JPH1151092A - Driving mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a driving mechanism capable of fixing a member to be driven with a small, simple structure and high fixing force without employing an electromagnetic clutch and allowing low driving force for moving the member to be driven. SOLUTION: This driving mechanism is provided with a cylindrical outer race 21, an inner race 30 turnably provided in the outer race 21 and installing a member to be driven, and a levers 42 inserted in a gap formed between the outer race 21 and the inner race 30 and rotationally moving along the inner peripheral surface 21A of the outer race 21. In the driving mechanism, rotationally moving the levers 42 by means of a motor rotationally moves the inner race 30 to move the member to be driven. The driving mechanism is provided with rollers 49, 50 cutting into the gap formed between the outer race 21 and the inner race 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive mechanism used for, for example, an electric retractable mirror for a vehicle.

[0002]

2. Description of the Related Art Recently, an electric retractable mirror mounted on a vehicle has been proposed. Such an electric storage mirror can move the mirror to a storage position so as not to be obstructed when parking, and can move from the storage position to a use position when traveling. The mirror is configured to be moved by a motor so that the mirror can be operated from a driver's seat.

Incidentally, it is necessary to fix the mirror at a use position so that the mirror does not move due to vibration of the vehicle when used, and it is desirable that the mirror can be moved with a small driving force when stored.

[0004]

For this reason, it is conceivable to provide a drive mechanism using an electromagnetic clutch. However, wiring for the electromagnetic clutch is required, and the system becomes complicated and expensive. Further, when the fixing force of the mirror is increased, there is a problem that the clutch body becomes large.

In the case of a friction clutch utilizing surface frictional force, a large pressing force is required if a small clutch is used to obtain a large fixing force, so that the frictional force is eliminated and the mirror is brought into a free state. Requires a large reaction force to move the clutch plate against the pressing pressure load, and as a result, there is a problem that the clutch portion becomes large.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to be able to fix a driven member with a large fixing force with a simple structure without using an electromagnetic clutch or the like. It is an object of the present invention to provide a driving mechanism that can move a driven member with a small driving force and can reduce the size.

[0007]

In order to achieve the above object, an invention according to claim 1 includes a ring-shaped outer race,
An inner race provided rotatably in the outer race and having a driven member attached thereto, and inserted into a gap formed between the outer race and the inner race and along an inner peripheral surface of the outer race. And a release member that rotates the inner race by rotating the release member by a motor to move the driven member, wherein a biting means that bites into the gap is provided. This biting means cuts into the gap when only the inner race rotates relative to the outer race to prevent rotation of the inner race, and when the release member is rotated by a motor, It is characterized in that biting into the inner race is released and the inner race rotates.

According to a second aspect of the present invention, the biting means includes a first biting member which bites into the gap when the inner race rotates clockwise, and a counterclockwise rotation of the inner race. The second that bites into the gap when moving
A bite member, wherein the release member releases the bite into the gap of the first bite member when rotated clockwise to allow the inner race to rotate clockwise,
When the release member rotates in the counterclockwise direction, the second bite member is released from biting into the gap, thereby enabling the inner race to rotate in the counterclockwise direction.

A third aspect of the present invention is characterized in that the first and second bite members are constituted by rollers.

According to a fourth aspect of the present invention, the release member comprises:
It is characterized in that three or more odd numbers are provided at equal intervals around the center axis of the inner race, and the first and second biting members are arranged at positions sandwiching each release member.

According to a fifth aspect of the present invention, the elastic member for urging the first and second biting members in the direction of biting into the gap is provided between the first biting member of the biting means and the elastic member of the other biting means. It is characterized by being provided between two bite members.

The invention according to claim 6 is characterized in that a space for filling a lubricant is provided in a portion where the elastic body is provided.

According to a seventh aspect of the present invention, the outer race comprises an inner first ring member and an outer second ring member, and the first ring member is formed of metal, and the second ring member is synthesized. It is characterized by being formed of resin.

