An integrally formed driven gear for an impact drill and an impact drill

Abstract

This utility model relates to the field of impact drill structure technology, specifically an integrally formed impact drill driven gear and impact drill. It includes a driven gear body, characterized by a central insertion hole in the driven gear body, and moving impact teeth arranged circumferentially on the outer side of the insertion hole. The moving impact teeth are integrally formed with the driven gear body using powder metallurgy. The impact drill includes a housing, an output shaft, static impact teeth, a driven gear, moving impact teeth, a rolling bearing, and a pressure spring. The driven gear includes a driven gear body and moving impact teeth, which are distributed on the side of the driven gear body and integrally connected to it. It has advantages such as simple structure, low production cost, high assembly efficiency, low counterweight, and small size.

Description

Technical Field

[0001] This utility model relates to the field of impact drill structure technology, specifically to an integrated impact drill driven gear and impact drill that is simple in structure, low in production cost, high in assembly efficiency, low in counterweight and light in weight. Background Technology

[0002] As is well known, "electric drills" are a standard product category of power tools and also the largest category in terms of demand. They account for approximately 35% of the total production and sales volume of power tools in China. Besides established power tool manufacturers such as Bosch and Black & Decker, which have long produced cordless drills, in recent years, numerous domestic power tool manufacturers, large and small, have also begun producing DC drills, leading to a continuous increase in market demand for their spare parts. In DC drills, by adding a set of paired impact ratchet teeth, the impact function is enhanced, making these impact drills more efficient during drilling operations.

[0003] Currently, the impact structure of a DC impact drill typically includes a nylon housing, moving impact teeth, stationary impact teeth, rolling bearings, and an output shaft. The stationary impact teeth and bearings are embedded inside the nylon housing, while the moving impact teeth are interference-fitted with the drive shaft and rotate with it. When the drill is working, the moving and stationary impact teeth continuously separate and mesh to achieve the impact function. In this traditional structure, the stationary impact teeth and the driven gear are two separate parts, and the moving impact teeth are manufactured using traditional machining processes, resulting in high processing costs. The two parts are press-fitted onto the output shaft twice, which also makes the overall structure of the impact drill heavy. Summary of the Invention

[0004] The purpose of this utility model is to overcome the shortcomings of the prior art and provide an integrated molded impact drill driven gear and impact drill that is simple in structure, low in production cost, high in assembly efficiency, low in counterweight and light in weight.

[0005] The technical solution adopted by this utility model to solve its technical problem is: A driven gear for an integrally formed impact drill includes a driven gear body. The driven gear body has an insertion inner hole in the middle, and moving impact teeth are provided on the driven gear body in the circumferential direction outside the insertion inner hole. The moving impact teeth are arranged in a circumferential direction, and the moving impact teeth are integrally formed with the driven gear body by powder metallurgy.

[0006] The dynamic impact tooth described in this invention is hidden inside the side of the driven gear body or protrudes from the side of the driven gear body at a height of 1-5mm, which can reduce the overall weight of the driven gear body while ensuring the impact effect.

[0007] An impact drill with an integrally formed driven gear, characterized in that the impact drill includes a housing, an output shaft, static impact teeth, a driven gear, a moving impact teeth, a rolling bearing, and a pressure spring. The driven gear includes a driven gear body and moving impact teeth. Static impact teeth are fixedly connected to one side of the housing, and the side of the static impact teeth mates with the moving impact teeth. The moving impact teeth are distributed on the side of the driven gear body and integrally connected to the driven gear body. The insertion inner hole of the driven gear body is interference-fitted with the output shaft. The output shaft extends out of the housing and is connected to the housing through the rolling bearing. A pressure spring is sleeved on the outside of the output shaft, and the pressure spring abuts against the housing and the driven gear.

[0008] This utility model, due to the above-mentioned structure, has the advantages of simple structure, low production cost, high assembly efficiency, low weight, and small size. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the driven gear structure of this utility model.

[0010] Figure 2 yes Figure 1 A sectional view.

[0011] Figure 3 This is a schematic diagram of the internal structure of the impact drill of this utility model. Detailed Implementation

[0012] The present invention will be further described below with reference to the accompanying drawings: As shown in the attached figure, an integrally formed impact drill driven gear is provided with a driven gear body 1. The driven gear body 1 is characterized by having an insertion inner hole 2 in the middle, and a moving impact tooth 3 on the driven gear body 1 in the outer circumferential direction of the insertion inner hole 2. The moving impact tooth 3 is arranged in the circumferential direction, and the moving impact tooth 3 is integrally connected to the driven gear body 1 by powder metallurgy.

