JP2592231Y2 - Jig for measuring the amount of wear on sprocket teeth - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to measurement of sprocket wear in underbody devices of tracked vehicles, and more particularly to a jig for measuring the amount of wear of sprocket teeth.

[0002]

2. Description of the Related Art Conventionally, as one of tools for measuring the wear amount of sprocket teeth, there is, for example, a wear gauge 21 as shown in FIG. , A tooth profile line a and a wear limit line b. When the wear amount is measured using the wear gage 21, the position of the eye of the measurer is always perpendicular to the sprocket tooth profile through the wear gage 21 in front of the sprocket tooth profile to be measured. In this way, the measurement is performed visually in accordance with the measurement reference position of the sprocket teeth.

[0003]

However, in the above-mentioned method, the wear gauge 2 shown in FIGS. 8 and 9 is used.
The first measurement reference line E should be aligned with the portion A of the tooth 22 to be measured. As shown in FIG. 8, the position B is a correlation line between the R portion and the machined surface. Since the portion C is located at a corner before the portion A, the measurer mistakenly sets the measurement reference line E to the position B.
There is a problem that the measurement may be made in accordance with the part or the part C, and an error occurs in the measurement result. On the other hand, as another example of a method for measuring the amount of wear, as shown in FIG. 10, there is a method of measuring the pitch of three tooth tips of a tooth 22 using a scale 23.
This has a problem that even if the position where the scale 23 is applied is slightly shifted, the read value of the pitch is greatly different, and only the wear near the tooth tip can be measured. In addition, as shown in FIG. 11, a hexagonal gage 24 having a different diagonal is located between adjacent teeth 22 of the sprocket, and two corners of the gage 22 are arranged as shown in FIG. Can be continuously used when is in contact with each tooth 22 (see section P),
When one of the two corners is away from the tooth 22 (see section P) as in (b), it is determined to be unusable, and it cannot be determined how much the present wear amount is. . Further, in any of the above-described measurements, for example, FIG.
Various types of wear such as wear on the forward drive side, wear on the reverse drive side, wear on the tooth tips on the forward drive side, root (tooth root) wear on the sprockets as shown in Fig. 2, and wear on the tooth tips on the reverse drive side The wear pattern cannot be used.

[0004] In view of the above, the present invention takes into account the various wear patterns described above by allowing the measurer to align the measurement reference line of the jig with the measurement reference line of the sprocket to be measured without error.
The purpose of the present invention is to provide a sprocket tooth wear amount measuring jig capable of accurately grasping the wear amount of a tooth in accordance with the measurement of a spring, and to solve the drawbacks of the prior art. It was done.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, according to the present invention, a hole is formed below a measurement reference line of a wear gauge so as to contact the measurement reference line, and a positioning pin jig perpendicular to the hole is formed. Is attached.

[0006]

According to the above construction, the measurement reference line of the sprocket tooth to be measured can be reliably aligned with the measurement reference line of the wear gauge by the positioning pin, and the measurement is facilitated.

[0007]

1 shows a wear gage portion of an embodiment of a jig for measuring a wear amount of a sprocket tooth according to the present invention, wherein (a) is a front view, (b) is a side view, and FIG. FIG. 3A shows an embodiment of a positioning pin jig portion of the sprocket tooth wear amount measuring jig according to the present invention, and FIG.
3 (b) is a rear view, FIG. 3 is a state diagram of the sprocket teeth obtained by combining FIGS. 1 and 2 when measuring the wear amount, and FIGS. 4 to 6 are other embodiments of the positioning pin jig portion of the present invention. 4 is a front view, FIG. 5 is an enlarged side view of FIG. 4, and FIG.
FIG. 5 is a state diagram when the positioning pin jig of FIG. 4 is rotated at a right angle.

The present invention will be described below with reference to the embodiments shown in FIGS. In the present invention, a hole 3 is formed below the measurement reference line 2 of the wear gauge 1 so as to be in contact with the measurement reference line 2.
A vertical positioning pin jig 4 is attached to the hole 3.

FIG. 1 shows a wear gauge 1 in which a tooth profile line a, a wear limit line b, and a measurement reference line 2 of a sprocket before use (not worn) are written on a transparent acrylic plate as in FIG. It is. A scale 5 is provided between the tooth profile line a and the wear limit line b so that the amount of wear can be visually checked, and a hole 3 is formed in the wear gauge 1. FIG. 2 shows a positioning pin jig 4 which is vertically fixed to one longitudinal end of a pin 4a having substantially the same size as the hole 3. FIG.
b.

