JPH0740257A - Electric rotary tool - Google Patents

Abstract

(57) [Abstract] [Purpose] This is an electric rotary tool that can be used as a hand-tightening driver even when the output shaft is free. Provide an electric rotating tool. In an electric rotary tool having a planetary gear reduction mechanism, a planetary holding plate 5d having a spherical projection 5f and a clutch plate 6 having a radially extending ridge 6e and a sun gear formed on an opposite shaft are formed. A planetary mechanism which constitutes a clutch mechanism for transmitting a rotational force, is arranged so as to rotate an internal gear 8 having a projection 8b within a certain range, and is fixed with a lock plate 9 having concave and convex teeth 9a for locking. A pair of ratchet pawls, in which a holding plate 7d is connected to the output shaft 10, the projections 8b are arranged between the ratchet case 11 from the left and right, meshes with the locking concave and convex teeth 9a from the left and right, and is pressed by a spring from the rear side. An electric rotating tool characterized in that 12 is attached.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric rotary tool for transmitting a rotational torque of a motor to an output shaft via a planetary gear reduction mechanism, and more specifically, an output shaft even when the switch of the motor is turned off. The present invention relates to an electric rotating tool that allows a driver mounted on a vehicle to be manually rotated in forward and reverse directions.

[0002]

2. Description of the Related Art An electric rotary tool transmits a rotational torque from a drive shaft of a motor through a planetary gear speed reduction (speed change) mechanism to an output shaft on which a driver is mounted by turning a switch provided on a grip portion on and off. Although it is a tool, when the power is turned off, the rotation of the output shaft becomes free. Therefore, an electric rotary tool equipped with a mechanism capable of being manually tightened so that a driver mounted on the output shaft can check the tightness even when the power is off has been developed. For example, JP-A-58-21727
As disclosed in No. 4, "A transmission driver for transmitting power to the output shaft of the forward / reverse rotation motor to the output shaft via a planetary gear reduction mechanism, wherein the internal gear of the planetary gear reduction mechanism is A ratchet gear is connected to the output shaft at a position facing the internal gear on the side surface side so as to be rotatable within a predetermined range, and a pair of ratchets meshing with the ratchet gear in the forward and reverse directions, respectively. An electric driver characterized in that an internal release member is provided for urging the pawls to engage with each other and operating the release of the respective engagements in correspondence with each ratchet pawl within the rotation range of the internal gear. "It has been known. Also, the output shaft is designed to change the drive torque by tightening a screw, but most of the mechanisms are clutches in which a clutch plate having an uneven surface between the drive shaft and the output shaft is in contact with a ball. Set up a mechanism,
A biasing force is applied by a spring from one side, and the biasing force of the spring is changed and adjusted.

[0003]

In the above electric rotary tool, even when the power is turned off and the output shaft is in the free state, the ratchet pawl on one side is automatically locked and the retightening can be performed by rotating the driver. However, since the internal gear is provided with a notch on a part of its side surface and the notch surface of the notch is used as the release cam surface, the machining of the notch becomes relatively complicated, and a part of the outer peripheral surface of the internal gear is provided. Is provided with a projection so that it can be fitted in a recess provided in the inner peripheral surface of the gear case, and the shaft of the ratchet pawl proximal end must be fitted in the side surface of the internal gear and the member on the opposite side. However, there is a problem that the assembling work is difficult. Also, when a clutch mechanism for an electric rotary tool is provided, a gear case with holes drilled at several places around the circumference is provided to dispose clutch gears and balls separately around the planetary reduction mechanism between the motor and the output shaft. -The structure is complicated because a washer for pressing the ball and the ball must be arranged.

The present invention has been made in view of the above problems, and an object thereof is an electric rotating tool that can be used as a hand-tightening driver even when the power is off and the output shaft is free. Thus, a clutch mechanism is formed in the middle of the planetary speed reduction mechanism to provide a compact electric rotary tool as a whole.

