JPH0450633A - Cover device for tow-type tire rolling resistance measuring truck - Google Patents

Abstract

PURPOSE:To improve the measuring accuracy of tire rolling resistance by towing a truck with a towing vehicle which is independent of tow-type tire rolling resistance measuring truck. CONSTITUTION:An aerodynamic cover part 21 covers the entire upper and surrounding parts of a tow-type tire rolling resistance measuring truck 20. The measuring truck 20 and the cover device are independently linked to a towing bracket 51 of a towing vehicle 50, respectively. A tractive-force measuring part 55 for measuring the tractive force of the towing vehicle 50 for the measuring truck 20 is provided in the bracket 51. The measuring part 55 is attached to, e.g. the towing bracket 51 so that the measuring part can be moved back and forth. A moving member 56 having a pivot part 53 at the upper end part, a load sensor 57 which is butted to the moving member 56 in the back and forth directions and receives the load from the moving member 56 and the like are provided. The signal corresponding to the tractive force is outputted.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a cover device for a towed tire rolling resistance measuring truck that prevents the towed tire rolling resistance measuring truck from being subjected to air resistance.

(Prior Art) Conventionally, when measuring the rolling resistance of a tire, a method has been adopted in which, for example, a tire testing machine (drum type, flat belt type, etc.) is used as a measuring device indoors, and the resistance component is measured. There is. In addition, when measuring tire rolling resistance on an actual vehicle, μ, W (rolling resistance bone) is 10 μ by the coasting method.

Rolling resistance coefficient μ by regression to V2 (air resistance bone)
4, or by attaching a road wheel type 6-component force meter or road wheel torque meter to the axle and measuring the driving resistance when running at a constant speed. That is, a traction-type tire rolling resistance measuring device was not used, and there was no cover device for it.

Note that a towed ski/do-nanpa measuring device is known as a tire-related measuring device, but since this applies a large braking force to the wheels and the influence of aerodynamics can be almost ignored, an aerodynamic cover is not provided. Not yet.

(Problems to be Solved by the Invention) However, the conventional tire resistance measuring device described above can only measure tire rolling resistance indirectly, making it difficult to measure tire rolling resistance with high precision. .

On the other hand, measurement using a towed tire rolling resistance measuring device (hereinafter referred to as a towed tire rolling resistance measuring trolley) can be considered, but in this case, the tire rolling resistance is small (for example, the rolling resistance coefficient μ, # 0.015
), as the vehicle speed increases, the air resistance of the tires and measuring device reaches a level that cannot be ignored, making it impossible to obtain accurate measurements.

The present invention was made in view of such conventional problems, and it covers a towed tire rolling resistance measuring cart with an aerodynamic cover, and prevents the air resistance of the aerodynamic cover from affecting the measuring cart, so that the tire rolling resistance can be measured without affecting the measuring cart. The purpose is to improve the measurement accuracy of rolling resistance.

(Means for Solving the Problems) The invention according to claim 1 includes: an aerodynamic cover portion that covers a towed tire rolling resistance measurement cart; wheels that support the cover portion;
The invention as set forth in claim 2 is characterized in that the aerodynamic cover portion has a substantially circumferential lower end portion that is towed by a towing vehicle independently of the towed tire rolling resistance measuring trolley. The invention according to claim 3 is characterized in that a rubber member close to the road surface is provided between the aerodynamic cover part and the towed tire rolling resistance measurement trolley side, with the rubber member being provided in the vicinity of the towing point of the towing vehicle. A stopper mechanism is provided which is activated by the relative pendulum movement of the two, and the stopper mechanism prevents the aerodynamic cover portion from contacting the towed tire rolling resistance measuring trolley with impact. The invention according to claim 4 is characterized in that the pendulum movement of the towed tire rolling resistance measurement trolley accompanying the pendulum movement of the aerodynamic cover portion is detected immediately before the operation of the stopper mechanism, and the detection signal is transmitted to the towed vehicle. It is characterized by being equipped with a pendulum motion detection means that outputs an output to an on-board measuring device.

