CN220113193U - Impact tool - Google Patents

Abstract

The utility model discloses an impact tool, comprising: the shell is internally provided with a plurality of mounting holes along the axial direction, the mounting holes are internally provided with a moving part and an elastic part, the elastic part is arranged between the moving part and the hole bottom end surface of the mounting holes, and the elastic part has the tendency that the moving part at least partially exposes out of the mounting holes; the motor is arranged in the shell and comprises a motor shaft; the speed reducing mechanism is arranged in the shell and is linked with the motor shaft, the speed reducing mechanism comprises a gear ring, the peripheral wall of the gear ring extends outwards to form a ring part, and the ring part extends towards the motor to form a boss; the impact mechanism is installed in linkage with the speed reducing mechanism; in the first state, the moving part is propped against the boss, and the gear ring is fixed in the shell; in the second state, the moving part slides on the surface of the ring part facing the motor, and the gear ring can rotate around the axis of the moving part. The utility model provides an impact tool which is used for locking or unlocking a gear ring along the axial direction and avoiding changing the axial position of the gear ring, so that the transmission stability and reliability of the whole speed reduction mechanism are maintained.

Description

Impact tool

Technical Field

The utility model belongs to the technical field of electric tools, and particularly relates to an impact tool.

Background

The impact tool in the electric tool is a tool which uses the impact mechanism to continuously impact the output shaft to generate locking torque, and when the power of the motor is transmitted to the impact mechanism through the speed reducing mechanism consisting of the planetary gear train, the impact mechanism continuously impacts the output shaft, and the output shaft can act on a workpiece to be processed so as to realize the locking of the workpiece.

When the fastening operation is carried out under high load, the impact energy generated by impact reaction of the impact block in the impact mechanism is retracted towards the motor, and when the impact energy is retracted to a final position, if the impact energy is not released completely and the impact energy continues to rotate, the impact load at the moment can be transmitted into the planetary gear train, so that overload of the speed reduction mechanism is caused, further, the durability of the internal structure is reduced, the stability and the reliability of the transmission of the whole speed reduction mechanism are affected, and finally, the whole electric tool cannot be used.

Accordingly, in view of the above-described problems, it is necessary to provide an impact tool.

Disclosure of Invention

In view of the above, an object of the present utility model is to provide an impact tool.

In order to achieve the above object, an embodiment of the present utility model provides the following technical solution:

an impact tool, the impact tool comprising:

the shell is internally provided with a plurality of mounting holes along the axial direction, the mounting holes are internally provided with moving parts and elastic parts, the elastic parts are arranged between the moving parts and the hole bottom end surfaces of the mounting holes, and the elastic parts have a tendency that the moving parts are at least partially exposed out of the mounting holes;

the motor is arranged in the shell and comprises a motor shaft;

the speed reducing mechanism is arranged in the shell and is linked with the motor shaft, the speed reducing mechanism comprises a plurality of planetary gear trains, the planetary gear trains comprise gear rings, the peripheral walls of the gear rings outwards extend to form ring parts, and the ring parts extend towards the motor to form bosses;

the impact mechanism is installed in linkage with the speed reducing mechanism, and the speed reducing mechanism is positioned between the motor and the impact mechanism;

in a first state, the moving part is propped against the boss, and the gear ring is fixed in the shell; in the second state, the moving piece slides on the surface of the ring part, which faces the motor, and the gear ring can rotate around the axis of the gear ring.

In an embodiment, the boss includes a first abutment surface and a second abutment surface, and in the first state, the moving member abuts against the first abutment surface or the second abutment surface.

In an embodiment, a first included angle θ1 is formed between the first abutting surface and the surface of the ring portion facing the motor, a second included angle θ2 is formed between the second abutting surface and the surface of the ring portion facing the motor, the first included angle θ1 is greater than 90 ° and less than 180 °, and the second included angle θ2 is greater than 90 ° and less than 180 °.

In an embodiment, a first chamfer is arranged between the first abutting surface and the surface of the ring part facing the motor, the radius of the first chamfer is smaller than that of the moving part, a second chamfer is arranged between the second abutting surface and the surface of the ring part facing the motor, and the radius of the second chamfer is smaller than that of the moving part.

