CN221159783U

CN221159783U - Angle grinder

Info

Publication number: CN221159783U
Application number: CN202322686076.1U
Authority: CN
Inventors: 高军利
Original assignee: Jiangsu Dartek Technology Co Ltd
Current assignee: Jiangsu Dartek Technology Co Ltd
Priority date: 2023-10-08
Filing date: 2023-10-08
Publication date: 2024-06-18
Anticipated expiration: 2033-10-08

Abstract

The application relates to an angle grinder; it comprises the following steps: a housing; an output shaft at least partially disposed in the housing and configured to mount a work attachment; a motor disposed in the housing and driving the output shaft to rotate; the shield at least partially surrounds the output shaft and rotates with the output shaft as an axis; a bearing block connected to the housing and disposed around the output shaft; a base at least partially between the shroud and the bearing housing; the locking piece is connected inside the base in a sliding way; an elastic member which deforms after the shield is installed and has an acting force for pressing the locking member; a latch located on the bearing housing or the shroud and at least partially receiving the latch; the force required by the rotation of the shield in the direction consistent with the rotation of the output shaft is first rotational force, the force required by the rotation of the shield in the direction opposite to the rotation of the output shaft is second rotational force, and the first rotational force is far greater than the second rotational force, so that the effect of conveniently adjusting the shield is achieved.

Description

Angle grinder

Technical Field

The application relates to the technical field of electric tools, in particular to an angle grinder.

Background

The angle grinder is a portable electric tool for cutting or polishing, and is mainly used for cutting, polishing, brushing metal or stone, etc. With the development of angle grinders, angle grinders are equipped with shields for protection based on requirements of safety production specifications.

In the related art, as in the chinese patent with the application number CN200910183827X, an angle grinder is disclosed, which comprises a gear box, a rotor, a front rotor bearing, a rear rotor bearing, a bearing box, an output shaft bearing and a lock pin, wherein one end of the output shaft passes through the bearing box to be fixedly connected with a grinding wheel of the angle grinder, the other end of the output shaft is fixedly connected with a large gear, the large gear is meshed with a pinion fixed on a front rotor end shaft, a wind shield and a stator are connected to the outer side of the rear rotor bearing, and the wind shield and the stator are both sleeved on the rear rotor end shaft; elastic oil seals are respectively arranged between the front rotor bearing and the front rotor end shaft and between the output shaft bearing and the output shaft, O-shaped sealing rings are respectively sleeved on a lock pin of the gear box and an end cover opening of the bearing box, which is close to the gear box side, on the periphery of the rear rotor bearing, a bearing aluminum sleeve is sleeved, and a dust-proof ring is further arranged between the rear rotor bearing and the rear rotor end shaft.

However, the current shield is directly fixed on the casing, and when the cutting angle is adjusted, the shield is inconvenient to protect other angles, so that improvement is needed.

Disclosure of Invention

Based on the above, it is necessary to provide an angle grinder for solving the problem that the protection angle is inconvenient to adjust.

In order to solve the technical problems, the application is realized as follows:

in one embodiment, there is provided an angle grinder comprising: a housing;

An output shaft at least partially disposed in the housing and configured to mount a work attachment;

a motor disposed in the housing and driving the output shaft to rotate;

the shield at least partially surrounds the output shaft and rotates with the output shaft as an axis;

Further comprises:

a bearing block connected to the housing and disposed around the output shaft;

a base at least partially between the shroud and the bearing housing;

The locking piece is connected inside the base in a sliding way;

An elastic member which deforms after the shield is installed and has an acting force for pressing the locking member;

A latch located on the bearing housing or the shroud and at least partially receiving the latch;

The force required for rotation of the shield in a direction coincident with the rotation of the output shaft is a first rotational force, the force required for rotation of the shield in a direction opposite to the rotation of the output shaft is a second rotational force, and the first rotational force is substantially greater than the second rotational force.

Optionally, the latch member has a first guide portion and a second guide portion, when the shield receives the first rotational force, the first guide portion abuts against the inner wall of the latch portion, and when the shield receives the second rotational force, the second guide portion abuts against the inner wall of the latch portion.

