JP2942488B2 - Lift-off type motor with one-way clutch 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 motor having a lift-off type one-way clutch mechanism connected to a speed reducer incorporated in a transmission system of a mechanical device.

[0002]

2. Description of the Related Art Conventional one-way clutches are used as independent parts which are incorporated in a power transmission system of a mechanical device. FIG. 8 shows an example of use of a conventional one-way clutch, in which a belt conveyor 5 whose downstream side is inclined.
This is an example in which 0 is used. The belt conveyor 50 is used to carry an object to be conveyed upward from below. The shaft 54 of the drive pulley 51 is used to prevent the belt conveyor 50 from running backward due to its own weight.
A one-way clutch 53 is connected to one of the shaft ends.

[0003] The one-way clutch 53 is provided with a torque arm 53A, and the distal end thereof is fixed on a torque arm fixing base 55 by a fixing bracket 56 as shown in FIG. A large sprocket 57 is fixed to the other end of the shaft 54, and is connected to a small sprocket 60 fixed to an output shaft of a speed reducer 59 by a chain 58. The input shaft of the speed reducer 59 is connected to the rotation shaft of the motor of the motor 61 by a coupling 62.

[0004] When the conveyed object is carried up by the belt conveyor 50, when the motor 61 is driven, the driving torque is increased between the speed reducer 59 and the small sprocket 60 and the large sprocket 57, and the shaft 54 is driven. Is transmitted to At this time, the one-way clutch 53 idles, the drive pulley 51 rotates, and the belt conveyor 50 runs upward. On the other hand, when the motor 61 is stopped in a state in which the transported object is loaded on the belt conveyor 50, the own weight of the transported object generates a torque for rotating the driving pulley 53 in a reverse direction, but is connected to the shaft 54. Since the one-way clutch 53 prevents the reverse rotation, the belt conveyor 50 is prevented from running backward.

[0005]

In the above-described conventional one-way clutch, a cam is arranged between an outer ring and an inner ring, and when a torque in a reverse direction is applied, the cam surface of the cam is moved toward the inner ring. The friction between the peripheral surface and the outer peripheral surface of the inner ring prevents the reverse rotation.However, when the inner ring idles in the normal rotation direction with respect to the outer ring, the cam surface becomes the inner peripheral surface of the outer ring. There is a problem of frictional resistance due to sliding with respect to the surface or the outer peripheral surface of the inner ring, and when used for a high-speed rotating portion, there is a possibility that heat will be generated and seizure will occur, and power loss will occur.

[0006] Therefore, as in the case of the above-described example, the speed reducer having a low rotational speed is often used by being attached to the output shaft side, and as a result, the torque for preventing reverse rotation is increased, and the one-way clutch of the one-way clutch is increased. The size could not be reduced. Further, the conventional one-way clutch is incorporated as an independent component into the transmission system of the machine, and is provided with a torque arm for receiving torque in the reverse direction. In addition to the need for construction work for mounting on a vehicle, there is a problem that a large mounting space is required.

Therefore, the present invention solves the above-described problems in the case of using the conventional one-way clutch, and integrates a lift-off type one-way clutch mechanism into a motor connected to a speed reducer. It is an object of the present invention to provide a lift-off type motor with a one-way clutch mechanism, which can be used for high-speed rotation and can achieve downsizing and long life.

[0008]

According to the present invention, there is provided a motor with a lift-off type one-way clutch mechanism according to the present invention, wherein a rotary shaft of the standard flange motor is provided between an outer surface of a housing of a reduction gear and a front bracket of the standard flange motor. The shaft end of the reduction gear is connected to a connection hole formed at the shaft end of the input shaft of the reduction gear in a state where both are fitted coaxially so as to rotate integrally, and the bearing of the input shaft of the reduction gear is fixed. A hollow spacer, an outer ring mounted inside the spacer in a state of being prevented from rotating concentrically with the shaft end of the input shaft, and an outer peripheral surface of a shaft end of the outer ring and the input shaft. A cage ring which is concentrically arranged between the shaft and the input shaft and rotates together with the shaft end of the input shaft. Two that touch and prevent reverse rotation of the input shaft A cam having a cam surface, and an urging member for urging the cam such that the respective cam surfaces are in contact with the outer peripheral surface of the shaft end of the input shaft and the inner peripheral surface of the outer ring. The centrifugal force acting on the center of gravity when the input shaft rotates forward separates the respective cam surfaces from the inner peripheral surface of the outer race and the outer peripheral surface of the shaft end of the input shaft against the urging force of the urging member. It is set at the position where it works.

