JPH0143860B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention causes a stepping member on the annular inner circumferential surface of a casing to perform stepping motion by the cam action of an eccentrically rotating rotating body. Based on the above, the present invention relates to a transmission which extracts output torque after shifting to the output shaft side.

Conventionally, in a transmission with a mechanical structure,
In order to achieve continuously variable speed over the entire speed range, a friction transmission section was generally required, but since the friction members in such a friction transmission section were subject to severe wear, the friction transmission section was no longer necessary. There was a desire for a transmission that would prevent this from happening. Further, in order to expand the applications of the transmission, it is desirable that the input shaft and the output shaft are arranged concentrically, and furthermore, it is desirable that the transmission can be easily changed even during operation.

Therefore, the main object of the present invention is basically to be able to perform continuously variable speed over the entire speed range without requiring a friction transmission part, and to have an input shaft and an output shaft that are concentric. To obtain a transmission that allows easy gear shifting operations even during driving.

According to the present invention, the link mechanism disposed in the annular space between the rotating body and the casing repeats periodic reciprocating motion due to the cam action of the eccentrically rotating rotating body. The periodic reciprocating motion of the link mechanism causes a step motion in the link mechanism, and the step motion of the link mechanism rotates the output shaft. By receiving torque transmission through the link mechanism, it rotates almost smoothly.

An embodiment of the present invention will be described below with reference to the drawings.

A casing 1 of the transmission A includes a cylindrical body 2,
It has a small diameter part 3 having a smaller diameter than this body part 2, and an annular end wall part 4 screwed to the body part 2, and the small diameter part 3 has:
It is fixed to the output side end wall 6 of the motor 5 by fixing means such as bolts. A male thread 7 is formed on the outer peripheral surface of the small diameter portion 3.
A speed change operation ring 9 having an annular groove 8 and a female thread formed on the inner circumferential surface thereof is screwed into the gear shift operation ring 9 . A sliding ring 10 is fitted into the inner circumferential surface of the small diameter portion 3 via a seal member 11 so as to be able to freely slide in the axial direction, and the base end portion is fixed to the outer circumferential surface of the sliding ring 10. The pin 12 slidably passes through an axial groove 13 formed in the small diameter portion 3 and protrudes radially outward, and is slidably engaged with the annular groove 8 of the speed change operation ring 9 at its tip end. It's in.

A base end portion of an input shaft 16 is rotatably supported on the inner peripheral surface side of the sliding ring 10 via a bearing 14 and a seal member 15 . An engagement hole 17 that is open toward the base end surface is formed at the base end of the input shaft 16, and a spline 19 is formed in the engagement hole 17.
The output shaft 18 of the motor 5 is spline-fitted therebetween.

The input shaft 16 has an inclined angle shaft portion 2 in order toward the tip.
0 and a tip shaft portion 21, and this tip shaft portion 21
A bearing 2 is installed on the inner peripheral surface side of the end wall 4 of the casing 1.
A bearing 2 is inserted into a fitting hole 25 formed on the inner end side of an output shaft 24 which is supported via a seal member 23 and a bearing 2.
It is pivotally supported via 6. The output shaft 18 of the motor 5, the base end portion of the input shaft 16 of the transmission A, the tip shaft portion 21 of the input shaft 16, and the output shaft 24 are arranged in a straight line on a common rotation center line C. .

The inclined shaft portion 20 has a rectangular cross section,
The center line intersects the rotation center line C by an angle θ. The inclined shaft portion 20 includes a pair of dividing members 27 divided by an axial dividing surface.
An eccentric response body 27 consisting of a and 27b is fitted in a slidable manner. This eccentric response body 27 forms a cylindrical outer circumferential surface around a center line parallel to the rotation center line C in a state fitted to the inclined angle shaft portion 20,
A bearing 28 is fitted onto this outer peripheral surface. The eccentric response body 27 includes a bearing 26 and an annular movement suppressing plate 2 disposed inside the body 2 of the casing 1.
9, and is held in such a manner that it cannot be moved in the axial direction so as to be slidably connected thereto.

