JP3392161B2 - Driving force transmission mechanism - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving force transmitting mechanism, and more particularly, to a structure of a driving force transmitting mechanism for selecting and driving one of a plurality of driven gears using a planetary gear.

[0002]

2. Description of the Related Art In a conventional driving force transmission mechanism using a planetary gear, the applicant previously proposed Japanese Patent Application No. 4-6054.
As shown in FIG. 6, the planetary gear mechanism, which is the driving force transmission mechanism of No. 8, rotates the sun gear 21 in one direction to rotate the planetary gear 22.
Driven gear A23 or driven gear B2
4 is selected, and the selected driven gear A23, or
This is a mechanism for transmitting the driving force to the driven gear B24.

In this drive mechanism, for example, the sun gear 2
When 1 rotates in the counterclockwise direction, the planetary gear 22 revolves counterclockwise on the rotation radius orbit 22d around the sun gear 21, stops meshing with the driven gear B24, and moves toward the driven gear A23. Go to. Then, the driven gear A2
3, the drive force of the sun gear 21 is transmitted to the driven gear A23 via the planetary gear 22. In addition,
State shown in FIG. 6, the driven gear A23 and the planetary gear 22 is in a state not completely engaged, the can and normally driven <br/> is the gear 22 is meshed with each other It is in a state.

[0004]

However, as shown in FIG. 6, in the planetary gear mechanism of the above-mentioned Japanese Patent Application No. 4-60548, the planetary gear 22 rotates counterclockwise in order to switch the drive system. At this time, if the tooth portion of the driven gear A23 is located between the tooth position 23a (solid line) and the tooth position 23b (broken line) shown in the figure, and the planetary gear 22 is in the position shown in the figure, As shown in FIG. 7, which is an enlarged view, the tooth tips of the gears interfere with each other by two teeth, and the planetary gear 22 cannot rotate or revolve.

In such a state, if the torque applied to the sun gear 21 is small, the drive system will stop. If the torque is large, the tooth portion of any one of the sun gear 21, the planetary gear 22, and the driven gear A23,
Alternatively, the plurality of teeth may be deformed or damaged. Then, even when the deformation of the teeth is completed within the elastic range, there is a problem that an abnormal sound is generated.

The present invention has been made to solve the above-mentioned problems, and in a driving force transmission mechanism using a planetary gear, when the drive system is switched, the planetary gear and the driven gear are separated from each other. It is an object of the present invention to provide a driving force transmission mechanism capable of smooth switching without causing interference during meshing.

[0007]

A driving force transmission mechanism according to the present invention comprises a single motor, a sun gear driven by the motor, and a planetary gear that is constantly meshed with the sun gear.
A plurality of driven gears arranged on the revolution path of the planetary gear are provided, and a driven gear that meshes with the planetary gear is selected by the revolution of the planetary gear, and the planetary gear is rotated in that state. in the driving force transmission mechanism for transmitting the driving force to the driven gear by, provided in the revolution locus of the planetary gear between the plurality of the driven gear, in contact with the planetary gear in the revolution, the appropriate When you leave the contact state
The orbit of the planet gear is revolved while rotating , and the planet teeth are rotated at the start of meshing with the driven gear.
Mutual tips of the car and the driven gear are
Regardless of the state, a predetermined number of times that can always engage without interference
Characterized by comprising rotational position regulating member for regulating setting the planetary gear translocation state, the rotational position regulating member
Is the protruding position and upper
Change to a retracted retracted position outside the orbital trajectory of the planetary gears.
Is installed so that the protruding position is
Number of driven gears in contact with the tip circle of one driven gear
The planetary gears in the state
It is characterized by being placed.

[0008]

[Operation] In the above structure, the rotation position restricting member is brought into contact with the revolving planetary gear to rotate the planetary gear to a predetermined rotation position, thereby rotating the planetary gear to drive the driven gear. The position state of the planetary gears at the start of meshing with is brought into a phase capable of meshing with the driven gears, and the driven gears and the planetary gears are meshed well. Well
In addition, the above-mentioned rotational position regulating member is located within the revolution trajectory of the planetary gear.
Projected position and retracted position outside the orbit of the planetary gear
It can be displaced to the position of one of the driven gears.
Tooth of planet gear in contact with tip circle of driven gear
It is placed so that it is inside the front circle.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a layout view of a driving force transmission mechanism of the present invention,
The drive force transmission mechanism is a motor 6 that drives the sun gear 1.
Driven by the sun gear 1, the planetary gear 2 meshed with the sun gear 1, and held around the sun gear 1 in a state capable of revolving and rotating along a revolution path 2d; Possible driven gear A3 and driven gear B4
And the planetary gear 2 between the driven gear A3 and the driven gear B4.
The rotation position regulating member 5 is in the revolution locus 2a of the tip circle and is capable of contacting the tooth portion of the planetary gear 2.

