JPH08135680A - Clutch mechanism by gear - Google Patents

Abstract

PURPOSE: To provide strong movable gear promoting force independent of an installation direction, prevent abrasion loss of teeth surfaces, reduce noises and the number of part items in a clutch mechanism having gears in which power transmission and non-power transmission are switched through shifting a position of a movable gear on an intermediate position of transmission, by applying pressure to the side surface of the movable gear by means of a movable gear guide, and providing friction on the side surface of the gear as movable gear promoting force. CONSTITUTION: In a clutch mechanism, power transmission and non-power transmission are switched by shifting a position of a movable gear at an intermediate position of transmission. In such a clutch mechanism is arranged a driving gear 1 and a movable gear 2 which can be moved on an optional arcuate orbit formed concentrically to a driving gear pitch circle. Friction on the side of the gear serves as promoting force of the movable gear by a movable support 6 which applied pressure to the side surface of the movable gear.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clutch mechanism using gears that moves a movable gear position in the middle of transmission in a gear train that transmits power to switch between power transmission and non-power transmission.

[0002]

2. Description of the Related Art In order to move a movable gear position in the middle of transmission to form a clutch mechanism by a gear that switches between power transmission and non-power transmission, first, a rail portion on which the movable gear can move is provided on the mechanism, , In order to generate the moving force of the movable gear, the force balance relationship is small, the frictional force that keeps the movable gear in the field and the force that acts in the direction of blocking the propulsive force due to the weight of the movable gear are small, to the It is necessary to increase the propulsive force to move it.

In the conventional method, two methods have been adopted in order to generate a force for moving the movable gear.

One is to support the weight of the movable gear with a bearing by making the tooth flank of the gear train perpendicular to the ground against a large propulsive force acting in the longitudinal direction of the shaft hole generated by the rotation of the movable gear. Reduces the force acting in the direction of blocking the propulsion force,
This is a method to generate the moving force of the movable gear.One is the force acting in the longitudinal direction of the shaft hole generated by the rotation of the movable gear and the increased contact by connecting the drive gear and the movable gear with a spring. Using the friction of the tooth surface as a great driving force,
This is a method of generating a moving force of the movable gear by reducing the force acting in the direction that blocks the friction that keeps the movable gear in the field and the propulsive force due to the weight of the movable gear.

Representative examples of the above two methods will be described below.

One is a method in which the tooth flanks of the gear train are perpendicular to the ground and the weight of the movable gear is supported by bearings to reduce the force acting in the direction of blocking the propulsion force. As shown, a driving gear having tooth flanks perpendicular to the ground surface: 1, a movable gear: 2, and a driven gear: 3
And the movable gear: 2 is composed of a movement support part: 4 which is made so as to be able to move on an arbitrary arc locus on the power generation side gear pitch circle and a concentric circle.

When the gear train is viewed from above, the rotating force acts as shown in FIG. 2 at a right angle to the tooth surface contact point, and the force F _{1 in the} direction of rotation and the drive gear: 1 center And movable gear: It works in parallel with the line connecting the two centers, and the movable gear:
A force F ₂ that points to the center of 2 and a force F that acts at a right angle to the line connecting the center of the drive gear: 1 and the center of the movable gear: 2 and points in the direction of rotation.
₃ , can be disassembled.

Of the decomposed force, F ₁ is consumed by the rotary motion of the movable gear, and F ₃ becomes a propulsive force for moving the movable gear from the field.

Further, as shown in FIG. 3, the force acting in the direction of stopping the rotation / movement with respect to the rotation of the movable gear is, as shown in FIG. 3, two frictional forces generated in the movable gear: 2 and the movement support part: 3. The friction coefficient f ₁ of the product of the contact surface friction coefficient μ ₁ parallel to the ground, the movable gear weight and the gravitational acceleration, and the contact surface friction coefficient μ ₂ and F _{2 of the} part perpendicular to the ground.
The resulting frictional force f ₂ is the resultant force f ₃ .

[0010] The power of f ₅ is, as shown in FIG. 4, is decomposed into f ₅ which acts in a direction to prevent the frictional force f _4, and the movable gear thrust F ₃ acts in a direction to prevent rotation.

The force balance is F ₁ > f ₄ , and
Since the relationship of F ₃ > f ₅ is satisfied, the rotation of the driving gear 1 causes the rotation of the movable gear 2: 2 as well as the movement in the rotation direction.

