CN211315061U - Reduction gear oil supply structure of electric tool and electric tool - Google Patents

Abstract

The utility model provides a can restrain and produce lubricated bad electric tool's reduction gear fuel feeding structure and have the electric tool of this structure between the gear. A groove (14a) is provided on the lower surface of the motor bracket (14), a felt member (16) capable of being impregnated with lubricating oil is disposed in the groove (14a), the opening of the groove (14a) is covered with a gasket (15), a through hole (15a) communicating with the inside of the groove (14a) is provided in the gasket (15), and the lubricating oil is supplied to the meshing section (C) of the gear via the through hole (15 a). Thus, poor lubrication between gears can be suppressed.

Description

Reduction gear oil supply structure of electric tool and electric tool

Technical Field

The utility model relates to an electric tool's reduction gear oil feeding structure and electric tool.

Background

In an electric power tool, a reduction gear train is generally provided between a motor and a tool bit (e.g., a grindstone), and lubricating oil is contained in the reduction gear train, so that gears can be lubricated well, and the service life of the reduction gear train is prolonged. In some cases, the electric power tool may be kept in a specific posture for a long period of time during machining work, and in this case, in the speed reduction mechanism, a part of the gear meshing portions may be continuously drained with the lubricating oil for a long period of time, thereby causing poor lubrication. This is particularly true in multi-stage reduction gear trains.

SUMMERY OF THE UTILITY MODEL

In view of the above, an object of the present invention is to provide a reduction gear oil supply structure of an electric tool capable of suppressing occurrence of poor lubrication between gears, and an electric tool having the same.

In order to achieve the above object, the utility model provides an electric tool's reduction gear oil feeding structure, electric tool has: the lubricating oil supply mechanism is provided with a lubricating oil holding space, and a lubricating oil impregnated member is accommodated in the lubricating oil holding space.

With the above configuration, the lubricating oil supply mechanism is provided in the vicinity of the reduction gear train, and the lubricating oil is slowly released without being rapidly lost due to the change in the operation posture by the slow release action of the lubricating oil-impregnated member on the lubricating oil, so that the oil supply and lubrication to the reduction gear train can be maintained for a long time, and poor lubrication between gears can be suppressed, and wear of the gears can be suppressed.

The utility model discloses preferably, lubricating oil keeps somewhere the space and has the orientation the wall portion of reduction gear train is equipped with the oil feed hole that link up on this wall portion. With the above configuration, the lubricating oil retention space is disposed to have a wall portion facing the reduction gear train, and the wall portion is provided with the oil supply hole, so that the structure can be made compact.

Preferably, the lubricating oil supply mechanism is disposed on one side of the reduction gear train, which is away from the main shaft, in the axial direction of the main shaft.

In the electric power tool, since the work is often performed in a posture in which the spindle is disposed in the vertical direction in the axial direction of the spindle and the spindle is located downward, the lubricating oil supply mechanism is disposed on the side (upper side) of the reduction gear train remote from the spindle, and the oil can be efficiently supplied to the reduction gear train.

The utility model discloses preferably, lubricating oil feed mechanism includes partition part and cover part, the partition part sets up the motor with between the reduction gear train the face of partition part is towards be equipped with the recess on the surface of reduction gear train, the opening of recess by the cover part covers and constitutes lubricating oil keeps somewhere the space, the cover part constitutes the wall portion, the oil feed hole is seted up on the cover part.

The utility model discloses preferably, the output shaft of motor is installed with the mode that can rotate on the partition part, the recess be with the axis of rotation of output shaft is the annular at center, the cover part is annular gasket.

The utility model discloses preferably, reduction gear is planetary reduction gear train, has: a 1 st sun gear coaxially fixed to the output shaft; a plurality of 1 st planetary gears arranged on the outer periphery of the 1 st sun gear and meshed with the sun gear; and a 1 st ring gear disposed on and meshed with outer peripheries of the 1 st planetary gears, wherein the oil supply hole is disposed at a position substantially overlapping a meshed portion of the 1 st planetary gear and the 1 st ring gear when viewed in a direction of an axis of the output shaft.

With the above configuration, since the oil supply hole is disposed at a position substantially overlapping the meshing portion, oil can be effectively supplied to the meshing portion, and poor lubrication can be avoided.

The utility model discloses preferably, along the direction of axis is seen, the recess configuration is in the skew the position of meshing portion, the oil feed hole have some be located with the position of recess coincidence, some be located with the position of meshing portion coincidence in addition.

