Electric tool gearbox

Abstract

The utility model discloses an electric tool gearbox which comprises a lower cover and an upper cover covering the upper end face of the lower cover, the lower cover and the upper cover form a hollow cavity structure, a driving device is installed in the cavity, a servo motor for driving the driving device is installed at the bottom end of the lower cover, and the servo motor is connected with the lower cover. The output end of the servo motor extends into the lower cover and is provided with a first bevel gear, the driving device comprises a first driving mechanism, a second driving mechanism and a third driving mechanism, the first driving mechanism, the second driving mechanism and the third driving mechanism are arranged in the cavity in a delta shape, the first driving mechanism is meshed with the first bevel gear, and the second driving mechanism is meshed with the third bevel gear. By means of rotation of the first small bearing and the second small bearing, the phenomenon that the lower cover and the upper cover are abraded due to friction can be avoided, rapid installation is facilitated, the installation time is shortened, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of gearboxes, in particular to a gearbox for power tools. Background Technique

[0002] The gearbox of a power tool is a key component in a power tool, which is composed of a gear set, a shaft and a housing. When the motor drives the input shaft of the gearbox to rotate, the small gear on the input shaft meshes with the large gear on the output shaft. According to the basic principle of gear transmission, when the small gear drives the large gear to rotate, the output speed will decrease while the torque will increase. For example, when the motor speed is 10,000 revolutions per minute, after being decelerated by the gearbox, the output speed may be reduced to 500 - 1,500 revolutions per minute, and such a speed is suitable for power tools to perform operations such as drilling and cutting.

[0003] When installing the shaft in the existing gearbox, the shaft is usually inserted into a groove previously opened in the housing. The housing is composed of two separable shells, and the shaft is installed by fitting and limiting the shaft through the two shells. However, after the shaft works for a long time, the groove opened in the housing is severely damaged due to friction, which will cause the shaft to rotate unstably, affect the operation of the gearbox, and reduce the service life of the gearbox. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a gearbox for power tools, which has the advantages of stable structure and long service life, and solves the problem that the housing of the current gearbox is severely damaged due to friction after long-term use.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A gearbox for power tools, including a lower cover and an upper cover covering the upper end face of the lower cover. The lower cover and the upper cover form a cavity structure with a hollow interior. A driving device is installed in this cavity. A servo motor for driving the driving device is installed at the bottom end of the lower cover. The output end of the servo motor extends into the lower cover and is provided with a first helical gear. The driving device includes a first driving mechanism, a second driving mechanism and a third driving mechanism. Among them, the first driving mechanism, the second driving mechanism and the third driving mechanism are arranged in a triangular pyramid shape in the cavity. The first driving mechanism meshes with the first helical gear. The second driving mechanism meshes with the first driving mechanism and the third driving mechanism respectively. The top end of the third driving mechanism extends out of the upper end face of the upper cover, and positioning mechanisms are provided at the top ends of the first driving mechanism and the second driving mechanism.

[0006] Preferably, the first driving mechanism includes a first rotating shaft. First small bearings are arranged at both the upper and lower ends of the first rotating shaft. A second helical gear meshing with the first helical gear is arranged at the bottom end of the first rotating shaft. A first small gear meshing with the second driving mechanism is arranged on the upper end face of the second helical gear.

[0007] Preferably, the second driving mechanism includes a second rotating shaft. Second small bearings are arranged at both the upper and lower ends of the second rotating shaft. A first large gear meshing with the first driving mechanism is arranged at the bottom end of the second rotating shaft. A second small gear meshing with the third driving mechanism is arranged on the upper end face of the first large gear.

[0008] Preferably, the third driving mechanism includes a third rotating shaft. A third small bearing is arranged at the bottom end of the third rotating shaft. A second large gear meshing with the second driving mechanism is arranged in the middle of the third rotating shaft. A large bearing is arranged on the upper end face of the second large gear. The top end of the third rotating shaft penetrates through the upper cover from inside to outside.

[0009] Preferably, two positioning mechanisms are provided. Each positioning mechanism includes a positioning groove formed by downward depression. A limiting groove is opened at the bottom end of the positioning groove. A limiting block is rotatably installed in the limiting groove. A connecting rod fixed to the upper cover is installed at the top end of the limiting block.

[0010] Preferably, the vertical cross-section of the positioning groove is arc-shaped. The inner diameter value of this arc gradually decreases from top to bottom and is equal to the inner diameter value of the top end of the limiting block. The limiting block is spherical.

