JPH0645235Y2 - Tire fixing device - Google Patents

Description

[Detailed Description of the Invention] A. Field of Industrial Application The present invention relates to a tire fixing device.

B. Outline of the Invention This invention relates to a tire fixing device which is attached to a chassis dynamometer and used for fixing a vehicle under test, and the relative position of the stopper and the belt-shaped member can be changed in the tire axial direction. Thus, the device can be applied to tires having various tread widths.

C. Conventional technology A chassis dynamometer is a device used for power performance tests of vehicles. The chassis dynamometer is for simulating various running states by placing an arbitrary load on the rollers while driving the vehicle by mounting the driving wheels in a roller shape.

11 and 12 show the schematic configuration of the chassis dynamometer in side view and plane view, respectively. In these figures, a pair of left and right rollers 2 and 3 are rotatably supported by a support base 4 below the floor surface 1. The rollers 2 and 3 are connected to a load device (not shown) including a gearbox, a flywheel device, and a dynamometer. A driving wheel (rear wheel) 6 of a vehicle under test (hereinafter referred to as vehicle) 5 is placed on the rollers 2 and 3, and the driving wheels 6 drive the rollers 2 and 3 or the rollers 2 and 3 operate. The driving wheels 6 are driven to simulate the running state.

By the way, a longitudinal force due to a driving reaction force is applied to the vehicle body 7 of the vehicle 5 during the test. Therefore, the chassis dynamometer is provided with means for fixing the vehicle body 7 at a predetermined position, and the vehicle body fixing means in the illustrated example is a tire fixing device 10 for fixing the tire 9 of the driven wheel (front wheel) 8.

The tire fixing device 10 includes triangular pillar-shaped tire receivers 11 and 12 arranged in the front-rear direction on the floor surface 1 and a belt (or chain) 13 which is a belt-shaped member hung between the tire receivers 11 and 12.
It consists of The rear end of the belt 13 is fixed to the rear tire bridge 12 and the front end thereof is wound up inside the front tire bridge 11. The tread surface 9a of the tire 9 contacts the slopes of the front and rear tire bridges 11 and 12. They are in contact with each other, and are further fixed by being tightly bound to the tire receivers 11 and 12 by a belt 13 wound around the tread surface 9a. Further, a stopper 14 that comes into contact with the sidewall surface 9b of the tire 9 is integrally attached to the front tire receiver 11 and holds the driven wheel 8 so as not to move or rotate left and right. This stopper 14 is particularly necessary when the driven wheel 8 is a front wheel, that is, a steering wheel, because it often rotates carelessly due to vibration during a test.

As shown in FIG. 13, the tire receivers 11 and 12 are slidably attached to a pair of front and rear bases 15 provided on the floor surface 1 in the left-right direction, and the tread of the vehicle 5 (hereinafter, wheel distance). Has been adapted to. In addition, the base 15 itself moves in the front-rear direction on a pair of left and right rails 16 provided on the floor surface 1, so that the vehicle 5
It can also be applied to the wheel base (hereinafter, axle distance) and the outer diameter of the tire 9.

D. Problems to be Solved by the Invention The conventional tire fixing device 10 has the following problems because the relative positions of the tire receivers 11 and 12, that is, the stopper 14 and the belt 13 are constant. That is, since the tire receivers 11 and 12 and the belt 13 cannot move relative to each other in the left-right direction, the belt 13 may not reach the center of the tire 9 depending on the tread width of the tire 9. Particularly in recent years, an increasing number of vehicles are equipped with flat radial tires 9'having a wide tread width. In this case, as shown by the two-dot chain line in FIG. 13, the belt 13 is provided at the end of the tread surface 9a. It was sometimes wrapped around.

As a result, the belt 13 may come off the tire 9 due to vibration of the vehicle body during the test, and the vehicle 5 may vibrate greatly, resulting in a decrease in test accuracy, or the vehicle 5 may sometimes jump out of the chassis dynamometer and damage the test equipment. There was also something.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a tire fixing device capable of reliably fixing various tires having different tread widths.

E. Means for Solving the Problem Therefore, in order to solve this problem, the present invention provides a tire receiver that contacts the tread surface of the tire of the vehicle under test, a stopper that contacts the sidewall surface of the tire, and A tire fixing device having a belt-shaped member for binding and fixing the tire to the tire receiver is provided with a tire width adjusting device for changing the relative position of the stopper and the belt-shaped member in the axial direction of the tire.

F. Action In the tire fixing device according to the present invention, the belt width adjusting device moves the belt-shaped member or the stopper in the left-right direction with respect to the tire receiver. As a result, the belt-shaped member can be positioned at the center or substantially the center of the tread surface of the tire according to the tread width of the tire.

