Transmission mechanism

Patent metadata

Field	Value
Publication number	US-10428906-B2
Application number	US-201715411146-A
Country	US
Kind code	B2
Filing date	Jan 20, 2017
Priority date	Feb 9, 2016
Publication date	Oct 1, 2019
Grant date	Oct 1, 2019

Abstract

A transmission mechanism includes a plurality of drive gears disposed on a counter shaft and a plurality of driven gears disposed on a drive shaft. Each of the plurality of drive gears is engaged with each of the plurality of driven gears to form a plurality of shift-gear pairs. An eight-speed drive gear, which forms an eight-speed shift-gear pair having the smallest reduction gear ratio, and a seven-speed drive gear, which forms a seven-speed shift-gear pair having the second smallest reduction gear ratio, are disposed adjacent one another at a center portion of an arrangement of the drive gears. An eight-speed driven gear, which forms the eight-speed shift-gear pair, and a seven-speed driven gear, which forms the seven-speed shift-gear pair, are disposed adjacent one another at a center portion of an arrangement of the driven gears.

First claim

What is claimed is:

1. A transmission mechanism comprising:
an input shaft to which a rotative power is transmitted;
a plurality of drive gears arranged in an axial direction on the input shaft, wherein:
the plurality of drive gears comprise slide gears reciprocatable in the axial direction of the input shaft, and free gears disposed adjacent to the slide gears in the axial direction of the input shaft and rotatable relative to the input shaft, and
convex portions projecting from end surfaces in the axial direction of teeth are disposed on ones of the slide gears and the free gears included in the plurality of drive gears and adjacent to one another, hollow portions depressing from end surfaces in the axial direction of teeth are disposed on others, and the convex portions are fitted into the hollow portions to couple the slide gears and the free gears included in the plurality of drive gears and adjacent one another so as to ensure the transmission of the rotative power;

an output shaft that outputs a rotative power outside; and
a plurality of driven gears arranged in an axial direction on the output shaft, wherein:
the plurality of driven gears comprise slide gears reciprocatable in the axial direction of the output shaft, and free gears disposed adjacent to the slide gears in the axial direction of the output shaft and rotatable relative to the output shaft,
convex portions projection from end surfaces in the axial direction of teeth are disposed on ones of the slide gears and the free gears included in the plurality of driven gears and adjacent one another, hollow portions depressing from end surfaces in the axial direction of teeth are disposed on others, and the convex portions are fitted into the hollow portions to couple the slide gears and the free gears included in the plurality of driven gears and adjacent one another so as to ensure the transmission of the rotative power,
each of the plurality of drive gears is engaged with each of the plurality of driven gears so as to ensure transmission of the rotative power to form a plurality of shift-gear pairs, the plurality of shift-gear pairs having mutually different reduction gear ratios,
a first drive gear included in a first shift-gear pair and a second drive gear included in a second shift-gear pair are adjacent one another at a center portion of an arrangement of the plurality of drive gears, the first shift-gear pair having a smallest reduction gear ratio among the plurality of shift-gear pairs, and the second shift-gear having a small reduction gear ratio next to the first shift-gear pair, and
a first driven gear included in the first shift-gear pair and a second driven gear included in the second shift-gear pair are adjacent one another at a center portion of an arrangement of the plurality of driven gears.

2. The transmission mechanism according to claim 1 , wherein:
each of the plurality of slide gears included in the plurality of drive gears and the plurality of driven gears is adjacent to two free gears having mutually different outside diameters among the plurality of free gears,
a hollow portion is disposed on a free gear having a large diameter of the two free gears, the hollow portion ensuring insert of an end portion in an axial direction of the slide gear adjacent to the free gear having the large diameter and
when the free gear having the large diameter is coupled to the slide gear adjacent to the free gear having the large diameter so as to ensure the transmission of the rotative power, a part of the free gear having the large diameter is superimposed on a part of the slide gear adjacent to the free gear having the large diameter, viewed from a direction perpendicular to a rotational center line.

3. The transmission mechanism according to claim 2 , wherein
differences of counts of shift stages of the free gears having the large diameters and counts of shift stages of the slide gears adjacent to the free gears having the large diameter are all identical.

4. The transmission mechanism according to claim 1 , wherein:
the plurality of drive gears further include a plurality of fixed gears that are nonmovable in the axial direction with respect to the input shaft and integrally rotate with the input shaft, and
the free gears, the slide gears, and the fixed gears included in the plurality of drive gears are symmetrically disposed about a center of the arrangement of the plurality of drive gears.

5. The transmission mechanism according to claim 1 , wherein:
the plurality of driven gears further include a plurality of fixed gears that are nonmovable in the axial direction with respect to the output shaft and integrally rotate with the output shaft, and
the free gears, the slide gears, and the fixed gears included in the plurality of driven gears are symmetrically disposed about a center of the arrangement of the plurality of driven gears.

Assignees

• Suzuki Motor Corp

Inventors

• Takahashi Hideaki

Classifications

• F16H3/30 Primary

  with driving and driven shafts not coaxial · CPC title

• F16H3/089

  all of the meshing gears being supported by a pair of parallel shafts, one being the input shaft and the other the output shaft, there being no countershaft involved · CPC title

• B62M11/06

  with spur gear wheels (B62M11/14 takes precedence) · CPC title

• F16H63/18 Primary

  the final actuating mechanism comprising cams · CPC title

• F16H2063/3093

  Final output elements, i.e. the final elements to establish gear ratio, e.g. coupling sleeves or other means establishing coupling to shaft · CPC title