WO2012123983A1 - 動力伝達装置 - Google Patents
動力伝達装置 Download PDFInfo
- Publication number
- WO2012123983A1 WO2012123983A1 PCT/JP2011/001430 JP2011001430W WO2012123983A1 WO 2012123983 A1 WO2012123983 A1 WO 2012123983A1 JP 2011001430 W JP2011001430 W JP 2011001430W WO 2012123983 A1 WO2012123983 A1 WO 2012123983A1
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- WO
- WIPO (PCT)
- Prior art keywords
- belt
- timing belt
- optical sensor
- power transmission
- transmission device
- Prior art date
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Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H7/00—Gearings for conveying rotary motion by endless flexible members
- F16H7/02—Gearings for conveying rotary motion by endless flexible members with belts; with V-belts
- F16H7/023—Gearings for conveying rotary motion by endless flexible members with belts; with V-belts with belts having a toothed contact surface or regularly spaced bosses or hollows for slipless or nearly slipless meshing with complementary profiled contact surface of a pulley
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/02—Gearings; Transmission mechanisms
- G01M13/023—Power-transmitting endless elements, e.g. belts or chains
Definitions
- the present invention relates to a power transmission device that transmits power from a driving pulley to a driven pulley by a belt wound around a driving pulley and a driven pulley, and in particular, the belt is replaced at a time when the belt is detected by detecting deterioration of the belt.
- the present invention relates to a power transmission device that can detect that it has reached.
- crankshaft rotation and camshaft rotation are synchronized.
- the timing belt is damaged due to unforeseen circumstances, the rotation of the crankshaft and the rotation of the camshaft may not be synchronized.
- a power transmission device which has a function of notifying the driver that the timing belt has reached the time for replacement shortly before the timing belt is damaged.
- the fatigue level of an annular transmission such as a timing belt is calculated based on the engine speed and operating time, and the timing belt is replaced when the fatigue level exceeds a reference value.
- a device that issues a warning that it should be known is known (see, for example, Patent Document 1).
- this power transmission device it is more appropriately determined whether or not the timing belt has reached the replacement time than when the replacement timing of the timing belt is determined only by the travel distance of the vehicle.
- the fatigue time of the timing belt is calculated based on the engine speed and the operating time without directly measuring the actual fatigue state of the timing belt, and the replacement time is determined. Since the judgment was made, the calculated fatigue level and the actual fatigue level did not always match, and the accuracy of the replacement time judgment was not high.
- the fatigue level of the timing belt differs depending on whether the load was high and the load was high. For this reason, in consideration of the case where the actual fatigue level becomes larger than the fatigue level of the timing belt calculated based on the engine speed and operating time by this power transmission device, the safety factor is set to be large and a warning is issued. It was necessary to emit.
- the problem that the accuracy of the determination of belt replacement time is not high is not limited to the problem of the timing belt alone. That is, the same problems as described above are assumed in all of the power transmission devices that transmit power from the driving pulley to the driven pulley by the belts wound around the driving pulley and the driven pulley.
- the present invention has been made to solve the above-described conventional problems, and can detect with high accuracy whether or not the belt has reached the replacement time by detecting the state of deterioration of the belt in use.
- An object is to provide a power transmission device.
- a power transmission device is wound around a driving pulley provided on a driving shaft, a driven pulley provided on a driven shaft, the driving pulley, and the driven pulley.
- the belt includes a stress-stimulated luminescent material that emits light upon receiving an external force, and is disposed opposite to the belt and measures the belt photometrically; and Based on the photometric value detected by the optical sensor, it is determined whether or not the belt is deteriorated, and it is determined that the belt has reached the replacement time on condition that the belt is determined to be deteriorated. And a replacement time determination unit.
- the belt since the stress light emitting material is contained in the belt, the belt emits light when an external force is applied to the belt. And when the stress (Pa) and elongation rate (mm / min) which generate
- the light emission amount can be, for example, light amount (lm ⁇ s), luminance (cd ⁇ m ⁇ 2 ), illuminance (lx), luminous intensity (cd), and the like.
- the stress-stimulated luminescent material is a luminescent material in which light emission in the visible light region is excited by a minute external force such as friction, impact, compression, or tension in the elastic deformation region.
- the stress luminescence intensity is proportional to the product of the belt stress and the belt elongation rate.
- the optical sensor detects the light emission of the belt, and based on the photometric value detected by the optical sensor, the replacement time determination unit determines whether or not the belt has deteriorated. Then, on the condition that it is determined that the belt has deteriorated, the replacement time determination unit determines that the belt has reached the replacement time. Therefore, since the deterioration state of the belt is directly detected by measuring the light emitted from the belt, the belt is detected based on the rotational speed of the drive shaft and the operation time without detecting the deterioration state of the belt as in the prior art.
- the belt replacement time can be determined with higher accuracy than when determining the replacement time.
- the replacement time determination unit may deteriorate the belt on condition that the photometric value exceeds a predetermined light emission threshold value or the photometric value changes with a predetermined light emission pattern. And a deterioration-replacement determination unit for determining that the replacement time has been reached.
