JP3391845B2 - Reducer with transmission - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission, and more particularly, to a reduction gear with a transmission that utilizes a planetary mechanism.

[0002]

2. Description of the Related Art A speed change device is characterized in that an internal gear in a constituent member of a planetary mechanism is fixed or is connected to a carrier for supporting the planetary gear to rotate integrally with the carrier. Kai 62-2
No. 24584. If you fix the internal gear in this thing, it will decelerate as a normal planetary mechanism, but when you connect the internal gear to the carrier, it means that the sun gear and the carrier are directly connected, so it is possible not to decelerate. It has features.

By the way, in the above, the internal gear itself is slid in the axial direction and meshed with the fixed gear to fix the internal gear, and the internal gear is also slid to mesh with the carrier. We are connecting with. In this method of slidingly moving the internal gear, there is a method in which a fulcrum is conventionally provided in a part of the gear case, and an arc-shaped lever arranged on the outer periphery of the gear case is supported at the fulcrum to perform a swing operation. In order to swing it, it is necessary to provide a sufficient gap between the lever and the gear case so as not to collide with the gear case, and it is difficult to compact the device and the diameter of the device becomes large. In addition, since it is separated from the gear shift handle for operating the lever (that is, the lever swings and the gear shift handle slides), the number of parts increases, and the lever must be incorporated as a fulcrum. There was a drawback that the disadvantages in terms of cost could not be eliminated.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and the purpose thereof is to save space, be compact, and be easy to assemble. An object of the present invention is to provide a reduction gear transmission with a transmission that has a small number of parts, can be manufactured at a low cost, and can perform a reliable gear shift.

[0005]

In order to solve the problems of the above-mentioned conventional examples and to achieve the object of the present invention, the speed reducer with a transmission of the present invention is a rotatable internal gear in a planetary mechanism or this A member radially coupled to the internal gear is arranged in the gear case so as to be movable in the axial direction,
The gear case and the carrier or the sun gear are provided with engaging teeth for engaging the internal gear or a member radially coupled to the internal gear, and the internal gear or a member coupled to the internal gear is moved to move the internal gear. or fixed to the gear case, with the transmission which is to perform the shift by switching or integrated into the carrier or the sun gear
In the speed reducer , an external handle that is axially movable with respect to the gear case is attached to the outer shell of the speed reducer with a transmission.
Freely slideable along the guides of the constituent housings
A lever made of wire and having elasticity in the moving direction of the internal gear is attached to the handle, and the distal end of the lever is provided in the gear case through a long hole in the moving direction of the internal gear or a member connected thereto. Engage in the annular groove provided on the outer peripheral surface and click on the handle.
Provided with a click arm having a lick protrusion and has elasticity
The lever that has a protrusion that presses the click protrusion from the inside
The click protrusion elastically locks to the housing guide
It is characterized in that it is formed by forming free protrusions or recesses .

Here, it is also preferable that the handle is held on the outer peripheral surface of the gear case and is slidable by being guided by a housing forming an outer shell.
Yes.

[0007]

According to the present invention having the above-described structure, the handle for external operation which is movable in the axial direction with respect to the gear case is provided, and the lever made of a wire rod and elastic in the moving direction of the internal gear is used as the handle. The lever and the lever are engaged with an annular groove provided on the outer peripheral surface of the internal gear or a member connected to the internal gear through a long hole provided in the gear case and long in the moving direction. In both cases, the structure can be simplified as movement in the axial direction. Also, the handle has a click protrusion.
A lick arm is provided, and clicks on the elastic lever
A protrusion that presses the rise from the inside is provided to guide the housing.
The click projection has a protrusion or recess that can be elastically locked.
By clicking the slide movement of the handle
Can be exposed, and the lever is springy
Can be attached to the handle and the configuration is simplified.
As a result, the ease of assembly is improved.

The handle is held on the outer peripheral surface of the gear case and slidably guided by the housing forming the outer shell, so that the device is simple and compact, and the assembling is easy. It will be a good device.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the accompanying drawings. The illustrated example is incorporated in the speed reducer 3 in the power system assembly of the electric drill driver. As shown in FIG.
It is composed of a gear case 6, a clutch handle 78 for adjusting tightening torque, and a chuck 8. In the gear case 6, a speed reducing unit 3 having a gear shifting function and a torque adjusting clutch unit 4 having a locking means are arranged.

