JPH0354992Y2 - - Google Patents

Description

[Detailed explanation of the invention] A. Purpose of the invention (industrial application field) The shim with the probe case of this invention integrated is inserted between the back metal of the pad and the piston or pawl of the caliper in a disc brake. A probe case that supports the probe of the lining wear warning device is integrally formed with a thin metal plate shim, which has the function of supporting the probe.

(Prior art) Disc brakes brake the wheels by bringing the lining of the pad into strong contact with the side of the rotor that rotates with the wheel, and braking this using frictional force.
As braking is repeated, it gradually wears out and becomes thinner, and if it becomes thinner than a certain point, the braking action deteriorates and becomes dangerous. Moreover, the degree of friction cannot be seen from the outside.

Therefore, lining wear warning devices have come into use that issue an electrical symbol to notify the driver when the lining wears out beyond a certain level.

FIG. 5 schematically illustrates a conventional probe attached to a pad in such a lining wear warning device.

In FIG. 5, 1 shows the back metal of the pad, 2 the lining attached to the pad, and 3 the probe of the wear warning device. The probe 3 is connected to the main body (not shown) of the wear alarm device by a conductor 4.
A character-shaped soft metal conductor 5 protrudes from the base 6,
A support rod 7 is inserted between the tip of the conductor 5 and the base 4 to support the tip of the conductor 5, and these are wrapped in a resin body 8, which is fitted and fixed to a metal probe case 9. .

The probe case 9 is fixed to the back metal by inserting the lower part (top and bottom according to the drawing), which has a slightly smaller diameter, into the hole 10 of the back metal and caulking the lower end. At this time, the inner side of the lower end of the conductor 5 protrudes from the lining adhesion surface of the backing metal 1 into the hole 11 of the lining 2 by the allowable wear thickness l of the lining.

The lining 2 wears out due to repeated braking,
When the thickness becomes 1, the conductor 5 is cut by friction with the rotor and no current flows through the conductor 4, so that a signal indicating danger is issued from the main body of the alarm device.

(Problems to be Solved by the Invention) The probe of the conventional alarm device as described above is fitted into an independent probe case 9 and caulked to the back metal 1.
The shim that adjusts the contact between the claw and the back metal is also used separately, so the number of main parts increases, and
Troublesome caulking work was required to attach the probe case 9 to the back metal.

B. Structure of the invention (Means for solving problems) This invention reduces the number of parts by forming the probe case for fixing the probe integrally with the shim, and eliminates the troublesome process of caulking the probe case to the back metal. This solves the above problem by eliminating the need for additional work.

(Function) The probe 3 is fitted into the probe case 14' formed in a cylindrical shape at the end of the shim 12, and is pushed up by the engagement of the notch 13 provided in the probe case 14' with the pin 15 and the spring 16. The vertical position within the probe case 14' is kept constant. The thin metal plate shim 12 is attached to the probe case 1.
Since the probe case 14' is brought into close contact with the back plate 1 by the cap screw 18 near the probe case 4', the vertical movement of the probe case 14' is suppressed, and the lining is worn out and the tip of the probe 3 comes to rub against the side surface of the rotor. At this time, even if a force directed upward in FIG. 2 is applied, the shim 12 will flex and the probe will not float up from the hole in the back metal.

(Example) Figures 1 to 4 show an example of this invention. Fifth
The same reference numerals are used for the same parts as those of the conventional example in the figure, and this will be explained below.

At the end of the shim 12 used over the backing metal 1, a protruding piece 14 with notches 13, 13 as shown in FIG. 3 is formed when cutting it out from the material plate.
By bending and bending this, as shown in FIG.
Formed integrally with

The probe 3, like the conventional one shown in FIG.
A V-shaped conductor protrudes from the base, which is wrapped in a short cylindrical resin body 8 and fitted with a metal tube.
A pin 15, 1 is made to protrude diametrically from the side of this.
5 is set. The pin 15 has a thickness that engages with the notch 13 in the case 14'. Also, a step 10a is formed in the hole 10 of the backing metal 1, and a spring 16 is compressed and inserted between it and the step 3a formed in the probe to push the probe 3 up from the backing metal 1, and the pin 15 is inserted into the notch 1.
It is pressed against the top edge of 3. Further, a screw hole 17 is provided in the backing metal 1 near the hole 10, and a set screw 18 is inserted into the backing metal 1 through a hole provided in the shim to match the screw hole 17.
It is screwed on to prevent the shim 12 from separating from the backing metal near this area.

With this structure, the probe 3 is inserted into the probe case 14' from below while the shim 12 is not yet overlapped with the back metal 1, the pin 15 is engaged with the notch 13, and the conductor 4 is inserted into the case 14'. While moving the probe 8 through the side opening and inserting the probe 8 from above into the hole 10 with the spring 16 interposed, the shim 12 is stacked on the back metal 1, and the set screw 18 is inserted into the screw hole 17.
By screwing the shim 12 onto the back metal 1 and fixing it, the probe can be immovably attached to the pad in the state shown in FIG.

As the lining 2 wears, the resin body 8 and the conductor 5
is shaved off for the rotor, and when the conductor 5 is cut,
The danger signal is issued from the wear warning device in the same way as in the conventional case.

C. Effects of the invention (1) When cutting the shim 12 from the material plate, the probe case 14' is formed by cutting the shim 12 into the shape shown in FIG. 3 and bending it. is formed.

(2) Therefore, unlike the conventional case where a shim and a probe case are made separately, manufacturing becomes easier and parts management becomes easier.

(3) Unlike the conventional probe case 9, the troublesome work of caulking the back metal is no longer necessary.

[Brief explanation of the drawing]

Figures 1 to 4 show examples of the present invention, Figure 1 is a plan view of the end of the pad, Figure 2 is a side view of the end of the pad with the back metal cut off, and Figure 3 is a shim cut from a material plate. FIG. 4 is a perspective view of the end of a shim forming a probe case, and FIG. 5 is a longitudinal sectional view showing a conventional probe mounting structure. 1... Back metal, 2... Lining, 3... Probe, 3a... Step, 4... Conductor, 5... Conductor, 6...
... Base, 7 ... Support rod, 8 ... Resin body, 9 ... Probe case, 10 ... Hole, 10a ... Step, 11
...Hole, 12...Shim, 13...Notch, 14...
...Protruding piece, 14'...Probe case, 15...Pin, 16...Spring, 17...Threaded hole, 18...Setting screw.

Claims (1)

[Scope of utility model registration request] A protruding piece formed at the end of the shim 12 is bent to integrally form a cylindrical probe case 14' perpendicular to the shim, and a pin 15 protruding from the side surface of the probe is engaged with the lower end of the case 14'. A step 10a formed in the hole 10 of the back metal 1 into which the probe 3 is inserted and a step 3a formed in the probe 3.
A shim that is integrally provided with a probe case that includes a compression spring 16 inserted between the probe and the probe case and a retaining screw 18 that is screwed into the back metal 1 near the probe and holds the shim 12 in place.