JP2019190509A - Rotation transmission mechanism and bicycle including the same - Google Patents

Abstract

To provide a rotation transmission mechanism capable of realizing a bicycle or the like more excellent in usability than before.SOLUTION: A rotation transmission mechanism 1 is provided with: an internal rotary member 3 comprising an internal rotary member body 3a, and an elastically-deformable long body 3g whose base end is attached to the inner rotary member main body 3a, and distal end is locked to an external rotary member 4; and the external rotary member 4 comprising an annular part 4b rotatably disposed on the internal rotary member 3 on the outer peripheral side with respect to the inner rotary member 3, and a protrusion part 4c protruding from the inner peripheral surface of the annular part 4b in the center direction of the annular part 4b. The base end of the long body 3g is rotates with the rotation of the internal rotary member 3 when the internal rotary member 3 and the external rotary member 4 are relatively rotated, and then the long body is elastically deformed until a projection part 3f of the internal rotary member 3 comes into contact with the protrusion part 4c of the external rotary member 4.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a rotation transmission mechanism, and more particularly to a rotation transmission mechanism used by being mounted on a rotation shaft such as a crankshaft of a bicycle.

In the case of a bicycle that rotates wheels by human power, once it starts running, it can run with a small force, but when starting, accelerating, starting climbing such as climbing, it receives a particularly large repulsive force, and part of the input energy However, it bounced back to the knees, ankles, and hips as an impact, generating not only a heavy load on the human body, but also not being able to use the input energy efficiently, leading to a reduction in propulsive force. And when suddenly starting, accelerating, climbing steep hills, and when the weight of the bicycle driver or the load is heavy, the load (drag) on the human body becomes particularly large, The required energy has also increased.
In the case of a bicycle, since the vertical motion of the foot is converted into a rotational motion by the crank, it is difficult to smoothly transmit the leg force particularly at the top dead center and the bottom dead center, which causes an increase in the burden on the knee and ankle, In the case of running at a low speed because the torque is interrupted and the speed is lowered, there is a problem that the wobbling is likely to occur and the running stability is lowered.

  Therefore, in order to solve the above problems, the present inventor has an inner rotating member and an outer rotating member, and between the two blades engaged, the outer peripheral surface of the inner rotating member, the inner peripheral surface of the outer rotating member, and A rotation transmission mechanism has been proposed in which an elastomer is disposed in contact with the space on the rotation direction side surrounded by the inner walls of both side plates (see Patent Document 1). According to such a rotation transmission mechanism of Patent Document 1, only the elastic deformation of the elastomer is used to buffer the impact caused by the speed change between the two rotating members, and the absorbed and accumulated energy is efficiently converted into the rotational kinetic energy. Can be converted.

  In addition, when the rotation transmission mechanism disclosed in Patent Document 1 is applied to a bicycle, the rotation transmission mechanism disposed on the rotation shaft of the bicycle that travels by rotating a wheel by human power is used during initial movement such as start, acceleration, and climbing or during traveling. It is possible to reliably absorb and store shock energy and excessive input energy generated by a large load received from the outside. As a result, the load on the human body can be significantly reduced, and the stored energy can be effectively used for the rotation of the rotating shaft when the input energy is reduced or interrupted. In addition, it has excellent reliability and efficiency of rotation transmission, can be reduced in weight with a simple configuration with few parts, is easy to disassemble and assemble, has excellent maintainability and productivity, and can be easily incorporated into an existing bicycle. Therefore, the bicycle can be excellent in mass productivity, assembly workability, space saving, and versatility. It is excellent in acceleration, uniformity of rotating torque, and stability during low-speed driving even when carrying heavy loads or carrying heavy people. Moreover, complicated operations are unnecessary, and even a woman, an elderly person, a housewife carrying heavy luggage or a child, etc. can easily drive. Not only is it easy to run on hills and roads with high resistance, but it is also excellent for acceleration, uniformity of rotational torque, and stability during low-speed driving, so it can be used for rehabilitation and competition. Bicycles with excellent operational stability, handling and versatility can be provided.

JP 2011-12688 A

  The bicycle of Patent Document 1 achieves the above-mentioned object. However, when a force more than the force that can be absorbed by elastic deformation is frequently applied to the elastically deforming member such as an elastomer, the elastically deforming member is damaged. The possibility increases and the durability may decrease.

  The present inventor has intensively studied to further improve the usability of the rotation transmission mechanism of Patent Document 1, and has completed the present invention.

  An object of this invention is to provide the rotation transmission mechanism which can implement | achieve the bicycle etc. which were excellent in the usability conventionally, and a bicycle provided with the same.

In order to achieve the above object, the first configuration of the rotation transmission mechanism according to the present invention is:
(1) An internal rotation member inserted through a rotation shaft, and an external rotation member disposed on the internal rotation member so as to be rotatable within a certain movable range,
The internal rotating member is
An internal rotating member body whose outer shape in front view is formed in a circular shape;
A proximal end connected to the inner rotating member main body, a distal end locked to the outer rotating member, and an elastically deformable long body,
The external rotating member is
An annular portion disposed on the outer peripheral side from the internal rotation member;
A protrusion projecting from the inner peripheral surface of the annular part toward the center of the annular part,
When the internal rotary member and the external rotary member rotate relative to each other, the elongated body rotates with the rotation of the internal rotary member so that a predetermined portion of the internal rotary member becomes the external part. It is characterized by elastic deformation until it comes into contact with the protrusion of the rotating member.

  According to the rotation transmission mechanism of (1), when the internal rotary member and the external rotary member rotate relative to each other, the elongated body rotates with the rotation of the internal rotary member, so that the internal rotary member Until the predetermined portion of the outer surface contacts the protrusion of the external rotating member. For example, by providing such a rotation transmission mechanism on, for example, the rotation shaft of a bicycle, impact energy or excessive input energy generated by a large load received from the outside during initial movement such as starting, acceleration, and climbing or during traveling is excessive. By elastically deforming the long body, the long body can be absorbed securely and the load on the human body can be greatly reduced, and the energy that the long body tries to return to its original shape is reduced or interrupted when the input energy decreases It can be used effectively without waste for rotation of the rotating shaft.

