Electric chain saw

Abstract

The utility model discloses an electric chain saw which comprises a chain saw shell, a chain saw lower shell (1), a gearbox lower shell (2) and a motor. The chain saw lower shell (1) is fixed on a chain saw shell, the gear box lower shell (2) is fixed in a hole of the chain saw lower shell (1) to form a containing cavity (3), the gear box lower shell (2) serves as the inner bottom face of the containing cavity (3), and a center hole (4) is formed in the gear box lower shell (2). The device is characterized in that the motor is a brush motor (5) or a brushless motor (6); the electric chain saw not only can be provided with a brush motor, but also can be provided with a brushless motor, and is convenient to assemble, the connection strength can be ensured, and the production complexity and cost are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of electric tools, in particular to an electric chain saw. Background Art

[0002] Power tools are very commonly used tools in our daily life. There are many brands and types, and the competition is fierce. Manufacturers and users are very sensitive to prices.

[0003] Power tools use two types of motors: brushless and brushed. Each has its own advantages and disadvantages. Brushless DC motors: Because they eliminate carbon brushes, they offer low noise, require no maintenance, have a low failure rate, and a long service life. They also offer relatively stable operating time and voltage, and minimize interference with radio equipment. However, they are expensive, resulting in high equipment costs. Brushed DC motors: They offer fast starting, timely braking, smooth speed regulation, simple control, a simple structure, and a low price. The key is affordability. Currently, manufacturers of power tools, such as electric chain saws, produce two types simultaneously: one with a brushed motor and the other with a brushless motor. Due to the significant design differences between these two motors, not only do they require different mounting locations and supporting components, but they also require corresponding molds, which undoubtedly increases production complexity and costs. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide an electric chain saw which can be installed with either a brushed motor or a brushless motor, is easy to assemble, has guaranteed connection strength, and reduces production complexity and cost.

[0005] The technical solution of the utility model is to provide an electric chain saw having the following structure, including a chain saw housing, a chain saw lower housing, a gear box lower housing, and a motor; the chain saw lower housing is fixed to the chain saw housing, the gear box lower housing is fixed in a hole of the chain saw lower housing to form an accommodating cavity, the gear box lower housing serves as the inner bottom surface of the accommodating cavity, and the gear box lower housing is provided with a center hole; the motor is a brushed motor or a brushless motor; when the electric chain saw is installed with the brushed motor, the brushed motor is provided with a first outer cover, the first outer cover is fixed to the chain saw lower housing, the body of the brushed motor is embedded in the accommodating cavity, the first output shaft of the brushed motor passes through the center hole, and a bearing is provided between the first output shaft of the brushed motor and the chain saw lower housing; when the electric chain saw is installed with the brushless motor, the brushless motor is provided with a second outer cover, the second outer cover is fixed to the chain saw lower housing, the body of the brushless motor is embedded in the accommodating cavity, the second output shaft of the brushless motor passes through the center hole, and the body of the brushless motor is detachably fixed to the chain saw lower housing.

[0006] The chain saw lower shell is provided with a plurality of first bolt holes, the first outer cover and the second outer cover are provided with a plurality of second bolt holes, and each first bolt hole corresponds to a second bolt hole and is fixed by bolt connection.

[0007] The outer end of the central hole of the gear box lower shell is a countersunk hole, and a first bearing is provided in the countersunk hole. The inner ring of the first bearing is tightly matched with the first output shaft of the brushed motor, and the outer ring is tightly matched with the outer wall of the countersunk hole.

[0008] The detachable fixed connection between the body of the brushless motor and the lower housing of the gear box means that the lower housing of the gear box is provided with a plurality of third screw holes next to the center hole, and a fourth bolt hole is provided on the end face of the brushless motor, and each third screw hole corresponds to a fourth bolt hole and is fixed by bolt connection.

[0009] When the brushless motor is installed, a filling block is provided between the second output shaft and the inner wall of the center hole, and a distance is provided between the inner wall of the filling block and the outer wall of the second output shaft.

[0010] When the electric chain saw is installed with a brush motor, a second bearing is provided at the tail end of the second outer cover, and the tail end of the first output shaft passes through the second bearing.

[0011] With the above structure, the present invention has the following advantages: 1. Because the motor is either a brushed or brushless motor, the electric chain saw can be equipped with either a brushed or brushless motor without changing the saw's main structure or mold. This ensures connection strength after disassembly and assembly, reducing production complexity and costs. 2. The unified design of the motor mounting interface greatly simplifies motor disassembly and assembly. Users or technicians can replace the motor in just a few simple steps. This simplified operation not only improves maintenance and repair efficiency but also reduces the risk of damage caused by improper operation. 3. While simplifying the disassembly and assembly process, connection strength is fully guaranteed. The universal interface utilizes high-strength connectors and a reliable fixing method, ensuring that the motor will not loosen or fall off during high-speed operation. This not only improves the safety of the electric chain saw but also extends its service life. 4. The production process becomes simpler and more efficient. Manufacturers can use the same production line and mold to produce different models, significantly reducing production costs.

