JPS5832024Y2 - Vehicle drum brake back plate - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a back plate for a drum brake for a vehicle in which a back plate main body and a dust shield are each separated.

Conventionally, in this type of back plate, the back plate main body and the dust shield are molded separately, and the two are joined together by spot welding, and then painted and finished to prevent the occurrence of rust.

However, since the back plate body and the dust shield are joined by partial welding, there is a gap between them, and it is impossible to pour paint into this gap due to the viscosity of the paint itself. A gap remains that is not covered.

As a result, dirt, water, salt water, etc. can enter the drum brake through these gaps, causing rust to occur in various internal parts, as well as in these unpainted gaps, leading to a decrease in the strength of the back plate body. There is a risk that the product may be damaged or damaged, leading to a serious accident.

In addition, if the dust shield is fixed to the outside of the back plate body, this dust shield has a large
Since it is formed from a sheet of iron, there are disadvantages such as high production costs and increased weight.

The present invention was developed against the background of the above circumstances.A proper number of engagement holes are provided in the flange portion of the metal back plate body, and a dust shield made of heat-resistant synthetic resin is formed separately from the back plate body. A locking protrusion is formed corresponding to the retaining hole, and a circumferential seal protrusion is formed near the locking protrusion, and the retaining protrusion of the dust shield is engaged with the retaining hole of the back plate main body. The dust shield is fixed to the back plate body, and the seal protrusion is pressed into contact with the flange.The purpose is to easily and reliably fix the dust shield to the back plate body with one touch, significantly improving work efficiency, The plate body can be molded and painted as a single unit, and there is no paint residue on the back plate as in the past, making it possible to completely paint the back plate.The back plate itself does not rust and can be used successfully for a long period of time without worrying about strength loss. Moreover, the dust shield is molded from a heat-resistant synthetic resin, thereby providing a back plate for a drum brake for a vehicle that can be made inexpensive and lightweight.

Embodiments of the present invention will be described below with reference to the drawings.

First, an embodiment of the present invention will be described based on FIGS. 2 and 3.

Reference numeral 1 denotes a back plate main body fixed to the vehicle body, which is formed from a thin steel plate, and has a flange portion 2 integrally formed on its outer edge.

There are four engagement holes 3 on the circumference of the bottom surface 2a of the flange portion 2.
Holes are drilled at equal intervals.

The back plate main body 1 is finished by painting the entire body as a single unit to prevent rust.

Reference numeral 4 denotes a shaft-shaped dust shield fixed to the flange portion 2 of the back plate main body 1, and is molded from heat-resistant synthetic resin.

A locking protrusion 5 that engages with the engagement hole 3 is provided on the bottom surface 4a.
are formed corresponding to each engagement hole 3, and this locking protrusion 5 has a stopper portion 5a projecting outward at the upper part.

On the bottom surface 4a of the dust shield 4, two circumferential seal protrusions 6, 7 are formed on the inner and outer sides of the respective locking protrusions 5 in the vicinity thereof.

The dust shield 4 has a locking protrusion 5 aligned with the engagement hole 3 from below on the back plate body 1 whose entire surface is painted.
The respective locking protrusions 5 are pushed in and secured and fixed.

As a result, the stopper part 5a of the locking protrusion 5 moves into the engagement hole 3.
On the other hand, both seal protrusions 6 and 7 of the dust shield 4 are in pressure contact with the lower surface of the flange portion 2, and the dust shield 4 is tightly attached to the back plate main body 1 at its retaining and fixing portion without any gaps. Fix it.

The brake drum (not shown), which rotates together with the wheels, has its outer peripheral edge connected to the outer edge 2b of the flange portion 2 of the back plate main body 1 and the outer edge 4 of the dust shield 4.
Corresponding to (b), the drum brake device is installed in a manner that prevents dirt, water, mud, etc. from entering the drum brake device.

FIG. 3 shows another embodiment, in which a circumferential seal protrusion 8 surrounding the locking projections 5 is formed in the vicinity of each locking projection 5 formed on the dust shield 4, and the dust shield 4
Dust and the like that enter the dust shield 4 are discharged from the gap between the flange portion 2a of the back plate 1 between the locking protrusions 5 and the bottom surface 4a of the dust shield 4, and are prevented from accumulating inside the dust shield 4.

As mentioned above, the dust shield is made of heat-resistant synthetic resin and is formed separately from the back plate body, and the locking protrusion of this dust shield is engaged and fixed in the engagement hole formed in the flange of the back plate body. Since the seal protrusion is pressed into contact with the flange, the dust shield can be easily and securely fixed to the back plate body with a single touch, significantly improving work efficiency, and the back plate body can be molded as a single unit and painted over the entire surface. Since the back plate itself does not rust, there is no need for breakage or damage due to reduced strength, and it can be used successfully for a long period of time.

Moreover, the dust shield is molded from heat-resistant synthetic resin, significantly reducing manufacturing costs compared to conventional single-piece iron plates.
It also has the advantage of being lightweight.

[Brief explanation of the drawing]

Figures 1 and 2 show an embodiment of the present invention.
2 is a sectional view taken along line II-II of FIG. 1, and FIG. 3 is a partially cutaway front view showing another embodiment of the present invention. 1 is a back plate main body, 2 is a flange thereof, 3 is a retaining hole, 4 is a dust shield, 5 is a locking projection, 6, 7.
8 is a seal protrusion.

Claims (1)

[Scope of utility model registration request] An appropriate number of retaining holes are provided in the flange portion of the metal back plate body, and locking protrusions are formed in a dust shield molded from heat-resistant synthetic resin separately from the back plate body in correspondence with the engaging holes. At the same time, a circular seal protrusion is formed in the vicinity of this locking protrusion, and the locking protrusion of the dust shield is securely fixed to the engagement hole of the back plate main body, and the seal protrusion is pressed into contact with the flange portion. Features a back plate for vehicle drum brakes.