CN221736000U - Locking assembly for screwdriver bit and electric tool - Google Patents

Abstract

The present utility model relates to a locking assembly for a driver bit for a power tool, the locking assembly comprising: the steel ball is used for being inserted into an output shaft of the electric tool; the locking sleeve is used for sleeving the outer side of the output shaft; the positioning pin is used for penetrating and connecting with the output shaft; the elastic piece and the gasket are used for sleeving the output shaft and clamping the end part of the positioning pin, and the gasket can limit the positioning pin to move along the axial direction of the gasket; the first end of the elastic piece is used for being connected with the locking sleeve, and the second end of the elastic piece is used for being connected with the gasket; when the locking sleeve and the gasket rotate along with the output shaft, the two ends of the elastic piece rotate along with the output shaft. According to the locking assembly disclosed by the utility model, the locking sleeve, the gasket and the elastic piece can synchronously rotate along with the output shaft, so that the abrasion of the elastic piece can be reduced or avoided, the service life of the elastic piece is prolonged, the positioning pin is limited to axially move along the self through the gasket, and the collision between the positioning pin and the clutch head shell is avoided.

Description

Locking assembly for screwdriver bit and power tool

Technical Field

The utility model relates to the technical field of electric screwdrivers, in particular to a locking assembly for a screwdriver head and an electric tool.

Background Art

Electric screwdrivers, also known as electric screwdrivers or electric screwdrivers or electric screwdrivers or electric torque screwdrivers, use a motor to drive the output shaft to drive the screwdriver head to rotate to tighten or loosen the screws. The screwdriver head is usually fixed to the output shaft through a locking assembly. The locking assembly mainly includes a locking sleeve, a locking spring, a positioning pin and a steel ball. The locking sleeve is installed on the output shaft. The locking steel ball is embedded in the through hole of the output shaft and rests on the circumference of the screwdriver head. The positioning pin is inserted on the output shaft and is used to limit the insertion position in the output shaft. One end of the locking spring rests on the clutch head shell of the electric screwdriver, and the other end rests on the locking sleeve. In this way, when the output shaft rotates, the locking sleeve will rotate with the output shaft, while the clutch head shell does not rotate. The end of the locking spring that is against the clutch head shell is stationary, and the other end of the locking spring and the locking sleeve generate friction, which easily leads to wear of the locking spring and reduces its service life. In addition, the positioning pin is prone to loosening under long-term vibration, which causes product collision and friction between the positioning pin and the clutch head shell.

Utility Model Content

Based on the above-mentioned defects in the prior art, the purpose of the utility model is to provide a locking assembly for a screwdriver head, in which the locking sleeve, locating pin, gasket and elastic part can rotate synchronously with the output shaft, thereby reducing or avoiding the wear of the elastic part and extending the service life of the elastic part. In addition, the locating pin is limited to move along its own axial direction by the gasket, thereby avoiding collision between the locating pin and the clutch head shell.

To this end, the utility model provides the following technical solutions.

The utility model provides a locking assembly for a screwdriver head, wherein the screwdriver head is used for an electric tool, and the locking assembly comprises:

A steel ball, which is used to be inserted into the output shaft of the electric tool;

A locking sleeve, which is used to be sleeved on the outer side of the output shaft;

A positioning pin, which is used to penetrate and connect to the output shaft;

An elastic member and a gasket, wherein the gasket is used to be sleeved on the output shaft and clamped on the end of the positioning pin, and the gasket can limit the positioning pin from moving along its own axial direction; the first end of the elastic member is used to be connected to the locking sleeve, and the second end is used to be connected to the gasket; when the locking sleeve and the gasket rotate together with the output shaft, the two ends of the elastic member rotate together.

Preferably, the locking assembly comprises a gasket, which is respectively connected to the positioning pin and the second end.

Preferably, the gasket is used to be sleeved on the output shaft and clamped on the end of the positioning pin to limit the positioning pin from moving along its own axial direction.

Preferably, when the steel ball is inserted into the output shaft, the steel ball partially protrudes from the outer wall of the output shaft.

Preferably, the inner wall of the locking sleeve comprises:

A first inner surface, which is used to press against the outer wall of the output shaft;

The second inner surface is used to press against the steel ball, and the diameter of the second inner surface is greater than the diameter of the first inner surface.

Preferably, the first inner surface is located between the second inner surface and the elastic member, and a notch is provided at one end of the locking sleeve facing the elastic member, the notch matches the steel balls one by one, and the notch is used for the steel balls to pass through to abut against the second inner surface.