In an embodiment, a connection surface is disposed between the first abutting surface and the second abutting surface, and the connection surface is a convex arc surface.

In an embodiment, the moving member is a ball, a first groove is formed in the first abutting surface, a second groove is formed in the connecting surface, a third groove is formed in the second abutting surface, a fourth groove is formed in the surface, facing the motor, of the ring portion, and the first groove, the second groove, the third groove and the fourth groove enclose a sliding rail for the moving member to slide.

In an embodiment, on a radial section of the gear ring, a section of the sliding rail is arc-shaped, and a radius of the sliding rail is greater than or equal to a radius of the ball.

In an embodiment, the moving member is a rolling member, and a connecting column is further disposed between the rolling member and the elastic member.

In an embodiment, a clamping groove is formed in the machine shell, the impact tool further comprises a clamping ring, the clamping ring is arranged in the clamping groove, and the surface, away from the motor, of the ring portion abuts against the clamping ring.

In an embodiment, the impact mechanism comprises an intermediate shaft which is installed in linkage with the speed reducing mechanism, an impact block is sleeved on the intermediate shaft, an impact spring is arranged between the impact block and the intermediate shaft, a movable groove is arranged on the intermediate shaft, and a movable connecting piece is arranged between the impact block and the intermediate shaft and slides in the movable groove so that the impact block rotates around the axis of the impact block and reciprocates along the axial direction.

The utility model has the following beneficial effects:

the utility model provides an impact tool, which is characterized in that a plurality of bosses, a moving part and an elastic part, wherein the moving part and the elastic part are matched with the bosses and are arranged on a gear ring along the axial direction, so that the gear ring can be fixed in a shell within a bearable highest load value or rotate around a central axis when bearing a load value larger than the highest load value, the rotation energy is absorbed, the mutual abrasion among internal parts of a speed reducing mechanism is avoided, the durability is improved, and the service life of the impact tool is effectively prolonged;

the impact tool provided by the utility model can complete locking or unlocking of the gear ring along the axial direction, and avoid changing the axial position of the gear ring, so that the transmission stability of the whole speed reduction mechanism is maintained.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present utility model, and other drawings may be obtained according to the drawings without inventive effort to those skilled in the art.

FIG. 1 is a schematic cross-sectional view of an impact tool according to an embodiment of the present utility model;

FIG. 2 is a schematic perspective view of a part of the structure of an impact tool according to an embodiment of the present utility model;

FIG. 3 is a schematic perspective view of an impact mechanism according to an embodiment of the present utility model;

FIG. 4 is a schematic perspective view of a gear ring according to an embodiment of the present utility model;

FIG. 5 is an enlarged schematic view showing a partial structure of a ring gear in an embodiment of the utility model;

FIG. 6 is a schematic cross-sectional view of a gear ring and a moving member according to an embodiment of the present utility model;

FIG. 7 is an enlarged view of a partial structure at A in FIG. 6;

FIG. 8 is a schematic perspective view of a gear ring, a moving member, a connecting post, and an elastic member in a first state according to an embodiment of the present utility model;

fig. 9 is a schematic perspective view of a gear ring, a moving member, a connecting post, and an elastic member in a second state according to an embodiment of the present utility model.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The mechanisms of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the embodiments of the present utility model, it should be understood that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like indicate orientations or positional relationships based on those shown in the drawings, or those conventionally put in place when the product of the application is used, or those conventionally understood by those skilled in the art, merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element to be referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

In the description of the embodiments of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the description of the embodiments of the present utility model, it should be further noted that the terms "first", "second", and the like used herein do not particularly refer to the order or sequence, nor are they intended to be limiting, but are merely used to distinguish between mechanisms or operations described in the same technical terms.

It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other.

The technical scheme of the utility model will be described below with reference to the accompanying drawings.