  Further, the long body is elastically deformed only until a predetermined portion of the internal rotation member comes into contact with the protrusion of the external rotation member. Accordingly, for example, the range in which the internal rotation member and the external rotation member can be relatively rotated can be determined in advance within a range that does not break even if the long body is elastically deformed frequently. Thus, it is possible to prevent the force more than the force that can be absorbed by elastic deformation from being frequently applied, to reduce the possibility that the long body is damaged, and to improve the durability of the rotation transmission mechanism.

  Furthermore, by configuring the member that stores energy as a long body, energy generated by an external force when the internal rotation member and the external rotation member rotate relatively can be absorbed by elastic deformation in the rotation direction. This makes it possible to reduce the thickness of the rotation transmission mechanism in the direction of the central axis of the rotation transmission mechanism, for example, compared to the case where the energy storage member is made of a material such as an elastomer. It becomes possible to make the mechanism compact.

  Therefore, it is possible to provide a rotation transmission mechanism capable of realizing a bicycle and the like that are more usable than conventional ones.

  In the configuration (1) of the rotation transmission mechanism of the present invention, the following configuration (2) is preferable.

(2) An external auxiliary rotating member disposed rotatably on the inner rotating member and the outer rotating member,
The external auxiliary rotating member is
An external auxiliary annular part rotatably arranged on the outer peripheral side of the annular part of the external rotating member;
An external auxiliary projection protruding from the inner peripheral surface of the external auxiliary ring portion toward the center of the external auxiliary ring portion, and
The external rotating member includes an annular projecting portion whose proximal end is connected to the outer peripheral surface of the annular portion, and whose distal end protrudes to the outer peripheral side of the annular portion,
An elastic member that is elastically deformable is disposed between the annular projecting portion of the external rotating member and the external auxiliary protruding portion of the external auxiliary rotating member,
The elastic member is elastically deformed by being sandwiched between the annular protrusion and the external auxiliary protrusion when the external rotating member and the external auxiliary rotating member rotate relatively. .

  According to the preferable configuration of (2) above, the long body absorbs the force when the internal rotation member and the external rotation member rotate relatively by elastic deformation, and the elastic member The force when the external auxiliary rotating member rotates relatively can be absorbed by elastic deformation, and two types of members can be installed as members that absorb the rotating force. Therefore, for example, the energy stored in the elastically deformed long body can be used as a propulsive force, and can be selectively used such as absorbing an impact when a rotating force is applied to the elastic member. Further, even when the members that are elastically deformed are multiplexed, it is possible to make the rotation transmission mechanism as a whole compact by using a long body partly as compared with the case where all elastic members are used. .

  In the configuration of (1) or (2) of the rotation transmission mechanism of the present invention, the following configuration (3) is preferable.

(3) An internal auxiliary rotation member is provided rotatably on the internal rotation member and the external rotation member,
The internal auxiliary rotating member is
An inner auxiliary rotating member main body disposed on the inner peripheral side of the inner rotating member main body of the inner rotating member, the outer shape of the front view formed in a circular shape;
A base end is connected to the outer peripheral surface of the internal auxiliary rotating member main body, and an inner auxiliary protruding portion protruding from the outer peripheral side of the internal auxiliary rotating member main body,
The internal rotating member is
The internal rotating member body is formed in an annular shape,
From the inner peripheral surface of the internal rotation member body, provided with an internal protrusion that protrudes in the center direction of the internal rotation member body,
An elastic member capable of elastic deformation is disposed between the internal auxiliary protrusion of the internal auxiliary rotation member and the internal protrusion of the internal rotation member,
The elastic member is elastically deformed by being sandwiched between the internal auxiliary protrusion and the internal protrusion when the internal auxiliary rotation member and the internal rotation member rotate relatively.

  According to the preferable configuration of (3) above, the long body absorbs the force when the internal rotation member and the external rotation member rotate relatively by elastic deformation, and the elastic member is the internal auxiliary rotation member. It is possible to absorb the force when the internal rotation member and the internal rotation member rotate relatively by elastic deformation, and two types of members can be installed as members that absorb the rotating force. Therefore, for example, the energy stored in the elastically deformed long body can be used as a propulsive force, and can be selectively used such as absorbing an impact when a rotating force is applied to the elastic member. Further, even when the members that are elastically deformed are multiplexed, it is possible to make the rotation transmission mechanism as a whole compact by using a long body partly as compared with the case where all elastic members are used. .

  In any of the above configurations (1) to (3) of the rotation transmission mechanism of the present invention, the following configuration (4) is preferable.

  (4) The elongate body is curved when the internal rotation member and the external rotation member are relatively rotated in an initial state where the internal rotation member and the external rotation member are not relatively rotated. It is characterized by being previously curved.

  According to the preferable configuration of (4) above, when the internal rotation member and the external rotation member rotate relatively, the long body can be bent in a direction that is preferable in design.

The configuration of the bicycle according to the present invention is as follows:
(5) The rotation transmission mechanism according to the present invention includes any one of the constitutions (1) to (4).

  According to the configuration (5) of the bicycle of the present invention, since the rotation transmission mechanism that exhibits the above-described effects is provided, it is possible to provide a bicycle that has better usability than the conventional one.

  ADVANTAGE OF THE INVENTION According to this invention, the rotation transmission mechanism and bicycle which can implement | achieve the bicycle etc. which were excellent in the usability than before can be provided.