[0005]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides an internal gear which constitutes a planetary speed reduction mechanism in a gear case so as to be rotatable and slidable in the front-rear direction. Forming internal teeth on the inner surface of the planetary gear holding plate of the planetary gear that meshes with the internal gear and the gear case, the internal teeth connecting to the engaging teeth provided on the outer peripheral surface of the internal gear; A planetary gear reduction mechanism having a planetary gear speed reduction mechanism in which a transmission mechanism is configured to be moved forward and backward by a lever arranged outside the planetary gear reduction mechanism, in which a spherical projection is formed on a surface perpendicular to the axial direction. Of the planetary support plate and a clutch plate having a radial projection on the surface facing the spherical projection and a sun gear formed on the shaft on the opposite side constitute a clutch mechanism for transmitting rotational force, and a shaft on the outer peripheral side surface. Inside the projection formed in the direction A gear is arranged in a gear case so as to rotate within a certain range, and a planetary gear that meshes with the internal gear and the sun gear formed on the clutch plate is axially supported, and a locking concave-convex tooth is formed on the outer periphery. A planetary holding plate, which is an integral and fixed plate, is connected to the output shaft, and the projections of the internal gear are arranged from the left and right on the ratchet case arranged on the gear case, and the locking irregularities of the lock plate are arranged. It is characterized in that at least a pair of ratchet pawls are attached so that the teeth are engaged with each other from the left and right and a spring is pressed from the back so that the biasing force always acts.

[0006]

The operation when the electric rotating tool is used as the above means will be described with reference to the reference numerals in the accompanying drawings (FIGS. 1 to 4). When the power of the motor 2 is off and neither the drive shaft 2a nor the output shaft 10 is rotating, the pair of ratchet pawls 12 and 13 both mesh with the locking concave and convex teeth 9a of the lock plate 9 from the left and right in either direction. It does not rotate (FIG. 4 (A). When the motor switch is turned ON and the motor is rotated in the normal direction (counterclockwise), the sun gear 7a rotates in the normal direction and the internal gear 8 rotates in the reverse direction (clockwise). At this time, the planetary gear 7b rotates clockwise and the planet holding plate 7d tries to rotate counterclockwise, and the planetary holding plate 7d is provided with a pair of ratchet pawls 12 and 13 for locking concave and convex teeth. In principle, it does not rotate because it is fixed integrally with the lock plate 9 engaged with 9a, but when the internal gear 8 rotates in the clockwise direction, a protrusion (claw) provided on the outer peripheral side surface of the internal gear 8 8b is a pair of ratchet claws Chino ratchet pawl in the clockwise direction of side 1
3 is kicked and disengaged from the engagement of the locking concave and convex teeth 9a of the lock plate 9. Therefore, the planet holding plate 7d can rotate in the counterclockwise direction, and the output shaft 10 also rotates in the positive direction (FIG. 4 (B). When the motor 2 is rotated in the reverse direction (clockwise), the third stage). When the sun gear 7a of the eye rotates in the reverse direction (rotates in the clockwise direction) and the internal gear 8 rotates in the counterclockwise direction, the projections (claws) 8b provided on the outer peripheral side surface of the internal gear 8 form a pair of ratchet pawls. The ratchet pawl 12 on the counterclockwise side of the above is disengaged from the engagement of the locking concave and convex teeth 9a of the lock plate 9, so that the planet holding plate 7d can rotate clockwise, and the output shaft 10 is also reversed. Rotate (Fig. 4
(C). Next, turn on the switch of the motor 2 to switch the motor.
When the electric rotary tool is manually rotated with the switch of the motor 2 turned off when the switch is turned off with the ratchet pawl 14 kicking the projection 8b by rotating the motor 2 in the reverse direction, the output shaft 10 is rotated, for example, in the reverse direction. (Clockwise rotation)
Then, since a reaction force acts counterclockwise on the output shaft 10, counterclockwise rotation torque acts on the output shaft 10 itself. Since the planet holding plate 7d directly connected to the output shaft 10 also tries to rotate clockwise, the planet gear 7b revolves around the sun gear 7a and the internal gear 8 also rotates a little clockwise. Of the pair of ratchet pawls, one ratchet pawl 12 is pushed by the spring 14 and meshes with the locking concave and convex teeth 9a of the lock plate 9, so that it cannot rotate in any direction. Therefore, since the output shaft 10 cannot rotate counterclockwise, it can be manually rotated. Similarly, when the output shaft 10 is rotated in the forward direction, it can be manually turned.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical sectional view of an electric rotary tool of the present invention, and FIG. 2 is a configuration perspective view. In this electric rotary tool, the speed is reduced in three steps between the motor 2 and the output shaft 10, but the speed can be changed by the slide internal gear 4.

