suppressed.
JP-T 8-505924

  In the above two-piece rotor, when a strong braking torque is applied, torque is exchanged between the friction ring portion and the support portion via a plurality of pins. Therefore, when an excessive load is applied to the pin, the pin is deformed. There is a risk of inviting. At this time, since the radial gap between the friction ring part and the support part is not so wide, it is difficult to confirm the deformation of the pin from the radial gap.

  The present invention has been made paying attention to the above problems, and an object of the present invention is to provide a two-piece rotor that can easily detect deformation of a pin connecting a friction ring portion and a support portion.

  In order to achieve the above object, in the present invention, an annular member to which a frictional braking force is applied during braking, an attachment member attached to the axle, and a radial direction between the annular member and the attachment member, A two-piece rotor comprising a plurality of pins connecting both members, the first member having a first end attached to the annular member, and a second end attached to the mounting member, the annular member And a connecting member that is broken before the pin by relative movement in the circumferential direction between the mounting member and the mounting member.

  In the present invention, since the connecting member is broken before the pin, the deformation of the pin can be expressed in a specific form of breaking the connecting member.

  Embodiments for realizing the two-piece rotor of the present invention will be described below based on examples.

(Constitution)
FIG. 1 is a front view of a two-piece rotor according to a first embodiment as viewed from the outside of the vehicle. FIG. 2 is an enlarged cross-sectional view in the vicinity of a road wheel provided with the two-piece rotor according to the first embodiment. In addition, as shown in FIG. 2, although applied to the driven wheel in Example 1, it may be applied to the driving wheel and is not particularly limited.

  The two-piece rotor is arranged in the radial direction between the annular member 1 to which a friction braking force is applied during braking, the attachment member 2 attached to the axle side (hub 4 or the like described later), and the annular member 1 and the attachment member 2. And a plurality of pins 3 for connecting both members.

  The annular member 1 is formed of an iron-based material such as gray cast iron, and is disposed between two plate portions 1a and 1b that are arranged in parallel to the rotation axis direction and slides on the brake pad. The arranged ribs 1c are arranged in the circumferential direction. The plate portion 1a is a plate portion outside the vehicle, and the plate portion 1b is a plate portion inside the vehicle.

  A space is formed between the plates other than the rib 1c to ensure heat dissipation. A pressing force (or a pinching force) acts on the plate portions 1a and 1b in the direction of the rotation axis from a brake pad provided on a caliper (not shown), and a frictional braking force is applied to the annular member 1 by the pressing force. For the sake of explanation, the rib 1c and the like are indicated by imaginary lines only in the upper part in FIG. 1, but the parts indicated by these imaginary lines are formed over the entire circumference.

  On the inner periphery of the annular member 1, a plurality of pin insertion holes 1d into which the pins 3 are inserted are equally arranged in the circumferential direction. A clearance is set between the pin 3 and the pin insertion hole 1d in consideration of the coefficient of thermal expansion and the like. Even when the amount of thermal expansion from the mounting member 2 is different when heat is generated by the friction braking force, only the annular member 1 is used. Is freely expandable in the radial direction. Thereby, the deformation | transformation etc. in the annular member 1 are suppressed.

  The mounting member 2 is fastened and fixed between the hub 4 and the load wheel 7 by a hub bolt 5 and a nut 5a with respect to the hub 4 supported by the knuckle 6 shown in FIG. 2 via a bearing. The mounting member 2 is formed by casting integrally with the pin 3 using an aluminum-based material.

  The mounting member 2 includes a disk part 2a having a bolt hole 2e through which the hub bolt 5 passes, a dish part 2b inclined from the disk part 2a toward the inside of the vehicle in the outer diameter direction, and an outer periphery of the dish part 2b. It is located on the inner periphery of the annular member 1 and includes a pin support portion 2c that fixes and supports the pin 3 (supported by casting), and a thin portion 2d that is formed thinner to the inside of the vehicle than the pin support portion 2c. Has been. As is clear from the above configuration, the hub 4, the two-piece rotor, and the load wheel 7 rotate integrally.

