JP2007093326A - Car centering device for chassis dynamometer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily respond to variation of diameter of a tire of a driving wheel of the vehicle to be tested. <P>SOLUTION: The stationary bracket 15 of the cylinder mechanism 10 is fixed to the support 9 at the back and front of the roller for mounting the tire 5 of the vehicle to be tested, the tire supporting rollers 14 for pressing the tire 5 to the moveable side brackets 13 of the cylinder mechanism 10, and the stopper 20 driven by the motor 18 is fixed on the stationary side bracket 15, and on the moveable side bracket 13 includes the locking part 17 with the operation part 20a of the stopper 20. At the time of elevation of the cylinder rod 12 of the cylinder mechanism 10, the driving time of the motor 18 is set corresponding to the diameter of the tire 5 corresponding to each operation switch of the operation switches 21a-21f, the position of the operation part 20a of the stopper 20 is made to correspond to the diameter of the tire 5, and the position of the cylinder rod 12 is made to stop to the position corresponding to the diameter of the tire 5 by the locking part 17 is locked to the action part 20a. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a vehicle centering device for a chassis dynamometer.

  In the conventional chassis dynamometer, the tire of the driving wheel of the vehicle under test is placed on a roller connected to the dynamometer, and the performance test of the vehicle under test is performed while absorbing the power of the tire by the dynamometer. However, in the test, the center of the driving wheel tire in the front-rear direction must be placed directly above the rotating shaft of the roller, and a vehicle centering device is required for this purpose.

  Conventional vehicle dynamometer vehicle centering devices include those shown in Patent Literature 1 and Patent Literature 2, which will be described. 2A and 2B are a plan view and a longitudinal front view of a vehicle centering device of a conventional chassis dynamometer disclosed in Patent Document 1, wherein 1 is a roller, 2 is a power connected between the rollers 1, and FIG. The tire 5 of the driving wheel 4 of the vehicle under test 3 is placed on the roller 1, the vehicle under test 3 is driven, and various characteristics of the vehicle under test 3 are measured by the dynamometer 2 connected to the roller 1. test. In installation of the vehicle under test 3 in such a chassis dynamometer, the vehicle under test 3 is advanced on the roller 1 through the floor 8, and the center of the tire 5 in the front-rear direction is directly above the center of the roller 1. In this way, positioning is performed by the support units 6 provided before and after the tire 5, and the front and rear of the vehicle under test 3 are fixed by the fixing member 7 and the test is performed. The support unit 6 includes an arm, a moving means that moves the arm straight by a feed screw mechanism, a tire support roller that is attached to the tip of the arm and presses the tire 5, and the moving means moves the arm below the floor 8. Is moved obliquely upward through the opening 8a of the floor 8, and the circumferential surface of the tire 5 is pressed by the tire support roller at the tip of the arm so that the front-rear direction center of the tire 5 is positioned directly above the center line of the roller 1. Let

FIG. 3A shows a longitudinal front view of the vehicle centering device of the chassis dynamometer disclosed in Patent Document 2, wherein 9 is a support provided at the lower part of the floor 8, and the support 9 has an air cylinder mechanism. 10 is rotatably connected, and the air cylinder mechanism 10 is supported on the floor 8 side by a connecting member 11 so as to face obliquely upward. A movable side bracket 13 is attached to the cylinder rod 12 of the air cylinder mechanism 10. The tire support roller 14 is attached to the movable bracket 13. When installing the vehicle under test 3, the tire 5 is first placed on the exposed portion from the opening 8 a of the roller 1 as indicated by a two-dot chain line, and the cylinder rod 12 is slid upward by driving the air cylinder mechanism 10. As a result, the tire support roller 14 contacts the circumferential surface of the tire 5 and presses the tire 5 toward the top of the roller 1. In this way, the tire 5 is supported by the pair of tire support rollers 14 and is positioned on the top of the roller 1 as indicated by a solid line. Thereafter, the vehicle under test 3 is fixed to the floor 8 or the like, the cylinder rod 12 is slid downward by the air cylinder mechanism 10, the tire support roller 14 is separated from the tire 5, and the roller 1 is rotated by driving the tire 5, A performance test of the vehicle under test 3 is performed.
JP 2004-85498 A JP-A-6-201525