G. Examples Hereinafter, three examples of the tire fixing device to which the present invention is applied will be specifically described with reference to the drawings. In the description of the embodiments, the same members as those in the above-described conventional example are designated by the same reference numerals, and duplicated description will be omitted.

The first and second embodiments move the belt, which is a belt-shaped member, with respect to the stopper integrated with the tire receiver, and the third embodiment, conversely, moves the stopper with respect to the tire receiver. The tire receivers in these embodiments are front parts, but the rear part has a similar structure, and therefore the description thereof is omitted. Further, although all of these examples are applied to the tire fixing device in the chassis dynamometer, they may be applied to other test devices.

First Embodiment FIG. 1, FIG. 2, and FIG. 3 show the entire first embodiment in side view,
The plan view and the back view are respectively shown, and FIG. 4 shows the main part (enlarged cross section of part A in FIG. 3).

1 to 3, a front tire receiver 11 has a bottom plate 18 on which a slider 17 whose main body is fitted to a guide portion 15a of a base 15 is attached to the front and rear surfaces, and a tread surface 9 of a tire 9.
Rectangular contact plate 19 that abuts on a, inner plate forming left and right side surfaces
20 and the outer plate 21. The outer plate 21
A stopper portion 21a that abuts against the sidewall surface 9b of the tire 9 is integrally formed on the rear side thereof.

A ratchet handle 22 is attached to the side surface of the outer plate 21, and the wind shaft 23 is rotated by operating the ratchet handle 22, and the belt 13 is wound. In the figure, 24 is the ratchet handle 22.
Is a claw lever attached to the side surface of the claw lever and engages with a claw wheel 25 at the end of the wind shaft 23 to transmit the driving force. Further, 26 is a spring plunger that pushes the claw lever 24 against the ratchet wheel 25, and 27 is a ratchet wheel stopper that prevents the ratchet wheel 25 from reversing.

As shown in FIG. 4, the wind shaft 23 has a bush 28.
It is held slidably with respect to the inner and outer plates 20, 21 via. A ratchet wheel 25 is bolted to the right end of the wind shaft, and a washer 29 is bolted to the left end. A compression coil spring (hereinafter, spring) 30 is interposed between the bush 28 and the washer 29 on the inner plate 20 side.
The spring 30 biases the wind shaft 23 inward. In the figure, 31 is a belt retainer that regulates the lateral position of the belt 13, 32 is a bush 28 and a spring 30.
It is a thrust washer for reducing the frictional resistance between them.

Next, the operation of this embodiment will be described.

When the tire fixing device 10 is aligned, first the vehicle 5
The base 15 is moved on the rail 16 or the tire receivers 11 and 12 are moved on the base 15 in accordance with the tire 9 of FIG. Next, when the tread width of the tire 9 is different from the predetermined one, the wind shaft 23 is moved to the outside as shown in FIG. In this state, a gap is created between the ratchet wheel 25 and the bush 28 on the side of the outer plate 21, but in this embodiment, the liner 33 is inserted into this gap to prevent the wind shaft 23 from returning due to the spring force of the spring 30. As a result, the belt 13 moves relative to the tire receiver together with the wind shaft 23, and the centers of the tire 9 and the belt 13 can be aligned.

As shown in FIG. 6, the liner 33 in this embodiment is
Is a disk-shaped object provided with a notch 33a into which the wind shaft 23 is inserted, and a bolt hole 33b for fixing to the outer plate 21 is formed in a part thereof. Further, a plurality of liners 33 having different thicknesses are prepared so that they can be adapted to various tires 9 having different tread widths.

The procedure described above is for the front part, but the rear part is adjusted similarly.

Second Embodiment FIG. 7 shows an enlarged cross section of the main part of the second embodiment. This embodiment has substantially the same structure as that of the first embodiment, and is different only in the vicinity of the inner end portion of the wind shaft. Therefore, only that part will be described.

In the figure, 34 is a hollow cylindrical ring bolt having an external thread formed on its outer peripheral surface, and is integrated with the inner plate 20 by welding. Ring nut 35 for ring bolt 34
Are screwed together. The ring nut 3 is composed of a cylindrical portion 35a having an internal thread formed on its inner surface and a disk portion 35b forming an end surface. The outer peripheral surface of the cylindrical portion 35a is knurled and the center of the disk portion 35b is punched. The hole 35c is formed.

On the other hand, the left end of the wind shaft 23 has a stepped bolt shape, and the washer 29 is fitted to the stepped portion, and the nut 36 prevents the dropout. The washer 29 is rotatable with respect to the wind shaft 23. A spring 30 and a thrust washer 32 are interposed between the washer 29 and the bush 28 to urge the wind shaft 23 to the left in the figure, as in the first embodiment. In the figure, 37 is a detent integrated with the thrust washer 32 and isher 29.
The washer 29 is prevented from rotating carelessly by fitting into the hole formed in the.