When the drive gear 1 rotates counterclockwise when the gear train is viewed from above, the movable gear 2 also starts rotating clockwise as shown in FIG. At the same time, the movable gear: 2 starts moving in the very rotational direction as shown in FIG. 6, and as shown in FIG. 7, the driven gear: 3 contacts and the rotation is transmitted to the driven gear: 3.

When the drive gear 1 rotates clockwise when the gear train is viewed from above, the movable gear 2 also starts rotating counterclockwise as shown in FIG. The gear: 2 starts moving in the rotational direction as shown in FIG. 9, releases the contact of the driven gear: 3 as shown in FIG. 10, and stops the rotation transmission.

Further, one is to promote the increased friction of the contact tooth surface by connecting the drive gear and the movable gear with a spring together with the force acting in the longitudinal direction of the shaft hole generated by the rotation of the movable gear. As shown in FIG. 11, the drive gear: 1, the movable gear: 2, the driven gear: 3, and the movable gear: 2 are arbitrary arcs on the power generation side gear pitch circle and a concentric circle, as shown in FIG. It is composed of a moving support part 4 made to move along a locus, and a spring part 5 connecting the driving gear 1 and the movable gear 2:

When the gear train is viewed from the side, the rotating force acts at a right angle to the tooth surface contact point as shown in FIG. 2, and the force F _{1 in the} direction of rotation and the drive gear: 1 center And movable gear: It works in parallel with the line connecting the two centers, and the movable gear:
A force F ₂ that points to the center of ₂ and a force F that acts at a right angle to the line connecting the center of the driving gear 1 and the center of the movable gear 2 and that points in the direction of rotation.
₃ , can be disassembled.

Of the decomposed force, F ₁ is consumed in the rotary motion of the movable gear, and F ₃ becomes a propulsive force for moving the movable gear from the field.

Further, the frictional force f ₆ which is the product of the friction coefficient μ ₃ of the contact surface of the driving gear 1 and the movable gear 2 and the pressing force of the spring portion 5 stops the rotation as shown in FIG. The frictional force f ₇ acting in the direction and the force f ₈ acting as the movable gear propulsion force are decomposed.

The propulsive force resultant force F ₄ which is the sum of F ₃ and f ₈ becomes the propulsive force for moving the movable gear that is actually rotating, from the field.

Further, as shown in FIG. 13, the force acting in the direction of stopping the rotation / movement with respect to the rotation of the movable gear is as follows.
The frictional force generated in the movable gear: 2 and the movement support part: 3, the frictional force f _{2 which} is the product of the friction coefficient μ ₂ of the contact surface of the portion perpendicular to the ground and F ₂ , the drive gear: 1 and the movable gear: The resulting contact force f ₉ is the contact surface friction coefficient μ _{3 of 2} and the friction force f ₇ generated by the pressing force of the spring portion: 5.

As shown in FIG. 14, the force f ₉ is decomposed into a frictional force f ₁₀ acting in the direction of blocking rotation and a force f ₁₁ working in the direction of blocking the movable gear propulsion force F ₄ .

Since the force balance is F ₁ > f ₁₀ and F ₄ > f ₁₁ + movable gear: weight m of 2 × gravitational acceleration g, drive gear 1 rotates. By doing so, the movable gear 2 also rotates and moves in the rotation direction.

In actual operation, when the drive gear 1 rotates counterclockwise as viewed from the side of the gear train, the movable gear 2 also starts rotating clockwise as shown in FIG.
Simultaneously with the rotation, the movable gear: 2 starts to move in the rotation direction as shown in FIG. 16, and the driven gear: 3 contacts and the rotation is transmitted as shown in FIG.

When the drive gear 1 rotates clockwise as seen from the side of the gear train, as shown in FIG.
The movable gear: 2 also starts rotating in the counterclockwise direction. Simultaneously with the rotation, the movable gear: 2 starts moving in the rotation direction as shown in FIG. 19, and the driven gear: as shown in FIG.
The contact of 3 is released, and the transmission of rotation is stopped.

[0024]

The conventional example has the following drawbacks.

In the system in which the tooth flanks of the gear train are perpendicular to the ground and the weight of the movable gear is supported by bearings to reduce the force acting in the direction of blocking the propulsive force, the propulsive force is changed by the gear rotation. It is obtained by the transmission efficiency loss that occurs.

The transmission efficiency of gears is generally 97-95%.
The propulsive force obtained from this range is extremely small, and the relationship between the propulsive force and the force that blocks the propulsive force can easily be reversed by changing the load on the movable gear or changing the load depending on the gear train direction. It's easy to do.

