JPS6150251B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a testing machine for measuring the rolling resistance of an automobile tire by rolling the tire on a roller connected to a dynamometer.

Prior Art Conventionally, as a means for measuring the rolling resistance of an automobile tire, a method using a dynamometer and a method using a load cell as described in Japanese Patent Application Laid-Open No. 52-65584 are known.

When using a dynamometer, the dynamometer is connected to a roller, and the test tire is placed on the roller so that it can roll freely, and the roller is driven to rotate the test tire to increase its rolling resistance. Test (i.e. measure on the roller side). On the other hand, in the tire testing machine disclosed in Japanese Patent Application Laid-Open No. 52-65584, the test tire is placed on a drum driven by a motor, and the support shaft of the test tire is swingable. The rolling resistance is measured by a load cell for measuring rolling resistance that is supported by a supported bearing frame and connected to the bearing frame.

In both the measurement method using a load cell disclosed in JP-A-52-65584 and the measurement method using a dynamometer, the loss of the bearings of the shaft supporting the tire and the shaft supporting the roller is measured. It is not possible to accurately measure the rolling resistance of a tire unless it is subtracted from Therefore, in the tire test disclosed in JP-A No. 52-65584, the tire support shaft is supported by freely supported inner and outer bearing members, and the outer bearing member is used to provide rolling resistance of the tire. A load cell for measurement is connected to the inner bearing member, and a load cell for measuring bearing loss is connected to the inner bearing member.

Problems to be Solved by the Invention However, in a tire testing machine using a dynamometer, the rolling resistance of a tire cannot be accurately measured unless losses in both the tire support shaft and the roller support shaft are subtracted. However, since the conventional roller support shaft is simply a general bearing device, that is, the rotary shaft is supported by a bearing arranged on a fixed bearing stand, the test tire is placed on the roller with a predetermined load. When the bearing is loaded and rolled, the resistance acting on the bearing due to the load causes errors in measuring rolling resistance.

Means for Solving the Problems The present invention has a dynamometer connected to the roller,
In a tire testing machine that measures the rolling resistance of a tire by placing the tire on the roller and rolling it while applying a load, the tire has a tire support shaft that supports the test tire at a predetermined height above the base. The tire support shaft is supported by a swinging frame supported by the tire support frame by a hydraulic floating field, and an arm extending laterally from the swinging frame is connected to a load cell. The roller support shaft on which the test tire is mounted and rolled is rotatably supported by a swinging frame supported by electric double bearings operated by a motor, and an arm extending laterally from the swinging frame. It is characterized by being connected to a load cell.

Function: By rotating the roller using a dynamometer, the tire mounted on the roller in a freely rolling manner is rotated, and the rolling resistance of the tire is measured using the dynamometer. At this time, the loss in the bearing of the tire support shaft is measured with a load cell connected to the swing frame that supports the support shaft, and the loss in the bearing of the roller support shaft is measured with a load cell connected to the swing frame that supports the support shaft. Measurement is performed using a load cell connected to a swinging frame.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Since the overall configuration is shown in Figures 1 and 2,
First, this will be explained. In the figure, 1 is a base installed on the floor, each member is arranged on the base, 2 is a frame support mechanism, 3 is a feed screw rising from the frame support mechanism 2, and 4 is a predetermined interval. A tire support frame has one end pivotally supported by a shaft 5 at the upper ends of the two feed screws 3 arranged at a distance from each other. Reference numeral 6 designates a dummy weight attached to the tip of the tire support frame 4.

Reference numeral 7 denotes a tire to be tested supported by the tire support frame 4, and is fitted to a tire mounting wheel 8a attached to one end of a tire support shaft 8. This tire support shaft 8 passes through the tire support frame 4 in the lateral direction. 9 is a support mechanism that supports the other end of the tire support frame 4 whose one end is supported by the shaft 5, 10 is a load control cylinder installed on the base 1, and 11 is fixed to the upper end of the rod 10a. The support frame 13 is a load detection load cell attached to the support frame 11 in a suspended state via a pin 15, and the lower end of the load cell 13 is attached to the shaft 14.
It is connected to the tire support frame 4 by. Therefore, the front end side of the tire support frame 4 is connected to the load control cylinder 1 via the load cell 13.
It is in a state where it is suspended and supported by 0.

12a and 12b are double rollers for supporting the tire, with 12a being the drive side and 12b being the free side. The shaft 12a' of the drive roller 12a is directly connected to a DC electric dynamometer 16, and is driven by this. Each roller 12a, 12b is connected to a swinging frame 17.
a, 17b, and each swing frame 17
Arms 18a, 18b protrude from the sides of a, 17b. Each arm 18a, 18b is connected to a load cell 21 via a shaft 19 and a connecting fitting 20. Therefore, when the rollers 12a and 12b rotate in contact with the tire 7, the load cell 21 detects the loss that the roller bearings receive.

