High-low speed adjusting mechanism of double-speed electric drill

Abstract

The utility model discloses a high-low speed adjusting mechanism of a double-speed electric drill. The high-low speed adjusting mechanism comprises a gear box fixedly arranged in a machine shell, a push button assembly connected to the upper surface of the machine shell in a sliding mode and a gear shifting steel wire used for driving the gear box to shift gears at high speed and low speed. An original integrated push button assembly is improved into a split type of the gear shifting push button and the gear shifting push plate, and the elastic elements are additionally arranged in the gear shifting push button and the gear shifting push plate, so that the gear shifting push button and the gear shifting push plate form a combination of two parts capable of differential motion, reliable high and low speed switching is achieved, and the gear shifting push button and the gear shifting push plate are simple in structure and convenient to use. According to the electric drill gear shifting device, the problem of gear shifting failure during gear shifting of an electric drill is effectively solved, meanwhile, a gear shifting gear ring is prevented from being damaged, and therefore the service life of a machine gear box is prolonged, and the use experience of consumers is greatly improved.

Description

Technical Field

[0001] This utility model belongs to the field of power tool technology, specifically relating to a high and low speed adjustment mechanism for a dual-speed electric drill. Background Technology

[0002] Electric drills are widely used in power tools, especially in DC electric drills, where mechanical dual-speed drills are very common. These drills use a shift knob to move the drill axially, and through a lever principle, the shift wire moves in the opposite direction. At the same time, the shift gear ring in the gearbox moves synchronously with the shift wire to the set position, thus enabling the high and low speed switching of the electric drill.

[0003] Dual-speed electric drills on the market, such as the "dual-speed electric drill" disclosed in Chinese utility model patent application number 201220646165.2, can switch between high and low speeds by setting a push button assembly and assembling it with the drill to adapt to different drilling needs. However, this structure still has the following drawbacks: When switching the drill to high or low speed, it is necessary to push the shift push button to stop the shift gear ring and engage with the high-speed or low-speed gear ring. However, during the engagement process, the shift gear ring and the corresponding stationary gear ring may come into contact with each other, which can cause the drill to fail to shift gears. Furthermore, repeatedly pushing the shift push button to attempt to shift gears can damage the shift gear ring and significantly reduce the service life of the gearbox. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a high and low speed adjustment mechanism for a dual-speed electric drill.

[0005] To solve the above-mentioned technical problems and achieve the above-mentioned technical effects, this utility model is implemented through the following technical solution:

[0006] A high / low speed adjustment mechanism for a dual-speed electric drill includes a gearbox fixedly installed inside a housing, a push button assembly slidably connected to the upper surface of the housing, and a shift wire for driving the gearbox to shift between high and low speeds. The push button assembly includes a shift push button, an elastic element, and a shift push plate. The shift push button is slidably connected to the upper surface of the housing. A push handle is provided at the center of the top of the shift push button, and a groove for accommodating the elastic element is provided at the bottom of the shift push button. The shift push plate is slidably connected to the bottom of the shift push button. A protrusion is provided at the center of the top of the shift push plate, which divides the groove into a front chamber and a rear chamber. An elastic element is provided in each of the front and rear chambers. The top of the shift wire is hinged to the bottom of the shift push plate, the middle of the shift wire is rotatably connected to the outer wall of the gearbox, and the bottom of the shift wire extends into the gearbox and connects to the shift gear ring.

[0007] Further, the gear box is provided with a high-speed blocking gear ring at the front end, a shifting gear ring at the middle part and a low-speed blocking gear ring at the rear end.

[0008] Further, the shifting push plate is provided with a shifting steel wire installation groove at the bottom, and the top of the shifting steel wire is rotatably arranged in the shifting steel wire installation groove.

[0009] Further, the shifting steel wire is composed of a hinged part at the top, a rotating part at the middle part and a pushing part at the bottom, the hinged part is hinged with the shifting steel wire installation groove, the rotating part includes a rotating ring arranged around the fixed shaft on both sides of the gear box, and the pushing part is a connecting hook which extends into the arc-shaped groove on both sides of the gear box and is fixedly connected with the shifting gear ring on both sides.