FIG. 1 is a surface view showing a rotation transmission mechanism in an embodiment of the present invention. FIG. 2 is a back view showing the rotation transmission mechanism in the embodiment of the present invention. 3 is a cross-sectional view taken along line III-III in FIG. FIG. 4 is an exploded surface view showing a state in which the cover portion of the external rotation member constituting the rotation transmission mechanism is removed. 4A shows an initial state of the rotation transmission mechanism (a state in which the internal rotation member and the external rotation member are not relatively rotated), and FIG. 4B shows an energy storage state of the rotation transmission mechanism (an internal rotation member). And a state where the relative rotation angle of the external rotation member is maximum). FIG. 5 is an exploded surface view illustrating a state in which a cover portion of an external rotation member constituting the rotation transmission mechanism according to the first modification is removed. FIG. 5A shows an initial state of the rotation transmission mechanism (a state where the internal rotation member and the external rotation member are not relatively rotated), and FIG. 5B shows an energy storage state of the rotation transmission mechanism (an internal rotation member). And a state where the relative rotation angle of the external rotation member is maximum). FIG. 6 is an exploded surface view showing a state in which the cover portion of the external rotation member constituting the rotation transmission mechanism according to Modification 2 is removed. FIG. 6A shows an initial state of the rotation transmission mechanism (a state where the internal rotation member and the external rotation member are not relatively rotated), and FIG. 6B shows an energy storage state of the rotation transmission mechanism (an internal rotation member). And a state where the relative rotation angle of the external rotation member is maximum). FIG. 7 is an exploded surface view illustrating a state in which the cover portion of the external rotation member constituting the rotation transmission mechanism according to Modification 3 is removed. FIG. 7A shows an initial state of the rotation transmission mechanism (a state where the internal rotation member and the external rotation member are not relatively rotated), and FIG. 7B shows an energy storage state of the rotation transmission mechanism (an internal rotation member). And a state where the relative rotation angle of the external rotation member is maximum). FIG. 8 is an exploded surface view illustrating a state in which the cover portion of the external rotation member constituting the rotation transmission mechanism according to the modification 4 is removed. 8A shows an initial state of the rotation transmission mechanism (a state where the internal rotation member and the external rotation member are not relatively rotated), and FIG. 8B shows an energy storage state of the rotation transmission mechanism (an internal rotation member). And a state where the relative rotation angle of the external rotation member is maximum). FIG. 9 is a diagram for explaining a rotation transmission mechanism according to the fifth modification. FIG. 9A is a rear view showing the rotation transmission mechanism. FIG. 9B is a cross-sectional view taken along line VV in FIG. FIG. 10 is a cross-sectional view of the main part showing an example in which the rotation transmission mechanism in the embodiment of the present invention is used in a bicycle.

  Hereinafter, the present invention will be described more specifically with reference to preferred embodiments. However, the following embodiments are merely examples embodying the present invention, and the present invention is not limited thereto.

(Configuration of rotation transmission mechanism)
First, the configuration of the rotation transmission mechanism in the embodiment of the present invention will be described with reference to the drawings.

  1 is a front view showing a rotation transmission mechanism in an embodiment of the present invention, FIG. 2 is a back view showing the rotation transmission mechanism, FIG. 3 is a cross-sectional view taken along line III-III in FIG. These are the exploded surface views which show the state which removed the cover part of the external rotation member which comprises the said rotation transmission mechanism. 4A shows an initial state of the rotation transmission mechanism (a state in which the internal rotation member and the external rotation member are not relatively rotated), and FIG. 4B shows an energy storage state of the rotation transmission mechanism (an internal rotation member). And a state where the relative rotation angle of the external rotation member is maximum).

  As shown in FIGS. 1 to 4, the rotation transmission mechanism 1 according to the present embodiment includes an internal rotation member 3 inserted through a rotation shaft such as a bicycle crankshaft and the internal rotation member 3. And an external rotating member 4 disposed in a certain movable range.

  The internal rotary member 3 has an internal rotary member main body 3a whose outer shape in front view is formed in a circular shape (for example, a disk shape), and a low-profile columnar shape integrally formed on the front and back surfaces of the internal rotary member main body 3a. Convex portions 3b, 3c, a press-fitting concave portion 3d having a substantially oval cross section formed in the convex portion 3b, and a rectangular cylindrical shape penetrating the convex portion 3c and the internal rotation member main body 3a to reach the press-fitting concave portion 3d. Crankshaft insertion hole 3e.

  As shown in FIG. 3, the external rotation member 4 includes a side plate portion 4 a that is rotatably inserted into the convex portion 3 c of the internal rotation member 3 at the side position of the internal rotation member 3, and an outer side of the internal rotation member 3. And an annular portion 4b screwed and fixed to the outer periphery of the side plate portion 4a, and a convex portion 3b that is rotatably disposed in a state of being opposed to the side plate portion 4a and screwed to the annular portion 4b. Cover portion 4d. A chain ring 5 is fixed to the outer peripheral portion on the back surface side of the annular portion 4 b of the external rotating member 4.

Further, as shown in FIG. 4, the internal rotary member main body 3a may include a protruding portion 3f having a proximal end connected to the outer peripheral surface of the internal rotary member main body 3a and a tip protruding to the outer peripheral side of the internal rotary member main body 3a. Good.
The internal rotation member 3 further includes a long body 3g whose base end is connected to the projecting portion 3f (internal rotation member main body 3a), the distal end is locked to the external rotation member 4, and is elastically deformable. The elongated body 3g may be locked to the surface of the external rotating member 4 with a fixing member such as a screw, or a hole is formed on the side surface of the external rotating member 4 so that the long body 3g is fitted into the hole. , You may attach. Further, as in a two-step convex portion 42c of FIG. 8 to be described later, a mode in which the distal end of the elongated body 3g is locked by coming into contact with a convex portion located inside the external rotating member 4 may be employed. This makes it possible to replace the long body 3g when it deteriorates.