In addition to the force acting in the longitudinal direction of the shaft hole generated by the rotation of the movable gear, the drive gear and the movable gear are connected by a spring to increase the friction of the contact tooth surface as a propulsion force. However, most of the propulsion force is obtained by the reaction force generated by applying friction brakes to the rotation of the gear, and the large propulsion force causes the propulsion force to be changed by changing the load of the movable gear or by changing the load depending on the direction of the gear train. Even if the blocking force becomes large, there is an advantage that it can not easily exceed the propulsion force, but since the tooth surfaces are brought into contact with each other by applying a load, there is no backlash,
As a result, wear damage is significantly generated on the tooth surface.

For the same reason, the noise due to gear rotation also becomes large.

[0029]

In order to solve the above problems, in a clutch mechanism by a gear that shifts a position of a movable gear in the middle of transmission to switch between power transmission and non-power transmission, a drive gear and a movable gear are used. And a movable support part which is formed so that the movable gear can move on an arbitrary arc locus on a circle concentric with the drive gear pitch circle and which applies pressure to the side surface of the movable gear.

[0030]

According to the present invention, in a clutch mechanism including a gear that moves a movable gear position in the middle of transmission to switch between power transmission and non-power transmission, a drive gear, a movable gear, and the movable gear are concentric with a drive gear pitch circle. Since it is formed so as to be able to move along any of the above arcuate loci and is constituted by a moving support portion that applies pressure to the movable gear side surface, it becomes possible to use friction on the side surface of the gear as a propulsive force.

As a result, most of the propulsion force is obtained by the reaction force of the friction brake with respect to the rotation of the gear, and because the propulsion force is large, by changing the load of the movable gear or changing the load depending on the direction of the gear train, Even if the force to block the propulsion force becomes large, the propulsion force cannot be easily exceeded, and since there is backlash, tooth surface wear damage is less likely to occur, and noise generated is small.

Further, since the side surface is pressed with a constant pressure, the movable gear with a large amount of lateral play always moves smoothly in parallel, and since the guide of the movable gear and the pressure generating portion are the same, the number of parts is reduced. Reduction is possible.

[0033]

Embodiments of the present invention will be described with reference to FIGS.

In the example of FIG. 21, the clutch mechanism by the gear that moves the movable gear position in the middle of the transmission to switch between power transmission and non-power transmission is a driving gear: 1, a movable gear: 2, and a driven gear: 3 and a movable support part 6, which is made so that the movable gear can move on an arbitrary arc locus on a circle concentric with the drive gear pitch circle and which applies pressure to the side surface of the movable gear.

When the gear train is viewed from the side, the rotating force acts at a right angle to the tooth contact point as shown in FIG. 2, and the force F _{1 in the} direction of rotation and the drive gear: 1 center And movable gear: It works in parallel with the line connecting the two centers, and the movable gear:
A force F ₂ that points to the center of 2 and a force F that acts at a right angle to the line connecting the center of the drive gear: 1 and the center of the movable gear: 2 and points in the direction of rotation.
_It can be disassembled into _three .

Of the decomposed force, F ₁ is consumed by the rotary motion of the movable gear, and F ₃ becomes a propulsive force for moving the movable gear from the field.

Also, the movable gear: 2 and the movement support part: 6
The frictional force f ₁₂ which is the product of the contact surface friction coefficient μ ₄ and the pressing force of the moving support portion 6 is, as shown in FIG. 22, the frictional force f ₁₃ acting in the direction to stop the rotation and the movable gear propulsion force. It is decomposed into force f ₁₄ .

The propulsive force resultant force F ₅ which is the sum of F ₃ and f ₁₄ becomes the propulsive force for moving the movable gear that is actually rotating, from the field.

Further, with respect to the rotation of the movable gear, the force acting in the direction of stopping the rotation / movement is as shown in FIG.
Movable gear: 2 and movement support part: 6, frictional force generated, frictional force f ₂ of product of contact surface friction coefficient μ ₂ and F ₂ at a portion perpendicular to the ground, movable gear: 2 and movement support part : The contact surface friction coefficient μ _{4 of} 6 and the friction force f ₁₃ generated by the pressing force of the moving support portion 6 are the resultant force f ₁₅ .

As shown in FIG. 24, the force of f ₁₅ is decomposed into a frictional force f ₁₆ acting in the direction of blocking the rotation and a force f ₁₇ acting in the direction of blocking the movable gear propulsion force F ₅ .

Since the force balance is F ₁ > f ₁₆ and F ₅ > f ₁₇ + movable gear: weight m of 2 × gravitational acceleration g, drive gear 1 rotates. As a result, the movable gear 2 also rotates and moves in the rotation direction.

