Brushless angle grinder

Abstract

The utility model discloses a brushless angle grinder, and relates to the technical field of angle grinders. Comprising a brushless motor, an output shaft, a grinding piece, a protective cover, a handheld handle, a motor shell, a heat dissipation shell and a rear-end handheld shell, the rear-end handheld shell is fixedly locked and installed at the bottom end of the motor shell, a plurality of protruding blocks used for being connected with the rear-end handheld shell in a matched mode are integrally formed at the bottom end of the motor shell, and notches matched with the protruding blocks are integrally formed in the top end of the rear-end handheld shell. The output end of the brushless motor is in transmission connection with an output shaft through a gear set, a grinding piece is installed on the output shaft, and the protective cover is locked and installed at the side end of the grinding piece. According to the brushless angle grinder, the multi-section split shell design is adopted, and later independent disassembly and maintenance are facilitated; a double-heat-dissipation structural design is adopted, rapid heat dissipation is achieved mainly through the heat dissipation shell, and heat dissipation is assisted through the ventilation pieces; the ventilation sheet is easy to disassemble and assemble, and the circuit board structure at the position is convenient to overhaul. The overall structure is compact and the application effect is good.

Description

Technical Field

[0001] The utility model relates to the technical field of angle grinders, in particular to a brushless angle grinder. Background Art

[0002] The external protective housing structure of traditional angle grinders is typically monolithic, consisting of two halves assembled to form a complete external protective housing. While this improves assembly efficiency to a certain extent, it is not conducive to independent maintenance later on. Because angle grinders are compact for easy handholding, and the motor generates a lot of heat over long periods of operation, the reduced space makes it easier for heat to accumulate inside. Therefore, designing the angle grinder housing structure to improve its heat dissipation is particularly important. Based on this, the inventors researched and proposed this proposal. Utility Model Content

[0003] The utility model provides a brushless angle grinder, which overcomes the shortcomings described in the background technology.

[0004] The technical solution adopted by the utility model to solve its technical problems is:

[0005] A brushless angle grinder includes a brushless motor, an output shaft, a grinding disc, a protective cover, a handheld handle, a motor housing, a heat sink housing, and a rear handheld housing. The heat sink housing is fixedly mounted on the top of the motor housing, and a heat sink groove is provided through the heat sink housing for dissipating heat from the brushless motor. The handheld handle is threadedly connected to the side of the heat sink housing. The rear handheld housing is fixedly mounted on the bottom of the motor housing, and a plurality of bumps are integrally formed at the bottom of the motor housing for adapting to the rear handheld housing. The top of the rear handheld housing is integrally formed with notches that adapt to the bumps. The rear handheld housing is divided into a left half and a right half. After the left half and the rear half are connected and locked by a connector, the top ends of the two are connected to the bottom of the motor housing by means of bumps and notches. The output end of the brushless motor is connected to the output shaft through a gear train. The output shaft is mounted with a grinding disc, and the protective cover is fixedly mounted to the side of the grinding disc.

[0006] A preferred technical solution: The protective cover is arranged in an arc shape along the side end of the grinding plate, and the protective cover occupies half of the circumference of the grinding plate.

[0007] A preferred technical solution: the protective cover is located on the bottom semicircle of the grinding disc.

[0008] A preferred technical solution: a control circuit board and a control switch are arranged in the rear handheld shell.

[0009] A better technical solution: a power cord is connected to the bottom of the rear handheld shell.

[0010] A preferred technical solution: a detachable breathable sheet is nested on the rear handheld shell, and a plurality of holes are provided through the breathable sheet.

[0011] A preferred technical solution: An elastic engaging member is integrally formed at the side end of the ventilation sheet, and an engaging groove adapted to the elastic engaging member is pre-provided on the rear-end hand-held shell.

[0012] A preferred technical solution: The ventilation sheet has an L-shaped structure.

[0013] A preferred technical solution: The gear set includes a first bevel gear and a second bevel gear. The output end of the brushless motor is installed with the first bevel gear, and the second bevel gear is installed at the side end of the output shaft. The first bevel gear meshes with the second bevel gear.

[0014] A preferred technical solution: The handgrip is nested with an anti-slip rubber sleeve.