With the above configuration, since the oil supply hole is partially located at a position overlapping the recessed groove and partially located at a position overlapping the meshing portion, the lubricating oil can be guided from the recessed groove (lubricating oil retention space) to the meshing portion.

The utility model discloses preferably, the reduction gear train still has: a 1 st planetary carrier that rotatably holds a plurality of the 1 st planetary gears; a 2 nd sun gear that rotates integrally with the 1 st carrier; a plurality of 2 nd planetary gears arranged on the outer periphery of the 2 nd sun gear and meshed therewith; a 2 nd internal gear disposed on and meshed with outer peripheries of the 2 nd planetary gears; and a 2 nd carrier that rotatably holds the plurality of 2 nd planetary gears, wherein the main shaft is connected to the 2 nd carrier so as to rotate integrally therewith, and wherein the output shaft, the 1 st sun gear, the 1 st carrier, the 2 nd sun gear, the 2 nd carrier, and the main shaft are coaxially arranged so as to share the axis.

With the above configuration, the reduction gear train is a two-stage planetary gear train, and therefore, in a posture in which the axis is arranged in the vertical direction, poor lubrication is particularly likely to occur in the planetary gear train of the previous stage, and the present invention can suppress poor lubrication in the planetary gear train of the previous stage.

Preferably, the outer periphery of the 1 st planet carrier is provided with outer teeth, the 2 nd inner gear can move between the 1 st position and the 2 nd position along the direction of the axis, and in the 1 st position, the 2 nd inner gear is simultaneously meshed with the outer teeth of the 1 st planet carrier and the 2 nd planet gear and can rotate integrally with the 1 st planet carrier; in the 2 nd position, the 2 nd internal gear is disengaged from the external teeth of the 1 st carrier and is fixed from rotation.

By adopting the structure, the planetary gear train can have two-stage speed reduction.

Preferably, the partition member is a motor bracket supporting the motor.

The utility model discloses it is preferred, lubricating oil soaks the part and is made by the asphalt felt material.

In addition, in order to achieve the above object, the electric tool of the present invention has the reduction gear oil supply structure according to any one of the above aspects.

Drawings

Fig. 1 is a perspective view of a grinding and polishing machine (grinding wheel mounted state) according to an embodiment;

FIG. 2 is a side sectional view of the grinder/polisher;

FIG. 3 is an enlarged view of a portion of FIG. 2;

FIG. 4 is a side cross-sectional view of the grinder/polisher in the spindle lock mode;

FIG. 5 is a side sectional view of the polishing machine (polishing pad mounted state);

FIG. 6 is an enlarged view of a portion of FIG. 5;

FIG. 7 is a perspective view of a lubricant supply mechanism of the polishing machine;

FIG. 8 is an exploded view of the lubricating oil supply mechanism;

fig. 9 is a partially enlarged view of fig. 3.

Description of the reference numerals

100, grinding and polishing; 1 a main body shell; 2a main handle; 3 a battery mounting portion; 4, a battery; 5 an auxiliary handle; 6A grinding wheel; 6B polishing pad; 7a lubricating oil supply mechanism; 10 a motor; 11 a reduction gear train; 12a locking button; 13 an operating handle; 14 motor bracket (partition member); 14a groove; 15a gasket (covering member, wall portion); 15a through hole (oil supply hole); 16 felt members (lubricating oil impregnated members); a 17A bearing; 17B bearings; a 17C bearing; 21 a trigger switch; 101 an output shaft; 110 protrusions; 111, sun gear 1; 112, 1 st planet wheel; 112a pin shaft; 113 the 1 st annulus gear; 114, the 1 st planet carrier; 115 nd sun gear; 116, the 2 nd planet; 116a pin shaft; 117 the 2 nd internal gear; 118 the 2 nd planet carrier; 119a main shaft; 119a locking hole; 121 an operation part; 122 a locking pin; 123 a return spring; 131 a switch lever; a C engaging portion; s space (lubricant oil retention space); the X axis.

Detailed Description

The following describes in detail embodiments of the present invention with reference to the drawings.

Fig. 1 is a perspective view of a grinding and polishing machine (grinding wheel mounted state) according to the present embodiment; FIG. 2 is a side sectional view of the grinder/polisher; FIG. 3 is an enlarged view of a portion of FIG. 2; FIG. 4 is a side cross-sectional view of the grinder/polisher in the spindle lock mode; FIG. 5 is a side sectional view of the polishing machine (polishing pad mounted state); FIG. 6 is an enlarged view of a portion of FIG. 5; FIG. 7 is a perspective view of a lubricant supply mechanism of the polishing machine; FIG. 8 is an exploded view of the lubricating oil supply mechanism; fig. 9 is a partially enlarged view of fig. 3.