[0012] As an improvement, the lower shell of the chain saw is provided with a plurality of first bolt holes, and the first outer cover and the second outer cover are provided with a plurality of second bolt holes. Each first bolt hole corresponds to a second bolt hole and is fixed by bolt connection, making disassembly and installation convenient.

[0013] As an improvement, the outer end of the center hole of the lower shell of the gear box is a countersunk hole, and a first bearing is provided in the countersunk hole. The inner ring of the first bearing is tightly fitted with the first output shaft of the brushed motor, and the outer ring is tightly fitted with the outer wall of the countersunk hole, which positions the output shaft to prevent eccentricity.

[0014] As an improvement, the detachable fixed connection between the body of the brushless motor and the lower housing of the gear box means that the lower housing of the gear box is provided with a plurality of third screw holes next to the center hole, and a fourth bolt hole is provided on the end face of the brushless motor. Each third screw hole corresponds to a fourth bolt hole and is fixed by bolt connection, making disassembly and installation convenient.

[0015] As an improvement, when the electric chain saw is installed with a brush motor, a second bearing is provided at the tail end of the second outer cover, and the tail end of the first output shaft passes through the second bearing to position the first output shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of an electric chain saw according to the present invention equipped with a brushed motor.

[0017] Figure 2 This is a split schematic diagram of an electric chain saw of the present invention equipped with a brush motor.

[0018] Figure 3 The utility model is a cross-sectional schematic diagram of an electric chain saw equipped with a brush motor.

[0019] Figure 4 This is a cross-sectional schematic diagram of an electric chain saw of the present invention equipped with a brush motor.

[0020] Figure 5 This is a schematic diagram of installing a brushless motor in an electric chain saw according to the present invention.

[0021] Figure 6 This is a split schematic diagram of the electric chain saw of the present invention installed with a brushless motor.

[0022] Figure 7 This is a cross-sectional schematic diagram of an electric chain saw according to the present invention installed with a brushless motor.

[0023] Figure 8 This is a cross-sectional schematic diagram of an electric chain saw according to the present invention installed with a brushless motor.

[0024] As shown in the figure:

[0025] 1. Chain saw lower housing, 2. Gearbox lower housing, 3. Accommodating cavity, 4. Center hole, 5. Brushed motor, 6. Brushless motor, 7. First outer cover, 8. Second outer cover, 9. First bolt hole, 10. Second bolt hole, 11. First bearing, 12. Third screw hole, 13. Fourth bolt hole, 14. First output shaft, 15. Second output shaft, 16. Second bearing. DETAILED DESCRIPTION

[0026] The present invention will be further described below with reference to the accompanying drawings.

[0027] like Figure 1-4 As shown, the present invention discloses an electric chain saw equipped with a brush motor, comprising a chain saw housing, a chain saw lower housing 1, a gearbox lower housing 2, and a motor. The chain saw lower housing 1 is fixed to the chain saw housing, and the gearbox lower housing 2 is fixed within a hole in the chain saw lower housing 1 to form a receiving cavity 3. The gearbox lower housing 2 serves as the inner bottom surface of the receiving cavity 3 and is provided with a center hole 4. The motor is a brushed motor 5. When the brushed motor 5 is installed in the electric chain saw, the brushed motor 5 is provided with a first outer cover 7, which is fixed to the chain saw lower housing 1. The body of the brushed motor 5 is embedded in the receiving cavity 3. The first output shaft 14 of the brushed motor 5 extends through the center hole 4. A bearing is provided between the first output shaft 14 of the brushed motor 5 and the chain saw lower housing 1. The chain saw lower housing 1 is provided with a plurality of first bolt holes 9, and the first and second outer covers 7 and 8 are provided with a plurality of second bolt holes 10. Each first bolt hole 9 corresponds to a second bolt hole 10 and is secured by bolts. The outer end of the center hole 4 of the gearbox lower housing 2 is a countersunk hole, which houses a first bearing 11. The inner ring of the first bearing 11 tightly fits the first output shaft 14 of the brushed motor 5, while the outer ring tightly fits the outer wall of the countersunk hole. When the brushed motor 5 is installed in the electric chain saw, a second bearing 16 is installed at the rear end of the second outer cover 8, and the rear end of the first output shaft 14 passes through the second bearing 16.