Referring to fig. 1 to 4, an impact tool according to an embodiment of the present utility model includes: the machine shell 1 is internally provided with a plurality of mounting holes 11 along the axial direction, the mounting holes 11 are internally provided with a moving part 2 and an elastic part 3, the elastic part 3 is arranged between the moving part 2 and the hole bottom end surface of the mounting holes 11, and the elastic part 3 has the tendency that the moving part 2 at least partially exposes out of the mounting holes 11; a motor 5 provided in the casing 1, the motor 5 including a motor shaft 51; the speed reducing mechanism 6 is arranged in the shell 1 and is linked with the motor shaft 51, the speed reducing mechanism 6 comprises a plurality of planetary gear trains, each planetary gear train comprises a gear ring 61, the outer peripheral wall of each gear ring 61 extends outwards to form a ring part 611, and each ring part 611 extends towards the motor 5 to form a boss 612; the impact mechanism 7 is installed in linkage with the speed reducing mechanism 6, and the speed reducing mechanism 6 is positioned between the motor 5 and the impact mechanism 7; in the first state, the moving member 2 abuts against the boss 612, and the gear ring 61 is fixed in the casing 1; in the second state, the mover 2 slides on the surface of the ring portion 611 facing the motor 5, and the ring gear 61 is rotatable about its axis.

It should be noted that, in this embodiment, the motor shaft 51 is provided with the motor gear 52, the speed reducing mechanism 6 includes a plurality of planetary gear trains, the planetary gear trains include planetary gears 62 and a planet carrier 63 in addition to the gear ring 61, the planetary gear 62 closest to the motor 5 is meshed with the motor gear 52 on the motor shaft 51, and the planet carrier 63 furthest from the motor 5 is mounted in linkage with the impact mechanism 7, so that the power output from one end of the motor shaft 51 by the motor shaft 5 can be transmitted to the impact mechanism 7 after being reduced by the speed reducing mechanism 6.

Referring to fig. 3, the impact mechanism 7 includes an intermediate shaft 71 mounted in linkage with the reduction mechanism 6, an impact block 72 is sleeved on the intermediate shaft 71, an impact spring 73 is disposed between the impact block 72 and the intermediate shaft 71, a movable groove 711 is disposed on the intermediate shaft 71, a movable connecting member 74 is disposed between the impact block 72 and the intermediate shaft 71, and the movable connecting member 74 slides in the movable groove 711, so that the impact block 72 rotates around its axis and reciprocates axially.

According to the design, the intermediate shaft 71 in the present embodiment rotates around its axis under the action of the planet carrier 63 in the speed reducing mechanism 6, wherein the intermediate shaft 71 drives the impact block 72 to rotate through the movable connecting piece 74 respectively linked with the impact block 72 and the intermediate shaft 71, meanwhile, due to the movable groove 711 arranged on the intermediate shaft 71, the movable groove 711 is in a herringbone shape, when the movable connecting piece 74 slides in the movable groove 711, the impact block 72 can be driven to reciprocate along the axial direction, so that the torque force is transmitted to the workpiece to be processed under the action of the impact mechanism 7, and the locking of the workpiece to be processed is realized.

Preferably, the moving member 2 in this embodiment includes a rolling member or a sliding member, wherein when the moving member 2 is a rolling member, the rolling member may be a ball or a roller, which can achieve the same technical effect, as will be understood and appreciated by those skilled in the art. When the moving member 2 is a rolling member, a connecting column 4 is arranged between the rolling member and the elastic member 3, so that the elastic force on the elastic member 3 can be better transferred to the moving member 2 through the connecting column 4. When the mover 2 is a slider, it may be provided as a slide pin having a convex shape toward the side of the ring gear 61, which is understood and accepted by those skilled in the art.

In order to enhance the stability of the impact tool in use, the elastic member 3 in this embodiment is a compression elastic member 3, wherein the elastic member 3 may be any structure capable of providing elastic force, such as a spring, a shrapnel, an air bag, etc., as will be understood and accepted by those skilled in the art.

It should be noted that, in an electric tool, particularly in an impact tool (such as an impact wrench), in a normal working state, since an output end of the impact tool abuts against a workpiece to be processed to drive the workpiece to be processed to rotate, the workpiece to be processed is mounted on a surface to be processed, in this process, a reaction force caused by the impact is transmitted from the output end of the impact tool back to the impact mechanism 7 and is transmitted back to the speed reducing mechanism 6 through the impact mechanism 7, the transmission of the planetary gear train is affected by the internal structure, and when the gear ring 61 is in a fixed state, the planetary gear 62 rotates around the shaft and drives the planet carrier 63 to rotate, so that the power of the motor 5 can be transmitted to the impact mechanism 7; when the ring gear 61 is in the non-fixed state, the ring gear 61 and the planetary gear 62 rotate together around the shaft, and the carrier 63 does not rotate any more, so that the power of the motor 5 cannot be transmitted to the impact mechanism 7.