Optionally, the latch part is provided with a first guide part matched with the first guide part and a second guide part matched with the second guide part, and an inclination angle of one of the first guide part and the first guide part is larger than an inclination angle of one of the second guide part and the second guide part.

Optionally, an angle of one of the first guide and the first guide is [35 °,75 ° ], and an angle of one of the second guide and the second guide is [10 °,45 ° ].

Optionally, an angle of one of the first guide and the first guide is [45 °,60 ° ], and an angle of one of the second guide and the second guide is [25 °,35 ° ].

Optionally, the elastic member is a spring, and the stiffness coefficient of the elastic member is [1N/mm,4N/mm ].

Optionally, the coefficient of friction between the latch and the latch is [0.15,0.55].

Optionally, at least 2 elastic members are provided along a circumferential direction of the output shaft.

Optionally, the guard shield center is provided with the mounting hole, the mounting hole inner wall is provided with the stopper towards the center, the bearing frame includes installation department and bearing portion, the one end that the installation department was kept away from to the bearing portion is provided with spacing edge of a wing, be provided with the breach that supplies the stopper to insert on the spacing edge of a wing.

Optionally, the one side that the bearing portion is located spacing edge of a wing and is close to installation department is provided with the slide that supplies the stopper to insert and establish, the mounting hole inner wall is provided with prevents slow-witted piece, be provided with on the spacing edge of a wing and prevent slow-witted slot, prevent slow-witted piece and stopper asymmetric setting.

In the embodiment of the application, the locking part driven by the elastic part is clamped into the locking part, so that the protective cover can conveniently drive the base to rotate on the bearing seat, and the protection angle can be conveniently adjusted.

Drawings

FIG. 1 is a schematic view showing an internal structure of an angle grinder according to an embodiment of the present application;

FIG. 2 is an exploded view of a shield structure according to an embodiment of the present application;

FIG. 3 is a schematic cross-sectional view illustrating an internal structure of a sliding chute according to an embodiment of the present application;

Fig. 4 is an exploded view of a shield structure in another embodiment of the present application.

Description of the drawings: 1. a housing; 11. an output shaft; 12. a motor; 13. a shield; 131. a mounting hole; 132. a limiting block; 133. fool-proof blocks; 2. a bearing seat; 21. a mounting part; 22. a bearing part; 221. limit flanges; 222. a notch; 223. fool-proof slot; 224. a slideway; 3. a base; 31. a slip groove; 32. a stop portion; 4. a latch; 41. a limit part; 42. a support part; 43. a first guide part; 44. a second guide part; 5. an elastic member; 6. a latch portion; 61. a first guide portion; 62. a second guide portion; 7. a support; 8. a tool attachment.

Description of the embodiments

In order that the above objects, features and advantages of the application will be readily understood, a more particular description of the application will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. The present application may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the application, whereby the application is not limited to the specific embodiments disclosed below.

In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Referring to fig. 1, fig. 1 shows a schematic internal structure of an angle grinder according to an embodiment of the present application, and the angle grinder provided by the embodiment of the present application includes a housing 1, an output shaft 11, a motor 12, a shield 13, a bearing seat 2, a base 3, a latch 4, an elastic member 5, and a latch 6. Wherein the output shaft 11 is at least partially arranged in the housing 1 and is used for mounting the tool attachment 8, and the motor 12 is arranged in the housing 1 and drives the output shaft 11 to rotate for driving the tool attachment 8 to operate. The shield 13 at least partially surrounds the tool attachment 8 after the output shaft 11 mounts the tool attachment 8 to provide a range of protection to the tool attachment 8.

Referring to fig. 1 and 2, fig. 2 shows an exploded view of a shield structure in an embodiment of the present application, a bearing housing 2 includes a mounting portion 21 and a bearing portion 22, the mounting portion 21 may be mounted on a housing 1 by bolts, the bearing portion 22 may be a cylindrical structure with two ends open, and one end may be integrally formed on the mounting portion 21; the bearing portion 22 may be provided around the output shaft 11. The base 3 may be at least partially located between the shield 13 and the mounting portion 21, and the base 3 may be connected to the shield 13 by a bolt, may be integrally formed with the shield 13, or may be integrally formed with the mounting portion 21.