- the deterioration-replacement determination unit can be attached to the belt on the condition that the photometric value detected by the optical sensor exceeds a predetermined light emission threshold value or the photometric value changes with a predetermined light emission pattern. It is judged that the belt has deteriorated and that the belt has reached the replacement time. For this reason, since it is possible to directly determine whether or not the belt is at the replacement time based on the light emission amount and the light emission pattern of the belt, it is possible to determine whether or not the belt is at the replacement time by a simple process. it can.
- the belt deteriorates due to various reasons, and the light emission amount of the belt increases.
- the belt is easily stretched within the range of elastic deformation due to long-term use of the belt, the belt elongation rate is increased while the belt stress is substantially constant, so that the amount of light emitted by the belt elongation increases.
- the belt is thinned or thinned due to wear or loss of the belt, the stress increases even if almost no elongation occurs, so the light emission amount of the belt increases due to the belt stress increase.
- a toothed belt having a base material such as rubber containing a stress-stimulated luminescent material and a tooth cloth provided on the tooth surface the tooth cloth is worn and thinned, and the light emitted from the base material is Since the tooth cloth is sufficiently transmitted without being attenuated, the amount of light emitted from the belt is increased.
- the belt deteriorates due to various reasons and exhibits a characteristic light emission pattern.
- the tooth root may be elongated or the tooth base may crack due to long-term use. Teeth are likely to chip, and the tooth cloth may crack. If the tooth cloth is cracked, light emitted from the base material leaks from the crack of the tooth cloth at that part, so the photometric value of the belt rises locally and periodically every cycle It becomes.
- the belt is a toothed belt and has a tooth cloth provided on a tooth surface side, and the optical sensor is disposed to face the tooth cloth side of the belt, and the deterioration-replacement determining unit A setting unit that sets an average photometric value based on the photometric value detected by the optical sensor at the beginning of wearing the belt, and sets the light emission threshold by adding a predetermined value to the average photometric value; and the belt
- the light increase determination unit that determines that the belt is deteriorated on the condition that the photometric value of the belt exceeds the light emission threshold value, and the light emission pattern periodically protrudes the photometric value of a specific portion of the belt.
- a replacement determination unit that determines that the belt has reached the replacement time on the condition that at least one of the light increase determination unit and the pattern determination unit determines that the belt has deteriorated. To do.
- the setting unit sets the average luminance from the luminance detected by the optical sensor when the belt is first attached, and sets a light emission threshold by adding a predetermined value to the average luminance.
- the brightening determination unit determines whether the photometric value of the belt when the power transmission device is operating exceeds a light emission threshold value.
- the light increase determination unit determines that the belt has deteriorated on the condition that the light measurement value of the belt has determined that the light emission threshold exceeds the light emission threshold.
- the pattern determination unit determines whether or not the luminance of the specific portion periodically protrudes as the belt has a predetermined light emission pattern.
- the term “periodic protrusion” means that the same part protrudes as a pulse waveform while the belt makes one turn (see FIG. 6).
- the pattern determination unit determines that the luminance of the specific portion of the belt periodically protrudes from the average luminance, the belt is deteriorated by determining that the tooth cloth of the specific portion is cracked. Is determined.
- the replacement determination unit determines that the belt has reached the replacement time on condition that at least one of the brightening determination unit and the pattern determination unit determines that the belt has deteriorated.
- the light emission amount of the belt is small in the new belt.
- the light emission amount of the belt increases as a whole.
- the light emission pattern of the belt protrudes periodically. At this time, deterioration of the belt is determined by the pattern determination unit.
- the belt deterioration can be detected with higher accuracy because the belt deterioration is detected by a different method according to the deterioration mode.
- a tensioner that presses the belt from the back side is provided between the driving pulley and the driven pulley, and the optical sensor is located at a position facing the timing belt immediately after passing through the tensioner. It is characterized by being arranged.
- the light emission amount is detected by the optical sensor immediately after the belt is pressed from the back side. For this reason, since the amount of light emission is detected when the belt stress is large, the detection accuracy of the change in the light emission state of the belt is increased.
- the cover includes a cover that covers the entire belt and shields light, and the cover includes an optical sensor holding unit that holds the optical sensor facing the belt, and a region of an optical path from the belt to the optical sensor. And a light-shielding part provided to surround at least a part of the periphery of the optical sensor holding part.
- the optical sensor held by the optical sensor holding part changes with the change of the cover, so the relative position between the optical sensor and the light shielding part hardly changes.
- the optical sensor is shielded by the light shielding portion. It is possible to suppress a decrease in detection accuracy of the light emission amount of the belt due to intrusion into the inside.
- the drive shaft is a crankshaft of an internal combustion engine
- the driven shaft is a camshaft
- the belt is a timing belt
- This configuration makes it possible to determine with high accuracy whether or not the timing belt of the internal combustion engine is in the replacement period.
- the belt contains the stress luminescent material and the belt replacement time is determined based on the amount of light emitted from the belt, whether or not the belt is in the replacement time by detecting the deterioration state of the belt in use. Therefore, it is possible to provide a power transmission device that can determine whether or not.
- 1 is a schematic front view showing a power transmission device according to an embodiment of the present invention.
- 1 is a schematic perspective view showing a crankshaft, a camshaft, and a power transmission mechanism of an engine of a power transmission device according to an embodiment of the present invention.