Preferably, the locking sleeve is provided with a boss, which is used to be axially opposite to the outer end surface of the output shaft;

The inner wall of the locking sleeve further includes a third inner surface. The first inner surface, the second inner surface and the third inner surface are arranged in sequence. The diameter of the third inner surface is greater than the diameter of the second inner surface.

Preferably, the locking assembly comprises a clamping ring, one end of which is used to clamp onto the outer wall of the output shaft; the inner wall of the locking sleeve is provided with a step surface, and the other end of the clamping ring abuts against the step surface.

Preferably, the elastic member is a spring.

The utility model also provides an electric tool, comprising an output shaft and the locking assembly as described above.

The utility model has the following technical effects:

The utility model provides a locking assembly, which optimizes the assembly of elastic parts so that the locking sleeve, the positioning pin, the gasket and the elastic part can rotate synchronously with the output shaft, thereby reducing or avoiding the wear of the elastic part and extending the service life of the elastic part. In addition, the positioning pin is restricted from moving along its own axial direction by the gasket, so as to avoid collision between the positioning pin and the clutch head shell.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the three-dimensional structure of the electric tool of the present utility model;

FIG2 is a cross-sectional view of the structure of the electric tool of the present utility model;

FIG3 is a structural cross-sectional view of a locking sleeve of the present invention;

FIG4 is an enlarged cross-sectional view of the structure of the electric tool of the present utility model;

FIG5 is an exploded view of the structure of the locking assembly of the present invention;

FIG6 is a schematic diagram of the three-dimensional structure of the locking sleeve of the utility model;

FIG. 7 is a schematic diagram of the three-dimensional structure of the output shaft of the utility model.

Description of Reference Numerals

100. Power tools;

1. Locking assembly; 11. Steel ball; 12. Locking sleeve; 121. First inner surface; 122. Second inner surface; 123. Notch; 124. Third inner surface; 125. Boss; 126. Step surface; 13. Positioning pin; 14. Elastic member; 15. Gasket; 16. Clamp;

2. output shaft; 21. axial through hole; 22. first through hole; 23. second through hole;

3. Clutch head housing.

DETAILED DESCRIPTION

In order to make the technical solution and beneficial effects of the present invention more obvious and easy to understand, the following is a detailed description by listing specific embodiments. Unless otherwise defined, the technical and scientific terms used in this article have the same meaning as those in the technical field to which this application belongs.

In the description of the present invention, unless otherwise explicitly defined, terms such as “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “height”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of simplified description of the present invention, and do not indicate that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and should not be understood as a limitation on the present invention.

In the present invention, the terms "first" and "second" are used only for the purpose of clear description and cannot be understood as the relative importance of the indicated features or the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly include at least one of the features. In the description of the present invention, "multiple" means at least two; "several" means at least one, unless otherwise clearly defined.

In the present invention, unless otherwise clearly defined, the terms "install", "connect", "connect", "fix", "set", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral molding; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

In the present utility model, unless otherwise clearly defined, a first feature being “on”, “above”, “above”, “below”, “below”, “below” or “below” a second feature may mean that the first feature is in direct contact with the second feature, or the first feature and the second feature are in indirect contact with each other through an intermediate medium. Moreover, a first feature being “on”, “above” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than the horizontal height of the second feature. A first feature being “below”, “below” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the horizontal height of the first feature is lower than the horizontal height of the second feature.

The electric tool of the present utility model is described in detail below with reference to FIGS. 1 to 7 .

In this embodiment, as shown in Figures 1 and 2, the power tool 100 includes a locking assembly 1 and an output shaft 2. The output shaft 2 is a hollow structure and is provided with an axial through hole 21. When assembling a screwdriver head, one end of the screwdriver head is first inserted into the axial through hole 21, and then the screwdriver head is locked on the output shaft 2 by locking the locking assembly 1. In this way, the output shaft 2 can drive the screwdriver head to rotate, and the screwdriver head is rotated to tighten or loosen the screw.

