JPH0219638Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a wear warning device that electrically warns of wear of a brake lining.

[Conventional technology]

As this type of wear warning device, for example,
As shown in Publication No.-8950 and Publication No. 56-53160, an indicator in which a lead wire connected to a wear alarm circuit is buried is attached to a back plate to which a lining is fixed, and the lead wire is removed due to wear of the lining. When the wire is disconnected, an alarm circuit is activated and an alarm is issued by a lamp, buzzer, etc.

[Problem that the invention attempts to solve]

However, in both of the above structures, the lead wires are buried inside the indicator made of an insulating material such as synthetic resin, which is cumbersome to manufacture. Since it fits into a mounting hole formed by opening a part of the end, there is a risk of it falling off due to vibration, etc. In the latter case, a disc spring is attached to the indicator and inserted into the mounting hole on the back plate. Since a circlip or the like is fitted to the tip of the indicator protruding from the lining side of the plate to lock it, assembly is time consuming.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a brake lining wear warning device in which an indicator can be easily constructed and its assembly can be easily and securely performed.

[Means for solving problems]

In order to achieve the above object, the present invention is a brake lining wear alarm device that detects the amount of wear on the lining by cutting the lead wire of the wear alarm circuit buried in the brake lining. A lead wire insertion hole is drilled in a direction perpendicular to the axial direction at a predetermined position of the head, and at least two lead wire storage grooves are formed in the shaft portion having a diameter smaller than that of the head, and at the rear end. A retainer locking portion is formed that protrudes in the radial direction of the shaft portion, a lead wire is inserted into the insertion hole and bent into a U-shape to form a loop portion, and the lead wire is aligned along the shaft portion of the probe. The indicator is stored in the storage groove and protrudes from the rear end, and an indicator insertion hole is formed in the back plate portion to which the brake lining is fixed, and the indicator insertion hole is formed on the outer periphery of the indicator. A stopper part that comes into contact with the lining side and the stepped part of the probe head, a body part that covers the shaft part of the probe, a resilient locking pawl that is formed on the body part and engages with the back surface of the back plate part, A retainer having a locking part that protrudes in the axial direction and comes into contact with the retainer locking part is mounted between the probe head and the retainer locking part,
The indicator is inserted into the indicator mounting hole from the lining side, and the back plate is held between the stopper part and the spring locking claw to fix the loop part of the lead wire at a predetermined position on the lining side. There is.

〔Example〕

Hereinafter, an embodiment in which the present invention is applied to a disc brake will be described based on the drawings.

The brake pad 2 performs a braking action by frictionally engaging the brake disc 1 that rotates together with the wheel.
It is composed of a lining 3 that frictionally engages with the disk 1 and a back plate 4 to which the lining 3 is fixed, and an indicator 6 is mounted in an indicator mounting hole 5 formed by penetrating the lining 3 and the back plate 4.

The indicator 6 includes a cylindrical probe 7 made of synthetic resin and a lead wire 8 held by the probe 7.
It is made up of. The head 7a of the probe 7 has a larger diameter than the shaft 7b, and a stepped portion 7f is formed between the two. Storage grooves 7d, 7d for the lead wires 8 are carved in the continuous shaft portion 7b, and a retainer locking portion 7e is formed at the rear end. Lead wire 8
The wire 8a is covered with an insulator 8b, and the probe 7
The shaft portion 7 of the probe 7 is inserted into the insertion hole 7c and bent into a U-shape to form a loop portion 8c.
The connecting portions 8d, 8d are accommodated in the housing grooves 7d, 7d along the direction b, and protrude from the rear end surface of the probe 7, and the connecting portions 8d, 8d are connected to a wear alarm circuit (not shown).

A retainer 9 is mounted around the outer periphery of the indicator 6.

The retainer 9 is a thin plate having spring properties formed into a cylindrical shape, and has a flange-like stopper part 9a that comes into contact with the stepped part 7f of the head 7a of the probe 7 at one end, and a retainer locking part of the probe 7 at the other end. 7e
A locking portion 9b is formed in contact with each of the locking portions 9b, and three resilient locking claws 9c are formed substantially in the center of the stopper portion 9a and rising from the locking portion 9b side as a base point.

When the retainer 9 is mounted around the outer periphery of the indicator 6 configured as described above and inserted into the indicator mounting hole 5 formed in the brake pad 2 from the lining 3 side, the stopper portion 9a of the retainer 9 is inserted into the back plate 4.
At the same time, the resilient locking claws 9c of the retainer 9 abut and engage with the back surface of the back plate 4 to clamp the back plate 4, and the lead wire 8 of the indicator 6
The loop portion 8c is fixed at a predetermined position on the lining 3 side.

