JPH09256865A - Deflection detecting device for annular transmission body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a deflection detecting device in which a tensioning means and a deflection measuring means of a timing belt are individually operated, and the assembling and adjusting works are easy. SOLUTION: A timing belt 7 is pressed against a tension roller 9 which is energized by a spring from the outside, a steel wire 14 is embedded in teeth 13 formed on an inner side surface of the timing belt 7, and a magnetic sensor 12 is fitted with an interval (a). The output of the magnetic sensor 12 is received by an ECM 15, and an alarm lamp 16 indicates the lighting, flashing, etc., according to the magnitude of the input, and the exchanging timing is always monitored when an engine is started.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION There is a mechanism in which the rotation of a drive shaft of an automobile engine is transmitted to a cam shaft by a timing belt or a cam chain to control the operation of a valve. It needs to be replaced each time as it changes and grows. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection detecting device for an annular transmission, which enables easy confirmation of a tension state of a timing belt, a cam chain, etc., and a replacement time.

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS. 14 and 15, an automobile engine 1 includes a cylinder block 2 and drive shafts 3 on both sides.
Is projected, the drive pulley 4 is mounted on one side, and the other side is connected to a mission (not shown). The upper cam pulley 5 is attached to the cam shaft 6, and the timing belt 7 is wound around the drive pulley 4. As shown in FIG. 15, the timing belt 7 is pressed inward from the outside by the tensioning device 8 to adjust the tension. The tension device 8 is a device in which a bracket 10 supporting a tension roller (actuator) 9 is biased by a spring 11 so that the tension roller 9 is brought into pressure contact with the timing belt 7.

The timing belt 7 can be checked at the stage of daily maintenance, vehicle inspection, etc., and as a guide, the mileage is about 100,000 km.
When it comes to the replacement timing, it is uncertain because the wear degree of the timing belt 7 varies depending on various conditions such as the driver, the season, and the mounting method. Therefore, it has been proposed to monitor the timing belt 7. Although not the timing belt 7, as an example, a tension detector is installed inside a normal belt, and the inside of the belt is pressed by a roller at the tip of the rod to convert displacement due to slack into movement of the rod and attach it to the rod. There is one in which a warning light is turned on by interlocking the switch (see Japanese Utility Model Laid-Open No. 61-75546).

Further, in a system in which a tension roller urged by a spring is pressed inward from the outside of the belt, a damper is connected to a bearing bracket of the tension roller to detect displacement of the damper. There is an extension detecting device (see Japanese Patent Laid-Open No. 1-93655).

[0005]

However, the tension detector and the extension detector described above are integrated with the tensioning means and the measuring means, and the stroke for tensioning the belt and the stroke for turning on the switch are interlocked. Because of the change, the setting of the limit points is different for each structure, and it is difficult to adjust the positions of the switches and the like, and the installation work is complicated because the installation location is restricted.

It is an object of the present invention to provide a deflection detecting device for an annular transmission in which the tensioning means and the measuring means are independently operated to facilitate adjustment.

[0007]

In order to achieve the above-mentioned object, the present invention presses an operating portion of a tensioning device against the outer surface of an annular transmission body wound between a plurality of rotating bodies, and displaces the pressing portion. It is characterized in that a gap sensor based on light or magnetism for detecting movement is attached to the movement position of the actuating portion so as to be opposed to the movement portion with an interval, and an alarm device for notifying by the output thereof is connected to the gap sensor.

Specifically, a pulley, a belt and a tension roller constitute a rotating body, an annular transmission body and an operating portion, a metal body is mounted on the inner surface of the belt, and the magnetic sensor is opposed to the belt in the pressure contact direction. It is characterized by installing. In addition, a plurality of teeth are formed on the inner surface of the belt, and a metal body is embedded in the tips of the teeth.

Alternatively, a bar provided with a sprocket, a cam chain and a slipper constitutes a rotating body, an annular transmission body and an operating part, and a slipper connected to one end of a bar which moves in a straight line is press-contacted to the outer surface of the cam chain. And a gap sensor for detecting the displacement of the bar is attached. Also, while placing the cam chain on the wall surface of the cylinder block, attach the cam chain cover,
The bar is projected from the inside, and a gap sensor for detecting the displacement of the protruding portion of the bar is attached to the outside of the cover.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Timing belt (annular transmission)
In addition to the conventionally-known hard rubber timing belt, metal cam chains have also been used for the so-called. The timing belt made of hard rubber and the cam chain made of metal are assumed to be compatible in terms of the structure, but hereinafter, the timing belt is made of hard rubber. A pulley and a sprocket are examples of the rotating body around which the annular transmission body is wound.

