JP2661667B2 - Clutch device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clutch device incorporated in a transmission system for rotational torque.

[Conventional technology]

In general, a continuously variable transmission that transmits rotation of a drive shaft to a driven shaft via a belt-type continuously variable transmission is used for driving wheels such as a scooter.

By the way, since the belt-type continuously variable transmission transmits torque by friction, slippage occurs between the pulley and the belt at the start of operation, a large torque transmission loss occurs, and the driven gear rotated by the belt-type continuously variable transmission is driven. There is a problem that the rising performance until the shaft reaches the high-speed rotation range is poor.

[Problems to be Solved by the Invention] Therefore, in addition to the belt-type continuously variable transmission, a gear transmission or a chain, a toothed belt or the like is provided separately, and when the driven shaft starts operating, the driven shaft is controlled by the gear transmission and the like. When the driven shaft reaches a predetermined number of rotations, the driven shaft is rotated by a belt-type continuously variable transmission.
The rising performance of the driven shaft can be improved.

In this case, a clutch is incorporated between the output shaft of the belt-type continuously variable transmission and the driven shaft, and between the output shaft of the gear transmission and the driven shaft, and the transmission of the rotational torque to the driven shaft is performed by operating the clutch. You need to switch.

By the way, in the conventional clutch, since it is configured to be operated by external control, a control device is required.

Therefore, the present invention provides a method of mechanically switching between two inputs having different magnitudes or two inputs having different rotational directions output from a belt-type continuously variable transmission, a gear transmission, or the like, without externally controlling the driven. It is a technical object to provide a clutch device that can transmit a force to a shaft.

[Means for solving the problem]

In order to solve the above problems, in the present invention,
The input shaft and the output shaft are disposed relatively to penetrate, and both shafts are rotatably supported by at least two bearings on a clutch outer ring provided outside thereof, and cams are provided on the outer diameter surface of the output shaft and the inner diameter surface of the clutch outer ring. An engaging surface is provided, and between the cam engaging surfaces, a forward rotating cam member that cam-engages with the cam engaging surface during normal rotation of the clutch outer ring and a reverse rotating cam member that engages with the cam engaging surface during reverse rotation. Built-in, having a pocket for storing each cam member,
A retainer incorporated between an output shaft and a clutch outer ring is connected to the input shaft, and a spring that deflects the cam members in a direction in which each cam member engages with a cam engagement surface is incorporated in the pocket, The input shaft and the output shaft are engaged with a clearance in the rotation direction, and the clearance in the rotation direction is larger than the clearance in the rotation direction formed between the pocket wall surface of the retainer and the cam member.

[Action]

With the above configuration, when the clutch outer ring is rotated forward, the normal rotation cam member engages with the cam engagement surface of the clutch outer ring and the output shaft, and conversely, when the clutch outer ring is rotated reversely, the reverse rotation cam member is rotated. It engages with the clutch outer ring and the cam engaging surface of the output shaft. Therefore, the clutch operates in both the forward and reverse directions of the clutch outer ring.

For this reason, if the rotation of the output shaft of the belt-type continuously variable transmission is transmitted to the input shaft of the clutch device and the rotation of the output shaft of the gear transmission is transmitted to the outer ring, the input shaft becomes the output shaft at the start of operation. On the other hand, the input shaft and the output shaft are engaged until the clearance in the rotational direction disappears, and at the same time, the clutch is engaged by the rotation of the outer ring. Therefore, the output shaft is rotated by the input shaft and the clutch outer ring.

When the rotation speed of the output shaft increases and the rotation torque from the input shaft becomes higher than the rotation torque from the clutch outer ring, the output shaft is rotated by the input shaft and the clutch is disengaged. For this reason, rotation from the clutch outer ring is not transmitted to the output shaft,
The output shaft will be rotated by the input shaft, and the input to the output shaft will automatically switch from the clutch outer ring to the input shaft.

Further, when the rotation direction of the input to the input shaft and the rotation direction of the input to the clutch outer ring are reversed, the cam member is pushed in the circumferential direction by the retainer rotating with the input shaft, and the engagement with the cam engagement surface is released. Therefore, the clutch is disengaged, and only the rotation of the input shaft is transmitted to the output shaft. Next, when the drive of the input shaft is stopped, the rotation of the clutch outer ring causes the rotation member to engage with the cam engagement surface, and the clutch is engaged.
The rotation of the clutch outer ring can be transmitted to the output shaft.
At this time, the input shaft is also rotated in the same direction as the output shaft,
If necessary, a one-way clutch should be provided in the torque transmission path of the input shaft.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 and 2 show a first embodiment of a clutch device according to the present invention. This clutch device has an input shaft 1
A cylindrical output shaft 2 is fitted on the outside of the shaft. The input shaft 1 has an axial ridge 3 on an outer diameter surface at a position where the output shaft 2 is fitted.
The protrusion 3 is inserted into an axial engagement groove 4 formed on the inner diameter surface of the output shaft 2, and a clearance A in the rotational direction is provided between the protrusion 3 and the outer surface of the engagement groove 4.