Since the gear ring 61 of the reduction gear 6 in the conventional impact tool is fixedly mounted on the casing 1, the gear ring 61 is subjected to the torque force transmitted back from the impact mechanism 7, and there may be an overload condition, in which the engagement between the gear ring 61 and the planetary gear 62 and the carrier 63 in the gear ring 61 are also affected by the torque force, so that the friction between the gears is increased, and the internal structure of the reduction gear 6 is excessively worn, thereby reducing the service life of the impact mechanism 7.

Referring to fig. 8 and 9, in this embodiment, the gear ring 61 is not completely fixedly mounted in the casing 1, the ring portion 611 of the gear ring 61 is provided with a boss 612 designed toward the motor 5, the casing 1 is provided with a moving member 2 and an elastic member 3 which are matched with the boss 612, the moving member 2 always contacts the surface of the ring portion 611 or the boss 612 toward the motor 5 under the action of the elastic member 3, and the impact tool has two states:

in the first state: if the impact mechanism 7 does not generate reaction force to the speed reducing mechanism 6, the torque force caused by the impact mechanism 7 is not formed on the gear ring 61, the gear ring 61 is fixed in the shell 1, and the power of the motor 5 can be transmitted to the impact mechanism 7 through the planetary gear train;

if the impact mechanism 7 generates a reaction force to the speed reducing mechanism 6, a recoil force generated by impacting a workpiece to be processed acts on the speed reducing mechanism 6, a torsion force caused by the impact mechanism 7 is formed on the gear ring 61, so that the gear ring 61 has a tendency to rotate around the axis of the gear ring, when the torsion force is small, the elastic member 3 arranged along the axial direction drives the movable member 2 to always have a movement tendency away from the motor 5, the movable member 2 and the boss 612 can form a mutually abutting position relation, in this case, a component force formed by the torsion force at the abutting position and a component force formed by the elastic member 3 transmitting to the movable member 2 together cannot drive the movable member 2 to retract into the mounting hole 11 towards the motor 5 by overcoming the elastic force of the elastic member 3, the movable member 2 still keeps an abutting state with the abutting portion, and the gear ring 61 cannot rotate around the shaft and be locked in the casing 1, so that the power of the motor 5 can be transmitted to the impact mechanism 7 through the speed reducing mechanism 6.

Meanwhile, the thickness of the ring portion 611 is thicker, so that when the first state and the second state are continuously switched, after the elastic force of the elastic member 3 is applied to the moving member 2, the moving member 2 continuously abuts against the boss 612 in the moving process of the moving member 2, the structural strength of the whole gear ring 61 is stronger, cracks are avoided, and the reliability of the impact tool is strong.

In the second state, if the impact mechanism 7 generates a reaction force to the speed reducing mechanism 6, a recoil force generated by impacting the workpiece to be processed acts on the speed reducing mechanism 6, the gear ring 61 is provided with a torsion force caused by the impact mechanism 7, so that the gear ring 61 has a tendency to rotate around the axis thereof, when the torsion force is large, the load on the gear ring 61 is too high, in this case, a component force generated by the torsion force at the abutting position and a component force generated by the elastic force of the elastic member 3 transmitted to the moving member 2 together form a resultant force, which drives the moving member 2 to retract towards the motor 5 against the elastic force of the elastic member 3, the gear ring 61 can rotate around the axis under the action of the torsion force, and in the process of rotating the gear ring 61 around the axis, the moving member 2 slides along the surface of the boss 612 and then moves onto the surface of the ring 611 towards the motor 5, so that the load on the gear ring 61 is slowly reduced, and the power of the motor 5 cannot be transmitted to the impact mechanism 7 through the speed reducing mechanism 6. During the rotation of the gear ring 61, the moving member 2 is abutted against the next boss 612 and separated until the component force generated by the abutting part of the moving member 2 against the last boss 612 under the action of the elastic member 3 and the component force generated by the residual load torsion at the abutting part together form a resultant force, and when the moving member 2 cannot be driven to move towards the motor 5 against the elastic force of the elastic member 3 to retract into the mounting hole 11, the moving member 2 abuts against the last boss 612, so that the gear ring 61 returns to the first state again, namely, the gear ring 61 is locked in the casing 1, and the power of the motor 5 can be transmitted to the impact mechanism 7 through the speed reducing mechanism 6.

