Electric grinding tool with vibration reduction structure

Abstract

The utility model discloses an electric grinding tool with a vibration reduction structure, and relates to the technical field of electric tools. According to the technical scheme, the two ends of the output shaft are sleeved with first bearings, axle boxes are arranged on the outer sides of the first bearings, a plurality of first annular grooves are formed in the axle boxes, first rubber rings are embedded in the first annular grooves, and the first bearings are sleeved with the first rubber rings. The electric grinder has the advantages that under the condition that the machining difficulty of the output shaft is not increased, vibration isolation or vibration absorption structures or parts are additionally arranged in the vibration transmission process, the vibration amplitude of the handheld position of the electric grinder is reduced, the use hand feeling of the electric grinder is improved, and the product competitiveness is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electric tools, in particular to an electric grinding tool with a vibration reduction structure. Background Art

[0002] When using an existing small electric grinder, due to the high-speed operation of the built-in drive motor, a vibration is obviously felt when holding it. The strong vibration generated during grinding will damage the drive motor and the internal circuit of the electric grinder, affecting the life of the entire machine; secondly, it will cause numbness to the user's palm.

[0003] The existing methods of controlling vibration in electric grinders mainly include: improving the positioning accuracy of rotating parts, corresponding design of protective sleeves, and material selection, etc. However, excessively improving the installation accuracy of the output shaft will increase production costs, and the use of protective sleeves will also cause material waste due to wear resistance. Utility Model Content

[0004] In view of the deficiencies in the prior art, the purpose of the utility model is to provide an electric grinding tool with a vibration reduction structure, which is used to improve the problem of numbness in the hands of users caused by mechanism vibration when using electric grinding products.

[0005] The above-mentioned purpose of the utility model is achieved through the following technical solutions:

[0006] An electric grinding tool with a vibration reduction structure comprises an output shaft and an electric grinder, wherein a rotor core shaft is inserted into the electric grinder, the rotor core shaft is fixed by the electric grinder and an intermediate cover, and the rotor core shaft is rotatable, the output shaft and the rotor core shaft are connected by a connecting sleeve, first bearings are sleeved on the outer sides of both ends of the output shaft, an axle box is provided on the outer side of the first bearing, a plurality of first annular grooves are opened in the axle box, a first rubber ring is embedded in the first annular groove, and the first rubber ring is sleeved on the first bearing.

[0007] In a preferred example, the utility model can be further configured as follows: the axle box and the middle cover are connected by screws, and a second annular groove is provided on the side of the axle box close to the middle cover, a second rubber ring is provided at the second annular groove, and the second rubber ring is sleeved on the middle cover.

[0008] In a preferred example, the utility model can be further configured as follows: a second bearing is sleeved on the rotor shaft core, an outer ring of the second bearing is fitted to the middle cover, a third annular groove is opened on the middle cover, a third rubber ring is embedded in the third annular groove, and the third rubber ring is sleeved on the second bearing.

[0009] In a preferred example, the utility model can be further configured as follows: a protective sleeve is provided on the outer side of the axle box.

[0010] In a preferred example, the utility model can be further configured as follows: a plurality of fourth grooves are opened on the outer side of the axle box, a plurality of rubber strips are embedded in the fourth grooves, and the rubber strips are located between the fourth grooves and the protective sleeve.

[0011] In summary, the present invention includes at least one of the following beneficial technical effects:

[0012] Without increasing the difficulty of processing the output shaft, adding vibration isolation or vibration absorption structures or parts during the vibration transmission process will not only not increase the extra cost, but also effectively improve the feel of the electric grinding tool. Specifically:

[0013] 1. By providing the first rubber ring and utilizing the deformation characteristics of the rubber ring, a part of the vibration from the output shaft can be absorbed;

[0014] 2. By setting the second rubber ring, the vibration between the output shaft and the axle box can be reduced; in addition, the vibration between the output shaft and the housing can also be reduced;

[0015] 3. By setting the third rubber ring, the influence of motor vibration on the axle box can be reduced;

[0016] 4. The rubber strips are arranged to absorb the vibration of the axle box and reduce the vibration amplitude of the hand-held part of the protective cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the internal structure of this technical solution.

[0018] Figure numerals: 1, output shaft; 2, electric grinder; 3, stator; 4, rotor; 5, rotor core shaft; 6, intermediate cover; 7, connecting sleeve; 8, first bearing; 9, axle box; 10, first annular groove; 11, first rubber ring; 12, second annular groove; 13, second rubber ring; 14, second bearing; 15, third annular groove; 16, third rubber ring; 17, protective sleeve; 18, fourth groove; 19, rubber strip. DETAILED DESCRIPTION

[0019] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0020] like Figure 1As shown, an electric grinding tool with a vibration reduction structure disclosed in the present technical solution includes an output shaft 1 and an electric grinder 2. The stator 3 of the electric grinder 2 is pressed into the casing, and the stator 3 and the rotor 4 are sleeved on the rotor core shaft 5 (that is, the rotor core shaft 5 is inserted into the rotor 4 of the electric grinder 2). The rotor core shaft 5 is fixed by the electric grinder 2 (that is, the rotor 4) and the middle cover 6, and the rotor core shaft 5 is rotatable. The output shaft 1 and the rotor core shaft 5 are connected by a connecting sleeve 7. The connecting sleeve 7 provided here connects the output shaft 1 and the rotor core shaft 5 to make the output shaft 1 and the rotor core shaft 5 coaxial, and the connection method between the output shaft 1 and the rotor core shaft 5 and the connecting sleeve 7 is a clearance fit, and the connection has a flat structure for transmission.