An assembly member of the input shaft 1 and the output shaft 2 is rotatably supported on the clutch outer ring 6 via two bearings 5. A gear 7 is provided on the outer diameter surface of the clutch outer ring 6, and a cam engaging surface 8 formed of a cylindrical surface is provided on the inner diameter surface.
On the other hand, on the outer diameter surface of the output shaft 2, a flat cam engaging surface 9 that is orthogonal to a straight line perpendicular to the axis is formed, and the cam engaging surface 9 and the cam engaging surface of the clutch outer ring 6 are formed. A cam member 10 'for forward rotation and a cam member 10' for reverse rotation composed of a pair of rollers are incorporated between them.

Each of the forward rotation cam member 10 ′ and the reverse rotation cam member 10 ″ is housed in a pocket 12 of a retainer 11 connected to the input shaft 1 and incorporated inside the clutch outer ring 6, and incorporated in the pocket 12. The spring 13 is pressed in the opposite direction to engage the cam engaging surface 8 of the clutch outer race 6 and the cam engaging surface 9 of the output shaft 2. The cam members 10 ', 10 "and the pocket in the engaged state are engaged. A clearance B is formed between the input shaft 1 and the output shaft 2 in the rotational direction. A clearance B is formed between the input shaft 1 and the output shaft 2 in the rotational direction.

 Reference numeral 14 denotes a gear attached to the output shaft 2.

The clutch device shown in the first embodiment has the above configuration. This clutch device is used, for example, when mechanically switching between two inputs of a belt-type continuously variable transmission and a gear transmission to transmit the input to a driven shaft. Used. In this case, the rotation of the output shaft of the belt-type continuously variable transmission is transmitted to the input shaft 1, the rotation of the output shaft of the gear transmission is transmitted to the clutch outer ring 6, and the driven shaft is connected to the output shaft 2. Further, the output shaft of the belt-type continuously variable transmission is rotated at a high speed by the output shaft of the output shaft of the gear transmission.

Now, when the operation of the belt-type continuously variable transmission and the gear transmission is started and the input shaft 1 and the clutch outer ring 6 are rotated forward (in the direction of the arrow in FIG. 2), as shown in FIG.
The ridge 3 of the input shaft 1 engages with the side surface of the engagement groove 4 and the output shaft 2
Try to rotate. At this time, since the output shaft 2 has a load, the load causes the belt of the belt-type continuously variable transmission that imparts rotation to the input shaft 1 and the input shaft 1
Therefore, the output shaft 2 cannot be rotated sufficiently.

On the other hand, the rotation of the clutch outer ring 6 causes the cam member for normal rotation to rotate.
10 'engages the clutch outer ring 6 and the cam engaging surface 9 of the output shaft 2 shown in FIG. 3, and the clutch is engaged.

Therefore, the rotation of the clutch outer ring 6 is controlled by the forward rotation cam member.
The output shaft 2 is transmitted to the output shaft 2 via 10 ′, and the output shaft 2 is rotated by the clutch outer ring 6 and the input shaft 1 and at the same speed as the rotation speed of the clutch outer ring 6.

When the rotation speed of the output shaft 2 increases and the rotation torque from the input shaft 1 exceeds the rotation torque from the clutch outer ring 6, the output shaft 2 is rotated by the input shaft 1. At this time, since the output shaft 2 rotates in advance with respect to the clutch outer ring 6, the forward rotation cam member 10 'slides on the cam engaging surface 8 of the clutch outer ring 6, and the clutch is disengaged. On the other hand, the wall surface of the pocket 12 of the retainer 11, which rotates together with the input shaft 1, pushes the reverse rotation cam member 10 ″ toward the release position as shown in FIG.
The rotation of the clutch outer ring 6 is not transmitted to the output shaft 2, and the output shaft 2 rotates at the same speed as the input shaft 1, and the input to the output shaft 2 is automatically switched.

The usage example of the clutch device according to the present invention is not limited to this, and may be used, for example, when the output shaft 2 is rotated forward and reverse by two inputs having different rotation directions.

When the input shaft 1 and the clutch outer ring 6 are rotated in opposite directions, the wall surface of the pocket 12 of the retainer 11 that rotates together with the input shaft 1 presses the cam member on the front side in the rotation direction in the circumferential direction, so that the clutch is disengaged. Since the ridge 3 is engaged with the side surface of the engagement groove 4, only the rotation of the input shaft 1 is transmitted to the output shaft 2. Then, when the rotation transmission to the input shaft 1 is interrupted and the input shaft 1 is stopped, the rotation of the clutch outer ring 6 causes
The cam member engages with the cam engagement surfaces 8, 9 and the clutch is engaged. For this reason, the rotation of the clutch outer ring 6 causes the cam engagement surface 8,
The output shaft 2 is transmitted to the output shaft 2 via a cam member engaged with the output shaft 9, and the output shaft 2 rotates in a direction opposite to the above. At this time, ridge 3
Since the input shaft 1 is also rotated in the same direction by the engagement of the engagement groove 4 and the engagement groove 4, a one-way clutch or the like is incorporated in a torque transmission path to the input shaft 1 so as not to hinder rotation.