It is emphasized that the elastic force of the elastic member 3 received by the moving member 2 in the present embodiment is distributed along the axial direction, so that when the moving member 2 and the boss 612 abut against each other, the force of the elastic member 3 is also transferred to the gear ring 61 in the axial direction, and because the gear ring 61 is fixed in the casing 1 in the axial direction, the effects of the moving member 2 and the elastic member 3 on the gear ring 61 are small, if a plurality of moving members 2 and elastic members 3 are provided, and if a plurality of elastic members 3 fail in action, the elastic force is transferred in the axial direction, the center of the gear ring 61 is deviated from the initial axis when the gear ring 61 is twisted, so that the power transmission of the whole reduction mechanism 6 is deviated, and finally the transmission impact effect of the whole impact tool is affected.

In one or more embodiments, referring to fig. 1 and 2, a clamping groove 12 is provided in the casing 1 in this embodiment, the impact tool further includes a clamping ring 8, the clamping ring 8 is provided in the clamping groove 12, and a surface of the ring 611 away from the motor 5 abuts against the clamping ring 8. The collar 8 is provided with a notch 81, so that the collar 8 can deform under the stress condition, and is clamped in the clamping groove 12 of the casing 1. According to the design, the gear ring 61 in the speed reducing mechanism 6 can be axially fixed, and the gear ring 61 is prevented from generating position deviation in the axial direction in the process of rotating around the shaft under the torque force, so that the transmission effect of the whole speed reducing mechanism 6 is affected.

In one or more embodiments, referring to fig. 4 and 5, the boss 612 in this embodiment includes a first abutment surface 6121 and a second abutment surface 6122, and in the first state, the moving member 2 abuts against the first abutment surface 6121 or the second abutment surface 6122. The first abutment surface 6121 and/or the second abutment surface 6122 may be a plane, an arc surface, a special plane (e.g. a slightly wavy surface), etc. as will be appreciated and accepted by those skilled in the art. It should be noted that, due to the difference of the stress during the impact working in the working state or the dismounting process, the gear ring 61 may have two rotation tendencies of clockwise rotation or counterclockwise rotation, so that the moving member 2 abuts against the second abutment surface 6122 during clockwise rotation, and the moving member 2 abuts against the first abutment surface 6121 during counterclockwise rotation.

In one or more embodiments, in order to better make the gear ring 61 in the first state more stable and reliable by abutting between the moving member 2 and the first abutting surface 6121 or the second abutting surface 6122, and prevent the torque force that the gear ring 61 can bear from being too small, and avoid that the reduction mechanism 6 cannot transmit the power of the motor 5 to the impact mechanism 7, thereby affecting the effective use of the whole impact tool, referring to fig. 5, a first included angle θ1 is formed between the first abutting surface 6121 and the surface of the ring portion 611 facing the motor 5, a second included angle θ2 is formed between the second abutting surface 6122 and the surface of the ring portion 611 facing the motor 5, and the first included angle θ1 is greater than 90 ° and less than 180 °, and the second included angle θ2 is greater than 90 ° and less than 180 °. Preferably, the first included angle θ1 is greater than 90 ° and less than 135 °, and the second included angle θ2 is greater than 90 ° and less than 135 °.

