VEHICLE POWER TRANSMISSION SYSTEM AND MANUFACTURING METHOD FOR THE SAME

• US 20170314649A1
• Filed: 04/20/2017
• Published: 11/02/2017
• Est. Priority Date: 04/28/2016
• Status: Abandoned Application

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: MICHIKOSHI, Yosuke, IKEMURA, Masashi
• Application Number:
  US15/492,353
• Publication Number:
  US 20170314649A1
• Time in Patent Office: Days
• CPC Class Codes: B23P 15/00 Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
• CPC Class Codes: B23P 2700/50 Other automobile vehicle parts, i.e. manufactured in assembly lines
• CPC Class Codes: F16H 2057/02047 Automatic transmissions
• CPC Class Codes: F16H 2057/087 Arrangement and support of friction devices in planetary gearings, e.g. support of clutch drums, stacked arrangements of friction devices see also arrangements for shifting planetary gears F16H3/62, F16H63/3026
• CPC Class Codes: F16H 2200/006 the gear ratios comprising eight forward speeds
• CPC Class Codes: F16H 2200/2007 with two sets of orbital gears
• CPC Class Codes: F16H 2200/201 with three sets of orbital gears
• CPC Class Codes: F16H 2200/2023 using a Ravigneaux set with 4 connections
• CPC Class Codes: F16H 2200/2046 with six 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 2200/2097 comprising an orbital gear set member permanently connected to the housing, e.g. a sun wheel permanently connected to the housing
• CPC Class Codes: F16H 3/663 with conveying rotary motion between axially spaced orbital gears, e.g. RAVIGNEAUX
• CPC Class Codes: F16H 3/666 with compound planetary gear units, e.g. two intermeshing orbital gears F16H3/663 takes precedence
• 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 57/0025 with gearing elements rigidly connected to a shaft, e.g. securing gears or pulleys by specially adapted splines, keys or methods
• CPC Class Codes: F16H 57/08 of gearings with members having orbital motion
• CPC Class Codes: F16H 57/12 Arrangements for adjusting or for taking-up backlash not provided for elsewhere

Abstract

When a third sun gear is fitted into a fitting hole of a clutch drum, external circumferential spline teeth and internal circumferential spline teeth that configure a spline-fitted part start meshing with each other before a tolerance ring comes into contact with the third sun gear and the clutch drum. Accordingly, the external circumferential spline teeth and the internal circumferential spline teeth mesh with each other, thereby centering the third sun gear and the clutch drum, thus accurately assembling the third sun gear and the clutch drum without causing eccentricity thereof

Claims

1. A manufacturing method for a vehicle power transmission system,

the vehicle power transmission system including

a first rotary body configured to rotate around an axial line, and

a second rotary body including a fitting hole into which one end portion of the first rotary body is fitted,

the second rotary body being configured to rotate around the axial line,

the first rotary body and the second rotary body being configured such that external circumferential teeth provided on an outer circumferential surface of the first rotary body and internal circumferential teeth provided on an inner circumferential surface of the fitting hole are spline-fitted to each other at a spline-fitted part,

the manufacturing method comprising:

disposing a tolerance ring at a position closer to an opening of the fitting hole than to the spline-fitted part in a forward direction of assembling the second rotary body to the first rotary body when the first rotary body is fitted into the fitting hole of the second rotary body; and

bringing the tolerance ring to come into contact with the first rotary body and the second rotary body after the external circumferential teeth of the first rotary body and the internal circumferential teeth of the second rotary body mesh with each other, in a transitional state in which the first rotary body is fitted into the fitting hole of the second rotary body.

2. A vehicle power transmission system comprising:

a first rotary body configured to rotate around an axial line;

a second rotary body including a fitting hole into which one end portion of the first rotary body is fitted, the second rotary body being configured to rotate around the axial line, the first rotary body and the second rotary body being configured such that external circumferential teeth provided on an outer circumferential surface of the first rotary body and internal circumferential teeth provided on an inner circumferential surface of the fitting hole are spline-fitted to each other at a spline-fitted part; and

a tolerance ring provided between the outer circumferential surface of the first rotary body and an inner circumferential surface of the second rotary body, the tolerance ring being located at a position closer to an opening of the fitting hole than to the spline-fitted part in an axial line direction,

a length in the axial line direction of a part where the external circumferential teeth and the internal circumferential teeth overlap each other as viewed from a radial direction being longer than a length in the axial line direction of the outer circumferential surface of the first rotary body or the inner circumferential surface of the second rotary body that come into contact with the tolerance ring.

3. The vehicle power transmission system according to claim 2, wherein

the tolerance ring is housed in an annular groove provided in the inner circumferential surface of the fitting hole of the second rotary body.

4. The vehicle power transmission system according to claim 2, wherein

the vehicle power transmission system includes a first planetary gear unit, a second planetary gear unit, and a third planetary gear unit,

the first planetary gear unit, the second planetary gear unit, and the third planetary gear unit are configured to rotate around a common axial line,

the second planetary gear unit and the third planetary gear unit constitute a ravigneaux planetary gear including a carrier that serves as a carrier of the second planetary gear and a carrier of the third planetary gear and a ring gear that serves as a ring gear of the second planetary gear and a ring gear of the third planetary gear,

a clutch is provided between a ring gear of the first planetary gear unit and a sun gear of the third planetary gear unit,

the spline-fitted part is provided between the sun gear and a clutch drum of the clutch,

the first rotary body is the sun gear, and

the second rotary body is the clutch drum.