Referring to fig. 2 and 3, fig. 3 is a schematic cross-sectional view showing an internal structure of a sliding groove in an embodiment of the present application, where the latch 4 may be slidably connected inside the base 3, the base 3 may be radially or axially provided with the sliding groove 31, and in an embodiment of the present application, the sliding groove 31 is preferably axially provided, and the latch 4 is slidably connected in the sliding groove 31 along the axial direction. The elastic element 5 can be pressed against the catch element 4, and after the shield 13 has been installed, the elastic element 5 can be deformed and can have a pressure against the catch element 4. The elastic member 5 may be a spring, a wave washer, or a leaf spring, as long as it can provide elastic force along the length direction of the sliding groove 31, and the embodiment of the present application is preferably a spring. The number of the elastic members 5 corresponding to each locking member 4 may be one or two, and in the embodiment of the present application, one elastic member is preferred.

The locking part 6 is connected to the bearing seat 2 or the shield 13, and the locking part 4 is clamped with the locking part 6 under the abutting pressure of the elastic part 5 and is at least partially received by the locking part 6. It will be appreciated that the latch 6 may be integrally formed on the housing 2 or the shield 13, or that the latch 6 may be mounted as a separate piece on the housing 2 or shield 13 for durability. For portability, the head housing and the bearing housing 2 may be made of aluminum alloy, but in view of frequent wear adjustment of the latch 6, the latch 6 may be made of a wear-resistant metal, such as a composite material of high manganese steel, wear-resistant alloy steel, etc., and fastened to the head housing by bolts.

Alternatively, a plurality of locking elements 4 are uniformly arranged along the circumference of the bearing portion 22, preferably four in the embodiment of the present application, and of course, those skilled in the art will understand that the number of locking elements 4 may be three, two, or even one or more. The plurality of locking parts 6 are uniformly distributed along the circumferential direction of the bearing seat 2, and the number of the locking parts 6 is larger than that of the locking pieces 4. In the embodiment of the application, the number of the locking parts 6 is preferably an integral multiple of the number of the locking parts 4, so that the shield 13 can be conveniently adjusted at all angles. Correspondingly, the number of the elastic pieces 5 is at least two, and in the embodiment of the application, the number of the elastic pieces corresponds to the number of the locking pieces 4.

Alternatively, the stiffness coefficient of the elastic member 5 is [1N/mm,4N/mm ], and the stiffness coefficient of the elastic member 5 in the embodiment of the present application is 2N/mm, when the stiffness coefficient of the elastic member 5 is too large, the shield 13 is not easy to rotate, and when the stiffness coefficient of the elastic member 5 is too small, the shield 13 is easy to rotate, which may cause a hazard. Of course, it is understood that the stiffness coefficient of the elastic member 5 may be 3N/mm, as will be appreciated by those skilled in the art.

Optionally, a limiting part 41 is disposed on a side of the latch member 4 facing away from the latch portion 6, and the limiting part 41 may be integrally formed with the latch member 4, or may be mounted on the latch member 4, and in this embodiment, the limiting part 41 is preferably integrally formed with the latch member 4. The inner wall of one end of the sliding groove 31, which is close to the locking part 6, is formed with a stop part 32, the size of a through hole formed by the stop part 32 may be greater than or equal to the size of the locking part 4, and meanwhile, the size of the limiting part 41 may be greater than the size of a through hole formed by the stop part 32, so that when the elastic part 5 abuts against the locking part 4 to move, the limiting part 41 can abut against the stop part 32, thereby limiting the position of the locking part 4.