[0021] The first bearings 8 are sleeved on the outer sides of both ends of the output shaft 1, and the shaft box 9 is arranged outside the first bearing 8. Here, the shaft box 9 and the first bearing 8 are fitted, and the axial direction of the output shaft 1 is fixed by the first bearing 8 arranged inside the shaft box 9. The shaft box 9 is provided with a plurality of first annular grooves 10, and the first rubber rings 11 are embedded in the first annular grooves 10, and the first rubber rings 11 are sleeved on the first bearing 8. Here, the deformation characteristics of the first rubber ring 11 are utilized to fill the gap between the shaft box 9 and the first bearing 8, that is, in the first annular groove 10, thereby absorbing part of the vibration from the output shaft 1.

[0022] The axle box 9 and the middle cover 6 are connected by screws, and the screws pass through the protective sleeve 17, the axle box 9 and the middle cover 6 and are locked into the housing. That is, the axle box 9 is provided with a second annular groove 12 on one side close to the middle cover 6, and a second rubber ring 13 is provided at the second annular groove 12, and the second rubber ring 13 is sleeved on the middle cover 6. The second rubber ring 13 provided here can prevent the mutual influence between the vibration of the motor and the vibration of the output shaft 1.

[0023] The rotor shaft core 5 is sleeved with a second bearing 14, the outer ring of the second bearing 14 is fitted to the middle cover 6, the middle cover 6 is provided with a third annular groove 15, the third annular groove 15 is embedded with a third rubber ring 16, and the third rubber ring 16 is sleeved on the second bearing 14. The provision of the third rubber ring 16 can reduce the influence of motor vibration on the axle box 9.

[0024] The outer side of the axle box 9 is provided with a protective sleeve 17, and the protective sleeve 17 can adopt the existing technology. The outer side of the axle box 9 is provided with a plurality of fourth grooves 18, and the fourth grooves 18 are embedded with a plurality of rubber strips 19, and the rubber strips are located between the fourth grooves 18 and the protective sleeve 17.

[0025] Although the vibration damping parts in this article are all made of rubber, other materials that can replace rubber can be used as long as their own performance meets the vibration reduction requirements, so they will not be described in detail.

[0026] The embodiments of this specific implementation method are all preferred embodiments of the utility model, and are not intended to limit the protection scope of the utility model. Therefore, all equivalent changes made based on the structure, shape, and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. An electric grinding tool with a vibration reduction structure, comprising an output shaft (1) and an electric grinder (2), wherein a rotor (4) core shaft is inserted into the electric grinder (2), the rotor (4) core shaft is fixed by the electric grinder (2) and an intermediate cover (6), and the rotor (4) core shaft is rotatable, the output shaft (1) and the rotor (4) core shaft are connected by a connecting sleeve (7), and characterized in that: First bearings (8) are sleeved on the outer sides of both ends of the output shaft (1), an axle box (9) is provided on the outer sides of the first bearing (8), the axle box (9) is provided with a plurality of first annular grooves (10), a first rubber ring (11) is embedded in the first annular groove (10), and the first rubber ring (11) is sleeved on the first bearing (8).

2. The electric grinding tool with a vibration reduction structure according to claim 1, characterized in that: The axle box (9) and the middle cover (6) are connected by screws, and a second annular groove (12) is provided on a side of the axle box (9) close to the middle cover (6), a second rubber ring (13) is provided at the second annular groove (12), and the second rubber ring (13) is sleeved on the middle cover (6).

3. The electric grinding tool with a vibration reduction structure according to claim 1, characterized in that: A second bearing (14) is sleeved on the shaft core of the rotor (4); the outer ring of the second bearing (14) is fitted on the intermediate cover (6); a third annular groove (15) is provided on the intermediate cover (6); a third rubber ring (16) is embedded in the third annular groove (15); and the third rubber ring (16) is sleeved on the second bearing (14).

4. The electric grinding tool with a vibration reduction structure according to claim 1, characterized in that: The outer side of the axle box (9) is provided with a protective sleeve (17).

5. The electric grinding tool with a vibration reduction structure according to claim 4, characterized in that: A plurality of fourth grooves (18) are provided on the outer side of the axle box (9), a plurality of rubber strips are embedded in the fourth grooves (18), and the rubber strips are located between the fourth grooves (18) and the protective sleeve (17).

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