JP4209259B2 - Chassis dynamometer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lubrication technique for a chassis dynamometer provided with a roller for simulating a road surface with respect to vehicle driving wheels, which is used for measuring a running characteristic of a vehicle.
[0002]
[Prior art]
FIG. 5 shows a conventional typical configuration of a chassis dynamometer including a roller that simulates a road surface with respect to vehicle driving wheels.
In the figure, a is a front view of the chassis dynamometer, b is a right side view of the chassis dynamometer, and c is a top view of the chassis dynamometer. Further, d in the figure is a diagram schematically showing the bearing structure of the chassis dynamometer. However, the right side view of b in the figure shows a form seen through a roller (shown by a wavy line) to be described later.
[0003]
As shown in the figure, in this configuration, the frame 104 is supported by the bearing column 102 fixed to the base 101 so as to be swingable via the bearing 103, and the frame 107 of the dynamometer 106 via the bearing 108. The shaft 104 is rotatably supported. The rollers 105 are coupled to the left and right ends of the shaft 104 so as to rotate together with the shaft 104. Further, the shaft 104 is fixed to the rotor 109 in the dynamometer 106, and the rotor 109 interacts with the stator 110 fixed to the frame 107 so as to form a gap between the rotor 109 and the frame 107. Get torque against.
[0004]
The rotor 109, the shaft 104, and the roller 105 are rotated with respect to the system of the base 101 by the torque of the rotor 109 with respect to the frame 107, and the stator 110 and the frame 107 are rotated according to the torque applied to the roller 105 by the vehicle driving wheels. It swings with respect to the base 101 system. Therefore, by measuring the load applied to the arm 111 fixed to the frame 107 with the load meter 112, the action between the roller 105 and the vehicle driving wheel can be measured.
[0005]
As described above, in this configuration, the bearing 103 provided on the bearing column 102 serves as a rocking bearing for the dynamometer 106, and the bearing 108 provided on the dynamometer 106 serves as a rotary bearing for the roller 105. ing.
Conventionally, the lubrication of the bearing 108 serving as a rotary bearing that rotates relative to the dynamometer 106 of the shaft 104 has been performed using grease. Japanese Patent Laid-Open No. 09-257656 is a document relating to a chassis dynamometer having such a dynamometer swing and roller rotation bearing structure.
In such a conventional chassis dynamometer, grease is used to lubricate the bearing 108 which is a rotary bearing that rotates relative to the dynamometer 106 of the shaft 104. Therefore, when replacing the deteriorated grease, the dynamometer It took a lot of labor and time for maintenance, such as the need to disassemble.
[0006]
Thus, it is conceivable to use circulating oil instead of grease for lubricating the bearing 108. That is, a configuration is conceivable in which the lubricating oil is transferred upward from the oil tank using a pump and dropped onto the bearing 108 from above, and the lubricating oil that naturally falls below the bearing 108 is recovered in the oil tank.
[0007]
However, according to this configuration, there is a possibility that the supply of the lubricating oil to the dynamometer may be stopped due to a pump failure or a clogged pipe, and the dynamometer is stopped in such a state that the supply of the lubricating oil is stopped. If the operation is continued, various troubles such as heat generation and damage occur.
[0008]
On the other hand, as a technique for monitoring the normality of the supply of a general non-circulating lubricant, a float switch is provided in the oil tank, and the lubricant is based on the amount of lubricant pooled in the oil tank detected using the float switch. A technique for determining the normality of supply is known (for example, JP-A-6-074392).
[0009]
Prior art document information relating to the invention of this application includes the following.
[0010]
[Patent Document 1]
Japanese Patent Laid-Open No. 09-257656 [0011]
[Patent Document 2]
Japanese Patent Application Laid-Open No. 06-074392
[Problems to be solved by the invention]
When the technology for judging the normality of the lubricating oil supply based on the amount of the lubricating oil pooled in the oil tank is applied to the monitoring of the lubricating oil supply of the dynamometer performed by the circulation of the lubricating oil, The following problems occur. That is, for example, when the supply side piping is clogged, there is no change in the amount of lubricating oil pooled in the oil tank, or there is a change in the amount of lubricating oil pooled in the oil tank after the supply side piping is clogged. Due to the relatively large time lag before it appears, proper dynamometer lubricant supply monitoring cannot be performed. That is, according to this technique, it is not possible to ensure the reliability of the supply monitoring of the lubricating oil in the dynamometer.