The general structure of the present invention is as described above, and the tire 7 is rotated in contact with the rollers 12a and 12b,
The rolling resistance is measured using an electric dynamometer 16 as a specific example of a dynamometer directly connected to the drive-side roller 12a. This will be explained in detail with reference to the following.

First, with reference to FIG. 3, the tire support frame 4
To explain the support mechanism 2 on one end side, the lower ends of two feed screws 3, 3 standing upright at a predetermined interval are mounted on a bearing stand 22 provided at the top of the base 1 to receive a load. Thrust bearing 2
3 and is supported by a bearing 24 for receiving rotation, and its upper part is supported by a support frame 2.
It is supported by a bearing 27 on a bearing pedestal 26 provided in a part of 5 so as not to tilt.

Inside the support frame 25, sprockets 28 are pivotally attached to the lower portions of the left and right feed screws 3, 3, and a chain 29 is stretched between them. A sprocket 30 connected to the drive side is further pivoted to one of the feed screws 3, and the sprocket 31 is pivoted to the drive shaft of a geared motor 31 for driving the feed screw disposed at the end of the base 1.
A chain 32 is stretched between the a and the a. Therefore, the left and right feed screws 3, 3 can be synchronously rotated in forward and reverse directions by the geared motor 31. A screw receiver 33 is screwed into each feed screw, and a support base 34 is fixed to this with bolts and nuts.

A pillow block 35 is installed on the support stand 34, and both ends of the shaft 5 are pivotally supported on this. One end of the tire support frame 4 described above is pivotally supported on the shaft 5 . Note that 36 is a cap fixed to the upper end of the feed screw 3, and when the screw receiver 33 comes into contact with this cap, the ascent is prevented and the ascent limit is regulated. On the other hand, an adjustment screw 37 protrudes from the upper surface of the support frame 25 so as to be able to move forward and backward, and when the support base 34 is lowered, it is configured to hit this and prevent the lowering. In addition, 38a and 38b are the support frame 2
When the screw receiver 33 is raised or lowered to a predetermined height position by the operating rod of the limit switch provided on the support plate 70 attached to the side end of the bracket 33a, the bracket 33a protruding from the lever operates the operating rods 38a and 38b. This causes the limit switch to move to the support base 34.
The height position of the geared motor 31 is detected and the geared motor 31 is stopped.

By having the frame support mechanism 2 configured as described above, the tire support frame 4 can support tires 7 having different diameters, and the roller 12 can support tires 7 having different diameters.
When testing the rolling resistance by placing the shaft 5 on the supports 34a and 12b, the geared motor 31 rotates the feed screws 3, 3 in the forward and reverse directions, and the shaft 5 is supported on the support base 34.
The tires 7 having different diameters are raised and lowered, and the tire support frame 4 is moved up and down accordingly.
The test can be carried out smoothly by bringing the rollers into contact with the rollers 12a and 12b.

Next, a bearing device for the tire support shaft 8 supported by the support frame 4 will be explained with reference to FIGS. 1, 2, and 4. In the figure, both ends of the tire support shaft 8 are supported by a swing frame 41 through bearings 39 and 40, and the swing frame 41 is supported by the tire support frame 4 by hydraulic levitation. More specifically, a tire attachment boss 8b is attached to one end of the tire support shaft 8, a tire attachment wheel 8a is attached to this, and the tire 7 is fitted onto the attachment wheel 8a. An air supply hole 42 is provided at the center of the tire support shaft 8.
is drilled, and the tip of the supply hole 42 is connected to the supply hole 4 drilled in the mounting boss 8b and the mounting wheel 8a.
It communicates with the inside of the tire 7 via 2a. Further, the base end of the supply hole 42 opens at one end of the tire support shaft 8, and is connected to an air hose 44 by a rotary joint 43 at the one end. Therefore, while testing the tire 7 by rotating it at high speed, the air pressure of the tire can be freely varied, and the rolling resistance of the tire can be measured while the air pressure is changed.