[0010] Further, the length of the arc-shaped groove is slightly larger than the movement path of the pushing part, and the curvature of the arc-shaped groove matches the rotating curvature of the pushing part.

[0011] Further, the upper surface of the casing is provided with a shifting push button installation groove for accommodating the shifting assembly, the shifting push plate is arranged in the shifting push button installation groove, and the handle of the shifting push button extends out of the shifting push button installation groove.

[0012] Further, the bottom of the shifting push button is further provided with a shifting push button steel wire for supporting the shifting push button.

[0013] Further, the bottom of the shifting push button is provided with a front end face and a rear end face, and the front and rear ends of the elastic element in the front chamber respectively abut against the front end face of the bottom of the shifting push button and the protrusion of the shifting push plate; the front and rear ends of the elastic element in the rear chamber respectively abut against the protrusion of the shifting push plate and the rear end face of the bottom of the shifting push button.

[0014] Further, the elastic element is preferably a cylindrical spring. Advantages

[0015] Compared with the prior art, the utility model discloses the integral type push button subassembly of original improvement becomes the split type form of gear shifting push button and gear shifting push plate, and the elastic element is added in gear shifting push button and gear shifting push plate, makes gear shifting push button and gear shifting push plate become two parts that can be differential combination, when gear shifting gear ring and corresponding fixed gear ring appear mutual top -hold situation when high -low speed switching, gear shifting push plate can not be affected first in place although gear shifting gear ring temporarily can not be pushed gear shifting gear ring translation by gear shifting steel wire, and the corresponding side elastic element is compressed and accumulates force, when gear shifting gear ring and corresponding fixed gear ring in the running process mutual top -hold point is avoided automatically, the elastic element that is compressed can immediately give gear shifting push plate an axial thrust, thereby drive gear shifting steel wire and gear shifting gear ring axial movement and corresponding fixed gear ring are engaged, and then reliable high -low speed switching is realized, effectively solve the problem of gear shifting failure when electric drill switches gear position, also avoid the damage to gear shifting gear ring, thereby prolong the service life of machine gear box, greatly improve the use experience of consumer.

[0016] The above description is only a summary of the technical scheme of the utility model, in order to more clearly understand the technical means of the utility model, and can be implemented according to the content of the specification, the following preferred embodiments of the utility model are described in detail with the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0017] The drawings described herein are used to provide further understanding of the utility model, constitute a part of this application, the illustrative embodiment of the utility model and its explanation are used to explain the utility model, and do not constitute undue limitation on the utility model.

[0018] Figure 1 It is the structural schematic diagram of the utility model low speed state;

[0019] Figure 2 It is Figure 1 The sectional view of the utility model;

[0020] Figure 3 It is the structural schematic diagram of the utility model high speed state;

[0021] Figure 4 It is Figure 3 The sectional view of the utility model;

[0022] Figure 5 It is the structure diagram of push button subassembly in the utility model;

[0023] Figure 6 It is the explosion drawing of push button subassembly in the utility model.

[0024] Figure 7The structure diagram of the electric drill is located in the electric drill.

[0025] In the figure: 1, the casing; 3, shift push button; 4, shift push button steel wire; 5, elastic element; 6, shift push plate; 7, shift steel wire installation groove; 8, shift steel wire; 9, fixed shaft; 10, arc slot; 11, gear box; 13, low speed gear ring; 14, high speed gear ring; 15, shift gear ring. DETAILED DESCRIPTION

[0026] The utility model will be described below in detail with reference to the drawings and in combination with the embodiments. The description here is used to provide further understanding of the utility model, constitutes a part of the present application, the illustrative embodiment of the utility model and its description are used to explain the utility model, and do not constitute improper limitation to the utility model.

[0027] Referring to Figures 1-7 The high-low speed adjusting mechanism of the double-speed electric drill mainly comprises a gear box 11 fixedly arranged in the casing 1, a push button assembly slidably connected to the upper surface of the casing 1, and a shift steel wire 8 for driving the gear box 11 to shift between high speed and low speed.