[0013]
Therefore, an object of the present invention is to monitor the supply of lubricating oil of a dynamometer with higher reliability.
[0014]
[Means for Solving the Problems]
To achieve the above object, the present invention provides a chassis dynamometer comprising a roller on which a vehicle driving wheel is mounted, a shaft coupled to the roller, and a dynamometer that rotationally drives the shaft. Receiving the rotating bearing of the shaft, the lubricating oil supply path for guiding the lubricating oil supplied to the lubricating oil supply port provided at the top of the dynamometer to the upper part of the rotating bearing, and the lubricating oil falling from the rotating bearing; A lubricating oil discharge passage leading to a lubricating oil discharge port provided at a lower portion of the dynamometer is provided, and the chassis dynamometer is provided with a rotary bearing for relative rotation between the shaft installed in the dynamometer and the dynamometer. An oil tank for pooling the lubricating oil to be supplied, a pump for pumping the lubricating oil contained in the oil tank from the discharge port, and a pump Lubricating oil pumped from the discharge port is guided to the top of the dynamometer, and a supply pipe for supplying the lubricating oil from the lubricating oil supply port to the lubricating oil supply passage, and the lubricating oil discharged from the lubricating oil discharge port are used as the lubricating oil. A recovery pipe that is received below the discharge port and led to the oil tank, and an amount or a dripping number of the lubricating oil supplied from the supply pipe to the lubricating oil supply path is indicated by the supply pipe and the lubricating oil supply path. Or a lubricating oil monitor for detecting in the lubricating oil supply path.
[0015]
Here, the lubricant monitor forms, for example, the supply pipe and the lubricant supply port at the top of the dynamometer and forms a lubricant passage between the supply pipe and the lubricant supply port. Thus, the amount of lubricating oil passing through the formed lubricating oil passage or the number of drippings can be detected.
[0016]
According to such a chassis dynamometer, the amount of lubricating oil supplied at the position where the lubricating oil is actually supplied to the dynamometer at the tip of the supply pipe for guiding the lubricating oil from the pump to the top of the top of the dynamometer Since the number of drops is directly detected, the supply of lubricating oil to the dynamometer can be monitored more reliably and reliably even when the supply pipe is clogged.
[0017]
Therefore, in such a chassis dynamometer, the supply abnormality of the lubricant is detected according to the detection content of the lubricant monitor, and when the supply abnormality is detected, the operation of the dynamometer is forcibly stopped and a warning is issued. According to the abnormality processing means that performs at least one of the output and the detection content of the lubricant monitor, the supply amount of the lubricant is calculated, and the calculated supply amount is within a predetermined range. Providing lubricating oil supply control means for controlling the operation of the pump makes it possible to perform more reliable abnormality processing and lubricating oil supply control when lubricating oil is abnormal.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows the configuration of the chassis dynamometer according to this embodiment.
In the figure, a is a front view of the chassis dynamometer, b is a right side view of the chassis dynamometer, and c is a top view of the chassis dynamometer. Further, d in the figure is a diagram schematically showing the bearing structure of the chassis dynamometer.
As shown, the basic configuration of the chassis dynamometer according to the present embodiment is the same as the configuration of the conventional chassis dynamometer described with reference to FIG. In addition, the right side view of b in the figure shows a form seen through a roller (shown by a wavy line) to be described later.