According to an eighth aspect of the present invention, a gear mechanism for transmitting the driving force of the motor to rotate the release member is provided, and the gear mechanism is provided between the release member and the biting means. The present invention is characterized in that a clearance larger than a rotational movement amount of the release member due to backlash is provided.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an electric vehicle retractable mirror provided with a drive mechanism according to the present invention.

[First Embodiment] In FIGS. 1 to 3, reference numeral 1 denotes a vehicle body, and reference numeral 2 denotes an electric retractable mirror mounted on the vehicle body 1.

The electric retractable mirror 2 comprises a mirror (driven member) 4 attached to a rotating shaft 3 and a driving mechanism 10 for moving the mirror 4. The drive mechanism 10 is provided on a base member 11 attached to the vehicle body 1 and is covered by a cover case 12.

As shown in FIGS. 4 and 5, the drive mechanism 10 is formed integrally with a fixed plate 20 fixed to the base member 11 and has a cylindrical outer race 21 having an open top.
And an inner race 30 rotatably arranged in the outer race 21 and a release lever plate 40.

As shown in FIG. 6, a rotating shaft 3 is attached to the inner race 30, and guide portions 31, 32 are formed at positions sandwiching the rotating shaft 3. The inner peripheral surface 21A of the outer race 21 is provided on the guide portions 31 and 32.
Guide surface 31 formed in an arc shape and facing
A, 32A are formed, and the inner race 30 can be smoothly rotated in the outer race 21 by the guide surfaces 31A, 32A.

In the inner race 30, recesses 33, 33 are formed in a direction orthogonal to a line connecting the guide portions 31, 32 and at a position sandwiching the rotating shaft 3, and the recesses 33, 33 are formed. Flat holding surfaces 35 and 36
Are formed. The separation distance L between the holding surfaces 35, 36 and the inner peripheral surface 21A of the outer race 21 is set so as to increase as the distance from the recesses 33, 33 along the circumferential direction increases to an intermediate position between the holding surfaces 35, 36. Is set. Then, the retaining surfaces 35 and 36 are continuously connected to the retaining surfaces 3.
7A and 37B are formed, and the holding surfaces 35 and 36 and the locking surface 37 are formed.
A and 37B are almost orthogonal.

The release lever plate 40 covers the upper opening of the outer race 21 and is formed integrally with a disk 41 through which the rotation shaft 3 is rotatably penetrated and protrudes downward from the lower surface 41A of the disk 41. And a pair of levers (release members) 42. A gear 44 is formed around the outer periphery of the disk 41, and the gear 44 meshes with a drive gear 45 described later, and the rotation of the drive gear 45 causes the disk 41 to relatively rotate with respect to the rotation shaft 3. It is going to go.

The lever 42 has a fan-shaped lever portion 46 inserted into a space formed between the outer race 21 and the concave portion 33 of the inner race 30. The lever portion 46 is formed continuously with the lever portion 46 and has the concave portion 33. And a projection 43 loosely fitted therein. Both sides of the lever portion 46 have tapered surfaces 4 so that the width becomes narrower toward the rotation shaft 3 side.
6A and 46B, and a guide surface 46C formed in an arc shape so that the outside of the lever portion 46 can move along the inner peripheral surface 21A of the outer race 21.

Further, leaf springs (elastic bodies) 47 and 48 and cylindrical rollers 49 and 50 are disposed in a space formed between the outer race 21 and the holding surfaces 35 and 36 of the inner race 30, One ends 47A, 48A of the leaf springs 47, 48 are attached to the locking surfaces 37A, 37B of the inner race 30. The leaf springs 47, 48 urge the rollers 49, 50 toward the tapered surfaces 46A, 46B of the lever portion 46. That is, the rollers 49 and 50 are formed between the inner peripheral surface 21A of the outer race 21 and the locking surfaces 37A and 3 of the inner race 30.
7B.

When a force that rotates, for example, clockwise acts on the inner race 30, the roller 49 further penetrates between the inner peripheral surface 21A of the outer race 21 and the holding surface 35A of the inner race 30. The inner race 30 cannot rotate, and the fixed state of the inner race 30 is maintained. The same is true when a counterclockwise rotating force acts on the inner race 30.