[0011] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0012] 1. By setting the first driving mechanism, the second driving mechanism and the third driving mechanism, and meshing the second driving mechanism with the first driving mechanism and the third driving mechanism, and driving the second driving mechanism to rotate by the first driving mechanism, the structure is stable. The first small bearings and the second small bearings installed at both ends of the first rotating shaft and the second rotating shaft can avoid direct contact with the lower cover and the upper cover when the first rotating shaft and the second rotating shaft rotate. The rotation of the first small bearings and the second small bearings can prevent the lower cover and the upper cover from being worn due to friction.

[0013] 2. By setting the positioning groove, the limiting groove, the limiting block and the connecting rod, and fixing the connecting rod in the upper cover, when the limiting block at the bottom end of the connecting rod descends and fits the inner wall of the positioning groove, and the positioning groove assists the limiting block to be embedded in the limiting groove, the auxiliary positioning during the installation of the first driving mechanism and the second driving mechanism can be completed, which is convenient for quick installation, shortens the installation time, and improves the production efficiency.

[0014] 3. By setting, the effect of has been achieved,.

[0015] 4. By setting, the effect of has been achieved,.

[0016] 5. By setting, the effect of has been achieved,. Description of the Drawings

[0017] Figure 1It is a front view structural schematic diagram of the present utility model;

[0018] Figure 2 It is a structural schematic diagram of the separated upper cover of the present utility model;

[0019] Figure 3 It is a disassembly schematic diagram of the present utility model;

[0020] Figure 4 It is a vertical sectional schematic diagram of the present utility model;

[0021] Figure 5 For the present utility model Figure 4 An enlarged schematic diagram of the structure at position A in it.

[0022] The reference numerals and names in the figure are as follows:

[0023] 1. Lower cover; 2. Upper cover; 3. Servo motor; 31. First helical gear; 4. Driving device; 5. First driving mechanism; 51. First rotating shaft; 52. First small bearing; 53. Second helical gear; 54. First small gear; 6. Second driving mechanism; 61. Second rotating shaft; 62. Second small bearing; 63. First large gear; 64. Second small gear; 7. Third driving mechanism; 71. Third rotating shaft; 72. Third small bearing; 73. Second large gear; 74. Large bearing; 8. Positioning mechanism; 81. Positioning groove; 82. Limiting groove; 83. Limiting block; 84. Connecting rod. Specific embodiments

[0024] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0025] In the description of the embodiments of the present utility model, it should be understood that the orientation or positional relationships indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the embodiments of the present utility model and for simplification, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present utility model, "a plurality" means two or more, unless otherwise specifically defined.

[0026] In the embodiments of the present utility model, unless otherwise clearly specified and defined, the terms "mounted", "connected", "coupled", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0027] Please refer to Figures 1 to 5, an embodiment provided by the present utility model: an electric tool gearbox, comprising a lower cover 1 and an upper cover 2 covering the upper end face of the lower cover 1. The lower cover 1 and the upper cover 2 form a cavity structure with a hollow interior. A driving device 4 is installed in the cavity. A servo motor 3 for driving the driving device 4 is installed at the bottom end of the lower cover 1. The output end of the servo motor 3 extends into the lower cover 1 and is provided with a first helical gear 31. The driving device 4 includes a first driving mechanism 5, a second driving mechanism 6, and a third driving mechanism 7. Among them, the first driving mechanism 5, the second driving mechanism 6, and the third driving mechanism 7 are arranged in a triangular pyramid shape in the cavity. The first driving mechanism 5 meshes with the first helical gear 31. The second driving mechanism 6 meshes with the first driving mechanism 5 and the third driving mechanism 7 respectively. The top end of the third driving mechanism 7 extends out of the upper end face of the upper cover 2. And positioning mechanisms 8 are provided at the top ends of the first driving mechanism 5 and the second driving mechanism 6. The first driving mechanism 5 includes a first rotating shaft 51. First small bearings 52 are provided at both the upper and lower ends of the first rotating shaft 51. And a second helical gear 53 meshing with the first helical gear 31 is provided at the bottom end of the first rotating shaft 51. A first small gear 54 meshing with the second driving mechanism 6 is provided on the upper end face of the second helical gear 53. The second driving mechanism 6 includes a second rotating shaft 61. Second small bearings 62 are provided at both the upper and lower ends of the second rotating shaft 61. And a first large gear 63 meshing with the first driving mechanism 5 is provided at the bottom end of the second rotating shaft 61. A second small gear 64 meshing with the third driving mechanism 7 is provided on the upper end face of the first large gear 63. The third driving mechanism 7 includes a third rotating shaft 71. A third small bearing 72 is provided at the bottom end of the third rotating shaft 71. And a second large gear 73 meshing with the second driving mechanism 6 is provided in the middle of the third rotating shaft 71. A large bearing 74 is provided on the upper end face of the second large gear 73. The top end of the third rotating shaft 71 penetrates the upper cover 2 from the inside to the outside. Two positioning mechanisms 8 are provided. Each positioning mechanism 8 includes a positioning groove 81 formed by downward depression. A limiting groove 82 is opened at the bottom end of the positioning groove 81. A limiting block 83 is rotatably installed in the limiting groove 82. A connecting rod 84 fixed to the upper cover 2 is installed at the top end of the limiting block 83. The vertical cross-section of the positioning groove 81 is arc-shaped. The inner diameter value of this arc gradually decreases from top to bottom and is equal to the inner diameter value of the top end of the limiting block 83. The limiting block 83 is spherical in shape.

