JPS6050232A - Abnormal belt detecting device - Google Patents

Abstract

PURPOSE:To detect aging of a belt located in a belt cover without removing said cover by providing a member havin the material quality same as that of a timing belt or similar thereto. CONSTITUTION:A timing belt 1 is wound around a crank shaft sprocket 2 and a cam shaft sprocket 4, and housed in a belt cover 10. A retainer 11 is formed in the belt cover 10, and a detector 12 is removably mounted thereon. The detector 12 is composed of thermally aging member 13 mounted on a body 14, the material quality of said thermally aging member 13 being the same rubber as that of the timing belt 1 or a similar one thereto. Hereby, it is possible to check the aging of the timing belt at any time, preventing an engine from being damaged.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for detecting an abnormality in a rubber belt of an automobile internal combustion engine, particularly a timing belt.

[Prior Art] As a conventional timing bell 1 to abnormality detection device, there is one shown in FIG. 1, for example. (Jitsukai 55-18
(See Publication No. 1056).

To explain this now, the timing belt 1 is wound around the crankshaft sprocket 2, the injection pump sprocket 3, and the shaft sprocket 4 so that the teeth mesh with each other, and the timing belt 1 is wound around the crankshaft sprocket 2, the injection pump sprocket 3, and the shaft sprocket 4 so that the teeth mesh with each other, and the timing belt 1 is wound around the crankshaft sprocket 2, the injection pump sprocket 3, and the shaft sprocket 4 so that the teeth mesh with each other. This drives the injection pump and camshaft, and the initial tension is provided by the built-in spring of the tensioner 5.

If timing belt 1 stretches and becomes loose,
The belt switch 6 operates depending on the swing width of the belt,
It detects this and lights up a warning light to warn the driver.

However, in this conventional timing belt abnormality detection device, the belt stretches and the belt swing range is limited to J,
If the belt gets too big, the belt hits the belt switch and lights up a warning light, so if the belt doesn't stretch and only the material deteriorates, this cannot be detected and therefore no alarm will be issued. If the belt continues to operate as it is, there is a problem in that the belt may become chipped or cut, resulting in damage to the internal combustion engine.

To further explain this, the above-mentioned problems such as tooth chipping or cutting of the timing belt are due to progression of cracks in the rubber of the timing belt due to heat aging. However, in order to check for cracks, since the belt profile does not change, it is impossible to detect them using conventional belt tension detection devices, as mentioned above. Do not remove the belt cover one by one (
) had to be done. This work, including the removal and installation of parts around the Bell I cover, was extremely time-consuming and time-consuming. J-How far did you run? 11 no! , :
Whether or not cracks will occur in the rubber of the rubber belt 1- cannot be predicted based only on the distance traveled, since it varies greatly depending on the intention of the running track A'1, that is, the intention of driving t1.

Now, if we think about thermal aging of the timing belt, this is a chemical reaction that occurs when the rubber hardens and cracks appear in the manufactured parts. It can be said that the longer a piece is exposed to a humid atmosphere, the more likely it is to crack.

The timing belt is an important part that drives the cam shirt, etc., and since it is made of rubber, in order to protect it from damage due to water, dust, etc.
Hey, it needs to be sealed, but on the other hand, because it has a cover, this belt is affected by the heat of the internal combustion engine and records temperature 1, and the high or low of the ambient temperature depends on the driving conditions of the car. Therefore, at some point, the timing belt ages and cracks appear.
It is not known whether the belt is progressing to chipping or cutting, and it is necessary to constantly detect and prevent this aging phenomenon, which is a necessary condition for making the belt cover operable without removing it.

[Object of the Invention] An object of the present invention is to make it possible to know the aging of the bell 1- inside the belt cover without removing the bell 1-cover.

[Structure of the Invention] =3- This invention provides a bell 1-anomaly detection neck device for detecting an abnormality of the bell 1- used in the bell 1-cover C, which is made of a member made of a similar material to the bell 1-. are installed in the bell 1 to the cover G-1, and deterioration of the belt is detected by detecting the aging of the eye area +A.

[Function] Since the detection surface of the roughened member inside the belt cover is designed to generate tensile stress in advance, Ft i:J, if the belt ages, similarly, the eye +g;b ages, This will cause cracks on the detection surface. Therefore, from time to time, remove the four tabs of this member from the bell 1~cover and look at it, or receive an automatic alarm when the conductive wire is disconnected due to a crack in the member. Aging can be easily detected. At this time, there is no need to remove the belt cover at all.

[Example] FIG. 2 is a diagram showing an embodiment of the present invention.

First, to explain the structure, the timing belt 1 is wound around the crankshaft sprocket 2 and the cam shirts 1 to 4, and the belt 1 to cover the sprocket 1.
It is within the atmosphere of the cover 10. A hole is formed in the upper part of the belt cover 10 to form a holding part 11, and a detection device 12 is detachably attached thereto.

Detection device 12G: tX As shown in FIG. 3, it is a test piece, that is, a heat aging member 13 attached to a body 14, and further has a stopper 15 and a knob 16. The heat aging member 13 is attached to the convex portion of the body 14 by adhesive or the like, and is bent so that the detection surface 17 roughened in the bell 1 cover generates tensile stress, so that when a crack occurs, the crack occurs. This facilitates the growth of cracks and makes it easier to discover cracks.

The material of the heat aging member 13 is a material that has a correlation with the aging of the timing belt, and is preferably the same rubber as the timing bell 1- or a similar rubber material, but the material is specifically determined through experiments.