In the description of the present embodiment, for convenience of description, the vertical direction (see the reference symbols in the corresponding drawings) is defined in a state where the grinder/polisher 100 operates, however, this does not constitute a limitation of the present invention.

< overview of the overall Structure >

As shown in fig. 1, a polishing machine 100 as an example of an electric power tool includes a main body case 1; a main handle 2, one end of which is connected with the main body case 1 and the other end of which is provided with a battery mounting part 3; a battery 4 mounted on the battery mounting portion 3; and an auxiliary handle 5 connected to the main body case 1 at a certain angle (about 90 degrees) to the main handle 2.

Referring to fig. 2, the motor 10, the reduction gear train 11, and the spindle 119 are provided inside the main body case 1, and the grinding wheel 6A for polishing exposed to the outside of the main body case 1 is attached to the spindle 119. Further, as shown in fig. 5, the grindstone 6A can be detached from the spindle 119, and a polishing pad 6B for polishing can be attached. Emery wheel 6A corresponds to the tool head in the utility model with polishing pad 6B.

As shown in fig. 1, 2, and 5, a trigger switch 21 is provided in a portion of the main handle 2 close to the main body case 1. When the operator pulls the trigger switch 21, the electric power of the battery 4 is supplied to the motor 10 to drive the motor 10 to rotate, the rotation of the motor 10 is reduced by the reduction gear train 11 and transmitted to the spindle 119, and the spindle 119 rotates to rotate the grinding wheel 6A or the polishing pad 6B mounted thereon, so that the corresponding grinding or polishing work can be performed.

< reduction Gear train >

Next, a specific structure of the reduction gear train 11 will be explained.

As shown in fig. 2 to 6, in the present embodiment, the reduction gear train 11 is a planetary reduction gear train and has two stages of planetary trains, i.e., an upper planetary train having the 1 st sun gear 111, the 1 st planetary gear 112, the 1 st ring gear 113, and the 1 st carrier 114, and a lower planetary train having the 2 nd sun gear 115, the 2 nd planetary gear 116, the 2 nd ring gear 117, and the 2 nd carrier 118.

Of these, in the upper planetary gear train, the 1 st sun gear 111 is coaxially fixed to the output shaft 101 of the motor 10, and rotates integrally with the output shaft 101; each 1 st planetary gear 112 is meshed with the 1 st sun gear 111 and the 1 st internal gear 113 at the same time, and is fixed on the planet carrier 114 in a rotatable manner through a pin shaft 112 a; the 1 st internal gear 113 is fixed to the main body case 1.

Further, a motor bracket 14 is fixed in the main body case 1, and the motor 10 is supported from below by the motor bracket 14. The 1 st sun gear 111 is rotatably fixed to the motor bracket 14 by a bearing 17A. Since the 1 st sun gear 111 is fixed integrally with the output shaft 101 of the motor 10, the output shaft 101 can be said to be rotatably attached to the motor bracket 14. In the present embodiment, the motor bracket 14 also constitutes an upper wall of the reduction gear train 11. The motor bracket 14 corresponds to a "partition member" in the present invention.

In the lower planetary gear train, the 2 nd sun gear 115 is integrally formed with the 1 st carrier 114 and rotates coaxially therewith; the 2 nd planetary gears 116 are simultaneously meshed with the 2 nd sun gear 115 and the 2 nd internal gear 117, and are rotatably held on the 2 nd planetary carrier 118 by the pin shafts 116a, respectively; the 2 nd internal gear 117 is disposed coaxially with the 1 st carrier 114; the 2 nd carrier 118 is coaxially fixed to the main shaft 119.

In the present embodiment, the 2 nd internal gear 117 is held in the main body case 1 so as to be movable up and down, has two vertical movement positions, and corresponds to the high speed mode and the low speed mode of the reduction gear train 11, respectively. Specifically, when the 2 nd internal gear 117 moves to the upper position, and simultaneously meshes with the external teeth of the 1 st carrier 114 and the 2 nd planetary gear 116, the 1 st carrier 114 rotates integrally therewith, and the reduction gear train 11 is in the high speed mode; when the 2 nd internal gear 117 moves to the lower position, it meshes only with the 2 nd planetary gear 116, and by engaging with a projection 110 (fig. 3) fixedly provided on the main body casing 1, the rotation of the 2 nd internal gear 117 is inhibited, and the reduction gear train 11 is in the low speed mode.