In other words, the frame 7 is supported by the bearing column 2 fixed to the base 1 so as to be swingable via the second bearing 3, and the shaft 4 is supported by the frame 7 of the dynamometer 6 via the first bearing 8. It is rotatably supported. The rollers 5 are connected to the left and right ends of the shaft 4 so as to rotate together with the shaft 4. The shaft 4 is fixed to the rotor 9 inside the dynamometer 6, and the rotor 9 interacts with the stator 10 fixed to the frame 7 so as to form a gap between the rotor 9 and the frame 9. Torque for 7 is obtained.
[0019]
The rotor 9, the shaft 4, and the roller 5 rotate with respect to the system of the base 1 by the torque of the rotor 9 with respect to the frame 7, and the stator 10 and the frame according to the torque applied to the roller 5 by the vehicle drive wheels. 7 swings relative to the base 1 system. Therefore, the load applied to the arm 11 fixed to the frame 7 can be measured by the load meter 12. Then, while measuring the action between the roller 5 and the vehicle driving wheel, the operation controller 13 drives the dynamometer 6 to apply a desired torque to the vehicle driving wheel or from the vehicle under a desired condition. The applied torque can be measured.
[0020]
On the other hand, the chassis dynamometer according to the present embodiment includes the following configuration as a configuration for lubricating the first bearing 8 and monitoring the supply of lubricating oil.
FIG. 2 is a diagram schematically showing a configuration for lubricating the first bearing 8 of such a chassis dynamometer. In FIG. 2, a indicates a configuration for lubricating the first bearing 8 as viewed from the side. In the figure, b shows a configuration for lubricating the first bearing 8 as seen from the front.
[0021]
As shown in the figure, the chassis dynamometer according to this embodiment is configured to drop lubricating oil from an oil tank 21 that pools lubricating oil, a pump 22, a supply pipe 23 fixed to the dynamometer 6, and the supply pipe 23. Lubricating oil monitor 24 to detect, recovery piping 25 for recovering lubricating oil from the dynamometer 6, lubricating oil supply passage 26 provided in the dynamometer 6, lubricating oil recovery passage 27 provided in the dynamometer 6, pump The hydraulic control unit 28 performs drive control 22 and the lubricating oil supply control unit 29 controls the supply of lubricating oil.
[0022]
In such a configuration, the pump 22 operates according to the control of the hydraulic control unit 28, sucks up the lubricating oil stored in the oil tank 21, and pumps it from the discharge port to the top of the dynamometer 6 through the supply pipe 23. To do. The supply pipe 23 is connected to the upper port of the lubricant monitor 24 fixed to the top of the dynamometer 6, and the lubricant fed by the pump 22 is dropped into the lubricant monitor 24. The lower port of the lubricating oil monitor 24 is connected to a connector serving as an inlet of a lubricating oil supply path 26 provided at the top of the dynamometer 6, and the lubricating oil dropped from the supply pipe 23 is left as it is in the upper part of the interior. It passes through a tunnel connecting the mouth and the lower mouth and falls into the lubricating oil supply path 26. The lubricating oil monitor 24 detects the passage of the lubricating oil droplets in the internal tunnel and notifies the lubricating oil supply control unit 29 of the passage.
[0023]
The lubricating oil supply path 26 is a vertical tunnel extending from the top of the dynamometer 6 to the top of the first bearing. The lubricating oil dropped from the supply pipe 23 via the lubricating oil monitor 24 and falling by gravity is supplied to the first bearing. Guide to the top. The lubricating oil supplied to the top of the first bearing 8 in this way lubricates the first bearing 8 while falling by gravity along the first bearing 8, and eventually the lubricating oil recovery path from the lower part of the first bearing 8. It falls into the receiving part of the wide mouth that forms 27 entrances. The lubricating oil recovery path 27 is a vertical tunnel extending from the lower side of the first bearing 8 to the lower end of the dynamometer 6 and guides the dropping of the lubricating oil received by the wide-mouth receiving portion into the recovery pipe 25. . The recovery pipe 25 guides the fall of the lubricating oil received from the lubricating oil recovery path 27 into the oil tank 21 due to the gravity.
[0024]
Next, FIG. 3 shows the configuration of the lubricant monitor 24.
