Automatic transmission
First Claim
1. An automatic transmission comprising:
- a torque convener comprising a pump impeller, a turbine runner, and a stator;
a transmission input shaft to which the turbine runner is attached;
a transmission mechanism that changes a transmission ratio to change input torque and input speed transmitted to the transmission input shaft;
a stator shaft that supports the stator on an outer periphery and rotatably supports the transmission input shaft on an inner periphery;
a magnetostrictive torque sensor that detects a magnitude of the input torque transmitted to the transmission input shaft;
the magnetostrictive torque sensor comprising;
(i) a magnetic material having a magnetostrictive property and attached onto an outer periphery of the transmission input shaft; and
(ii) a cylindrical magnetic-property detector mourned on the inner periphery of the stator shalt and arranged to be opposite to the magnetic material to detect a change in a magnetic property of the magnetic material, occurring owing to the input torque applied to the transmission input shalt; and
a torque-sensor retaining sleeve fitted to the inner periphery of the stator shaft, wherein the torque-sensor retaining sleeve is configured to prevent axial motion of the magnetostrictive torque sensor relative to the stator shaft to retain the magnetostrictive torque sensor at a predetermined installation position.
1 Assignment
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Accused Products
Abstract
In an automatic transmission having a torque converter with a pump impeller, a turbine runner, and a stator, a stator shaft is provided to support the stator on its outer periphery and to rotatably support a transmission input shaft on its inner periphery. A magnetostrictive torque sensor is provided to detect the magnitude of input torque transmitted to the transmission input shaft. The magnetostrictive torque sensor includes a magnetic material having a magnetostrictive property and attached onto the outer periphery of the transmission input shaft, and a cylindrical magnetic-property detector mounted on the inner periphery of the stator shaft and arranged to be opposite to the magnetic material to detect a change in a magnetic property of the magnetic material, occurring owing to the input torque applied to the transmission input shaft.
55 Citations
10 Claims
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1. An automatic transmission comprising:
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a torque convener comprising a pump impeller, a turbine runner, and a stator;
a transmission input shaft to which the turbine runner is attached;
a transmission mechanism that changes a transmission ratio to change input torque and input speed transmitted to the transmission input shaft;
a stator shaft that supports the stator on an outer periphery and rotatably supports the transmission input shaft on an inner periphery;
a magnetostrictive torque sensor that detects a magnitude of the input torque transmitted to the transmission input shaft;
the magnetostrictive torque sensor comprising;
(i) a magnetic material having a magnetostrictive property and attached onto an outer periphery of the transmission input shaft; and
(ii) a cylindrical magnetic-property detector mourned on the inner periphery of the stator shalt and arranged to be opposite to the magnetic material to detect a change in a magnetic property of the magnetic material, occurring owing to the input torque applied to the transmission input shalt; and
a torque-sensor retaining sleeve fitted to the inner periphery of the stator shaft, wherein the torque-sensor retaining sleeve is configured to prevent axial motion of the magnetostrictive torque sensor relative to the stator shaft to retain the magnetostrictive torque sensor at a predetermined installation position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An automatic transmission comprising:
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a torque converter comprising a pump impeller, a turbine runner, and a stator;
a transmission input shaft to which the turbine runner is attached;
a transmission mechanism that changes a transmission ratio to change input torque and input speed transmitted to the transmission input shaft;
a stator shaft that supports the stator on an outer periphery and rotatably supports the transmission input shaft on an inner periphery;
a magnetostrictive torque sensor that detects a magnitude of the input torque transmitted to the transmission input shaft;
the magnetostrictive torque sensor comprising;
(i) a magnetic material having a magnetostrictive property and attached onto an outer periphery of the transmission input shaft; and
(ii) a cylindrical magnetic-property detector mounted on the inner periphery of the stator shaft and arranged to be opposite to the magnetic material to detect a change in a magnetic property of the magnetic material, occurring owing to the input torque applied to the transmission input shaft; and
(iii) a wiring harness passage configured to contain a wiring harness that is connected with the torque sensor, wherein the wiring harness passage is obliquely shaped with respect to the stator shaft; and
an engine-driven oil pump mounted on the outer periphery of the stator shaft, and arranged between the torque converter and the transmission mechanism, wherein;
the transmission input shaft has a portion that defines an axial central oil passage formed in the transmission input shaft and a portion that defines at least one radial oil passage formed in the transmission input shaft to supply hydraulic pressure from the oil pump through the radial oil passage to the axial central oil passage;
the stator shaft has a portion that defines a communication oil passage formed in the stator shaft to supply the hydraulic pressure from the oil pump to the radial oil passage;
the magnetostrictive torque sensor is spaced axially away from the communication oil passage formed in the stator shaft so that the magnetostrictive torque sensor is axially offset from the communication oil passage toward a side of the torque converter, under a condition wherein the magnetostrictive torque sensor is mounted on the inner periphery of the stator shaft.
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Specification