In order to switch the position of the 2 nd internal gear 117 (or switch the high-low speed mode of the reduction gear train 11), an operating handle 13 is provided on the main body case 1, a switching lever 131 is connected in the operating handle 13, and the switching lever 131 is connected with the 2 nd internal gear 117, so that an operator can switch the high-low speed mode of the reduction gear train 11 by toggling the operating handle 13 up and down to switch the up-down moving position of the 2 nd internal gear 117.

As shown in fig. 2, 4, and 5, upper and lower ends of the main shaft 119 are rotatably supported by the main body case 1 via bearings 17B and 17C, respectively.

In the present embodiment, the output shaft 101 of the motor 10, the 1 st sun gear 111, the 1 st carrier 114, the 2 nd sun gear 115, the 2 nd carrier 118, and the main shaft 119 are coaxially arranged, have a common axis X, and the direction of the axis X coincides with the vertical direction.

Next, the transmission operation of the reduction gear train 11 will be described.

Referring to fig. 3 and 6, when the motor 10 is powered on and started, the output shaft 101 of the motor 10 rotates, and the rotation is transmitted to the planetary gear train on the upper side, specifically, the output shaft 101 drives the 1 st sun gear 111 coaxially fixed with the output shaft to rotate; rotation of the 1 st sun gear 111 is transmitted to the 1 st planetary gear 112 engaged therewith, and since the 1 st planetary gear 112 is also engaged with the 1 st internal gear 113 that is fixed so as not to rotate, the 1 st planetary gear 112 revolves around the 1 st sun gear 111 (i.e., around the axis X) while rotating; the 1 st planetary gear carrier 114 holding the 1 st planetary gear 112 is driven to rotate around the axis X due to the revolution thereof; the rotation of the 1 st carrier 114 is transmitted to the 2 nd sun gear 115 integrated therewith.

The operations in the lower planetary gear train are different between the high-speed mode and the low-speed mode. Specifically, referring to fig. 3, in the high speed mode, the 2 nd internal gear 117 is moved to the upper position and meshes with the external teeth of the 1 st carrier 114, and therefore the 2 nd internal gear 117 rotates integrally with the 1 st carrier 114 about the axis X. Since the 2 nd internal gear 117 rotates about the axis X, the 2 nd planetary gear 116 that meshes with the 2 nd internal gear 117 and the 2 nd sun gear 115 at the same time also rotates integrally with the 1 st carrier 114, that is, the 2 nd planetary gear 116 rotates only in common and does not rotate. The 2 nd planet gear 116 drives the 2 nd planet carrier 118 to rotate, and further rotates a main shaft 119 coaxially fixed with the 2 nd planet carrier 118. At this time, as described above, the 2 nd planetary gear 116 and the 1 st planetary gear 114 rotate integrally, and the 2 nd planetary gear 118 and the main shaft 119 also rotate integrally with the 1 st planetary gear 114, that is, the rotation transmission between the 1 st planetary gear 114, the 2 nd planetary gear 118 and the main shaft 119 is not decelerated, and the lower planetary gear train does not perform a deceleration function, so that the reduction gear train 10 is in the high speed mode.

In addition, as shown in fig. 6, in the low speed mode, the 2 nd internal gear 117 is moved to the lower position, and at this time, as described above, the engagement with the 1 st carrier 114 is released, and the 2 nd planetary gear 116 is engaged with the projection 110 fixed to the main body case 1 and is not rotated, so that the 2 nd planetary gear 116 rotates and revolves, and the rotation of the 1 st carrier 114 is transmitted to the 2 nd carrier 118 and further to the main shaft 119 at a reduced speed.

< lubricating oil supply mechanism >

As shown in fig. 2, 4, and 5, when the grinding and polishing machine 100 is used to perform a corresponding grinding or polishing operation, the grinding and polishing machine 100 is usually in an attitude in which the grinding wheel 6A or the polishing pad 6B faces downward (i.e., the axis X is in a vertical direction), and depending on the length of the machining time, it is sometimes necessary to maintain the attitude for a long period of time, and thus, in the reduction gear train 11, the lubricating oil gradually flows downward, and there is a possibility that lubrication failure occurs between some gears, particularly between gears of the upper planetary gear train, and abrasion occurs in the 1 st planetary gear 112, the pin shaft 112a supporting the 1 st planetary gear 112, the 1 st internal gear 113, and the like.