Based on FIG. 1 and FIG. 2, these speed reducers 3
The clutch unit 4 will be described. First, gear case 6
Is formed of a cylindrical case 61, a case 62 connected to the front end of the case 61 by a mounting screw 64, and a motor mounting base 60 mounted to the rear end of the case 61. Further, the case 61 is provided with a pair of long holes 63 extending in the axial direction, the case 62 is provided with a plurality of holes 67 penetrating in the axial direction, and has a non-circular cross-sectional shape from the front end. The base 66 is integrally projected.

The speed reduction unit 3 installed in the case 61 of the gear case 6 is composed of a two-stage planetary mechanism, and the first-stage planetary mechanism is the output shaft 20 of the motor 2.
A sun gear 31 fixed to the inner surface of the case 61, an internal gear 33 fixed to the inner surface of the case 61, a plurality of planet gears 32 meshing with the both, and a carrier 34 having a shaft for supporting each planet gear 32. The planetary mechanism of the stage is composed of a sun gear 35 integrally formed on the carrier 34, an internal gear 37, a plurality of planetary gears 36, and a carrier 38 supporting each planetary gear 36.

Here, the internal gear 33 is fixed to the case 61 as described above, whereas the internal gear 37 is slidable in its axial direction and rotatable about its axis, and has an outer periphery. An annular groove 52 is formed in the center portion of the surface, and a plurality of engaging teeth 51 are provided at equal intervals in the circumferential direction on one end side of the outer peripheral surface. As shown in FIG. 3, the outer peripheral surface of the internal gear 37 is received by a plurality of roller pins 71 arranged at intervals on the inner peripheral surface of the case 61.

The axial movement of the internal gear 37 is caused by the annular groove 52 formed on the outer peripheral surface of the internal gear 37.
The lever 55 is engaged with both ends of the lever 55, and the lever 55 is attached to a handle 58 slidably attached to the housing 100. That is, the handle 58 corresponds to FIG.
As shown in 0, it is slidably mounted along the guide 100a of the housing 100, the click arms 58b having the click protrusions 58a are provided on both sides of the handle 58, and the lower surface of the handle 58 is also provided. The handle 58 is provided with a recess 58c, and the lower surface of the handle 58 is provided with locking portions 58d and 58e at both ends in the sliding direction of the recess 58c. The click protrusions 58a are provided on both sides of the recess 58c. positioned. On the other hand, the lever 55 is made of a wire rod and has elasticity, and the main body 55b is formed by folding back the wire rod so that the two wire rod portions are substantially parallel to each other. 2 in the substantially middle portion of the main body portion 55b composed of parts
The projections 55c are bent from the wire portions of the strips to the sides, and the folded base portions of the main body portion 55b are bent to both sides to provide locked portions 55d. Legs 55e extend in a substantially L-shape from the tips of the two parallel wire rod portions that form the portion 55b, and the continuous base of the leg 55e serves as the locked portion 55f. Then, as shown in FIG. 10B, the main body portion 5 of the lever 55 is
5b is located in the recess 58c on the lower surface of the handle 58,
The locking portions 58d and 58e are locked to the locked portions 55d and 55f, and further, the projection 55c is fitted into the fitting recess 58f at the back of the click projection 58a. In this way lever 5
The main body portion 55b of No. 5 is attached to the lower surface portion of the handle 58, and by sliding the handle 58 along the guide 100a, the lever 55 also moves in the same direction as the handle 58. Here, on both side surfaces of the guide 100a of the housing 100, protrusions or recesses (not shown) in which the click protrusions 58a can be elastically locked are formed.
The projection 55c is set so as to be fitted into the fitting recess 58f on the back of the click projection 58a and press the click projection 58a from the inside.
8a is provided with clickability by the elastic force of the lever 55 made of an elastic wire material. In addition, as described above, the protrusion 55c is fitted into the fitting recess 58f at the back of the click protrusion 58a and is elastically contacted with the main body 55.
b does not come off from the recess 58c. The tips of the substantially L-shaped legs 55e on both sides of the lever 55 are case 6
It is engaged with the annular groove 52 of the internal gear 37 through the elongated holes 63 formed in 1.