Optionally, the support member 7 is disposed on one of the bearing seat 2 or the shield 13 away from the latch portion 6, and in this embodiment, the shield 13 is provided, and the support member 7 may be mounted on the shield 13 or may be integrally formed on the shield 13, and in this embodiment, the support member is preferably integrally formed on a surface of the shield 13 facing the base 3. The elastic member 5 is sleeved on the supporting member 7 or the supporting member 7 is sleeved on the elastic member 5, and in the embodiment of the application, the elastic member 5 is preferably sleeved on the supporting member 7, so that the stable expansion and contraction of the elastic member 5 are maintained.

Optionally, a supporting part 42 is arranged at one side of the locking piece 4 away from the locking part 6, the supporting part 42 can be in a rod shape, and the supporting part 42 can be installed on the locking piece 4 or can be integrally formed on the surface of the locking piece 4; the support 42 and the locking element 4 are preferably integrally formed. Each latch 4 may be provided with two support members 7, and each support member 7 may be sleeved with an elastic member 5. Of course, it will be appreciated that the support member 7 may also be sleeved on the elastic member 5, as will be appreciated by those skilled in the art.

Optionally, a mounting hole 131 is formed in the center of the shield 13, a limiting block 132 is formed on the inner wall of the mounting hole 131 towards the center of the mounting hole, and the limiting block 132 and the shield 13 can be integrally formed. The end of the bearing portion 22 away from the mounting portion 21 is provided with a limit flange 221, and the limit flange 221 may be mounted on the bearing portion 22 or may be integrally formed at the end of the bearing portion 22. The limiting flange 221 is provided with a notch 222, and the limiting block 132 can rotate along the circumferential direction of the bearing part 22 after moving along the radial direction of the bearing part 22 from the notch 222.

Optionally, the inner wall of the mounting hole 131 is convexly provided with a foolproof block 133, and the limiting flange 221 is provided with a foolproof slot 223, so that the foolproof block 133 and the limiting block 132 are asymmetrically arranged, and the shield 13 can be mounted on the bearing portion 22 only at one position.

Optionally, a slide 224 for inserting the stopper 132 is provided on a side of the bearing portion 22, which is located on the side of the limiting flange 221 near the mounting portion 21, and the stopper 132 may be inserted into the slide 224 to rotate along the circumferential direction of the bearing portion 22.

Referring to fig. 4, fig. 4 is an exploded view showing a structure at a shroud of an angle grinder according to an embodiment of the present application, optionally, a first guide portion 43 and a second guide portion 44 are formed on the latch 4, and a first guide portion 61 engaged with the first guide portion 43 and a second guide portion 62 engaged with the second guide portion 44 are formed on the latch 6. When the shield 13 receives the first rotational force to rotate in the direction coincident with the rotational direction of the output shaft 1, the first guide portion 43 abuts against the first guide portion 61. When the shield 13 is rotated in the direction opposite to the rotation direction of the output shaft 11 by the second rotational force, the second guide portion 44 abuts against the second guide portion 62. Wherein the first rotational force is substantially greater than the second rotational force such that the rotation of the shield 13 in a direction coincident with the direction of rotation of the output shaft 11 is more labor-efficient than a rotation in a direction opposite to the direction of rotation of the output shaft 11.

Further, the inclination angle of one of the first guide portion 43 and the first guide portion 61 is larger than the inclination angle of one of the second guide portion 44 and the second guide portion 62, and here, the inclination angle of the first guide portion 43 may be larger than the inclination angle of the second guide portion 44, or the inclination angle of the first guide portion 43 may be larger than the inclination angle of the second guide portion 62, or the inclination angle of the first guide portion 43 may be larger than the inclination angle of the second guide portion 44 and the second guide portion 62. In the embodiment of the present application, the inclination angles of the first guide portion 43 and the first guide portion 61 may be identical, and the inclination angles of the second guide portion 44 and the second guide portion 62 may be identical. In the embodiment of the present application, the inclination angle of the first guiding portion 43 is larger than that of the second guiding portion 44, and in particular, one of the second guiding portion 44 and the second guiding portion 62 may be a vertical surface, so that the force of rotating the shield 13 in the direction opposite to the rotation direction of the output shaft 11 is larger.