[0015] By adopting the above technical solutions, the beneficial effects of the present utility model are as follows:

[0016] The brushless angle grinder in the present utility model adopts a multi-section split housing design, which is beneficial for later independent disassembly and maintenance; adopts a double heat dissipation structure design, mainly relying on the heat dissipation shell for rapid heat dissipation, and assisted by the ventilation sheet for heat dissipation; the ventilation sheet is simple to disassemble and assemble, facilitating the inspection of the circuit board structure here. The overall structure is compact and the application effect is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present utility model will be further described below in conjunction with the drawings and embodiments.

[0018] Figure 1 It is a schematic diagram of the overall structure of the present utility model;

[0019] Figure 2 It is a schematic diagram of the structure of the present utility model from another angle;

[0020] Figure 3 It is a schematic diagram of the structure at the heat dissipation shell;

[0021] Figure 4 It is a schematic diagram of the connection and cooperation structure between the ventilation sheet and the rear-end hand-held shell;

[0022] Figure 5 It is a schematic diagram of the inner side of the ventilation sheet;

[0023] Figure 6 It is a schematic diagram of the outer side of the ventilation sheet;

[0024] Figure 7 It is a schematic diagram of the structure of the heat dissipation wheel;

[0025] Figure 8 It is a schematic diagram of the meshing structure between the first bevel gear and the second bevel gear;

[0026] Figure 9 It is a schematic diagram of the connection and cooperation structure at the bottom end of the motor housing and the rear-end hand-held shell.

[0027] Description of Main Reference Numerals:

[0028] 1. Brushless motor; 2. Output shaft; 3. Grinding disc; 4. Protective cover; 5. Hand grip; 6. Motor housing; 61. Bump; 7. Heat dissipation housing; 71. Heat dissipation groove; 8. Rear hand-held housing; 81. Notch; 82. Screw; 9. Gear set; 91. First bevel gear; 92. Second bevel gear; 93. Heat dissipation wheel; 10. Ventilation piece; 101. Hole; 102. Elastic engaging piece. Detailed Implementation Manner

[0029] As Figures 1-9 shown, a brushless angle grinder includes a brushless motor 1, an output shaft 2, a grinding disc 3, a protective cover 4, a hand grip 5, a motor housing 6, a heat dissipation housing 7, and a rear hand-held housing 8. The heat dissipation housing 7 is fixedly installed at the top of the motor housing 6. A heat dissipation groove 71 for dissipating heat from the brushless motor 1 is provided through the heat dissipation housing 7. The hand grip 5 is threadedly connected to the side of the heat dissipation housing 7. The rear hand-held housing 8 is fixedly installed at the bottom of the motor housing 6, and a plurality of bumps 61 for adaptively connecting to the rear hand-held housing 8 are integrally formed at the bottom of the motor housing 6. A notch 81 adapted to the bumps 61 is integrally formed at the top of the rear hand-held housing 8. The rear hand-held housing 8 is divided into a left half and a right half. After the left half and the right half are connected and fixed by a connecting member, which is usually a screw 82, the tops of the two are connected and limited to the bottom of the motor housing 6 through the cooperation of the bumps 61 and the notch 81. The output end of the brushless motor 1 is drivingly connected to the output shaft 2 through a gear set 9. A grinding disc 3 is installed on the output shaft 2. The protective cover 4 is fixedly installed on the side of the grinding disc 3.

[0030] Furthermore, the protective cover 4 is arranged in an arc shape along the side of the grinding disc 3, and the distribution of the protective cover 4 occupies half of the circumference of the grinding disc 3.

[0031] Furthermore, the protective cover 4 is located at the bottom half circumference of the grinding disc 3.

[0032] Furthermore, a control circuit board and a control switch are arranged inside the rear hand-held housing 8.

[0033] Furthermore, a power cord is connected and arranged at the bottom of the rear hand-held housing 8.

[0034] Furthermore, a detachable ventilation piece 10 is nested on the rear hand-held housing 8, and a plurality of holes 101 are provided through the ventilation piece 10.

[0035] Furthermore, an elastic engaging piece 102 is integrally formed at the side of the ventilation piece 10, and a engaging groove adapted to the elastic engaging piece 102 is pre-set on the rear hand-held housing 8.

[0036] Furthermore, the ventilation piece 10 is of an L-shaped structure to increase the ventilation area.

