JP2012122938A - Tire tread receiving device of tire testing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tire tread receiving device of a tire testing machine capable of providing a flat pseudo road surface with zero slip angle as a substitute for the known drum type and belt type tire testing machine.SOLUTION: Multiple belt-like plates 9 are connected to loop-like connecting means (chain) 8a and 8b laid across around left/right wheels 7 and 6 to form a loop shape, and the upper surface of the belt-like plates 9 located in the upper part are formed into a flat pseudo road surface F with a prescribed length where the measuring object tire comes into contact. The tire tread receiving device further includes: lateral deviation preventing means 11 of the pseudo road surface A comprising a roller 11d, on both side faces of the pseudo road surface A; and support means 10 comprising a roller 10r supporting the lower face of the belt-like plates 9 from the lower side of the pseudo road surface A.

Description

  The present invention relates to a tire testing machine for measuring tire performance of automobile tires.

  In general, a tire testing machine sets a tire combined with a wheel on a test stand and measures cornering performance, uniformity, rolling resistance, unit noise, durability, and the like.

  Conventional tire testing machines employ a drum system that receives a tire load with a rotating drum or a belt system that receives a tire load with a belt.

  However, in a drum type tire testing machine, the surface is not flat but round, and the ground contact length of the tire is different from that of a flat road surface in normal driving. Further, there is a problem in that the lateral force (corner stiffness) per slip angle varies depending on the curvature of the drum.

  On the other hand, a belt-type tire testing machine can obtain a flat road surface, but there is a problem that the belt bends due to the load of the test tire.

  Therefore, as a test surface of a tire testing machine that can support the load of the test tire and constitute a flat test road surface, the test stand of the tire testing machine is hung on a rotating drum, two driven rollers, the rotating drum, and the driven roller. There is an example of a tire testing device that is formed with a passed endless belt or endless track, and the test tire is configured to abut against the endless belt and to support the load of the test tire with the rotating drum (for example, (See Patent Document 1).

JP 2005-83812 A

  However, the tire test apparatus of Patent Document 1 also requires a device that prevents the belt from coming off because the belt in contact with the tire is pushed out by the lateral force generated by the tire.

  Further, since the belt constantly meanders while maintaining a certain balance with the lateral force, a true slip angle cannot be determined.

  Therefore, there is no problem with accuracy when testing with a large slip angle, but the required measurement accuracy cannot be obtained for cornering stiffness and uniformity measurements that need to be measured with a small slip angle. was there.

  That is, the belt generally runs meandering between 0.05 degrees and 0.1 degrees. The meandering of the slip angle of 0.05 degrees to 0.1 degrees means that the slip angle accuracy and the measurement system are 5 to 10%.

  In addition, there is a problem that the tire uniformity cannot be obtained with a testing machine using a meandering flat belt.

  The present invention eliminates the above-mentioned problems that occur in conventional drum-type and belt-type tire testing machines, makes it possible to accurately measure uniformity, particularly price tear and conicity, and to easily perform forward and reverse rotation. An object of the present invention is to provide a tire tread receiving device for a tire testing machine that can be used for

  In order to achieve this object, the present invention connects a large number of belt-like plates to loop-like connecting means that spans the left and right wheels, and the tire to be measured comes into contact with the upper surface of the belt-like plate located above. A lateral slip prevention means for preventing lateral displacement of the simulated road surface was provided at both side edges of the simulated road surface while being formed on the simulated road surface having a flat length.

  According to the present invention, since the road surface has the same flat pseudo road surface as that of the normal road surface and the lateral displacement of the road surface is prevented, zero slip angle can be realized, tire uniformity, in particular, price tear and conicity can be accurately measured, and the pseudo road surface It is possible to provide a tire tread receiving device for a tire testing machine that can easily perform forward and reverse rotation.

It is a front view of the tire testing machine of Example 1 of the present invention. It is a side view of the tire testing machine. It is a top view of this tire testing machine. It is front sectional drawing of the location of the tire tread receiving apparatus of this tire testing machine. FIG. 5 is a cross-sectional view taken along line XX in FIG. 4. FIG. 5 is a cross-sectional view taken along line YY in FIG. 4.

  The example of the form for carrying out the present invention is shown below.