A plurality (two in the example shown in FIG. 4) of protrusions 3f are provided at a predetermined interval (180 ° in the example shown in FIG. 4) on the outer peripheral surface of the internal rotating member main body 3a. The number of protrusions 3f can be any number.
As shown in FIG. 4, the protruding portion 3 f may be formed in a shape in which the tip side bulges in the direction opposite to the rotation direction, or may be formed in a rectangular shape or a trapezoidal shape when viewed from the front.
Further, the proximal end of the elongated body 3g is connected to the vicinity of the distal end side of the protruding portion 3f.

The long body 3g is made of, for example, a metal leaf spring, and is provided with a plurality (two in the example shown in FIG. 4) at predetermined intervals (180 ° in the example shown in FIG. 4). The long body 3g can be an arbitrary number.
In addition, the elongated body 3g is curved in a direction in which the internal rotation member 3 and the external rotation member 4 are relatively rotated in an initial state where the internal rotation member 3 and the external rotation member 4 are not relatively rotated. It may be slightly curved in advance. Thereby, when the internal rotation member 3 and the external rotation member 4 rotate relatively, the elongate body 3g can be curved in a preferable direction in terms of design.

As shown in FIG. 4, the annular portion 4 b is rotatably disposed on the internal rotation member 3 on the outer peripheral side from the internal rotation member 3.
The external rotating member 4 further includes a protrusion 4c that protrudes from the inner peripheral surface of the annular portion 4b toward the center of the annular portion 4b.

  The protrusions 4c extend along the inner peripheral surface of the annular part 4b, and are provided in a plurality (two in the example shown in FIG. 4) at predetermined intervals (180 ° in the example shown in FIG. 4). .

When the internal rotation member 3 and the external rotation member 4 rotate relative to each other, the protrusion 4c is long in the vicinity of the tip, which is the end of the rotation direction of the internal rotation member 3 (the direction indicated by the arrow in FIG. 4). The tip of the body 3g is locked.
In addition, the protrusion 4c has, in an initial state, the tip of the protrusion 3f of the internal rotation member 3 adjacent to the tip that is the end of the rotation direction of the internal rotation member 3 (the direction indicated by the arrow in FIG. 4) on the rotation direction side. It is in contact. The protrusion 4c is an end portion on the opposite side to the rotation direction of the internal rotation member 3 (the direction indicated by the arrow in FIG. 4) when the internal rotation member 3 and the external rotation member 4 are relatively rotated. The end of the protruding portion 3f of the internal rotation member 3 adjacent to the end on the opposite side to the rotation direction comes into contact. The position of the end portion of the protrusion 4c is determined so as to be within a range in which the elongated body 3g can be elastically deformed without difficulty.

With the configuration as described above, the rotation transmission mechanism 1 operates as follows.
When the internal rotation member 3 is rotated in one direction (for example, in the direction of the arrow shown in FIG. 4A) from the initial state shown in FIG. It moves in the direction approaching the rear end of the protrusion 4 c of the rotating member 4, and the base end of the elongated body 3 g rotates with the internal rotating member 3. Thereby, the elongated body 3g is elastically deformed until the tip of the protruding portion 3f of the internal rotating member 3 comes into contact with the rear end of the protruding portion 4c of the external rotating member 4, and the energy storage state shown in FIG. It becomes. Thereby, a part of force which rotated the internal rotation member 3 is accumulate | stored as elastic energy in the elongate body 3g. Thereafter, the internal rotation member 3 and the external rotation member 4 rotate integrally, and when the force of the foot is lost at the top dead center and the bottom dead center, the elastic energy is released and transmitted to the chain to become a propulsive force. And the internal rotation member 3 and the external rotation member 4 return to the state shown to Fig.4 (a).

(Modification 1)
Next, a rotation transmission mechanism 1A according to Modification 1 of the present embodiment will be described. In addition, although the modifications 1-3 are demonstrated below, description is abbreviate | omitted or simplified about the structure similar to the rotation transmission mechanism 1 which concerns on this embodiment.
FIG. 5 is an exploded surface view illustrating a state in which a cover portion of an external rotation member constituting the rotation transmission mechanism according to the first modification is removed. FIG. 5A shows an initial state of the rotation transmission mechanism (a state where the internal rotation member and the external rotation member are not relatively rotated), and FIG. 5B shows an energy storage state of the rotation transmission mechanism (an internal rotation member). And a state where the relative rotation angle of the external rotation member is maximum).

  A rotation transmission mechanism 1A according to Modification 1 includes an internal rotation member 30 inserted through a rotation shaft such as a crankshaft of a bicycle, and an external rotation member 40 rotatably disposed in the internal rotation member 30. I have.

The internal rotation member 30 in Modification 1 is different from the internal rotation member 3 (see FIG. 4) of the present embodiment in the shape and number of protrusions.
Four protrusions 30f of the internal rotating member 30 are provided at 90 ° intervals on the outer peripheral surface of the internal rotating member main body 3a. Further, the protrusion 30f is formed in a trapezoidal shape in front view so that the width becomes narrower from the proximal end side toward the distal end side.

  The long body 30g according to the first modification is provided with four proximal ends near the proximal end of the projecting portion 30f, with the distal end engaged with the external rotating member 40, and at 90 ° intervals.

The external rotation member 40 is different from the external rotation member 4 of this embodiment (see FIG. 4) in the number of protrusions.
Two protrusions 4c are provided at intervals of 90 °.

With the above configuration, the rotation transmission mechanism 1A operates as follows.
When the internal rotation member 30 is rotated in one direction (for example, in the direction of the arrow shown in FIG. 5A) from the initial state shown in FIG. The rotating member 40 moves in the direction approaching the rear end of the protrusion 4 c, and the base end of the long body 30 g rotates with the internal rotating member 30. As a result, the elongated body 30g is elastically deformed until the tip of the protruding portion 30f of the internal rotating member 30 contacts the rear end of the protruding portion 4c of the external rotating member 40, and the energy storage state shown in FIG. It becomes. Thereby, a part of force which rotated the internal rotation member 30 is accumulate | stored as elastic energy in the elongate body 30g. Subsequent operations are the same as in this embodiment.

