JP5293484B2 - Wheel centering device for vehicle performance test equipment - Google Patents

Abstract

A conventional centering device using a contact (pressure) sensor causes a variation in the position of detection due to the material of wheels, air pressure, etc. A wheel centering device (1) is provided with: a pair of front and rear rollers (2, 2) arranged in front of and behind a vertical line passing through the axis of a single-shaft drum (103) of a chassis dynamometer; a pair of front and rear electrically driven cylinders (5, 6) having the rollers (2) mounted to the tips of rods (4) by means of roller holders (3); drive wheel detection sensors (7) mounted to the roller holders (3) together with the rollers (2) and detecting a drive wheel (102) of a vehicle to be tested; and a control device for controlling the drive of the pair of front and rear electrically driven cylinders (5, 6). Photoelectric sensors are used as the drive wheel detection sensors (7).

Description

  The present invention relates to a vehicle performance test apparatus such as a chassis dynamometer for performing various performance tests on a test vehicle by placing the drive wheels of a test vehicle on a uniaxial drum (hereinafter referred to as a drum) and rotating the drive wheels with the drum. The present invention relates to a wheel centering device for placing a driving wheel of a test vehicle directly above the drum.

  In the chassis dynamometer, in order to accurately test the test vehicle, the drive wheel of the test vehicle is directly above the drum, that is, the line connecting the rotation center of the drive wheel and the rotation center of the drum is vertical. It is necessary to arrange so that. The wheel centering device meets the above requirements.

  As shown in FIGS. 7 to 9, as the wheel centering device 101, a pair of front and rear rollers 104, 105 as positioning members disposed before and after a vertical line VL passing through the axis of the drum 103 on which the driving wheel 102 of the test vehicle is placed. When the driving mechanisms 106 and 107 that move the pair of rollers 104 and 105 in the front-rear direction to press the driving wheel and the rollers 104 and 105 and the driving wheel 102 come into contact with each other with a predetermined pressure, A contact sensor (not shown) that outputs a contact signal indicating the effect, a position sensor (not shown) that detects the positions of the rollers 104 and 105, and the drive mechanisms 106 and 107 to control the rollers 104 and 105. Between the operating position where the axis of the driving wheel 102 can be positioned on the vertical line VL and the non-operating position where it does not contact the driving wheel 102 A control mechanism 108 for moving the, features, the above-described control mechanism 108, the position obtained from the position sensor at a time when the contact signal is outputted has a configuration to set as the operating position.

  As shown in FIG. 8, the wheel centering device 101 is configured such that the driving wheel 102 contacts the peripheral surface of the drum 103 and the peripheral portion of the drum opening 110 on the pit cover surface (vehicle traveling floor surface) 109. In addition, the motors of the drive mechanisms 106 and 107 are driven to slide the pair of rollers 104 and 105 toward the drive wheel 102.

  When one of the rollers 105 close to the drive wheel 102 (the rear of the drive wheel) comes into contact with the drive wheel 102, the load on the motor increases, and the current supplied to the motor increases. The contact sensor detects that the roller 105 has contacted the driving wheel 102 by detecting that the supply current has become a predetermined value or more, and outputs a contact signal.

  The drive wheel 102 moves toward the top of the drum 103 as one roller 105 in contact with the drive wheel 102 slides.

  As shown in FIG. 9, when the driving wheel 102 reaches the top of the drum 103, the other roller 104 (front of the driving wheel) also contacts the other side of the driving wheel 102 to support the driving wheel 102. . At this time, the contact sensor on the other side also detects contact and outputs a contact signal. When contact signals are output from both the contact sensor on the roller 104 side and the contact sensor on the roller 105 side, the sliding of the rollers 104 and 105 is stopped, and the centering operation is completed. (See, for example, paragraphs 0042 to 0046 and paragraphs 0061 to 0065 of Patent Document 1).