[0028] The gear box 11 is provided with a high speed gear ring 14 located at the front end in the gear box 11, a shift gear ring 15 located at the middle in the gear box 11, and a low speed gear ring 13 located at the rear end in the gear box 11.

[0029] The push button assembly comprises a shift push button 3, an elastic element 5 and a shift push plate 6. The shift push button 3 is slidably connected to the upper surface of the casing 1. A push handle is arranged at the center of the top of the shift push button 3. A recess for accommodating the elastic element 5 is arranged at the bottom of the shift push button 3. The shift push plate 6 is slidably connected to the bottom of the shift push button 3. A protrusion is arranged at the center of the top of the shift push plate 6. The protrusion divides the recess into a front chamber and a rear chamber. An elastic element 5 is arranged in each of the front chamber and the rear chamber.

[0030] A shift push button installation groove for accommodating the shift assembly is formed in the upper surface of the casing 1. The shift push plate 6 is arranged in the shift push button installation groove. The push handle of the shift push button 3 extends out of the shift push button installation groove. A shift push button steel wire 4 for supporting the shift push button 3 is further arranged at the bottom of the shift push button 3.

[0031] The bottom of the shift push button 3 is provided with a front end face and a rear end face. The front and rear ends of the elastic element 5 located in the front chamber respectively abut against the front end face of the bottom of the shift push button 3 and the protrusion of the shift push plate 6. The front and rear ends of the elastic element 5 located in the rear chamber respectively abut against the protrusion of the shift push plate 6 and the rear end face of the bottom of the shift push button 3.

[0032] The elastic element 5 is preferably a cylindrical spring.

[0033] The bottom of the shift push plate 6 is provided with a shift wire mounting groove 7, and the top of the shift wire 8 is rotatably arranged in the shift wire mounting groove 7.

[0034] The top of the shift wire 8 is hingedly connected with the bottom of the shift push plate 6, the middle part of the shift wire 8 is rotatably connected with the outer wall of the gear box 11, and the bottom of the shift wire 8 extends into the gear box 11 and is connected with the shift gear ring 15.

[0035] The shift wire 8 is composed of a hinged part at the top, a rotating part in the middle and a pushing part at the bottom, the hinged part is hingedly connected with the shift wire mounting groove 7, the rotating part includes a rotating ring arranged on the fixed shaft 9 on both sides of the gear box 11, and the pushing part is a connecting hook which extends into the arc-shaped groove 10 on both sides of the gear box 11 and is fixedly connected with the shift gear ring 15 on both sides.

[0036] The length of the arc-shaped groove 10 is slightly larger than the movement path of the pushing part, and the curvature of the arc-shaped groove 10 matches the rotation curvature of the pushing part.

[0037] The working principle of the utility model is as follows:

[0038] Referring to Figures 1-7 When it is necessary to shift, the shift push button 3 is pushed to the corresponding gear position, if the shift gear ring 15 and the static gear ring to be connected at this moment are matched with each other, the shift push button 3 directly pushes the shift push plate 6 to move axially through the elastic element 5, so as to further drive the shift wire 8 to rotate around the fixed shaft 9 through the lever principle, and then the pushing part of the shift wire 8 drives the shift gear ring 15 to move towards the corresponding static gear ring and mesh, at this moment, the shift gear ring 15 can directly and successfully realize the connection with the corresponding static gear ring, so as to complete the high-low speed switching of the electric drill.

[0039] If the shift gear ring 15 and the static gear ring to be connected temporarily abut against each other when shifting, since the shift push button 3 and the shift push plate 6 are in differential relationship, the shift push button 3 can be pushed to the corresponding gear position in advance, and the elastic element 5 on the corresponding side is compressed and stored, and at this moment, the electric drill is in the working state, and the shift gear ring 15 and the static gear ring to be connected are in the moving state, so the point where the shift gear ring 15 and the static gear ring to be connected abut against each other can be automatically avoided, and the compressed elastic element 5 can push the shift push plate 6 to move axially through the elastic force at this moment, so as to further drive the shift wire 8 to rotate around the fixed shaft 9 through the lever principle, and then the pushing part of the shift wire 8 drives the shift gear ring 15 to move towards the corresponding static gear ring and mesh, at this moment, the shift gear ring 15 can successfully realize the connection with the corresponding static gear ring after the shift push button 3 is in place, so as to complete the high-low speed switching of the electric drill.