(Modification 2)
Next, a rotation transmission mechanism 1B according to Modification 2 of the present embodiment will be described.
FIG. 6 is an exploded surface view showing a state in which the cover portion of the external rotation member constituting the rotation transmission mechanism according to Modification 2 is removed. FIG. 6A shows an initial state of the rotation transmission mechanism (a state where the internal rotation member and the external rotation member are not relatively rotated), and FIG. 6B shows an energy storage state of the rotation transmission mechanism (an internal rotation member). And a state where the relative rotation angle of the external rotation member is maximum).

  A rotation transmission mechanism 1B according to Modification 2 is inserted through a rotation shaft such as a crankshaft of a bicycle, for example, and is disposed rotatably on the internal rotation member 3 having the same configuration as that of the present embodiment and the internal rotation member 3. And an external auxiliary rotation member 51 rotatably disposed on the internal rotation member 3 and the external rotation member 41.

  The external rotation member 41 in Modification 2 is different from the external rotation member 4 (see FIG. 4) of the present embodiment in the shape of the protrusion 41c. Further, the external rotating member 41 further includes a stopper 41d and an annular protrusion 41e.

  The external rotation member 41 has a shorter length along the inner peripheral surface of the annular portion 4b of the protrusion 41c than the protrusion 4c (see FIG. 4) of the present embodiment, and the rear end of the protrusion 4c is disposed. A stopper 41d is arranged at a position corresponding to the position. For this reason, in the rotation transmission mechanism 1B, when the internal rotation member 3 and the external rotation member 41 rotate relatively, the tip of the protruding portion 3f of the internal rotation member 3 comes into contact with the stopper 41d. The position of the stopper 41d is determined so as to be within a range where the elongated body 3g can be elastically deformed without difficulty.

  The annular projecting portion 41e has a proximal end connected to the outer peripheral surface of the annular portion 4b, and a distal end that protrudes to the outer peripheral side of the annular portion 4b, and is provided at a predetermined interval (90 ° interval in the example shown in FIG. 6). (4 in the example shown in FIG. 6). The number of annular protrusions 41e can be any number.

  The external auxiliary rotating member 51 is screwed and fixed to the outer side of the side plate portion 51a and the side plate portion 51a rotatably inserted into the inner rotating member main body 3a of the inner rotating member 3 at the side position of the inner rotating member 3. The external auxiliary annular portion 51b rotatably disposed on the internal rotational member on the outer peripheral side of the annular portion 4b of the external rotating member 41, and the external auxiliary annular ring from the inner peripheral surface of the external auxiliary annular portion 51b. And an external auxiliary protrusion 51c protruding in the center direction of the portion 51b.

  A plurality (four in the example shown in FIG. 6) of external auxiliary projections 51c are provided at a predetermined interval (90 ° in the example shown in FIG. 6). The number of external auxiliary projections 51c can be any number.

  In the rotation transmission mechanism 1 </ b> B, an elastic member 61 that is elastically deformable is disposed between the annular protrusion 41 e of the external rotation member 41 and the external auxiliary projection 51 c of the external auxiliary rotation member 51.

The elastic member 61 is disposed between the annular protrusion 41e and the external auxiliary protrusion 51c along the rotation direction of the external rotation member 41 (for example, the arrow direction shown in FIG. 6A). That is, although the four elastic members 61 are provided, it can be made into arbitrary numbers according to the number of the annular protrusion parts 41e and the external auxiliary projection parts 51c.
The elastic member 61 is elastically deformed by being sandwiched between the annular protrusion 41e and the external auxiliary protrusion 51c when the external rotation member 41 and the external auxiliary rotation member 51 are relatively rotated.

With the configuration described above, the rotation transmission mechanism 1B operates as follows.
When the internal rotation member 3 is rotated in one direction (for example, in the direction of the arrow shown in FIG. 6A) from the initial state shown in FIG. The rotating member 41 moves in a direction close to the stopper 41 d, and the base end of the long body 3 g rotates with the internal rotating member 3. Thereby, the elongated body 3g is elastically deformed and enters an energy storage state until the tip of the protruding portion 3f of the internal rotation member 3 contacts the stopper 41d of the external rotation member 41.
Thereafter, the external rotation member 41 also rotates in one direction (for example, the arrow direction shown in FIG. 6A), and the annular protrusion 41e of the external rotation member 41 approaches the external auxiliary projection 51c of the external auxiliary rotation member 51. Move in the direction you want. As a result, the elastic member 61 is sandwiched between the annular protrusion 41e and the external auxiliary protrusion 51c, elastically deforms, and enters the energy storage state shown in FIG. 6B. Thereby, a part of force which rotated the internal rotation member 3 is accumulate | stored in the elongate body 3g and the elastic member 61 as elastic energy. Subsequent operations are the same as in this embodiment. Thus, in this example, the elongated body 3g is first deformed, and the elastic member 61 starts to shrink in the middle. That is, the elongate body 3g and the elastic member 61 have different timings at which deformation starts. Thereby, for example, when the rotation transmission mechanism 1B is applied to a bicycle, it can be squeezed out with a relatively weak force, and more elastic energy can be stored. We can provide the best bicycle.

(Modification 3)
Next, a rotation transmission mechanism 1C according to Modification 3 of the present embodiment will be described.
FIG. 7 is an exploded surface view illustrating a state in which the cover portion of the external rotation member constituting the rotation transmission mechanism according to Modification 3 is removed. FIG. 7A shows an initial state of the rotation transmission mechanism (a state where the internal rotation member and the external rotation member are not relatively rotated), and FIG. 7B shows an energy storage state of the rotation transmission mechanism (an internal rotation member). And a state where the relative rotation angle of the external rotation member is maximum).

