CN215238018U - Impact mechanism and impact drill - Google Patents

Abstract

The application provides an impact mechanism and an impact drill, wherein the impact mechanism comprises a main shaft, a movable end tooth, a static end tooth, a limiting part used for limiting the rotation of the static end tooth and a driving part used for driving the limiting part to move, the movable end tooth is fixed on the main shaft, the movable end tooth comprises a first meshing tooth, and the static end tooth comprises a second meshing tooth meshed with the first meshing tooth; the limiting piece is provided with a first position for limiting the rotation of the static end tooth and a second position for allowing the static end tooth and the movable end tooth to rotate synchronously. In the switching process of the impact mode and the drilling mode, only the position of the limiting piece needs to be adjusted, moving and static end teeth are not needed, the reliability of the impact mechanism is improved, and meanwhile, the structure is simplified.

Description

Impact mechanism and impact drill

Technical Field

The application relates to the field of electric tools, in particular to an impact mechanism and an impact drill.

Background

A percussion drill is an electric tool having both percussion and drilling functions. Percussion drills typically comprise a main shaft, a moving end tooth fixed to the main shaft and movable with the main shaft, and a stationary end tooth for cooperation with the moving end tooth. The end surfaces of the movable end teeth and the static end teeth are respectively provided with meshing teeth to realize meshing or disengaging. When the movable end teeth are meshed with the fixed end teeth, the impact drill is in an impact mode; when the movable end teeth and the fixed end teeth are not meshed, the impact drill is in a drilling mode or a torsion adjusting mode. Because the switching between the meshing state and the non-meshing state of the movable end tooth and the static end tooth needs to be realized by moving the movable end tooth, the meshing reliability is reduced, and the structure is more complex.

SUMMERY OF THE UTILITY MODEL

The application provides a simple structure and high impact mechanism of reliability and strike and bore.

Specifically, the application provides an impact mechanism for an impact drill, the impact mechanism comprises a main shaft, a movable end tooth, a static end tooth, a limiting piece for limiting rotation of the static end tooth and a driving piece for driving the limiting piece to move, the movable end tooth is fixed on the main shaft, the movable end tooth comprises a first meshing tooth, and the static end tooth comprises a second meshing tooth meshed with the first meshing tooth; the limiting piece is provided with a first position for limiting the rotation of the static end tooth and a second position for allowing the static end tooth and the movable end tooth to rotate synchronously.

Further, the fixed end tooth comprises a plurality of notches arranged along the circumferential direction of the fixed end tooth, and the limiting element comprises a limiting protrusion; when the limiting piece is located at the first position, the limiting protrusion is matched with the notch to limit the rotation of the static end tooth.

Furthermore, the driving part is rotatably arranged to drive the limiting part to move along the axial direction of the main shaft.

Further, the limiting piece comprises a stress part connected with the positioning protrusion; the driving piece is provided with a force application part abutted against the force bearing part and is configured to transmit operation force to the limiting element.

Further, the force application part is provided with a spiral surface abutting against the force receiving part.

Furthermore, the limiting protrusion is provided with an inclined surface which is arranged at an angle relative to the axial direction of the main shaft.

Further, when the spindle is not driven, the first meshing tooth and the second meshing tooth are always kept in a meshing state.

Further, when the limiting member is located at the first position, the movable end tooth and the fixed end tooth are located in a space surrounded by the limiting member.

In another aspect, the present application further provides a percussion drill, which includes a casing, a motor disposed in the casing, and the percussion mechanism as described above, where the motor is configured to drive the percussion mechanism.

Further, when the limiting piece is located at the first position, the impact drill is in an impact mode; and when the limiting piece is positioned at the second position, the impact drill is in a drilling mode.

In the switching process of the impact mode and the drilling mode, only the position of the limiting piece needs to be adjusted, moving and static end teeth are not needed, the reliability of the impact mechanism is improved, and meanwhile, the structure is simplified.

Drawings

FIG. 1 is an assembled schematic view of an embodiment of an impact mechanism of the present application.

Fig. 2 is an exploded schematic view of the impact mechanism shown in fig. 1.

Fig. 3 is an exploded view of the movable end tooth, the stationary end tooth, the limiting member and the first driving member of the impact mechanism shown in fig. 1.

Fig. 4 is an exploded schematic view of the movable end tooth, the stationary end tooth, and the stopper of the impact mechanism shown in fig. 1.

Fig. 5 is an assembly schematic diagram of the movable end tooth, the stationary end tooth, and the limiting member when the impact mechanism shown in fig. 1 is in the impact mode.

FIG. 6 is an assembled schematic view of an embodiment of the present disclosure.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by those of ordinary skill in the art to which the invention belongs. As used in this application, the terms "first," "second," and the like do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. "plurality" or "a number" means two or more. Unless otherwise indicated, "front", "rear", "lower" and/or "upper" and the like are for convenience of description and are not limited to one position or one spatial orientation. The word "comprising" or "comprises", and the like, means that the element or item listed as preceding "comprising" or "includes" covers the element or item listed as following "comprising" or "includes" and its equivalents, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

The application provides an impact mechanism for an impact drill, the impact mechanism comprises a main shaft, a movable end tooth, a static end tooth, a limiting part for limiting rotation of the static end tooth and a driving part for driving the limiting part to move axially along the main shaft, the movable end tooth is fixed on the main shaft, the movable end tooth comprises a first meshing tooth, and the static end tooth comprises a second meshing tooth meshed with the first meshing tooth; the limiting piece is provided with a first position for limiting the rotation of the static end tooth and a second position for allowing the static end tooth and the movable end tooth to rotate synchronously.

Referring to fig. 1 and fig. 2, the impact mechanism 100 of the present embodiment includes a main shaft 1, a movable end tooth 2, a stationary end tooth 3, a limiting member 4, and a driving member 5. The movable end tooth 2 includes a first engaging tooth 21, and the stationary end tooth 31 includes a second engaging tooth 31 engaged with the first engaging tooth 21. The movable end teeth 2 are fixed on the main shaft 1 and can rotate synchronously with the main shaft 1, the limiting part 4 is used for limiting the rotation of the fixed end teeth 3, and the driving part 5 drives the limiting part 4 to move axially along the main shaft 1, so that the limiting part 4 is located at a first position and a second position. In other embodiments, the driving member may drive the limiting member to move in the radial direction, as long as the limiting member can be switched between the first position and the second position.

When the limiting piece 4 is located at the first position (see fig. 5), the fixed end tooth 3 is limited by the limiting piece 4 in a rotating manner, and when the movable end tooth 2 rotates along with the spindle, the first meshing tooth of the movable end tooth 2 continuously passes over the second meshing tooth 21 of the fixed end tooth 3 to realize rotation, so that small-amplitude impact action of the fixed end tooth 2 and the spindle 1 is realized; when the limiting piece 4 is located at the second position, the limiting piece 4 does not limit the static end tooth 3, and the movable end tooth 2 drives the static end tooth 3 meshed with the movable end tooth to synchronously rotate when rotating along with the main shaft. When the spindle 1 is not driven, the first meshing teeth 21 and the second meshing teeth 31 are always kept in a meshing state. That is, there is no axial displacement of the moving end teeth throughout.

Referring to fig. 3 to 5, the stationary end tooth 3 includes a plurality of notches 30 disposed along a circumferential direction thereof, the two limiting members 4 include two limiting protrusions 41, and when the limiting members 4 are located at the first position, the limiting protrusions 41 are engaged with the notches 30 to limit the stationary end tooth 3 in a rotating manner.