When the release lever plate 40 rotates clockwise, for example, the lever 42 moves the roller 49 to the locking surface 37A against the urging force of the leaf spring 47. The bite is released, and the inner race 30 rotates clockwise together with the release lever plate 40. In addition, the rotation of the inner race 30 in the clockwise direction cancels the biting of the roller 50, so that the rotation of the inner race 30 in the clockwise direction is not hindered.

The same applies to the case where the release lever plate 40 rotates counterclockwise.

The drive gear 45 includes a drive shaft 61 of a motor 60.
The motor 60 is mounted on a bracket 62 mounted on the base member 11, as shown in FIG.

FIG. 7 shows the configuration of a control system for controlling the motor 60. In FIG. 7, reference numeral 63 denotes a power supply (battery), 64 denotes an operation switch for rotating the motor 60 forward / reverse, and 65 denotes a control circuit for rotating the motor 60 forward or reverse based on the operation of the operation switch 64.

Next, the operation of the vehicle electric retractable mirror of the above embodiment will be described.

For example, when the mirror 4 is fixed at the retracted position (the position where the mirror 4 comes into contact with the vehicle body 1), the inner race 30 and the release lever plate 40
The lever 42 and the rollers 49, 50 are in the state shown in FIG.

When the mirror 4 at the storage position is moved to, for example, the position shown in FIGS. 1 and 2, the operation switch 64 is operated to rotate the motor 60 forward. When the motor 60 starts to rotate forward, the release lever plate 40 starts to rotate clockwise (in FIG. 2) via the drive gear 45. The clockwise rotation of the release lever plate 40 causes the lever portion 46 of the lever 42 of the release lever plate 40 to push the roller 49 against the urging force of the leaf spring 47, thereby causing the inner race 30 to rotate, as shown in FIG. Since the roller 49 is moved to the locking surface 37A side, the biting of the roller 49 is released.

Then, the bite of the roller 49 is released, and the projection 43 of the lever 42 of the release lever plate 40 is moved to the side 33 of the recess 33 of the inner race 30.
8A, the inner race 30 is rotated in the direction of the arrow (clockwise) shown in FIG. With the rotation of the inner race 30, the rotation shaft 3 rotates clockwise, and the mirror 4 is moved from the storage position to the position shown in FIGS.

When the mirror 4 moves to the position shown in FIGS. 1 and 2, the operation of the operation switch 64 is stopped. As a result, the driving of the motor 60 is stopped, and the mirror 4 is stopped at the position shown in FIGS.

When the driving of the motor 60 is stopped, the positional relationship between the inner race 30 and the lever 42 of the release lever plate 40 is brought to the state shown in FIG.

In this state, when an external force is applied to the mirror 4 and the drive shaft 3 rotates left and right, the inner race 30 rotates right and left together with the drive shaft 3. The rotation of the inner race 30 in the left-right direction causes the rollers 50 and 4 to rotate.
Since 9 digs into between the inner peripheral surface 21A of the outer race 21 and the holding surfaces 36A, 35A of the inner race 30, the inner race 30 cannot rotate, and as a result, the inner race 30 It remains fixed.

That is, since a fixing force for fixing the inner race 30 is generated by the rollers 50 and 49, the mirror 4 is prevented from turning left or right even when an external force is applied to the mirror 4. You. Even if the mirror 4 is stopped at another arbitrary position, it is fixed at the arbitrary position as described above.

When the mirror 4 is stored, the operation switch 64 is operated to rotate the motor 60 in the reverse direction. The reverse rotation of the motor 60 causes the release lever plate 40 to rotate in the counterclockwise direction, releasing the engagement of the roller 50 in the same manner as described above, and rotating the inner race 30 and the rotating shaft 3 in the counterclockwise direction. The mirror 4 moves to the storage position.