The sun gear 3a, which is fitted to the drive shaft 2a of the motor 2 and constitutes the first stage reduction mechanism, meshes with the internal gear 3c formed inside the gear case 1A and is on the opposite side. And the planetary gear 3b axially supported by the planetary holding plate 3d forming the sun gear 5a of the second speed reduction mechanism. A gear 3e that meshes with the internal teeth 4c of the slide internal gear 4 is formed on the outer periphery of the planet holding plate 3d.

The second stage sun gear 5a meshes with a planet gear 5b axially supported by a planet holding plate 5d having a spherical projection 5f formed on a surface 5p perpendicular to the axial direction. Also meshes with the internal teeth 4c of the slide internal gear 4. The gear case 1B connected to the gear case 1A has internal teeth 5 that mesh with the external teeth 4b of the slide internal gear 4.
c is formed. That is, the concave groove 4a of the slide internal gear 4
When the slide internal gear 4 is slid to the position shown in FIG. 1 by the slide lever 25 engaged with the internal gear 4c and the external gear 3e of the planet gear 5b and the planet holding plate 3d is meshed, The gear 4, the first stage planetary holding plate 3d, the second stage planetary gear 5b, and the second stage planetary holding plate 5d rotate integrally. Then, the rotation and rotation of the second-stage planetary gear 5b is stopped, and the second-stage planetary holding plate 5d does not operate as a part of the speed reduction mechanism, but remains in the second-stage sun gear 5b.
The rotational torque of a is directly transmitted to the next stage reduction mechanism. In addition, the slide internal gear 4 by the slide lever 25.
When the outer teeth 4b of the above are slid to a position where they mesh with the inner teeth 5c of the gear case 1B, the sliding internal gear 4 is fixed to the gear case 1B. The internal teeth 4c of the slide internal gear 4 mesh with the second-stage planetary gear 5b, and the second-stage sun gear 5a and the second-stage planetary holding plate 5d operate as a part of a reduction mechanism. By sliding the slide internal gear 4 in this manner, the gear reduction mechanism of the electric rotary tool can be used as a transmission mechanism.

Next, the spherical projections 5f formed on the surface 5p perpendicular to the axial direction of the planet holding plate 5d have several ridges 6e formed radially on the surface perpendicular to the axial direction. Is disposed in contact with the flat surface 6p of the clutch plate 6 provided with. FIG. 3 (A) is a perspective view of the planet holding plate 5d,
FIG. 3B is a perspective view of the clutch plate 6d. Further, a plate 20 and a thrust bearing 21 are arranged on the surface of the clutch plate 6 opposite to the flat surface 6p, and a ball 22 is provided.
And a push rod 23 is arranged at several positions around the circumference of the gear case 1C so as to penetrate therethrough. Then, the urging force of the spring 24 pressed by the clutch handle 30 and the adjuster ring 31 described later via the push rod 23 acts on the clutch plate 6. Thus, when the torque reaction force acting on the output shaft 10 becomes equal to or larger than the set driving torque value, the spherical protrusion 5f
Passes over the ridge 6e of the clutch plate 6 and the output shaft 10 idles.

The drive torque of the output shaft 10 is adjusted by adjusting the pressing force of the push rod 23, which is performed by the adjuster ring 31. That is, the adjuster ring 31 has a step-like inclined surface 31a formed on the outer peripheral side surface and a partially flat surface provided on the outer peripheral side surface. The flat surface is provided with the protrusion 30a provided on the inner peripheral side surface of the clutch handle 30. Abutted. Then, by rotating the clutch handle 30, the protrusion 30
a changes the pushing force on the flat surface, axially moves the entire adjuster ring 31 to change the biasing force of the spring 24 via the push rod 23, and the spherical projection 5f formed on the surface 5p of the planet holding plate 5d causes the clutch to move. The magnitude of the rotational torque when riding over the ridge 6e of the plate 6 is changed.