- It is a schematic side view which shows the state which cut
- It is the partially cutaway perspective view which shows the timing belt of the power transmission device which concerns on embodiment of this invention.
- It is a flowchart which shows the procedure which judges whether a timing belt is in the replacement time from various degradation of the timing belt of the power transmission device which concerns on embodiment of this invention.
- the power transmission device 1 is mounted on the automobile 2.
- the automobile 2 includes an engine 3 that is an internal combustion engine, an ECU (Electronic Control Unit) 4 as a replacement timing determination unit, and a warning device 5.
- an engine 3 that is an internal combustion engine
- an ECU (Electronic Control Unit) 4 as a replacement timing determination unit
- a warning device 5 As shown in FIG. 1, the automobile 2 includes an engine 3 that is an internal combustion engine, an ECU (Electronic Control Unit) 4 as a replacement timing determination unit, and a warning device 5.
- ECU Electronic Control Unit
- the engine 3 is constituted by a four-cycle gasoline engine that performs a series of four strokes including an intake stroke, a compression stroke, an expansion stroke, and an exhaust stroke while the piston makes two reciprocations. .
- Engine 3 uses an inline 4-cylinder gasoline engine.
- the engine 3 includes an engine body 6, an intake device (not shown) that supplies combustion air to the engine body 6, and an exhaust device (not shown) that discharges exhaust from the engine body 6 to the outside.
- the engine body 6 includes a cylinder block 10, a cylinder head 20 fixed on the upper side of the cylinder block 10, an oil pan 30 fixed on the lower side of the cylinder block 10, a cylinder block 10, a cylinder head 20, and an oil pan 30.
- a power transmission mechanism 40 provided in the vicinity of a front surface 6a (hereinafter simply referred to as an engine block front end surface).
- the cylinder block 10 includes a piston (not shown), a connecting rod (not shown), and a crankshaft 11 as a drive shaft.
- the piston is provided so as to reciprocate in the vertical direction with respect to the cylinder block 10.
- the piston is rotatably connected to the connecting rod.
- the connecting rod is rotatably connected to the crankshaft 11.
- a combustion chamber (not shown) is formed by the cylinder block 10, the cylinder head 20, and the piston.
- the engine 3 reciprocates a piston by burning a mixture of fuel and air in a combustion chamber at a desired timing, and rotates the crankshaft 11 via a connecting rod.
- the cylinder head 20 includes an intake port (not shown) that connects the intake passage of the intake device and the combustion chamber, an intake valve 21 that opens and closes the intake port, a driven shaft that operates the intake valve 21, and an intake camshaft 22 that serves as a camshaft.
- the intake camshaft 22 includes an intake cam 25 and is provided so as to be rotatable with respect to the cylinder head 20.
- the intake cam 25 is in contact with the upper end of the intake valve 21.
- the intake cam 25 rotates to raise and lower the intake valve 21.
- the intake valve 21 opens and closes between the intake port and the combustion chamber by raising and lowering, and controls the introduction of combustion air from the intake device to the combustion chamber.
- the exhaust camshaft 24 includes an exhaust cam 26 and is provided so as to be rotatable with respect to the cylinder head 20.
- the exhaust cam 26 is in contact with the upper end of the exhaust valve 23. As the exhaust camshaft 24 rotates, the exhaust cam 26 rotates to raise and lower the exhaust valve 23.
- the exhaust valve 23 opens and closes between the combustion chamber and the exhaust port by raising and lowering, and controls the exhaust of the exhaust from the combustion chamber to the exhaust device.
- the power transmission mechanism 40 includes a crankshaft pulley 41 and an auxiliary pulley 42 as driving pulleys, an intake camshaft pulley 43 and a rotation phase difference variable actuator 44 as driven pulleys.
- crankshaft pulley 41 and the auxiliary machine pulley 42 are attached to the front end of the crankshaft 11.
- the crankshaft pulley 41 is disposed inside the cover 48, and the accessory pulley 42 is disposed outside the cover 48.
- the intake camshaft pulley 43 and the rotation phase difference variable actuator 44 are attached to the front end portion of the intake camshaft 22.
- the rotation phase difference variable actuator 44 rotates the intake camshaft 22 so that the intake camshaft 22 generates a rotation phase difference with respect to the intake camshaft pulley 43.
- the rotation phase difference variable actuator 44 adjusts the rotation phase difference between the crankshaft 11 and the intake camshaft 22 in accordance with the driving situation.
- FIG. 1 shows a state where the intake camshaft pulley 43 is exposed by removing the rotational phase difference variable actuator 44.
- the exhaust camshaft pulley 45 is attached to the front end portion of the exhaust camshaft 24.
- the timing belt 46 is wound around the crankshaft pulley 41, the intake camshaft pulley 43, and the exhaust camshaft pulley 45.
- the rotation of the crankshaft pulley 41 is transmitted to the intake camshaft pulley 43 and the exhaust camshaft pulley 45 by the timing belt 46.