In one or more embodiments, referring to fig. 5, a first chamfer 613 is provided between the first abutment surface 6121 and the surface of the ring portion 611 facing the motor 5 in this embodiment, the radius of the first chamfer 613 is smaller than the radius of the moving member 2, a second chamfer 614 is provided between the second abutment surface 6122 and the surface of the ring portion 611 facing the motor 5, and the radius of the second chamfer 614 is smaller than the radius of the moving member 2. According to the design, the structural strength of the connection between the boss 612 and the ring 611 is enhanced, and when the moving member 2 abuts against the boss 612 under the action of the elastic member 3, the moving member 2 can always abut against the first abutting surface 6121 or the second abutting surface 6122, so that the moving member 2 is prevented from contacting the first chamfer 613 or the second chamfer 614, and the reliability of the whole impact tool is enhanced.

In one or more embodiments, in order to make the surface of the boss 612 or the ring 611 facing the motor 5 of the moving member 2 smoother, referring to fig. 5, a connection surface 6123 is provided between the first abutment surface 6121 and the second abutment surface 6122 in this embodiment, and the connection surface 6123 is a convex arc surface. According to this design, when the moving member 2 in the present embodiment moves to the second abutment surface 6122 after the first abutment surface 6121 abuts against, the moving member can slide to a connection surface 6123 with a convex arc surface and then slide to the second abutment surface 6122; or, when the moving member 2 moves to the first abutment surface after the second abutment surface 6122 abuts against, the moving member may slide to a connection surface 6123 with a convex arc surface and then slide to the first abutment surface 6121. Therefore, the moving part 2 runs smoothly without blocking, friction between the moving part 2 and the boss 612 is small, abrasion to the moving part 2 and the boss 612 is avoided, and user experience and service life of the whole impact tool are influenced; meanwhile, due to the design of the convex cambered surface, the movable part 2 can be prevented from suddenly sliding to the connecting surface 6123 to be blocked on the connecting surface, so that the movable part 2 cannot form an abutting relationship with other structures, the structure is stable and low in reliability, and the transmission effect of the speed reducing mechanism 6 is easily influenced.

Preferably, when there is no smooth transition between the connection surface 6123 and the first abutment surface 6121 and between the connection surface 6123 and the second abutment surface 6122 in the present embodiment, as shown in fig. 5, a third chamfer 615 may be provided between the first abutment surface 6121 and the connection surface 6123, and a fourth chamfer 616 may be provided between the second abutment surface 6122 and the connection surface 6123 in the present embodiment. According to the design, the whole boss 612 and the surface of the ring 611 facing the motor 5 can be designed to be smooth, so that the moving part 2 can slide on the boss, the abrasion of the moving part 2 is reduced, and the service life is prolonged.

In one or more embodiments, referring to fig. 4, the moving member 2 in this embodiment is a ball, a first groove 6171 is formed on the first abutting surface 6121, a second groove 6172 is formed on the connecting surface 6123, a third groove 6173 is formed on the second abutting surface 6122, a fourth groove 6174 is formed on the surface of the ring portion 611 facing the motor 5, and the first groove 6171, the second groove 6172, the third groove 6173, and the fourth groove 6174 enclose a sliding rail 617 for sliding the moving member 2. According to the design, when the balls slide on the surface of the boss 612 and the ring 611 facing the motor 5, the balls are always limited to slide in the extending direction of the slide rail 617, so that deviation of the movement of the balls is avoided, the transmission effect of the speed reducing mechanism 6 in the whole impact tool is affected, and the structural stability and reliability of the whole impact tool are enhanced.

Preferably, referring to fig. 6 and 7, in the present embodiment, the cross section of the slide rail 617 is circular arc in the radial cross section of the ring gear 61, and the radius of the slide rail 617 is greater than or equal to the radius of the balls. According to the design, the balls can be always contained in the sliding rail 617, when the radius of the sliding rail 617 is larger than that of the balls, the balls are in point contact with the sliding rail 617, when the radius of the sliding rail 617 is equal to that of the balls, the sliding rail 617 and the balls are in line contact, the balls can be well limited and guided during sliding, and large friction between the balls and the balls is prevented, so that abrasion is caused to the smooth surface of the balls, and the service life of the balls is influenced.