[0013] Furthermore, the moving impact tooth 3 is hidden inside the side of the driven gear body 1 or protrudes from the side of the driven gear body 1 at a height of 1-5mm, which can reduce the overall weight of the driven gear body 1 while ensuring the impact effect.

[0014] An impact drill with an integrally formed driven gear, characterized in that the impact drill includes a housing 4, an output shaft 5, a static impact tooth 6, a driven gear, a moving impact tooth 3, a rolling bearing 7, and a pressure spring 8. The driven gear includes a driven gear body 1 and a moving impact tooth 3. The static impact tooth 6 is fixedly connected to one side of the housing 4. The side of the static impact tooth 6 mates with the moving impact tooth 3. The moving impact tooth 3 is distributed on the side of the driven gear body 1 and integrally connected with the driven gear body 1. The insertion inner hole 2 of the driven gear body 1 is interference-fitted with the output shaft 5. The output shaft 5 extends out of the housing 4 and is connected to the housing 4 through the rolling bearing 7. A pressure spring 8 is sleeved on the outside of the output shaft 5 and abuts against the housing 4 and the driven gear.

[0015] In use, this utility model involves preparing an integrally formed driven gear for an impact drill using a powder metallurgy molding die. The resulting integrally formed driven gear includes a driven gear body 1 and a moving impact tooth 3. Since the driven gear body 1 and the moving impact tooth 3 are integrally formed, and the moving impact tooth 3 is either hidden inside the side of the driven gear body 1 or protrudes from the side of the driven gear body 1 at a height of 1-5mm, the tooth disc structure of the moving impact tooth 3 is reduced, as is the thickness of the tooth disc, thereby reducing the overall volume and weight of the impact drill and lowering production costs. When installing the impact drill, the integrally formed driven gear with the moving impact tooth 3 can be directly interference-fitted onto the output shaft 5, eliminating the installation steps of two parts and improving assembly efficiency. Inside the housing 4 of the drill bit, a drive gear is provided on the side of the driven gear, which meshes with the driven gear. The drive gear is connected to the drive shaft, which extends out and can be rotatably connected to the housing 4 via a rolling bearing 7. The drive shaft is connected to the output end of the electric drill. The structure and connection relationship between the drive gear, drive shaft, and output end of the electric drill are not modified by this patent and are the same as the prior art, so they will not be described in detail here. In use, the output end of the electric drill drives the drive shaft to rotate, the drive shaft drives the drive gear to rotate, and the drive gear drives the driven gear to rotate. The moving impact teeth 3 on the driven gear and the stationary impact teeth 6 on the housing 4 are misaligned and impact each other, thereby realizing the impact movement of the output shaft 5 and realizing the impact function. Due to the above structure, this utility model has the advantages of simple structure, low production cost, high assembly efficiency, low counterweight, and small size.

Claims

1. A driven gear for an integrally formed impact drill, comprising a driven gear body, characterized in that... The driven gear body has an insertion inner hole in the middle, and moving impact teeth are provided on the driven gear body in the outer circumferential direction of the insertion inner hole. The moving impact teeth are arranged in the circumferential direction and are integrally connected to the driven gear body by powder metallurgy.

2. The integrally formed driven gear of an impact drill according to claim 1, characterized in that... The moving impact teeth are hidden inside the side of the driven gear body or protrude from the side of the driven gear body at a height of 1-5mm, which can reduce the overall weight of the driven gear body while ensuring the impact effect.

3. An impact drill employing the integrally formed driven gear of claim 1, characterized in that... An impact drill with an integrally formed driven gear, characterized in that the impact drill includes a housing, an output shaft, static impact teeth, a driven gear, a moving impact teeth, a rolling bearing, and a pressure spring. The driven gear includes a driven gear body and moving impact teeth. Static impact teeth are fixedly connected to one side of the housing, and the side of the static impact teeth mates with the moving impact teeth. The moving impact teeth are distributed on the side of the driven gear body and integrally connected to the driven gear body. The insertion inner hole of the driven gear body is interference-fitted with the output shaft. The output shaft extends out of the housing and is connected to the housing through the rolling bearing. A pressure spring is sleeved on the outside of the output shaft, and the pressure spring abuts against the housing and the driven gear.

Images