In the drawing, a shows the appearance of the lubricant monitor 24, and b shows a cross section of the lubricant monitor 24 taken along the cut surface 301 in FIG. 3a.
As shown in the figure, the lubricant monitor 24 is a hollow box-like instrument provided with transparent monitoring windows 241 on the front and rear sides, and drops between the transparent monitoring windows 241 from the upper port 242 by the supply pipe 23. The lubricating oil droplets passed by free fall. The passed lubricating oil is collected in the lower port 243 and falls into the lubricating oil supply path 26.
[0025]
Further, the lubricant monitor 24 is provided with an optical sensor 244 including a projector and a light receiver disposed to face the two monitoring windows 241, respectively. The optical sensor 244 is a lubricant between the two monitoring windows 241. The passage of oil is detected by blocking light, and the lubricating oil supply control unit 29 is notified.
[0026]
However, as the optical sensor 244, a reflection type optical sensor 244 including a light projecting and receiving device provided on one side of the monitoring window 241 and a reflecting mirror provided opposite to the other window may be used. . Further, in order to detect dripping of the lubricating oil, an ultrasonic sensor or any other sensor may be used instead of the optical sensor 244.
[0027]
Next, the operation of the lubricating oil supply control unit 29 that receives the notification of the dropping of the lubricating oil from the lubricating oil monitor 24 and controls the supply of the lubricating oil will be described.
FIG. 4 shows the procedure of the lubricating oil supply control process performed by the lubricating oil supply controller 29.
As shown in the figure, in this process, first, the hydraulic control unit 28 is caused to control the pump 22 so as to feed the lubricating oil with a prescribed hydraulic pressure (step 402). Then, based on the notice of dripping of lubricating oil from the lubricating oil monitor 24, the number of dripping of lubricating oil per predetermined unit time (for example, 5 seconds) is calculated (step 404), and the number of dripping is set in advance. It is checked whether or not it is within the abnormal range (step 406). If it is within the abnormal range, the hydraulic control unit 28 and the operation control unit 13 stop the operation of the pump 22 and the dynamometer 6 (step 418). A warning is output by turning on the emergency lamp or outputting a warning sound (step 420).
[0028]
On the other hand, if the number of drops per unit time is not within the abnormal range, it is checked whether the number of drops is within a predetermined appropriate range (step 408). If the process is repeated and it is not within the proper range, the process proceeds to step 410. Here, assuming that the range of n2 or more and n3 or less is an appropriate range of the number of drops per unit time, and that less than n1 or more than n4 is an abnormal range of the number of drops per unit time, there is a relationship of n1 <n2 <n3 <n4. .
[0029]
In step 410, it is checked whether the number of drops per unit time is less than the minimum number n2 in the appropriate range. If the number is less than the minimum number n2, the oil pressure of the lubricating oil of the pump 22 is set to the oil pressure control unit 28 in advance. The level is increased (step 414), and the process returns to step 404.
[0030]
On the other hand, if the number of drops per unit time is not less than the minimum number n2 of the appropriate range, the number of drops per unit time is equal to or greater than the maximum number n3 of the appropriate range (step 412). The hydraulic pressure of the lubricating oil is decreased by a predetermined level (step 416), and the process returns to step 404.
[0031]
The embodiment of the present invention has been described above.
As described above, according to the present embodiment, since the lubricating oil actually dripping from the top of the dynamometer is detected, it is possible to detect the lubricating oil supply state to the first bearing 8 of the dynamometer 6 more reliably, Appropriate processing according to the detected content such as processing can be performed.
[0032]
In the embodiment described above, the number of lubricant drops is monitored, but this may be monitored for the amount of lubricant drop. That is, for example, when detecting the dripping of the lubricating oil using the optical sensor 244 as described above, the number of dripping of the lubricating oil can be detected as the number of times of the light blocking, and the dripping amount of the lubricating oil is the light blocking time. As a function of
[0033]
Further, in the above, the lubricant monitor 24 is interposed as a junction between the supply pipe 23 and the lubricant supply passage 26, and the dripping of the lubricant is detected at the top of the dynamometer 6, but this is possible. Alternatively, an optical sensor 244 or the like may be provided in the lubricating oil supply path 26 to detect dripping of the lubricating oil in the lubricating oil supply path 26 or at the end of the lubricating oil supply path.
