A drill chuck

Abstract

The utility model provides a drill chuck belongs to drill chuck technical field. It solved the problem of low reliability of the existing drill chuck and drive shaft connection. The drill chuck, including the drill body that is tubular, the connecting hole that is passed through and can be crossed for screw is set up along the axial direction to the drill body, the mounting hole that can be crossed for drive shaft is set up to the one end of drill body, the mounting hole is communicated with the connecting hole, the end face of drill body is set up with a plurality of positioning slot that can be inserted and is communicated with the connecting hole for the boss of drive shaft, the positioning slot is set up along the axial direction of drill body and the opening faces outward, a plurality of positioning slots are distributed along the circumference. The drill chuck can realize prepositioning, can also realize the circumferential limit, has improved the reliability of drill body and drive shaft connection.

Description

Technical Field

[0001] This utility model belongs to the field of drill chuck technology and relates to a drill chuck. Background Technology

[0002] Modern electric drills require the drill bit to be mounted on a drill chuck. However, the drill bit and drill chuck are usually installed during use for easy carrying. After installation, the drill chuck needs to be positioned precisely. Therefore, the installation of the drill chuck and drill bit needs to achieve both quick installation and high precision.

[0003] Existing drill chucks, such as the Chinese patent application [Authorization Announcement No.: CN206539578U], disclose a screw and a drill chuck, including a housing and a chuck body installed in the housing. The front part of the drill chuck has a drill bit mounting cavity. The chuck body can be fixed to the drive shaft by a screw. After the chuck body is installed on the drive shaft, the concave surface of the screw head is located in the drill bit mounting cavity, and the center line of the concave surface is on the same straight line as the clamping center line of the drill chuck.

[0004] In the above structure, the chuck body is first installed on the drive shaft, and the chuck body is connected to the drive shaft by screws. However, during installation, the drive shaft is partially placed in the drive shaft mounting cavity. This requires the operator to press the drill chuck onto the drive shaft while simultaneously threading the screw through the drill mounting cavity to connect it to the drive shaft. An axial connection is achieved between the screw and the drive shaft, but the connection between the drill chuck and the drive shaft relies solely on the locking force of the screw, which affects the reliability of the connection between the drill chuck and the drive shaft. Utility Model Content

[0005] The purpose of this utility model is to address the aforementioned problems in the existing technology by proposing a drill chuck. The technical problem to be solved by this utility model is: how to solve the problem of low reliability of the connection between the existing drill chuck and the drive shaft.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] A drill chuck includes a cylindrical drill body with a through-hole for screws to pass through along its axial direction. One end of the drill body has a mounting hole for a drive shaft to pass through, and the mounting hole communicates with the through-hole. The drill body is characterized by having several positioning grooves on its end face for drive shafts to be embedded in and communicating with the through-hole. These positioning grooves are axially oriented and open outwards, and are distributed circumferentially.

[0008] To improve the circumferential limiting effect of the drill chuck and the drill bit's drive shaft, a positioning groove is provided on the end face of the drill body to facilitate the insertion of the drive shaft's protrusion, thus achieving circumferential limiting of the drive shaft. A screw is then inserted into the connecting hole, with its end passing through the connecting hole and threadedly connected to the drive shaft in the mounting hole, achieving axial positioning of the screw and the drive shaft. The protrusion of the drive shaft and the positioning groove on the drill body achieve circumferential limiting between the drive shaft and the drill body. Furthermore, the positioning groove is opened along the axial direction of the drill body with its opening facing downwards, so the drill body can be inserted axially into the mounting hole. This achieves both pre-positioning and circumferential limiting, improving the reliability of the connection between the drill body and the drive shaft.

[0009] In the aforementioned drill chuck, the positioning groove extends radially through the drill body, and the groove walls on both sides of the positioning groove are planar.

[0010] The positioning groove runs radially through the drill body, making the drill body easier to process and facilitating the quick insertion of the protrusion on the drive shaft. Furthermore, by adopting a planar design for the groove walls on both sides, the protruding sidewalls fit snugly against the groove walls on both sides of the positioning groove, improving the reliability of circumferential positioning.

[0011] In the aforementioned drill chuck, the mounting hole is a circular hole with a large-diameter section and a small-diameter section. The inner diameter of the large-diameter section is larger than the inner diameter of the small-diameter section, and the positioning groove is connected to the large-diameter section of the mounting hole.

[0012] By using the combination of the large-diameter section and the small-diameter section, the drive shaft can have its stroke limited by the difference in the inner diameter of the large-diameter section and the small-diameter section when it is installed in the mounting hole, thereby improving the stability of the drive shaft installation.

[0013] In the aforementioned drill chuck, a tapered guide positioning surface is provided between the large-diameter section and the small-diameter section of the mounting hole.

[0014] The guide positioning surface ensures that when the drive shaft is embedded in the mounting hole, in addition to the protrusion abutting against the positioning groove, the drive shaft also abuts against the guide positioning surface, thereby improving the axial pre-positioning effect of the drive shaft and thus improving the reliability of the connection between the drill chuck and the drive shaft.

[0015] In the aforementioned drill chuck, the bottom wall of the positioning groove is inclined from the outside inward toward the direction closer to the smaller diameter section.

[0016] The design of the bottom wall of the positioning groove increases the contact area between the positioning groove and the drive shaft, resulting in a better limiting effect and further improving the reliability of the connection between the drill chuck and the drive shaft.

