A handheld electric drill reducer

Abstract

The invention discloses a handheld electric drill reducer, comprising an outer shell, a main shaft, a planetary gear reduction mechanism, an output shaft and a telescopic sleeve arranged in the outer shell, the planetary gear reduction mechanism comprising a central gear shaft, a plurality of double-linked planetary gears, an internal gear and a second planetary disk, the main shaft is fixedly connected to the central gear shaft, the main shaft, the central gear shaft and the outer shell are coaxial, a plurality of double-linked planetary gears are uniformly distributed circumferentially with the central gear shaft as the central axis, a coaxial first gear and a second gear are arranged on the double-linked planetary gear, the diameter of the first gear is smaller than the second gear, the first gear meshes with the gear on the central gear shaft, the internal gear is fixedly connected to the inner wall of the outer shell, the second gear meshes with the internal gear, one end of the shaft of the double-linked planetary gear is fixedly connected to the second planetary disk, the second planetary disk is fixedly connected to one end of the output shaft, the telescopic sleeve is fixedly connected to the other end of the output shaft, and the outer wall of the telescopic sleeve contacts the inner wall of the front sleeve. The handheld electric drill reducer of the invention has stable transmission.

Description

Technical Field

[0001] The invention relates to the technical field of electric drills, in particular to a handheld electric drill reducer. Background Art

[0002] A handheld electric drill is a commonly used mechanical equipment. In order to ensure the safety of users in different working environments and the stability of the handheld electric drill, some working environments require the speed of the handheld electric drill to be appropriately reduced to increase the torque of the drill bit. Therefore, it is particularly necessary to design a reduction device for a handheld electric drill with a suitable transmission ratio. Summary of the invention

[0003] The purpose of the present invention is to provide a handheld electric drill reducer to solve the problems existing in the above-mentioned prior art. Under the premise of not changing the rotation speed of the motor of the existing handheld electric drill, the output speed of the handheld electric drill is reduced, and a special planetary reducer layout is adopted to achieve the special requirement of a transmission ratio between 2 and 3.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] The present invention provides a handheld electric drill reducer, comprising an outer shell, the outer shell comprising a front sleeve and a tail sleeve connected by threads, a main shaft, a planetary gear reduction mechanism, an output shaft and a telescopic sleeve are sequentially arranged inside the outer shell from the tail sleeve to the front sleeve, the planetary gear reduction mechanism comprises a central gear shaft, a plurality of double-linked planetary gears, an internal gear and a second planetary disk, the main shaft is fixedly connected to the central gear shaft, the main shaft, the central gear shaft and the outer shell are coaxial, a plurality of double-linked planetary gears are uniformly distributed circumferentially with the central gear shaft as the central axis, a coaxial first gear and a second gear are arranged on the double-linked planetary gear, the diameter of the first gear is smaller than that of the second gear, the first gear is meshed with a gear on the central gear shaft, the internal gear is fixedly connected to the inner wall of the outer shell, the second gear is meshed with the internal gear, one end of the shaft of the double-linked planetary gear is fixedly connected to the second planetary disk, the second planetary disk is fixedly connected to one end of the output shaft, the telescopic sleeve is fixedly connected to the other end of the output shaft, and the outer wall of the telescopic sleeve contacts the inner wall of the front sleeve.

[0006] Preferably, the double planetary gear is coaxial with the central gear shaft, and the tooth grooves of the first gear and the second gear in the same double planetary gear are aligned.

[0007] Preferably, the planetary gear reduction mechanism also includes a first planetary disk, the other end of the shaft of the double planetary gear is fixedly connected to the second planetary disk, and the first planetary disk is also fixedly connected to the second planetary disk through a plurality of planetary disk fixing pins, and the first planetary disk and the second planetary disk are both provided with holes corresponding to the planetary disk fixing pins and are both interference fit with the planetary disk fixing pins.

[0008] Preferably, it also includes an orifice retaining spring located between the tail sleeve and the front sleeve, one side of the orifice retaining spring is in contact with the surfaces of the front sleeve and the internal gear, and the other side is in contact with the tail sleeve, one end of the internal gear away from the orifice retaining spring is in contact with the circular step in the front sleeve, and the end of the internal gear close to the orifice retaining spring is provided with a lug inserted into the groove of the orifice retaining spring.