- crankshaft 11 The rotation of the crankshaft 11 is transmitted through the path of the crankshaft pulley 41 ⁇ the timing belt 46 ⁇ the intake camshaft pulley 43 ⁇ the intake camshaft 22 ⁇ the intake cam 25 ⁇ the intake valve 21 to open and close the intake port. .
- the timing belt 46 is formed of a rubber toothed belt, and includes a core wire 51 serving as a core, a tooth side rubber 52 constituting a tooth side, and a back side rubber 53 constituting a back side. And a tooth cloth 54 attached to the surface of the tooth side rubber 52.
- the tooth cloth 54 is made of nylon and aramid fibers.
- the teeth 55 are formed by the tooth side rubber 52.
- the tooth side rubber 52 and the back side rubber 53 contain a stress light emitting material that emits light when receiving external force.
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- the tensioner 47 is disposed between the crankshaft pulley 41 and the intake camshaft pulley 43 so as to press the timing belt 46 from the back side.
- the tensioner 47 includes a tension roller 61 and a tension spring 62.
- the tension spring 62 applies an urging force that presses the timing belt 46 to the tension roller 61.
- the tension roller 61 presses the timing belt 46 from the back side of the timing belt 46 and applies an appropriate tension to the timing belt 46.
- the timing belt 46 is prevented from loosening from the intake camshaft pulley 43, the exhaust camshaft pulley 45, and the crankshaft pulley 41 due to the pressing of the tension roller 61.
- the rotation direction of the timing belt 46 is from the crankshaft pulley 41 to the tensioner 47 ⁇ the intake camshaft pulley 43 ⁇ the exhaust camshaft pulley 45 ⁇ the crankshaft pulley 41 as indicated by an arrow in the drawing.
- the cover 48 is provided so as to contact the engine block front end surface 6a of the engine body 6 and covers the entire timing belt 46 to shield it from light.
- the cover 48 is made of non-permeable plastic, and includes a cover body 71, an optical sensor holding part 72 that holds the optical sensor 49, a light shielding part 73 provided in the vicinity of the optical sensor holding part 72, and a gasket 74. I have.
- the peripheral edge of the cover main body 71 is in contact with the engine block front end face 6a via the gasket 74. This prevents outside light from entering the cover 48 from between the peripheral edge of the cover main body 71 and the engine block front end face 6a.
- the gasket 74 is pressed by the peripheral edge of the cover body 71 toward the engine block front end surface 6a. Thereby, even if the peripheral edge of the cover main body 71 is slightly separated from the engine block front end surface 6a due to thermal deformation of the cover main body 71, the gasket 74 is elastically deformed, so that the peripheral end edge of the cover main body 71 and the engine block front end surface are A gap is not generated between 6a and 6a.
- the optical sensor holding part 72 is provided at a position facing the tooth side of the timing belt 46 immediately after passing through the tensioner 47.
- the optical sensor holding part 72 has a cylindrical shape, and holds the optical sensor 49 in its inner part.
- the optical sensor holding unit 72 holds the optical sensor 49 such that the detection direction of the optical sensor 49 is directed to the tooth side of the timing belt 46.
- the light shielding portion 73 is provided so as to surround at least a part of the periphery of the optical sensor holding portion 72 except for the region of the optical path from the timing belt 46 to the optical sensor 49.
- the light shielding portion 73 includes a back plate 73 a provided behind the optical sensor 49 and a side plate 73 b provided between the optical sensor 49 and the intake camshaft pulley 43.
- the optical sensor 49 is a photodiode. This optical sensor 49 detects the luminance (cd ⁇ m ⁇ 2 ) on the tooth side of the timing belt 46 as a photometric quantity.
- the photodiode has a pn junction or a pin structure. When a photon having sufficient energy is incident on the pn junction or pin structure, electrons are excited and a current (A) is generated. This current is input to the ECU 4 described later. Thereby, the light emitted from the timing belt 46 is processed as an electric current in the ECU 4.
- the ECU 4 is rewritable with a central processing unit (CPU) as a central processing unit, a ROM (Read Only Memory) that stores fixed data, and a RAM (Random Access Memory) that temporarily stores data. It has an EEPROM (Electrically Erasable and Programmable Read Only Memory) and an input / output interface circuit composed of a non-volatile memory.
- CPU central processing unit
- ROM Read Only Memory
- RAM Random Access Memory
- the ECU 4 is connected to various sensors such as an optical sensor 49 and a crank sensor (not shown).
- the ROM of the ECU 4 stores programs and data necessary for various determinations such as a timing belt 46 replacement determination program.
- the crank position sensor detects the rotational speed (rpm) of the crankshaft 11 and outputs a detection signal corresponding to the detected rotational speed to the ECU 4.
- the ECU 4 also sets the number of teeth Tp (sheets) of the crankshaft pulley 41, the number of teeth Tb (sheets) of the timing belt 46, and the rotation speed of the crankshaft 11 represented by the detection signal output from the crank position sensor.
- the number of rotations n (rotation) of the timing belt 46 Nc ⁇ T ⁇ (Tp / Tb) is calculated from Nc (rpm) and the measurement time T (min).
- the ECU 4 includes a deterioration-replacement determination unit 80.