[0028] Working principle: During the operation of the present utility model, the lower cover 1 is covered on the servo motor 3. The first small bearing 52 at the bottom end of the first rotating shaft 51 is embedded into the lower cover 1. After embedding, the first helical gear 31 and the second helical gear 53 mesh with each other. Then the second small bearing 62 at the bottom end of the second rotating shaft 61 is embedded into the lower cover 1. The first large gear 63 meshes with the first small gear 54. Then the third driving mechanism 7 is inserted. The second large gear 73 meshes with the second small gear 64 to drive the third rotating shaft 71 to rotate. Then the upper cover 2 is covered on the lower cover 1. The lower cover 1, the upper cover 2, and the servo motor 3 are locked and fixed by bolts to complete the assembly.

[0029] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above-mentioned exemplary embodiments, and the present utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present utility model. Any reference signs in the claims should not be construed as limiting the claims involved.

Claims

1. A power tool gear box, comprising a lower cover (1) and an upper cover (2) covering the upper end surface of the lower cover (1), characterized in that: The lower cover (1) and the upper cover (2) form an internal hollow cavity structure, in which a driving device (4) is installed. A servo motor (3) for driving the driving device (4) is installed at the bottom end of the lower cover (1). The output end of the servo motor (3) extends into the lower cover (1) and is provided with a first bevel gear (31). The driving device (4) comprises a first driving mechanism (5), a second driving mechanism (6) and a third driving mechanism (7), wherein the first driving mechanism (5), the second driving mechanism (6) and the third driving mechanism (7) are arranged in the cavity in a herringbone shape. The first driving mechanism (5) is meshed with the first bevel gear (31), and the second driving mechanism (6) is respectively meshed with the first driving mechanism (5) and the third driving mechanism (7). The top end of the third driving mechanism (7) extends out of the upper end surface of the upper cover (2), and the top ends of the first driving mechanism (5) and the second driving mechanism (6) are both provided with a positioning mechanism (8).

2. The electric tool gear box according to claim 1, characterized in that: The first driving mechanism (5) comprises a first rotating shaft (51), wherein first small bearings (52) are arranged at both upper and lower ends of the first rotating shaft (51), and a second bevel gear (53) meshing with the first bevel gear (31) is arranged at the bottom end of the first rotating shaft (51), and a first small gear (54) meshing with the second driving mechanism (6) is arranged on the upper end surface of the second bevel gear (53).

3. The electric tool gear box according to claim 1, characterized in that: The second driving mechanism (6) comprises a second rotating shaft (61), the upper and lower ends of the second rotating shaft (61) are both provided with second small bearings (62), and the bottom end of the second rotating shaft (61) is provided with a first large gear (63) meshing with the first driving mechanism (5), and the upper end surface of the first large gear (63) is provided with a second small gear (64) meshing with the third driving mechanism (7).

4. The electric tool gear box according to claim 1, characterized in that: The third driving mechanism (7) comprises a third rotating shaft (71), a third small bearing (72) is arranged at the bottom end of the third rotating shaft (71), a second large gear (73) meshing with the second driving mechanism (6) is arranged in the middle of the third rotating shaft (71), a large bearing (74) is arranged on the upper end surface of the second large gear (73), and the top end of the third rotating shaft (71) passes through the upper cover (2) from the inside to the outside.

5. The electric tool gear box according to claim 1, characterized in that: Two positioning mechanisms (8) are provided, each of the positioning mechanisms (8) comprises a positioning groove (81) which is recessed downwards, a limiting groove (82) is provided at the bottom end of the positioning groove (81), a limiting block (83) is rotatably installed in the limiting groove (82), and a connecting rod (84) fixed to the upper cover (2) is installed at the top end of the limiting block (83).

6. The electric tool gear box according to claim 5, characterized in that: The vertical cross section of the positioning groove (81) is arc-shaped, and the inner diameter of the arc gradually decreases from top to bottom and is equal to the inner diameter of the top end of the limiting block (83), and the limiting block (83) is arranged in a spherical shape.

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