JP2580486Y2 - Contact type wear detection probe - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a probe for detecting wear of a brake lining material in a vehicle such as an automobile.

[0002]

2. Description of the Related Art In a vehicle brake, braking is performed by pressing a lining material such as a shoe lining in a drum brake or a brake pad in a disc brake against a rotor. Therefore, the amount of wear of this lining material is detected,
By issuing a warning before excessive wear occurs, safety can be improved.

As means for detecting when the use of the brake lining material due to wear as described above has reached its limit, a probe provided with a conductor which comes into contact with the rotor when the brake lining material has worn by a predetermined amount is used as the brake lining material or the brake lining material. There is an abrasion detecting device provided near the material, which, when the conductor comes into contact with the rotor, notifies the wear of the brake lining material by lighting a warning light or the like. FIG. 8 is used in such a wear detecting device.
1 shows a usage state of a conventional contact-type abrasion detection probe (hereinafter, simply referred to as a probe) 100.

[0006] The probe 100 detects the end face of a plate-shaped or rod-shaped detection conductor B connected to the control unit A by the detection unit 1.
01, and the detection unit 101 is fixed in the housing 102. The probe 100 of FIG. 8 is fixed to the back metal D of the brake lining material C in a state where the detection unit 101 is immersed in the brake lining material C. When the brake lining material C wears by a predetermined amount, the detection unit 101 comes into contact with the rotor R that rotates integrally with the wheel, and the control unit A is energized.

[0005]

However, as shown in FIG. 8 , the conventional contact-type abrasion detecting probe has an end surface of the detecting conductor having the same area as the cross-sectional area of the plate-like or rod-like detecting conductor. Since the detection unit 101 is in contact with the rotor R as it is, there is a problem that the contact area with the rotor R when the brake lining material C is worn by a predetermined amount is extremely small. For this reason, in the related art, the contact reliability between the detection unit 101 and the rotor R is poor, and there is a risk that reliable wear detection may not be performed.

In order to solve the above problem, it is conceivable to use a detection conductor having a large cross-sectional area.
Such a detection conductor having a large cross-sectional area causes a problem that the cost is increased and the wiring space is increased.

The present invention has been made in view of the above circumstances, and when the remaining amount due to the wear of the brake lining material reaches a predetermined amount, the contact portion provided with a detection conductor whose end comes into contact with the rotor. It is an object of the present invention to provide a contact-type wear detection probe having a detection conductor with high contact reliability with a rotor, which is relatively inexpensive and does not require a large wiring space. .

[0008]

SUMMARY OF THE INVENTION A contact-type wear detecting probe according to the present invention that solves the above-mentioned problems comprises a probe body and a probe body.
The probe body has a detachable probe connector and
The probe body is fixed to the housing and the housing
The detection conductor made of a flat metal strip
One end of the detection conductor is bent, and the detection conductor is bent.
A contact area with the rotor larger than a cross-sectional area in the width direction;
And the other end of the detection conductor is
When the probe connector is attached to the probe body,
Contact part connected to the terminal held by the lobe connector
It is in the point of becoming.

[0009]

According to the contact-type wear detecting probe of the present invention, when the brake lining material reaches a predetermined remaining amount due to wear, the detecting conductor comes into contact with the rotor in an area larger than the cross-sectional area other than the contact end.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A probe for contact-type abrasion detection of a brake lining material (hereinafter simply referred to as a probe) according to an embodiment shown in FIG. 1 includes a probe main body 1 and a probe connector 2. The probe body 1 and the probe connector 2
Are detachable from each other by the probe body 1 constituting a male connector and the probe connector 2 constituting a female connector.

As shown in FIGS. 2 and 3, the probe main body 1 includes a housing 11, a packing material 12, and a detection conductor 13.