  Example 1 of a tire testing machine having a tire tread receiving device of the present invention will be described with reference to the drawings.

  FIG. 1 is a front view of the tire testing machine of Example 1, FIG. 2 is a side view of the tire testing machine 1, and FIG. 3 is a plan view of the tire testing machine 1.

  The tire testing machine 1 includes a tire tread receiving device 2, a tire shaft support device 3, and a frame 4. The frame 4 includes a first frame portion 4a of the tire tread receiving device 2 and a second frame portion 4b of the tire shaft support device 3, and the first frame portion 4a is a rectangular parallelepiped frame. It is formed and is provided in the lower part of the second frame part 4b so as to protrude forward.

  Next, the tire tread receiving device 2 will be described with reference to FIGS.

  4 is a front sectional view showing details of the structure of the tire tread receiving device 2, FIG. 5 is a sectional view taken along line XX in FIG. 4, and FIG. 6 is a sectional view taken along line YY in FIG. It is.

  The tire tread receiving device 2 includes a first wheel 6 composed of a pair of front and rear sprockets 6 a and 6 b that are pivotally supported at a right position in the first frame portion 4 a and a pivotal support at a left position in the frame 4. Engaged with the sprocket 6a of the first wheel 6 and the sprocket 7a of the second wheel 7 at the front portion in the first frame portion 4a. The loop-like connecting means 8a comprising a wound chain and the rear portion in the first frame portion 4a are engaged with the sprocket 6b of the first wheel 6 and the sprocket 7b of the second wheel 7 and wound. And a plurality of strip-like plates 9 connected and locked to both front and rear loop connecting means 8a and 8b at both ends.

  The belt-like plate 9 has a vertically long rectangular shape and has a rigidity that does not deform even with the tread pressure of the tire, and is continuous with the loop-like connecting means 8a and 8b so as to contact each other on both sides of the belt-like plate 9. The flat upper surface of the continuous belt-like plate 9 positioned above forms a pseudo road surface A.

  Reference numeral 10 denotes a supporting means for supporting the lower surface of the belt-like plate 9 forming the tire tread receiving device 2 from below, and 11 denotes a lateral deviation preventing means for preventing the lateral deviation of the belt-like plate 9. Consists of a plurality of sets of strip-like plate supports 10a, 10b, 10c, etc., and each support is pivotally supported at an intermediate portion in a long body 10p and through holes formed at equal intervals in the long body 10p. The rotating shaft 10q and the rollers 10r fixed to both ends of each rotating shaft 10q. A pair of rollers 10r is attached to the left and right of the rotating shaft 10q, and the central portion of the rotating shaft 10q is rotatable. As a supporting structure, the force applied to each roller 10r is balanced.

  And the said strip | belt-shaped board support bodies 10a, 10b, 10c etc. are fixed on the base board 4c fixed to the 1st flame | frame part 4a while contacting the lower surface side of the strip | belt-shaped body 9 of the upper part of the said tire tread receiving apparatus 2. For example, three sets of belt-like plate bearing bodies 10a, 10b, and 10c are arranged in parallel under the center portion of the tire tread receiving device 2, and two sets are provided on the left and right sides of the center portion. The belt-like plate bearing bodies 10d, 10e, 10f, and 10g are arranged in parallel to equalize the load so that the simulated road surface A is supported.

  The lateral slip prevention means 11 includes a first lateral slip prevention body 11a at a front portion of the tire tread surface receiving device 2 and a second lateral slip prevention body 11b at a rear portion of the tire tread surface receiving device 2. The first and second lateral slip prevention bodies 11a and 11b are arranged on the first frame on the side of the front end of the continuous strip 9 located above the tire tread receiving device 2 and on the side of the rear end of the strip 9. A belt-like support plate 11c provided above the portion 4a, and a roller 11d pivotally supported by the belt-like support plate 11c. The rollers 11d of the first and second lateral shift prevention bodies 11a and 11b The front end surface and the rear end surface of the continuous belt-like plate 9, that is, the both side edges of the simulated road surface A are brought into contact with each other.

  Reference numeral 12 denotes an electric motor that drives the first wheel 6 forward or reversely through a transmission 13.

  Reference numeral 14 denotes an operator's work table.