  In the vehicle centering device of the conventional chassis dynamometer described above, when the vehicle is centered, for example, as shown in FIG. 3A, as shown in FIG. 3B, the up switch 23a and the down switch 23b When the lift switch 23a is pressed, the cylinder rod 12 of the air cylinder mechanism 10 is raised until it is fully extended, and when the drop switch 23b is pressed, the air cylinder mechanism 10 is lowered until it is retracted to the maximum. Therefore, these operations are performed regardless of the diameter of the tire 5 of the vehicle under test 3, and cannot cope with the change in the diameter of the tire 5. Although it is conceivable to use a motor (actuator) mechanism with a position control function such as an encoder, such a mechanism is expensive and requires maintenance due to contamination.

  The present invention has been made to solve the above problems, and can easily cope with a change in the diameter of the tire of the drive wheel of the vehicle under test, and is inexpensive and requires little maintenance. The object is to obtain a vehicle centering device for a chassis dynamometer.

  According to a first aspect of the present invention, there is provided a vehicle centering device for a chassis dynamometer, in which a tire of a driving wheel of a vehicle under test is placed on a roller, and the power of the tire is driven and absorbed by a dynamometer connected to the roller. In a chassis dynamometer that performs vehicle performance tests, a cylinder mechanism that is installed in front of and behind a roller and is slidable in the direction of the top of the roller, a movable bracket attached to a cylinder rod on which the cylinder mechanism slides, and a movable bracket A tire support roller that is supported and presses the tire of the driving wheel of the vehicle under test from the front and rear when the cylinder rod is raised, and the center of the front and rear direction of the tire is positioned directly above the rotation shaft of the roller, and the fixed side of the cylinder mechanism Fixed side bracket attached to the motor, and attached to the fixed side bracket and operated to expand and contract by motor drive The stopper is attached to the movable side bracket, and is engaged with the stopper operating portion when the cylinder rod is raised to stop the cylinder rod ascending, and the stopper operating portion corresponds to the tire diameter of the vehicle under test. And an operation switch for controlling the motor so as to be in a corresponding position or an origin position.

  The chassis dynamometer vehicle centering device according to claim 2 sets the position of the operating portion of the stopper to the position corresponding to the tire diameter of the vehicle under test using a timer that sets the driving time of the motor.

  As described above, according to the first aspect of the present invention, the tire support roller for centering the tire of the vehicle under test is attached to the movable side bracket of the cylinder mechanism, and the motor is driven to extend and contract by the fixed side bracket of the cylinder mechanism. A stopper having a portion is attached, and a locking portion is provided on the movable side bracket to stop the cylinder rod from rising when the cylinder rod is raised, and the stopper working portion is a tire of the vehicle under test. An operation switch that controls the motor is provided so as to be in the position corresponding to the diameter or the origin position, and the position of the operating portion of the stopper can be set according to the tire diameter, and the locking portion is provided in the operating portion. Since the cylinder rod stops when it is locked, the stop position of the cylinder rod can be determined according to the change in the tire diameter of the vehicle under test. Come, it is possible to easily cope with a change in the tire diameter. In addition, since a motor mechanism with a position control function such as an encoder is not used, the cost is low, the contamination does not occur much, and maintenance is easy.

  According to the second aspect of the present invention, the setting of the operation portion of the stopper to the position corresponding to the tire diameter of the vehicle under test is performed by the timer that sets the driving time of the motor. Therefore, it is easy to change the tire diameter. If the tire diameter selection is changed many times, an error may occur in the timer. In such a case, the error can be easily corrected by returning the stopper operating portion to the origin. .

  The best mode for carrying out the present invention will be described below with reference to the drawings. FIG. 1 (a) is a front view of an essential part of a vehicle senling device for a chassis dynamometer according to the best mode for carrying out the present invention. However, for convenience of explanation, only one will be explained. The fixed side of the pair of air cylinder mechanisms 10 is attached to the fixed side bracket 15, and the tip of the projecting portion 15 a from the fixed side bracket 15 is, for example, a roller below the floor 8, that is, below the top of the roller 1 in FIG. 1 is attached to a support column 9 provided before and after 1. Therefore, each air cylinder mechanism 10 is disposed obliquely upward. A movable side bracket 13 is attached to the movable side of the pair of air cylinder mechanisms 10, that is, the sliding cylinder rod 12 side, and a tire support roller 14 is rotatably attached between the pair of protrusions 13 a from the movable side bracket 13. It is done.