On the other hand, an engaging projection 54 is provided on the outer peripheral surface of the carrier 34 in the first stage planetary mechanism, and a plurality of engaging projections 53 is provided on the inner peripheral surface of the case 61. These engaging projections 54 and 53 are engaged with the teeth on the inner peripheral surface of the internal gear 37 and the engaging teeth 51 when the internal gear 37 slides in the axial direction, and the lever 55.
When the internal gear 37 is moved forward by engaging the engaging teeth 51 with the engaging protrusions 53 provided on the case 61, as shown in FIGS. 5 and 6, the internal gear 37 is moved forward. Is prevented from rotating. Conversely, when the lever 55 is moved backward, the internal gear 37 is moved backward, and when the internal gear 37 is engaged with the engagement protrusion 54 of the carrier 34, as shown in FIGS. And carrier 34
The sun gear 35, which is integrally provided on the.
In any case, the engagement between the internal gear 37 and the planetary gear 36 is maintained.

In the former case, deceleration is effectively performed even in the second-stage planetary mechanism, so that a large reduction ratio is achieved, and in the latter case, the planetary gear 36 rotates (rotates) about its axis. Since the sun gear 35 and the carrier 38 are directly connected to each other without being formed, only the deceleration of the first stage planetary mechanism is effective, and thus the reduction ratio becomes small.

Further, the internal gear 37 always rotates when it is connected to the carrier 34, but as described above, the outer peripheral surface is received by the roller pin 71, so that the friction load is not increased so much and the noise is reduced. ing. Further, the movement of the lever 55 for moving the internal gear 37 is transmitted to the internal gear 37 via the spring property of the lever 55 itself. That is, the internal gear 37 moves by being pushed by elasticity, and the engaging teeth 51 and the engaging protrusions 5 of the internal gear 37 are moved.
It is possible to reduce the number of 3 and make the engagement between the internal gear 37 and the engagement projection 53 smooth and reliable.

Next, the clutch portion 4 for torque adjustment will be described. The clutch unit 4 uses a planetary mechanism similarly to the deceleration unit 3, and also has a lock unit for preventing the output shaft 7 from rotating in both directions in addition to the torque adjusting unit. The planetary mechanism disposed in 62 includes a sun gear 40 integrally formed with the carrier 38, an internal gear 42, a plurality of planetary gears 41 meshing with the two, a carrier 43 supporting each planetary gear 41. It is composed of.

The locking means is the internal gear 4
A plurality of cam projections 47 projecting at equal intervals in the circumferential direction on the inner peripheral portion of the front end of 2, and a pair of lock pins 45a, 45 mounted rotatably on the inner surface of the case 62.
b, a central portion is supported by the case 62, and a spring 46 for bringing both ends into contact with the lock pins 45a, 45b, and a lock ring 44 coupled to the carrier 43 so as to rotate integrally with the output shaft 7. Has been done.

The lock pins 45a and 45b are engaged with the teeth on the outer peripheral surface of the lock ring 44 so as to form a ratchet with their tips facing each other, and one lock pin 45a
Reference character a prevents rotation of the lock ring 44, that is, the output shaft 7 in one direction, and lock pin 45b prevents rotation of the output shaft 7 in the other direction. When both the lock pins 45a and 45b are both engaged with the lock ring 44, the output shaft 7 to which the chuck 8 is fixed by the mounting screw 80 at the tip end is in the state of being locked in both directions of rotation. Is.

The torque adjusting means includes a plurality of locking projections 48 projecting at equal intervals in the circumferential direction on the outer peripheral portion of the front end of the internal gear 42, and the holes 67 formed in the case 62. The steel balls 74 provided, the thrust plate 75 that covers the deformed base portion 66 of the case 62, the clutch spring 76, the clutch plate 77, and the clutch handle 78.
It is composed of.

