Vibration isolating structure for power unit

Patent metadata

Field	Value
Publication number	US-9664272-B2
Application number	US-201414223210-A
Country	US
Kind code	B2
Filing date	Mar 24, 2014
Priority date	Mar 28, 2013
Publication date	May 30, 2017
Grant date	May 30, 2017

Abstract

A vibration isolating structure for a power unit. The power unit includes an internal combustion engine equipped with transmissions. The vibration isolation structure includes torque dampers disposed between transmission gears of the transmission and a power transmission shaft supporting the transmission gears.

First claim

We claim:

1. A power unit comprising:
an internal combustion engine;
a transmission configured to transmit rotational driving force of the internal combustion engine; and
a vibration isolating structure,
wherein the vibration isolating structure comprises torque dampers, and
wherein the torque dampers are configured to be disposed between a transmission gear of the transmission and a power transmission shaft supporting the transmission gear,
wherein the power unit further comprises mutually rotatable intermediate rotational members,
wherein the transmission gear comprises a forwardly opening recess, and the intermediate rotational members comprise a rearwardly opening arcuate recess,
wherein the forwardly opening recess faces respectively to the rearwardly opening arcuate recess,
wherein the torque dampers are interposed in a bridging manner within and between both the mutually facing forwardly opening recess and the rearwardly opening arcuate recess,
wherein the mutually rotatable intermediate rotational members are configured to be interposed between the transmission gear and the power transmission shaft supporting the transmission gear, and
wherein the vibration isolating structure further comprises a cam torque dampener disposed between the power transmission shaft and one of the intermediate rotational members.

2. The power unit according to claim 1 , further comprising:
a clutch device configured to be disposed between the internal combustion engine and the transmission; and
a clutch damper configured to be disposed on an input side of the clutch device.

3. A power unit comprising:
an internal combustion engine;
a transmission configured to transmit rotational driving force of the internal combustion engine; and
a vibration isolating structure,
wherein the vibration isolating structure comprises torque dampers, and
wherein the torque dampers are configured to be disposed between a transmission gear of the transmission and a power transmission shaft supporting the transmission gear,
wherein the power unit further comprises mutually rotatable intermediate rotational members,
wherein the transmission gear comprises a forwardly opening recess, and the intermediate rotational members comprise a rearwardly opening arcuate recess,
wherein the forwardly opening recess faces respectively to the rearwardly opening arcuate recess, and
wherein the torque dampers are interposed in a bridging manner within and between both the mutually facing forwardly opening recess and the rearwardly opening arcuate recess,
wherein the mutually rotatable intermediate rotational members are configured to be interposed between the transmission gear and the power transmission shaft supporting the transmission gear,
wherein the intermediate rotational members are configured to be supported on the power transmission shaft,
wherein the torque dampers comprise a cam torque damper configured to be disposed between the power transmission shaft and the intermediate rotational members, and
wherein the torque dampers further comprise damper springs configured to be disposed between the intermediate rotational members and the transmission gear.

4. The power unit according to claim 3 ,
wherein the transmission gear is a transmission driven gear of a pair of a transmission driving gear and the transmission driven gear meshed with each other.

5. The power unit according to claim 3 ,
wherein the damper springs are configured to be arranged in plurality along a circumferential direction.

6. The power unit according to claim 3 ,
wherein the damper springs are configured to be disposed at a spoke part of the transmission gear in the surroundings of the power transmission shaft, and
wherein the damper springs are configured to be interposed between the transmission gear and the intermediate rotational members.

7. The power unit according to claim 3 , further comprising:
a second transmission gear,
wherein a second damper spring is interposed between the second transmission gear and the intermediate rotational members.

8. A power unit comprising:
an internal combustion engine;
a transmission configured to transmit rotational driving force of the internal combustion engine;
a vibration isolating structure,
wherein the vibration isolating structure comprises torque dampers,
wherein the torque dampers are configured to be disposed between a transmission gear of the transmission and a power transmission shaft supporting the transmission gear,
wherein the power unit further comprises mutually rotatable intermediate rotational members configured to be interposed between the transmission gear and the power transmission shaft supporting the transmission gear, the intermediate rotational members configured to be supported on the power transmission shaft,
wherein the torque dampers comprise a cam torque damper configured to be disposed between the power transmission shaft and the intermediate rotational members,
wherein the torque dampers further comprise damper springs configured to be disposed between the intermediate rotational members and the transmission gear,
wherein the damper springs are configured to be disposed between the transmission gear and the intermediate rotational members,
wherein the damper springs are configured to be arranged in plurality along a circumferential direction, and wherein the damper springs comprise damper springs different in spring characteristics, the different damper springs being mixedly present.

9. A power unit comprising:
an internal combustion engine;
a transmission configured to transmit rotational driving force of the internal combustion engine; and
a vibration isolating structure,
wherein the vibration isolating structure comprises torque dampers, and
wherein the torque dampers are configured to be disposed between a transmission gear of the transmission and a power transmission shaft supporting the transmission gear,
wherein the power unit further comprises mutually rotatable intermediate rotational members,
wherein the transmission gear comprises a forwardly opening recess, and the intermediate rotational members comprise a rearwardly opening arcuate recess,
wherein the forwardly opening recess faces respectively to the rearwardly opening arcuate recess,
wherein the torque dampers are interposed in a bridging manner within and between both the mutually facing forwardly opening recess and the rearwardly opening arcuate recess,
wherein the power unit further comprises a clutch device configured to be disposed between the internal combustion engine and the transmission, a clutch damper configured to be disposed on an input side of the clutch device, a main transmission output shaft of a main transmission, and a sub transmission input shaft of a sub transmission,
wherein the main transmission output shaft and the sub transmission input shaft are in spline fit to each other,
wherein the transmission further comprises the main transmission on an upstream side with respect to power transmission,
wherein the transmission further comprises the sub transmission on a downstream side with respect to the power transmission, and
wherein the transmission gear is configured to be disposed with the torque dampers, and is the transmission gear of the sub transmission.

10. A power unit comprising:
an internal combustion engine means for generating motive power;
a transmission means for transmitting rotational driving force of the internal combustion engine means; and
a vibration isolating means for suppressing torque variations,
wherein the vibration isolating means comprises torque damper means for damping torque variations, and
wherein the torque dam

Assignees

• Honda Motor Co Ltd

Inventors

• Kudo Takashi
• Mitsubori Toshimasa
• Sumi Hiromi

Classifications

• F16H57/0006

  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 title

• Y10T74/19633

  Yieldability in gear trains · CPC title

• F16H3/08

  exclusively or essentially with continuously meshing gears, that can be disengaged from their shafts · CPC title

• F16H55/14 Primary

  Construction providing resilience or vibration-damping (F16H55/06 takes precedence) · CPC title