In order to solve this problem, in the present embodiment, a lubricating oil supply mechanism 7 for supplying lubricating oil to the gear train of the reduction gear train 11 is provided, and the lubricating oil supply mechanism 7 is mainly configured by the above-described motor bracket 14, the spacer 15, and the felt member 16 (fig. 8).

Specifically, as shown in fig. 3, 6 to 9, an annular recessed groove 14a is formed in the lower surface of the motor bracket 14, an annular felt member 16 is disposed in the recessed groove 14a, and a gasket 15 covers the opening of the recessed groove 14a from below, thereby forming a space S (lubricant oil retention space) for accommodating the felt member 16 and the lubricant oil. In addition, a plurality of through holes 15a are provided in the gasket 15 in the circumferential direction, and the through holes 15a communicate with the inner space of the groove 14 a. The gasket 15 corresponds to "a wall portion of the lubricant oil retention space toward the gear train" and "a covering member" in the present invention. The through hole 15a corresponds to an "oil supply hole" in the present invention.

By providing such a lubricating oil supply mechanism 7, when the polishing machine 100 is operated in a posture in which the grindstone 6A or the polishing pad 6B as a tool head is directed downward, the lubricating oil impregnated in the felt member 16 is gradually released, flows downward from the space S through the through hole 15a in the pad 15, lubricates the reduction gear train located below the pad 15 (particularly, the reduction gear train located above), and can prevent poor lubrication between gears and suppress wear of the gears.

In the present embodiment, as shown in fig. 9, the through hole 15a of the spacer 15 is set to be positioned substantially directly above the meshing section C of the 1 st planetary gear 112 and the 1 st internal gear 113. In this way, the lubricating oil can be efficiently supplied to the meshing portion C.

In the present embodiment, the recessed groove 14a (space S) is disposed at a position offset from directly above the meshing portion C toward the outer peripheral side (in the direction intersecting the direction of the axis X), and the lubricating oil can be guided to the meshing portion C by placing a part of the through hole 15a on the recessed groove 14a (space S) and placing the other part on the inner peripheral side (on the meshing portion C side) of the recessed groove 14a (space S) as viewed from the direction of the axis X.

In addition, lubricating oil having a kinematic viscosity of 90 to 110mm2/s (40 ℃) can be used, and thus it can be easily ensured that the amount of lubricating oil supplied is neither excessive nor insufficient in the case of long-term operation.

< spindle locking Structure >

As shown in fig. 1 and 2, a lock knob 12 is provided at a lower portion of the main body case 1, and the lock knob 12 includes an operation portion 121 exposed to the outside of the main body case 1, a lock pin 122 connected to the inside of the operation portion 121, and a return spring 123 for biasing the operation portion 121 outward. The main shaft 119 is provided with a lock hole 119 a. As shown in fig. 4 and 5, when the operator presses the operation portion 121, the lock pin 122 is inserted into the lock hole 119a of the spindle 119, so that the spindle 119 can be locked from rotation. In this state, the grinding wheel 6A and the polishing pad 6B can be easily attached and detached.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

For example, in the above embodiment, the felt member 16 is provided in the space S to be impregnated with the lubricating oil, but the present invention is not limited thereto, and other materials, such as sponge or other porous materials, may be used as the lubricating oil-impregnated member.

In addition, in the above embodiment, the reduction gear train 11 has the upper and lower two-stage planetary gear trains, and the two-stage planetary gear trains are coaxially arranged and have the common axis X extending in the vertical direction, however, the present invention is not limited thereto, and may be applied to a reduction gear train of another structure, for example, only one-stage planetary gear train.

Although the grinding and polishing machine 100 has been described as the electric power tool in the above embodiment, it goes without saying that the present invention is also applicable to other electric power tools.

In the above embodiment, the description has been given taking the example in which the lubricating oil supply mechanism 7 is disposed above the reduction gear train 11 in a state in which the grindstone 6A or the polishing pad 6B is facing downward, but since the electric power tool does not normally have a fixed usage posture, the directional relationship between the lubricating oil supply mechanism 7 and the reduction gear train 11 in the above embodiment does not limit the present invention.

