A hammer drill

Abstract

The utility model relates to a hammer drill, including the casing and be located in the motor, transmission mechanism, rotating subassembly and impact subassembly in casing, be equipped with gear shift knob on the casing, transmission mechanism is connected with motor transmission, and can be under the action of gear shift knob, the power transmission of motor is selected to rotating subassembly and / or impact subassembly, wherein, gear shift knob includes knob main part and the knob that sets up on the knob main part and drives, drives to stretch into the casing and can with transmission mechanism abut, and drives to set up as powder metallurgy spare, the utility model has the advantages of: the dimensional stability of drive is good, and it is difficult to wear deformation, more durable, prolongs the service life of tool, and the reliability of tool operation is promoted.

Description

Technical Field

[0001] This utility model relates to the field of power tool technology, and in particular to a hammer drill. Background Technology

[0002] A hammer drill is a high-efficiency, multi-functional power tool. Its working principle involves a motor driving a transmission mechanism that selectively transmits power to rotating and / or impact components, enabling various working modes such as rotary drilling, pure impact chiseling, and a combination of rotary and impact. Switching between working modes is typically achieved by rotating a gear selector knob located outside the machine housing. This knob, through a toggle mechanism extending into the housing, alters the power transmission path.

[0003] In the existing technology, shift knobs are usually made of engineering plastics through injection molding. However, due to the need for frequent shifting and the need to withstand impact loads, existing shift knobs are prone to wear, deformation, or even breakage, resulting in unclear gear positions and shifting failure, which seriously affects the service life and reliability of the tool. Summary of the Invention

[0004] The purpose of this invention is to solve the problems mentioned in the background art and to provide a hammer drill.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows: A hammer drill includes a housing and a motor, a transmission mechanism, a rotating component, and an impact component disposed within the housing. The housing is provided with a shift knob. The transmission mechanism is connected to the motor and can selectively transmit the power of the motor to the rotating component and / or the impact component under the action of the shift knob. The shift knob includes a knob body and a toggle part fixed on the knob body. The toggle part extends into the housing and can abut against the transmission mechanism. The toggle part is made of powder metallurgy.

[0006] In one embodiment, the knob body has a mounting groove, and the toggle part is snapped into and fixed in the mounting groove.

[0007] In one embodiment, the toggle part is integrally formed with the knob body.

[0008] In one embodiment, the knob body has a weight-reducing hole on the side facing the inside of the housing.

[0009] In one embodiment, the transmission mechanism includes a transmission shaft and a first clutch and a second clutch slidably sleeved on the transmission shaft. A preset gap is formed between the first clutch and the second clutch along the axial direction of the transmission shaft. The actuating part extends into the preset gap and can collide with the first clutch or the second clutch.

[0010] In one embodiment, the rotating assembly includes a drill sleeve and a drill sleeve gear fitted on the drill sleeve, wherein the first clutch can mesh with the drill sleeve gear and drive the drill sleeve to rotate.

[0011] In one embodiment, a rocker arm bearing is fixed on the drive shaft, the rocker arm bearing is oscillatingly connected to the impact assembly, and the second clutch is connected to the rocker arm bearing via a spline.

[0012] In one embodiment, the knob body has an indicator hole for indication.

[0013] In one embodiment, an O-ring is provided between the housing and the knob body.

[0014] In one embodiment, the housing is provided with heat dissipation holes.

[0015] The advantages of this utility model: The present invention claims a hammer drill, which uses a powder metallurgy part as the actuating part. That is, the actuating part is made by powder metallurgy process. The actuating part is a key force-bearing part. The manufacturing process of the product formed by powder metallurgy material is simple and low cost. It also has high mechanical strength, good product dimensional stability, is not easy to wear and deform, is more durable, extends the service life of the tool, and improves the reliability of the tool operation. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is an overall view of a hammer drill provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of a portion of the structure of a hammer drill provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of a gear shift knob provided in one embodiment of the present invention.

[0018] Reference numerals: 100, hammer drill; 10, housing; 11, heat dissipation hole; 20, transmission mechanism; 21, transmission shaft; 22, first clutch; 23, second clutch; 24, first return spring; 25, second return spring; 26, rocker arm bearing; 30, shift knob; 31, knob body; 311, weight reduction hole; 312, indicator hole; 32, toggle part; 33, O-ring; 41, drill bit gear sleeve. Detailed Implementation

[0019] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0020] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this specification are for illustrative purposes only and do not represent the only possible implementation.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0022] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0023] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this specification belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0024] Please see Figures 1 to 3 A hammer drill 100 provided in one embodiment of the present invention includes a housing 10 and a motor, a transmission mechanism 20, a rotating component and an impact component disposed within the housing 10. The housing 10 is provided with a shift knob 30. The transmission mechanism 20 is connected to the motor and can selectively transmit the power of the motor to the rotating component and / or the impact component under the action of the shift knob 30.

[0025] The shift knob 30 includes a knob body 31 and an actuating part 32 fixed on the knob body 31. The actuating part 32 extends into the housing 10 and can abut against the transmission mechanism 20, used to directly actuate the transmission mechanism 20 to switch the power transmission path. The actuating part 32 is made of powder metallurgy. Thus, by making the actuating part 32 a powder metallurgy part, that is, the actuating part 32 is made by powder metallurgy process, and the actuating part 32 is a key stress-bearing part, the manufacturing process of products formed by powder metallurgy material is simple and low-cost, and the products have high mechanical strength, good dimensional stability, are not easy to wear and deform, are more durable, extend the service life of the tool, and improve the reliability of the tool operation.

