JP2009257550A - Brake lining wear detection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a brake lining wear detection device with high sensitivity and reliability capable of detecting wear of a brake lining even when partial wear occurs in the brake lining. <P>SOLUTION: This brake lining wear detection device detects that at least one brake lining being pressed against a brake wheel to brake rotation of the brake wheel is worn by a predetermined thickness. The brake lining wear detection device is provided with: an optical cable buried into the brake lining by a predetermined depth from a pressing face of the brake lining being pressed against the brake wheel to be parallel with the pressing face; a light detecting means including a light projecting part for projecting light from an end part on one side of the optical cable and a light receiving part for receiving light from the light projecting part in an end part on the other side; and a wear detecting means for detecting wear of the brake lining by the predetermined thickness based on detection signals of the light detecting means. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a brake lining wear detection device that detects wear of a brake lining that brakes rotation of a brake wheel.

  A conventional brake lining wear detection device has a wear detection probe embedded at an appropriate position of the brake lining. This probe has a middle portion folded back in a substantially U shape, and has a built-in insulated wire formed with a U-shaped folded portion that functions as a detector. The U-shaped folded portion faces the rotor, And both ends of the insulated wire drawn from the rear end of the probe are connected to the warning circuit. The brake lining wears in contact with the rotor in response to the brake operation, and as the remaining amount decreases, the U-shaped folded portion at the tip of the probe wears first. The folded part cuts. As a result, the detection unit is electrically disconnected, so that the disconnection is detected by the warning circuit and a warning is issued (see, for example, Patent Document 1).

Japanese Utility Model Publication No. 6-4440

In conventional brake lining wear detection devices using probes, wear detection by the probe is pinpointed, so if wear of the brake lining occurs in a part where the probe is not attached, such as uneven wear, There is a problem that accurate wear detection cannot be performed.
In addition, there is a problem that, when detecting the wear of the brake lining, the current-carrying portion of the electric wire is in electrical contact with the rotor in order to detect a disconnection state due to contact of the linear conductor with the rotor.

  An object of the present invention is to provide a highly sensitive and reliable brake lining wear detection device that can detect even when uneven wear occurs in the brake lining.

  The brake lining wear detection device according to the present invention is the brake lining wear detection device that detects that at least one brake lining that presses against the brake wheel to brake the rotation of the brake wheel has worn to a predetermined thickness. An optical cable embedded in the brake lining so as to be parallel to the pressing surface at a predetermined depth from the pressing surface of the brake lining pressed against the wheel, and a projection that projects light from one end of the optical cable. Light detecting means including a light receiving part for receiving light from the light projecting part at the light part and the other end part, and detecting that the brake lining is worn to a predetermined thickness based on a detection signal of the light detecting means Wear detecting means.

The effect of the brake lining wear detection device according to the present invention is that an optical cable is embedded at a predetermined depth from a pressing surface before use of the brake lining so as to be parallel to the pressing surface, and is incident from an incident end of the optical cable. By detecting whether or not the light reaches the exit end, it is detected whether or not the wear of the brake lining has reached the wear limit. Therefore, even when the brake lining is worn unevenly, the wear can be reliably detected. That's what it means.
In addition, since an optical cable is used to detect whether or not light reaches, electrical insulation can be obtained.

Embodiment 1 FIG.
FIG. 1 is a perspective view of a brake lining provided with a brake lining wear detection device according to Embodiment 1 of the present invention. FIG. 2 is a cross-sectional view showing an optical cable embedded in the brake lining. FIG. 3 is a diagram for explaining the relationship between the brake lining and the brake wheel.
The brake lining 3 provided with the brake lining wear detecting device according to the first embodiment of the present invention is fixed to the brake shoe 3a with a rivet 4, and the brake wheel connected to a motor (not shown) by moving the brake shoe 3a. 10 is pressed.
The brake lining wear detection device 1 according to Embodiment 1 of the present invention has a predetermined depth from a surface that contacts the brake wheel 10 (hereinafter referred to as “pressing surface”) when the brake lining 3 is pressed against the brake wheel 10. Light is projected from the optical cable 2 embedded at that point, the projector 5 in which the light projection port is connected to the incident end of the optical cable 2, the light receiver 6 in which the light reception port is connected to the output end of the optical cable 2, and the light projector 5. In addition, a control device 7 is provided as wear detecting means for detecting whether or not the brake lining 3 has been worn by a predetermined thickness by receiving light by the light receiver 6.