(Function) In the invention of claim 1, no air resistance is applied to the measuring cart, and furthermore, air resistance of the aerodynamic cover part does not affect the measuring cart. Therefore, tire rolling resistance can be measured independently and directly, improving measurement accuracy.

In the invention as set forth in claim 2, the rubber member restricts the inflow and outflow of air between the road surface and the lower end of the aerodynamic cover. Therefore, aerodynamic resistance to the tractable tire rolling resistance measurement trolley is almost completely eliminated, and measurement accuracy is further improved.

In the invention as set forth in claim 3, when the aerodynamic cover portion and the towed tire rolling resistance measuring cart side make a relative pendulum movement around the towing point of the towing vehicle, the stopper mechanism prevents contact between the two with an impact. be done.

In the invention according to claim 4, the limit switch
Immediately before the stopper mechanism is actuated, the pendulum movement of the measuring cart accompanying the pendulum movement of the aerodynamic cover portion is detected, and a detection signal thereof is output to an on-vehicle measuring device mounted on the towing vehicle. Therefore, it is possible to separate the measurement data during the pendulum movement from other data, thereby increasing the reliability of the measurement data.

(Example) Hereinafter, the present invention will be explained based on the drawings.

1 to 5 are diagrams showing an embodiment of the invention according to claims 1 to 4.

In FIG. 1, reference numeral 11 denotes a cover device, and this cover device 11 includes a traction portion 12, a frame member 13, an outer plate 14, a rubber member 15, and a pair of left and right wheels 16.

The towing part 12 is a part for towing the cover assembly 211 by a towing vehicle 50, which will be described later, and the towing part 12 is formed with, for example, a spherical recess 12a that opens downward. The frame member 13 and the outer plate 14 are coupled to each other to form an aerodynamic cover portion 21 as shown, and this aerodynamic cover portion 21 is supported by a pair of wheels 16. Further, the rubber member 15 is a flexible member provided on the substantially circumferential lower end 21a of the aerodynamic cover part 21 so as to be close to the road surface S, and prevents air from entering and exiting at the lower end of the aerodynamic cover part 21. It is designed to be restricted.

As shown in FIG. 2.3, the aerodynamic cover part 21 covers the entire upper part and surrounding area of the towed tire rolling resistance measuring cart 20, and the measuring cart 20 and the cover device 11 each independently cover the towed tire rolling resistance measuring cart 20. 50 towing brackets 51
is connected to. Specifically, the towing bracket 51
The upper and lower pivot parts 52 are located at the same point on the horizontal road surface (their center points coincide in plane coordinates).
．． 53, the traction part 12 of the cover device 11 is swingably connected to the pivot part 52, and the traction part 22 of the tractable tire rolling resistance measuring cart 20 is swingably connected to the pivot part 53. Further, this towing bracket 51 is provided with a traction force measuring section 55 that measures the traction force of the measurement cart 20 by the towing vehicle 50. The traction force measurement unit 55 is attached to, for example, the traction bracket 51 so as to be able to swing back and forth, and collides with a swinging member 56 having the pivot portion 53 at its upper end in the front-back direction. It has a load sensor 5, etc. that receives a load from the swinging member 56, and outputs a signal corresponding to the traction force.

In addition, in FIG. 2.3, 24 is the frame of the tractable tire rolling resistance measuring trolley 20, and 25 is this measuring trolley 20.
26 is a beam axle that pivotally supports the left and right wheels W on which tires to be measured are mounted, and 27 is a damper member interposed between the frame 24 and the beam axle 26.