FIG. 4 and FIG. 5 show a second embodiment of the clutch device according to the present invention.

In this clutch device, a flat cam engagement surface 8 'is provided on the inner diameter surface of the clutch outer ring 6, and a cam engagement surface 9' formed of a cylindrical surface is formed on the outer diameter surface of the output shaft 2, thereby forming a cam engagement surface. 8 ',
The formation position of 9 'is reverse to that of the first embodiment.
Other configurations and operations are the same as those of the first embodiment.

6 and 7 show a third embodiment of the clutch device according to the present invention. In this clutch device, the cam engagement surfaces 8 "and 9" formed on the clutch outer ring 6 and the inner diameter surface and the outer diameter surface of the output shaft 2 are cylindrical surfaces.

Further, a plurality of pockets 12 provided in the circumferential direction of the retainer 11 are provided.
Further, a forward rotation cam member 20 'and a reverse rotation cam member 20 "formed of eyebrow sprags are alternately accommodated, and the respective cam members 20', 2 '
In the pocket 12, a spring 13 'for deflecting the cam members 20', 20 "in a direction in which 0" engages with the output shaft 2 and the cam engaging surfaces 8 ", 9" of the clutch outer ring 6 is incorporated. Other configurations and operations are the same as those of the first embodiment.

As described above, when the eyebrows are used as the cam members 20 'and 20 ", the cam engagements 8" and 9 "of the clutch outer ring 6 and the output shaft 2 can be formed into cylindrical surfaces, so that machining is easy. Yes, cost can be reduced.

8 and 9 show a third embodiment of the clutch device according to the present invention. This clutch device has an input shaft 1
And the output shaft 2 is inserted inside the input shaft 1 so that the arrangement of the input shaft 1 and the output shaft 2 is opposite to that of the first embodiment. And output shaft 2
Are provided with engaging grooves 4 on the outer diameter surface.

Further, a retainer 11 is provided integrally with the input shaft 1, and the retainer 11 is provided.
A forward rotation cam member 10, a 'reverse rotation cam member 10 ″ and each of the cam members 10 ′, 10 ″ are engaged with the clutch outer ring 6 and the cam engagement surfaces 8, 9 of the output shaft 2 in a pocket 12 provided in the 11. The spring 13 is incorporated.

Further, the input shaft 1 is provided with a gear 15 for transmitting the rotation of the output shaft of the belt-type continuously variable transmission. Other configurations and operations are the same as those of the first embodiment.

〔The invention's effect〕

Since the present invention is configured as described above, two inputs having the same rotation direction but different rotation speeds or two inputs having different rotation directions are mechanically switched without being externally controlled and transmitted to the driven shaft. Can be enabled. In addition, the input shaft and the output shaft are disposed so as to penetrate each other, and the input shaft and the output shaft are rotatably mounted on the outer ring of the clutch by two bearings. Can be supported with high rigidity.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view showing a first embodiment of a clutch device according to the present invention, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, and FIG. Enlarged sectional view showing,
FIG. 4 is a longitudinal sectional front view showing a second embodiment of the clutch device of the above, FIG. 5 is a sectional view taken along the line V--V of FIG. 4, and FIG. FIG. 7 is a longitudinal sectional front view showing an example, FIG. 7 is a sectional view taken along the line VII-VII of FIG.
FIG. 9 is a longitudinal sectional front view showing a fourth embodiment of the clutch device, and FIG. 9 is a sectional view taken along line IX-IX in FIG. 1 ... input shaft, 2 ... output shaft, 5 ... bearing, 6 ... clutch outer ring, 8, 8 ', 8 "... cam engaging surface, 9, 9', 9" ... cam engaging surface , 10, '20' ... forward rotation cam member, 10 ", 20" ... reverse rotation cam member, 11 ... cage, 12 ... pocket, 13 ... spring, A / B ... rotational direction clearance .

Claims (1)

(57) [Claims] An input shaft and an output shaft are relatively penetrated, and both shafts are rotatably supported by at least two bearings on a clutch outer ring provided outside thereof, and an outer diameter surface of the output shaft and a clutch outer ring are provided. A cam engaging surface is provided on the inner diameter surface of the clutch, and a forward rotation cam member that engages with the cam engaging surface during normal rotation of the clutch outer ring between the cam engaging surface and a cam engaging surface with the cam engaging surface during reverse rotation. A cam member for reverse rotation is incorporated, a pocket for accommodating each cam member is provided, and a retainer incorporated between an output shaft and an outer ring of a clutch is connected to the input shaft. A spring for deflecting the cam member in a direction to engage with the engagement surface is incorporated, the input shaft and the output shaft are engaged with a clearance in the rotation direction, and the clearance in the rotation direction is set between the pocket wall surface of the retainer and the cam member. Larger than the clearance formed in the rotation direction Clutch apparatus.