Therefore, when the input shaft 16 is rotationally driven by the output shaft 18 of the motor 5, the eccentric response body 27
The pin 12 rotates together with the input shaft 16, and as the speed change operation ring 9 is rotated, the pin 12 is inserted into the axial groove 1.
3 and, as a result, when the sliding ring 10 and the input shaft 16 move in the axial direction, the inclined angle shaft portion 20
It shifts in the radial direction under the action of , and performs eccentric rotation according to the eccentricity E from the rotation center line C at that time. At this time, the eccentricity E can continuously change from zero to the maximum value.

A flange 30 is integrally formed at the inner end of the output shaft 24, and a plurality of torque transmission shafts 31, for example, three torque transmission shafts 31 as shown in the figure, are mounted on the flange 30 at regular intervals in the circumferential direction. , 32, 33 are fixed. Each torque transmission shaft 31, 32,
33 protrudes toward the movement suppressing plate 29 parallel to the rotation center line C of the input shaft 16, and bearings 35, 36, 37 are fitted into the protruding portions of each of these torque transmission shafts 31, 32, 33, respectively. are doing. The outer peripheral surface of each of these bearings 35, 36, 37 is
It is inscribed in the inner circumferential surface 34 of the body 2 of.

The link mechanism 47 associated with the torque transmission shaft 33 will be described below, but a link mechanism having exactly the same structure as this link mechanism 47 is arranged in relation to the other torque transmission shafts 31 and 32. FIG. 3 shows a link mechanism 47 associated with the torque transmission shaft 33 as an exploded perspective view.

One end portion of a pair of link members 38, 38' is pivotally supported on the protrusion of the torque transmission shaft 33 with a bearing 37 in between, and each of these link members 38, 38'
The other end of 38' is pivotally supported by a pivot shaft 40.
This pivot shaft 40 includes a pair of link members 38, 3.
A bearing 39 is pivotally supported so as to be sandwiched between the two link members 8', and two proximal prongs of the rocking body 41 are pivotally supported so as to sandwich the pair of link members 38, 38' from the outside. There is. The tip edge of the rocking body 41 has a concave groove 4 parallel to the rotation center line C of the stepping member 42.
3, a spring seat on an arm 44 protruding from a pair of link members 38, 38', and a spring seat 45 held on the shoulder of the stepping member 42; A resilient spring 46 is interposed between them. Due to the action of this resilient spring 46, the pivot shaft 40
is always receiving an elastic force toward the outer circumferential surface of the eccentric response body 27, and as a result, the outer circumferential surface of the bearing 39 is always in pressure contact with the outer circumferential surface of the bearing 28.

The stepping member 42 is slidable in the circumferential direction along the inner circumferential surface 34 of the body 2 of the casing 1, and receives a force from the rocking body 41 to move clockwise in FIG. The spring 46 receives a force that tends to move counterclockwise in FIG. 2, but since the spring force of the spring 46 is set to be sufficiently large, it is always possible to move clockwise in FIG. Deterred.

When the eccentricity of the eccentric response body 27 is zero, the pivot shaft 40 does not swing at all, and therefore no force in the circumferential direction acts on the torque transmission shaft 33, so that no torque is transmitted to the output shaft 24. Not done. However, when the eccentric response body 27 rotates eccentrically, the pivot shaft 40 along with the oscillating body 41 oscillates around the oscillating center line of the distal end edge that is engaged with the groove 43 of the oscillating body 41. move. At this time, the pivot shaft 40 is aligned with the rotation center line C.
When swinging in the direction away from the stepping member 4
2 functions as a stopper due to the action of the elastic spring 46, the torque transmission shaft 33 receives a force that tries to move in the circumferential direction and moves counterclockwise in FIG. 2, and as a result, the output axis 24
rotates counterclockwise in FIG. At this time, the bearing 37 is inscribed in the inner circumferential surface 34 of the body 2 of the casing 1, so that the torque transmission shaft 3
Although counterclockwise movement is facilitated in FIG. 3 of FIG. 3, in some embodiments bearing 37 is not necessarily required. The amount of movement of the torque transmission shaft 33 increases as the amount of eccentricity E of the eccentric response body 27 increases.