- the deterioration-replacement determination unit 80 determines that the timing belt 46 is deteriorated when the luminance of the timing belt 46 exceeds a predetermined light emission threshold value 87 or the luminance of the timing belt 46 changes in a predetermined light emission pattern. It is determined that the replacement period has been reached.
- the deterioration-replacement determination unit 80 includes a setting unit 81, a light increase determination unit 82, a pattern determination unit 83, and a replacement determination unit 84.
- the setting unit 81 sets an average photometric value 86 based on the luminance photometric value 85 detected by the optical sensor 49 when the timing belt 46 is mounted, and experimentally sets the average photometric value 86 to the average photometric value 86.
- the light emission threshold value 87 is set by adding a predetermined predetermined luminance value.
- the brightening determination unit 82 determines that the timing belt 46 has deteriorated when the photometric value 85 of the timing belt 46 exceeds the light emission threshold value 87.
- the pattern determination unit 83 determines that the tooth cloth 54 of a specific part of the timing belt 46 is cracked due to the luminance of the timing belt 46 changing with a predetermined light emission pattern, and the timing belt 46 is deteriorated. It comes to judge.
- the predetermined light emission pattern is such that a photometric value 85 of a specific portion of the timing belt 46 protrudes by forming a pulse waveform 88 periodically every round of the timing belt 46.
- the replacement determination unit 84 determines that the timing belt 46 has reached the replacement time when it is determined by at least one of the brightening determination unit 82 and the pattern determination unit 83 that the timing belt 46 has deteriorated. Yes.
- the warning device 5 is connected to the ECU 4.
- the warning device 5 gives a warning to the driver to replace the timing belt 46.
- a warning lamp or a warning buzzer provided in the driver's seat can be employed.
- crankshaft pulley 41, the intake camshaft pulley 43, the exhaust camshaft pulley 45, the timing belt 46, the cover 48, the optical sensor 49, and the ECU 4 according to the present embodiment relate to the present invention. It constitutes a power transmission device.
- the flowchart shown in FIG. 5 represents the execution contents of the timing belt 46 replacement determination program executed by the CPU of the ECU 4 using the RAM as a work area. In addition, this process is executed by the CPU of the ECU 4 at a predetermined time interval from when the ignition is turned on to when it is turned off.
- the time interval here is appropriately selected depending on the vehicle type, the engine 3, and the setting specifications of the timing belt 46. If this time interval is too long, the accuracy of judgment may be reduced, and if it is too short, the processing may become complicated. Therefore, the time interval is appropriately set based on these conditions.
- step S11 When the engine 3 is started for the first time after the timing belt 46 is mounted (step S11), the timing belt 46 rotates as the crankshaft 11 rotates. The tension acts on the timing belt 46 by the rotation. Stress is generated in the timing belt 46 by this tension. Due to this stress, an external force acts on the stress luminescent material contained in the tooth side rubber 52 and the back side rubber 53 of the timing belt 46, and the stress luminescent material emits light.
- the light emitted from the tooth side rubber 52 and the back side rubber 53 of the timing belt 46 passes through the tooth cloth 54 while reducing the luminance.
- the light transmitted through the tooth cloth 54 is received by the optical sensor 49 and converted into an electric signal of current (A).
- An electric signal from the optical sensor 49 is input to the ECU 4.
- the various processes of the photometric value are actually performed as current processes in the ECU 4.
- the brightness of the timing belt 46 varies slightly depending on the site depending on the density of the stress luminescent material. For this reason, for example, as shown in FIG. 6, a periodic wave is seen in the luminance photometric value 85 of the timing belt 46 every rotation of the timing belt 46.
- the ECU 4 calculates the average value of the luminance photometric value 85 of the timing belt 46 in the setting unit 81 and sets it as the average photometric value 86 (step S ⁇ b> 12).
- the ECU 4 sets a deterioration threshold value 87 by adding a predetermined luminance value to the average photometric value 86 of the photometric value 85 in the setting unit 81 (step S13).
- the deterioration threshold value 87 is a value indicating that the timing belt 46 has deteriorated to such an extent that a replacement warning should be issued if the luminance photometric value 85 of the timing belt 46 exceeds the threshold value.
- Step S12 and step S13 described above are steps that are performed only once immediately after the timing belt 46 is mounted. Therefore, step S12 and step S13 are skipped when the engine 3 is started next until the timing belt 46 is replaced.
- the brightness of the timing belt 46 is constantly measured by the optical sensor 49 and the ECU 4 (step S14).
- the timing belt 46 when used for a long period of time, for example, the timing belt 46 may be easily stretched with respect to the tension, or may be thin or thin without being stretched to generate a large stress. In these cases, the amount of light emitted from the timing belt 46 is larger than before the timing belt 46 is used for a long time.
- the use of the timing belt 46 for a long period of time causes the tooth cloth 54 to wear and become thin, and light emitted from the tooth side rubber 52 and the back side rubber 53 is sufficiently transmitted through the tooth cloth 54.
- the light emission amount of 46 increases. Therefore, it is desirable to determine whether or not the luminance photometric value 85 exceeds the deterioration threshold value 87 in order to detect deterioration of the timing belt 46.
- the ECU 4 determines in the brightening determination unit 82 whether the luminance photometric value 85 of the timing belt 46 is smaller than the deterioration threshold value 87 (step S15).
