Power transmission system for vehicle

• US 10,001,206 B2
• Filed: 11/30/2016
• Issued: 06/19/2018
• Est. Priority Date: 12/10/2015
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Fujii, Kota, Yasuda, Yuji, Tabata, Atsushi, Suzuki, Haruhisa, Okuda, Koichi, Tateno, Hiroyuki
• Primary Examiner(s): MacArthur, Victor L
• Application Number:
  US15/365,504
• Publication Number:
  US 20170167592A1
• Time in Patent Office: 566 Days
• CPC Class Codes: B60K 6/365 with the gears having orbital motion
• CPC Class Codes: B60K 6/40 characterised by the assembly or relative disposition of components
• CPC Class Codes: B60K 6/442 Series-parallel switching type
• CPC Class Codes: B60K 6/445 Differential gearing distribution type
• CPC Class Codes: B60K 6/547 the transmission being a stepped gearing
• CPC Class Codes: B60Y 2200/92 Hybrid vehicles
• CPC Class Codes: B60Y 2306/09 Reducing noise
• CPC Class Codes: B60Y 2400/73 Planetary gearings
• CPC Class Codes: F16D 1/0835 due to the elasticity of the ring or sleeve
• CPC Class Codes: F16H 2200/0043 the gear ratios comprising four forward speeds
• CPC Class Codes: F16H 2200/201 with three sets of orbital gears
• CPC Class Codes: F16H 2200/2043 with five engaging means
• CPC Class Codes: F16H 2200/2066 using one freewheel mechanism
• CPC Class Codes: F16H 2200/2082 one freewheel mechanisms
• CPC Class Codes: F16H 3/728 with means to change ratio in the mechanical gearing
• CPC Class Codes: F16H 57/0006 Vibration-damping or noise reducing means specially adapted for gearings devices for varying tension of belts, ropes or chains with damping means F16H7/0829; toothed members with construction providing vibration damping F16H55/14; reducing vibrations or noise of the gearbox casing F16H57/028; suppression of vibrations or noise of gear selectors F16H59/0208; control of hydrostatic fluid gearing preventing or reducing vibrations or noise F16H61/4183
• CPC Class Codes: F16H 57/12 Arrangements for adjusting or for taking-up backlash not provided for elsewhere
• CPC Class Codes: Y02T 10/62 Hybrid vehicles
• CPC Class Codes: Y10S 903/911 with two or more gear sets
• CPC Class Codes: Y10S 903/919 Stepped shift

Abstract

A tolerance ring is arranged between an output-side rotary shaft and a rotor shaft. For this reason, even when looseness in a spline fitting portion of the output-side rotary shaft and rotor shaft is not filled, both the output-side rotary shaft and the rotor shaft are held by the tolerance ring so as not to rattle. Therefore, it is possible to reduce tooth hammer noise that occurs in the spline fitting portion.

Claims

1. A power transmission system for a vehicle, the power transmission system comprising:

a first rotary shaft;

a second rotary shaft that has a cylindrical shape, the first rotary shaft and the second rotary shaft arranged around a common axis;

a fitting portion at which outer peripheral teeth formed on an outer periphery of the first rotary shaft and inner peripheral teeth formed on an inner periphery of the second rotary shaft are fitted and coupled to each other so as to transmit power; and

a tolerance ring arranged between the outer periphery of the first rotary shaft and the inner periphery of the second rotary shaft, wherein

the second rotary shaft having an inner peripheral spigot joint surface, and

the first rotary shaft having a first outer peripheral spigot joint surface and a second outer peripheral spigot joint surface, the first outer peripheral spigot joint surface being provided at a position away from the outer peripheral teeth and the tolerance ring in the direction of the common axis, and the second outer peripheral spigot joint surface being provided between the outer peripheral teeth and the tolerance ring in a direction of the common axis;

wherein the inner peripheral spigot joint surface and the first outer peripheral spigot joint surface are fitted to each other, at a first spigot joint portion, and the inner peripheral spigot joint surface and the second outer peripheral spigot joint surface are fitted to each other, at a second spigot joint portion, so as to prevent a misalignment between the axis of the first rotary shaft and the axis of the second rotary shaft, and

wherein a first distance in a radial direction between the first spigot joint portion and the common axis and a second distance in the radial direction between the second spigot joint portion and the common axis are the same, and each of the first and second distances in the radial direction is greater than a third distance in the radial direction between the fitting portion and the common axis.

2. The power transmission system according to claim 1, wherein

the tolerance ring is accommodated in an annular groove arranged on the outer periphery of the first rotary shaft, and the tolerance ring includes outward-directed protrusions that contact the second rotary shaft.

3. A power transmission system for a vehicle, the power transmission system comprising:

a first rotary shaft;

a second rotary shaft that has a cylindrical shape, the first rotary shaft and the second rotary shaft arranged around a common axis;

a fitting portion at which outer peripheral teeth formed on an outer periphery of the first rotary shaft and inner peripheral teeth formed on an inner periphery of the second rotary shaft are fitted and coupled to each other so as to transmit power; and

a tolerance ring arranged between the outer periphery of the first rotary shaft and the inner periphery of the second rotary shaft, wherein

the first rotary shaft having an outer peripheral spigot joint surface, and

the second rotary shaft having a first inner peripheral spigot joint surface and a second inner peripheral spigot joint surface, the first inner peripheral spigot joint surface being provided at a position away from the inner peripheral teeth and the tolerance ring in the direction of the common axis, and the second inner peripheral spigot joint surface being provided between the inner peripheral teeth and the tolerance ring in a direction of the common axis;

wherein the outer peripheral spigot joint surface and the first inner peripheral spigot joint surface are fitted to each other, at a first spigot joint portion, and the outer peripheral spigot joint surface and the second inner peripheral spigot joint surface are fitted to each other, at a second spigot joint portion, so as to prevent misalignment between the axis of the first rotary shaft and the axis of the second rotary shaft, and

wherein a first distance in a radial direction between the first spigot joint portion and the common axis and a second distance in the radial direction between the second spigot joint portion and the common axis are the same, and each of the first and second distances in the radial direction is greater than a third distance in the radial direction between the fitting portion and the common axis.

4. The power transmission system according to claim 3, wherein

the tolerance ring is accommodated in an annular groove arranged on the inner periphery of the second rotary shaft, and the tolerance ring includes inward-directed protrusions that contact the first rotary shaft.