When the pivot shaft 40 swings in a direction approaching the rotation center line C, among the torque transmission shafts 31 and 32 adjacent to the torque transmission shaft 33, the torque transmission shaft adjacent to the input shaft 16 in the rotational direction Since the output shaft 24 is receiving a counterclockwise force in FIG. 2 through the link mechanism, the output shaft 24 continues to receive a torque that tends to rotate counterclockwise in FIG. Due to the restoring force of the resilient spring 46, it approaches the torque transmission shaft 33.

In order for the output shaft 24 to always receive rotational torque,
Torque transmission shafts 31, 32, 33 and link mechanisms 4 attached to these torque transmission shafts 31, 32, 33
At least a plurality of sets of 7 are required at equal intervals from each other. The rotation direction of the input shaft 16 is not particularly limited, but in order to ensure smooth torque transmission,
It is preferable that the output shaft 24 rotates in the direction in which it rotates, that is, in the counterclockwise direction in FIG. The output shaft 24 has a flange 30, and this flange 30 promotes smooth rotation of the output shaft 24 by also functioning as a flywheel.

The eccentricity E of the eccentric responsive body 27 is continuously changed by moving the input shaft 16 in the axial direction.
The movement in the axial direction is performed by rotationally operating the speed change operation ring 9. The eccentric rotation of the eccentric response body 27 is caused by the link mechanism 4 attached to the torque transmission shaft 33.
The deceleration rotational movement of the output shaft 24 is caused through the link movement of a link mechanism similar to the link mechanism 47 attached to the torque transmission shaft 7 and the other torque transmission shafts 31 and 32, respectively. At this time, when the eccentricity E of the eccentric response body 27 is zero, the output shaft 24 does not rotate, and the eccentric response body 27
As the eccentricity E of 7 increases, the output shaft 24
The rotation speed also increases continuously, and the gear ratio decreases.

As described above, according to the present invention, the axial movement of the input shaft continuously changes the eccentricity of the eccentric response body, and the eccentric rotation of the eccentric response body is caused by the movement of the input shaft in the axial direction. Since deceleration rotation of the output shaft is caused through the link movement of the link mechanism including the elastic spring, there is little wear on the parts, and continuous speed change can be performed smoothly over the entire speed change range, and the input shaft and output shaft are Since the input shaft and output shaft are arranged concentrically, it can be used for a wide range of applications.The axial movement of the input shaft is controlled by the casing. Since the transmission can be operated from the outside, a transmission can be obtained that allows the gear change operation to be easily performed even during rotational driving.

[Brief explanation of drawings]

FIG. 1 is a partially cut away vertical sectional view of a transmission according to an embodiment of the present invention, FIG. 2 is a transverse sectional view taken along the line - in FIG. 1, with the same structural parts omitted; FIG. 3 is an exploded perspective view of the link mechanism. 1...Casing, 16...Input shaft, 24...
Output shaft, 27... Eccentric response body, 30... Flange, 31, 32, 33... Torque transmission shaft, 38,
38'...link member, 40...pivot shaft, 41...
... Rocking body, 42 ... Stepping member, 44 ... Arm, 46
...Bullet spring.

Claims (1)

[Claims] 1 an input shaft 16 rotatably supported by the casing 1 and movable in the axial direction with respect to the casing 1 by being operated from outside the casing 1; An eccentric responsive body 27 is fitted to the input shaft 16 and has a cylindrical outer peripheral surface whose eccentricity changes as the input shaft 16 moves in the axial direction; A flange 3 is provided at the end inside the casing 1.
0, and in this flange 30, a plurality of torque transmission shafts 31,
32, 33, and one end thereof is pivotally supported by each of the torque transmission shafts 31, 32, 33,
Link members 38, 38' whose other ends are pivotally supported by a pivot shaft 40 located on a constant side with respect to each of the torque transmission shafts 31, 32, 33 along the outer peripheral surface of the eccentric response body 27. and one end side is connected to each of the pivot shafts 4.
0 and whose other end side is pivoted by a stepping member 42 that can move in the circumferential direction on the annular inner peripheral surface of the casing 1; It is interposed between an arm 44 protruding from the link members 38, 38', and springs the pivot shaft 40 toward the outer circumferential surface of the eccentric response body 27, as well as the stepping member 42. A transmission equipped with a resilient spring 46 that suppresses movement in the opposite direction.