In the above description, the application to a chassis dynamometer of the type in which the rollers 5 are provided on both sides of the dynamometer 6 has been described as an example. This technique is also applicable to a chassis dynamometer of the type in which one or a plurality of rollers 5 are provided only on one side of the dynamometer 6.
[0034]
【The invention's effect】
As described above, according to the present invention, it is possible to monitor the supply of lubricating oil of the dynamometer with higher reliability.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a chassis dynamometer according to an embodiment of the present invention.
FIG. 2 is a diagram showing a lubricating configuration of the chassis dynamometer according to the embodiment of the present invention.
FIG. 3 is a diagram showing a configuration of a lubricant monitor according to the embodiment of the present invention.
FIG. 4 is a flowchart showing a procedure of a lubricating oil supply control process according to the embodiment of the present invention.
FIG. 5 is a diagram showing a configuration of a conventional chassis dynamometer.
[Explanation of symbols]
1: base, 2: bearing column, 3: second bearing, 4: shaft, 5: roller, 6: dynamometer, 7: frame, 8: first bearing, 9: rotor, 10: stator, 11: arm, 12: Load meter, 13: Operation control unit, 21: Oil tank, 22: Pump, 23: Supply pipe, 24: Lubricating oil monitor, 25: Recovery pipe, 26: Lubricating oil supply path, 27: Lubricating oil recovery Road: 28: Hydraulic control unit, 29: Lubricating oil supply control unit, 241: Monitoring window, 242: Upper port, 243: Lower port, 244: Optical sensor.

Claims (4)

A chassis dynamometer comprising a roller for mounting a vehicle driving wheel, a shaft connected to the roller, and a dynamometer for rotationally driving the shaft,
The dynamometer falls from the rotary bearing, a rotary bearing of the shaft, a lubricant supply path for guiding the lubricant supplied to the lubricant supply port provided at the top of the dynamometer to the upper part of the rotary bearing, and the rotary bearing A lubricating oil discharge passage that receives the lubricating oil and leads to a lubricating oil discharge port provided at a lower portion of the dynamometer;
The chassis dynamometer
An oil tank for pooling lubricating oil to be supplied to the rotary bearing;
A pump for pumping the lubricating oil contained in the oil tank from a discharge port;
Lubricating oil pumped from the discharge port of the pump is guided to the top of the dynamometer, and a supply pipe for supplying the lubricating oil supply path from the lubricating oil supply port;
A recovery pipe that receives the lubricating oil discharged from the lubricating oil discharge port below the lubricating oil discharge port and leads to the oil tank;
A lubricant monitor that detects the amount or number of drops of lubricant supplied from the supply pipe to the lubricant supply path between the supply pipe and the lubricant supply path or in the lubricant supply path; A chassis dynamometer characterized by comprising: The chassis dynamometer according to claim 1,
The lubricating oil monitor connects the supply pipe and the lubricating oil supply port at the top of the dynamometer so as to form a lubricating oil path between the supply pipe and the lubricating oil supply port, A chassis dynamometer characterized in that the amount or amount of dripping of lubricating oil passing through the formed lubricating oil passage is detected. The chassis dynamometer according to claim 1 or 2,
An abnormality in which at least one of forced stop of the operation of the dynamometer and warning output is detected when the supply abnormality of the lubricant is detected according to the detection content of the lubricant monitor. A chassis dynamometer comprising processing means. A chassis dynamometer according to claim 1, 2 or 3,
Lubricating oil supply control means for controlling the operation of the pump so as to calculate the supply amount of the lubricating oil according to the detection content of the lubricating oil monitor and to make the calculated supply amount within a predetermined range. A chassis dynamometer characterized by that.

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