  A connecting member 10 is attached between the annular member 1 and the attachment member 2. The connecting member 10 is disposed at a position where the connecting member 10 is visible from a gap such as a spoke of the road wheel 7 when the road wheel 7 is viewed from the outside of the vehicle.

  As shown in the enlarged view of FIG. 3, the connecting member 10 is provided with a first end portion 10 a attached to the annular member 1 and a second end portion 10 b attached to the attachment member 2. Further, the connecting member 10 is provided with a rectangular plate-like portion 10c that is connected to the first end portion 10a and the second end portion 10b at a substantially right angle and is short in the circumferential direction and long in the radial direction. The plate-like portion 10c has a thin plate shape in which the area in the circumferential direction is wider than the area in the rotation axis direction of the annular member 1, in other words, the plate is formed with a small thickness. A notch 11 cut in the circumferential direction is formed between the first end portion 10a and the second end portion 10b at a position deviated from the substantial center to the second end portion 10b.

  A groove-shaped first attachment portion 11a to which the first end portion 10a is attached (press-fitted or the like) is formed near the inner periphery of the plate portion 1a of the annular member 1 and outside the vehicle. A groove-like second attachment portion 21b to which the second end portion 10b is attached (press fitting, welding, riveting, etc.) is provided on the outside of the vehicle, which is the dish portion 2b of the attachment member 2. Therefore, the 1st attachment part 11a and the 2nd attachment part 21b have each fixedly locked the connection member 10 reliably. Moreover, the 1st attachment part 11a and the 2nd attachment part 21b are arrange | positioned along with the radial direction in series.

  The connecting member 10 is made of a material that can be broken with a small force in the circumferential direction compared to the pin 3 and is plate-like, so that the annular member 1 and the mounting member 2 are relatively relative to each other in the radial direction. Even if it moves and vibrates, the vibration can be absorbed.

(Function)
Next, the operation of the first embodiment will be described. When a braking force is generated while the vehicle is running, a friction braking force is applied to the annular member 1 by a caliper (not shown). This friction braking force is transmitted from the pin insertion hole 1 d provided in the annular member 1 to the pin 3, and is transmitted to the pin support portion 2 c provided in the attachment member 2 via the pin 3 and acts on the entire attachment member 2. To do. When a friction braking force acts on the mounting member 2, the braking force acts between a tire (not shown) fitted to the outer periphery of the road wheel 7 and the road surface.

  While the vehicle is traveling, a force for rotating the tire (road wheel 7) acts by the inertia force of the vehicle, so that a large torque acts between the annular member 1 and the road wheel 7. At this time, since the annular member 1 and the attachment member 2 are connected only via the pin 3, a large load is applied to the pin 3, and if this action is repeated, the pin 3 may be deformed.

  At this time, if the pin 3 is slightly deformed, the annular member 1 and the mounting member 2 are relatively moved by this deformation, and accordingly, the first end portion 10a and the second end portion 10b of the connecting member 10 are relatively moved. . As shown in FIG. 4, the relative movement of the connecting member 10 causes stress concentration in the notch 11 and easily breaks before the pin 3.

  That is, as described above, since the pin 3 is slightly deformed and is provided in the radial gap between the annular member 1 and the mounting member 2, the pin 3 is difficult to see and deforms. Whether or not it was difficult to detect. Therefore, even if the deformation amount of the pin 3 is small, the connecting member 10 that breaks before the pin 3 is provided, and the deformation before the pin 3 is broken is detected by visually checking the breaking of the connecting member 10. be able to.

Hereinafter, effects according to the first embodiment will be listed.
(1) The connecting member 10 that is broken before the pin 3 by the circumferential relative movement of the annular member 1 and the mounting member 2 is provided. Therefore, even if the deformation amount of the pin 3 is small, it can be easily detected by visual observation, and the replacement (repair) of the two-piece rotor can be alarmed before the pin 3 breaks.

  (2) The connecting member 10 is a member that is connected outside the annular member 1 and the mounting member 2 on the vehicle side. Thereby, deformation of the pin 3 can be detected visually from the outside of the vehicle.

