JP2002213486A - Rotational driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact and light-weight rotational driving device. SOLUTION: A housing C has a clutch chamber 12 for housing a clutch part A, a speed reducing mechanism part chamber 13 for housing a speed reducing mechanism part B, and an installing part 14 arranged on one end side of the speed-reducing mechanism part chamber 13. An electric motor D as a rotational driving source is installed in the installing part 14 of the housing C by a bolt, and the output shaft is connected to a worm shaft 9 of the speed-reducing mechanism part B. Thus, the clutch part A, the speed-reducing mechanism part B, and the motor D are unitized via the housing C, so that the compact and light-weight rotational driving device can be provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary drive device in which a clutch and a mechanical deceleration mechanism, and a motor are compactly unitized. For example, an electric slide door of an automobile, an electric curtain, an electric fire shutter, an electric motor, etc. It can be used for auxiliary wheelchairs, electric auxiliary carts, etc.

[0002]

2. Description of the Related Art In general, in a device for controlling the operation of a load by transmitting / cutting off input torque from a rotary drive source by a clutch, the torque of the rotary drive source is reduced by a speed reducer and input to the clutch. Thereby, the number of rotations and the torque at the load-side mechanism are adjusted to desired values. for that reason,
The rotation drive unit needs to include three elements, a rotation drive source, a clutch, and a reduction gear, and tends to be larger as a whole.

In a rotary drive device used for an electric fire protection shutter, for example, when a rotary drive source is stopped, a reverse input torque from a load-side mechanism is cut off to open a load-side mechanism (such as a shutter opening / closing mechanism). A function that enables manual operation may be required.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a rotary drive device in which a clutch, a speed reduction mechanism, and a motor are unitized compactly.

Another object of the present invention is to provide a rotary drive device having a function of cutting off reverse input torque from the output side when the rotary drive source is stopped.

[0006]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a clutch unit having an input side member and an output side member for transmitting / cutting torque between both members, and a rotary drive source. A mechanical deceleration mechanism for decelerating the input torque of the clutch portion and inputting the input torque to the input side member of the clutch portion, a housing accommodating the clutch portion and the deceleration mechanism portion therein, and a rotary drive source mounted on the mounting portion of the housing And a motor provided as a motor. According to this configuration, since the clutch unit, the speed reduction mechanism unit, and the motor are unitized via the housing, a compact and lightweight rotary drive device can be provided.

Further, in order to solve the above-mentioned problems, the present invention provides an input side member and an output side member, a clutch section for transmitting and disconnecting torque between both members, and an input torque from a rotary drive source. A mechanical deceleration mechanism for decelerating and inputting to the input side member of the clutch part, a housing having a mounting part for housing the clutch part and the deceleration mechanism part therein and mounting a rotary drive source on a part thereof; Is provided. According to this configuration, it is possible to provide a compact and lightweight rotary drive unit in which the clutch unit and the speed reduction mechanism unit are housed in the housing to form a unit. In addition, by directly connecting the rotation drive source to the mounting portion of the housing, the rotation drive source is configured by a clutch unit, a speed reduction mechanism unit, and the like.
A compact and lightweight rotary drive device can be obtained.

[0008] Here, the "rotational drive source" includes a device for generating a rotational force by power such as electricity, hydraulic pressure, or air pressure, as well as a mechanism for manually generating a rotational force. The “motor” includes a hydraulic motor, an air motor, and the like in addition to the electric motor. Further, the “mechanical speed reduction mechanism” includes a gear mechanism, a worm & wheel mechanism, a planetary roller mechanism, a cone / disk mechanism, and the like.

In the above construction, the clutch portion is interposed between the input side member and the output side member, and holds the torque transmitting member capable of engaging and disengaging with both members in the forward and reverse rotation directions, and the torque transmitting member. A retainer for controlling engagement and disengagement of the torque transmitting member through relative rotation with respect to the input side member; an elastic member for connecting the input side member and the retainer in a rotational direction; and a housing or a stationary side fixed thereto. And a viscous fluid interposed between the input member and the input member in both forward and reverse directions are transmitted to the output member, and the reverse input torque in the forward and reverse directions from the output member is transmitted to the input member. It can be configured to shut off between them.

Here, the "input-side member" is a member that rotates by receiving an input torque from a rotary drive source via a speed reduction mechanism. The input side member has a clutch surface on which the torque transmitting member engages and disengages, and includes a clutch surface directly provided on the shaft member, a ring member having the clutch surface fixed to the shaft member, and the like. It is.