  Next, the tire shaft support device 3 will be described.

  As shown in FIGS. 1 to 3, the tire shaft support device 3 includes a support shaft 3a for mounting a wheel on which a tire W is mounted and rotatably supporting the wheel, and the support shaft provided on the second frame portion 4b. The driving means 3b controls the rotation of the bearing 3 in the horizontal direction in the horizontal state, controls the tilt of the bearing shaft 3 in the up-down oblique direction, or controls the bearing shaft 3 up and down.

  A load cell (not shown) is attached to the support shaft 3, and a detection signal from the load cell is subjected to predetermined signal processing to obtain measurement data by a calculation means.

  Next, the usage method and effect of the tire testing machine 1 having the tire tread receiving device 2 of the present invention will be described.

  The measured tire W is mounted on a wheel and attached to the support shaft 3 a of the tire shaft support device 3.

  Then, the support shaft 3 is moved downward, and the lower surface portion of the measured tire W is brought into contact with the upper surface of the central portion of the tire tread receiving device 2, that is, the pseudo road surface A.

  Note that the pressure when the measured tire W abuts and the direction (inclination angle) of the bearing shaft 3a can be changed according to the needs of the test.

  Next, the first wheel 6 is rotationally driven by the electric motor 12, and the belt-like plate 9 in which the front and rear loop connection means 8a and 8b composed of chains engaged with the front and rear sprockets 6a and 6b of the first wheel 6 are continuous. It rotates with it. With this rotational movement, the measured tire W in contact with the flat pseudo road surface A on the upper surface of the strip 9 located above the strip 9 rotates.

  At this time, the front end surface and the rear end surface of the belt-like plate 9 that is rotationally moved above are in contact with the rollers 11d of the first lateral deviation prevention body 11a and the second lateral deviation prevention body 11b, and the lateral deviation of the belt-like board 9, that is, the pseudo road surface A. Thus, unlike the conventional flat belt type, the tire tread receiving apparatus 2 of the present invention can realize a zero slip angle.

  Therefore, it is possible to accurately measure uniformity, especially price tear and conicity, residual lateral force and SAT (self-aligning torque characteristics), for example, various characteristics for measuring improved vehicle lateral flow data. It is also possible to measure.

  Further, in the conventional belt type tire testing machine, since the flat belt is a consumable item, there is a problem that the maintenance cost of the tire testing machine is high. However, since the belt-like plate 9 of the present invention can be used semipermanently, The tire testing machine equipped with the tire tread receiving device of the invention also has an advantage of low maintenance cost.

  The tire testing machine equipped with the tire tread receiving device of the present invention is used in a production line for automobile tires.

DESCRIPTION OF SYMBOLS 1 Tire testing machine 2 Tire tread receiving apparatus 6, 7 Wheel (1st wheel, 2nd wheel)
6a, 6b, 7a, 7b Sprocket 9 Strip plate 10 Bearing means 10r, 11d Roller 11 Side slip prevention means A A simulated road surface

Claims (5)

  A large number of belt-like plates are connected to loop-like connecting means that spans the left and right wheels, and the upper surface of the belt-like plate located above is formed as a flat pseudo road surface having a predetermined length with which the measured tire abuts. In addition, a tire tread receiving device of a tire testing machine provided with lateral slip prevention means for preventing lateral displacement of the simulated road surface at both side edges of the simulated road surface.   The loop connection means is composed of a chain disposed on both sides of the belt-like plate, and the wheel is composed of a sprocket that engages with the chain, and the pseudo road surface moves forward or backward by forward and reverse rotation of the sprocket. The tire tread receiving device for a tire testing machine according to claim 1.   2. The tire tread receiving device for a tire testing machine according to claim 1, wherein the lateral slip prevention means includes a plurality of rollers that are pivotally supported in contact with both side edges of the pseudo road surface.   The tire tread receiving device for a tire testing machine according to claim 1, further comprising support means for supporting a lower surface of the belt-shaped plate forming the pseudo road surface.   5. The tire tread receiving device for a tire testing machine according to claim 4, wherein the supporting means comprises a plurality of rollers, and these rollers are formed so as to abut on and support the lower surface of the belt-like plate forming the pseudo road surface. apparatus.

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