Power unit for saddle-type vehicle

Patent metadata

Field	Value
Publication number	US-9664255-B2
Application number	US-201414225581-A
Country	US
Kind code	B2
Filing date	Mar 26, 2014
Priority date	Mar 29, 2013
Publication date	May 30, 2017
Grant date	May 30, 2017

Abstract

In a power unit for a saddle-type vehicle a locking pin on a shift drum side is fixed to a shift spindle and a detection shaft of a shift position sensor is interlocked and connected with the shift drum, the friction surface between the shift arm and the locking pin is reduced with suppression of the lowering of the rigidity of the shift arm to enable smooth gear shifting. An engagement hole in a shift arm allows insertion and engagement of a locking pin and has an elongated hole shape extending along one diameter line of a shift spindle. An insertion hole in the shift arm has an arc shape centered at the center axis line of the shift spindle to allow insertion of an interlocking shaft coaxially connected to the shift drum to be incapable of rotation relative to it.

First claim

What is claimed is:

1. A power unit for a saddle vehicle wherein:
gear trains of a plurality of shift stages one of which is selectively established according to rotation of a shift drum are provided in a power train system between a drive source that exerts a driving force and a drive wheel;
a change mechanism that rotates the shift drum includes a shift spindle that rotates according to input of a gear shifting operating force and a shift arm that engages with a locking pin provided on a side of the shift drum and is fixed to the shift spindle; and
a detection shaft of a shift position sensor for detecting a rotational position of the shift drum is interlocked and connected with the shift drum;
the power unit for a saddle vehicle comprising:
an interlocking shaft for interlocking and connecting the detection shaft of the shift position sensor is connected to the shift drum in such a manner so as to be coaxial with a rotational axis line of the shift drum and is incapable of rotation relative to the shift drum;
in the shift arm, an engagement hole is formed having an elongate hole shape extending along one diameter line of the shift spindle in such a manner so as to allow insertion and engagement of the locking pin and an insertion hole is formed extending into an arc shape centered at a center axis line of the shift spindle in such a manner so as to allow insertion of the interlocking shaft;
at least a part penetrating through the insertion hole in the interlocking shaft is formed with a diameter smaller than a diameter of the locking pin and a width of the insertion hole is set smaller than a width of the engagement hole; and
a second engagement pin, fitted into an engagement recess, is formed at an end part of a joint component on the side of the shift position sensor and is located on one diameter line of the joint component said second engagement pin is provided in parallel to a first engagement pin fitted into the engagement groove provided on the joint component connected to the detection shaft in such a manner so as to be incapable of rotation relative to the detection shaft.

2. The power unit for a saddle vehicle according to claim 1 , wherein the engagement hole is formed so as to continue to a longitudinally center part of the insertion hole and extend to an opposite side to the shift spindle.

3. The power unit for a saddle vehicle according to claim 2 , wherein the interlocking shaft is formed so that a part on the side of the shift drum is larger in diameter than the part inserted in the insertion hole.

4. The power unit for a saddle vehicle according to claim 2 , wherein a pawl ratchet mechanism having a cup-shaped rotating component that rotates together with the shift drum and a shifter assembly that has the locking pin and is rotatably housed in the rotating component is provided between the shift arm and the shift drum in such a manner so as to convert one round of reciprocal rotation of the shift spindle and the shift arm to rotation of the shift drum by a predetermined angle; and
the interlocking shaft penetrating the shifter assembly in such a manner so as to rotatably support the shifter assembly is press-fitted into the rotating component fixed to the shift drum.

5. The power unit for a saddle vehicle according to claim 2 , wherein a pawl ratchet mechanism having a cup-shaped rotating component that rotates together with the shift drum and a shifter assembly that has the locking pin and is rotatably housed in the rotating component is provided between the shift arm and the shift drum in such a manner so as to convert one round of reciprocal rotation of the shift spindle and the shift arm to rotation of the shift drum by a predetermined angle; and
the interlocking shaft is coaxially press-fitted to a bolt that penetrates the shifter assembly in such a manner so as to rotatably support the shifter assembly and fastens the rotating component to the shift drum.

6. The power unit for a saddle vehicle according claim 2 , wherein an engagement groove is formed extending into a straight line shape in such a manner so that both ends are opened at outer circumference of the interlocking shaft at an axial end of the interlocking shaft on a side of the shift position sensor.

7. The power unit for a saddle vehicle according to claim 1 , wherein the interlocking shaft is formed so that a part on the side of the shift drum is larger in diameter than the part inserted in the insertion hole.

8. The power unit for a saddle vehicle according to claim 7 , wherein a pawl ratchet mechanism having a cup-shaped rotating component that rotates together with the shift drum and a shifter assembly that has the locking pin and is rotatably housed in the rotating component is provided between the shift arm and the shift drum in such a manner so as to convert one round of reciprocal rotation of the shift spindle and the shift arm to rotation of the shift drum by a predetermined angle; and
the interlocking shaft penetrating the shifter assembly in such a manner so as to rotatably support the shifter assembly is press-fitted into the rotating component fixed to the shift drum.

9. The power unit for a saddle vehicle according claim 7 , wherein an engagement groove is formed extending into a straight line shape in such a manner so that both ends are opened at outer circumference of the interlocking shaft at an axial end of the interlocking shaft on a side of the shift position sensor.

10. The power unit for a saddle vehicle according to claim 1 , wherein a pawl ratchet mechanism having a cup-shaped rotating component that rotates together with the shift drum and a shifter assembly that has the locking pin and is rotatably housed in the rotating component is provided between the shift arm and the shift drum in such a manner so as to convert one round of reciprocal rotation of the shift spindle and the shift arm to rotation of the shift drum by a predetermined angle; and
the interlocking shaft penetrating the shifter assembly in such a manner so as to rotatably support the shifter assembly is press-fitted into the rotating component fixed to the shift drum.

11. The power unit for a saddle vehicle according claim 10 , wherein an engagement groove is formed extending into a straight line shape in such a manner so that both ends are opened at outer circumference of the interlocking shaft at an axial end of the interlocking shaft on a side of the shift position sensor, and an engagement pin fitted into the engagement groove is provided on a joint component connected to the detection shaft in such a manner so as to be incapable of rotation relative to the detection shaft.

12. The power unit for a saddle vehicle according to claim 1 , wherein a pawl ratchet mechanism having a cup-shaped rotating component that rotates together with the shift drum and a shifter assembly that has the locking pin and is rotatably housed in the rotating component is provided between the shift arm and the shift drum in such a manner so as to convert one round of reciprocal rotation of the shift spindle and the shift arm to rotation of the shift drum by a predetermined angle; and
the interlocking shaft is coaxially press-fitted to a bolt that penetrates the shifter assembly in such a manner so as to rotatably support the shifter assembly and fastens the rotating component to the shift drum.

13. The power unit for a saddle vehicle according claim 12 , wherein an engagement groove is formed extending into a straight line shape in such a manner so that both ends are opened at outer circumference of the interlocking shaft at an axial end of the interlocking shaft on a side of the shift position sensor

Assignees

• Honda Motor Co Ltd

Inventors

• Sugano Takeshi
• Tsubakino Yukihiro

Classifications

• 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

• F16H2200/0052

  the gear ratios comprising six forward speeds · CPC title

• F16H3/02 Primary

  without gears having orbital motion · CPC title

• F16H2200/003

  characterised by the number of forward speeds · CPC title

• F16H63/18 Primary

  the final actuating mechanism comprising cams · CPC title