The "output-side member" is a member that rotates integrally with the input-side member and idles with respect to the input-side member through the engagement and disengagement of the torque transmitting member. The output side member has a clutch surface that engages and disengages with the torque transmitting member, and includes a clutch surface directly provided on the shaft member, a ring member having a clutch surface fixed to the shaft member, and the like. It is.

The "torque transmitting member" includes a roller-shaped member, a ball-shaped member, a sprag-shaped member, and the like.

The "viscous fluid" is generated when the retainer rotates relative to the housing or a stationary member fixed thereto.
By applying viscous resistance (rotational resistance) to the retainer, relative rotation (rotation delay of the retainer) is caused between the retainer and the input side member. Here, the viscous resistance (rotational resistance) is obtained due to the viscous shear resistance and stirring resistance of the viscous fluid.
The viscous fluid is not particularly limited as long as such a function can be obtained. For example, a highly viscous fluid such as silicone oil or grease can be used.

In the above configuration, when the input member rotates upon receiving the input torque, the retainer connected to the input member via the elastic member rotates. At this time, the cage receives viscous resistance from the viscous fluid interposed between the housing and the stationary member. Therefore, the elastic member bends in the rotation direction, and a relative rotation (rotation delay of the retainer) occurs between the retainer and the input-side member. And, by the relative rotation of the cage,
The torque transmitting member held thereby receives a force from the retainer and engages with the input / output side member. Thereby, the torque from the input side member is transmitted to the output side member via the torque transmission member, and the output side member rotates integrally with the input side member.

When the rotation drive source stops and the rotation of the input member and the holder stops, the viscous fluid loses its viscous resistance, so that the holder rotates relative to the input member due to the elastic restoring force of the elastic member. (Relative rotation is performed in the opposite direction to the above.), And both circumferential positions are centered. Then, by the centering of the retainer, the torque transmitting member held by the retainer receives a force from the retainer and separates from the input / output side member. Thereby, the output-side member is released from the input system, and the output-side member can idle with respect to the input-side member.

[0016]

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

1 to 3 show a rotary driving device according to an embodiment of the present invention. Clutch section A and reduction mechanism section B
Are housed inside the housing C and are compactly unitized.

The clutch portion A includes a clutch outer ring 1 as an input member, a clutch inner ring 2 as an output member, a plurality of rollers 3 as a torque transmitting member, a retainer 4, a centering spring 5 as an elastic member, and a stationary member. A fixing ring 6 as a member and a viscous fluid 7 such as silicone oil or grease interposed between the fixing ring 6 and the retainer 4 are provided.

A plurality of cam surfaces 1a are formed on the inner periphery of the clutch outer ring 1 at predetermined intervals in the circumferential direction. As shown in FIG. 4 in an enlarged manner, the cam surface 1a is deep at the center in the circumferential direction, and is gradually shallower toward both sides in the circumferential direction. As shown in FIG. 2, a plurality of protrusions 1b are formed on the outer periphery of the clutch outer ring 1 at predetermined circumferential intervals to engage with notches 8a of a worm wheel 8 of a reduction mechanism B described later in the rotational direction. A notch 1c is formed at one end of the clutch outer ring 1 to which an engagement portion 5b of a centering spring 5 described later is mounted.

On the outer periphery of the clutch inner race 2, a circumferential surface 2a facing the cam surface 1a of the clutch outer race 1 is formed. The first inner peripheral portion 2b of the clutch inner race 2 is rotatably inserted outside the outer periphery of a boss portion 10 provided integrally (or separately) with the housing C. The second inner peripheral portion 2c of the clutch inner race 2 is press-fitted to the outer periphery of the shoulder 11a of the output shaft 11 rotatably inserted into the inner periphery of the boss portion 10, and is fixed in the axial direction by the retaining ring 15. You. Thereby, the clutch inner ring 2 is connected to the output shaft 11.
Fixed in the axial and rotational directions. Incidentally, the clutch inner ring 2 and the output shaft 11 may be connected to each other by a multi-face width, a spline or serration, a key or the like. Here, the multi-plane width generally means that one or a plurality of flat portions are provided on both the inner circumference of the hole and the outer circumference of the shaft body inserted therein, and the rotation direction is determined by fitting the two flat portions together. Refers to the structure for fixing.

The retainer 4 has a plurality of pockets 4a (see FIG. 4) for accommodating the rollers 3 at predetermined circumferential intervals.
A flange 4b is formed at one end of the retainer 4 and extends continuously to the outer diameter side, and a through hole 4c at the other end of the retainer 4 is provided with an engagement portion 5b of the centering spring 5. Is formed.