Further, the angle of one of the first guide portion 43 and the first guide portion 61 is [35 °,75 ° ], preferably, the angle of one of the first guide portion 43 and the first guide portion 61 is [45 °,60 ° ]; the angle of one of the second guide 44 and the second guide 62 is [10 °,45 ° ], preferably the angle of one of the second guide 44 and the second guide 62 is [25 °,35 ° ]. In the embodiment of the present application, the angle of the first guiding portion 43 is preferably 50 °, the angle of the second guiding portion 44 is preferably 30 °, and of course, the second guiding portion may also select any value in the range of 25 °,30 ° or 35 °, or [25 °,35 ° ], and the first guiding portion may also select any value in the range of 45 °,50 °,55 ° or 60 °, or [45 °,60 ° ], as long as the first rotational force is far greater than the second rotational force.

Alternatively, the friction coefficient between the latch 4 and the latch 6 is [0.15,0.55], where the friction coefficient may be the friction coefficient between the first guide 43 and the first guide 61, or the friction coefficient between the second guide 44 and the second guide 62. The coefficient of friction between the first guide portion 43 and the first guide portion 61 may be the same as the coefficient of friction between the second guide portion 44 and the second guide portion 62, or may be surface-treated so as to be different. In the embodiment of the present application, the coefficient of friction between the first guide portion 43 and the first guide portion 61 is the same as the coefficient of friction between the second guide portion 44 and the second guide portion 62, and is any value of 0.15,0.2,0.25,0.3,0.35,0.4,0.45,0.5 or any value of the [0.15,0.55] numerical range.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.

Claims

1. An angle grinder, comprising: a housing;

a motor disposed in the housing and driving the output shaft to rotate;

Characterized by further comprising:

a bearing block connected to the housing and disposed around the output shaft;

a base at least partially between the shroud and the bearing housing;

The locking piece is connected inside the base in a sliding way;

a latch located on the bearing housing or the shroud and at least partially receiving a latch;

The force required by the rotation of the shield in the direction consistent with the rotation of the output shaft is a first rotating force, the force required by the rotation of the shield in the direction opposite to the rotation of the output shaft is a second rotating force, and the first rotating force is far greater than the second rotating force;

The locking piece is provided with a first guide part and a second guide part, the locking part is provided with a first guide part matched with the first guide part and a second guide part matched with the second guide part, and the inclination angle of one of the first guide part and the first guide part is larger than that of one of the second guide part and the second guide part.

2. The angle grinder of claim 1, wherein the first guide portion abuts against the latch inner wall when the shield receives the first rotational force, and wherein the second guide portion abuts against the latch inner wall when the shield receives the second rotational force.

3. The angle grinder of claim 1, wherein an angle of one of the first guide and the first guide is [35 °,75 ° ], and an angle of one of the second guide and the second guide is [10 °,45 ° ].

4. The angle grinder of claim 1, wherein an angle of one of the first guide and the first guide is [45 °,60 ° ], and an angle of one of the second guide and the second guide is [25 °,35 ° ].

5. An angle grinder according to claim 1, wherein the resilient member is a spring having a stiffness coefficient of [1N/mm,4N/mm ].

6. The angle grinder of claim 1, wherein a coefficient of friction between the latch and the latch is [0.15,0.55].

7. An angle grinder according to claim 1, wherein at least 2 elastic members are provided in a circumferential direction of the output shaft.

8. The angle grinder of claim 1, wherein the shield is centrally provided with a mounting hole, a stopper is provided on an inner wall of the mounting hole toward the center, the bearing housing includes a mounting portion and a bearing portion, a stopper flange is provided on an end of the bearing portion away from the mounting portion, and a notch for inserting the stopper is provided on the stopper flange.

9. The angle grinder of claim 8, wherein a slide way for inserting the limiting block is arranged on one side of the bearing part, close to the mounting part, of the limiting flange, a fool-proof block is arranged on the inner wall of the mounting hole, a fool-proof slot is arranged on the limiting flange, and the fool-proof block and the limiting block are asymmetrically arranged.