JP 2005-233668 A

  In the conventional wheel centering device, as described above, the driving wheel 102 is moved to the top of the drum 103 by one roller 105, and the driving wheel 102 detects the contact sensor on the other roller 104 side. The driving wheel 102 is detected by the contact sensor depending on the material of the driving wheel 102, whether it is studless, or whether the air pressure is high, because the centering is performed by detecting the pressing with a predetermined contact pressure. There is a problem that a difference may occur in the detection position.

The object of the present invention is to accurately detect the position of the outer peripheral edge of the drive wheel regardless of the material of the drive wheel, air pressure, etc. , and to retract the roller when the roller is stored in the pit after the centering is completed. Another object of the present invention is to provide a wheel centering device capable of automatically closing a roller opening provided on a pit cover surface with a lid .

According to a first aspect of the present invention, a test vehicle is tested by placing a driving wheel of a test vehicle on the top of the drum with the top of the drum disposed in the pit facing the opening provided on the pit cover surface. In the performance test apparatus, a wheel centering device for centering the driving wheel on the top of the drum, a pair of front and rear rollers arranged before and after a vertical line passing through the axis of the drum, and a roller by a roller holder A pair of front and rear electric cylinders attached to the tip of the rod, a drive wheel detection sensor that is attached to the roller holder together with the roller and detects a drive wheel, and a control device that controls the driving of the pair of front and rear electric cylinders; in the wheel centering device for Bei example, vehicle testing apparatus using a photoelectric sensor to the drive wheel detecting sensor,
A lid plate for closing a part of the opening provided in the pit cover when the roller was housed in the pit was attached to the tip of the roller holder.

According to a second aspect of the present invention, in the wheel centering device of the first aspect, the pair of front and rear electric cylinders are mounted in the pit by a cylinder holding member capable of adjusting an inclination angle of the rod with respect to the pit cover surface.
According to a third aspect of the present invention, in the wheel centering device of the first or second aspect, the photoelectric sensor is arranged in a substantially horizontal direction along with the roller along the pit cover surface on the roller holder.
According to a fourth aspect of the present invention, in the wheel centering device according to the first or second aspect, the photoelectric sensor is arranged in series in the moving direction of the rod in the roller holder on the tip side of the rod from the roller.

Since the wheel centering device of the present invention uses a photoelectric sensor as the drive wheel detection sensor, the edge position of the outer peripheral end of the drive wheel can be accurately detected regardless of the material of the drive wheel, air pressure, and the like. In particular, if the rod is raised during centering, the lid rises with the raising of the rod, automatically opening the roller opening on the pit cover surface, and lowering the rod after centering is completed. By storing the roller in the pit, the opening portion for the roller can be automatically closed by the lid.

The front view which shows schematic structure of the wheel centering apparatus of this invention. FIG. The same side view. The enlarged view of the principal part of FIG. The flowchart which shows the effect | action of the wheel centering apparatus of this invention. Explanatory drawing of the other Example of the wheel centering apparatus of this invention. The top view of the wheel centering apparatus of a prior art example. Explanatory drawing which shows the effect | action of the wheel centering apparatus of a prior art example. Explanatory drawing which shows the effect | action of the wheel centering apparatus of a prior art example.

  1 is a front view showing a schematic configuration of a wheel centering device of the present invention, FIG. 2 is a plan view thereof, FIG. 3 is a side view thereof, and FIG. 4 is an enlarged view of a main part of FIG.

  As shown in FIG. 1, the wheel centering device 1 causes the top of a uniaxial drum (hereinafter referred to as a drum) 103 disposed in a pit to be exposed to the outside from a drum opening 110 on a pit cover surface 109. It is used in a chassis dynamometer that mounts driving wheels 102 of a test vehicle on the top of 103 and tests the test vehicle.

  The wheel centering device 1 includes a pair of front and rear rollers 2 and 2 disposed in front of and behind a vertical line VL passing through the axis of the drum 103, and a pair of front and rear motors in which the roller 2 is attached to the tip of a rod 4 by a roller holder 3. A cylinder 5, 6, a drive wheel detection sensor 7 that is attached to the roller holder 3 together with the roller 2 and detects the drive wheel 102, and a control device that controls driving of the pair of front and rear electric cylinders 5 and 6 Omitted). A photoelectric sensor is used as the driving wheel detection sensor 7.