First, regarding the structure for tensioning the belt by bringing the tension roller into pressure contact with the outer surface of the timing belt, a plurality of teeth formed on the inner surface of the timing belt are embedded with iron wires (metal bodies), The magnetic sensor is installed facing the iron wire at a position along the direction of pressure contact with the tension roller. If the timing belt rotates, multiple iron wires will cross the front of the magnetic sensor, so the output signal will be corrugated, and the average or maximum value will be monitored by an alarm device to directly know the degree of deflection. be able to. In addition, the tension roller is pivotally supported on a bar that moves in a straight line, so that the protruding plate is fixed to the bar, and the protruding plate is made of metal, so that it is possible to directly monitor the degree of bending by monitoring with a magnetic sensor. it can. In this case, the output signal becomes a direct current, and the interval may be determined by measuring the amount of reflection with an optical sensor such that light is reflected by the projecting plate.

When the cam chain is used, the slipper is pressed to tension the cam chain, and the slipper is attached to the tip of the bar that moves in a straight line, and the outside of the annular cam chain is pressed against it. Therefore, the amount of bending can be known by monitoring the movement of the bar.

[0013]

Embodiments of the present invention will be described below with reference to the accompanying drawings. As shown in FIG. 1, a drive shaft 3 projects and a drive pulley 4 is attached to a lower portion of a cylinder block 2 of an engine. A cam pulley 5 connected to a cam shaft 6 is pivotally supported on the upper portion of the cylinder block 2, and a timing belt 7 is wound between the drive pulley 4 and the cam pulley 5. A bracket 10 supporting the tension roller 9 is biased by a spring 11, and the tension roller 9 presses the timing belt 7 from the outside. In addition, the gap sensor 12 is arranged along the pressure contact direction of the tension roller 9.
Is installed so as to face the inner surface of the timing belt 7.

As shown in FIG. 2, an iron wire (metal body) 14 is embedded in the teeth 13 formed on the inner surface of the timing belt 7, a magnetic sensor is used as the gap sensor 12, and the output of the magnetic sensor is large. Then, the size of the interval a can be obtained. Further, the output of the gap sensor 12 is input to the ECM (electronic control device) 15 via the connector, and the ECM 15
Will be sent to the alarm device constituted by the alarm lamp 16 with the energizing SW turned on. The alarm lamp 16 is provided on the meter panel 18 of the instrument panel 17, as shown in FIG.

The alarm lamp 16 is arranged in blue, yellow and red, which is good,
Attention, I turn it on to mean replacement, but no light (blue),
It may be intermittent lighting (yellow) or continuous lighting (red). As an example of the distinction between them, as shown in FIG. 4, the gap a between the gap sensor 12 and the iron wire 14 is set to 20 mm, and the timing belt 7 is good up to 14 mm.
The area between mm is the caution area, and the area 8 mm or less is the exchange area.

Next, the operation of the deflection detecting device will be described with reference to FIG. First, the ignition switch (IgS
When W) is turned on and the engine is started, the gap sensor (G sensor) 12 detects the iron wire 14 of the timing belt 7 and outputs a corrugated output signal. Confirm that this signal is larger than the set value with ECM15. Alarm lamp if small
Replace the timing belt 7 because the 16 red light turns on and the engine is stopped.

When the engine is started, the warning lamp 16 turns yellow. Since the gap sensor 12 is constantly operating, it continues to send a signal to the ECM 15 while traveling, and in a good state, blue continues to be lit. When the amount of bending increases, the warning lamp 16 turns yellow, and the vehicle runs under the condition (the engine is not increased to 2000 rpm or more). When the condition range is exceeded, red lights up as a warning.

As described above, since the state of the timing belt 7 is displayed on the alarm lamp 16 of the meter panel 18, the amount of bending of the timing belt 7 can be constantly monitored.