Next, FIG. 4 (A) is a sectional view taken along the line X--X in FIG. 1. A third stage sun gear 7a is formed on the shaft portion of the clutch plate 6 to form a third stage planet. Internal teeth of an internal gear 8 arranged so as to be meshed with a third-stage planetary gear 7b pivotally supported by a holding plate 7d and to be rotated in a certain range by a gear case 1C. Mesh with 7c. That is, in the internal gear 8, the concave portions 1Ca provided at equal intervals around the circumference of the gear case 1C are fitted with the convex portions 8a formed at equal intervals around the outer circumference of the cylindrical portion of the internal gear 8C in the circumferential direction. It is designed to be able to rotate within a certain range. A taper-shaped projection (claw) 8b is formed on the outer peripheral side surface of the internal gear 8 in the axial direction. The planet holding plate 7d is fixed to a shaft 7e which pivotally supports the third stage planetary gear 7b, and a lock plate 9 having locking concave and convex teeth 9a formed on the outer periphery thereof. is there.

Further, the gear case 1B and the gear case 1
A ratchet mounting case 11 is arranged between C and C, and at least a pair of ratchet pawls 12 and 13 locate the projection (claw) 8b of the internal gear 8 therebetween from the left and right, and the lock plate 9 It is mounted so as to mesh with the locking concave and convex teeth 9a from the left and right. The ratchet pawls 12 and 13 are pressed from behind by springs 14 and 14 so that the biasing force is always applied.

The details of the electric rotary tool of the present invention are as described above. Next, the operation thereof will be described. Motor 2
When the switch is turned off and neither the drive shaft 2a nor the output shaft 10 is rotated, the pair of ratchet pawls 12 and 13 mesh with the locking concave and convex teeth 9a of the lock plate 9 from the left and right, and do not rotate in any direction ( FIG. 4 (A).

First, the motor switch is turned on and the motor is turned on.
When the rotor is normally rotated (counterclockwise), the third stage sun gear 7a rotates normally (counterclockwise) and the internal gear 8 rotates counterclockwise (clockwise). At this time, the planet gear 7b rotates clockwise and the planet holding plate 7d tries to rotate counterclockwise. Since the planetary plate 7d is integrally fixed with the lock plate 9 in which the pair of ratchet pawls 12 and 13 are engaged with the locking concave and convex teeth 9a, the planetary plate 7d does not rotate in principle. However, when the internal gear 8 rotates in the clockwise direction, the projection (claw) 8b provided on the outer peripheral side surface of the internal gear 8 resists the biasing force of the spring 14 and the clockwise side of the pair of ratchet pawls. The ratchet pawl 13 is kicked to be disengaged from the engagement of the locking concave and convex teeth 9a of the lock plate 9. Therefore, the planet holding plate 7d can rotate counterclockwise, and the output shaft 10 also rotates forward (see FIG. 4).
(B).

When the motor 2 is rotated in the reverse direction (clockwise), the third stage sun gear 7a also rotates in the reverse direction (clockwise) and the internal gear 8 rotates in the counterclockwise direction. When this is done, the projection (claw) 8b provided on the outer peripheral side surface of the internal gear 8 is
The ratchet pawl 12 on the counterclockwise side of the pair of ratchet pawls is kicked against the biasing force of No. 4 to disengage from the engagement of the locking concave and convex teeth 9a of the lock plate 9, and thus the planet holding plate 7
d can be rotated clockwise, and the output shaft 10
Also reverses (FIG. 4 (C)).