[0009]

The lift-off type motor with a one-way clutch mechanism of the present invention uses a standard flange motor as it is, and when the rotation shaft of the motor is driven, the rotation of the rotation shaft is directly applied to the input shaft of the speed reducer. Is transmitted. on the other hand,
When the torque in the reverse direction acts on the output shaft side of the speed reducer, the torque is reduced according to the speed reduction ratio of the speed reducer and transmitted to the input shaft of the speed reducer. The rotation of the input shaft of the speed reducer is prevented by a lift-off type one-way clutch mechanism formed between the outer peripheral surface and the outer ring fixed to the spacer, and reverse rotation torque acts on the rotating shaft side of the motor. do not do.

Here, the operation of the lift-off type one-way clutch mechanism formed in the present invention will be described in more detail.

First, when torque in the reverse direction acts on the input shaft of the speed reducer, the two cam surfaces of the cam are constantly pressed against the inner peripheral surface of the outer race and the outer peripheral surface of the shaft end of the input shaft by a biasing member. Therefore, the frictional force acting between the two cam surfaces and the inner peripheral surface and the outer peripheral surface respectively acts in a direction of pressing the two cam surfaces further on the inner peripheral surface of the outer race and the outer peripheral surface of the shaft end of the input shaft, The frictional force increases and the rotation of the input shaft is prevented.

On the other hand, when a torque in the forward direction acts on the input shaft of the speed reducer via the rotating shaft of the motor, the two cam surfaces and the inner peripheral surface of the outer ring and the outer peripheral surface of the shaft end of the input shaft are moved between the two cam surfaces. The respective acting frictional forces act in a direction away from the inner peripheral surface and the outer peripheral surface, as a result, opposite to the above case, and as a result, the two cam surfaces and the inner peripheral surface and the outer peripheral surface Is reduced, and the input shaft of the speed reducer starts rotating. At this time, the cage ring pivotally supporting the cam also starts rotating together with the shaft end of the input shaft. Since the centrifugal force acts on the center of gravity of the cam when the input shaft rotates, the cam swings against the mechanism urging force of the mechanism urging member, and the two cam surfaces are aligned with the inner peripheral surface of the outer ring and the axis of the input shaft. The shaft ends of the input shaft rotate without frictional resistance with respect to the outer ring, being separated from the outer peripheral surfaces of the ends. When the rotation of the input shaft stops via the rotation shaft of the motor, the centrifugal force acting on the cam also disappears. Therefore, the two cam surfaces are again brought into contact with the inner peripheral surface of the outer race and the shaft end of the input shaft by the urging force of the urging member. And when the input shaft is subjected to a reverse torque, the rotation of the input shaft can be prevented.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of a main part of a motor with a lift-off type one-way clutch mechanism showing an embodiment of the present invention. First, a space between an outer surface of a housing 31 of a speed reducer 30 and a front bracket 33 of a standard flange motor 32 is shown. The hollow spacer 3
6 are connected. The spacer 36 is connected to the speed reducer 30.
Has a function of fixing the bearing 35 of the input shaft 34 and a function as a fixing member of the outer ring 3 forming the one-way clutch mechanism.

The outer race 3 is fitted on the inner peripheral surface of the spacer 36 in a state where its rotation is restricted, and is fixed by mounting bolts.

A connection hole 38 is formed in the shaft end 37 of the input shaft 34 of the speed reducer 30, and a shaft end 39 of the rotating shaft of the standard flange motor 32 is fitted in the connection hole 38.
The rotation is stopped by the key 40. The input shaft 34
Shaft end 37 also functions as an outer peripheral surface of an inner ring whose outer peripheral surface is arranged in a normal one-way clutch.

The inner peripheral surface of the outer race 3 and the input shaft 3
4 between the outer peripheral surface of the shaft end 37 and
A cage ring 13 holding a cam and the like described later is arranged.