The housing 11 is formed of a hard resin into a substantially cylindrical shape whose one end is open. This housing 11
The end wall 11a closing the other end of the housing 1
A substantially cylindrical protruding portion 11b protruding outward is formed. A contact surface 11c is formed around the rising portion of the protruding portion 11b by the outer surface of the end wall 11a. Further, the tip of the protruding portion 11b constitutes a portion 11d immersed in a brake pad P described later.
Further, the projecting portion 11b is provided with a mounting recess 1 as shown in FIGS. 3 and 4 at a position adjacent to the immersion portion 11d.
1e1 is formed. The recess 11e1 has a mounting washer 11e2 (FIG. 6) separate from the housing 11.
(See Reference). As shown in FIG. 3, the upper wall of the housing 11 has a notch 11f for engaging a claw 21Ag of the probe connector 2 described later.
Are drilled. Further, the upper and lower walls of the housing 11, the migration position the cutout end side than the hole 11f i.e. the retracted portion 11 d side (arrow X direction), the engagement for engaging the packing material 12 Holes 11g are respectively formed.

The packing material 12 is formed of a soft material such as rubber, and has a tubular portion 12a open at both ends and a pair of upper and lower ear portions 12b projecting radially outward at one end of the tubular portion 12a. Consists of A plurality of grooves extending in the circumferential direction are formed on the inner peripheral surface and the outer peripheral surface of the cylindrical portion 12a, respectively, so that the inner peripheral surface and the outer peripheral surface of the cylindrical portion 12a are formed by these grooves. It has a waterproof shape in which irregularities are continuous in the axial direction. The pair of ears 12b are fitted into locking holes 11f formed in both side walls of the housing 11, respectively. By this fitting, the packing material 12 is held at a position adjacent to the end wall 11a of the housing 11.

The detection conductor 13 is made of a flat band-shaped metal plate. As shown in FIG. 5, the tip of the detection conductor 13 is bent in a J-shape when viewed from the side, so that the area of the tip 13a of the detection conductor 13 is reduced. Is formed to be larger than the area of the cross section 13b in the width direction . As shown in FIG.
3 is a state in which the distal end face 13a is set at a predetermined position in the immersion portion 11d, and the distal end portion side is embedded in the protruding portion 11a. The rear end side of the detection conductor 13 protrudes into a space in the housing 11. This rear end side constitutes a contact portion 13c with the terminal 22 (see FIG. 1) held by the probe connector 2 .

The probe connector 2 has a housing 21 and terminals 22 as shown in FIG.

The housing 21 is formed of the same hard resin as the housing 11 of the probe main body 1, and includes a housing main body 21A and a locking piece support member 21B.

The housing body 21A has an outer shape that can be inserted into the housing 11 of the probe body 1. The housing main body 21A has a space 21Aa for accommodating the terminal 22 therein. In addition, the tip of the housing body 21A is provided with the packing material 12.
A press-in portion 21Ab having a slightly larger diameter than the inner diameter is formed. A mounting hole 21Ac for mounting the locking piece support member 21B is formed in the upper part of the distal end surface of the press-in portion 21Ab. In addition, an insertion hole 21Ad for inserting the detection conductor 13 of the probe main body 1 is formed in an upper portion of the distal end surface of the press-in portion 21Ab. The rear end face of the housing body 21A is provided with the space 21Aa.
An insertion port 21Ae for inserting the terminal 22 therein is formed therein. Further, on the upper surface of the housing body 21A, an elastic piece 21Af extending rearward from the front end side to the center is provided.
Are formed. A claw 21Ag that protrudes upward is formed at a predetermined position on the upper surface of the elastic piece 21Af. Further, the housing body 21A has the space 21
A locking piece 21Ah that can bend upward by being pressed by the terminal 22 inserted into the space 21Aa in a state where the locking support member 21B is not mounted is formed on Aa. When the pressing by the terminal 22 is released, the locking piece 21Ah elastically returns to the lower normal position.
The locking piece 21Ah fits into a locking recess 22Aj formed in the terminal 22 inserted at a predetermined position by returning to the normal position.

The locking piece supporting member 21B is fixed to the housing main body 21A by inserting the terminal 22 into a predetermined position in the housing main body 21A and then inserting the terminal 22 into the mounting hole 21Ac. This locking piece support member 21B
Is mounted in the mounting hole 21Ac to prevent the locking piece 21Ah of the housing body 21 from moving upward.

The terminal 22 has a detection conductor contact portion 22A and an electric wire connection portion 22B integrally formed of a metal piece.