Here, the beam axle 26 extends approximately the same distance from the pivot portion 52.53 as the axis of the wheel 16.
It is located behind 53. Further, 28 is an inertia brake mechanism. The inertia brake mechanism 28 includes a lever 29 which is supported by the traction part 22 at its base end so as to be swingable back and forth, and which is rotatably and slidably connected to the frame 24 of the measuring cart 20 at its intermediate part. A brake cable 30 is connected to the swinging end of the lever 29. For example, when the towing vehicle 50 decelerates, the lever 29 is caused to swing forward by the inertia of the measuring cart 20 between the frame 24 and the towing section 22. , a known brake device (not shown) is operated via the brake cable 30.

Further, as shown in FIG. 4, the entire outer plate 14a of the aerodynamic cover portion 21 is removably attached to the frame member 13 with a plurality of screws 17, and the left and right front outer plates 14b can be opened and closed by rotating the tip side. It is possible (two-page spread is possible),
Thereby, with the measurement cart 20 connected to the towing vehicle 50, the aerodynamic cover portion 21 can be advanced from behind and connected to the towing vehicle 50.

On the other hand, as shown in FIG. 5, a stopper mechanism 41 is provided between the aerodynamic cover section 21 and the towed tire rolling resistance measuring cart 20. This stopper mechanism 41 includes an elastic body 42.43 that collides with each other when the aerodynamic cover section 21 and the measuring cart 20 make a relative pendulum movement about a pivot section 52.53 that is a towing point of the towing vehicle 50. , these elastic bodies 42 and 43 are connected to the aerodynamic cover section 21 and the measuring trolley 2.
0 support member 44.45 and elastic body 42.4
30 and a shim 46 for varying the normal gap. That is, the stopper mechanism 41 operates when the measurement cart 20 and the aerodynamic cover part 21 make the pendulum movement, and prevents them from coming into contact with each other due to the pendulum movement. Further, a limit switch 48 is attached to the support member 44 via a bucket 47, and a bracket 49 for operating the limit switch 48 is attached to the support member 45. This stop switch 48 is operated by a bracket 49 immediately before the stopper mechanism 41 is activated, and the stop switch 48 is operated by a bracket 49 to
It is a pendulum motion detection means for detecting the pendulum motion of the aerodynamic cover part 21 accompanying the pendulum motion of the pendulum, and outputs the detection signal to an on-vehicle measuring device (not shown) mounted on the towing vehicle 50. ing.

In FIG. 2.3.5, 61 is a lamp that is attached to the top or rear surface of the aerodynamic cover part 21 and is lit in conjunction with the stop lamp of the towing vehicle 50, and 62 is its wiring.

Next, the effect will be explained.

First, a wheel W on which a tire to be measured is mounted is attached to a traction type tire rolling resistance measurement trolley 20, and a traction section 22 of this measurement trolley 20 is connected to a pivot section 53 of a towing vehicle 50. Next, the cover W11 with the outer plates 14a and 14b opened in advance is advanced from the rear of the measuring cart 20 toward the towing vehicle 50, and the towing part 12 is moved to the pivot part 5.
2, the outer panels 14a and 14b are closed. In this state, the towing vehicle 50 starts traveling. At this time, no air resistance is applied to the measurement cart 20 in front of the aerodynamic cover portion 21, and the air resistance of the aerodynamic cover portion 21 also does not affect the measurement cart 20. Therefore, it is possible to directly measure tire rolling resistance alone, with air resistance components removed, and measurement accuracy is improved. In addition, rubber member 1
5 restricts the inflow and outflow of air between the road surface and the lower end of the aerodynamic cover part 21, and the aerodynamic resistance to the towed tire rolling resistance measurement cart 20 is almost completely eliminated, thereby further improving measurement accuracy.