As shown in FIGS. 2 and 3, pins 15 are provided on both sides of the cage ring 13 so that when the input shaft 34 rotates, the cage ring 13 is connected to the input shaft. It is designed to rotate integrally with the shaft end 37 of the shaft 34. The cage ring 13 has a large number of camshafts 1
6 are provided at equal intervals in the circumferential direction, and a cam 17 is pivotally supported on each cam shaft 16 in a swingable manner. A torsion coil spring 18 as an urging member is wound around each cam shaft 16 on both sides of the cam 17, and a portion connecting both side portions of the torsion coil spring 18 is locked to the cam 17. Have been. The coil spring 1
The ends on both sides of 8 are locked by stopper shafts 19 arranged between adjacent cam shafts 16. The stopper shaft 19 also has a role of integrally connecting both side portions of the cage ring 13 formed in a ring shape by screws.

FIG. 4 shows a state in which the input shaft 34 is stopped with respect to the outer race 3. As shown in FIG. 4, each cam 17 has an inner peripheral surface of the outer race 3. The cam surface 17A is formed in contact with the cam shaft 16A.
On the side opposite to the cam surface 17A, a cam surface 17A
Is located at a position where the shaft abuts on the inner peripheral surface of the outer ring 3.
7 has an arc-shaped cam surface 17B which comes into contact with the outer peripheral surface.

The cam 17 is urged by a torsion coil spring 18 so as to swing counterclockwise around the cam shaft 16 as indicated by an arrow in FIG. 4, and in the state of FIG. The cam surfaces 17B are respectively pressed against the inner peripheral surface of the outer race 3 and the outer peripheral surface of the shaft end 37 of the input shaft 34.

Here, when power is supplied to the motor 1 with the lift-off type one-way clutch mechanism shown in FIG. 1 and the shaft end 39 of the rotating shaft is driven in the normal rotation direction, it is fixed to the shaft end 39 of the rotating shaft. The input shaft 34 of the speed reducer 30 is
Start rotation with 3. At this time, the outer ring 3 is rotated by the counterclockwise rotation of the input shaft 34 from the stop state shown in FIG.
Force acting on the cam surface 17A from the inner peripheral surface of the shaft and the input shaft 3
The frictional force acting on the cam surface 17B from the outer peripheral surface of the shaft end 37 of the No. 4 causes the cam 17 to swing clockwise against the torsion coil spring 18, so that the input shaft 34 of the speed reducer 30 rotates without hindrance. be able to.

The position of the center of gravity G of the cam 17 is
6 is located at a position deviated leftward from the center of FIG.
When the rotation speed of the input shaft 34 increases, the camshaft 16 of the centrifugal force F acting on the center of gravity G of the cam 17 as shown in FIG.
The moment around the torsion coil spring 18 is the cam 17
Is greater than the moment of urging the
The cam 17 swings clockwise in the direction of the arrow in FIG. 5 to a position where it comes into contact with the stopper shaft 19 and stops.

In the state shown in FIG. 5, the cam surface 17A of the cam 17 is separated from the inner peripheral surface of the outer ring 3, and the input shaft 34 can rotate freely with respect to the outer ring 3. When the input shaft 34 stops, the centrifugal force acting on the center of gravity G of the cam 17 also disappears, so that the cam 17 swings counterclockwise by the urging force of the torsion coil spring 18 and returns to the position shown in FIG. .

In the position shown in FIG.
In the case where a torque that causes the input shaft 34 to rotate in the clockwise direction acts on the input shaft 34, the frictional force acting on the cam surface 17A from the inner peripheral surface of the outer ring 3 and the cam surface 1 from the outer peripheral surface of the shaft end 37 of the input shaft 34
The frictional force applied to 7B generates a torque for swinging the cam 17 in the counterclockwise direction, so that the force by which the cam surface 17A presses the inner peripheral surface of the outer ring 3 increases, and the reverse rotation of the input shaft 34 of the speed reducer 30 is prevented. Is done.

On the other hand, the cam 17 receives a reaction force from the inner peripheral surface of the outer race 3, and the reaction force is transmitted from the outer peripheral surface by the cam surface 17B contacting the outer peripheral surface of the shaft end 37 of the input shaft 34. The load is not applied to the camshaft 16 because the reaction force is canceled. Also, the cam surface 17B is
The input shaft 34 is prevented from rotating with respect to the cam 17 and the cage ring 13 due to the frictional force acting between the two surfaces.

The cams used in the above-described embodiments differ in the shape of the two cam surfaces in order to deviate the position of the center of gravity from the center of the cam shaft to the inner ring side.
Each cam surface may be formed in a point-symmetrical contour with respect to the cam axis, and the position of the center of gravity may be adjusted by providing holes or concave portions or adding weights to the cam.