Next, the switch of the motor 2 is turned on to turn on the motor.
A description will be given of a case where the electric rotary tool is manually turned by turning off the switch of the motor 2 when the ratchet pawl 14 kicks the projection 8b and the switch is turned off by rotating the motor in the reverse direction. For example, when the output shaft 10 is rotated in the reverse direction (clockwise rotation) by hand rotation, a counterclockwise reaction force acts on the output shaft 10, so that a counterclockwise rotation torque acts on the output shaft 10 itself. The planetary holding plate 7d directly connected to the output shaft 10 also tries to rotate clockwise, so that the planetary gear 7b revolves around the sun gear 7a and the internal gear 8 also rotates slightly clockwise. Of the pair of ratchet pawls, one ratchet pawl 12 is pushed by the spring 14 and meshes with the locking concave and convex teeth 9a of the lock plate 9, so that it cannot rotate in any direction. Therefore, since the output shaft 10 cannot rotate counterclockwise, it can be manually rotated. Even when the output shaft 10 is normally rotated (counterclockwise rotation) by hand rotation, the other ratchet pawl 12 is in a state of meshing with the locking concave and convex teeth 9a of the lock plate 9, and the output shaft 10 is in any direction. Also, it can not be rotated and can be turned by hand as well.

[0018]

Since the electric rotary tool of the present invention has the structure described in detail above, it is extremely easy to change the high and low speeds and the tightening torque, and the power source is turned on so that the normal driver can operate normally and reversely. In addition to being used by rotating, it can be used as a hand-held driver with the power turned off. Further, since the electric rotating tool of the present invention is provided with a clutch mechanism in a part of the planetary speed reducing mechanism, the electric rotating tool has a simple structure as a whole, is easy to assemble, and can be easily inspected.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an electric rotary tool of the present invention.

FIG. 2 is a configuration perspective view of the electric rotating tool of the present invention.

FIG. 3 (A) is a perspective view of a planetary support plate that constitutes the electric rotary tool of the present invention, and FIG. 3 (B) is a perspective view of a clutch plate that constitutes the electric rotary tool of the present invention. .

FIG. 4 is a cross-sectional view taken along the line XX of FIG. 1, in which a pair of ratchet pawls are in mesh with the locking concave and convex teeth of the lock plate from the left and right, and are not rotated in either direction. 4C is a diagram showing a state in which the power of the motor is turned on and the switch is turned on, and the motor is normally rotated (counterclockwise) to rotate the output shaft normally, FIG. 4] is a diagram showing a state in which the motor is rotated in the reverse direction (clockwise) and the output shaft is rotated in the reverse direction.

[Explanation of symbols]

1 1A, 1B, 1C Gear case 2 Motor 2a Drive shaft 3a, 5a, 7a Sun gear 3b, 5b, 7b Planetary gear 3d, 5d, 7d Planet holding plate 4 Slide internal gear 4b External tooth 3c, 4c, 5c, 7c Inner teeth 5f Spherical protrusion 6 Clutch plate 6e Convex portion 8 Internal tooth gear 8b Protrusion (claw) 9 Lock plate 9a Rough tooth 10 Output shaft 11 Ratchet mounting case 12, 13 Ratchet pawl 14 Spring 22 Ball 23 push rod 24 spring 30 clutch handle 31 adjuster ring

Claims (1)

[Claims] 1. A planetary gear holding plate and a gear case of a planetary gear, wherein an internal gear constituting a planetary speed reduction mechanism is rotatably arranged in a gear case and slidable in the front-rear direction, and meshes with the internal gear. An internal tooth which is connected to an engaging tooth provided on the outer peripheral surface of the internal gear, is formed on the internal surface of the gear, and the internal gear is moved forward and backward by a lever arranged outside the gear case. In the electric rotating tool having a planetary gear speed reduction mechanism configured as described above, a planetary holding plate of the planetary speed reduction mechanism having a spherical projection formed on a surface perpendicular to the axial direction and a radially convex shape on a surface facing the spherical projection. A clutch mechanism for transmitting rotational force is formed by a clutch plate that is formed and has a sun gear formed on the shaft on the opposite side, and an internal gear with a protrusion formed in the axial direction on the outer peripheral side surface
A planetary gear that meshes with the internal gear and the sun gear formed on the clutch plate is axially supported, and a lock plate formed with concave and convex teeth for locking is fixed on the outer periphery. The planetary support plate integrated with the output shaft, and the ratchet case arranged in the gear case, the protrusions of the internal gear are arranged from the left and right, and the concave and convex teeth for locking of the lock plate are arranged from the left and right. An electric rotating tool comprising: at least a pair of ratchet pawls that are engaged with each other and are pressed by a spring from behind so that an urging force is constantly applied.