The tip portion 5a of the rotational position regulating member 5
Is outside the region of the addendum circle 2b of the planetary gear 2 that is in contact with the addendum circle 4a of the driven gear B4, and is the region of the addendum circle 2c of the planetary gear 2 that is in contact with the addendum circle 3a of the driven gear A3. Of the planetary gear 2 and the revolution path 2a of the tip circle of the planetary gear 2 as described above.
It is located inside. Therefore, when the rotational position restricting member 5 and the planetary gear 2 are in contact with each other, the driven gear A3 or the driven gear B4 and the planetary gear 2 are not in mesh with each other.

When the planetary gear 2 moves from the meshing position with the driven gear B4 to the meshing position with the driven gear A3, the planetary gear 2 is always brought into contact with the rotation position regulating member 5 and is driven in a predetermined rotation. pass. The predetermined rotation drive is
When the planetary gear 2 is rotated to the meshable phase with the driven gear A3, the rotation is driven to a phase in which the tooth tips of the planetary gears 2 can mesh with each other without interfering with each other. The stop phase when the driven gear A3 is disengaged from the planetary gear 2 is
When trying to mesh again, the phase is set to be meshable.

Next, the actual movement of the driving force transmission mechanism of the present embodiment constructed as described above will be explained step by step. When switching to the driven state of the driven gear A3, first, the planetary gear 2 meshing with the driven gear B4 revolves by the counterclockwise rotation of the sun gear 1 and moves toward the driven gear A3. On the way, the planetary gear 2 comes into contact with the rotational position restricting member 5 (see FIG. 1). After that, the planetary gear 2 revolves while rotating on its axis. When it is separated from the rotation position restricting member 5, the rotation position is in a rotation restricted state as shown in the operation diagram of FIG. After that, the planetary gear 2 revolves while maintaining the rotational position regulation state of FIG. 2 and meshes with the driven gear A3 without interference as shown in the operation diagram of FIG.

In the above description of the operation, only the meshing operation between the planetary gear 2 and the driven gear A3 has been described, but conversely, in the meshing operation between the planetary gear 2 and the driven gear B4, the rotational position is the same. The restricting member 5 acts to allow normal meshing, and it is possible to prevent meshing failure.

As described above, in the driving force transmission mechanism of the conventional example, the planetary gear 2 is in the rotational position 2 (B) (shown by the broken line in FIG. 3) causing the tooth interference, and the gears are not in contact with each other. Although the meshing may not be performed smoothly in some cases, in the mechanism of the present embodiment, by providing the rotation position restricting member 5 as described above, the planetary gear 2 passes through the rotation position restricting member 5 and is then restricted in rotation. The position 2 (A) (shown by the solid line in FIG. 3) is held and abutted on the driven gear A3. Then, the normal meshing can be performed, and the meshing failure can be prevented.

Next, the driving force transmission mechanism of the second embodiment will be described. The driving force transmission mechanism of this embodiment is different from the mechanism of the first embodiment in that the driven gear A13 and the driven gear B are driven.
As shown in the layout diagram of FIG. 4, there is only a narrow region 20 indicated by diagonal lines as a region where the arrangement intervals of 14 are narrow and the rotation position restricting member 5 in the mechanism of the first embodiment is provided. It is applied to a drive mechanism in which the function of position regulation cannot be achieved.

That is, the mechanism of this embodiment has a driven gear A1.
Tip circle 12c of planetary gear 12 in contact with tip circle 13a of No. 3
A region surrounded by a tip circle 12b of the planetary gear 12 that contacts the tip circle 14a of the driven gear B14, and a revolution trajectory 12a of the tip circle during revolution along the revolution trajectory 12d of the planet gear 12. This is applied to a case where 20 is narrow and is not sufficient to rotate the planetary gear 12 to an appropriate position by the fixed and supported rotation position restricting member.

As shown in FIG. 4, the rotational position restricting member 15 in the driving force transmitting mechanism of this embodiment is slidably held by the guide 17 in the E direction in which the planetary gear 12 is located, and is rotated by the spring 16 in the E direction. Has been pressed. The protruding position is regulated by the guide 17. In addition, the protrusion restricting position of the rotation position restricting member 15 is within the revolution locus 12a of the planetary gear 12 and outside the addendum circle 12c of the planetary gear 12, which is in contact with the addendum circle 13a of the driven gear A13,
Further, it is located inside the addendum circle 12b of the planetary gear 12, which is in contact with the addendum circle 14a of the driven gear B14. Further, the rotation position restricting member 15 can be retracted to a position 15 (A) that is out of the revolution trajectory of the planetary gear 12.