  The pair of front and rear electric cylinders 5 and 6 are arranged at both ends of the rotating shaft 14 in the axis (length) direction by rotating the rotating shaft 14 via the sprocket 12 and the chain belt 13 by the motor 11. The pair of left and right motion converters 15 and 15 convert the rotational motion of the rotary shaft 14 into the straight motion of the pair of left and right rods 4 and 4. A ball screw, a ball nut, or the like is used for the motion conversion device 15. The rod 3 moves vertically with respect to the pit cover surface 109 at a predetermined inclination angle θ, for example, 35 °.

  As shown in FIGS. 2 and 3, the ends of the pair of left and right rods 4 and 4 of the pair of front and rear electric cylinders 5 and 6 are connected by the roller holder 3. The roller holder 3 includes a connecting portion 21 that connects the distal ends of the pair of left and right rods 4 and 4, and a pair of roller support arm portions 22 and 23 provided at both ends of the connecting portion 21. The roller 2 is rotatably mounted between the pair of roller support arm portions 22 and 23.

  A photoelectric sensor 7 serving as the drive wheel detection sensor is disposed in the vicinity of the roller 2 on the roller support arm portions 22 and 23.

  The photoelectric sensor 7 includes a light emitting element 7a attached to the inner surface of one roller support arm portion 22, and a light receiving element 7b attached to the inner surface of the other roller support arm portion 23 so as to face the light emitting element 7a. When the driving wheel 102 enters between the light emitting element 7a and the light receiving element 7b, the detection light emitted from the light emitting element 7a is blocked by the driving wheel 102 and the driving wheel 102 is detected.

  As shown in an enlarged view in FIG. 4, the tip end of the roller holder 3, that is, the tip ends of the roller support arm portions 22 and 23 are formed horizontally so as to be parallel to the pit cover surface 109. A cover plate 24 that closes a part of the drum opening 110 when the roller 2 is housed in the pit is attached to the tips of the roller support arm portions 22 and 23. In addition, the roller 2 and the photoelectric sensor 7 are arranged in the horizontal direction at the tip of the roller holder 3, and the roller 2 moves to the driving wheel 102 almost simultaneously with the detection of the driving wheel 102 by the photoelectric sensor 7. It comes to contact.

  The roller holder 3 is guided to move up and down by the movement guide member 25. The roller holder 3 is provided with a limit switch operating body 27 via an arm 26.

  1, when the roller holder 3 moves to the lower limit position (movement reference position), the lower limit switch 28 is pressed by the switch operating body 27 and the roller holder 3 is moved to the lower limit position (movement reference position). ) Is detected. Further, as shown by a two-dot chain line in FIG. 1, when the roller holder 3 is moved to the upper limit position, the upper limit switch 29 is pressed by the switch operating body 27, and it is detected that the roller holder 3 is at the upper limit position. Then, further movement of the roller holder 3 is prevented. The pair of front and rear electric cylinders 5 and 6 are mounted in the pit by a cylinder holding member 30 so that the inclination angle θ of the rod 4 with respect to the pit cover surface 109 can be adjusted.

  Next, the operation of the wheel centering device 1 will be described. First, the driving wheel 102 of the test vehicle is placed between the drum 103 of the chassis dynamometer and the peripheral portion of the drum opening 110 on the pit cover surface 109. Next, the roller holder 3 is lowered by the pair of front and rear electric cylinders 5 and 6, and the lower limit switch 28 is pressed by the switch operating body 27 to detect the lower limit position serving as the reference position.

  When the lower limit position is detected, the rods 4 of the pair of front and rear electric cylinders 5 and 6 are raised. When the rods 4 of the pair of electric cylinders 5 and 6 are raised, it is almost the same as detecting the driving wheel 102 by one of the electric cylinders close to the driving wheel 102, that is, the photoelectric sensor 7 of the electric cylinder 6 on the rear side of the driving wheel 102. At the same time, the roller 2 comes into contact with the drive wheel 102.

