EP0052809A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Apparatus for measuring tire uniformity
Assignee: Toyota Central R&D Labs Inc
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Filing: 1981-10-30
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Granted: —
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Expires: 2001-10-30
Abstract
Abstract The automotive tire (T) being measured is loaded in advance by the load applying means (24), and the drum (21) is driven to rotate the tire. A displacement of the rotatable shaft (22) produced in response to a variation in the radial force acting between the tire and the drum is detected as a displacement of the movable member (23) which is in turn indicated as the radial force variation generated on the tire. Thus, the apparatus can measure a radial force variation with precision under a condition approximating an actual running condition of automobiles.
Inventors
- 👤 Shunichi Doi
- 👤 Junzo Hasegawa
- 👤 Mutsuo Sawa
- 👤 Yasutaka Hayashi
- 👤 Kazuo Miki
- 👤 Yuzo Yamamoto
- 👤 Satoru Matsushima
- 👤 Katsuhiko Fukui
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 20:39
CPC Classifications
G; G01; G01M; G01M17/00; G01M17/007; G01M17/02; G01M17/022
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
210 words
A tire uniformity measuring apparatus for measuring tire uniformity comprising: a drum (1, 11, 21, 31) for rotating a tire (T) being measured; a rotatable shaft (2, 12, 22, 32) having a member for securing the tire; a movable member (3, 13, 23) disposed at a predetermined position with respect to said drum and having a portion rotatably supporting said rotatable shaft, said movable member being responsive to the force acting between said drum and the tire being measured for positionally changing said portion rotatably supporting said rotatable shaft; load applying means (4, 14, 24, 34) for applying in advance a predetermined load to the tire being measured by changing the interaxial distance between said drum and said rotatable shaft; detecting means (5, 15, 25, 35) for detecting a displacement of said rotatable shaft, as a displacement of said movable member, produced in response to a variation in the radial force acting between the tire being measured and said drum when the tire is rotated by said drum; and means (6, 16, 26, 36) for indicating a variation in the radial force on the tire being measured based on the displacement of said movable member, whereby a variation . in the radial force imposed on the tire can be measured.
Claim 2
Dependent Claim
210 words
A tire uniformity measuring apparatus for measuring tire uniformity comprising: a drum (1, 11, 21, 31) for rotating a tire (T) being measured; a rotatable shaft (2, 12, 22, 32) having a member for securing the tire; a movable member (3, 13, 23) disposed at a predetermined position with respect to said drum and having a portion rotatably supporting said rotatable shaft, said movable member being responsive to the force acting between said drum and the tire being measured for positionally changing said portion rotatably supporting said rotatable shaft; load applying means (4, 14, 24, 34) for applying in advance a predetermined load to the tire being measured by changing the interaxial distance between said drum and said rotatable shaft; detecting means (5, 15, 25, 35) for detecting a displacement of said rotatable shaft, as a displacement of said movable member, produced in response to a variation in the radial force acting between the tire being measured and said drum when the tire is rotated by said drum; and means (6, 16, 26, 36) for indicating a variation in the radial force on the tire being measured based on the displacement of said movable member, whereby a variation . in the radial force imposed on the tire can be measured.
Claim 3
Dependent Claim
66 words
A tire uniformity measuring apparatus according to claim 1, wherein said movable member (3, 23) comprising a pivot arm having one end pivotably supported and including at a suitable position thereof said supporting portion supporting said rotatable shaft (2) for rotation with the tire (T) being measured, whereby said arm is angularly movable in response to a variation in the force imposed radially on the tire.
Claim 4
Dependent Claim
83 words
A tire uniformity measuring apparatus according to claim 1, wherein said movable member (13) comprising a cantilever (17) having one end rigidly secured to a frame (MB, MH) and including at the other end said supporting portion supporting said rotatable shaft (12) for rotation with the tire (T) being measured, and also comprising at a suitable position a stress-concentrative member (SG) which is mostly deformable when said cantilever is bent in response to a variation in the force imposed radially on the tire.
Claim 5
Dependent Claim
82 words
A tire uniformity measuring apparatus according to claim 1, wherein said movable member (23) comprising a pivot arm pivotably supported at its center and having on one end thereof said supporting portion supporting said rotatable shaft (22) for rotation with the tire (T) being measured, whereby the other end of said arm is angularly movable in a direction opposite to the direction of angular movement of said one end in response to a variation in the force imposed radially on the tire.
Claim 6
Dependent Claim
36 words
A tire uniformity measuring apparatus according to claim 1, wherein said load applying means (4, 14, 24, 34) moves said drum (1, 11, 21, 31) in order to apply the predetermined load to the tire (T).
Claim 7
Dependent Claim
30 words
A tire uniformity measuring apparatus according to claim 5, wherein said drum (1, 11, 21) is provided under the tire (T), in order to mount the tire on said drum.
Claim 8
Dependent Claim
20 words
A tire uniformity measuring apparatus according to claim 5, wherein said drum (31) is provided laterally to the tire (T).
Claim 9
Dependent Claim
29 words
A tire uniformity measuring apparatus according to claim 6, wherein said drum (1, 11, 31) rotatably mounts on a movable member (B1, B2, B3) of said load applying means.
Claim 10
Dependent Claim
44 words
A tire uniformity measuring apparatus according to claim 8, wherein said movable member (B1) comprises a swing member pivotably supported at one end thereof in order to change the position thereof in the vertical direction in response to the angle of said swing member.
Claim 11
Dependent Claim
51 words
A tire uniformity measuring apparatus according to claim 8, wherein said movable member (B1) comprises a plate member (B1, B2) rotatably supporting said drum (1), and jack means (JK, PJK) for changing the position of said plate member in the vertical direction, fixed to said plate member at one end thereof.
Claim 12
Dependent Claim
48 words
A tire uniformity measuring apparatus according to claim 8, wherein said movable member comprises a table(B3) having two bearings (TB1, TB2) at both ends thereof, and a frame (BL) having horizontal guide rail (SL2) and perpendicular guide rail (SL1) on which said bearings of said table is rolled.
Claim 13
Dependent Claim
129 words
A tire uniformity measuring apparatus according to claim 1, wherein said detecting means (5) comprises a steel ribbon (SR) connected to said movable member (3) at one end thereof, two pulleys (PL1, PL2) for guiding said steel ribbon, a counterbalance (BW) equipped to the other end of said ribbon, a first pivotable lever (LV) connected to said steel ribbon, and an indicating means (6) comprising a second pivotable lever (LV1) connected to said first pivotable lever (LV), a circular chart plate (CP) synchronously driven to the rotation of the tire (T) by a chain (CH2), a load weight (LW) equipped to predetermined portion of said second pivotable lever (LV1), and a pen (P) equipped to one end of said second pivotable lever and recorded on said circular chart plate.
Claim 14
Dependent Claim
26 words
A tire uniformity measuring apparatus according to claim 3, wherein said detecting means (16) comprises a strain gauge (SG) attached on a suitable position concentratively stressed.
Claim 15
Dependent Claim
36 words
A tire uniformity measuring apparatus according to claim 4, wherein said detecting means (26) comprises a load cell (LC), for detecting the load, provided at a position opposed to the other end of said pivot arm.
References Cited (Backward Citations)
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