  Further, the brake lining wear detection device 1 detects wear information generated by the control device 7 that detects that the brake lining 3 has been worn to a predetermined thickness and notifies that the brake lining 3 has been worn to a predetermined thickness. Communication control devices 8 a and 8 b that transmit and receive via the telephone line 9 to the monitoring device 12 of the information center 11 are provided.

The brake wheel 10 has a cylindrical shape. Two brake linings 3 are arranged at positions substantially symmetrical with respect to the axis of the brake wheel 10, and a cross section perpendicular to the axis of the brake wheel 10 is surrounded by two opposing arcs and two sides. It is a quadrilateral and extends in the axial direction of the brake wheel 10 while having a cross section thereof. Of the two arcs, the surface including the arc facing the brake wheel 10 is the pressing surface, and the surface including the other arc is in contact with the brake shoe 3a.
The brake lining 3 is provided with a number of through holes, and the brake shoe 3a is also provided with holes. The through holes and the holes are aligned, and the rivets 4 are driven to fix them.

The optical cable 2 is embedded in the same direction as the axis of the brake wheel 10 of the brake lining 3. Further, the optical cable 2 passes through one brake lining 3 in the axial direction, and then turns back, and then passes through the other brake lining 3 in the axial direction, and then turns back. It passes through the inside in the axial direction, is turned back, and passes through one brake lining 3.
Further, the position of the brake lining 3 through which the optical cable 2 passes is a position where a predetermined depth has entered from the pressing surface before use, and the wear limit is defined as when the brake lining 3 is worn to this position.

In the brake lining wear detection device configured as described above, in a state where the brake lining 3 is not worn to a position where the wear limit is reached, light incident on the optical cable 2 from the projector 5 propagates through the optical cable 2 and receives the light. Reach 6
On the other hand, when the brake lining 3 is worn to a position where the wear limit is reached, the optical cable 2 passing through the brake lining 3 is also worn in accordance with the wear of the brake lining 3, so that the light from the projector 5 is blocked and the light receiver 6 Not reach.
Therefore, it can be seen that the light incident on the optical cable 2 from the projector 5 does not reach the light receiver 6, so that the wear of the brake lining 3 has advanced to the wear limit. In this case, for example, information indicating that the wear of the brake lining 3 has reached the wear limit and needs to be replaced via the communication control device 8a, the telephone line 9 and the communication control device 8b is stopped by the control device 7, for example. The center 11 can be notified.

The brake lining wear detection apparatus 1 according to Embodiment 1 of the present invention embeds an optical cable 2 at a predetermined depth from a pressing surface before use of the brake lining 3 so as to be parallel to the pressing surface, and the optical cable 2 Since it is detected whether or not the wear of the brake lining 3 has reached the wear limit by detecting whether or not the light incident from the incident end reaches the exit end, even when the brake lining 3 is unevenly worn Wear can be reliably detected.
Further, since the optical cable 2 is used for detecting whether or not the light reaches, electrical insulation can be obtained.

  In the first embodiment, the optical cable 2 is embedded so as to reciprocate once in each brake lining 3. However, the optical cable 2 may be embedded so as to reciprocate a plurality of times in each brake lining 3. Thus, the wear state can be detected with higher accuracy.