The conductor contact portion 22A for detection is formed in a cylindrical shape, and as shown in FIG. 1, is formed by cutting and raising the peripheral wall of the conductor contact portion 22A for detection and bending it inside. Contact piece 22Aa is provided. The contact piece 22Aa elastically contacts the contact portion 13c of the detection conductor 13 inserted into the detection conductor contact portion 22A. Also,
A locking recess 22Aj is formed in the detection conductor contact portion 22A at a position corresponding to the locking piece 21Ah of the housing main body 21 when the terminal 22 is inserted into a predetermined position of the housing main body 21. This locking recess 22Aj
Is formed together with a so-called lance 22Ac by punching the outer wall of the detection conductor contact portion 22A inward except for a part thereof.

An electric wire E for connecting a control unit (not shown) of the wear detecting device to the probe connector 2 is connected to the electric wire connecting portion 22B via a waterproof rubber packing 22C. In addition, the electric wire E has a coating portion E2 at the tip.
Is removed to expose the conductor E1 (see FIG. 1). The rubber packing 22C has an inner peripheral surface in close contact with the tip of the covering portion E2 and an outer peripheral surface in close contact with the inner wall surface of the housing body 21A. The end of the electric wire connection portion 22B is crimped to the electric wire E via the rubber packing 22C. The portion of the wire connection portion 22B other than the end is crimped to the conductor E1 exposed at the tip of the wire E.

The probe comprising as described above, first the probe body 1, as shown in FIG. 6, the washer 11e ₂
It is attached to the brake device of the car using. That is,
Wherein the inner periphery of the washer 11e ₂ is fitted into the recess 11e ₁ formed in the protruding portion 11a of the probe body 1, an immersive portion 11d of the housing 11 in a state of being retracted into the brake pad P, back metal of the brake pad P the washer 11e ₂ are fixed by screws or the like to the D. At this time, the tip surface 13a of the detection conductor 13 is set at a position on the brake pad P that is a predetermined distance L from the non-contact surface P1 with the rotor R to the contact surface P2 with the rotor R. The predetermined distance L is set based on the limit value of the remaining wear amount of the brake pad P, and is changed to an appropriate value by adjusting the fixing position of the detection conductor 13 with respect to the housing 11 as is apparent from the above description. It is possible to

The probe connector 2 having the terminal 22 connected to the electric wire E is connected to the probe main body 1 on which the brake device is mounted as described above. This coupling is performed by the elastic piece 21 formed on the housing main body 21A of the probe connector 2.
This can be performed by inserting the housing 21 of the probe connector 2 into the housing 11 of the probe main body 1 while Af is bent downward by an external force. Claw 2 formed on elastic piece 21Af of housing body 21A
When 1Ag reaches the position corresponding to the notch hole 11e of the housing 11, when the external force on the elastic piece 21Af is released, the claw 21Ag engages with the rear end peripheral edge of the notch hole 11e, and the housing 21 is removed from the housing 11. Is prevented from leaving. Further, the housing 21 is
The contact portion 13c of the detection conductor 13 on the side of the probe main body 1
d enters the housing 21 through d. The contact portion 13c that has entered the housing 21 further enters the detection conductor contact portion 22A of the terminal 22. The contact piece 22Aa provided in the detection conductor contact portion 22A elastically contacts the contact portion 13c that has entered the detection conductor contact portion 22A in this manner, so that the detection conductor 13 and the terminal 22 are electrically connected. Connected to.

In the probe shown in FIGS. 1 to 6, the tip surface 13a of the detection conductor 513 comes into contact with the rotor R at the time of braking, because the brake pad P is worn by a predetermined amount. Therefore, by connecting one pole of the wear detecting terminal of the wear detecting device to the rotor R and connecting the other pole to the terminal (not shown) of the probe connector 2 , the remaining amount due to the wear of the brake pad P is obtained. Is approaching the limit value. The tip of the detection conductor 13 is bent into a J-shape, and the area of the tip 13a of the detection conductor 13 is set to the cross-sectional area 13b of the detection conductor 13.
As a result, the contact area between the detection conductor 13 and the rotor R is larger than in the conventional case where the tip of the detection conductor 13 is not bent. Therefore, according to the probe having the above configuration, the contact reliability between the detection conductor 13 and the rotor R, that is, the reliability of the wear detection of the brake pad P can be increased as compared with the conventional probe. At this time, the detection conductor 13 is flat.
By bending the tip of a strip-like metal plate into a J-shape
Configuration, making it easy to manufacture, and
, The space occupied by the detection conductor 13 is compact.
As well as a sufficient contact area with the rotor R.
When installing with the rake pad P immersed
Occupy less space, and improve braking performance
There is an advantage that there is little influence on it.