[0009] Preferably, the output shaft is provided with a first bearing and a second bearing, the outer ring of the first bearing and the outer ring of the second bearing are fixedly connected to the inner wall of the front sleeve, a bearing gasket and a skeleton oil seal are provided between the first bearing and the second bearing, one end of the central gear shaft is rotatably matched with the second planetary disk through a third bearing, and the other end is rotatably matched with the tail sleeve through a fourth bearing, and the outer surface of the outer ring of the fourth bearing is fitted with the inner step of the tail sleeve through the orifice retaining ring.

[0010] Preferably, a spring retaining ring is provided on the output shaft, a spring is provided between the telescopic sleeve and the spring retaining ring, three steel balls distributed circumferentially along the circumferential surface of the output shaft are provided between the output shaft and the inner wall of the telescopic sleeve, and a placement hole is provided on the outer wall of the output shaft corresponding to each steel ball.

[0011] Preferably, a gap groove is formed between the front sleeve and the tail sleeve, and a marking ring is provided on the gap groove.

[0012] Preferably, the gear on the central gear shaft has the same module as the internal gear.

[0013] Compared with the prior art, the handheld electric drill reducer of the present invention has the following technical effects:

[0014] The handheld electric drill reducer of the present invention can reduce the output speed of the handheld electric drill and increase the torque without changing the speed of the motor of the existing handheld electric drill. The handheld electric drill reducer of the present invention sets a double planetary gear in the planetary gear reduction mechanism. Compared with the single-gear planetary gear, it can reduce the number of times the gear tooth surface on the planetary gear contacts the tooth surface of the internal gear and the center gear in one working cycle, thereby reducing tooth surface wear and extending the service life of the gear; two planetary plates are used to make the double planetary gear load balanced and the transmission smooth; by flexibly changing the number of teeth of the double gear, a transmission ratio of less than 1:3 that is difficult to achieve with the traditional NGW type layout is achieved. The handheld electric drill reducer of the present invention has a compact structure, small size, small mass, stable transmission and strong load-bearing capacity, and uses a compact structure to achieve the special ability of a transmission ratio of no more than 3. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 The structure of the handheld electric drill reducer of the present invention is shown in FIG. Figure 1 ;

[0017] Figure 2 The structure of the handheld electric drill reducer of the present invention is shown in FIG. Figure 2 ;

[0018] Figure 3 This is an exploded view of the handheld electric drill reducer of the present invention;

[0019] Figure 4 It is a structural schematic diagram of the planetary gear reduction mechanism in the handheld electric drill reducer of the present invention;

[0020] Figure 5 It is an exploded view of the planetary gear reduction mechanism in the handheld electric drill reducer of the present invention;

[0021] Among them: 1- telescopic sleeve, 2- front sleeve, 3- tail sleeve, 4- main shaft, 5- output shaft, 6- sealing ring, 7- marking ring, 8- bearing retaining ring, 9- first bearing, 10- bearing gasket, 11- second bearing, 12- skeleton oil seal, 13- planetary gear reduction mechanism, 14- isolation ring, 15- orifice retaining ring, 16- third bearing, 17- internal gear, 18- friction plate, 19- first planetary disk, 20- second planetary disk, 21- double planetary gear, 22- planetary disk fixing pin, 23- center gear shaft, 24- fourth bearing. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] The purpose of the present invention is to provide a handheld electric drill reducer to solve the problems existing in the above-mentioned prior art and reduce the output speed of the handheld electric drill without changing the speed of the motor of the existing handheld electric drill.

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] like Figures 1 to 5 As shown: the handheld electric drill reducer of this embodiment includes an outer shell, which includes a front sleeve 2 and a tail sleeve 3 connected by threads, a gap groove is formed between the front sleeve 2 and the tail sleeve 3, a marking ring 7 is arranged on the gap groove, a sealing ring 6 is arranged between the front sleeve 2 and the marking ring 7, and the front sleeve 2, the marking ring 7 and the tail sleeve 3 constitute the outer shell.