[0028] like Figure 4-8As shown, the utility model is an electric chain saw installed with a five-brush motor, comprising a chain saw casing, a chain saw lower casing 1, a gear box lower casing 2 and a motor; the chain saw lower casing 1 is fixed on the chain saw casing, the gear box lower casing 2 is fixed in the hole of the chain saw lower casing 1 to form a accommodating cavity 3, the gear box lower casing 2 serves as the inner bottom surface of the accommodating cavity 3, and the gear box lower casing 2 is provided with a center hole 4; the motor is a brushless motor 6; when the brushless motor 6 is installed on the electric chain saw, the brushless motor 6 is provided with a second outer cover 8, which is fixed on the chain saw lower casing 1, and the body of the brushless motor 6 is embedded in the accommodating cavity 3; the second output shaft 15 of the brushless motor 6 passes through the center hole 4, and the body of the brushless motor 6 is detachably fixed to the chain saw lower casing 1. The detachable fixed connection between the body of the brushless motor 6 and the gearbox lower housing 2 means that the gearbox lower housing 2 is provided with a plurality of third screw holes 12 next to the center hole 4, and a fourth bolt hole 13 is provided on the end face of the brushless motor 6, and each third screw hole 12 corresponds to a fourth bolt hole 13 and is fixed by bolt connection. When the brushless motor 6 is installed, a filling block is provided between the second output shaft 15 and the inner wall of the center hole 4, and there is a gap between the inner wall of the filling block and the outer wall of the second output shaft 15. When the brushless motor 6 is installed in the electric chain saw, a second bearing 16 is provided at the rear end of the second outer cover 8, and the rear end of the first output shaft 14 passes through the second bearing 16.

Claims

1. An electric chain saw, comprising a chain saw housing, a chain saw lower housing (1), a gear box lower housing (2), and a motor; the chain saw lower housing (1) is fixed to the chain saw housing, the gear box lower housing (2) is fixed in a hole of the chain saw lower housing (1) to form an accommodating cavity (3), the gear box lower housing (2) serves as the inner bottom surface of the accommodating cavity (3), and the gear box lower housing (2) is provided with a center hole (4); and the characteristics are: The motor is a brushed motor (5) or a brushless motor (6); when the electric chain saw is installed with the brushed motor (5), the brushed motor (5) is provided with a first outer cover (7), the first outer cover (7) is fixed on the lower shell (1) of the chain saw, the body of the brushed motor (5) is embedded in the accommodating cavity (3), the first output shaft (14) of the brushed motor (5) passes through a center hole (4), and a bearing is provided between the first output shaft (14) of the brushed motor (5) and the lower shell (1) of the chain saw; when the electric chain saw is installed with the brushless motor (6), the brushless motor (6) is provided with a second outer cover (8), the second outer cover (8) is fixed on the lower shell (1) of the chain saw, the body of the brushless motor (6) is embedded in the accommodating cavity (3), the second output shaft (15) of the brushless motor (6) passes through a center hole (4), and the body of the brushless motor (6) and the lower shell (1) of the chain saw are detachably fixedly connected.

2. The electric chain saw according to claim 1, characterized in that: The chain saw lower housing (1) is provided with a plurality of first bolt holes (9), and the first outer cover (7) and the second outer cover (8) are provided with a plurality of second bolt holes (10), and each first bolt hole (9) corresponds to a second bolt hole (10) and is fixed by bolt connection.

3. The electric chain saw according to claim 1, characterized in that: The outer end of the central hole (4) of the gearbox lower housing (2) is a countersunk hole, and a first bearing (11) is provided in the countersunk hole. The inner ring of the first bearing (11) is tightly matched with the first output shaft (14) of the brushed motor (5), and the outer ring is tightly matched with the outer wall of the countersunk hole.

4. The electric chain saw according to claim 1, characterized in that: The detachable fixed connection between the body of the brushless motor (6) and the gearbox lower housing (2) means that the gearbox lower housing (2) is provided with a plurality of third screw holes (12) beside the center hole (4), and a fourth bolt hole (13) is provided on the end face of the brushless motor (6), and each third screw hole (12) corresponds to a fourth bolt hole (13) and is fixed by bolt connection.

5. The electric chain saw according to claim 1, characterized in that: When the brushless motor (6) is installed, a filling block is provided between the second output shaft (15) and the inner wall of the center hole (4), and a distance is provided between the inner wall of the filling block and the outer wall of the second output shaft (15).

6. The electric chain saw according to claim 3, characterized in that: When the brushless motor (6) is installed on the electric chain saw, a second bearing (16) is provided at the tail end of the second outer cover (8), and the tail end of the first output shaft (14) passes through the second bearing (16).

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