As a result, when the lining 3 wears down due to repeated braking operations, the loop portion 8c of the lead wire 8 is cut and the connected alarm circuit is activated.

In the present invention, the indicator is configured as described above, and the indicator is attached to the back plate of the pad, so that the indicator can be manufactured more easily than in the past, and the indicator can be attached more easily and reliably.

[Effect of idea]

As described above, the present invention is used in a brake lining wear alarm device that detects the amount of wear on the lining by cutting the lead wire of the wear alarm circuit buried in the brake lining. A lead wire insertion hole is drilled in a direction perpendicular to the axial direction at a predetermined position of the head, and at least two lead wire storage grooves are formed in the shaft portion having a smaller diameter than the head, and the shaft is inserted into the shaft at the rear end. A retainer locking portion is formed that protrudes in the radial direction of the probe, and a lead wire is inserted into the insertion hole and bent into a U-shape to form a loop portion, and the lead wire is aligned along the shaft portion of the probe. An indicator is configured by being stored in the storage groove and protruding from the rear end, and an indicator insertion hole is formed in the back plate portion to which the brake lining is fixed, and the lining of the back plate portion is formed around the outer periphery of the indicator. a stopper portion that abuts the side and the stepped portion of the probe head; a body portion that covers the shaft portion of the probe;
A retainer having elastic locking claws formed on the body and engaging with the back surface of the back plate, and a locking portion protruding in the axial direction of the probe and abutting the retainer locking portion is connected to the probe head. The indicator is inserted into the indicator mounting hole from the lining side, and the back plate is held between the stopper part and the elastic locking claw, and the lead wire loop part is placed at a predetermined position on the lining side. Since the indicator is fixed to the back panel, manufacturing of the indicator becomes simple, and attachment of the indicator to the back plate becomes easy and reliable.

That is, the lead wire can be inserted into the lead wire insertion hole of the probe, bent into a U-shape, and stored in the storage groove, so that the lead wire can be easily attached to the probe.
An indicator can be easily constructed by attaching a retainer to a probe equipped with this lead wire with a single touch, and the indicator can also be mechanically attached with a single touch by being pushed into an indicator insertion hole in the back plate.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention, in which Fig. 1 is a front view of a brake pad of a disc brake, Fig. 2 is a cross-sectional view from Fig. 1, and Fig. 3 is a cross-sectional view from Fig. 2. FIG. 4 is a perspective view of the probe and retainer. 1... Brake disc, 2... Brake pad, 3... Lining, 4... Back plate, 5... Indicator mounting hole, 6... Indicator, 7... Probe, 7a... Head, 7b... Shaft part , 7c...
Lead wire insertion hole, 8...Lead wire, 8c...Loop part, 9...Retainer, 9a...Stopper part, 9
c...Bullet locking claw.

Claims (1)

[Scope of utility model registration request] In a brake lining wear alarm device that detects the amount of wear on the lining by cutting the lead wire of the wear alarm circuit buried in the brake lining, a probe made of an insulating material such as synthetic resin is placed at a predetermined position on the head of the probe perpendicular to the axial direction. A retainer having a lead wire insertion hole drilled in a direction in which the lead wire is inserted, at least two lead wire storage grooves being formed in a shaft portion having a smaller diameter than the head following the lead wire insertion hole, and protruding in the radial direction of the shaft portion at the rear end. After forming a locking part and inserting a lead wire into the insertion hole and bending it into a U-shape to form a loop part, the lead wire is stored in the storage groove along the shaft part of the probe. An indicator is configured by protruding from the end, and an indicator insertion hole is formed in the back plate portion to which the brake lining is fixed, and an indicator insertion hole is formed on the outer periphery of the indicator on the lining side of the back plate portion and the stepped portion of the probe head. a stopper portion that comes into contact with the
A body portion that covers the shaft portion of the probe, a resilient locking pawl that is formed on the body portion and engages with the back surface of the back plate portion, and a locking portion that protrudes in the axial direction of the probe and abuts the retainer locking portion. a retainer having a ring between the probe head and the retainer locking part, and inserting the indicator into the indicator insertion hole from the lining side,
A brake lining wear warning device characterized in that the back plate portion is held between the stopper portion and the spring locking portion to fix the loop portion of the lead wire at a predetermined position on the lining side.