Transmission of internal combustion engine

• US 9,822,866 B2
• Filed: 03/24/2015
• Issued: 11/21/2017
• Est. Priority Date: 03/28/2014
• Status: Active Grant

• Current Assignee: Honda Motor Co., Ltd. (Honda Motor Company)
• Original Assignee: Honda Motor Co., Ltd. (Honda Motor Company)
• Inventors: Mizuno, Kinya, Konaka, Junji, Fujimoto, Yasushi, Makita, Hiroyuki
• Primary Examiner(s): Joyce, William C
• Assistant Examiner(s): Brown, Joseph
• Application Number:
  US14/666,597
• Publication Number:
  US 20150276018A1
• Time in Patent Office: 973 Days
• CPC Class Codes: F16C 19/54 Systems consisting of a plurality of bearings with rolling friction spindle bearings F16C35/08
• CPC Class Codes: F16C 2361/61 Toothed gear systems, e.g. support of pinion shafts in general F16H57/02
• CPC Class Codes: F16D 2021/0661 Hydraulically actuated multiple lamellae clutches
• CPC Class Codes: F16D 2021/0692 with two clutches arranged axially without radial overlap
• CPC Class Codes: F16D 21/06 at least two driving shafts or two driven shafts being concentric
• CPC Class Codes: F16D 2300/12 Mounting or assembling
• CPC Class Codes: F16D 25/0638 with more than two discs, e.g. multiple lamellae
• CPC Class Codes: F16D 25/10 Clutch systems with a plurality of fluid-actuated clutches arrangements or mounting of clutches in vehicles B60K17/00
• CPC Class Codes: F16D 3/12 specially adapted for accumulation of energy to absorb shocks or vibration by making use of fluid elements F16D3/80
• CPC Class Codes: F16H 2057/0012 for reducing drive line oscillations
• CPC Class Codes: F16H 2057/02065 for motorcycles or squads
• CPC Class Codes: F16H 3/006 power being selectively transmitted by either one of the parallel flow paths
• 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 57/021 Shaft support structures, e.g. partition walls, bearing eyes, casing walls or covers with bearings
• CPC Class Codes: F16H 57/038 Gearboxes for accommodating bevel gears F16H57/037 takes precedence
• CPC Class Codes: F16H 57/0436 Pumps
• CPC Class Codes: Y10T 74/19614 Disconnecting means

Abstract

A transmission of an internal combustion engine in which the shaft length of a main shaft can be shortened to eliminate a supporting wall around a reduction gear while a thrust load is received. Around a main shaft of a transmission of an internal combustion engine, a primary bearing is fastened to an inside of a primary driven gear, and is disposed between the primary driven gear and the main shaft. A collar member is disposed between the primary bearing and a main bearing. A step portion, in contact with the main bearing, is formed on the main shaft on an opposite side of the main bearing from the collar member. A cylindrical portion, an inner race of the primary bearing, the collar member, and an inner race of the main bearing are fastened to the side of the step portion.

Claims

1. A transmission of an internal combustion engine, the transmission comprising:

a primary driven gear for meshing with a primary drive gear mounted on a crankshaft side of an engine, said primary driven gear being rotatable on a main shaft of the transmission;

a clutch including a clutch outer rotating integrally with the primary driven gear and a clutch center selectively rotatable relative to the clutch outer, said clutch center rotates integrally with the main shaft and is fastened in an axial direction by a fastening member;

a main bearing mounted between the main shaft and a transmission case wall portion, said main bearing including an inner race having an inner side surface and an outer side surface and said main bearing transmitting a thrust load to the transmission case wall portion;

the primary drive gear and the primary driven gear being formed as helical gears;

around the main shaft;

a primary bearing is fastened to an inside of the primary driven gear, and is disposed between the primary driven gear and the main shaft, said primary bearing including an inner race having an inner side surface and an outer side surface with balls of the primary bearing being disposed between the inner race and an outer race of the primary bearing, and said primary bearing being housed in a bearing housing portion on the inside of the primary driven gear by inserting the outer race into an inner wall surface of the bearing housing portion; and

a collar member is positioned around the main shaft and between the inner side surface of the inner race of the primary bearing and the outer side surface of the inner race of the main bearing;

a step portion formed on an outer shaft wherein the inner side surface of the inner race of the main bearing is in contact with the step portion;

a cylindrical portion of the clutch center is aligned with the outer side surface of the inner race of the primary bearing being aligned with the collar member, the collar member is positioned around the main shaft and in engagement with the inner side surface of the inner race of the primary bearing and in engagement with the outer side surface of the inner race of the main bearing wherein the cylindrical portion of the clutch center, the inner race of the primary bearing, the collar member and the inner race of the main bearing are aligned adjacent to each other and are fastened to the step portion formed on the outer shaft by fastening the fastening member; and

a flange wall extended to an inner side of a shaft diameter is provided on the bearing housing portion, said flange wall extending from the inner wall surface of the bearing housing portion to an inside in a radial direction so as to abut against an inner side surface of the outer race of the primary bearing, the inner side surface of the outer race of the primary bearing being on an opposite side from a side of the clutch.

2. The transmission of the internal combustion engine according to claim 1, wherein:

a damper spring mounted within the clutch center, the damper spring being disposed along a circumferential direction;

a housing portion for housing the damper spring is a swelling portion swelling out to a side of the primary bearing; and

an intra-clutch collar member is mounted around the main shaft on a side of the clutch center where the swelling portion is disposed.