  A rotation transmission mechanism 1C according to Modification 3 is inserted into a rotation shaft such as a crankshaft of a bicycle, for example, and an internal rotation obtained by deforming a part of the internal rotation member 30 (see FIG. 5) of Modification 1 of the present embodiment. The member 32 has the same configuration as that of the first modification of the present embodiment, and the outer rotating member 40 rotatably disposed on the inner rotating member 32, and the inner rotating member 32 and the outer rotating member 40 are rotatable. And an internal auxiliary rotating member 62 disposed on the inside.

  The internal rotation member 32 in Modification 3 is different from the internal rotation member 30 in Modification 1 in the internal rotation member main body 32a. The internal rotation member 32 further includes an internal protrusion 32h.

  The internal rotation member main body 32a is formed in an annular shape, and an internal auxiliary rotation member 62 is rotatably disposed therein.

  The internal protrusions 32h protrude from the inner peripheral surface of the internal rotation member main body 32a toward the center of the internal rotation member main body 32a, and are provided at four intervals of 90 °.

  The internal auxiliary rotating member 62 is disposed on the inner peripheral side of the internal rotating member main body 32a of the internal rotating member 32, and has an internal auxiliary rotating member main body 62a having a circular outer shape in front view, and an internal auxiliary rotating member main body. The base end is connected to the outer peripheral surface of 62a, The internal auxiliary | assistant protrusion part 62b which protrudes to the outer peripheral side of the internal auxiliary | assistant rotation member main body 62a is provided.

  The internal auxiliary rotation member main body 62a has a crankshaft insertion hole instead of the internal rotation member 3 of the present embodiment, and receives a force for rotating the rotation transmission mechanism 1C from the crankshaft inserted through the crankshaft insertion hole. .

  A plurality (four in the example shown in FIG. 7) of the internal auxiliary protrusions 62b are provided at a predetermined interval (90 ° in the example shown in FIG. 7). The number of internal auxiliary protrusions 62b can be any number.

  In the rotation transmission mechanism 1 </ b> C, an elastic member 72 that can be elastically deformed is disposed between the internal auxiliary protrusion 62 b of the internal auxiliary rotation member 62 and the internal protrusion 32 h of the internal rotation member 32.

The elastic member 72 is disposed between the internal auxiliary protrusion 62b and the internal protrusion 32h along the rotation direction of the internal auxiliary rotation member 62 (for example, the arrow direction shown in FIG. 7A). That is, although the four elastic members 72 are provided, it can be set to any number according to the number of the internal auxiliary protrusions 62b and the internal protrusions 32h.
The elastic member 72 is elastically deformed by being sandwiched between the internal auxiliary protrusion 62b and the internal protrusion 32h when the internal auxiliary rotation member 62 and the internal rotation member 32 rotate relatively.

  The elastic member 72 and the elastic member 61 of Modification 2 are made of synthetic rubber, but are not limited thereto, and may be any member that can be elastically deformed (compressed and deformed) and can transmit rotation after the deformation. The amount, elastic modulus and the like can be appropriately selected according to the user's preference.

With the configuration as described above, the rotation transmission mechanism 1C operates as follows.
When the rotation transmission mechanism 1C rotates the internal auxiliary rotation member 62 in one direction (for example, the arrow direction shown in FIG. 7A) from the initial state shown in FIG.
The internal auxiliary protrusion 62b of the internal auxiliary rotation member 62 moves in the direction approaching the internal protrusion 32h of the internal rotation member 32. As a result, the elastic member 72 is sandwiched between the internal auxiliary protrusion 62b and the internal protrusion 32h, is elastically deformed, and enters an energy storage state.
Thereafter, the internal rotation member 32 also rotates in one direction (for example, in the direction of the arrow shown in FIG. 7A), and the tip of the protrusion 30f moves in a direction close to the rear end of the protrusion 4c of the external rotation member 40. The base end of the long body 30 g rotates with the internal rotation member 32. As a result, the elongated body 30g is elastically deformed until the tip of the protrusion 30f of the internal rotation member 32 comes into contact with the rear end of the protrusion 4c of the external rotation member 40, and the energy storage state shown in FIG. It becomes. Accordingly, a part of the force that rotates the internal auxiliary rotating member 62 is accumulated as elastic energy in the long body 30g and the elastic member 72. Subsequent operations are the same as in this embodiment. Further, the same operational effects as those of the third modification are obtained.

(Modification 4)
Next, a rotation transmission mechanism 1D according to Modification 4 of the present embodiment will be described.
FIG. 8 is an exploded surface view illustrating a state in which the cover portion of the external rotation member constituting the rotation transmission mechanism according to the modification 4 is removed. 8A shows an initial state of the rotation transmission mechanism (a state where the internal rotation member and the external rotation member are not relatively rotated), and FIG. 8B shows an energy storage state of the rotation transmission mechanism (an internal rotation member). And a state where the relative rotation angle of the external rotation member is maximum).

  A rotation transmission mechanism 1D according to Modification 4 includes an internal rotation member 33 inserted through a rotation shaft such as a bicycle crankshaft, and an external rotation member 42 rotatably disposed in the internal rotation member 33. I have.

  The internal rotation member 33 in the modified example 4 is not provided with a protrusion on the internal rotation member main body 3a, and the base end of the elongated body 3g is attached to the outer periphery of the internal rotation member main body 3a. It differs from the internal rotation member 3 (refer FIG. 4) of embodiment.

  In the external rotating member 42, instead of the protrusion 4c, the two-step convex portion 42c protrudes from the inner peripheral surface of the annular portion 4b toward the center of the annular portion 4b, and a predetermined interval (in the example shown in FIG. A plurality (two in the example shown in FIG. 4) are provided at intervals of 180 °.