The clutch handle 78 is adapted to be freely rotatable within a predetermined angle between the tip end surface of the gear case 6 and a mounting plate 79 mounted on the gear case 6 with a mounting screw 81. Clutch plate 7 on the inner surface
When the clutch handle 78 is rotated, the clutch plate 77, which is prevented from rotating due to the fitting with the deformed base portion 66 of the case 62, moves in the axial direction. Has been The clutch spring 76 is a compression coil spring arranged between the clutch plate 77 and the thrust plate 75, and contacts the steel ball 74 via the thrust plate 75. The steel ball 74 engages with the locking projection 48 formed on the internal gear 42.

The operation of the locking means and the torque adjusting means in the clutch section 4 will be described. In the stopped state where the motor 2 is not rotated, the pair of lock pins 4
5a and 45b are both engaged with the lock ring 44,
As described above, the output shaft 7 is in a locked state with respect to its bidirectional rotation. Therefore, the tightening work can be performed manually. Now, if the motor 2 is rotated from this state to rotate the output shaft 7 in one direction,
Since the output shaft 7 is locked, this driving force is transmitted to the internal gear 42 via the planetary gear 41, as a result of which the internal gear 42 rotates in the opposite direction, and the locking projection 48 is caused by the clutch spring 76. When the rotation of the steel ball 74 is stopped by coming into contact with the steel ball 74 which is being biased, the cam projection 47 of the internal gear 42 pushes one of the pair of lock pins 45a and 45b in accordance with the rotation direction. Is released from the lock ring 44, and the restriction on the rotation of the output shaft 7 in one direction is released.
Since the other lock pin does not prevent the output shaft 7 from rotating in this direction, the output shaft 7 starts to rotate by the power from the motor 2.

Thereafter, this state is maintained in the locking means, but when the tightening torque reaches a predetermined value, the internal gear 42 which receives the reaction force thereof,
Start spinning. That is, the locking projection 48 gets over the spring-loaded steel ball 74 and starts rotating. As a result, the torque transmitted to the output shaft 7 is limited at that time, and the output shaft 7 stops.

The interference between the lock pin 45a and the cam projection 47 when the internal gear 42 starts to rotate for torque adjustment causes an abutting portion of the cam projection 47 on the lock pins 45a and 45b to be an arc surface (see FIG. (Not shown), the cam protrusion 47 is from which direction the lock pin 45
The lock pins 45a and 45b are pushed up against the spring 46 to prevent the contact with the a and 45b. In FIG. 2, 70 and 72 are washers, and 73 is the output shaft 7.
And the sun gear 40 (carrier 38) is a pin whose both ends are inserted.

In the above embodiment, the internal gear 37 of the second stage planetary mechanism is set to be freely movable in the axial direction and rotatable, and the sun gear 35 is connected to the sun gear 35 in order to connect it. By using the carrier 34 of the planetary mechanism of the first stage, which is integrally provided, the miniaturization is achieved by rationalizing the arrangement of parts. However, the internal gear 37 is not the sun gear 35 but the second stage. It may be connected to the carrier 38 of the planetary gear mechanism. In this case, the engagement protrusion 53 is preferably provided integrally with the internal gear 33. Further, the internal gear 33 of the first stage planetary mechanism may be movable and rotatable in the axial direction.

FIG. 11 shows an electric drill driver provided with the above power system assembly. In the figure, 9 is a battery pack, 10 is a main body, 11 is a handle, and 12 is a switch handle. The handle 58 for shifting is the main body 10
Is disposed on the upper surface of. In the above embodiment, the rotatable internal gear 37 in the planetary mechanism is arranged in the gear case 6 so as to be movable in the axial direction,
The gear case 6 and the carrier 34 are provided with engaging teeth for engaging with the internal gear 37.
The embodiment has been described in which the gears are moved to switch the internal gear 37 to the gear case 6 or to be integrated with the carrier 34 to change the speed. However, the rotatable internal gear in the planetary mechanism is described. A member radially coupled to 37 is disposed in the gear case 6 so as to be movable in the axial direction, and the member radially coupled to the internal gear 37 is moved to fix the internal gear 37 to the gear case 6 or the carrier 34. It is also possible to change the speed by changing whether the gear case 6 is integrated with the sun gear. In this case, an annular groove 52 is provided on the outer peripheral surface of the member radially coupled to the internal gear 37, and the gear case 6 is provided.
A handle 5 for external operation that is attached to the shaft so that it can move axially
Internal gear 37 made of wire attached to 8
The end of the lever 55 having elasticity in the moving direction is engaged with the annular groove 52 provided on the outer peripheral surface of the member radially coupled to the internal gear 37 through the long hole 63 provided in the gear case and long in the moving direction. Is also good.