The actual movement of the driving force transmission mechanism of the present embodiment constructed as described above will be explained step by step. When the sun gear 11 rotates counterclockwise, the planets meshed with the driven gear B14. The gear 12 revolves counterclockwise while rotating clockwise. Then, the driven gear B14
Before it separates from, it comes into contact with the rotational position restricting member 15. When the drive torque of the driven gear B14 at this time and the torque due to the spring biasing force of the spring 16 of the rotational position restricting member 15 are compared on the rotational load torque of the planetary gear 12, drive torque> torque due to the spring biasing force. The spring biasing force is set so that

Therefore, when the rotational position restricting member 15 contacts the planetary gear 12, the rotating position restricting member 15 begins to retract. FIG. 5A is an operation diagram showing the retracted state of the rotational position restricting member 15. Further, withdrawal from FIG. 5B to FIG. 5C is continued, and after the planetary gear 12 and the driven gear B14 are completely disengaged, the planet gear 12 is returned to the normal position (FIG. 5D). reference).

A frictional force is applied to the planetary gear 12 in order to revolve it. If the frictional torque due to the frictional force is set such that frictional torque> torque due to spring biasing force, The subsequent operation is exactly the same as that of the first embodiment. That is, in FIG. 4, when the planetary gear 12 continues to rotate and reaches a position where it can mesh with the driven gear A13, the teeth of the driven gear A13 and the teeth of the planetary gear 12 mesh with each other without interfering with each other. be able to.

As described above, according to the driving force transmission mechanism of this embodiment, even if the distance between the plurality of driven gears is small, the driving force of the planetary gears does not cause interference of the teeth in a smaller space. A transmission mechanism can be obtained. In the mechanism of this embodiment, the rotation position restricting member 15 and the spring 16 are divided into two members, but as a modification of the rotation position restricting member, the rotation position restricting member itself is formed of an integrally formed elastic body. If so, the same effect can be obtained with a simpler drive mechanism.

[0022]

As described above , according to the present invention, in the driving meshing state, the tooth tips of the planetary gear and the driven gear are not clogged, and it is possible to prevent the meshing failure. Therefore, the generation of abnormal sound can be eliminated.

[Brief description of drawings]

FIG. 1 is a layout view of a driving force transmission mechanism according to a first embodiment of the present invention.

FIG. 2 is an operation diagram showing an operating state of a rotation position restricting member of the driving force transmission mechanism of FIG.

3 is an operation diagram showing a meshing state of a driven gear and a planetary gear of the driving force transmission mechanism of FIG.

FIG. 4 is a layout view of a driving force transmission mechanism according to a second embodiment of the present invention.

5 is an operation diagram showing an operating state of a rotation position restricting member of the driving force transmission mechanism of FIG. 4, (A) showing a state where a planetary gear is in contact with the rotation position restricting member, (B), ( FIG. 6C is an operation diagram showing a state in which the rotational position restricting member is gradually pressed, and FIG. 6D is a state in which the rotational position restricting member is released from the planetary gear.

FIG. 6 is a layout view of a conventional driving force transmission mechanism.

7 is an enlarged operation diagram of the driving force transmission mechanism of FIG. 6 in a state where the tooth portions of the planetary gear and the driven gear interfere with each other.

[Explanation of symbols]

1,11 ………………………… sun gear 2,22 …………………… Planetary gears 3,23 …………………… Driven gear A (driven gear) 4, 24 ............... Driven gear B (driven gear) 5,15 ………………………… Rotation position control member

Continuation of the front page (56) Reference JP-A-1-172657 (JP, A) JP-A-4-258937 (JP, A) Actual Kaihei 2-38548 (JP, U) Actual Kohei 1-34776 (JP , Y2) (58) Fields investigated (Int.Cl. ⁷ , DB name) F16H 37/06 F16H 1/28 G03B 17/00

Claims (2)

(57) [Claims] 1. A single motor, a sun gear driven by this motor, a planetary gear constantly meshing with the sun gear, and a plurality of driven gears arranged on the revolution locus of the planetary gear. A driving force transmission mechanism that comprises a driven gear that meshes with the planetary gear by the revolution of the planetary gear, and transmits a driving force to the driven gear by rotating the planetary gear in the state. It is provided in the revolution path of the planetary gear between the plurality of driven gears and comes into contact with the planetary gear that is revolving,
While rotating the planetary gear until it leaves the state of
The planet gear and the driven gear are reciprocally rotated and the planet gear and the driven gear are reciprocated at the start of meshing with the driven gear by the revolution of the planet gear.
Regardless of the state of the driven gear above, the tooth tip does not always interfere.
Set the planetary gears in the specified rotational position so that they can mesh.
A driving force transmission mechanism comprising a rotational position regulating member for controlling and setting . 2. The rotation position restricting member is the planetary gear.
Of the planetary gear above
It is provided so that it can be displaced to a retracted retracted position outside the trajectory.
And the protruding position of the plurality of driven gears is
The above play in a state where it is in contact with the tip circle of one driven gear
Must be placed inside the tip circle of the star gear
The driving force transmission mechanism according to claim 1 .