As described above, when the release lever plate 40 is rotated by the motor 60, the bites of the rollers 49, 50 are released, so that the inner race 3 is driven with a small driving force.
0 and the rotating shaft 3 can be rotated. That is, the mirror 4 can be rotated with a small driving force. When the mirror 4 is rotated by receiving an external force,
Since the rollers 49 and 50 bite between the inner peripheral surface 21A of the outer race 21 and the holding surfaces 36A and 35A of the inner race 30, the inner race 30 is further fixed, and the inner race 30 has a large fixing force. Fixed at. That is, the mirror 4 can be fixed with a large fixing force.

In this embodiment, the inner race 30 is rotatably disposed in the outer race 21, and rollers 49, 50 and leaf springs 47, 48 are provided between the outer race 21 and the inner race 30. Release lever plate 4
Since only the zero lever 42 is disposed, the structure is simple, and the size of the apparatus can be reduced. In addition, since an electromagnetic clutch or the like is not used, the weight of the device can be reduced, and there is no need to provide complicated wiring for the electromagnetic clutch.

[Second Embodiment] FIGS. 9 and 10 show a second embodiment.
Embodiment 2 is shown, and in this second embodiment,
In the inner race 30 rotatably disposed in the outer race 21, three recesses 33 are formed at equal intervals, and between the recess 33 and the inner peripheral surface 21 </ b> A of the outer race 21, the release lever plate 40 is provided. The three provided levers 42 are inserted, and a pair of leaf springs 47 and 48 and rollers 49 and 50 are arranged at positions sandwiching the levers 42.

According to the second embodiment, three rollers 4
The rotation of the inner race 30 is prevented by the engagement of the inner race 9 or the roller 50. However, since the three rollers 49 or the roller 50 that do not bite are not located on the same straight line passing through the center of the rotation shaft 3, the inner race 30 is rotated. Even if an external force is applied to the inner race 30, the load for fixing the inner race 30 is not unevenly distributed but balanced. For this reason, the inner race 30 is not pinched by the load from the same straight line. That is, inner race 3
0 is prevented from being fixed in the outer race 21.

In this embodiment, the pair of rollers 49 and 50 are arranged at three places. However, similar effects can be obtained even if they are arranged at odd places such as five places or seven places.

[Third Embodiment] FIGS. 11 and 12 show a third embodiment. In FIGS. 11 and 12, reference numeral 70 denotes an inner race rotatably arranged in the outer race 21.
Has a cylindrical portion 71, and three concave portions 72 are formed at equal intervals on the outer peripheral surface of the cylindrical portion 71. Cylindrical part 71
A disk 73 having a diameter larger than the diameter of the cylindrical portion 71
Are formed integrally with each other, and an arc-shaped guide portion 74 is formed on the peripheral end side of the disk 73 and is located between the concave portions 72 and protrudes upward. The guide portion 74 allows the inner race 70 to smoothly rotate within the outer race 21.

A silicone rubber 75 is attached between the guide portion 74 and the cylindrical portion 71, and the rollers 49, 50 are urged toward the lever 42 of the release lever plate 40 by the silicone rubber 75. The distance L between the outer peripheral surface 71A of the cylindrical portion 71 and the inner peripheral surface 21A of the outer race 21 is set to be smaller as approaching the concave portion 72 side as in the first embodiment.

According to the third embodiment, in addition to obtaining the same effect as the second embodiment, the number of parts is small since the rollers 49, 50 are urged in the biting direction by one silicon rubber 75. I'm done. Further, since it is not necessary to form the locking surfaces 37A, 37B (see FIG. 6) for locking the leaf springs 47, 48, the shape of the inner race 70 can be simplified.

Further, since the urging force applied to the rollers 49 and 50 can be set by the hardness and volume of the silicon rubber 75, the rollers 49 and 50 can be stably maintained even with a small stroke.
A pressing load of 50 can be obtained. In addition, since the silicon rubber 75 can be manufactured by molding, it can be molded according to the shape of the mounting space.
The mounting work can be simplified.

