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US 2022/0178271 A1Published application
Variable displacement exhaust turbocharger
AssigneeMitsubishi Heavy Industries Engine & Turbocharger, Ltd.
InventorsYuya NAKAHARA, Toyotaka YOSHIDA, Yosuke DAMMOTO, Yoji AKIYAMA
Life of this patent
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Abstract
A variable displacement exhaust turbocharger according to at least one embodiment comprises: a plurality of nozzle vanes; an annular drive ring; and a lever plate fitted at one end in a groove portion disposed in the drive ring via a connecting pin portion and connected at another end to each nozzle vane. The value of dimensionless slippage S between the groove portion and the connecting pin portion is equal to or less than 0.0016. The dimensionless slippage S is represented by a certain equation.
Claims9
A variable displacement exhaust turbocharger, comprising:
- a plurality of nozzle vanes;
- an annular drive ring;
- and
- a lever plate fitted at one end in a groove portion disposed in the drive ring via a connecting pin portion and connected at another end to each nozzle vane,
- wherein a value of dimensionless slippage S between the groove portion and the connecting pin portion is equal to or less than 0.0016 when the dimensionless slippage S is represented by the following equation (A):
- S={(L+rp+r)cos(Φmx+Ψ)}−1[r sin θmx−(L+r)sin Φmx×dΦ/dθ+{(L+r)cos Φmx−L−r cos θmx}tan θmx+Ψ)dΦ/dθ]+rp(1−dΦ/dθ)/(L+rp+r) (A),
- where r is a distance between a central position of the connecting pin portion and a rotation center of the nozzle vane,
- rp is a radius of the connecting pin portion,
- L is a distance between a rotation center of the drive ring and the rotation center of the nozzle vane,
- Ψ is an angle of a wall surface of the groove portion formed to be contactable with the connecting pin portion with respect to a radial direction of the drive ring,
- θ is an angle between a line segment passing through the rotation center of the drive ring and the rotation center of the nozzle vane and a line segment connecting the central position of the connecting pin portion to the rotation center of the nozzle vane,
- θmx is a possible maximum value of the angle θ,
- Φ is a rotation angle of the drive ring based on an angular position of the drive ring when the angle θ is 0 degrees,
- Φmx is the rotation angle Φ when the angle θ is θmx, and
- dΦ/dθ in the equation (A) is represented by the following equation (B):
- dΦ/dθ={r cos θmx+r sin θmx tan(Φmx+Ψ)}/[(L+r cos θmx){1+tan2(Φmx+Ψ)}−(L+r)tan(Φmx+Ψ){cos Φmx tan(Φmx+Ψ)−sin Φmx}] (B).
13 more elements
A variable displacement exhaust turbocharger, comprising:
- a plurality of nozzle vanes;
- an annular drive ring;
- and
- a lever plate fitted at one end in a groove portion disposed in the drive ring via a connecting pin portion and connected at another end to each nozzle vane,
- wherein a value of dimensionless slippage S between the groove portion and the connecting pin portion is equal to or less than 0.0016 when the dimensionless slippage S is represented by the following equation (C):
- S=L(rp cos Φmx+r sin θmx)/{(L+rp+r)(L2+r2+2Lr cos θmx)1/2} (C),
- where r is a distance between a central position of the connecting pin portion and a rotation center of the nozzle vane,
- rp is a radius of the connecting pin portion,
- L is a distance between a rotation center of the drive ring and the rotation center of the nozzle vane,
- an angle of a wall surface of the groove portion formed to be contactable with the connecting pin portion with respect to a radial direction of the drive ring is 0 degrees,
- θ is an angle between a line segment passing through the rotation center of the drive ring and the rotation center of the nozzle vane and a line segment connecting the central position of the connecting pin portion to the rotation center of the nozzle vane,
- θmx is a possible maximum value of the angle θ,
- Φ is a rotation angle of the drive ring based on an angular position of the drive ring when the angle θ is 0 degrees, and
- Φmx is the rotation angle Φ when the angle θ is θmx.
11 more elements
A variable displacement exhaust turbocharger, comprising:
- a plurality of nozzle vanes;
- an annular drive ring;
- and
- a lever plate fitted at one end in a groove portion disposed in the drive ring via a connecting pin portion and connected at another end to each nozzle vane,
- wherein a wall surface of the groove portion formed to be contactable with the connecting pin portion is oblique to a radial direction of the drive ring so that the wall surface is inclined in a rotation direction of the drive ring to increase opening degree of the nozzle vane as the wall surface goes outward in the radial direction of the drive ring.
2 more elements
Dependencies are inferred from the claim text.