[0040] The above merely describes preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A high-low speed adjusting mechanism of a double-speed electric drill, characterized by: The gear box (11) is fixedly arranged inside the casing (1), the push button assembly is slidably connected to the upper surface of the casing (1), and the shift wire (8) is used to drive the high-low speed gear shifting of the gear box (11). The push button assembly comprises a shift push button (3), an elastic element (5) and a shift push plate (6), the shift push button (3) is slidably connected to the upper surface of the casing (1), a push handle is arranged at the center of the top of the shift push button (3), a recess for accommodating the elastic element (5) is arranged at the bottom of the shift push button (3), the shift push plate (6) is slidably connected to the bottom of the shift push button (3), a protrusion is arranged at the center of the top of the shift push plate (6), the protrusion divides the recess into a front chamber and a rear chamber, and the elastic element (5) is arranged in each of the front chamber and the rear chamber. The bottom of the shift push button (3) is provided with a front end face and a rear end face, the front and rear ends of the elastic element (5) arranged in the front chamber are respectively in abutment with the front end face of the bottom of the shift push button (3) and the protrusion of the shift push plate (6). The front and rear ends of the elastic element (5) arranged in the rear chamber are respectively in abutment with the protrusion of the shift push plate (6) and the rear end face of the bottom of the shift push button (3). The top of the shift wire (8) is hingedly connected to the bottom of the shift push plate (6), the middle of the shift wire (8) is rotatably connected to the outer wall of the gear box (11), and the bottom of the shift wire (8) extends into the gear box (11) and is connected with a shift gear ring (15).

2. The high-low speed adjusting mechanism of a double-speed electric drill according to claim 1, characterized in that: The gear box (11) is provided with a high-speed gear ring (14) at the front end, the shift gear ring (15) at the middle and a low-speed gear ring (13) at the rear end.

3. The high-low speed adjusting mechanism of a double-speed electric drill according to claim 1, characterized in that: The bottom of the shift push plate (6) is provided with a shift wire mounting groove (7), and the top of the shift wire (8) is rotatably arranged in the shift wire mounting groove (7).

4. The high-low speed adjusting mechanism of a double-speed electric drill according to claim 3, characterized in that: The shift wire (8) comprises a hinged part at the top, a rotating part at the middle and a pushing part at the bottom, the hinged part is hingedly connected to the shift wire mounting groove (7), the rotating part comprises a rotating ring arranged around the fixed shaft (9) on both sides of the gear box (11), the pushing part is a connecting hook, and the connecting hook extends into the arc-shaped grooves (10) on both sides of the gear box (11) and is fixedly connected to both sides of the shift gear ring (15).

5. The high-low speed adjusting mechanism of a double-speed electric drill according to claim 4, characterized in that: The length of the arc-shaped grooves (10) is slightly greater than the movement path of the pushing part, and the curvature of the arc-shaped grooves (10) matches the rotating curvature of the pushing part.

6. The high-low speed adjusting mechanism of a double-speed electric drill according to claim 1, characterized in that: The upper surface of the casing (1) is provided with a shift push button mounting groove for accommodating the push button assembly, the shift push plate (6) is arranged in the shift push button mounting groove, and the push handle of the shift push button (3) extends out of the shift push button mounting groove.

7. The high-low speed adjusting mechanism of a double-speed electric drill according to claim 1, characterized in that: The shift knob (3) bottom is further provided with a shift knob steel wire (4) for supporting the shift knob (3).

8. The high-low speed adjusting mechanism of a double-speed electric drill according to claim 1, characterized in that: The elastic element (5) is a cylindrical spring.

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