Further, in the above structure, since the tension roller 9 presses the outer surface of the timing belt 7, the tension roller 9 bites inward when the timing belt 7 extends, and the timing belt 7 contacts both pulleys 4 and 5. The number of places is increased, the engagement of both pulleys 4 and 5 is stable, and transmission is reliably performed. On the other hand, the gap sensor 12 can be arranged at a set interval a regardless of the position of the tension roller 9, and the iron wire 14 and the gap sensor 12 approach each other as the timing belt 7 extends, so that the output signal is It becomes clearer and the accuracy of notification of replacement becomes higher.

Further, in the engine equipped with the timing belt 7, the oil and the timing belt 7 are separated from each other, so that the surface of the cylinder block 2 is not contaminated with oil, and the gap sensor 12 can be easily attached. Since the gap sensor 12 is disposed on the curved outer side of 7, the installation and adjustment work is easy. In addition, when a magnetic sensor is used, the distance a
Can be detected and the output signal is also detected. When the output signal becomes DC, the timing belt 7 does not rotate, and the red alarm lamp 16 can be blinked to notify.

Next, another embodiment will be described with reference to FIGS. The tensioning means of this deflection detecting device is installed so that a tensioner 19 equipped with a spring 11 moves the bar 20 in a straight line, a tension roller 9 is pivotally supported at the tip of the bar 20, and the bar 20 has a corrugated surface. A detent mechanism is provided by abutting the pin 21 engaging with 20a. As a measuring means,
A bar 22 is provided on the upper surface of the bar 20, and the bar 20 is arranged so as to move in and out of the frame 23 of the tensioner 19.
The gap sensor 12 is attached to the frame 23 so as to face the. The tension roller 9 is pressed against the outer surface of the timing belt 7. With this configuration, since the amount of bending matches the amount of movement of the projecting plate 22, the distance a between the projecting plate 22 and the gap sensor 12 can be set freely, and the projecting plate 22 is made of metal and the bending is detected by the magnetic sensor. be able to.

Further, in the above structure, since the tensioner 19 and the bar 20 are fixed to the outside of the timing belt 7, the assembling work is easy, and since the bar 20 moves straight forward or backward, the initial distance a is set. It is easy and the displacement can be detected easily, so installation and adjustment work becomes easy.

Next, FIG. 9 shows the case where a cam chain is used.
It will be described with reference to FIGS. As shown in FIG. 9, in the cylinder block 2, a cam chain 26 is wound between a drive sprocket 24 and a cam sprocket 25, a tensioner 19 is provided outside the annular cam chain 26, and a frame 23 of the tensioner 19 is provided. The gap sensor 12 is fixed so as to face the rear end of the bar 20 through which the gap sensor 12 is inserted.

As shown in FIGS. 10 to 12, a plate-shaped slipper 27 having an end pivotally supported is connected to the front end of the bar 20, and the slipper 27 contacts the outer surface of the cam chain 26, so that the tensioner 19 is supported. The bar 20 is mounted by a spring 11 housed inside the frame 23 so as to move linearly toward the cam chain 26, and a detent mechanism is provided. As a result, the slipper 27 is pressed against the cam chain 26. Further, a cam chain cover 28 is attached to the cylinder block 2 so as to cover the cam chain 26,
The bar 20 is projected from 28, and the oil seal 29 is installed in the projection hole of the bar 20. In fact, as shown in Figure 11, the rod
Insert 30 from the outside of cam chain cover 28 and screw onto bar 20. Then, the gap sensor 12 is arranged at a distance a from the rear end of the protruding rod 30 (bar 20). As shown in FIG. 13, the output signal of the gap sensor 12 is controlled by the ECM 15 to light the alarm lamp 16 according to the difference between the set value and the interval a.

In this configuration, the gap sensor 12 may be either an optical sensor or a magnetic sensor, and since the output changes depending on the distance of the bar 20, the signal is direct current, and blue, yellow, and red are displayed depending on the magnitude of the signal. You can check the replacement time.

Further, the tensioner 19 is fixed, the cam chain cover 28 is mounted, and then the gap sensor 12 is fixed to the outside of the cam chain 26. Since the linear displacement is detected, the initial distance a is Easy to set up, easy to install and adjust. Further, since one end of the slipper 27 is pivotally supported and the other end is pressed against the cam chain 26 by the bar 20, the close contact is good, and when the cam chain 26 extends, the cam chain 26 curves inward and both sprockets 24, The number of engaging points to the sprocket is increased, the engagement state of both sprockets 24 and 25 is stable, and transmission is reliably performed.