[0026] The main shaft 4, the planetary gear reduction mechanism 13, the output shaft 5 and the telescopic sleeve 1 are arranged in sequence inside the outer casing from the tail sleeve 3 to the front sleeve 2. Among them, the planetary gear reduction mechanism 13 includes a central gear shaft 23, three double planetary gears 21, an internal gear 17 and a second planetary disk 20, the main shaft 4 is fixedly connected to the central gear shaft 23, the main shaft 4, the central gear shaft 23 and the outer casing are coaxial, the three double planetary gears 21 are evenly distributed in the circumferential direction with the central gear shaft 23 as the central axis, the double planetary gears 21 are coaxial with the central gear shaft 23, and the tooth grooves of the first gear and the second gear in the same double planetary gear 21 are aligned. The double planetary gear 21 is provided with a coaxial first gear and a second gear. The diameter of the first gear is smaller than that of the second gear. The first gear meshes with the gear on the central gear shaft 23. The gear on the central gear shaft 23 has the same module as the internal gear 17. The internal gear 17 is fixedly connected to the inner wall of the outer shell. The second gear meshes with the internal gear 17. One end of the shaft of the double planetary gear 21 is fixedly connected to the second planetary disk 20. The second planetary disk 20 is fixedly connected to one end of the output shaft 5. The telescopic sleeve 1 is fixedly connected to the other end of the output shaft 5. The outer wall of the telescopic sleeve 1 contacts the inner wall of the front sleeve 2. A spring retaining ring is sleeved on the output shaft 5. A spring is arranged between the telescopic sleeve 1 and the spring retaining ring. Three steel balls distributed circumferentially along the circumferential surface of the output shaft 5 are arranged between the output shaft 5 and the inner wall of the telescopic sleeve 1, and a placement hole is arranged on the outer wall of the output shaft 5 corresponding to each steel ball.

[0027] The planetary gear reduction mechanism 13 also includes a first planetary disk 19. The other end of the shaft of the double planetary gear 21 is fixedly connected to the second planetary disk 20. The first planetary disk 19 is also fixedly connected to the second planetary disk 20 through a plurality of planetary disk fixing pins 22. Both the first planetary disk 19 and the second planetary disk 20 are provided with holes corresponding to the planetary disk fixing pins 22 and are interference fit with the planetary disk fixing pins 22.

[0028] The handheld electric drill reducer of this embodiment also includes an orifice retaining spring 15 located between the tail sleeve 3 and the front sleeve 2. One side of the orifice retaining spring 15 is in contact with the surfaces of the front sleeve 2 and the internal gear 17, and the other side is in contact with the tail sleeve 3. One end of the internal gear 17 away from the orifice retaining spring 15 is in contact with the circular step in the front sleeve 2. One end of the internal gear 17 close to the orifice retaining spring 15 is provided with a lug inserted into the groove of the orifice retaining spring 15.

[0029] The output shaft 5 is sleeved with a first bearing 9 and a second bearing 11. The outer ring of the first bearing 9 and the outer ring of the second bearing 11 are fixedly connected to the inner wall of the front sleeve 2. A bearing washer 10 and a skeleton oil seal 12 are arranged between the first bearing 9 and the second bearing 11. A bearing retaining ring 8 is also arranged next to the first bearing 9. One end of the second bearing 11 contacts with the isolating ring 14 through the end face of the outer ring, and the other end face of the isolating ring 14 fits with the internal gear 17. The other end of the internal gear 17 is fitted with a friction plate 18. One end of the central gear shaft 23 is rotatably matched with the second planetary disk 20 through the third bearing 16, and the other end is rotatably matched with the tail sleeve 3 through the fourth bearing 24. The outer surface of the outer ring of the fourth bearing 24 fits with the inner step of the tail sleeve 3 through the orifice retaining ring 15.