On the other hand, when a cross wind input is applied to the cover device 11, for example, the aerodynamic cover portion 21 and the towed tire rolling resistance measurement trolley 20
and makes a pendulum movement about the pivot portion 52, 53 (towing point) of the towing vehicle 50. Specifically, first, the aerodynamic cover part 21 makes a pendulum movement from side to side about the traction part 12 due to the action of the cross wind, and when this collides with the measurement cart 20, the measurement cart 20 also makes a pendulum movement. At this time, an angular difference between the direction of the tire to be measured and its traveling direction, a so-called slip angle, occurs in the tire, and the measuring device calculates a value that is the sum of the original tire rolling resistance and the tire dragging resistance caused by the slip angle. is measured as tire rolling resistance. To solve these problems, the elastic bodies 42 and 43 of the stopper mechanism 41 abut against each other, thereby preventing contact between the two that would cause an impact. In addition, the limit switch 48
, the pendulum movement of the measurement cart 20 accompanying the pendulum movement of the aerodynamic cover part 21 is detected immediately before the stopper mechanism 41 is actuated, and the detection signal is output to the on-vehicle measurement device mounted on the towing vehicle 50. The on-vehicle measurement device separates the measurement data during the pendulum movement from other data. Therefore, reliability of measurement data is increased.

(Effects) According to the invention described in claim 1, the air resistance component applied to the tractable tire rolling resistance measuring trolley is removed9, tire rolling resistance can be directly measured independently, and tire rolling resistance can be measured independently. Measurement accuracy can be improved.

According to the second aspect of the invention, it is possible to restrict the inflow and outflow of air in the gap between the aerodynamic cover portion and the road surface, thereby almost completely eliminating the aerodynamic resistance, thereby further improving measurement accuracy.

According to the third aspect of the invention, it is possible to prevent the aerodynamic cover portion and the measurement cart from making contact with each other due to impact due to relative pendulum movement.

According to the invention set forth in claim 4, the pendulum motion of the measurement cart that may cause a slip angle in the tire is detected, and the measurement data during the pendulum motion is separated from other data to improve the reliability of the measurement data. be able to.

[Brief explanation of drawings]

Figures 1 to 5 show an embodiment of a cover device for a traction type tire rolling resistance measuring trolley according to the present invention. Figure 1 is a perspective view thereof, and Figure 2 is an aerodynamic cover portion and a traction type tire. Schematic plan view, with rolling resistance measurement trolley. Fig. 3 is a side view of the main part showing its usage condition, Fig. 4 is a front plan view of the aerodynamic cover part, and Fig. 5 shows the aerodynamic cover part and the towed tire rolling resistance measurement trolley showing the vicinity of the stopper mechanism. FIG. 11... Cover device, 12... Traction unit, 15... Rubber member, 16... Wheel, 20... Traction type tire rolling resistance measuring trolley,
21...Aerodynamic cover part, 41...Stopper mechanism, 48...Limit switch (pendulum motion detection means) 52.53...Pivot part (traction point ).

Claims (4)

[Claims] (1) An aerodynamic cover part that covers a towed tire rolling resistance measurement trolley and wheels that support the cover part, and is towed by a towing vehicle independently of the towed tire rolling resistance measurement trolley. A cover device for a towed tire rolling resistance measuring trolley, characterized by: (2) Claim 1 characterized in that a rubber member close to the road surface is provided at a substantially circumferential lower end portion of the aerodynamic cover portion.
A cover device for the described towed tire rolling resistance measuring trolley. (3) A stopper mechanism is provided between the aerodynamic cover portion and the towed tire rolling resistance measuring cart, and the stopper mechanism is operated by relative pendulum movement between the two around the towing point of the towed vehicle, and the stopper mechanism allows the aerodynamic 3. The cover device for a traction type tire rolling resistance measuring cart according to claim 1 or 2, wherein the cover device is configured to prevent occurrence of impact-causing contact between the cover portion and the traction type tire rolling resistance measuring cart. (4) Immediately before the stopper mechanism is actuated, detect the pendulum movement of the towed tire rolling resistance measurement trolley due to the pendulum movement of the aerodynamic cover, and send the detection signal to an on-vehicle measuring device mounted on the tow vehicle. 4. The cover device for a towed tire rolling resistance measuring cart according to claim 3, further comprising pendulum motion detection means for outputting an output.