As shown in Fig. 2, Fig. 4, Fig. 5 and Fig. 7, the locking assembly 1 comprises a steel ball 11, a locking sleeve 12, a positioning pin 13, an elastic member 14 and a gasket 15. The shaft of the output shaft 2 is provided with a first through hole 22 and a second through hole 23. The steel ball 11 is inserted into the first through hole 22 of the output shaft 2. The steel ball 11 is used to radially compress the screwdriver head inserted into the output shaft 2. The locking sleeve 12 passes through and is inserted into the second through hole 23 of the output shaft 2 to prevent the steel ball 11 from detaching from the output shaft 2. The positioning pin 13 is used to abut against the end of one end of the screwdriver head to limit the insertion depth of the screwdriver head. The gasket 15 is sleeved on the output shaft 2 and clamped on the end of the positioning pin 13. Sleeving the gasket 15 on the output shaft 2 is conducive to the rotation of the gasket 15 along with the output shaft 2. In addition, the electric tool 100 includes a clutch head shell 3, and the output shaft 2 is located inside the clutch head shell 3. Moreover, in order to facilitate the miniaturized design of the electric tool 100, the gap between the output shaft 2 and the clutch head shell 3 cannot be too large. In this solution, the end of the positioning pin 13 is clamped by a gasket 15. In this way, the positioning pin 13 can be limited from moving along its own axial direction, thereby preventing the positioning pin 13 from colliding with the clutch head shell 3 of the electric tool 100 after moving.

As shown in Fig. 2 and Fig. 4, the first end of the elastic member 14 is connected to the locking sleeve 12, and the second end is connected to the gasket 15 (for example, the two are in contact with each other), and the elastic member 14 is used to axially contact the locking sleeve 12. Specifically, since the outer wall of the positioning pin 13 is usually relatively smooth, and the positioning pin 13 is cylindrical, if the elastic member 14 directly contacts the positioning pin 13, the second end of the elastic member 14 is easy to slide, resulting in unstable contact between the two. By providing the gasket 15 and contacting the elastic member 14 against the gasket 15, the assembly of the elastic member 14 can be simplified, and the gasket 15 has a simple structure and is easy to assemble.

When the locking sleeve 12 and the positioning pin 13 rotate together with the output shaft 2, the first end of the elastic member 14 rotates together with the locking sleeve 12, and the second end rotates together with the gasket 15. In this way, both ends of the elastic member 14 rotate together, that is, the locking sleeve 12, the positioning pin 13, the gasket 15 and the elastic member 14 can all rotate synchronously with the output shaft 2.

By adopting the above technical solution and optimizing the assembly of the elastic member 14, the locking sleeve 12, the positioning pin 13, the gasket 15 and the elastic member 14 can all rotate synchronously with the output shaft 2, thereby reducing or avoiding the wear of the elastic member 14 and extending the service life of the elastic member 14. In addition, by clamping the end of the positioning pin 13 with the gasket 15, the positioning pin 13 can be restricted from moving along its own axial direction, thereby avoiding the positioning pin 13 from colliding with the clutch head shell 3 of the electric tool 100 after moving.

In one embodiment, as shown in FIG. 4 and FIG. 5 , the elastic member 14 is a spring, and the elastic member 14 is sleeved on the outer circumference of the output shaft 2 .

In one embodiment, as shown in Figures 4 and 5, the number of the steel balls 11 is two and they are symmetrically arranged, which is conducive to locking the screwdriver head. Of course, the number of the steel balls 11 is not limited to two, and can also be one, three, four or even more.

In one embodiment, as shown in FIG. 4 , the steel ball 11 partially protrudes from the outer wall of the output shaft 2 , so that the locking sleeve 12 can contact the steel ball 11 , and the steel ball 11 can be pressed by the locking sleeve 12 , so that the steel ball 11 can better press the screwdriver head to ensure that the screwdriver head is installed firmly.

Further, as shown in Figures 3 to 6, the inner wall of the locking sleeve 12 includes a first inner surface 121 and a second inner surface 122, the first inner surface 121 is pressed against the outer wall of the output shaft 2, and the second inner surface 122 is pressed against the steel ball 11. Since the steel ball 11 partially protrudes from the outer wall of the output shaft 2, by limiting the diameter of the second inner surface 122 to be larger than the diameter of the first inner surface 121, the locking sleeve 12 can press the steel ball 11 while ensuring that the locking sleeve 12 and the output shaft 2 are assembled and fastened.

Further, as shown in Fig. 3 to Fig. 6, the first inner surface 121 is located between the second inner surface 122 and the elastic member 14, and a notch 123 is provided at one end of the locking sleeve 12 facing the elastic member 14, and the notch 123 matches the steel ball 11 one by one. Specifically, when assembling the locking assembly 1, the steel ball 11 can be assembled into the second through hole 23 of the output shaft 2 first, and then the locking sleeve 12 is assembled. When assembling the locking sleeve 12, since the steel ball 11 partially protrudes from the outer wall of the output shaft 2, the notch 123 is used for the steel ball 11 to pass through the first inner surface 121 with a relatively small diameter and then abut against the second inner surface 122, so as to avoid the first inner surface 121 and the protruding part of the steel ball 11 abutting against each other axially and getting stuck, thereby hindering the assembly of the locking sleeve 12.