On the other hand, a swing frame 41 that supports the tire support shaft 8 via bearings 39 and 40 is supported by hydraulic levitation on a ring seat 45 that is supported and fixed to the tire support frame 4 side. That is, the ring seat 45 is attached to the flanges 41a, 41 at both ends of the swing frame 41.
located in the concave portion formed by a, and the surface in contact with the peripheral surface of the swing frame 41 and the flange edges 41a, 41
An annular pressure oil pool 45 is provided on each surface in contact with a.
a, 45b are formed, and pressure oil is supplied to these parts. For this reason, the ring seat 45 has oil holes 45 connected to each pressure oil pool 45a, 45b.
c, 45d are formed, and these oil holes 45
Reference numerals c and 45d denote oil supply holes 48 and 48, which are respectively opened in a thick wall portion 4a provided on the tire support frame 4 to support the ring seat 45 and a pressure oil supply block 47 disposed outside the thick wall portion 4a. It communicates with... An oil supply hose 49 is connected to the outer end of the oil supply hole 48a of the block 47, and the pressure oil supplied through this is branched in the block 47 and then passes through each oil hole to the above-mentioned pressure oil. The oil is supplied to oil pools 45a and 45b.

Therefore, when oil is pressurized into the pressure oil pools 45a, 45b, the adjacent contact surfaces 45e, 45
An oil film is formed on f..., and the swing frame 41 is supported by the tire support frame 4 by hydraulic levitation with almost no loss due to resistance. A torque detection arm 50 extends laterally from the outer peripheral wall of the swing frame 41, and is shown in FIGS.
As can be seen from the figures, the tip of the torque detection arm 50 is connected to a load cell 51 attached to the tire support frame 4. That is, as can be seen from the above figures, a part of the tire support frame 4, that is, a part that supports the tire support shaft 8, is a drum-shaped part 4b, and the swing frame 41 is connected to the drum-shaped part 4b on the inside thereof. It is configured to pivotally support the tire support shaft 8, and for this purpose, a window hole 52 is formed in the drum-shaped portion 4b, and the torque detection arm 50 attached to the swing frame 41 is inserted through the window hole 52 and extends outward. It protrudes and is connected to the load cell 51 attached to the support frame 4.

Therefore, the load cell 51 is connected to the tire support shaft 8
This is to detect the bearing loss caused by the bearings 39 and 40. In other words, this bearing loss appears as a rotational force that attempts to swing the swinging frame 41, so this is measured by the load cell 51. In this case, the swing frame 41 itself naturally has resistance loss due to the member supporting it, that is, the ring seat 45, but in order to reduce this as much as possible, the most effective hydraulic pressure is used as described above. It was a levitation method. Note that 53 shown in FIGS. 1 and 4 is a drain pipe for oil leaking from the pressure oil pool.

Next, the support mechanism 9 on the other end side of the tire support frame 4 shown in FIGS. 1, 5, and 6 will be explained. The schematic structure of this has already been explained, but as can be seen from each figure, the tire support frame 4 is connected to the support shaft 1.
4, and by operating the load detection cylinder 10 to move the rod 10a up and down, the tire load applied to the rollers 12a and 12b can be adjusted from 0 to 0.
It can be varied within the range of 1000Kg. For example, if the weight of the tire support frame 4 is 1000 kg, if the cylinder 10 lifts 40 kg, the test can be performed with the load applied to the tire being 600 kg. The dummy weight 6 attached to the end of the tire support frame 4 may be increased arbitrarily if the weight is insufficient. Note that 55 is a reinforcing member provided on the tire support frame 4 to reinforce the support shaft 14, and 54 is an electric member that controls the load by supplying and discharging pressure oil to the cylinder 10. It is a hydraulic servo valve.

Next, a shaft support device for the double rollers 12a and 12b that rotate while supporting the tire 7 will be explained with reference to FIGS. 1 and 7 to 9. This bearing device also needs to be configured to have as little bearing loss as possible, and the bearing loss must be separately detected and subtracted from the rolling resistance of the tire. For this reason, the bearing device is an electric double bearing, and bearing loss is detected by a load cell via a swing frame. That is, each roller 1
Both ends of the roller shafts 12a', 12b' of 2a, 12b are supported by swing frames 17a, 17b by bearings 56, and swing frames 17a, 17b are supported by electric double bearings 58. In the electric double bearing 58, the inner ring 57 of the outer bearing 57
a and the outer ring 59a of the inner bearing 59 are provided in pressure contact, and the inner ring 57a
is connected to the gear 62 by a bolt 60 and a presser plate 61 so as to rotate integrally with the outer ring 59.
a is positioned by the inner edge of the gear 62 and the press plate 61. Further, the outer ring 57b of the outer bearing 57 is fixed by a bearing stand 63a, a bearing frame 63b, and a presser cover 64, and the inner bearing 59
The inner ring 59b is in contact with and supports the swinging frames 17a and 17b. The bearing frame 63b and the presser cover 64 are fixed with bolts 65.