3. The transmission of the internal combustion engine according to claim 2, wherein an oil pump drive sprocket includes a substantially L-shaped cross section with a large-diameter end portion for engaging a recessed portion in the primary driven gear for rotating the oil pump drive sprocket integrally with the primary driven gear, said oil pump drive sprocket being in engagement with a rib projecting from the collar member to prevent axial displacement and being rotatable relative to the collar member.

4. The transmission of the internal combustion engine according to claim 1, wherein an oil pump drive sprocket is mounted on the collar member, said oil pump drive sprocket being rotated integrally with the primary driven gear, said oil pump drive sprocket being rotatable relative to the collar member.

5. A transmission of an internal combustion engine, comprising:

a helical primary driven gear for meshing with a helical primary drive gear mounted on a crankshaft side of an engine, said primary driven gear being rotatable on a main shaft of the transmission;

a clutch including an outer rotating integrally with the primary driven gear and a clutch center selectively rotatable relative to the clutch outer, said clutch center rotates integrally with the main shaft and is fastened in an axial direction by a fastening member;

a main bearing mounted between the main shaft and a transmission case wall portion, said main bearing including an inner race having an inner side surface and an outer side surface and said main bearing transmitting a thrust load to the transmission case wall portion;

a primary bearing is fastened to an inside of the primary driven gear, and is disposed between the primary driven gear and the main shaft, said primary bearing including an inner race having an inner side surface and an outer side surface with balls of the primary bearing being disposed between the inner race and an outer race of the primary bearing, and said primary bearing being housed in a bearing housing portion on the inside of the primary driven gear by inserting the outer race into an inner wall surface of the bearing housing portion;

a collar member is positioned around the main shaft and between the inner side surface of the inner race of the primary bearing and the outer side surface of the inner race of the main bearing;

a step portion formed on an outer shaft wherein the inner side surface of the inner race of the main bearing is in contact with the step portion;

a cylindrical portion of the clutch center is aligned with the outer side surface of the inner race of the primary bearing being aligned with the collar member, the collar member is positioned around the main shaft and in engagement with the inner side surface of the inner race of the primary bearing and in engagement with the outer side surface of the inner race of the main bearing wherein the cylindrical portion of the clutch center, the inner race of the primary bearing, the collar member and the inner race of the main bearing are aligned adjacent to each other and are fastened to the step portion formed on the outer shaft by fastening the fastening member;

an oil pump drive sprocket having a substantially L-shaped cross section with a large-diameter end portion for engaging a recessed portion in the primary driven gear for rotating the oil pump drive sprocket integrally with the primary driven gear, said oil pump drive sprocket being in engagement with a rib projecting from the collar member to prevent axial displacement and being rotatable relative to the collar member; and

a flange wall extended to an inner side of a shaft diameter is provided on the bearing housing portion, said flange wall extending from the inner wall surface of the bearing housing portion to an inside in a radial direction so as to abut against an inner side surface of the outer race of the primary bearing, the inner side surface of the outer race of the primary bearing being on an opposite side from a side of the clutch.

6. The transmission of the internal combustion engine according to claim 5, wherein:

a damper spring mounted within the clutch center, the damper spring being disposed along a circumferential direction;

a housing portion for housing the damper spring is a swelling portion swelling out to a side of the primary bearing; and

an intra-clutch collar member is mounted around the main shaft on a side of the clutch center where the swelling portion is disposed.

7. A transmission of an internal combustion engine, the transmission comprising:

a primary driven gear for meshing with a primary drive gear mounted on a crankshaft side of an engine, said primary driven gear being rotatable on a main shaft of the transmission;

a clutch including a clutch outer rotating integrally with the primary driven gear and a clutch center selectively rotatable relative to the clutch outer, said clutch center rotates integrally with the main shaft and is fastened in an axial direction by a fastening member;

a main bearing mounted between the main shaft and a transmission case wall portion, said main bearing including an inner race having an inner side surface and an outer side surface and said main bearing transmitting a thrust load to the transmission case wall portion;

the primary drive gear and the primary driven gear being formed as helical gears;

around the main shaft;

a primary bearing is fastened to an inside of the primary driven gear, and is disposed between the primary driven gear and the main shaft, said primary bearing including an inner race having an inner side surface and an outer side surface;

a collar member is positioned around the main shaft and between the inner side surface of the inner race of the primary bearing and the outer side surface of the inner race of the main bearing;

a step portion formed on an outer shaft wherein the inner side surface of the inner race of the main bearing is in contact with the step portion;

a cylindrical portion of the clutch center is aligned with the outer side surface of the inner race of the primary bearing being aligned with the collar member, the collar member is positioned around the main shaft and in engagement with the inner side surface of the inner race of the primary bearing and in engagement with the outer side surface of the inner race of the main bearing wherein the cylindrical portion of the clutch center, the inner race of the primary bearing, the collar member and the inner race of the main bearing are aligned adjacent to each other and are fastened to the step portion formed on the outer shaft by fastening the fastening member;

a damper spring mounted within the clutch center, the damper spring being disposed along a circumferential direction;

a housing portion for housing the damper spring is a swelling portion swelling out to a side of the primary bearing;

an intra-clutch collar member is mounted around the main shaft on a side of the clutch center where the swelling portion is disposed; and

a flange wall extended to an inner side of a shaft diameter is provided on the bearing housing portion, said flange wall extending from the inner wall surface of the bearing housing portion to an inside in a radial direction so as to abut against an inner side surface of the outer race of the primary bearing, the inner side surface of the outer race of the primary bearing being on an opposite side from a side of the clutch.