[0026] In one embodiment, a mounting groove is provided on the knob body 31, and the toggle part 32 is snapped into and fixed in the mounting groove to achieve a fixed arrangement between the knob body 31 and the toggle part 32.

[0027] In another embodiment, the toggle part 32 and the knob body 31 are integrally formed by powder metallurgy process to achieve a fixed arrangement between the knob body 31 and the toggle part 32.

[0028] like Figure 3 As shown, in one embodiment, the knob body 31 has a weight-reducing hole 311 on the side facing the inside of the housing 10 to reduce the weight of the shift knob 30.

[0029] like Figure 2As shown, in one embodiment, the transmission mechanism 20 includes a transmission shaft 21 and a first clutch 22 and a second clutch 23 slidably sleeved on the transmission shaft 21. The transmission shaft 21 is connected to the output shaft of the motor. A preset gap is formed between the first clutch 22 and the second clutch 23 along the axial direction of the transmission shaft 21. The actuating part 32 extends into the preset gap and can collide with the first clutch 22 or the second clutch 23 to push the first clutch 22 or the second clutch 23 to slide, thereby cutting off the power transmission path between the first clutch 22 and the rotating component or the power transmission path between the second clutch 23 and the impact component, so that the hammer drill 100 only performs the function of hammer or drill.

[0030] Of course, the actuating part 32 may not be in contact with either the first clutch 22 or the second clutch 23. In this case, the transmission mechanism 20 can transmit the power of the motor to the rotating component and the impact component at the same time, so that the hammer drill 100 can perform the functions of hammer and drill at the same time.

[0031] Specifically, a first reset spring 24 and a second reset spring 25 are also sleeved on the drive shaft 21. The first reset spring 24 is used to reset the first clutch 22 and reconnect the power transmission path between the first clutch 22 and the rotating assembly. The second reset spring 25 is used to reset the second clutch 23 and reconnect the power transmission path between the second clutch 23 and the impact assembly.

[0032] Furthermore, the rotating assembly includes a drill sleeve and a drill sleeve gear 41 fitted on the drill sleeve. The first clutch 22 can mesh with the drill sleeve gear 41 and drive the drill sleeve to rotate.

[0033] Furthermore, a rocker arm bearing 26 is fixed on the drive shaft 21, and the rocker arm bearing 26 is oscillatingly connected to the impact assembly. The second clutch 23 is connected to the rocker arm bearing 26 via a spline.

[0034] like Figure 1 As shown, in one embodiment, the knob body 31 has an indicator hole 312 for indication. The indicator hole 312 is triangular, and a gear position indicator is correspondingly provided on the housing 10. The current gear position can be read through the indicator hole 312.

[0035] In one embodiment, an O-ring 33 is provided between the housing 10 and the knob body 31 for sealing, preventing dust and oil from entering the interior of the housing 10 and extending the service life of the hammer drill 100.

[0036] like Figure 1 As shown, in one embodiment, the housing 10 is provided with heat dissipation holes 11 to connect the inside of the hammer drill 100 with the outside air, thereby achieving heat dissipation.

[0037] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0038] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the patent protection scope of this utility model should be determined by the appended claims.

Claims

1. A hammer drill, characterized in that, Includes a housing (10) and a motor, transmission mechanism (20), rotating component and impact component disposed within the housing (10). The housing (10) is provided with a shift knob (30). The transmission mechanism (20) is connected to the motor and can selectively transmit the power of the motor to the rotating component and / or the impact component under the action of the shift knob (30). The shift knob (30) includes a knob body (31) and a toggle part (32) fixed on the knob body (31). The toggle part (32) extends into the housing (10) and can abut against the transmission mechanism (20). The toggle part (32) is a powder metallurgy part.

2. A hammer drill according to claim 1, characterized in that, The knob body (31) has an installation groove, and the toggle part (32) is snapped into the installation groove.

3. A hammer drill according to claim 1, characterized in that, The toggle part (32) is integrally formed with the knob body (31).

4. A hammer drill according to claim 1, characterized in that, The knob body (31) has a weight-reducing hole (311) on the side facing the inside of the housing (10).

5. A hammer drill according to claim 1, characterized in that, The transmission mechanism (20) includes a transmission shaft (21) and a first clutch (22) and a second clutch (23) slidably sleeved on the transmission shaft (21). A preset gap is formed between the first clutch (22) and the second clutch (23) along the axial direction of the transmission shaft (21). The actuating part (32) extends into the preset gap and can collide with the first clutch (22) or the second clutch (23).

6. A hammer drill according to claim 5, characterized in that, The rotating assembly includes a drill sleeve and a drill sleeve gear (41) fitted on the drill sleeve. The first clutch (22) can mesh with the drill sleeve gear (41) and drive the drill sleeve to rotate.

7. A hammer drill according to claim 5, characterized in that, A rocker arm bearing (26) is fixed on the drive shaft (21). The rocker arm bearing (26) is oscillatingly connected to the impact assembly. The second clutch (23) is connected to the rocker arm bearing (26) via a spline.

8. A hammer drill according to claim 1, characterized in that, The knob body (31) has an indicator hole (312) for indicating.

9. A hammer drill according to claim 1, characterized in that, An O-ring (33) is provided between the housing (10) and the knob body (31).

10. A hammer drill according to claim 1, characterized in that, The housing (10) has heat dissipation holes (11).

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