JPH0313681Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention provides a clearance gauge for drum brakes that measures the gap between a shew web of a shew assembly and a parking brake lever rotatably attached to the shew web by a lever pin. It is related to.

Prior Art In a drum brake, when the parking brake lever is attached to the shoe web of the shoe assembly by a lever pin, the stepped portion 12 of the lever pin 10 is attached as shown in FIG.
Normally, the parking brake lever 16 and the shew web 18 are mounted in an overlapping manner between the retaining ring 14 and the parking brake lever 14. For the purpose of smooth operation, it is specified that the gap 19 between the parking brake lever 16 and the shew web 18 is, for example, about 0.35 mm or less. Therefore, when assembling them, after once assembling them, measure the dimension C of the gap 19, and as shown in FIG. It is interposed between the retaining ring 14 and the dimension C of the gap 19 is adjusted to be within the standard.

However, conventionally, when measuring the dimension C of the gap 19 between the parking brake lever 16 and the shew web 18, two plate-shaped clearance gauges 20 of the same thickness are used as a set, and they are measured as shown in FIG. As shown in the figure, by inserting the lever pin 10 in a sandwiched state, it is determined whether the dimension C of the gap 19 is larger than the thickness of the clearance gauges 20, and such a determination operation is performed for multiple sets of different thicknesses. Since the dimension C of the gap 19 is repeatedly measured, the measurement work is troublesome, and this is one of the factors that hinders the efficiency of the work of attaching the parking brake lever 16 to the shew web 18. . That is, since the lever pin 10 is generally loosely fitted into the mounting hole formed in the shew web 18, the parking brake lever 16 and the shew web 18 are in a state where they can tilt relative to each other, albeit slightly. In order to perform accurate measurements while preventing any tilting, it was necessary to use two feeler gauges 22 of the same thickness. Then, using a plurality of pairs of two-piece feeler gauges 22, the dimension C of the gap 19 is determined.
When trying to measure the amount of time required, it was inevitable that the replacement operation would take a considerable amount of time.

Purpose of the invention The present invention was developed against the background of the above, and its purpose is to measure the gap between the parking brake lever and the show web using a single plate-shaped clearance gauge. To provide a feeler gauge for a drum brake which can reliably judge whether the dimension is larger than the thickness of the feeler gauge and makes the measurement work easier than before.

Structure of the invention In order to achieve this object, in the feeler gauge for drum brakes of the present invention, the lever pin is sufficiently fitted into the edge of the plate material that is the feeler gauge, with a width dimension larger than the diameter of the lever pin. In this way, a concave notch is formed.

Effects of the invention In order to judge whether the dimension of the gap between the parking brake lever and the show web is larger than the thickness of the feeler gauge using such a feeler gauge, a lever pin is housed in the concave notch. Do it like this. In this case, if the feeler gauge is too thick, the lever pin will not be accommodated in the concave notch, and conversely, if the lever pin is accommodated in the concave notch, even if the parking brake lever and the show web are inclined to each other. Even in this situation, the size of the gap between them can be considered to be larger than that of the feeler gauge. In other words, according to the feeler gauge of the present invention, it is possible to accurately measure the dimension of the gap between the parking brake lever and the show web by simply replacing one feeler gauge in turn, making it possible to accurately measure the gap between the parking brake lever and the show web. The insertion and replacement operations do not require as much time as before, and such operations can be easily performed with one hand.

Embodiment Hereinafter, an embodiment of the present invention will be described based on the drawings. Incidentally, since the gap to be measured is the same in this embodiment as in the conventional one, the explanation will be given below with reference to FIGS. 1 and 2.

In FIG. 3, 24 is the feeler gauge of this embodiment. This feeler gauge 24 is made of a longitudinally rectangular plate like the conventional feeler gauge, but its width is made larger than the diameter of the lever pin 10, and the edge in the longitudinal direction has a The difference is that a recessed notch 26 is formed in which the lever pin 10 can be sufficiently accommodated.
That is, the depth dimension of the notch 26, in other words, the dimension of the notch 26 in the longitudinal direction of the gauge 24 is
The diameter of the lever pin 10 is sufficiently larger than the radius of the lever pin 10, and is approximately equal to the diameter of the lever pin 10. In addition, the notch 2
A connecting hole 28 is formed on the side opposite to the side where the gauge 6 is formed, and in the connecting hole 28, as shown in FIG. and gold ring 30 in descending order of thickness.
are connected with.

To measure the dimension C of the gap 19 in FIG. 1 using such a feeler gauge 24, the gap 19 is
A feeler gauge 24 is inserted into the notch 26, and the lever pin 10 is accommodated in the notch 26, as shown in FIG. In this case, if the dimension C of the gap 19 is thicker than the thickness of the feeler gauge 24 inserted therein, the feeler gauge 24 will fit the lever pin 10 in the notch 26, as shown by the two-dot chain line in FIG. cannot be completely contained. Conversely, the thickness of the feeler gauge 24 is the dimension C of the gap 19.
If it is thinner than this, the lever pin 10 can be completely accommodated within the notch 26, as shown by the solid line in FIG. In other words, if the feeler gauge 24 of this embodiment is used, regardless of the inclination of the lever pin 10 due to loose fitting, just by inserting one feeler gauge 24 into the gap 19, its dimension C.
It is possible to accurately judge whether the thickness is thicker or thinner than the thickness of the feeler gauge 24 inserted therein. Therefore, by appropriately inserting the feeler gauges 24 of different thicknesses as shown in FIG. Compared to measuring dimension C using a set of two feeler gauges of the same thickness, the time required to select and replace the feeler gauge can be reduced.

The thickness of the feeler gauge 24 is in the range of 0.10 to 0.45 mm, depending on the number of types of spacers 22 prepared to be interposed between the retaining ring 14 and the shew web 18. It is sufficient to prepare one for each thickness of 0.05mm.

Although one embodiment of the present invention has been described above, this is literally an illustration, and the present invention should not be interpreted as being limited to this embodiment.

For example, in the embodiment, the feeler gauge 24
The planar shape of the was supposed to be a long rectangular shape, but it does not necessarily have to be a long rectangular shape.
It may be curved in the shape of a letter.

Further, in the embodiment described above, a plurality of feeler gauges 24 having different thicknesses were bundled together by the metal ring 30, but they do not necessarily have to be bundled in this way.

Although not listed in detail, it goes without saying that the present invention can be implemented with various modifications and improvements based on the knowledge of those skilled in the art without departing from the spirit thereof. be.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view for explaining the object to be measured by the drum brake clearance gauge according to the present invention. FIG. 2 is a perspective view showing the object to be measured in FIG. 1 being measured with a conventional feeler gauge. Figure 3 shows the first
FIG. 4 is an explanatory diagram for explaining the state in which the gap shown in the figure is being measured, and FIG. 4 shows a state in which a plurality of gap gauges having the same shape and different thickness as the embodiment shown in FIG. 3 are bundled. FIG. 10: Lever pin, 16: Parking brake lever, 18: Shoe web (of shoe assembly), 19: Gap, 24: Feeler gauge, 2
6: Notch (concave notch).

Claims (1)

[Scope of Claim for Utility Model Registration] A plate material of a predetermined thickness, which is inserted between a shew web of a shew assembly and a parking brake lever rotatably attached to the shew web by a lever pin, In the drum brake clearance gauge for measuring the gap between the brake lever and the parking brake lever, a concave notch having a width larger than the diameter of the lever pin and capable of fully fitting the lever pin is formed at the edge of the plate material. A feeler gauge for drum brakes that is characterized by: