CN220994311U

CN220994311U - Electric tool

Info

Publication number: CN220994311U
Application number: CN202322863391.7U
Authority: CN
Inventors: 潘曾强; 马奖; 刘琨
Original assignee: Jiangsu Dongcheng Tools Technology Co Ltd
Current assignee: Jiangsu Dongcheng Tools Technology Co Ltd
Priority date: 2023-10-24
Filing date: 2023-10-24
Publication date: 2024-05-24
Anticipated expiration: 2033-10-24

Abstract

The application provides an electric tool, which relates to the field of power tools and comprises: a first shell having a coupling opening extending in an axial direction at one end thereof; a second shell, one end of which is provided with a coupling head inserted in the coupling opening; the connecting assembly is used for connecting the connecting opening and the connecting head and comprises a rotation stopping piece, a first clamping piece and a second clamping piece which are positioned on two sides of the rotation stopping piece; wherein the rotation stopping piece is respectively clamped with the connecting opening and the connecting head to limit the relative circumferential rotation of the first shell and the second shell; the first clamping piece and the second clamping piece are respectively clamped on the connecting head or the connecting opening, and the first clamping piece and the second clamping piece are both abutted with the rotation stopping piece so as to limit the relative axial movement of the first shell and the second shell. By the arrangement, the replacement of the working heads with different sizes can be completed in a short time.

Description

Electric tool

Technical Field

The present application relates to the field of power tools, and in particular, to a detachable connection structure of a power tool.

Background

Power tools (e.g., power ratchet wrenches) are commonly used in automotive, industrial, and household applications to install and remove threaded fasteners and apply torque and/or angular displacement to a workpiece (e.g., a threaded fastener).

The gear case housing and the motor housing of the power tool are typically fastened to each other with screw fasteners; or one of the shells is provided with external threads, and the other shell is provided with internal threads for screw thread matching and fixing; however, the above connection method requires that the old screw or screw structure is completely unscrewed when the working head is replaced, and then the new screw or screw structure is screwed down again, which takes a long time.

Disclosure of utility model

Aiming at the defects of the prior art, the application aims to provide an electric tool which adopts a clamping connection structure and can directly release the connection of a clamping piece when a working head is replaced, and the electric tool is simple to operate and takes less time.

Therefore, the application provides the following technical scheme: a power tool comprising:

a first shell having a coupling opening extending in an axial direction at one end thereof;

A second shell, one end of which is provided with a coupling head inserted in the coupling opening;

The connecting assembly is used for connecting the connecting opening and the connecting head and comprises a rotation stopping piece, a first clamping piece and a second clamping piece which are positioned on two sides of the rotation stopping piece;

Wherein the rotation stopping piece is respectively clamped with the connecting opening and the connecting head to limit the relative circumferential rotation of the first shell and the second shell;

The first clamping piece and the second clamping piece are respectively clamped with the connecting head and the connecting opening, and the first clamping piece and the second clamping piece are abutted with the rotation stopping piece so as to limit the relative axial movement of the first shell and the second shell.

The further improvement scheme is as follows: the first clamping piece is clamped on the coupling head and abuts against the rotation stopping piece to limit the rotation stopping piece to axially move relative to the coupling head;

The second clamping piece is clamped in the connecting opening, and the inner diameter of the second clamping piece is smaller than the outer diameter of the rotation stopping piece so as to limit the second clamping piece to axially move relative to the rotation stopping piece.

The further improvement scheme is as follows: the rotation stopping piece is an annular gasket, and rotation stopping protrusions extend from the inner edge to the inner edge along the radial direction and from the outer edge along the radial direction;

the inner wall of the connecting opening is provided with a first rotation stopping groove along the axial direction;

The outer wall of the coupling head extends to form a second rotation stopping groove along the axial direction;

The rotation stopping protrusions are respectively clamped with the first rotation stopping grooves and the second rotation stopping grooves.

The further improvement scheme is as follows: the inner wall of the connecting opening is concavely provided with a first accommodating groove along the radial direction;

The second clamping piece is an outward expansion clamp spring and is arranged in the first accommodating groove, and the second clamping piece applies outward expansion biasing force to the first accommodating groove to clamp the connecting opening.

The further improvement scheme is as follows: the first receiving groove is proximate an edge of the coupling opening.

The further improvement scheme is as follows: the outer wall of the coupling head is concavely provided with a second accommodating groove along the radial direction;

The first clamping piece is an inward shrinking clamp spring and is sleeved in the second accommodating groove, and the first clamping piece applies inward shrinking biasing force to the second accommodating groove so as to clamp the coupling head.

The further improvement scheme is as follows: the inner wall of the coupling opening 11 has a stepped surface which contracts in the radial direction, with which the end face of the coupling head abuts.

A further development is that the first housing is internally provided with:

A ratchet ring swingably supported to the first housing;

A drive head rotatably supported by the ratchet ring, the drive head having an output head to output a working torque;

A pawl pivoted to the drive head and meshed with the ratchet ring for transmission;

the ratchet wheel is characterized by comprising a driving sleeve, wherein a fork opening is formed at one end of the ratchet wheel ring, and the driving sleeve is arranged in the fork opening.

A further development is that the second housing is internally provided with:

The eccentric shaft is rotatably supported on the second shell, one end of the eccentric shaft is inserted into the driving sleeve, and the other end of the eccentric shaft is meshed with the gear set;

the outer side of the gear set is meshed with the eccentric shaft for transmission, and the inner side of the gear set is meshed with a motor;

and an output shaft of the motor is meshed with the gear set to drive so as to provide a power source.

The further improvement scheme is as follows: the eccentric shaft is divided into a main shaft end part rotating around the axial direction of the eccentric shaft and an eccentric end part with eccentricity with the main shaft end part, the main shaft end part is meshed with the gear set, and the eccentric end part is in plug-in fit with the driving sleeve.

Compared with the prior art, the application has the following beneficial effects:

The application provides a power tool, which is formed by adopting a rotation stopping piece to match a first clamping piece and a second clamping piece to attach a first shell and an inner component thereof to a second shell and the inner component thereof. When the working head of the electric tool needs to be replaced, the limitation of the first shell and the second shell in the circumferential direction and the axial direction can be relieved only by inwards shrinking the second clamping piece clamped on the first shell, so that the working head is replaced. By the arrangement, the replacement of the working heads with different sizes can be completed in a short time.

Drawings

FIG. 1 is a schematic view of a power tool according to a preferred embodiment of the present application;

FIG. 2 is a schematic cross-sectional view of the power tool of FIG. 1;

FIG. 3 is an exploded view of the power tool of FIG. 1;

FIG. 4 is a schematic view, partially in section, of the power tool of FIG. 3;

FIG. 5 is a schematic view, partially in section, of the power tool of FIG. 2;

fig. 6 is a schematic cross-sectional view of the first housing of the power tool of fig. 3.

Detailed Description

The terminology used in the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. Words such as "upper", "lower", "front", "rear", etc., indicating an azimuth or a positional relationship are based on only the azimuth or the positional relationship shown in the drawings, and are merely for convenience of description and to simplify the description, and do not indicate or imply that the apparatus/elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present application.

The following describes specific embodiments of the present application with reference to the drawings.

As shown in fig. 1 and 2, the electric power tool 100 includes a first casing 10, a second casing 20, and a connection assembly 30 having a detachable structure that connects the two as one body.

For convenience of description, the power tool 100 is exemplified by a ratchet wrench; of course, the power tool 100 may be another type of tool, such as a tool that is inconvenient to replace by an output head or a transmission assembly, such as an angle impact wrench, and such a tool may employ the following disclosed embodiments.

As shown in fig. 1 and 2, the outer housing of the power tool 100 may be a generally "in-line" cylindrical structure that may be structurally divided into two sections: a first shell 10 and a second shell 20, the first shell 10 can be used as a head shell of a ratchet wrench in the embodiment shown in fig. 1, and the second shell 20 can be used as a handle shell of the ratchet wrench in the embodiment shown in fig. 1. Both may be of cylindrical construction, the first housing 10 being adapted to house an output device, the second housing 20 being adapted to house a motor 21 providing a power source, a gear set 22 for transmitting power to the output device and an eccentric shaft 23, wherein the eccentric shaft 23 is rotatable about a first axis 201.

For convenience and clarity in describing the technical solution of the present application, the following definitions are made: the direction of the first axis 201 and the direction parallel to the first axis 201 are defined as the axial direction, the radial direction of the circumferential direction about the first axis 201 is defined as the radial direction, the output direction along the motor 21 is defined as the upper direction, and the direction opposite to the upper direction is defined as the lower direction.

As shown in fig. 2 to 6, the lower end of the first case 10 has a coupling opening 11 extending in an axial direction, and the coupling opening 11 may be provided as a generally cylindrical cavity structure having an opening at a lower end, the cylindrical cavity being used to provide a receiving space for the insertion of the upper end of the second case 20, or may be a generally cylindrical cavity structure having an upper end of the second case 20, and the lower end of the first case 10 is inserted into the second case 20, although the cavity structure is not limited thereto, and the specific shape structure thereof depends on the shape structure of the junction of the first case 10 and the second case 20.

At the upper end of the first housing 10 is formed a support cavity for placing a ratchet ring 12 that can oscillate back and forth and a drive head 13 that can rotate continuously for a ratchet wrench. The ratchet ring 12 has a substantially circular ring-shaped structure with annular teeth on the inner wall thereof, and has a substantially semi-cylindrical concave fork formed at the lower end thereof, the fork being used for placing the driving sleeve 14, and the driving sleeve 14 is provided with a jack for mating with the eccentric shaft 23. The driving head 13 has a generally square output head 15 for outputting working torque in the radial direction, which directly or indirectly applies working torque to the outside to screw or unscrew workpieces such as bolts, a pawl 16 is pivotally connected to the driving head 13, both ends of the pawl 16 have teeth which mesh with annular teeth of the inner ring of the ratchet ring 12, and the ratchet ring 12 drives the driving head 13 to rotate in the radial direction through the pawl 16 when swinging back and forth.

As above, the size of the generally square output head 15, the ratio between the pawls 16 and the ratchet ring 12 of the different types of first housings 10 can be designed to be replaced with different specifications.

As shown in fig. 2-5, the second housing 20 is also a generally "in-line" cylindrical cavity structure with an open upper end and a closed lower end. A coupling head 21 inserted into the coupling opening 11 is formed at the upper end of the second housing 20, an eccentric shaft 23, a gear set 22 and a motor 21 are sequentially arranged in the second housing 20 from top to bottom, the power of the motor is transmitted to the eccentric shaft 23 through the gear set 22, the eccentric shaft 23 rotates around the first axis 201, and the eccentric shaft 23 extends into the first housing 10 to be inserted into the driving sleeve 14 so as to drive the ratchet ring 12 to swing back and forth. Wherein the eccentric shaft 23 is composed of a main shaft end 231 and an eccentric end 232, the central axis of the main shaft end 231 coincides with the first axis 201, and the central axis of the eccentric end 232 has eccentricity with the first axis 201. The lower end of the main shaft end 231 is in transmission connection with the gear set 22, the gear set 22 can be formed by a one-stage planetary gear set or even a plurality of stages planetary gear sets, the output shaft of the motor 21 firstly drives the gear set 22 to rotate, and then the gear set 22 drives the eccentric shaft 23 to rotate.

In the above, when the first casing 10 is replaced, the output torque and the output rotation speed of the ratchet wrench can be simultaneously adjusted by replacing the eccentric shafts 23 with different eccentricities and the gear sets 22 with different transmission ratios.

As shown in fig. 2-6, the connecting assembly 30 is a member for connecting the first shell 10 and the second shell 20 together, and for convenient and quick replacement of the first shell 10 with different specifications, the connecting assembly 30 is a detachable connecting member, which includes a rotation stopping member 31, and a first clamping member 32 and a second clamping member 33 located at two sides of the rotation stopping member 31.

To connect the first and second cases 10 and 20 together, both the circumferential rotation and the axial movement between the two cases need to be locked. The locking of the circumferential rotation is mainly realized by the rotation stopping piece 31 forming a clamping structure together with the coupling opening 11 and the coupling head 21. In the present application, the rotation stopping member 31 may be an annular gasket, the inner edge of the rotation stopping member 31 extends radially inward to form a rotation stopping protrusion 311, the outer edge of the rotation stopping member 31 extends radially outward to form a rotation stopping protrusion 311, the rotation stopping protrusion 311 may be a square bump, the inner wall of the coupling opening 11 may form a first rotation stopping groove 111 of a bar-shaped groove extending along the axial direction, the outer wall of the coupling head 21 may form a second rotation stopping groove 211 of the bar-shaped groove extending along the axial direction, the rotation stopping protrusion 311 located on the inner wall of the rotation stopping member 31 is clamped to the second rotation stopping groove 211, and the rotation stopping protrusion 311 located on the outer wall of the rotation stopping member 31 is clamped to the first rotation stopping groove 111, thereby the first shell 10 and the second shell 20 form a circumferential rotation locking structure. The rotation stop 31 may also be a rotation stop sleeve which engages with the coupling opening 11, the coupling head 21, respectively, to form a catch. Of course, the retaining structure formed by the rotation-stopping member 31, the coupling opening 11 and the coupling head 21 is not limited to this, and any retaining member formed by locking the coupling opening 11 and the coupling head 21 in any manner in the circumferential direction (when one of them rotates in the circumferential direction, the other is likely to be driven to rotate in the circumferential direction), which is the rotation-stopping member 31 that forms the retaining structure with the coupling opening 11 and the coupling head 21.

As shown in fig. 3 and 4, the locking of the first shell 10 and the second shell 20 moving in the axial direction is mainly achieved by an axial locking structure formed by a rotation stopping member 31, a first clamping member 32 clamped on the coupling head 21, and a second clamping member 33 clamped on the coupling opening 11. In the present application, the first clamping member 32 may be an shrink-fit snap spring, the outer wall of the coupling head 21 may be concavely provided with a second accommodating groove 212 along the radial direction, the first clamping member 32 is sleeved in the second accommodating groove 212 and applies an inward shrink biasing force to the inner wall of the second accommodating groove, so that the first clamping member 32 is clamped on the outer periphery of the coupling head 21, the lower end surface of the first clamping member 32 abuts against the upper end surface of the rotation stopping member 31, and therefore the rotation stopping member 31 is limited in the axial direction and cannot move up or down in the axial direction of the outer periphery of the coupling head 21. In the present application, the second clamping member 33 may be an expanding clamp spring, the inner wall of the coupling opening 11 may be concavely provided with the first accommodating groove 112 along the radial direction, the second clamping member 33 is disposed in the first accommodating groove 112 and exerts a biasing force expanding outwards on the inner wall thereof, in this way, the second clamping member 33 is clamped on the inner wall of the coupling opening 11, the upper end surface of the second clamping member 33 abuts against the lower end surface of the rotation stopping member 31, and the inner diameter of the second clamping member 33 is smaller than the outer diameter of the rotation stopping member 31, thereby the second clamping member 33 together with the coupling opening 11 is limited in the axial direction and cannot move upwards in the peripheral axial direction of the coupling head 21. The inner wall of the coupling opening 11 has a stepped surface 113 that contracts in the radial direction, and the upper end surface of the coupling head 21 abuts against the stepped surface 113, whereby the coupling opening 11 is restrained in the axial direction and cannot move down in the axial direction of the outer periphery of the coupling head 21. Whereby the first and second shells 10, 20 form an axially movable locking structure. Of course, the first clamping member 32 and the second clamping member 33 are not limited to the above-mentioned clamping members for clamping the coupling head 21 or the coupling opening 11, and are used for respectively applying a biasing force to the coupling head 21 and the coupling opening 11 in any form to form a clamping structure.

In the present application, the above-mentioned connection assemblies 30 are all disposed in the gaps between the first shell 10 and the second shell 20 at the plugging position, and the axial lengths of the two are not additionally increased, so that the structure is compact. And the gasket for stopping rotation and the clamping spring for clamping are common accessories, and the replacement cost is lower when the gasket is damaged or fatigue deformation needs replacement.

The ratchet wrench of the application is assembled and disassembled as follows:

When the first shell 10 is assembled to the second shell 20 for the first time, the second clamping piece 33 and the rotation stopping piece 31 are sequentially sleeved on the periphery of the coupling head 21, wherein the inner diameter of the second clamping piece 33 is larger than the outer diameter of the coupling head 21 and smaller than the outer diameter of the rotation stopping piece 31, the rotation stopping protrusions 311 of the rotation stopping piece 31 are clamped in the first rotation stopping groove 111 and the second rotation stopping groove 211, the first clamping piece 32 is tightly attached to the upper end face of the rotation stopping piece 31 and clamped in the second accommodating groove 212, finally the eccentric end 232 of the eccentric shaft 23 is aligned with the insertion hole of the driving sleeve 14 and inserted, and then the second clamping piece 33 is clamped in the first accommodating groove 112, so that the first shell 10 can be assembled to the second shell 20.

When the first casing 10 is replaced and needs to be disassembled, the first casing 10 is directly pulled out after the second clamping piece 33 is pulled out of the first accommodating groove 112. In the application, the replacement of the first shell can be completed only by disassembling the second clamping piece 33, and the corresponding first shell can be replaced more quickly according to threaded fasteners with different sizes.

In order to facilitate the disassembly of the second clamping member 33, the first accommodating groove 112 is disposed proximate to the lower edge of the coupling opening 11, so that the tip pliers can disassemble the expanding snap spring more conveniently to replace the first shell 10 quickly.

The present application is not limited to the above-described embodiments. Those of ordinary skill in the art will readily appreciate that many alternatives to the dual speed ratchet wrench of the present application are possible without departing from the spirit and scope of the present application. The protection scope of the present application is subject to the claims.

Claims

1. An electric tool, comprising:

2. The power tool of claim 1, wherein:

The first clamping piece is clamped on the coupling head and abuts against the rotation stopping piece to limit the rotation stopping piece to axially move relative to the coupling head;

3. The power tool of claim 2, wherein:

the rotation stopping piece is an annular gasket, and rotation stopping protrusions extend from the inner edge to the inner edge along the radial direction and from the outer edge along the radial direction;

4. The power tool of claim 2, wherein:

The inner wall of the connecting opening is concavely provided with a first accommodating groove along the radial direction;

5. The power tool of claim 4, wherein: the first receiving groove is proximate an edge of the coupling opening.

6. The power tool of claim 2, wherein:

the outer wall of the coupling head is concavely provided with a second accommodating groove along the radial direction;

7. The power tool of claim 2, wherein: the inner wall of the coupling opening has a stepped surface that contracts in the radial direction, and the end surface of the coupling head abuts against the stepped surface.

8. The power tool according to claim 1, wherein the first housing is internally provided with:

A ratchet ring swingably supported to the first housing;

9. The power tool according to claim 8, wherein the second housing is internally provided with:

10. The power tool according to claim 9, wherein the eccentric shaft is divided into a main shaft end portion rotating around the axial direction of the eccentric shaft end portion, and an eccentric end portion having an eccentricity with the main shaft end portion, the main shaft end portion being engaged with the gear set, and the eccentric end portion being in a socket-and-spigot fit with the driving sleeve.