  One end of a stopper support shaft 16 is attached to the movable side bracket 13, the stopper support shaft 16 is slidably inserted into the fixed side bracket 15, and a locking portion 17 is attached to the other end of the stopper support shaft 16. It is done. On the other hand, a motor 18 is attached to the fixed bracket 15 via a support portion 15 b, and a stopper 20 is connected to the motor 18 via a gear head 19. Reference numeral 20 a denotes an operating portion of the stopper 20 that expands and contracts when the motor 18 is driven. FIG. 1B shows the operation switches of the stopper 20 and the air cylinder mechanism, 21a is an operation switch for returning the operating portion 20a of the stopper 20 to the origin, and 21b to 21d are small diameters of the tire 5 of the vehicle under test 3. In the middle, large and large cases, an operation switch 21e is an operation switch for "raising (extending)" the tire support roller 14 during centering, and 21f is an operation switch for "lowering" the tire support roller 14. Further, the motor 18 is provided with a control unit 22 that controls the motor 18 in response to the operation of each operation switch 21a to 21d, and the control unit 22 has a timer. The rotation speed of the motor 18 is 1500 / min, the reduction ratio 1/9 of the gear head 19, the full stroke 100 mm of the operating portion 20a of the stopper 20, and the advance distance of the operating portion 20a per one rotation of the input shaft of the stopper 20 is 0.8mm. The full stroke of the cylinder rod 12 is 150 mm.

  Next, the operation of the above configuration will be described. First, the control power of the centering device is turned on, and the operating portion 20a of the stopper 20 is returned to the origin by driving the motor 18 (actually, it returns after 3 seconds). Next, any one of the operation switches 21b to 21d is pressed, and the tire diameter is selected according to the tire diameter of the vehicle under test 3. When the tire diameter is selected, the motor 18 is driven for the driving time set in the timer of the control unit 22 according to this, and the operating part 20a of the stopper 20 extends from the origin to a predetermined position according to the selected tire diameter. Here, when the “up” operation switch 21 e is pressed, the pair of front and rear tire support rollers 14 are moved from below the floor 8 through the opening 8 a of the floor 8 via the cylinder rod 12 and the movable bracket 13 of the air cylinder mechanism 10. The pair of front and rear tire support rollers 14 press the circumferential surface of the tire 5 to position the center of the tire 5 in the front-rear direction directly above the center line of the roller 1 and perform a centering operation. . At this time, the stopper support shaft 16 also rises together with the movable bracket 13, the locking portion 17 comes into contact with the operating portion 20a of the stopper 20 at a position corresponding to the tire diameter, and the rise of the tire support roller 14 stops. Therefore, a centering operation corresponding to the tire diameter is performed. When an operation switch that does not correspond to the tire diameter of the vehicle under test 3 is selected, the “down” operation switch 21f is pressed to temporarily lower the tire support roller 14, and the operation switch 21b corresponding to the tire diameter. Press ~ 21d. Even when the centering operation is finished, the "down" operation switch 21f is pressed to lower the cylinder rod 12 of the air cylinder mechanism 10 and lower the tire support roller 14 so as not to obstruct the running test of the vehicle under test 3. . The operation switches 21b to 21d blink when the motor 18 starts to be driven by pressing, and light up when the position of the operating portion 20a of the stopper 20 is determined.

