CN201295918Y - Electric tool - Google Patents

Abstract

An electric tool includes a switch, a motor, a casing, a gear case, and a transmission device including an impact block. The main shaft of the transmission device has at least one through hole, and the through hole communicates the inside and outside of the gear case. The power tool can effectively relieve the internal pressure of the gear case caused by the impact, thereby alleviating the oil leakage defect.

Description

electrical tools

technical field

The utility model relates to an electric tool, in particular to an electric tool with a gear case.

Background technique

In the field of decoration and decoration, electric tools with gear boxes are more commonly used. Taking the nail gun as an example, the continuous-strike nail gun with a gear case has a strong hitting force, and it is not easy for the nail to be bent or stuck.

The gear case of the continuous striking nail gun is generally a relatively closed space. When the nail gun is working, the main shaft in the gear case drives the impact block to rotate to generate impact. The high temperature generated by the impact partially vaporizes the grease inside the gear case and increases the temperature of the air.

At this time, the internal pressure of the gear case rises. Since the gear case is a relatively closed space, the pressure cannot be released, which will cause the grease in the gear case to leak out from the fitting gaps of the parts, resulting in oil leakage.

Contents of the invention

In order to overcome the deficiencies and defects in the prior art, the utility model provides an improved electric tool.

In order to achieve the above purpose, the electric tool disclosed by the utility model comprises a switch, a motor, a casing, a gear case, and a transmission device including an impact block. The main shaft of the transmission device has at least one through hole, and the through hole communicates with The inside and outside of the gear case, the through hole is L-shaped and has at least two openings, one opening is located at the end of the main shaft and communicates with the outside of the gear case, and the other opening is located on the surface of the main shaft and communicates with the inside of the gear case.

The electric tool with the above structure can effectively release the internal pressure of the gear box caused by the impact, thereby alleviating the oil leakage defect.

Description of drawings

Below in conjunction with accompanying drawing, the utility model is further described.

Fig. 1 is a schematic perspective view of a preferred embodiment of the present invention.

Fig. 2 is a cross-sectional view of the nailing gun shown in Fig. 1 along the separating surface of the two casing halves, wherein the battery pack is removed.

Fig. 3 is a three-dimensional schematic diagram of the transmission device of the nailing gun shown in Fig. 1 .

Fig. 4 is a partial sectional view of the gear case of the nailing gun shown in Fig. 1 .

specific implementation plan

In this embodiment, a nail gun is taken as an example. As shown in FIG. 1 and FIG. 2 , a nail gun 1 includes a casing 3 containing a motor 2 and a nozzle part 4 , and the nozzle part 4 is approximately perpendicular to the casing 3 . In this embodiment, the nailing gun 1 also includes a battery pack 5 for powering the motor 2, but the power supply mode of the nailing gun disclosed in the utility model is not limited thereto, and it can also be powered by alternating current. The switch 6 is installed on the casing 3 for controlling the start and stop of the motor 2 . Nozzle part 4 comprises a push rod 17 that can push nail 7, and push rod 17 is installed in the nozzle part 4 by spring 22, and can do linear reciprocating motion therein, during operation, the end face of push rod 17 acts on The head of the nail 7. The muzzle part 4 also includes a muzzle 23 .

As shown in FIGS. 2 to 4 , the casing 3 also includes a mechanical transmission device, which can transmit the rotational motion of the motor 2 into the impact motion of the push rod 17 . The motor 2 is vertically installed in the casing 3, the motor shaft 18 is connected with the input end of the transmission, and the power output end of the transmission is matched with the push rod 17. The motor 2 transmits the rotational power to the main shaft 8 through multi-stage gear transmission. The main shaft 8 and the motor shaft 18 are perpendicular to each other, and the main shaft 8 is provided with two pairs of inclined slots 9 . An impact member 10 is set on the main shaft 8 , the impact member 10 is roughly a hollow cylinder, and a pair of guide grooves 21 opposite to the chute 9 are provided on the inner cylinder surface. A pair of steel balls 12 are located between the chute 9 and the guide groove 21, so when the main shaft 8 rotates, the steel balls 12 located in the chute 9 can drive the impact member 10 to rotate. A spring 13 is installed between the impact piece 10 and the main shaft 8 , one end of which is against the step 11 of the main shaft 8 , and the other end is against the impact piece 10 . When the main shaft 8 rotates, the protrusion 14 hits the end face of the push rod 17, and the push rod 17 compresses the spring 22 under the impact force of the impact member 10 and hits the nail, thereby forming an impact.

The main shaft 8 is driven by the gear 15 indirectly driven by the motor shaft 18, and the bearing 16 is located at the end of the main shaft. The gear housing 19 has an opening 24 to expose the end of the main shaft 8 . The through hole 20 is located on the main shaft 8 , and in this embodiment, the cross section of the through hole 20 is L-shaped. The through hole 20 has a first opening 20a and a second opening 20b. The first opening 20 a is located on the surface of the main shaft 8 and communicates with the inside of the gear case 19 . The second opening 20 b is located at the end of the main shaft 8 and communicates with the outside of the gear case 19 .

When the nail gun is working, the motor 2 drives the transmission device to operate at a high speed and drives the impact member 10 to generate impact. The high temperature generated by the impact partially vaporizes the internal grease. At the same time, the temperature increases, causing the internal pressure of the gear case 19 to increase. The high-pressure air inside the gear case 19 is discharged from the through hole 20 in the direction of the arrow in the figure, effectively reducing the internal pressure, thereby alleviating the possibility of oil leakage.

When the grease vaporized due to high temperature enters the first opening 20 a of the through hole 20 , it may be solidified by cooling and adhere to the wall of the first opening 20 a. However, the main shaft 8 is running at high speed, and the centrifugal force generated can throw the attached grease out of the first opening 20a, thereby preventing the through hole 20 from losing the effect of releasing pressure due to blockage.

Those skilled in the art can also appreciate that the section of the through hole 20 can also be arc-shaped, or other shapes that can connect the inside and outside of the gear case 19 . The openings on the surface of the main shaft 8 can also be multiple for better exhaust and decompression. The electric tool disclosed by the utility model is not limited to the content described in the above embodiments and the structures shown in the accompanying drawings. Obvious changes, substitutions or modifications made to the shapes and positions of the components on the basis of the present utility model are all within the protection scope of the utility model.

Claims (3)

1. An electric tool comprising a switch, a motor, a casing, a gear case, and a transmission device comprising an impact block, wherein the main shaft of the transmission device has at least one through hole, and the through hole communicates with the gear Chassis interior and exterior. 2. The electric tool according to claim 1, wherein the through hole has at least two openings, one opening is located at the end of the main shaft and communicates with the outside of the gear housing, and the other opening is located on the surface of the main shaft and communicates with the inside of the gear housing. 3. The electric tool according to claim 2, wherein the through hole is L-shaped.

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