  The second-stage convex part 42c includes a first-stage convex part and a second-stage convex part that protrudes from the first-stage convex part in the center direction of the annular part 4b. The leading end side of the elongated body 3g is locked to the first-stage convex portion. When the internal rotation member 33 is rotated in one direction (for example, in the direction of the arrow shown in FIG. 8A) from the initial state shown in FIG. The 3g middle part contacts. Thus, the 2nd step convex part of the 2 step | paragraph convex part 42c functions as a stopper which suppresses that the elongate body 3g elastically deforms more than a setting value.

With the above configuration, the rotation transmission mechanism 1D operates as follows.
When the internal rotation member 33 is rotated in one direction (for example, in the direction of the arrow shown in FIG. 8A) from the initial state shown in FIG. 8A, the rotation transmission mechanism 1D has a base end of the elongated body 3g. It rotates with the internal rotating member main body 3a. Thereby, the long body 3g is elastically deformed until the intermediate portion comes into contact with the second-stage convex portion of the second-stage convex portion 42c of the external rotating member 42, and the energy storage state shown in FIG. Thereby, a part of force which rotated the internal rotation member 33 is accumulate | stored as elastic energy in the elongate body 3g. Subsequent operations are the same as in this embodiment.

(Modification 5)
Next, a rotation transmission mechanism 1E according to Modification 5 of the present embodiment will be described.
FIG. 9 is a diagram for explaining a rotation transmission mechanism according to the fifth modification. FIG. 9A is a rear view showing the rotation transmission mechanism. FIG. 9B is a cross-sectional view taken along line VV in FIG. In FIG. 9A, in order to supplement the understanding, a member that is disposed on the front surface side of the side plate portion 4a and cannot be seen from the back surface side is indicated by a dotted line.

  A rotation transmission mechanism 1E according to Modification 5 includes an internal rotation member 34 inserted through a rotation shaft such as a crankshaft of a bicycle, and an external rotation member 43 rotatably disposed on the internal rotation member 34. I have.

  The internal rotation member 34 in Modification 5 is different from the internal rotation member 3 of this embodiment (see FIG. 4) in that a back surface side protruding portion 3h is formed on the back surface side of the internal rotation member main body 3a.

The rear surface side protruding portion 3h is disposed on the central portion 3ha having a circular outer shape in front view (for example, a disc shape) and the outer peripheral surface of the central portion 3ha, and the proximal end is formed in the central portion. And a fan-shaped outer peripheral portion 3hb having a circular arc shape on the side.
A plurality (two in the example shown in FIG. 9) of back surface side protruding portions 3h are provided at a predetermined interval (180 ° in the example shown in FIG. 9). In addition, the back surface side protrusion part 3h may be one, and three or more may be provided.

  The external rotating member 43 in the modified example 5 is that the central hole 4e is formed in the central part of the side plate part 4a, and the fixing part 43c is provided instead of the protruding part. 2).

The central hole 4e includes a central edge 4ea formed along the outer peripheral surface of the central portion 3ha of the rear surface side protruding portion 3h, and an outer peripheral surface of the outer peripheral portion 3hb of the rear surface side protruding portion 3h on the outer peripheral side of the central edge portion 4ea. And a pair of stop edge portions 4ec that connect both ends of the central edge portion 4ea and the outer periphery portion 4eb, respectively.
A plurality (two in the example shown in FIG. 9) of the central holes 4e are provided at a predetermined interval (180 ° in the example shown in FIG. 9). In addition, the back surface side protrusion part 3h may be one, and three or more may be provided.

  The length of the outer peripheral edge portion 4eb (the interval between the pair of retaining edge portions 4ec) is formed with a length corresponding to the movable range in which the internal rotation member 34 can rotate relative to the external rotation member 43. .

  The fixing portion 43c is provided on the inner peripheral surface of the annular portion 4b, and the distal end of the long body 3g is locked. Note that the fixing portion 43c may be omitted if the end of the long body 3g is engaged with the annular portion 4b.

According to the rotation transmission mechanism 1E according to the fifth modification example, in the initial state, one side surface (the left side surface in the example shown in FIG. 9A) of the outer peripheral portion 3hb of the internal rotation member 34 is the external rotation member. 43 is in contact with or close to one stop edge 4ec (left stop edge 4ec in the example shown in FIG. 9A).
When the internal rotation member 34 is rotated from the initial state to the other side (for example, the arrow direction shown in FIG. 9A), the tip of the protruding portion 3f moves to the other side, and the base of the long body 3g. The end rotates with the internal rotation member 3. Accordingly, the long body 3g is elastically deformed and enters an energy storage state until the intermediate portion comes into contact with the second-stage convex portion of the second-stage convex portion 42c of the external rotating member 42. Thereby, a part of force which rotated the internal rotation member 3 is accumulate | stored as elastic energy in the elongate body 3g. Subsequent operations are the same as in this embodiment.

(Example of use of rotation transmission mechanism)
Next, a usage example of the rotation transmission mechanism 1 in the present embodiment will be described with reference to FIG.

  FIG. 10 is a cross-sectional plan view of an essential part showing an example in which the rotation transmission mechanism in the embodiment of the present invention is used in a bicycle.

As shown in FIG. 10, a crankshaft 2 of a bicycle as a rotating shaft is rotatably held by a crankshaft holding portion 7 integrated with a bicycle frame via left and right ball bearings 8a and 8b. The rotation transmission mechanism 1 is mounted on the right end portion of the crankshaft 2 by inserting and fixing the crankshaft insertion hole 3e (see FIG. 3) of the internal rotation member 3. Crank arms 9a and 9b are fixed to the left and right ends of the crankshaft 2 with a phase difference of 180 degrees. In FIG. 10, reference numeral 10 is a crank arm fixing member for fixing the crank arms 9 a and 9 b to the crankshaft 2. The crankshaft 2 is fitted with a square tube of the crankshaft insertion hole 3e of the internal rotation member 3, and both rotate integrally.
A rotatable pedal (not shown) is disposed at the end of the crank arms 9a and 9b.