In the above probe, after detecting wear, the probe connector 2 is detached from the probe body 1, and the brake pad P
By replacing the damaged probe main body 1 fixed to the back metal D with a new probe main body 1 and then connecting the probe connector 2 to the new probe main body 1 again, the probe can be replaced with a new probe. The operation of removing the probe connector 1 from the probe main body 1 is performed by bending the elastic piece 21Af of the probe connector 1 downward by an external force to release the engagement between the claw 21Ag and the notch hole 11e, and then pulling out the probe connector 2. It can be done easily.

As described above, the probe is connected to the probe body 1
And the probe connector 2,
When the probe is replaced after detecting wear, the entire probe
There is no need to replace the probe, only the probe body 1
Only need to be replaced, reducing the cost of probe replacement
There is also an advantage that can be achieved.

As shown in FIG. 7 , the probe may be mounted on the outside of the brake pad P by fixing the washer 11e2 to the back metal D or the like. In the case of FIG. 8 as well, the tip of the detection conductor 13 is set at a position on the brake pad P that is a predetermined distance L from the non-contact surface P1 with the rotor R to the contact surface P2 with the rotor R.

Although the probe of the above embodiment is intended for a brake pad of a disc brake as a brake lining material for detecting wear, the probe of the invention is also applicable to the case of detecting wear of a shoe lining of a drum brake. Can be applied to

[0029]

According to the contact-type wear detecting probe of the invention, the contact area between the detection conductor and the rotor can be increased, so that the remaining amount of the brake lining material due to the wear reaches a predetermined amount. This has the effect of enabling reliable detection , and the detection conductor
By bending one end of a flat band-shaped metal plate,
As a result, it can be easily manufactured, and
The space occupied by the output conductor can be made compact,
In addition, a sufficient contact area with the rotor can be secured
Occupied even when mounted while immersed in
With less space available, the effect on braking performance
There is an advantage that there is little sound. Also, probe the probe
With a probe body and a probe connector.
When replacing the probe after detecting wear,
There is no need to replace the whole, only the probe body
Only need to be performed, and the cost required for probe replacement is low.
There is also an advantage that it can be reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory cross-sectional view of a contact-type wear detecting probe according to the present invention.

FIG. 2 is a rear view of a probe main body of the contact-type wear detecting probe of FIG. 1;

FIG. 3 is a longitudinal sectional view of the probe main body of FIG. 2;

FIG. 4 is a sectional view taken along line IV-IV of the probe main body of FIG. 2;

FIG. 5 is an enlarged perspective view showing a tip of a detection conductor.

FIG. 6 is an explanatory view of a use state of the contact-type wear detecting probe of FIG. 1;

FIG. 7 shows a use state of the contact-type wear detecting probe of FIG .
It is explanatory drawing which shows the modification of.

FIG. 8 is an explanatory view of a conventional contact-type wear detecting probe.
is there.

[Explanation of symbols]

 13,113 Detection conductor 13a, 113a Tip surface P Brake pad R Rotor

Claims (1)

(57) [Scope of request for utility model registration] 1. A contact-type wear detection probe having a detection conductor whose end contacts a rotor when a remaining amount due to wear of a brake lining material reaches a predetermined amount, wherein the probe is a probe body. And removable to the probe body
The probe body is fixed to the housing and the housing.
The detection conductor made of a flat metal strip
One end of the detection conductor is bent, and the detection conductor is bent.
A contact area with the rotor larger than a cross-sectional area in the width direction;
And the other end of the detection conductor is
When the probe connector is attached to the probe body,
Contact part connected to the terminal held by the lobe connector
A probe for a contact-type wear detecting device, wherein the probe is formed.