[0027]

According to the present invention, as described above, the handle for external operation, which is axially movable with respect to the gear case, is used as the housing shell which constitutes the outer shell of the speed reducer with a transmission.
The lever is slidably mounted along the guide, and a lever made of a wire material and elastic in the moving direction of the internal gear is attached to the handle, and the tip of the lever is provided in the gear case through a long hole extending in the moving direction to the internal gear or It is engaged with an annular groove formed on the outer peripheral surface of the member connected to this, and the handle has a click protrusion.
Click protrusion on the elastic lever
Is provided with a protrusion that presses the
Click protrusions form protrusions or recesses that can be elastically locked
Since then are the handle, a mobile with axial lever, as compared with the conventional example so as to convert the axial movement of the handle to swing the lever, a small load on the internal gear, and easily In addition, it is possible to provide a transmission that can be reliably and reliably switched, is compact in the radial direction, is inexpensive, and has a good assembling property.
In addition, the spring force of the lever with spring property is used to
If you can add clickability to the lick arm
Use the spring property to attach the MINI lever to the handle.
The structure is simplified and the assemblability is good.
It is something .

According to the second aspect of the present invention, the handle is held on the outer peripheral surface of the gear case and is slidable by being guided by the housing forming the outer shell. Becomes

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the above.

3 is a cross-sectional view taken along line XX of FIG.

4 is a cross-sectional view taken along the line YY of FIG.

FIG. 5 is a vertical cross-sectional view when the internal gear is fixed.

FIG. 6 is a transverse cross-sectional view when the internal gear is fixed.

FIG. 7 is a vertical sectional view when an internal gear is connected to a carrier (sun gear).

FIG. 8 is a transverse cross-sectional view when an internal gear is connected to a carrier (sun gear).

FIG. 9 is a cross-sectional view showing a mounting portion of a handle.

10A and 10B are views showing attachment of a handle and a lever, FIG. 10A is an exploded perspective view, and FIG. 10B is a bottom view.

FIG. 11 is a perspective view of an electric power tool including the above power system assembly.

[Explanation of symbols]

6 gear case 34 career 37 Internal Gear 52 annular groove 55 lever 58 handle 63 long hole

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Bibliography Actual Kaihei 4-60680 (JP, U) Japanese Patent Publication 4-59112 (JP, B2) (58) Fields investigated (Int.Cl. ⁷ , DB name) B25B 21/00 F16H 3/00

Claims (2)

(57) [Claims] 1. A rotatable internal gear of a planetary mechanism or a member radially coupled to this internal gear is axially movably disposed in a gear case, and is radially coupled to the internal gear or this internal gear. The gear case and the carrier or the sun gear are provided with engaging teeth for engaging with the member, and the internal gear or a member coupled thereto is moved to fix the internal gear to the gear case, or the carrier or the sun gear. by switching or be integrated into the shift that was to carry out the gear shift
In the reduction gear with gear, attach the handle for external operation that is movable in the axial direction with respect to the gear case to the outside of the reduction gear with gear.
Sliding movement along the guide of the housing that constitutes the shell
A lever that is freely attached and that is made of wire and has elasticity in the moving direction of the internal gear is attached to the handle, and the tip of the lever is provided in the gear case through an elongated hole that is long in the moving direction and the internal gear or a member connected thereto. It engaged in an annular groove provided on the outer peripheral surface of the handle
A click arm with a click protrusion is installed on the
The lever that has a protrusion that presses the click protrusion from the inside
And the click protrusion is elastically engaged with the guide of the housing.
A reduction gear with a transmission, characterized in that a stopable projection or recess is formed . 2. The speed reducer with a transmission according to claim 1, wherein the handle is held on the outer peripheral surface of the gear case, and is slidable by being guided by a housing forming an outer shell.