Further, as shown in Fig. 3 and Fig. 4, the locking sleeve 12 is provided with a boss 125, which is used to be axially opposite to the outer end face of the output shaft 2, and the inner wall of the locking sleeve 12 also includes a third inner surface 124. The first inner surface 121, the second inner surface 122 and the third inner surface 124 are arranged in sequence, and the diameter of the third inner surface 124 is greater than the diameter of the second inner surface 122. In this way, when assembling the locking sleeve 12, the locking sleeve 12 can be first pushed inward until the boss 125 and the outer end face of the output shaft 2 are against each other. At this time, the steel ball 11 and the third inner surface 124 are opposite to each other and the two are not in contact, and then the locking sleeve 12 is pulled outward until the second inner surface 122 radially presses the steel ball 11. This solution can reduce the assembly difficulty and assembly accuracy requirements of the locking sleeve 12 by providing the boss 125 and the third inner surface 124.

Furthermore, as shown in Figures 4 and 5, the locking assembly 1 includes a clamping ring 16, and the inner wall of the locking sleeve 12 is provided with a step surface 126. One end of the clamping ring 16 is clamped to the outer wall of the output shaft 2, and the other end of the clamping ring 16 abuts against the step surface 126 to improve the tightness of the assembly of the locking sleeve 12 and the output shaft 2.

It should be understood that the above embodiments are exemplary and are not intended to include all possible implementations included in the claims. Various modifications and changes may be made on the basis of the above embodiments without departing from the scope of the present disclosure. Similarly, the various technical features of the above embodiments may be arbitrarily combined to form other embodiments of the utility model that may not be explicitly described. Therefore, the above embodiments only express several implementations of the utility model and do not limit the scope of protection of the utility model patent.

Claims (8)

1. A locking assembly for a screwdriver bit, the screwdriver bit being used for an electric tool, characterized in that the locking assembly (1) comprises: A steel ball (11) for being inserted into the output shaft (2) of the electric tool; A locking sleeve (12) for sleeve-engaging the outer side of the output shaft (2); A positioning pin (13), which is used to penetrate and be connected to the output shaft (2); An elastic member (14) and a gasket (15), wherein the gasket (15) is used for being sleeved on the output shaft (2) and clamped on the end of the positioning pin (13), and the gasket (15) can limit the positioning pin (13) from moving along its own axial direction; the first end of the elastic member (14) is used for connecting to the locking sleeve (12), and the second end is used for connecting to the gasket (15); when the locking sleeve (12) and the gasket (15) rotate together with the output shaft (2), the two ends of the elastic member (14) rotate together. 2. The locking assembly for a screwdriver bit according to claim 1, characterized in that when the steel ball (11) is inserted into the output shaft (2), the steel ball (11) partially protrudes from the outer wall of the output shaft (2). 3. The locking assembly for a screwdriver bit according to claim 2, characterized in that the inner wall of the locking sleeve (12) comprises: A first inner surface (121) for pressing against the outer wall of the output shaft (2); The second inner surface (122) is used to press against the steel ball (11); the diameter of the second inner surface (122) is greater than the diameter of the first inner surface (121). 4. The locking assembly for a screwdriver bit according to claim 3 is characterized in that the first inner surface (121) is located between the second inner surface (122) and the elastic member (14), and a notch (123) is provided at one end of the locking sleeve (12) facing the elastic member (14), and the notch (123) matches the steel ball (11) one by one, and the notch (123) is used for the steel ball (11) to pass through so as to abut against the second inner surface (122). 5. The locking assembly for a screwdriver bit according to claim 4, characterized in that the locking sleeve (12) is provided with a boss (125) which is used to be axially opposite to the outer end surface of the output shaft (2); The inner wall of the locking sleeve (12) further comprises a third inner surface (124); the first inner surface (121), the second inner surface (122) and the third inner surface (124) are arranged in sequence; and the diameter of the third inner surface (124) is greater than the diameter of the second inner surface (122). 6. The locking assembly for a screwdriver bit according to claim 4 is characterized in that the locking assembly (1) comprises a clamping ring (16), one end of which is used to clamp onto the outer wall of the output shaft (2); the inner wall of the locking sleeve (12) is provided with a step surface (126), and the other end of the clamping ring (16) abuts against the step surface (126). 7. The locking assembly for a screwdriver bit according to any one of claims 1 to 6, characterized in that the elastic member (14) is a spring. 8. An electric tool, characterized in that it comprises an output shaft (2) and a locking assembly (1) according to any one of claims 1 to 7.