- the ECU 4 determines that at least a part of the luminance photometric value 85 of the timing belt 46 exceeds the deterioration threshold value 87 (NO in step S15)
- the ECU 4 determines that the timing belt 46 has deteriorated. To do.
- the ECU 4 determines in the replacement determination unit 84 that the timing belt 46 has reached the replacement time. As a result, the warning device 5 issues a warning prompting the replacement of the timing belt 46 (step 17).
- the tooth base of the tooth 55 of the tooth side rubber 52 may be extended or the tooth base may be cracked and the tooth 55 may be chipped, and the tooth cloth 54 may be cracked.
- the luminance of the timing belt 46 is locally increased periodically at each rotation, and a pulse waveform 88 is generated. Therefore, it is desirable to detect a pulse waveform 88 that is a periodic protrusion of the luminance of the timing belt 46 in order to detect deterioration of the timing belt 46.
- the pattern determining unit 83 has a periodic pulse waveform 88 in the luminance photometric value 85. Is determined (step S16).
- step S16 When the ECU 4 determines in the pattern determination unit 83 that the luminance photometric value 85 has a periodic pulse waveform 88 (step S16; YES), the tooth cloth 54 in a specific portion of the timing belt 46 is cracked and the timing is reached. It is determined that the belt 46 has deteriorated.
- the ECU 4 determines in the replacement determining unit 84 that the timing belt 46 has reached the replacement time. As a result, the warning device 5 issues a warning prompting the replacement of the timing belt 46 (step 17).
- step S16 when the ECU 4 determines that the pattern photometric value 85 has no periodic pulse waveform 88 in the pattern determination unit 83 (step S16; NO), the timing belt 46 has not deteriorated enough to be replaced. After determination, the luminance of the timing belt 46 is measured again by the optical sensor 49 and the ECU 4 (step S14).
- the power transmission device 1 it is possible to directly determine whether or not the timing belt 46 is in the replacement period based on the light emission amount and the light emission pattern of the timing belt 46. . For this reason, since the state of the timing belt 46 is directly detected, the replacement timing of the timing belt 46 is determined based on the number of revolutions and the operating time of the engine 3 without measuring the state of the timing belt 46 as in the prior art. Compared to the case, the accuracy of the determination of the replacement timing of the timing belt 46 can be increased.
- the pattern determination unit 83 can detect the elongation or crack of the tooth base of the tooth 55 by detecting the crack of the tooth cloth 54 of the timing belt 46, it predicts in advance the tooth missing of the timing belt 46. be able to.
- the optical sensor 49 is provided at a position facing the tooth side of the timing belt 46 immediately after passing through the tensioner 47. Since the timing belt 46 is bent by the tensioner 47 with the back side inward, immediately after passing through the tensioner 47, the teeth 55 are most likely to be chipped. For this reason, since the luminance is detected at the position where the teeth 55 of the timing belt 46 are most likely to be missing, the detection accuracy of the deterioration of the timing belt 46 can be improved.
- optical sensor 49 is built in the inner part of the cylindrical optical sensor holding part 72, it is possible to prevent the optical sensor 49 from erroneously detecting external light. Furthermore, since the light-shielding part 73 is provided around the optical sensor 49, it is possible to further prevent the optical sensor 49 from erroneously detecting external light.
- the optical sensor 49 is held by the optical sensor holding part 72 integrated with the cover main body 71, the optical sensor 49 is caused by the variation of the cover 48 even if the cover 48 is deformed by the heat of the engine main body 6. It will fluctuate. For this reason, the relative position of the optical sensor 49 and the light shielding part 73 is hardly changed.
- the optical sensor 49 is disposed at a position facing the tooth side of the timing belt 46 immediately after passing through the tensioner 47.
- the invention is not limited to this.
- the optical sensor 49 can be arranged at another position.
- the optical sensor 31 is provided in the vicinity of the intake camshaft pulley 43 between the tensioner 47 and the intake camshaft pulley 43, or the optical sensor is provided between the intake camshaft pulley 43 and the exhaust camshaft pulley 45.
- 32 may be provided, or the optical sensor 33 may be provided between the exhaust camshaft pulley 45 and the crankshaft pulley 41.
- the optical sensor 49 is held by the optical sensor holding portion 72 of the cover 48.
- the invention is not limited thereto.
- the optical sensor 49 can be fixed on the surface of the engine block front end surface 6a.
- the optical sensor 49 is arranged facing the tooth side of the timing belt 46, but the power transmission device according to the present invention is not limited to this,
- the optical sensor 49 can be arranged facing the back side of the timing belt 46.
- the stress light emitting material is contained in both the tooth side rubber 52 and the back side rubber 53 of the timing belt 46, but in the power transmission device according to the present invention.
- the stress-stimulated luminescent material only needs to be contained in the rubber on the side where the optical sensor 49 detects the luminance.
- the stress-stimulated luminescent material only needs to be contained in the tooth side rubber 52, and the optical sensor 49 is connected to the back of the timing belt 46.
- the stress-stimulated luminescent material only needs to be contained in at least the back rubber 53.
- the power transmission device 1 of the present embodiment described above europium-added strontium aluminate is used as the stress luminescent material.