[0030] The working process of the handheld electric drill reducer of this embodiment is as follows: the power source inputs power to the main shaft 4, so that the main shaft 4 rotates at a certain speed, and the main shaft 4 drives the central gear shaft 23 to rotate in the same direction at the same speed, and the central gear shaft 23 drives the three double planetary gears 21 to rotate around their own central axis; the second gear internal gear 17 on the double planetary gear 21 is gear meshing transmission, and the internal gear 17 is fixed, and then the double planetary gear 21 revolves around the central axis of the internal gear 17, and the revolving speed is lower than the central gear shaft 23, and the direction is consistent with the rotation direction of the central gear shaft 23; the first planetary disc 19 and the second planetary disc 20 are fixedly connected by the planetary disc fixing pin 22, and the first planetary disc 19 and the second planetary disc 20 are driven by the three double planetary gears 21 to revolve around their own central axis at the same speed and direction as the double planetary gear 21; the second planetary disc 20 rotates and drives the output shaft 5 to rotate in the same direction at the same speed; finally, the output shaft 5 outputs power at a speed consistent with the rotation direction of the main shaft 4 but lower than the rotation direction of the main shaft 4.

[0031] In the description of the present invention, it should be noted that the terms "center", "top", "bottom", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0032] The present specification uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A handheld electric drill reducer, characterized in that: The invention comprises an outer shell, wherein the outer shell comprises a front sleeve and a tail sleeve connected by threads, and a main shaft, a planetary gear reduction mechanism, an output shaft and a telescopic sleeve are sequentially arranged inside the outer shell from the tail sleeve to the front sleeve, and the planetary gear reduction mechanism comprises a central gear shaft, a plurality of double-linked planetary gears, an internal gear and a second planetary disk, the main shaft is fixedly connected to the central gear shaft, the main shaft, the central gear shaft and the outer shell are coaxial, and a plurality of double-linked planetary gears are uniformly distributed circumferentially with the central gear shaft as the central axis, and a coaxial first gear and a second gear are arranged on the double-linked planetary gear, the diameter of the first gear is smaller than that of the second gear, the first gear is meshed with the gear on the central gear shaft, the internal gear is fixedly connected to the inner wall of the outer shell, and the second gear is meshed with the internal gear, one end of the shaft of the double-linked planetary gear is fixedly connected to the second planetary disk, the second planetary disk is fixedly connected to one end of the output shaft, the telescopic sleeve is fixedly connected to the other end of the output shaft, and the outer wall of the telescopic sleeve contacts the inner wall of the front sleeve; The double planetary gear is coaxial with the central gear shaft, and the tooth grooves of the first gear and the second gear in the same double planetary gear are aligned; the planetary gear reduction mechanism also includes a first planetary disk, and the other end of the shaft of the double planetary gear is fixedly connected to the second planetary disk, and the first planetary disk is also fixedly connected to the second planetary disk through a plurality of planetary disk fixing pins, and the first planetary disk and the second planetary disk are both provided with holes corresponding to the planetary disk fixing pins and are both interference fit with the planetary disk fixing pins.

2. The handheld electric drill reducer according to claim 1, characterized in that: It also includes an orifice retaining spring located between the tail sleeve and the front sleeve, one side of the orifice retaining spring is in contact with the surfaces of the front sleeve and the internal gear, and the other side is in contact with the tail sleeve, one end of the internal gear away from the orifice retaining spring is in contact with the circular step in the front sleeve, and one end of the internal gear close to the orifice retaining spring is provided with a lug inserted into the groove of the orifice retaining spring.

3. The handheld electric drill reducer according to claim 2, characterized in that: The output shaft is sleeved with a first bearing and a second bearing, the outer rings of the first bearing and the second bearing are fixedly connected to the inner wall of the front sleeve, a bearing washer and a skeleton oil seal are arranged between the first bearing and the second bearing, one end of the central gear shaft is rotatably matched with the second planetary disk through a third bearing, and the other end is rotatably matched with the tail sleeve through a fourth bearing, and the outer surface of the outer ring of the fourth bearing is fitted with the inner step of the tail sleeve through the orifice retaining ring.

4. The handheld electric drill reducer according to claim 1, characterized in that: A spring retaining ring is sleeved on the output shaft, a spring is arranged between the telescopic sleeve and the spring retaining ring, three steel balls distributed circumferentially along the circumferential surface of the output shaft are arranged between the output shaft and the inner wall of the telescopic sleeve, and a placement hole is arranged on the outer wall of the output shaft corresponding to each steel ball.

5. The handheld electric drill reducer according to claim 1, characterized in that: A clearance groove is formed between the front sleeve and the tail sleeve, and a marking ring is arranged on the clearance groove.

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