[0017] In the aforementioned drill chuck, two positioning slots are provided, and the two positioning slots are symmetrically arranged along the radial direction of the drill body.

[0018] The number of positioning slots facilitates processing and also makes the circumferential limiting force of the drive shaft and drill body more uniform, resulting in a better circumferential limiting effect.

[0019] Compared with existing technologies, this drill chuck has the following advantages: the protrusion of the drive shaft and the positioning groove on the drill body realize the circumferential limitation between the drive shaft and the drill body. Furthermore, the positioning groove is opened along the axial direction of the drill body with the opening facing downwards. Therefore, the drill body can be inserted into the mounting hole along the axial direction, which can achieve both pre-positioning and circumferential limitation, thereby improving the reliability of the connection between the drill body and the drive shaft. Attached Figure Description

[0020] Figure 1 This is a bottom view of the present invention.

[0021] Figure 2 yes Figure 1 Sectional view of AA.

[0022] Figure 3 yes Figure 1 A cross-sectional view of BB.

[0023] In the diagram, 1 is the drill body; 11 is the connecting hole; 12 is the mounting hole; 12a is the large diameter section; 12b is the small diameter section; 12c is the guide positioning surface; and 13 is the positioning groove. Detailed Implementation

[0024] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0025] like Figure 2 As shown, this drill chuck includes a cylindrical drill body 1, which has a through-hole 11 along the axial direction through which a screw can pass.

[0026] Specifically, such as Figure 1 and Figure 2 As shown, one end of the drill body 1 is provided with a mounting hole 12 through which the drive shaft can pass. The mounting hole 12 is connected to the connecting hole 11. Several positioning grooves 13 are provided on the end face of the drill body 1, which are provided for the drive shaft to be inserted and are connected to the connecting hole 11. The mounting hole 12 and the connecting hole 11 are both connected to the positioning grooves 13. The positioning grooves 13 are opened along the axial direction of the drill body 1 and the openings face outwards. Several positioning grooves 13 are distributed circumferentially.

[0027] To improve the circumferential limiting effect of the drill chuck and the drill bit's drive shaft, a positioning groove 13 is provided on the end face of the drill body 1 to facilitate the insertion of the drive shaft's protrusion, thus achieving circumferential limiting of the drive shaft. A screw is then inserted into the connecting hole 11, and the end of the screw passes through the connecting hole 11 and is threadedly connected to the drive shaft in the mounting hole 12, achieving axial positioning of the screw and the drive shaft. The protrusion of the drive shaft and the positioning groove 13 on the drill body 1 achieve circumferential limiting between the drive shaft and the drill body 1. Furthermore, the positioning groove 13 is opened along the axial direction of the drill body 1 with its opening facing downwards, so the drill body 1 can be inserted into the mounting hole 12 along the axial direction. This achieves both pre-positioning and circumferential limiting, improving the reliability of the connection between the drill body 1 and the drive shaft.

[0028] like Figure 2 and Figure 3 As shown, the positioning groove 13 extends radially through the drill body 1. The groove walls on both sides of the positioning groove 13 are planar. The bottom wall of the positioning groove 13 is inclined from the outside to the inside towards the direction close to the small diameter section 12b. There are two positioning grooves 13, and the two positioning grooves 13 are symmetrically arranged radially along the drill body 1.

[0029] like Figure 2 and Figure 3 As shown, the mounting hole 12 is a circular hole with a large diameter section 12a and a small diameter section 12b. The inner diameter of the large diameter section 12a is larger than the inner diameter of the small diameter section 12b. The positioning groove 13 is connected to the large diameter section 12a of the mounting hole 12. A tapered guide positioning surface 12c is provided between the large diameter section 12a and the small diameter section 12b of the mounting hole 12.

[0030] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A drill chuck, comprising a cylindrical drill body (1), wherein the drill body (1) has an axially extending connecting hole (11) through which a screw can pass, and one end of the drill body (1) has a mounting hole (12) through which a drive shaft can pass, the mounting hole (12) communicating with the connecting hole (11), characterized in that, The end face of the drill body (1) is provided with a number of positioning grooves (13) into which the drive shaft can be inserted and which are connected to the connecting hole (11). The positioning grooves (13) are opened along the axial direction of the drill body (1) and the openings face outward. The number of positioning grooves (13) are distributed circumferentially.

2. The drill chuck according to claim 1, characterized in that, The positioning groove (13) extends radially through the drill body (1), and the groove walls on both sides of the positioning groove (13) are planar.

3. The drill chuck according to claim 1 or 2, characterized in that, The mounting hole (12) is a circular hole with a large diameter section (12a) and a small diameter section (12b). The inner diameter of the large diameter section (12a) is larger than the inner diameter of the small diameter section (12b). The positioning groove (13) is connected to the large diameter section (12a) of the mounting hole (12).

4. The drill chuck according to claim 3, characterized in that, The mounting hole (12) has a tapered guide positioning surface (12c) between the large diameter section (12a) and the small diameter section (12b).

5. The drill chuck according to claim 1 or 2, characterized in that, The bottom wall of the positioning groove (13) is inclined from the outside to the inside towards the small diameter section (12b).

6. The drill chuck according to claim 1 or 2, characterized in that, The positioning groove (13) is provided in two parts, and the two positioning grooves (13) are arranged symmetrically along the radial direction of the drill body (1).

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