Claims (12)

1. A reduction gear oil supply structure of a power tool, the power tool having: a motor (10), a spindle (119), and a reduction gear train (11), the reduction gear train (11) transmitting the power of the motor (10) to the spindle (119) at a reduced speed, characterized in that,

a lubricating oil supply mechanism (7) for supplying lubricating oil to the reduction gear train (11) is arranged near the reduction gear train (11),

the lubricating oil supply mechanism (7) has a lubricating oil retention space (S) in which a lubricating oil-impregnated member is housed.

2. The reduction gear oil supply structure of an electric tool according to claim 1, wherein the lubricant oil retention space (S) has a wall portion facing the reduction gear train (11), and the wall portion is provided with an oil supply hole therethrough.

3. The reduction gear oil supply structure of the electric tool according to claim 2, wherein the lubricating oil supply mechanism (7) is disposed on a side of the reduction gear train (11) away from the spindle (119) in an axial direction of the spindle (119).

4. The reduction gear oil supply structure of the electric power tool according to claim 2, wherein the lubricating oil supply mechanism (7) includes a partition member and a cover member,

the separating member is arranged between the motor (10) and the reduction gear train (11), a groove (14a) is provided on a surface of the separating member facing the reduction gear train (11),

the opening of the groove (14a) is covered with the covering member to constitute the lubricant oil retention space (S),

the covering member constitutes the wall portion, and the oil supply hole is opened in the covering member.

5. The reduction gear oil supply structure of the electric power tool according to claim 4,

an output shaft (101) of the motor (10) is rotatably mounted on the partition member,

the groove (14a) is annular with a rotation axis (X) of the output shaft (101) as a center,

the covering member is an annular gasket.

6. A reduction gear oil supply structure of an electric tool according to claim 5,

the reduction gear train (11) is a planetary reduction gear train, and has:

a 1 st sun gear (111) fixed coaxially with the output shaft (101);

a plurality of 1 st planetary gears (112) arranged on the outer periphery of the 1 st sun gear (111) and meshed therewith;

a 1 st ring gear (113) disposed on and meshed with the outer peripheries of the 1 st planetary gears (112),

the oil supply hole is arranged at a position substantially overlapping a meshing section (C) between the 1 st planetary gear (112) and the 1 st internal gear (113) when viewed in the direction of the axis (X) of the output shaft (101).

7. A reduction gear oil supply structure of an electric tool according to claim 6,

the recessed groove (14a) is disposed at a position offset from the meshing section (C) when viewed in the direction of the axis (X), and the oil supply hole has a portion located at a position overlapping the recessed groove (14a) and a portion located at a position overlapping the meshing section (C).

8. A reduction gear oil supply structure of an electric tool according to claim 6,

the reduction gear train (11) further has:

a 1 st planetary carrier (114) that rotatably holds a plurality of the 1 st planetary gears (112);

a 2 nd sun gear (115) that rotates integrally with the 1 st carrier (114);

a plurality of 2 nd planetary gears (116) arranged on the outer periphery of the 2 nd sun gear (115) and meshed therewith;

a 2 nd internal gear (117) that is disposed on the outer periphery of the plurality of 2 nd planetary gears (116) and meshes therewith;

a 2 nd planetary carrier (118) that rotatably holds a plurality of the 2 nd planetary gears (116),

the main shaft (119) is connected to the 2 nd planetary carrier (118) so as to rotate integrally,

the output shaft (101), the 1 st sun gear (111), the 1 st carrier (114), the 2 nd sun gear (115), the 2 nd carrier (118), and the main shaft (119) are coaxially arranged, and share the axis (X).

9. The reduction gear oil supply structure of the electric power tool according to claim 8,

the periphery of the 1 st planet carrier (114) is provided with external teeth,

the 2 nd inner gear (117) is movable along the direction of the axis (X) between a 1 st position and a 2 nd position,

in the 1 st position, the 2 nd internal gear (117) is meshed with the external teeth of the 1 st planet carrier (114) and the 2 nd planet gear (116) at the same time, and can rotate integrally with the 1 st planet carrier (114);

in the 2 nd position, the 2 nd internal gear (117) is disengaged from the external teeth of the 1 st carrier (114) and is fixed against rotation.

10. The reduction gear oil supply structure of the electric power tool according to any one of claims 4 to 9, wherein the partition member is a motor bracket (14) supporting the motor (10).

11. The oil supply structure for a reduction gear of an electric power tool according to any one of claims 2 to 9, wherein the lubricant-impregnated member is made of a felt material.

12. An electric power tool characterized by having the reduction gear oil supply structure of any one of claims 1 to 11.

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