Although the torsion coil spring is used as the biasing member, other types of biasing members may be used. For example, a compression coil spring or the like may be interposed between the cam and the cage ring. You may.

[0027]

As described above, according to the motor with the lift-off type one-way clutch mechanism of the present invention, the torque arm is mounted on the fixed base with the torque arm on the output shaft side of the speed reducer connected to the rotating shaft of the motor as in the conventional art. There is no need to secure a large mounting space as in the case of using a large one-way clutch connected, and no work is required for mounting the one-way clutch.

According to the motor with a lift-off type one-way clutch mechanism of the present invention, the outer peripheral surface of the input shaft of the speed reducer also serves as the inner ring function of the one-way clutch mechanism. Since the spacer connecting the motor is shared as a fixing member for fixing the bearing of the input shaft in the speed reducer and a fixing member for fixing the outer ring forming the one-way clutch mechanism, the number of parts is small. In addition to the use of a standard flange motor, the production becomes easy.

Also, the lift-off type one-way clutch mechanism incorporated in the motor with the lift-off type one-way clutch mechanism of the present invention receives reverse rotation torque on the input shaft side of the speed reducer. It can be incorporated in the spacer, can be formed small, and can cope with a large reverse torque applied to the output shaft side of the speed reducer.

According to the lift-off type one-way clutch mechanism formed in the present invention, when the input shaft rotates with respect to the outer ring, the cam surface is separated from the inner peripheral surface of the outer ring by the centrifugal force acting on the cam. The cam surface and the inner peripheral surface of the outer ring are in sliding contact only at the start and stop of the rotation of the input shaft.Therefore, the abrasion of the sliding contact portion is reduced, and the life can be greatly extended. Since there is no heat generation, seizure does not occur on the cam surface or the inner peripheral surface of the outer ring, and it can be used for high-speed rotation.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a motor with a lift-off type one-way clutch mechanism showing one embodiment of the present invention.

FIG. 2 is a view showing an arrangement of cams in a lift-off type one-way clutch according to an embodiment of the present invention.

FIG. 3 is a sectional view of an arrangement state of the cam shown in FIG. 2;

FIG. 4 is a diagram illustrating a posture of a cam when the input shaft is stopped and when a reverse rotation torque is applied.

FIG. 5 is a diagram illustrating a posture of a cam when the input shaft is freely rotated.

FIG. 6 is a diagram showing an example of a conventional one-way clutch.

FIG. 7 is a diagram showing a structure for fixing a torque arm in a conventional one-way clutch.

[Explanation of symbols]

Reference Signs List 1 standard flange motor 3 outer ring 13 cage ring 17 cam 17A, 17B cam surface 18 torsion coil spring (biasing member) 30 reducer 31 housing 32 standard flange motor 33 front bracket 34 input shaft of reducer 30 35 bearing 36 spacer ( Fixing member) 37 Input shaft 3
4 Shaft end (inner ring) 38 Connecting hole 39 Shaft end of motor rotating shaft

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F16D 41/07

Claims (1)

(57) [Claims] 1. A connection hole formed between an outer surface of a housing of a reduction gear and a front bracket of a standard flange motor, wherein a shaft end of a rotation shaft of the standard flange motor is formed at a shaft end of an input shaft of the reduction gear. And a hollow spacer for fixing the bearing of the input shaft of the speed reducer while being connected so as to rotate coaxially and integrally, and concentric with the shaft end of the input shaft inside the spacer. An outer ring mounted in a state where rotation is prevented in a shape, a cage ring which is concentrically disposed between the outer ring and an outer peripheral surface of a shaft end of the input shaft and rotates together with the shaft end of the input shaft , The cage ring is pivotably supported by the cage ring, and the shaft end of the input shaft is
A cam having two cam surfaces that abut against the outer peripheral surface of the input shaft and the inner peripheral surface of the outer ring to prevent reverse rotation of the input shaft ; and the respective cam surfaces are formed on the outer peripheral surface of the shaft end of the input shaft and the inner peripheral surface of the outer ring. A biasing member for biasing the cam so that the cam comes into contact with each other, wherein the centrifugal force acting on the center of gravity when the input shaft rotates forward with respect to the center of gravity of the cam opposes the biasing force of the biasing member. lift off type one-way clutch mechanism with a motor, characterized in that it is set in a position to act to space the cam surface from the outer circumferential surface of the shaft end of the input shaft and the inner peripheral surface of the outer ring.