  (3) The notch 11 is provided in the connecting member 10. Therefore, when the annular member 1 and the attachment member 2 move relative to each other in the circumferential direction, they can be easily broken by stress concentration, and the breakage point of the connecting member 10 can be set.

  (4) The connecting member 10 has a plate shape having a larger area in the circumferential direction than the area of the annular member 1 in the rotation axis direction. Therefore, even if the annular member 1 and the mounting member 2 move relative to each other in the radial direction and vibrate, the coupling member 10 can be prevented from being unnecessarily broken by absorbing the vibration.

  (5) The connecting member 10 is disposed at a position where the annular member 1 can be seen from the outside of the vehicle from the road wheel 7 attached to the outside of the vehicle. Therefore, it is possible to visually detect the deformation of the pin 3 with the road wheel 7 attached.

  Next, Example 2 will be described. Since the basic configuration is the same as that of the first embodiment, only different points will be described.

(Constitution)
FIG. 5 is a front view and a side view showing the connecting member 20 of the second embodiment. As shown in FIG. 5, the connecting member 20 is provided with a first end 20 a attached to the annular member 1 and a second end 20 b attached to the mounting member 2. The connecting member 20 is provided with a rectangular plate-like portion 20c that is connected to the first end portion 20a and the second end portion 20b at a wide angle and is short in the circumferential direction and long in the radial direction.

  The connecting member 20 is made of spring steel, and the plate-like portion 20c is gently curved inward of the vehicle. The connecting member 20 has a notch 11 cut in the circumferential direction at a position biased to the second end 20b rather than the approximate center of the first end 20a and the second end 20b.

  A groove-like first attachment portion 11a to which the first end portion 20a is attached (press-fitted or the like) is formed near the inner periphery of the plate portion 1a of the annular member 1 and outside the vehicle. A groove-like second attachment portion 21b to which the second end portion 20b is attached (press-fitted or the like) is provided on the outside of the vehicle, which is the dish portion 2b of the attachment member 2. Therefore, the 1st attachment part 11a and the 2nd attachment part 21b each fix and latch the connection member 20 reliably. The first attachment portion 11a and the second attachment portion 21b are arranged in series in the radial direction.

  The connecting member 20 is made of a material that can be broken with a small force in the circumferential direction as compared with the pin 3. Further, since the connecting member 20 has a plate shape, the annular member 1 and the mounting member 2 are relatively opposite in the radial direction. Even if it moves and vibrates, the vibration can be absorbed.

  FIG. 6 is a cross-sectional view illustrating the shape when the connecting member 20 of Example 2 is attached to the first attachment portion 11a and the second attachment portion 21d. When attaching the connecting member 20, first, the plate-like portion 20c is compressed from both ends of the first end portion 20a and the second end portion 20b, and in this state, the first attachment portion 11a and the second attachment portion 21d are connected. Install. At this time, as shown in FIG. 6, the plate-like portion 20 c is in a substantially horizontal state, but it may be attached in a curved state, and is not particularly limited.

(Function)
Next, the operation of the second embodiment will be described. Since the action of the relative movement between the annular member 1 and the mounting member 2 is the same as that of the first embodiment, it will be described from the point where the connecting member 20 is broken.

  7 and 8 are sectional views showing a state in which the connecting member 20 is broken. When the pin 3 is deformed and the annular member 1 and the mounting member 2 are relatively moved in the circumferential direction, the connecting member 20 is broken. At this time, since the connecting member 20 is attached to the first attachment portion 11a and the second attachment portion 21d by being compressed, if the connection member 20 breaks at the notch 11, the spring force of the plate-like portion 20c causes the outside of the vehicle. The fracture part protrudes greatly at the tip.

  Thereby, even if it is the inner side of the road wheel 7, a fracture | rupture can be easily detected visually. Further, since the notch 11 is provided at a position deviated from the approximate center of the first end portion 20a and the second end portion 20b to the first end portion 20a, it remains on the second end portion 20b side when it breaks. Since the tip of the fractured portion of the plate-like portion 20c protrudes further to the outside of the vehicle, the visual detection is easier.