In actual operation, as seen from the side of the gear train, when the drive gear 1 rotates counterclockwise, the movable gear 2 also starts rotating clockwise, as shown in FIG.
Simultaneously with the rotation, the movable gear: 2 starts moving in the rotation direction as shown in FIG. 26, and contacts and transmits the rotation to the driven gear: 3 as shown in FIG.

When the drive gear 1 rotates clockwise as seen from the side of the gear train, as shown in FIG. 28,
The movable gear: 2 also starts rotating counterclockwise, and at the same time as the rotation, the movable gear: 2 starts moving in the rotation direction as shown in FIG. 29, and the driven gear: 2 as shown in FIG.
The contact of 3 is released, and the transmission of rotation is stopped.

[0044]

EFFECTS OF THE INVENTION In a clutch mechanism by a gear that moves a movable gear position in the middle of transmission to switch between power transmission and non-power transmission, the drive gear, the movable gear, and the movable gear are concentric with the drive gear pitch circle. By making it possible to move along an arbitrary arc locus, and by configuring it with a moving support part that applies pressure to the side surface of the movable gear, it becomes possible to use the friction on the side surface of the gear as a propulsive force. It had an excellent effect.

(B) Most of the propulsion force is obtained by the reaction force of the friction brake with respect to the rotation of the gear. Since the propulsion force is large, the propulsion force is changed by changing the load of the movable gear or changing the load depending on the direction of the gear train. Even if the force to block the engine becomes large, it cannot easily exceed the propulsion force.

(B) Due to the structure having backlash, tooth surface wear damage is less likely to occur, and less noise is generated.

(C) Since the side surface is pressed with a constant pressure, the movement of the movable gear with a large amount of lateral play is always a smooth parallel movement, and the tooth surface is always perpendicular to the direction of force even at high speed rotation. Therefore, it is effective to improve the rotation transmission efficiency of the movable gear and to prevent the damage due to the abnormal tooth surface of the force transmission.

(D) Since the guide of the movable gear and the pressure generating portion are the same, the number of parts can be reduced, and a compact and inexpensive clutch mechanism can be provided.

[Brief description of drawings]

FIG. 1 is an isometric view showing an example of a conventional product.

FIG. 2 is a top view showing an example of a conventional product.

FIG. 3 is a sectional view showing an example of a conventional product.

FIG. 4 is a top view showing an example of a conventional product.

FIG. 5 is a top view showing an example of a conventional product.

FIG. 6 is a top view showing an example of a conventional product.

FIG. 7 is a top view showing an example of a conventional product.

FIG. 8 is a top view showing an example of a conventional product.

FIG. 9 is a top view showing an example of a conventional product.

FIG. 10 is a top view showing an example of a conventional product.

FIG. 11 is a side view showing an embodiment of still another conventional product.

FIG. 12 is a side view showing an embodiment of still another conventional product.

FIG. 13 is a sectional view showing an example of still another conventional product.

FIG. 14 is a side view showing an embodiment of still another conventional product.

FIG. 15 is a side view showing an embodiment of still another conventional product.

FIG. 16 is a side view showing an example of still another conventional product.

FIG. 17 is a side view showing an embodiment of still another conventional product.

FIG. 18 is a side view showing an embodiment of still another conventional product.

FIG. 19 is a side view showing an embodiment of still another conventional product.

FIG. 20 is a side view showing an example of still another conventional product.

FIG. 21 is a side view showing an embodiment of the present invention.

FIG. 22 is a side view showing an embodiment of the present invention.

FIG. 23 is a sectional view showing an example of the present invention.

FIG. 24 is a side view showing an embodiment of the present invention.

FIG. 25 is a side view showing an embodiment of the present invention.

FIG. 26 is a side view showing an embodiment of the present invention.

FIG. 27 is a side view showing an embodiment of the present invention.

FIG. 28 is a side view showing an embodiment of the present invention.

FIG. 29 is a side view showing an embodiment of the present invention.

FIG. 30 is a side view showing an embodiment of the present invention.

[Explanation of symbols]

 1 Drive Gear 2 Movable Gear 3 Driven Gear 4 Movement Support Part 5 Spring Part 6 Movement Support Part for Applying Pressure to Side of Movable Gear

Claims (1)

[Claims] 1. In a gear train for transmitting power, a drive gear, a movable gear, and the movable gear are made so as to be able to move on an arbitrary arc locus on a circle concentric with the drive gear pitch circle, and pressure is applied to the side surface of the movable gear. A clutch mechanism configured by a moving support unit that gives the.