Next, the operation will be described. To measure the amount of wear of the teeth 6a of the sprocket 6 in use, as shown in FIG. 3, the wear gage 1 is brought into contact with one side of the teeth 6a, and a positioning pin is inserted into the hole 3 from outside. The jig 4 is inserted. As a result, the tip of the pin 4a comes into contact with the measurement reference line A of the sprocket 6 to be measured.
And the wear reference is based on this.
The wear amount of the teeth 6a of the teeth 6a against the teeth 1 can be known through the scale 5 of the transparent wear gauge 1. In the figure, reference numeral 7 denotes the final drive.

FIG. 4 to FIG. 6 show another embodiment of the present invention, in which a wear gauge 1 is common to FIG. In the same manner as in the previous embodiment, a positioning pin jig 8 to be attached to the hole 3 of the wear gage 1 is in contact with the wear gage 1, a positioning pin 10, and a plate for sliding the positioning pin 10. 9 comprises a cylindrical guide 11 fixed to 9 and a wire 12 for preventing the guide 11 and the positioning pin 10 from falling off. The plate 9 is held on the wear gauge 1 by a clip 13. It is like that. Therefore, in order to measure the amount of wear of the sprocket teeth 6a, as shown in FIG. 5, the positioning pin 10 is slid along the hole of the guide 11, and the tip of the pin 10 is brought into contact with the measurement reference line A of the sprocket 6. Since the dimensions of the wear gauge 1 differ depending on the model, the plate 9
When the plate 9 interferes with a cover (not shown), the plate 9 is rotated from 0 ° to 90 ° from the position shown in FIG. FIG. 6 shows 90
° shows a rotated state.

[0012]

As described above, according to the present invention, a hole in contact with the measurement reference line is formed below the measurement reference line of the wear gauge, and a positioning pin jig perpendicular to the hole is attached to the hole. The measurement reference line of the wear gauge can be accurately adjusted to the measurement reference position of the tooth to be measured, and the measurement can be easily performed even if the measurement reference position is located at the back. In addition, the above-mentioned various wear patterns can be measured.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a wear gauge portion of a jig for measuring a wear amount of a sprocket tooth according to the present invention, and (a).
Is a front view and FIG.

FIG. 2 shows an embodiment of a mounting pin jig portion of the sprocket tooth wear amount measuring jig according to the present invention;
(A) is an explanatory view of a side surface, and (b) is an explanatory diagram of a back surface.

FIG. 3 shows a sprocket tee obtained by combining FIGS. 1 and 2;
FIG. 4 is an explanatory diagram showing a state when measuring the wear amount of the steel.

FIG. 4 is an explanatory front view showing another embodiment of a mounting pin jig portion of the sprocket tooth wear amount measuring jig according to the present invention.

FIG. 5 is an explanatory diagram showing an enlarged side view of FIG. 4;

FIG. 6 is an explanatory diagram showing a state where the positioning pin jig of FIG. 4 is rotated at a right angle.

FIG. 7 is an explanatory view showing the front of a conventional wear gauge.

FIG. 8 is an explanatory diagram showing an enlarged detail of an example of a partial cross section of a sprocket tooth to be measured.

FIG. 9 is an explanatory diagram showing enlarged details of another example of a partial cross section of a sprocket tooth to be measured.

FIG. 10 is an explanatory view showing an example in the case of a conventional measure for measuring the amount of wear of a sprocket tooth.

FIG. 11 shows an example of a conventional sprocket tooth wear amount measurement using a hexagonal gauge, in which (a) is an explanatory diagram in a case where continuous use is possible and (b) is an explanatory diagram in a case where continuous use is impossible. .

FIG. 12 is an explanatory diagram showing a pattern of wear of a sprocket.

[Explanation of symbols]

 Reference Signs List 1 wear gauge 2 measurement reference line 3 hole 4 positioning pin jig 8 positioning pin jig

Claims (1)

(57) [Scope of request for utility model registration] 1. A sprocket tooth according to claim 1, wherein a hole in contact with the measurement reference line is formed below the measurement reference line of the wear gauge, and a vertical positioning pin jig is attached to the hole. A jig for measuring wear.