Hereinafter, effects according to the second embodiment will be listed.
(6) The connecting member 20 is configured such that at least a part of the connecting member 20 after the breakage protrudes to the vehicle outer side of the annular member 1 or the mounting member 2 than before the breakage. Therefore, the break can be easily detected by visual observation.

  (7) The connecting member 20 is made of spring steel, and is attached to the annular member 1 and the attachment member 2 in a state of being compressed toward the inside of the vehicle. Therefore, at the time of breakage, it is possible to project the vehicle outside by the compressed reaction force, and it is possible to project the vehicle outside using a simple configuration. Further, even if the annular member 1 and the mounting member 2 are relatively moved in the radial direction, vibration can be actively absorbed by the spring force, and unnecessary breakage can be avoided.

  (8) The notch 11 of the connecting member 20 is biased to either one from the approximate center of the first end 20a and the second end 20b. Therefore, the front end of the longer plate-like portion 20c can be protruded to the outside of the vehicle after the breakage, and the breakage by visual observation can be easily detected.

(Constitution)
FIG. 9 is a plan view, a side view, and a front view showing the connecting member 30 of the third embodiment. As shown in FIG. 9, the connecting member 30 is provided with a first end 30 a attached to the annular member 1 and a second end 30 b attached to the attachment member 2. The connecting member 30 is provided with a rectangular plate-like portion 30c that is connected to the first end portion 30a and the second end portion 30b at a substantially right angle and is short in the circumferential direction and long in the radial direction. The connecting member 30 is formed with a notch 11 cut in the circumferential direction at a position biased to the second end 30b rather than the approximate center of the first end 30a and the second end 30b. In addition, an elastic member 30d is provided on the side on which the force acts during the circumferential relative movement of the second end portion 30b.

  A groove-shaped first attachment portion 11a to which the first end portion 30a is attached (press-fitted or the like) is formed near the inner periphery of the plate portion 1a of the annular member 1 and outside the vehicle. A groove-like second attachment portion 21b 'to which the second end portion 20b is attached (press-fitted or the like) is provided on the outside of the vehicle, which is the dish portion 2b of the attachment member 2. The first attachment portion 11a securely fixes and locks the first end portion 30a. On the other hand, the second attachment portion 21b ′ is formed with a groove longer than the circumferential length of the second end portion 30b, and the groove is opposite to the force acting on the second end portion 30b during the relative movement in the circumferential direction. It is a little longer.

  FIG. 10 is a schematic view showing the positions of the elastic member 30d and the second end 30b particularly when the connecting member 20 according to the third embodiment is attached to the first attachment portion 11a and the second attachment portion 21d '. When attaching the connecting member 30, first, the first end 30a is attached to the first attachment portion 11a, and the second end 30b is attached to the second attachment portion 21d ′ in a state where the elastic member 30d is compressed. Install.

(Function)
Next, the operation of the third embodiment will be described. Since the action of the relative movement between the annular member 1 and the mounting member 2 is the same as that of the first embodiment, the description will be made from the point where the connecting member 30 is broken.

  10 and 11 are cross-sectional views showing a state in which the connecting member 30 is broken. When the pin 3 is deformed and the annular member 1 and the mounting member 2 are relatively moved in the circumferential direction, the connecting member 30 is broken. At this time, since the elastic member 30d is compressed and attached to the second attachment portion 21d ′, the connecting member 30 is formed longer due to the spring force of the elastic member 30d when it breaks at the notch 11. Further, it moves greatly in the circumferential direction in the groove of the second attachment portion 21d ′.

  Thereby, since the circumferential relative position of the 1st end part 30a and the 2nd end part 30b shift | deviates greatly, even if it is the inner side of the road wheel 7, a fracture | rupture can be detected easily visually.

  Hereinafter, effects according to the third embodiment will be listed.

  (9) When the connecting member 30 is broken, the first end 30a and the second end 30b are configured to be greatly displaced in the circumferential direction. Therefore, the break can be easily detected visually.