Fourth Embodiment FIGS. 13 and 14 show a fourth embodiment. In FIGS. 13 and 14, reference numeral 80 denotes an inner race rotatably arranged in the outer race 21.
Are formed at regular intervals on the outer peripheral surface of the. Reference numeral 82 denotes five levers formed on the disk 41 of the release lever plate 40. The lever 82 is provided with a projection 84 which is loosely fitted in the recess 81 of the inner race 80.
And a fan-shaped lever portion 85.

The trapezoidal silicon rubber 8 is provided on the outer peripheral surface between the concave portions 81 of the inner race 80.
The rollers 49 and 50 are moved by the silicon rubber 86 to the levers 8 of the release lever plate 40.
It is biased to two sides. A space 87 having a predetermined size is formed between the silicone rubber 86 and the inner peripheral surface 21A of the outer race 21 of the outer race 22.
The space 87 is filled with grease 88 as shown in FIG. The grease 88 suppresses the friction during rotation of the inner race 80 to be small.

According to the fourth embodiment, in addition to obtaining the same effect as the second embodiment, the structure of the inner race 80 can be made very simple.

[Fifth Embodiment] FIGS. 16 and 17 show a fifth embodiment. In the fifth embodiment,
In addition to obtaining the same effects as in the second embodiment, the outer race 90 has a double structure to reduce the weight of the outer race 90, and a predetermined fixing force for fixing the inner race 30 is obtained. Things.

The outer race 90 is composed of a cylindrical portion 92 formed on a fixed plate 91 and a metal cylindrical member 93 mounted in the cylindrical portion 92.
1 and the cylindrical portion 92 are integrally formed of resin. The outer periphery of the cylindrical member 93 is knurled, and the cylindrical member 93 is attached to the cylindrical portion 92 by insert molding. The knurling of the cylindrical member 93 prevents rotation in the cylindrical portion 92.

[Sixth Embodiment] FIGS. 18 and 19 show a sixth embodiment. In the sixth embodiment, between the tapered surface 46A of the lever portion 46 and the roller 49,
And clearances 100A, 100B having a predetermined width d between the tapered surface 46B of the lever portion 46 and the roller 50.
Are provided respectively. The rotation angle of the lever 46 from the state where the roller 49 bites into the state shown in FIG. 18 to the state where the roller 49 bites into the state shown by the solid line in FIG. Assuming that the rotation angle corresponding to the amount of rotation movement of the lever 46 by β is β, the predetermined width d is set such that α is larger than β.

According to the sixth embodiment, for example, even if the lever 46 is rotated clockwise by the rotation angle β due to the backlash due to the influence of vibration, the gap 100A is set so that α becomes larger than β. Is provided, the tapered surface 46A of the lever portion 46 does not contact the roller 49.
As a result, the bite of the roller 49 is not released by the backlash, and the fixed state of the inner race 30 is reliably maintained. The same applies to a case where the lever 46 rotates counterclockwise.

When the inner race 30 is rotated by driving the motor 60 to stop the motor 60,
Since the inner race 30 that moves integrally with the mirror 4 slightly stops due to its inertia and then stops, the lever portion 46 is at an equal distance from the rollers 49 and 50 in the fixed state of the inner race 30 as shown in FIG. Line M at
It is located near.

In each of the embodiments described above, the drive mechanism for moving the mirror 4 has been described. However, the present invention is not limited to this, and it is needless to say that the present invention can be applied to, for example, a lamp which is mounted outside the vehicle body so that the optical axis can be adjusted. is there.

[0056]

As described above, according to the present invention, the driven member can be rotated with a small driving force, and the driven member can be fixed with a large fixing force. In addition, since the inner race is rotatably arranged in the outer race and the release member and the biting means are provided in the gap formed between the outer race and the inner race, the structure is simple. The size of the device can be reduced. In addition, since an electromagnetic clutch or the like is not used, the weight of the device can be reduced, and there is no need to provide complicated wiring for the electromagnetic clutch.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an electric vehicle retractable mirror to which a drive mechanism according to the present invention is applied.