Embodiment 2. FIG.
4 is a cross-sectional view for explaining a state in which an optical cable is fitted in a groove provided in a brake lining according to Embodiment 2 of the present invention.
In the brake lining wear detection device according to the first embodiment of the present invention, the optical cable 2 is embedded in the depth where the wear limit is set inside the brake lining 3 before use. In the brake lining wear detection device according to No. 2, as shown in FIG. 4, a groove 15 is dug into the brake lining 3 before use so that the bottom becomes the wear limit from the pressing surface side, and the optical cable 2 is dug into the dug out groove 15. Is inserted. Except for this, the brake lining wear detection apparatus according to Embodiment 1 of the present invention is the same as the brake lining wear detection apparatus.
The groove 15 is substantially U-shaped.

  In the brake lining wear detecting device according to the second embodiment of the present invention, the groove 15 is dug from the pressing surface before use of the brake lining 3 to a predetermined depth, and the pressing surface is inserted into the dug groove 15. The optical cable 2 is fitted so as to be parallel to the optical cable 2, and it is detected whether or not the wear of the brake lining 3 has reached the wear limit by detecting whether or not the light incident from the incident end of the optical cable 2 reaches the output end. Since it is detected, it is possible to reliably detect wear even when the brake lining 3 is unevenly worn.

  Further, since the groove 15 is dug in advance in the brake lining 3 and the optical cable 2 can be fitted into the groove 15 later, the assembly of the brake lining wear detecting device is facilitated.

In the brake lining wear detection device according to the second embodiment, the groove 15 is dug in the direction orthogonal to the rotation direction of the brake wheel 10, but the groove 15 is dug in the same direction as the rotation direction of the brake wheel 10. May be included.
Alternatively, the brake lining 3 may include three or more grooves 15 including the vicinity of the edge, and the optical cable 2 may be fitted into the grooves 15.

In a brake device in which a plurality of pairs of brake linings 3 are provided, the wear state can be individually detected by embedding the optical cable 2 in each brake lining 3 independently.
Further, the optical cable 2 may be embedded across a plurality of pairs of brake linings 3.

  In the above description, it has been described that the wear of the brake lining 3 is detected.

1 is a perspective view of a brake lining provided with a brake lining wear detection device according to Embodiment 1 of the present invention. It is sectional drawing which shows a mode that the optical cable was embedded in the brake lining which concerns on Embodiment 1 of this invention. It is a figure for demonstrating the relationship between a brake lining and a brake wheel. It is sectional drawing for demonstrating a mode that the optical cable was engage | inserted in the groove | channel provided in the brake lining which concerns on Embodiment 2 of this invention.

Explanation of symbols

  1 brake lining wear detection device, 2 optical cable, 3 brake lining, 3a brake shoe, 4 rivets, 5 projector, 6 light receiver, 7 control device, 8a, 8b communication control device, 9 telephone line, 10 brake wheel, 11 information center , 12 monitoring device, 15 grooves.

Claims (5)

In a brake lining wear detection device for detecting that at least one brake lining that presses against a brake wheel and brakes rotation of the brake wheel wears a predetermined thickness,
An optical cable embedded in the brake lining to be parallel to the pressing surface at a predetermined depth from the pressing surface of the brake lining pressed against the brake wheel;
A light detecting unit including a light projecting unit that projects light from one end of the optical cable and a light receiving unit that receives light from the light projecting unit at the other end;
Wear detecting means for detecting that the brake lining has worn a predetermined thickness based on a detection signal of the light detecting means;
A brake lining wear detection device comprising:   The brake lining wear detection device according to claim 1, wherein a substantially U-shaped groove having a predetermined depth from the pressing surface is provided in the brake lining, and the optical cable is fitted into the groove.   The brake lining wear detection device according to claim 2, wherein the groove is provided in a direction orthogonal to a rotation direction of the brake wheel.   The brake lining wear detection device according to claim 2, wherein the groove is provided in the same direction as the rotation direction of the brake wheel.   The brake lining wear detection device according to any one of claims 1 to 4, wherein the optical cable is disposed across a plurality of the brake linings.

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