In this embodiment, the belt 13 or the wind shaft
To move 23, first, the operator manually rotates the ring nut 35. Then, the disk portion 35b pushes the washer 29 to the right in the drawing as the ring nut 35 is screwed. Washer 2
Since 9 is fitted to the step portion of the wind shaft 23 as described above, this force is transmitted to the wind shaft 23 and moves it. At this time, washers 29 and thrust washers
Since the detent 32 is integrated in the rotation direction by the detent 37, the spring 30 is not twisted. still,
In this embodiment, the liner used in the first embodiment is of course unnecessary. Third Embodiment FIGS. 8 and 9 show the side surface of the third embodiment and the BB cross section in FIG. 8, respectively. , FIG. 10 shows a perspective view of the stopper plate.

As shown in FIGS. 8 and 9, the tire receiver 11 of this embodiment is on the fixed side of the belt 13. The structure of the main body is the same as that of the first embodiment described above, the bottom plate 18, the inner and outer plates 20, 21, and the contact plate 1
9, the attachment of the contact plate 19 is not directly to the side plates 20 and 21, but to the two front plates 38. Further, the outer plate 21 has no stopper portion. 2 front plates 38
A spacer 39 is interposed between the upper and lower sides to form a gap, and a pair of upper and lower locking pins 40 are attached to the gap.

In the figure, reference numeral 41 denotes a stopper plate, which is formed of a locking portion 42 inserted between the front plates and a stopper portion 43 welded to the locking portion 42 so as to be L-shaped. . In addition to the groove 42a through which the locking pin 40 passes, the locking portion 42 is formed with a locking hole 42a into which the locking pin 40 is fitted.

The operation of this embodiment will be described below.

In the above-described two embodiments, the belt 13 is moved in order to adapt the tire fixing device 10 to the tread width of the tire 9, but in this embodiment, this is done by moving the stopper plate 41. First, the tire receiver 11 is moved to a predetermined position in order to match the axial distance and the wheel distance. At this time, the stopper plate 41 is removed from the tire receiver 11. Next, the stopper plate 41 is inserted into the gap between the front plates 38, and the ninth plate
The locking hole 42b is fitted into the locking pin 40 as shown in the figure.
In this embodiment, three sets of the locking holes 42b are formed,
The position of the stopper plate 41 in the left-right direction can be set in three ways, and can correspond to various tread widths.

Incidentally, in this embodiment, four or more sets of the locking holes 42b may be formed, or the moving mechanism of the stopper plate 41 may utilize screw advancement.

H. Effect of the Invention According to the tire fixing device of the present invention, since the relative position of the stopper and the belt-shaped member can be changed in the axial direction of the tire, the tire can be securely fixed during the test of the vehicle under test. It is possible to improve the accuracy and prevent the vehicle under test from jumping out.

[Brief description of drawings]

1 to 6 relate to a first embodiment of the present invention,
2 and 3 are a side view, a plan view, and a rear view, respectively, showing the entire tire receiver, FIG. 4 is an enlarged cross-sectional view of a portion A in FIG. 3, and FIG. 5 and FIG. It is an operation explanatory view of a 1st example, and a perspective view of a spacer. FIG. 7 is an enlarged sectional view of a main part of a tire receiver according to a second embodiment of the present invention. Fig. 8 ~
FIG. 10 is a side view of a tire receiver, a BB sectional view in FIG. 8 and a perspective view of a stopper plate according to a third embodiment of the present invention. 11 and 12 are a side view and a plan view of a chassis dynamometer to which a conventional tire fixing device is attached, respectively, and FIG. 13 is a plan view of a tire fixing portion in the conventional device. In the figure, 5 is a vehicle under test, 9 is a tire, 9a is a tread surface, 9b is a sidewall surface, 10 is a tire fixing device, 11,12 is a tire receiver, 13 is a belt (belt member), 21 is an outer plate, 21a is a stopper portion, 23 is a wind shaft, 29 is a washer, 30 is a spring, 33 is a liner, 34 is a ring bolt, 35 is a ring nut, and 41 is a stopper plate.

Claims (1)

[Scope of utility model registration request] 1. A tire having a tire receiver that abuts a tread surface of a tire of a vehicle under test, a stopper that abuts a sidewall surface of the tire, and a belt-shaped member that binds and fixes the tire to the tire receiver. A tire fixing device comprising a tire width adjusting device for changing a relative position of the stopper and the belt-shaped member in an axial direction of the tire in the fixing device.