The driving part 5 is rotatably arranged on the bracket 6 and drives the limiting part 4 to move along the axial direction of the main shaft 1. The limiting piece 4 comprises a stress part 42 connected with the positioning protrusion 41; the driving member 5 has a force application portion 51 abutting against the force receiving portion 42 and is configured to transmit an operation force to the stopper member 4. The force application portion 51 has a thread groove 510 abutting against the force receiving portion 42, and the thread groove 510 drives the force receiving portion 42 (the limiting member 4) to move in the axial direction when rotating, so as to switch the first position and the second position of the limiting member 4. When the limiting member 4 is located at the first position, the movable end tooth 2 and the stationary end tooth 3 are located in a space surrounded by the limiting member 4.

The limiting protrusion 41 has an inclined surface 410 disposed at an angle with respect to the axial direction, and the inclined surface 410 plays a guiding role when the limiting member 4 is switched from the second position to the first position.

On the other hand, this application still provides a percussion drill, and it has drilling function and impact function concurrently. Referring to fig. 6, the impact drill of the present embodiment includes a housing 200, a motor (not shown) disposed in the housing, a transmission mechanism (not shown), and a battery pack 300 for supplying power to the motor, wherein the bracket 6 is fixed to the housing 200. The motor transmits power to the main shaft 1 through a transmission mechanism.

When the limiting piece 4 is located at the first position, the impact drill is in an impact mode; when the limiting piece 4 is located at the second position, the percussion drill is in a drilling mode or a torque adjusting mode, and the torque adjusting button 7 is arranged in front of the driving piece 5 and also rotatably assembled on the bracket 6, so that the operation of a user is facilitated.

The utility model provides an impact mechanism and impact drill, at the switching in-process of impact mode and drilling mode, only need adjust the position of locating part, and need not to move sound end tooth, are favorable to improving impact mechanism's reliability, also are favorable to simplifying the structure simultaneously.

Although the present application has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the application, and all changes, substitutions and alterations that fall within the spirit and scope of the application are to be understood as being covered by the following claims.

Claims (10)

1. An impact mechanism is used for an impact drill and is characterized by comprising a main shaft, a movable end tooth, a static end tooth, a limiting piece used for limiting the rotation of the static end tooth and a driving piece used for driving the limiting piece to move, wherein the movable end tooth is fixed on the main shaft, the movable end tooth comprises a first meshing tooth, and the static end tooth comprises a second meshing tooth meshed with the first meshing tooth;

the limiting piece is provided with a first position for limiting the rotation of the static end tooth and a second position for allowing the static end tooth and the movable end tooth to rotate synchronously.

2. The impact mechanism of claim 1, wherein said stationary end tooth includes a plurality of notches disposed circumferentially therealong, and said retainer includes a retaining protrusion; when the limiting piece is located at the first position, the limiting protrusion is matched with the notch to limit the rotation of the static end tooth.

3. The impact mechanism of claim 2, wherein said drive member is rotatably disposed to drive said stop member in axial movement along said main shaft.

4. The impact mechanism of claim 3, wherein said retainer comprises a force receiving portion connected to a positioning protrusion;

the driving piece is provided with a force application part abutting against the force bearing part and is configured to transmit operation force to the limiting piece.

5. The impact mechanism of claim 4, wherein said force applying portion has a helicoid surface that abuts said force receiving portion.

6. The impact mechanism of claim 1, wherein said limit projection has an inclined surface disposed at an angle with respect to an axial direction of said main shaft.

7. The impact mechanism of claim 1, wherein said first and second engagement teeth remain engaged at all times when said spindle is not being driven.

8. The impact mechanism of claim 1, wherein when the position-limiting member is located at the first position, the movable end tooth and the stationary end tooth are located in a space defined by the position-limiting member.

9. A percussion drill, comprising a housing, a motor disposed in the housing, and a percussion mechanism as claimed in any one of claims 1 to 8, the motor being configured to drive the percussion mechanism.

10. The hammer drill of claim 9, wherein the hammer drill is in a hammer mode when the stop is in the first position; and when the limiting piece is positioned at the second position, the impact drill is in a drilling mode.

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