- the power transmission device according to the present invention is not limited to this, and the stress luminescent material.
- Zinc sulfide (ZnS: Mn) to which manganese is added as the luminescent center can be used.
- the timing belt 46 emits yellow-orange light.
- a toothed belt is used as the belt.
- the power transmission device according to the present invention is not limited to this, and a flat belt, a V belt, etc. Other types of belts can be used.
- the gasket 74 is provided between the peripheral edge of the cover body 71 and the engine block front end surface 6a.
- the power transmission device according to the present invention is not limited to this, and without using the gasket 74, for example, the engine block front end face 6a and the peripheral edge of the cover main body 71 can be combined in a so-called inlay structure.
- a groove deeper than the thermal deformation amount of the cover main body 71 can be formed in the engine block front end surface 6a, and the peripheral edge of the cover main body 71 can be inserted to the bottom of the groove.
- the cover 48 is provided at the front portion of the engine body 6.
- the power transmission device according to the present invention is not limited to this, for example, an engine room. If the inside is sufficiently shielded and the luminance of the timing belt 46 can be sufficiently detected by the optical sensor 49, the cover 48 can be omitted.
- a photodiode is used as the optical sensor 49.
- the power transmission device according to the present invention is not limited to this, and for example, other photovoltaic power.
- An optical sensor using the effect can be used. Examples of the optical sensor using the photovoltaic effect include a phototransistor, a photo IC, and a solar cell.
- the present invention is not limited to an optical sensor using the photovoltaic effect, but an optical sensor using a photoconductive effect such as a CdS (cadmium sulfide) cell, a CdSe (cadmium selenide) cell, or a PbS (lead sulfide) cell, You may use the optical sensor using photoelectron emission effects, such as a conduit
- an in-line four-cylinder engine is adopted as the engine 3, but the power transmission device according to the present invention is not limited to this, for example, an in-line six-cylinder engine.
- Various types of engines such as a V-type 6-cylinder engine, a V-type 12-cylinder engine, and a horizontally opposed 6-cylinder engine can be employed.
- the power transmission device 1 of the present embodiment described above an engine using gasoline as fuel is adopted as the engine 3, but the power transmission device according to the present invention is not limited to this, for example, light oil or the like. It can be set as the engine which uses as fuel a hydrocarbon fuel or alcohol fuel which mixed alcohol, such as ethanol, and gasoline.
- the power transmission device 1 of the present embodiment described above is used for the engine 3 of the automobile 2.
- the power transmission device according to the present invention is not limited to this, and the driving pulley and The present invention can be applied to all power transmission devices that transmit power from a driving pulley to a driven pulley by a belt wound around the driven pulley.
- the power transmission device according to the present invention is useful for all power transmission devices suitable for detecting the replacement time of the belts wound around the driving pulley and the driven pulley.
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
Abstract
Description
2 自動車
3 エンジン(内燃機関)
4 ECU(交換時期判断部、劣化-交換判断部、設定部、増光判定部、パターン判定部、交換判断部、測光値、平均測光値、発光閾値)
5 警告装置
6 エンジン本体
11 クランクシャフト(駆動軸)
22 吸気カムシャフト(従動軸、カムシャフト)
24 排気カムシャフト(従動軸、カムシャフト)
31 光センサ
32 光センサ
33 光センサ
41 クランクシャフトプーリ(駆動側プーリ)
43 吸気カムシャフトプーリ(従動側プーリ)
45 排気カムシャフトプーリ(従動側プーリ)
46 タイミングベルト(ベルト)
47 テンショナ
48 カバー
49 光センサ
54 歯布
72 光センサ保持部
73 遮光部
80 劣化-交換判断部
81 設定部
82 増光判定部
83 パターン判定部
84 交換判断部
85 測光値