With such a configuration, when the driver steps on a pedal (not shown) disposed at the end of the crank arms 9 a and 9 b, the internal rotary member 3 together with the crankshaft 2 is relative to the external rotary member 4. The elongated body 3g (see FIG. 4) is elastically deformed, and a part of the force that rotates the crankshaft 2 is accumulated as elastic energy.
At the initial stage of rotation of the crankshaft 2, the elongated body 3 g is elastically deformed, but after the deformation, the rotational force of the crankshaft 2 is transmitted from the internal rotation member 3 to the external rotation member 4, and from the crankshaft 2 to the chain ring 5. Rotate substantially integrally, and the rotation is reliably transmitted to the sprocket on the rear wheel side by a chain (not shown) stretched around the chain ring 5.
The elastically deformed (compressed) elongate body 3g is restored when the input from the pedal is interrupted or weakened, and presses the annular portion 4b as the restoring energy to advance the external rotating member 4 and the chain ring 5. Rotate in the direction. That is, the compression (elastic) energy of the long body 3g is converted into rotational energy and used as a driving force for the bicycle.

  In the present embodiment, the rotation transmission mechanism 1, 1A, 1B, 1C used for a bicycle has been described as an example. However, the rotation transmission mechanism of the present invention is not necessarily limited to such an application. . The rotation transmission mechanism of the present invention can also be used in a mechanism having wheels, for example, a normal bicycle, a power-assisted bicycle, a civil engineering unicycle, a wheelchair, a rickshaw, a rear car, and the like, and a similar effect can be obtained. Moreover, it can be used not only for moving means but also for general mechanisms involving rotation, for example, home appliances, rotating brushes, mowers, generators with rotating mechanisms such as wind power generation.

1, 1A, 1B, 1C, 1D, 1E Rotation transmission mechanism 2 Crankshaft 3, 30, 32, 33, 34 Internal rotation member 3a, 32a Internal rotation member main body 3b Protrusion 3c Protrusion 3d Press-fit recess 3e Crankshaft insertion Hole 3f, 30f Protruding part 3g, 30g Long body 3h Back side protruding part 3ha Center part 3hb Outer peripheral part 4, 40, 41, 42, 43 External rotating member 4a Side plate part 4b Ring part 4c, 41c Projection part 4d Cover part 4e Central hole 4ea Central edge portion 4eb Outer peripheral edge portion 4ec Edge portion 5 Chain ring 7 Crankshaft holding portion 8a Ball bearing 8b Ball bearing 9a Crank arm 9b Crank arm 32h Inner protrusion 41d Stopper 41e Ring protrusion 42c Two-step protrusion 43c Fixed portion 51 External auxiliary rotating member 51a Side plate portion 51b External auxiliary annular portion 51c External auxiliary protrusion 61 , 72 Elastic member 62 Internal auxiliary rotating member 62a Internal auxiliary rotating member main body 62b Internal auxiliary protruding portion

Claims (5)

An internal rotation member inserted through the rotation shaft; and an external rotation member disposed on the internal rotation member so as to be rotatable within a certain range of motion.
The internal rotating member is
An internal rotating member body;
A proximal end attached to the inner rotating member main body, a distal end locked to the outer rotating member, and an elastically deformable long body,
The external rotating member is
An annular portion disposed on the outer peripheral side from the internal rotation member;
A protrusion projecting from the inner peripheral surface of the annular part toward the center of the annular part,
When the internal rotary member and the external rotary member rotate relative to each other, the elongated body rotates with the rotation of the internal rotary member so that a predetermined portion of the internal rotary member becomes the external part. A rotation transmission mechanism that is elastically deformed until it abuts against a protrusion of the rotation member. An external auxiliary rotating member rotatably disposed on the inner rotating member and the outer rotating member;
The external auxiliary rotating member is
An external auxiliary annular part rotatably arranged on the outer peripheral side of the annular part of the external rotating member;
An external auxiliary projection protruding from the inner peripheral surface of the external auxiliary ring portion toward the center of the external auxiliary ring portion, and
The external rotating member includes an annular projecting portion whose proximal end is connected to the outer peripheral surface of the annular portion, and whose distal end protrudes to the outer peripheral side of the annular portion,
An elastic member that is elastically deformable is disposed between the annular projecting portion of the external rotating member and the external auxiliary protruding portion of the external auxiliary rotating member,
The elastic member is elastically deformed by being sandwiched between the annular protrusion and the external auxiliary protrusion when the external rotating member and the external auxiliary rotating member rotate relatively. The rotation transmission mechanism according to claim 1. An internal auxiliary rotation member rotatably disposed on the internal rotation member and the external rotation member;
The internal auxiliary rotating member is
An inner auxiliary rotating member main body disposed on the inner peripheral side of the inner rotating member main body of the inner rotating member, the outer shape of the front view formed in a circular shape;
A base end is connected to the outer peripheral surface of the internal auxiliary rotating member main body, and an inner auxiliary protruding portion protruding from the outer peripheral side of the internal auxiliary rotating member main body,
The internal rotating member is
The internal rotating member body is formed in an annular shape,
From the inner peripheral surface of the internal rotation member body, provided with an internal protrusion that protrudes in the center direction of the internal rotation member body,
An elastic member capable of elastic deformation is disposed between the internal auxiliary protrusion of the internal auxiliary rotation member and the internal protrusion of the internal rotation member,
The elastic member is elastically deformed by being sandwiched between the internal auxiliary protrusion and the internal protrusion when the internal auxiliary rotation member and the internal rotation member rotate relatively. Item 3. A rotation transmission mechanism according to Item 1 or 2.   The elongated body is previously curved in a direction to be bent when the internal rotation member and the external rotation member are relatively rotated in an initial state where the internal rotation member and the external rotation member are not relatively rotated. The rotation transmission mechanism according to any one of claims 1 to 3, wherein the rotation transmission mechanism is provided. A bicycle comprising the rotation transmission mechanism according to any one of claims 1 to 4.