  Further, when the rods 4 of the pair of front and rear electric cylinders 5 and 6 are raised, the roller is substantially simultaneously with the other electric cylinder, that is, the photoelectric sensor 7 of the electric cylinder 5 on the front side of the driving wheel 102 detects the driving wheel 102. 2 is brought into contact with the drive wheel 102 for centering.

  Even after the centering is completed, the rods 4, the rod holders 3 and the rollers 2 of the pair of front and rear electric cylinders 5 and 6 are further raised so that the drive wheels 102 do not float from the drum 103, so that the drive wheels 102 Crimp to the drum 103 with load pressure. Then, the rollers 2 are rotated to control the attitude of the drive wheels 102 and the test vehicle. Whether or not the driving wheel 102 is lifted from the drum 103 is detected by a pressure sensor (not shown). Since the pair of front and rear electric cylinders 5 and 6 are separately assembled and fixed in the pits, an assembly error is inevitably generated between them. Then, a stroke deviation of the rod 4 may occur due to an error in the assembly position. In such a case, the deviation of the stroke of the rod 4 of the pair of front and rear electric cylinders 5 and 6 is calculated and corrected so that the stroke of the rod 4 of the pair of front and rear electric cylinders 5 and 6 becomes the same. FIG. 5 is a flowchart showing an example of the operation of the wheel centering device 1, and 31 is an operation panel.

  FIG. 6 shows another embodiment of the wheel centering device 1 of the present invention. In this embodiment, the photoelectric sensor 7 located on the front side of the drive wheel 102 is arranged in the rod holder 3 in series in the slide direction of the rod 4 so as to be located on the tip side of the rod holder 3 relative to the roller 2. Has been. A time difference is provided between the detection of the driving wheel 102 by the photoelectric sensor 7 and the contact of the roller 2 with the driving wheel 102, and after detecting the driving wheel 102 by the photoelectric sensor 7, the roller 2 is moved to the driving wheel 102 after a predetermined time. Can be contacted. Other configurations and functions and effects are the same as those in the above-described basic embodiment, and thus redundant description is omitted.

  In the above embodiment, the wheel centering device of the present invention has been described by taking as an example the case where the driving wheel of the test vehicle is centered on the single-axis drum in the chassis dynamometer. This is used when centering driving wheels of a vehicle.

DESCRIPTION OF SYMBOLS 1 ... Wheel centering apparatus 2 ... Roller 3 ... Roller holder 4 ... Rod 5, 6 ... Electric cylinder 7 ... Photoelectric sensor (drive wheel detection sensor)
7a ... Light emitting element 7b ... Light receiving element 102 ... Driving wheel 109 ... Pit cover surface 110 ... Opening

Claims (4)

A pair of front and rear rollers disposed before and after a vertical line passing through the axis of the uniaxial drum facing the outside from an opening provided in the pit cover, and a pair of front and rear electric cylinders attached to the tip of the rod by a roller holder; A driving wheel detection sensor that is attached to the roller holder together with the roller and detects a driving wheel, and a control device that controls driving of the pair of front and rear electric cylinders, and a photoelectric sensor is used as the driving wheel detection sensor. In the wheel centering device of the vehicle performance test device used ,
A wheel centering device for a vehicle performance test apparatus, wherein a lid plate for closing a part of an opening provided in the pit cover when the roller is housed in a pit is attached to a tip of the roller holder . The wheel centering device for a vehicle performance test apparatus according to claim 1, wherein the pair of front and rear electric cylinders are attached to the pit by a cylinder holding member capable of adjusting an inclination angle of the rod with respect to a pit cover surface. . The wheel centering of the vehicle performance test apparatus according to claim 1 or 2 , wherein the photoelectric sensor is arranged in the roller holder in a substantially horizontal direction along with the roller along the pit cover surface. apparatus. 3. The vehicle performance test apparatus according to claim 1, wherein the photoelectric sensor is arranged on the roller holder, arranged in series in the moving direction of the rod on the tip end side of the rod with respect to the roller. Wheel centering device.

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