86 平均測光値
87 劣化閾値
88 パルス波形(突出)
Claims (6)
- 駆動軸に設けられた駆動側プーリと、従動軸に設けられた従動側プーリと、前記駆動側プーリおよび前記従動側プーリに掛け回されたベルトとを備えた動力伝達装置において、
前記ベルトは、外力を受けることにより発光する応力発光材料を含有し、
前記ベルトに対向して配置されるとともに前記ベルトの測光を行う光センサと、
前記光センサで検出された測光値に基づいて、前記ベルトが劣化しているか否かを判断するとともに、前記ベルトが劣化していると判断したことを条件として前記ベルトが交換時期に達したと判断する交換時期判断部とを備えることを特徴とする動力伝達装置。 - 前記交換時期判断部は、前記測光値が所定の発光閾値を超えるかまたは前記測光値が所定の発光パターンで変化するかの少なくとも一方であることを条件として、前記ベルトが劣化していると判断するとともに前記交換時期に達したと判断する劣化-交換判断部を備えることを特徴とする請求項1に記載の動力伝達装置。
- 前記ベルトは、歯付きベルトであるとともに歯面側に設けられた歯布を有し、
前記光センサは前記ベルトの前記歯布側に対向して配置され、
前記劣化-交換判断部は、
前記ベルトの装着当初に前記光センサで検出された前記測光値に基づき平均測光値を設定するとともに、前記平均測光値に所定値を加えて前記発光閾値を設定する設定部と、
前記ベルトの前記測光値が前記発光閾値を超えることを条件として、前記ベルトが劣化していると判定する増光判定部と、
前記発光パターンは前記ベルトの特定の部分の前記測光値が周期的に突出するものであるとともに、
前記測光値が前記発光パターンで変化することを条件として、前記特定の部分の前記歯布が亀裂していると判断して前記ベルトが劣化していると判定するパターン判定部と、
前記増光判定部および前記パターン判定部の少なくとも一方により前記ベルトが劣化していると判定されたことを条件として、前記ベルトが前記交換時期に達したと判断する交換判断部とを備えることを特徴とする請求項2に記載の動力伝達装置。 - 前記駆動側プーリと前記従動側プーリとの間に、前記ベルトを背側から押圧するテンショナを備えるとともに、
前記光センサは、前記テンショナを通過した直後の前記タイミングベルトに対向する位置に配置されること特徴とする請求項1ないし請求項3のいずれか1の請求項に記載の動力伝達装置。 - 前記ベルトの全体を覆って遮光するカバーを備えるとともに、
前記カバーは、前記光センサを前記ベルトに対向させて保持する光センサ保持部と、前記ベルトから前記光センサへの光路の領域を除き前記光センサ保持部の周囲の少なくとも一部を取り囲んで設けられる遮光部とを有することを特徴とする請求項1ないし請求項4のいずれか1の請求項に記載の動力伝達装置。 - 前記駆動軸は内燃機関のクランクシャフトであり、前記従動軸はカムシャフトであり、前記ベルトはタイミングベルトであることを特徴とする請求項1ないし請求項5のいずれか1の請求項に記載の動力伝達装置。
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
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BR112013022149A BR112013022149A2 (pt) | 2011-03-11 | 2011-03-11 | aparelho de transmissão de energia |
CN2011800691875A CN103443607A (zh) | 2011-03-11 | 2011-03-11 | 动力传递装置 |
US14/004,330 US9240115B2 (en) | 2011-03-11 | 2011-03-11 | Power transmission apparatus |
EP20110860970 EP2685229A4 (en) | 2011-03-11 | 2011-03-11 | POWER TRANSMISSION DEVICE |
JP2013504395A JP5655929B2 (ja) | 2011-03-11 | 2011-03-11 | 動力伝達装置 |
PCT/JP2011/001430 WO2012123983A1 (ja) | 2011-03-11 | 2011-03-11 | 動力伝達装置 |
Applications Claiming Priority (1)
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PCT/JP2011/001430 WO2012123983A1 (ja) | 2011-03-11 | 2011-03-11 | 動力伝達装置 |
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US (1) | US9240115B2 (ja) |
EP (1) | EP2685229A4 (ja) |
JP (1) | JP5655929B2 (ja) |
CN (1) | CN103443607A (ja) |
BR (1) | BR112013022149A2 (ja) |
WO (1) | WO2012123983A1 (ja) |
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DE102013214303A1 (de) * | 2013-07-22 | 2015-01-22 | Robert Bosch Gmbh | Verfahren und Vorrichtung zur Ermittlung einer Position einer Nockenwelle und einer Phase einer Verbrennungskraftmaschine |
KR101655215B1 (ko) | 2015-03-09 | 2016-09-07 | 현대자동차 주식회사 | 보기류 검사 장치 및 이를 포함하는 검사 시스템 |
DK3126810T3 (en) * | 2015-05-07 | 2018-05-14 | Walther Flender Gmbh | DRIVE DRIVE AND PROCEDURE FOR MONITORING SUCH A DRIVE DRIVE |
US10118770B2 (en) * | 2015-12-22 | 2018-11-06 | Panasonic Intellectual Property Management Co., Ltd. | Electronic component mounter and electronic component mounting system |
US10107216B2 (en) | 2016-06-09 | 2018-10-23 | Ford Global Technologies, Llc | System and method for reactivating engine cylinders |
CN115431996A (zh) | 2017-01-20 | 2022-12-06 | 北极星工业有限公司 | 车辆的车辆诊断方法 |
CN106838157A (zh) * | 2017-03-13 | 2017-06-13 | 钟浪雅 | 一种可测量转动速度的啮齿皮带轮 |
US10502690B2 (en) * | 2017-07-18 | 2019-12-10 | Ford Global Technologies, Llc | Indicator system for vehicle wear components |
US10774739B2 (en) * | 2018-01-22 | 2020-09-15 | Ford Motor Company | Method and system for detecting misalignment of a front end accessory drive belt |
CN109018915B (zh) * | 2018-06-27 | 2020-03-17 | 中国矿业大学 | 可移动式带式输送机断带防护及抓捕*** |
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JP5655929B2 (ja) | 2015-01-21 |
BR112013022149A2 (pt) | 2016-12-06 |
EP2685229A4 (en) | 2015-01-07 |
JPWO2012123983A1 (ja) | 2014-07-17 |
US9240115B2 (en) | 2016-01-19 |
CN103443607A (zh) | 2013-12-11 |
US20130345946A1 (en) | 2013-12-26 |
EP2685229A1 (en) | 2014-01-15 |
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