The technical scheme shows that the utility model has the following beneficial effects:

the utility model provides an impact tool, which is characterized in that a plurality of bosses, a moving part and an elastic part, wherein the moving part and the elastic part are matched with the bosses and are arranged on a gear ring along the axial direction, so that the gear ring can be fixed in a shell within a bearable highest load value or rotate around a central axis when bearing a load value larger than the highest load value, the rotation energy is absorbed, the mutual abrasion among internal parts of a speed reducing mechanism is avoided, the durability is improved, and the service life of the impact tool is effectively prolonged;

the impact tool provided by the utility model can complete locking or unlocking of the gear ring along the axial direction, and avoid changing the axial position of the gear ring, so that the transmission stability of the whole speed reduction mechanism is maintained.

It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present disclosure describes embodiments in terms of embodiments, not every embodiment is provided with a separate technical solution, and this description is for clarity only, and those skilled in the art should consider the disclosure as a whole, and the technical solutions in the embodiments may be combined appropriately to form other embodiments that can be understood by those skilled in the art.

Claims (10)

1. An impact tool, characterized in that the impact tool comprises:

the shell is internally provided with a plurality of mounting holes along the axial direction, the mounting holes are internally provided with moving parts and elastic parts, the elastic parts are arranged between the moving parts and the hole bottom end surfaces of the mounting holes, and the elastic parts have a tendency that the moving parts are at least partially exposed out of the mounting holes;

the motor is arranged in the shell and comprises a motor shaft;

the speed reducing mechanism is arranged in the shell and is linked with the motor shaft, the speed reducing mechanism comprises a plurality of planetary gear trains, the planetary gear trains comprise gear rings, the peripheral walls of the gear rings outwards extend to form ring parts, and the ring parts extend towards the motor to form bosses;

the impact mechanism is installed in linkage with the speed reducing mechanism, and the speed reducing mechanism is positioned between the motor and the impact mechanism;

in a first state, the moving part is propped against the boss, and the gear ring is fixed in the shell; in the second state, the moving piece slides on the surface of the ring part, which faces the motor, and the gear ring can rotate around the axis of the gear ring.

2. The impact tool of claim 1, wherein the boss includes a first abutment surface and a second abutment surface, the moving member abutting the first abutment surface or the second abutment surface in the first state.

3. The impact tool of claim 2, wherein a first angle θ1 is formed between the first abutment surface and the surface of the ring facing the motor, a second angle θ2 is formed between the second abutment surface and the surface of the ring facing the motor, the first angle θ1 being greater than 90 ° and less than 180 °, the second angle θ2 being greater than 90 ° and less than 180 °.

4. The impact tool of claim 2, wherein a first chamfer is provided between the first abutment surface and the surface of the ring facing the motor, the first chamfer having a radius smaller than the radius of the moving member, and a second chamfer is provided between the second abutment surface and the surface of the ring facing the motor, the second chamfer having a radius smaller than the radius of the moving member.

5. The impact tool of claim 2, wherein a connection surface is provided between the first abutment surface and the second abutment surface, the connection surface being a convex arc surface.

6. The impact tool of claim 5, wherein the moving member is a ball, a first groove is formed in the first abutting surface, a second groove is formed in the connecting surface, a third groove is formed in the second abutting surface, a fourth groove is formed in the surface, facing the motor, of the ring portion, and the first groove, the second groove, the third groove and the fourth groove enclose a sliding rail for the moving member to slide.

7. The impact tool of claim 6, wherein the cross section of the slide rail is circular arc-shaped in a radial cross section of the ring gear, and a radius of the slide rail is greater than or equal to a radius of the ball.

8. The impact tool of claim 1, wherein the moving member is a rolling member, and a connecting post is further provided between the rolling member and the elastic member.

9. The impact tool of claim 1, wherein a clamping groove is formed in the housing, the impact tool further comprising a collar disposed in the clamping groove, a surface of the ring portion remote from the motor abutting the collar.

10. The impact tool according to claim 1, wherein the impact mechanism comprises an intermediate shaft which is installed in linkage with the speed reducing mechanism, an impact block is sleeved on the intermediate shaft, an impact spring is arranged between the impact block and the intermediate shaft, a movable groove is arranged on the intermediate shaft, a movable connecting piece is arranged between the impact block and the intermediate shaft, and the movable connecting piece slides in the movable groove so as to enable the impact block to rotate around the axis of the impact block and reciprocate along the axial direction.