The gear 62 is rotated by a motor 66 attached to a bearing stand 63a and a bearing frame 63b. That is, as can be seen from FIG. 9, the bearing stand 63a is the base 1.
The gear 66a of the above-mentioned motor 66 attached thereto meshes with the gear 67.
A gear 68 is further coaxially attached to the gear 67, and this gear 68 meshes with the gear 62 that rotates the inner ring 57a of the aforementioned outer bearing 57.

Therefore, according to the electric double bearing 58,
When the rollers 12a, 12b rotate, the swing frames 17a, 17b swing via the bearings 56 that pivotally support the roller shafts 12a', 12b', but these bearings are electric double bearings. motor 66
As a result, the inner ring 57a of the outer bearing 57 and the outer ring 59a of the inner bearing 59 are connected to the swing frame 17.
Since the swing frames 17a and 17b are always rotating in the swinging direction, the resistance applied to the inner bearing 59 due to the swinging of the swing frames 17a and 17b is almost canceled out, and the swing frame remains in a state where the resistance is close to zero. can be made to oscillate.

As shown in FIGS. 1, 2, 7, etc., the swing frames 17a, 17b are provided so as to surround each roller 12a, 12b with a part of the outer periphery remaining. An arm 18a extending laterally is provided on the outer peripheral wall of each of the surrounding swing frames.
18b is attached, and this arm is connected to the load cell 21 via a connecting fitting 20 connected by a support shaft 19.
is connected to. Therefore, the rollers 12a,
When 12b rotates, the roller support shafts 12a', 12
The resistance due to the bearing part 56 of b' is the resistance of the swinging frame 17
Since this appears as a rotational force that attempts to oscillate the a and 17b, this is detected by the load cell 21 and subtracted during the test. Since the bearings of the swing frames 17a and 17b are supported, the bearing loss of the swing frames themselves can be reduced to an almost negligible level, and only the losses of the bearings of the swing frames 17a and 17b can be detected. In addition, 69
A and 69b are balance plates attached to the swinging frames 17a and 17b, and are provided at positions opposite to the arms 18a and 18b, so that the weight of the arms is canceled out and the swinging frames are balanced. It is designed to be maintained in this state. Also,
70 is a spirit level attached to the tire support frame 4.

Effects of the Invention According to the tire testing machine according to the present invention, when testing and measuring the rolling resistance of a test tire that is rotatably mounted on a roller while driving the roller with a dynamometer connected to the roller, the roller is supported. The mechanical loss of each shaft and tire support shaft can be measured moment by moment through each load cell connected to each swing frame that supports each support shaft, and this loss can be measured and measured using a dynamometer. By subtracting it from the measured value, only the pure rolling resistance of the tire can be accurately measured. In this way, the present invention is equipped with a means for measuring the loss of the tire support shaft and roller support shaft when measuring the rolling resistance of the tire on the roller side, so it is possible to more accurately measure the rolling resistance of the tire using a dynamometer. is now possible.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention, in which Fig. 1 is a front view, Fig. 2 is a plan view, Fig. 3 is a cross-sectional explanatory view showing a support mechanism at one end of the tire support frame, and Fig. 4 is a tire support shaft. 5th sectional view showing the support mechanism of
Figure 6 is a sectional view and front view showing the support mechanism at the other end of the tire support frame, Figure 7 is an enlarged sectional view showing the tire support roller and its related components, and Figure 8 is an enlarged sectional view showing the tire support roller and its related components.
FIG. 7 is a side view with some parts omitted, and FIG. 9 is a cross-sectional view of an electric double bearing for supporting a swing frame that supports a roller support shaft. DESCRIPTION OF SYMBOLS 1...Base, 2...Support mechanism on one end side of tire support frame, 4...Tire support frame, 7
... Tire, 8 ... Tire support shaft, 9 ... Support mechanism for the other end of the tire support frame, 10 ... Cylinder, 12a, 12b ... Roller, 12a', 1
2b'...Roller shaft, 13, 21, 51...Load cell, 18a, 18b, 50...Arm, 33...
...screw receiver, 17a, 17b, 41...swing frame, 57...electric double bearing.

Claims (1)

[Claims] 1 In a tire testing machine in which a dynamometer is connected to a roller and a tire is placed on the roller and rolled while applying a load to measure the rolling resistance of the tire, the tire support shaft that supports the test tire is used as the base. The tire support shaft is supported by a swinging frame supported by the tire support frame by a hydraulic floating field, and extends laterally from the swinging frame. The arm is connected to a load cell, and the support shaft of the roller on which the test tire is mounted and rotates is supported by a swinging frame supported by an electric double bearing operated by a motor, and A tire testing machine for measuring rolling resistance that features a side-extending arm connected to a load cell.