[0027]

Since the present invention is configured as described above, the annular transmission member, that is, the timing belt and the cam chain, is pressed against the annular outer surface of the operating portion of the tensioning device to increase the deflection. Along with this, the position of the operating part moves, the number of engaging parts with the rotating body increases and the transmission efficiency improves, and the gap between the operating part and the gap sensor is determined independently without being affected by the amount of bending. This simplifies installation and adjustment work on the line, and simplifies adjustment of alarm devices. When the outer side surface of the timing belt is pressed against the tension roller, the metal body approaches the magnetic sensor when the deflection becomes large, so that the alarm device can be activated by the change in the output. Further, since the metal body is embedded in the tips of the teeth of the belt, the belt keeps rotating smoothly. When the cam chain is pressed against the slipper, the movement of the bar that presses the slipper is detected by the gap sensor installed at the rear end of the bar with a gap, which simplifies the assembling work and reduces the oil on the line. You will be able to prevent dirt on the ground.

[Brief description of drawings]

FIG. 1 is a front view showing the entire appearance of a timing belt according to an embodiment of the present invention.

FIG. 2 is a perspective view of an inner surface of the timing belt shown in FIG.

FIG. 3 is a schematic diagram illustrating a deflection detection device for the timing belt shown in FIG.

FIG. 4 is a graph showing output accuracy of the deflection detection device shown in FIG.

5 is a schematic diagram showing an output display of the bending detection device shown in FIG. 1. FIG.

FIG. 6 is a flowchart of the deflection detection device shown in FIG.

FIG. 7 is a front view of a deflection detection device for a timing belt according to another embodiment.

8 is a side view of the deflection detecting device shown in FIG.

FIG. 9 is a front view showing the whole of a cam chain according to an embodiment of the present invention.

FIG. 10 is a front view showing the cam chain bending detection device shown in FIG. 9;

11 is an enlarged view of the deflection detection device shown in FIG.

12 is a cross-sectional view of the bending detection device shown in FIG.

FIG. 13 is a schematic diagram illustrating a cam chain bending detection device shown in FIG. 9.

FIG. 14 is a perspective view of an engine having a conventional timing belt.

FIG. 15 is a front view showing the overall appearance of the timing belt shown in FIG.

[Explanation of symbols]

 2 Cylinder block 4,5 Rotating body 7,26 Annular transmission body 8 Tensioner 9 Tension roller 12 Gap sensor 13 Teeth 14 Metal body 16 Alarm lamp 20 Bar 24, 25 Sprocket 27 Slipper 28 Cam chain cover

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[Procedure amendment]

[Submission date] April 23, 1996

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] Fig. 1

[Correction method] Change

[Correction contents]

[Fig. 1]

Claims (5)

[Claims] 1. A gap sensor based on light or magnetism that presses an operating portion of a tension device onto the outer surface of an annular transmission body wound between a plurality of rotating bodies and detects displacement movement of the pressing portion. Is attached to the moving position of the gap sensor so as to be opposed to the gap position, and an alarm device for notifying by the output thereof is connected to the gap sensor. 2. A pulley, a belt and a tension roller constitute a rotating body, an annular transmission body and an operating portion, a metal body is mounted on an inner surface of the belt, and a magnetic sensor is mounted so as to face the pressure contact direction of the belt. Claim 1 characterized by the above.
A bending detection device for an annular transmission body as described above. 3. A plurality of teeth are formed on the inner surface of the belt,
3. The deflection detecting device for an annular transmission body according to claim 2, wherein a metal body is embedded in the tips of the teeth. 4. A bar provided with a sprocket, a cam chain and a slipper constitutes a rotating body, an annular transmission body and an operating part, and a slipper connected to one end of a bar which moves in a straight line is press-contacted to an outer surface of the cam chain. The deflection detecting device for the annular transmission according to claim 1, further comprising a gap sensor for detecting the displacement of the bar. 5. A cam chain is arranged on a wall surface of a cylinder block, a cam chain cover is attached, a bar is projected from the inside, and a gap sensor for detecting a displacement of the protruding portion of the bar is attached outside the cover. The deflection detecting device for an annular transmission according to claim 4, which is characterized in that.