  As described above, the stopper 20 corresponding to the diameter of the tire 5 of the vehicle under test 3 is set by the timer, which will be further described. The rotation speed of the input shaft of the stopper 20 is reduced by the gear head 19 to 1500/9 = 166 / min, and the rotation speed of the full stroke of the stopper 20 is 100 mm / 0.8 mm = 125 rotations. (125/166) × 60 = 45 seconds. Therefore, if the diameter of the tire 5 is φ800, the stroke of the cylinder rod 12 of the air cylinder mechanism 10 in this case is 125 mm, and the stroke from the origin of the operating portion 20a of the stopper 20 is 52 mm. The operating time is 23 seconds. If the tire diameter is φ650, and the stroke of the cylinder rod 12 is 145 mm and the stroke from the origin of the operating portion 20a is 32 mm, the operating time of the jack portion 20 is 14 seconds. If the tire diameter is 500 mm, and the stroke of the cylinder rod 12 is 150 mm and the stroke from the origin of the operating portion 20a is 27 mm, the operation time of the stopper 20 is 12 seconds. Accordingly, if such a driving time is set by a timer and the stopper 20 is driven by the motor 18 for the set time, the position of the operating portion 20a of the stopper 20 is set corresponding to the tire diameter, and the operating portion 20a If the stop 17 is locked, the stroke of the cylinder rod 12 can be set according to the diameter of the tire 5 of the vehicle under test 3.

  According to the above-described best embodiment, the operation switches 21a to 21d for controlling the motor 18 are provided so that the operating portion 20a of the stopper 20 is at a position corresponding to the diameter of the tire 5 of the vehicle under test 3 or the origin position. Therefore, when the locking portion 17 that rises together with the cylinder rod 12 is locked with the operating portion 20a when the cylinder rod 12 is raised, the raising of the cylinder rod 12 is stopped, and the tire support roller 14 is also attached to the tire 5 of the vehicle under test 3. It stops at the position corresponding to the diameter. For this reason, it is possible to easily cope with a change in the diameter of the tire 5. In addition, since a motor mechanism with a position control function such as an encoder is not used, the cost is low, the contamination does not occur much, and maintenance is easy.

  In addition, since the setting of the operation portion 20a of the stopper 20 to the position corresponding to the diameter of the tire 5 is performed by the timer for setting the driving time of the motor 18, the setting change of the tire diameter from “small” to “medium” To change the setting from “large” to “small”, it is only necessary to change the difference in the set time of the timer, and the tire diameter selection can be easily changed. In addition, if the diameter of the tire 5 is selected and changed many times, an error may occur in the timer. In such a case, the operating portion 20a of the stopper 20 is returned to the original position by pressing the operation switch 21a. Thus, the error can be corrected.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of a principal part of a vehicle senling device for a chassis dynamometer and a front view of operation switches of a stopper and an air cylinder mechanism according to the best embodiment of the present invention; It is the top view and longitudinal cross-sectional front view of the vehicle centering apparatus of the conventional chassis dynamometer shown by patent document 1. FIG. It is the front view of the longitudinal section of the vehicle centering apparatus of the conventional chassis dynamometer shown by patent document 2, and the front view of the operation switch of an air cylinder mechanism.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Roller 2 ... Dynamometer 3 ... Vehicle under test 4 ... Drive wheel 5 ... Tire 9 ... Strut 10 ... Air cylinder mechanism 12 ... Cylinder rod 13 ... Movable side bracket 14 ... Tire support roller 15 ... Fixed side bracket 17 ... Locking Part 18: Motor 20 ... Stopper 20a ... Actuator 21a to 21f ... Operation switch 22 ... Control part

Claims (2)

  In a chassis dynamometer that places the tire of the drive wheel of the vehicle under test on a roller and drives and absorbs the power of the tire with a dynamometer connected to the roller to test the performance of the vehicle under test. The cylinder mechanism is slidable in the top direction of the roller, the movable bracket is attached to the cylinder rod on which the cylinder mechanism slides, and the tire on the driving wheel of the vehicle under test is supported by the movable bracket and is raised by the cylinder rod. A tire support roller that presses from the front and rear to position the center in the front and rear direction of the tire directly above the rotation shaft of the roller, a fixed bracket that is attached to the fixed side of the cylinder mechanism, and a motor that is attached to the fixed bracket. A stopper with an operating part that expands and contracts by driving, and is mounted on the movable bracket and mounted on the cylinder rod. An operation to control the motor so that the stopper actuating part is positioned at the position corresponding to the tire diameter of the vehicle under test or the origin position, and the stopper actuating part is sometimes engaged with the actuating part of the stopper to stop the raising of each cylinder rod. A vehicle centering device for a chassis dynamometer comprising a switch. 2. The vehicle centering device for a chassis dynamometer according to claim 1, wherein the operation portion of the stopper is set to a position corresponding to the tire diameter of the vehicle under test by a timer for setting a driving time of the motor.

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