A hollow fixing ring 6 is mounted on the inner side wall of the housing C, and is fixed by a pin 6a. The flange 4b of the retainer 4 is inserted into a space 6b formed inside the fixed ring 6 with a radial gap and an axial gap, and the viscous fluid 7 is sealed in these gaps. In this embodiment, the facing dimension between the flange portion 4b and the fixing ring 6 is relatively large in the radial direction and relatively small in the axial direction, so that the axial size of the clutch portion A is reduced. I have.

As shown in FIG. 2, the centering spring 5
Has an annular portion 5a and a pair of engaging portions 5b bent from both ends of the annular portion 5b toward the inner diameter side. The annular portion 5a
It is mounted on the outer periphery of one end side of the clutch outer ring 1 and has an engagement portion 5b.
Are fitted in the notch 1c of the clutch outer race 1 and the through hole 4c of the retainer 4. Thereby, the clutch outer ring 1
And the retainer 4 are connected via a centering spring 5 in the rotational direction.

In this embodiment, as the speed reduction mechanism B,
A worm & wheel mechanism including a worm wheel 8 and a worm shaft 9 is employed. The worm wheel 8 is fitted around the outer periphery of the clutch outer ring 1. The relative rotation of the notch 8a formed on the inner periphery of the worm wheel 8 and the projection 1b formed on the outer periphery of the clutch outer ring 1 is prevented by engagement in the rotational direction. Alternatively, the worm wheel 8 may be formed integrally with the outer periphery of the clutch outer ring 1.

The housing C includes a clutch section A, in this embodiment, a clutch chamber 12 for accommodating the clutch section A and a worm wheel 8 on the outer periphery thereof, and a reduction mechanism section B, in this embodiment, a reduction mechanism for accommodating the worm shaft 9. Club room 13
And a boss 10 on which the output shaft 11 is rotatably mounted, and a mounting portion 14 provided on one end side of the speed reduction mechanism chamber 13 for mounting a rotation drive source.

As shown in FIG. 3, a rotary drive source, for example, an electric motor D is mounted on the mounting portion 14 of the housing C with bolts or the like, and its output shaft is connected to the worm shaft 9 of the speed reduction mechanism B. Thereby, the clutch part A, the speed reduction mechanism part B, and the motor D are unitized via the housing C, and a compact and lightweight rotary drive device is obtained.

In the state shown in FIG.
Of the clutch outer ring 1 and the circumferential side wall of the through hole 4c of the retainer 4 with elastic force respectively, whereby the clutch outer ring 1 and the retainer 4 rotate in the rotational direction. , And the cage 4 is positioned (centered) in the circumferential direction with respect to the clutch outer ring 1.

FIG. 4 shows the periphery of the roller 3 in an enlarged manner. A symmetrical wedge gap is formed between the cam surface 1a of the clutch outer ring 1 and the circumferential surface 2a of the clutch inner ring 2 in both forward and reverse rotation directions. Each roller 3 has a cam surface 1
a and the circumferential surface 2a,
a.

FIG. 4A shows a state in which the retainer 4 is centered by the centering spring 5, and in this state, the circumferential center of the pocket 4a of the retainer 4 and the circumferential direction of the cam surface 1a are shown. The center coincides. Therefore, the roller 3 is located substantially at the center of the cam surface 1a and separates from the wedge gaps in both the forward and reverse rotation directions. The diameter of the roller 3 is set to be slightly smaller than the radial distance between the cam surface 1a and the circumferential surface 2a.
a and a slight gap in the radial direction. Hereinafter, this state is referred to as a neutral position.

The input torque from the motor D is applied to the speed reduction mechanism B
Is decelerated at a predetermined reduction ratio by the speed reduction mechanism section B, and is input to the clutch outer wheel 1 of the clutch section A. When the clutch outer ring 1 rotates, the retainer 4 rotates by receiving a rotational torque from the clutch outer ring 1 via the centering spring 5. At this time, the retainer 4 is a viscous fluid interposed between the retainer 4 and the fixed ring 6. 7 (viscous shear resistance, stirring resistance, etc.). Therefore, the engaging portion 5b of the centering spring 5 bends, and a relative rotation (a rotation delay of the retainer 4) occurs between the retainer 4 and the clutch outer ring 1 accordingly.
The viscous resistance of the viscous fluid 7 is proportional to the number of rotations of the retainer 4. If the spring torque of the centering spring 5 is K1 and the viscous resistance is K2, the number of rotations exceeds the set number of rotations (the number of rotations at which the roller meshes). <K2.