Next, the operation of this embodiment will be explained. When necessary, the detection device 12 is removed from the holding part 11 and the surface of the heat-aged member 13 is observed. If there is a crack 18 as shown in FIG. 4, it means that the timing bell 1~ has also aged.

That is, since the heat aging member 13 is exposed to the high temperature atmosphere in which the timing bell 1-1 is moving within the belt cover 10, it is named in accordance with the aging of the timing bells 1-1. A certain heat-aged part (A13) is arranged so that its surface 17 has a tensile stress of <1 yo ("l +
-J Due to the presence of U, it ages under the same conditions as the timing belt. As a result, if the molecular chain breaks, that is, cracks occur, the timing belt will also crack.
This means that there are 11 lines of aging.

Therefore, without removing the cover to the bell 1; by removing and looking at the b1 detection device, the degree of aging of the timing bell 1- can be determined, and it can be replaced at an appropriate time. In this way, inspections can be performed at any time on a daily basis, preventing engine damage accidents.
: This effectively prevents premature belt replacement, saving money and wasting resources.

A second embodiment is shown in FIGS. 5 to 8.

In this embodiment, a detection device 12 is installed (-) in the holding part 11 of the bell/cover 10, and a conductor 19 is installed when the heat aging member 13 is inserted into the main body 1/l of the device. Under normal conditions, one conductor is wired to the coil of the battery 20, ignition switch 21, and fixed electromagnet 22 to form a closed circuit, as shown in Figures 6 and 7. , the electromagnet 22 attracts the terminal of the relay switch 23 against the pressing force of the spring 24, opens the circuit of the alarm lamp 27 connected to the ignition switch 25 and the battery 26, and does not turn on the alarm lamp.

As shown in FIG. 8, when a crack 18 occurs in the heat-aged member 13, the conductor 19 stretches and breaks at that part.
'The coil of the Ti magnet 22 is de-energized and the relay switch 23 is closed by the force of the spring 24.

Therefore, the alarm lamp 27 lights up and issues an alarm.

9 to 11 show a third embodiment.

In this embodiment, a conductive metal thin film 28 is deposited on the surface 17 of the heat-aged member 13, so that this member 13 is attached to the main body 14.
Metal washer i? 29 to the poles 1 to 30, and attach the convex curved surface to J'Jζ.

Usually, as shown in Figure 9.
Is it 1? Continuation 1) Since the lamp is not turned on, cracks '18 appear in the thermally aged member 13, and the conductor 281) is cut. The X indicator lights up.

At this time, cracks will form in the heat-transformed parts in a mesh pattern and may not be completely cut off, but the cracks will increase and the resistance of the prefectural power plant will increase. When the value of culm LαJ becomes slender, the current flowing through the electromagnetic coil decreases (C1).This decrease in current causes the relay to operate, so that there is no problem in detecting aging. In addition, an electronic circuit is installed, which allows the resistance of the conductor to be set at 11C.
4T, which is more personable than 1, alerts J, and configures the sea urchin-C
MoJ: Yes.

As explained above and described above, in this invention, the structure of the belt stability detection device can be used to determine the correlation between the aging and the aging of the rubber sheath of C1 belt 1-. Equipped with the formed death piece, and without leaving any tensile stress on the surface of the death piece, attach the test piece to the atmosphere inside the cover () 8- Detect the aging of the death piece. Since the aging of the belt is detected by this method, the degree of aging of the rubber of bells 1 to 1 (A) can be accurately detected, and the belts can be replaced in a timely manner, thereby preventing damage to the internal combustion engine due to belt breakage. .

Further, since the progress of aging of the bell 1 can be checked even when the belt cover is removed, the effort of inspection can be greatly reduced.

[Effects of the invention] (1) It is impossible to detect thermal aging of the timing bell 1 without removing the swimming bell 1 cover.
) Damage to the internal combustion engine can be prevented in advance.

(1) The cost burden for early replacement of timing bells 1 to 1 can be significantly reduced.

(4) The effort and cost of removing the timing cover for each periodic inspection can be eliminated.

A3, this invention is applicable not only to the timing bell I.
The present invention can also be applied to belt caps for fanoris, which are susceptible to heat aging, for example.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a conventional device, Fig. 2 is a sectional view of a first embodiment of the present invention, Fig. 3 is a detailed view of the detection device of the first embodiment, and Fig. 4 is a detection device of Fig. 3. Fig. 5 is a sectional view of the second embodiment, Fig. 6 is a back view of the detection PI of the second embodiment, and Fig. 7 (, 1, also a tiQ diagram) shows the generation of thermal aging clutter in fr. FIG. 8 is a diagram showing the energized state under normal conditions, FIG. 8 is a diagram showing the A) state when heat aging cracks occur, and FIG. 9 is a side view of the detection device of the third embodiment, including a partial cross section. , FIG. 10 is a back view, and FIG. 11 is a side view, not showing the off state when cracks occur due to heat aging. Explanation of the symbols shown in the drawings 1... Timing belt 10... Belt cover 11... Maintenance 121 part 72.
... Detection device 13 ... Heat aging part shrine 1 ... Conductor 23 ... Relay switch 27 ... Alarm lamp 2
8...Metal thin film (conductor) Fig. 1 11- Fig. 5 Fig. 9 Fig. 10

Claims (1)

[Claims] In a belt abnormality detection device for detecting an abnormality in a bell I used in a bell 1 cover, a bell C1mt is used. - An abnormality detection device characterized in that a member made of the same or similar material is installed in the belt cover, and aging of the belt is detected by detecting aging of the member.