Source: https://patents.google.com/patent/US20140311246
Timestamp: 2018-03-20 10:13:39
Document Index: 241004729

Matched Legal Cases: ['art 76', 'art 76', 'art 76', 'art 76', 'art 76', 'art 76']

US20140311246A1 - Tread thickness measuring method - Google Patents
US20140311246A1
US20140311246A1 US14357962 US201214357962A US20140311246A1 US 20140311246 A1 US20140311246 A1 US 20140311246A1 US 14357962 US14357962 US 14357962 US 201214357962 A US201214357962 A US 201214357962A US 20140311246 A1 US20140311246 A1 US 20140311246A1
US14357962
US9329032B2 (en )
B60C2011/0033—Thickness of the tread
The rim body moving means 73 includes a bridge member 75 placed between the left body 40 and right body 70 in a position near the top end thereof and a moving member 76 capable of moving along the bridge member 75. The bridge member 75, which may be a cylindrical shaft, bridges between the the left body 40 and the right body 70 in a position near the top end thereof. The bridge member 75 has a not-shown built-in drive mechanism capable of moving the moving member 76 along the axis thereof. The drive mechanism may, for instance, be constructed of a ball screw mechanism and a servo motor 74. Thus the ball nut may be moved as the servo motor 74 drives the ball screw of the ball screw mechanism. The servo motor 74, which is connected to the measurement control unit 100, operates in response to the signal outputted from the measurement control unit 100. The moving member 76 is constructed of a smaller ring part 76A, a larger ring part 76B secured to the larger diameter face 72B of the right rim body 72 and moving along the axis of the right main spindle 71, and a connecting member 76C connecting the smaller ring part 76A and the larger ring part 76B. The smaller ring part 76A is secured to the ball nut of the ball screw mechanism, which is the drive mechanism, whereas the larger ring part 76B is secured to the larger diameter face 72B of the right rim body 72. Thus, the tire T can be held or released as the right rim body 72 and the left rim body 42 are brought closer to or apart from each other by the drive of the servomotor 74 which moves the moving member 76 along the axis of the bridge member 75.
The arithmetic processing unit 200 includes a groove bottom position identifying means 201, a depth estimating means 202, a thickness predicting means 203, an amplification factor setting means 204, a reflected waves amplification means 205, and a thickness calculating means 206. FIG. 7 is a diagram showing a profile F of a tread surface Ts obtained by the shape measuring means 46.
More specifically, the groove bottoms corresponding to the groove bottoms N1 to N6 identified from the profile F by the groove bottom position identifying means 201 are detected from the tire design data. Then the depths from the groove bottoms detected from the tire design data to the points where the straight lines radially extending from the groove bottoms intersect with the radially outermost belt surface are calculated, respectively. These depths are now set as d1 to d6 from the groove bottoms N1 to N6 to the belt surface 94 a in the actual tire T. The positions of these set depths dl to d6 are then set as points X1 to X6 in the profile F. Next, the positions of both end portions of the belt are detected from the relationship between the depths from the groove bottoms detected from the tire design data to the belt surface and the position of the radially outermost belt in the tire design data, and the detected positions of both end portions are set as points X7 and X8 in the profile F. Then, a virtual belt corresponding to the belt 94 is set by connecting the points X1 to X8 with a line, and the positions of the virtual belt are estimated as the depths of the belt 94 from the groove bottoms N1 to N6. Note that the tire design data will be explained in detail in the description of the storage unit 207 later.
The thickness predicting means 203 calculates predicted thicknesses Dp based on the depths to the belt surface 94 a estimated from the relationship between the profile F of the tread surface Ts measured by the shape measuring means 46 and the depths dl to d6 from the groove bottoms N1 to N6 to the belt surface 94 a estimated by the depth estimating means 202. More specifically, virtual tread surface corresponding to the groove bottoms N1 to N6 are set by interpolation using the values of the tread surface Ts before and after the formation of the grooves M1 to M6. This is done because there is no tread surface Ts corresponding to the groove bottoms N1 to N6 in the profile F measured by the shape measuring means 46. Now the predicted thicknesses Dp from the tread surface Ts to the belt surface 94 a are set from the radial positions of the virtual tread surfaces with respect to the positions of the groove bottoms N1 to N6 and the radial position of the belt surface 94 a estimated by the depth estimating means 202.
Also, at point A3, as shown in FIG. 10A, with the received reflected waves amplified by an amplification factor of 10 dB, the second peak Q makes its appearance in addition to the first peak P of the reflected waves reflected from the tread surface Ts. Further, as shown in FIGS. 10B to 10E, with the amplification factor increased incrementally by 10 dB, the waveforms other than the first peak P and the second peak Q are seen making their appearances. However, as with point A, it is possible to consider the amplified waveforms other than the first peak P and the second peak as noises in the thickness measurement. Accordingly, the amplification factor of 20 dB, as shown in FIG. 10B, is employed, at which the reflection intensity of the second peak Q of the amplified reflected waves exceeds 40 as a result of incremental increase of the amplification factor. Hence, at point A3, the amplification factor is set at 20 dB when the tread thickness D is 2.8 mm as shown in FIG. 103.
US14357962 2011-11-14 2012-11-14 Tread thickness measuring method Active 2033-06-13 US9329032B2 (en)
JP2011-249077 2011-11-14
JP2011249077A JP5826608B2 (en) 2011-11-14 2011-11-14 Tread thickness measurement method
PCT/JP2012/079531 WO2013073584A1 (en) 2011-11-14 2012-11-14 Tread thickness measurement method
US20140311246A1 true true US20140311246A1 (en) 2014-10-23
US9329032B2 US9329032B2 (en) 2016-05-03
ID=48429639
US14357962 Active 2033-06-13 US9329032B2 (en) 2011-11-14 2012-11-14 Tread thickness measuring method
US (1) US9329032B2 (en)
JP (1) JP5826608B2 (en)
CN (1) CN103946669B (en)
EP (1) EP2781878B1 (en)
WO (1) WO2013073584A1 (en)
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