When relative rotation occurs between the retainer 4 and the clutch outer ring 1, as shown in FIG. 4 (b), the roller 3 housed in the pocket 4a of the retainer 4 is moved by the retainer 4.
It is pushed in the direction opposite to the rotation direction of the clutch outer ring 1 (the direction of the arrow in the figure) (the rotation delay direction of the retainer 4) and engages with the wedge gap in that direction. At this time, since the clutch outer ring 1 is rotating in the direction of the arrow, the roller 3 is engaged between the cam surface 1a and the circumferential surface 2a by the principle of wedge. As a result, torque is transmitted from the clutch outer ring 1 to the clutch inner ring 2 via the roller 3, and the clutch outer ring 1, the cage 4,
And the clutch inner ring 2 rotates integrally. And
By the rotation of the clutch inner ring 2, the output shaft 11 rotates at a predetermined speed.

When the motor D stops and the rotation of the speed reduction mechanism B, the clutch outer ring 1 and the retainer 4 stops, the viscous fluid 7
, The retainer 4 is relatively rotated with respect to the clutch outer ring 1 by the elastic restoring force of the centering spring 5, and is centered at the neutral position shown in FIG.

When the retainer 4 is centered with respect to the clutch outer ring 1 in this manner, the roller 3 separates from the wedge gap and returns to the neutral position, so that the clutch inner ring 2 becomes normal with respect to the clutch outer ring 1. It becomes idle in both reverse rotation directions and is released from the input system. Therefore, in this state, the output shaft 11 can be manually rotated in both the forward and reverse directions. Accordingly, even when the motor D is stopped, the load-side mechanism connected to the output shaft 11 can be manually operated. Further, since the reverse input torque from the output shaft 11 is interrupted by the clutch portion A and does not return to the input system, damage to the speed reduction mechanism portion B and the motor D can be prevented.

[0034]

The present invention has the following effects.

(1) Since the clutch unit, the reduction mechanism unit, and the motor are unitized via the housing, a compact and lightweight rotary drive device can be provided.

(2) The torque transmission direction (forward rotation / reverse rotation) is automatically switched according to the change in the rotation direction of the rotary drive source.
In addition, when the rotary drive source is stopped, the output side member is automatically released from the input system to enable manual operation from the output side, so that the electric fire shutter, electric slide door, electric curtain, electric assist wheelchair, electric When applied to an auxiliary trolley or the like, the convenience of these devices can be further improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a rotary drive device according to an embodiment.

FIG. 2 is a sectional view taken along the line AA in FIG.

FIG. 3 is a longitudinal sectional view showing a state where a motor is attached to a housing.

FIG. 4 is an enlarged sectional view showing a peripheral portion of a roller.

[Explanation of symbols]

 A Clutch part 1 Clutch outer ring 2 Clutch inner ring 3 Roller 4 Cage 5 Centering spring 6 Fixing ring 7 Viscous fluid B Reduction mechanism C Housing D Motor

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Masahiro Kurita 3066 Oumida, Ogata, Kuwana-shi, Mie F-term within NTN Corporation (reference) 3J009 DA17 EA05 EA19 EA23 EA32 EB24 EC06 FA04 3J056 AA63 BA01 BA05 BE06 CA14 CD01 GA04 GA12

Claims (3)

[Claims] 1. A clutch unit comprising an input-side member and an output-side member, and transmitting / cutting torque between the two members;
A mechanical deceleration mechanism for decelerating an input torque from a rotary drive source and inputting the input torque to an input side member of the clutch unit, a housing accommodating the clutch unit and the deceleration mechanism unit, and mounting the housing And a motor as the rotation drive source attached to the unit. 2. A clutch part comprising an input side member and an output side member, for transmitting and disconnecting torque between the two members,
A mechanical deceleration mechanism for decelerating an input torque from a rotary drive source and inputting the input torque to the input side member of the clutch part, and the clutch part and the deceleration mechanism part are housed therein, and the rotation A housing having a mounting portion for mounting a drive source. 3. The torque transmission member further interposed between the input-side member and the output-side member and capable of engaging and disengaging the two members in both forward and reverse rotation directions. A retainer for holding a transmission member and controlling engagement and disengagement of the torque transmission member through relative rotation with respect to the input side member, an elastic member for connecting the input side member and the retainer in a rotational direction, and the housing Or a viscous fluid interposed between the stationary member and a stationary member fixed to the member. The input torque in both the forward and reverse directions from the input member is transmitted to the output member. 3. The rotary drive device according to claim 1, wherein the reverse input torque in both directions is interrupted between the input side member and the reverse input torque.