FIG. 2 is a perspective view showing a configuration of a vehicle electric retractable mirror of FIG. 1;

FIG. 3 is a side view showing a driving mechanism.

FIG. 4 is a sectional view showing a configuration of a driving mechanism.

FIG. 5 is an exploded perspective view showing a configuration of a driving mechanism.

FIG. 6 is a plan view showing a configuration of a driving mechanism.

FIG. 7 is a block diagram showing a configuration of a control system of the drive mechanism.

FIG. 8 is an explanatory view showing a state in which the engagement of the rollers has been released and a rotating direction of the inner race.

FIG. 9 is an exploded perspective view illustrating a configuration of a driving mechanism according to a second embodiment.

FIG. 10 is a plan view illustrating a configuration of a drive mechanism according to a second embodiment.

FIG. 11 is an exploded perspective view illustrating a configuration of a drive mechanism according to a third embodiment.

FIG. 12 is a plan view illustrating a configuration of a drive mechanism according to a third embodiment.

FIG. 13 is an exploded perspective view illustrating a configuration of a drive mechanism according to a fourth embodiment.

FIG. 14 is a plan view illustrating a configuration of a drive mechanism according to a fourth embodiment.

FIG. 15 is a partially enlarged view in which a part of FIG. 14 is enlarged.

FIG. 16 is an exploded perspective view illustrating a configuration of a drive mechanism according to a fifth embodiment.

FIG. 17 is a plan view illustrating a configuration of a drive mechanism according to a fifth embodiment.

FIG. 18 is a plan view illustrating a configuration of a drive mechanism according to a sixth embodiment.

FIG. 19 is an explanatory view showing a state in which the lever unit is rotated by the drive mechanism of FIG. 18;

[Explanation of symbols]

 21 outer race 21A inner peripheral surface 30 inner race 42 lever 49 roller 50 roller

Claims (8)

[Claims] 1. An outer race having a cylindrical shape, an inner race rotatably provided in the outer race and having a driven member attached thereto, and inserted into a gap formed between the outer race and the inner race. And a release member that rotates along the inner peripheral surface of the outer race, and a drive mechanism that rotates the inner race by moving the release member with a motor to move the driven member. It is provided with a biting means that bites into the gap, this biting means bites into the gap when only the inner race rotates relative to the outer race, and prevents rotation of the inner race, When the release member is rotated by the motor, the bite into the gap is released and the release member rotates with the inner race. Driving mechanism for the butterflies. A second biting member which bites into the gap when the inner race rotates clockwise; and a first biting member which bites into the gap when the inner race rotates counterclockwise. A second bite member that bites into the gap, and the release member releases the bite of the first bite member into the gap when rotated clockwise by a motor, and the inner race watch In which the second race is rotated in the counterclockwise direction by the motor to release the bite into the gap of the second biting member to enable the inner race to rotate in the counterclockwise direction. The drive mechanism according to claim 1, wherein 3. The drive mechanism according to claim 2, wherein said first and second bite members are formed of rollers. 4. An odd number of three or more release members are provided at equal intervals around the center axis of the inner race, and the first and second bite members are arranged at positions sandwiching each release member. 3. The drive mechanism according to claim 2, wherein: 5. An elastic body which urges the first and second biting members in a direction of biting into the gap is provided between the first biting member of the biting means and the second biting member of another biting means. 5. The drive mechanism according to claim 4, wherein the drive mechanism is provided between the drive mechanisms. 6. The drive mechanism according to claim 5, wherein a space for filling a lubricant is provided in a portion where said elastic body is provided. 7. The outer race comprises an inner first ring member and an outer second ring member, wherein the first ring member is formed of metal, and the second ring member is formed of synthetic resin. 7. The driving mechanism according to claim 1, wherein 8. A gear mechanism for transmitting a driving force of said motor to rotate said release member, and said release mechanism is provided between said release member and said bite means due to backlash of said gear mechanism. 7. The drive mechanism according to claim 1, wherein a clearance larger than a rotation amount of the member is provided.