[0037] Further, the gear set 9 includes a first bevel gear 91 and a second bevel gear 92. The output end of the brushless motor 1 is installed with the first bevel gear 91, and the side end of the output shaft 2 is installed with the second bevel gear 92. The first bevel gear 91 meshes with the second bevel gear 92. A heat dissipation wheel 93 is also coaxially installed at the bottom end of the first bevel gear 91.

[0038] Further, an anti-slip rubber sleeve is nested on the hand grip 5.

[0039] The brushless angle grinder in the present utility model uses a brushless motor 1, and has a good grinding driving effect; the multi-section split housing design is conducive to later independent disassembly and maintenance; the double heat dissipation structure design mainly relies on the heat dissipation housing 7 for rapid heat dissipation, and the ventilation fins 10 assist in heat dissipation; the disassembly and assembly method of the ventilation fins 10 is simple and convenient, facilitating the inspection of the circuit board structure here. The overall structure is compact and the application effect is good.

[0040] Basic principle: By controlling the brushless motor 1 to start, the first bevel gear 91 connected to the output end of the brushless motor 1 rotates. The first bevel gear 91 meshes with the second bevel gear 92, and then the output shaft 2 where the second bevel gear 92 is located rotates, and the grinding disc 3 at the other end of the output shaft 2 rotates for grinding. The first bevel gear 91 is smaller than the second bevel gear 92. As Figure 7 shown, it is convenient for high-speed meshing and matching to ensure the grinding power.

[0041] The above is only a preferred embodiment of the present utility model, and thus the scope of implementation of the present utility model cannot be limited thereby. That is, equivalent changes and modifications made according to the scope of the present utility model patent and the content of the specification should still fall within the scope covered by the present utility model.

Claims

1. A brushless angle grinder, characterized in that, It includes a brushless motor, an output shaft, a grinding disc, a protective cover, a hand grip, a motor housing, a heat dissipation housing, and a rear-end hand-held housing. The heat dissipation housing is fixedly installed at the top of the motor housing. Heat dissipation grooves for dissipating heat from the brushless motor are provided through the heat dissipation housing. The hand grip is threadedly connected to the side of the heat dissipation housing. The rear-end hand-held housing is fixedly installed at the bottom of the motor housing, and several protrusions for adaptively connecting to the rear-end hand-held housing are integrally formed at the bottom of the motor housing. A notch adapted to the protrusions is integrally formed at the top of the rear-end hand-held housing. The rear-end hand-held housing is divided into a left half and a right half. After the left half and the right half are connected and locked by a connecting member, the two tops are limited and connected to the bottom of the motor housing through the cooperation of the protrusions and the notches. The output end of the brushless motor is drivingly connected to the output shaft through a gear set. A grinding disc is installed on the output shaft. The protective cover is fixedly installed on the side of the grinding disc.

2. The brushless angle grinder according to claim 1, wherein, The protective cover is arranged in an arc shape along the side of the grinding disc, and the distribution of the protective cover occupies half of the circumference of the grinding disc.

3. The brushless angle grinder according to claim 2, wherein, The protective cover is located at the bottom half of the circumference of the grinding disc.

4. The brushless angle grinder according to claim 1, wherein A control circuit board and a control switch are arranged inside the rear-end hand-held housing.

5. The brushless angle grinder according to claim 4, wherein, A power cord is connected to the bottom of the rear-end hand-held housing.

6. The brushless angle grinder according to claim 1, wherein, A detachable ventilation piece is nested on the rear-end hand-held housing, and several holes are provided through the ventilation piece.

7. The brushless angle grinder according to claim 6, wherein An elastic engaging member is integrally formed at the side of the ventilation piece, and an engaging groove adapted to the elastic engaging member is pre-set on the rear-end hand-held housing.

8. The brushless angle grinder according to claim 6, characterized in that, The ventilation piece is of an L-shaped structure.

9. The brushless angle grinder according to claim 1, wherein The gear set includes a first bevel gear and a second bevel gear. The first bevel gear is installed at the output end of the brushless motor, the second bevel gear is installed at the side of the output shaft, and the first bevel gear meshes with the second bevel gear.

10. The brushless angle grinder according to claim 1, characterized in that, An anti-slip rubber sleeve is nested on the hand grip.

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