  Although the embodiments have been described above, the present invention is not limited to the above embodiments, and other configurations may be provided. For example, in each of the embodiments described above, a configuration in which one connecting member is provided is shown, but a plurality of connecting members may be provided in the circumferential direction. Thereby, even if it is a case where the position of the spoke of a road wheel is changed, for example, it can be made visible easily. Further, the connecting member may be provided with a color (for example, red or yellow) different from that of peripheral components (annular member, mounting member, road wheel, caliper, etc.) to further improve the visibility. Moreover, you may comprise a connection member with materials with low toughness (for example, carbon steel etc. with a large carbon content). Thereby, it becomes possible to fracture | rupture reliably and visibility can be improved more.

1 is a front view of a two-piece rotor of Example 1. FIG. It is an expanded sectional view of the road wheel vicinity provided with the 2 piece rotor of Example 1. FIG. FIG. 3 is an enlarged view illustrating a connecting member of Example 1. It is an enlarged view showing the state which the connection member of Example 1 fractured | ruptured. FIG. 6 is an enlarged view illustrating a connecting member of Example 2. It is the schematic at the time of attaching the connection member of Example 2. FIG. It is the schematic showing the state which the connection member of Example 2 fractured | ruptured. It is an expanded sectional view showing the state where the connection member of Example 2 fractured. FIG. 6 is an enlarged view illustrating a connecting member of Example 3. It is the schematic showing the state before the fracture | rupture of the connection member of Example 3, and the state after a fracture | rupture. FIG. 10 is an enlarged view illustrating a state after breaking of the connecting member of Example 3.

Explanation of symbols

1 annular member 2 mounting member 3 pin 4 hub 5 hub bolt 6 knuckle 7 road wheel 10, 20, 30 connecting member

Claims (12)

An annular member to which a friction braking force is applied during braking;
A mounting member attached to the axle side;
A plurality of pins arranged in a radial direction between the annular member and the mounting member, and connecting both members;
In a two-piece rotor with
A first end attached to the annular member, and a second end attached to the attachment member; the circumferential movement of the annular member and the attachment member precedes the pin. A two-piece rotor provided with a connecting member that breaks. The two-piece rotor according to claim 1,
The two-piece rotor is characterized in that the connecting member is connected outside the annular member and the mounting member on the vehicle side. The two-piece rotor according to claim 1 or 2,
The two-piece rotor, wherein the connecting member has a notch between an attachment portion with the annular member and an attachment portion with the attachment member. The two-piece rotor according to any one of claims 1 to 3,
The two-piece rotor is characterized in that the connecting member has a plate shape in which the area in the circumferential direction is wider than the area in the rotation axis direction of the annular member. The two-piece rotor according to any one of claims 1 to 4,
A two-piece rotor, wherein a plurality of the connecting members are provided in the circumferential direction of the annular member. The two-piece rotor according to any one of claims 1 to 5,
The two-piece rotor, wherein the connecting member is colored differently from at least one of the annular member and the mounting member. The two-piece rotor according to any one of claims 1 to 6,
The two-piece rotor is characterized in that the connecting member is made of a material having low toughness. The two-piece rotor according to any one of claims 1 to 7,
The two-piece rotor is characterized in that the connecting member is disposed at a position that can be seen from the vehicle outer side from a road wheel attached to the outer side of the annular member. The two-piece rotor according to any one of claims 1 to 8,
The two-piece rotor is characterized in that the connecting member has at least a part of the connecting member after being broken to protrude outside the annular member or the mounting member than before the breaking. The two-piece rotor according to claim 9, wherein
The two-piece rotor is characterized in that the connecting member is made of spring steel and is attached to the annular member and the attachment member in a state of being compressed toward the inside of the vehicle. The two-piece rotor according to claim 10,
The two-piece rotor is characterized in that the connecting member has a fracture position biased to either one of the first center and the second center. An annular member to which a friction braking force is applied during braking;
A mounting member attached to the axle side;
A plurality of pins arranged in a radial direction between the annular member and the mounting member, and connecting both members;
In a two-piece rotor with
Apart from the plurality of pins, a connection member is provided for connection between the annular member and the mounting member,
A two-piece rotor characterized in that the circumferential relative movement between the annular member and the mounting member is visually notified by the breaking of the connecting member.

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