CN107471164B

CN107471164B - Torque output tool

Info

Publication number: CN107471164B
Application number: CN201610401948.7A
Authority: CN
Inventors: 王平; 茅国兴
Original assignee: Nanjing Chervon Industry Co Ltd
Current assignee: Nanjing Chervon Industry Co Ltd
Priority date: 2016-06-08
Filing date: 2016-06-08
Publication date: 2020-05-26
Anticipated expiration: 2036-06-08
Also published as: CN107471164A

Abstract

The invention discloses a torque output tool, comprising: the output shaft, the motor, the shell, the planetary gear set, the inner gear ring and the adjusting piece; the output shaft is used for outputting torque force, the motor is used for driving the output shaft to rotate by taking a first axis as a shaft, the shell is used for accommodating the motor, the planetary wheel set comprises planetary wheels and a planetary wheel carrier used for mounting the planetary wheels, an inner gear ring is meshed with the planetary wheels and can rotate around the first axis relative to the shell, and the adjusting piece and the shell are in axial sliding connection and can slide to a position for locking the inner gear ring to rotate and another position for releasing the inner gear ring to rotate when sliding; the housing is further formed with: and the limiting structure is used for limiting the circumferential position of the adjusting piece. The fixing force required by the inner gear ring of the torque output tool can be directly provided by the shell without being provided by the gear box, so that the strength of the whole machine can be improved, and the abrasion to the gear box can be reduced.

Description

Torque output tool

Technical Field

The invention relates to a torque output tool, in particular to an electric drill.

Background

Torque output tools, such as drills, screwdrivers, and the like, typically include: casing, motor, transmission, gear box and output shaft. The transmission device is arranged between the motor and the output shaft, the gear box is used for accommodating the transmission device, and the motor drives the output shaft to rotate through the transmission device so as to output torque.

In order to enable the torque output tool to be in different gears with different output speeds, in general, the existing torque output tool is further provided with a swing frame for realizing speed adjustment, and the fixing force generated by an inner gear ring of the torque output tool in the working process is provided by a gear box in a matching mode of the existing swing frame and the gear box. However, as the structure of the electric drill torque lifting gear box is not enough to provide reliable and safe fixed support, at this time, a split type metal locking ring structure is adopted, the structure becomes complicated, and the cost is increased.

Disclosure of Invention

A torque output tool, comprising: the output shaft, the motor, the shell, the planetary gear set, the inner gear ring and the adjusting piece; the output shaft is used for outputting torque force, the motor is used for driving the output shaft to rotate by taking a first axis as a shaft, the shell is used for accommodating the motor, the planetary wheel set comprises planetary wheels and a planetary wheel carrier used for mounting the planetary wheels, an inner gear ring is meshed with the planetary wheels and can rotate around the first axis relative to the shell, and the adjusting piece and the shell are in axial sliding connection and can slide to a position for locking the inner gear ring to rotate and another position for releasing the inner gear ring to rotate when sliding; the housing is further formed with: and the limiting structure is used for limiting the circumferential position of the adjusting piece.

Further, the torque output tool further comprises: a gear case for accommodating the ring gear; the adjusting piece is at least partially positioned outside the gear box; the adjusting member further includes: a locking portion for cooperating with the ring gear to lock or release rotation of the ring gear.

Further, the adjusting member further includes: the adapting part is used for being matched with the limiting structure so as to fix the circumferential position of the adjusting piece relative to the shell; the adapter is located outside the gear box.

Further, the gear case is formed with a gap communicating the inside and the outside of the gear case; the locking portion passes through the notch.

Further, the locking portion is located at a different axial position from the fitting portion, and the locking portion is closer to the output shaft than the fitting portion in the axial direction.

Further, limit structure is for forming in the inboard recess of casing, adaptation portion is for can imbed the protruding piece of recess, wherein, protruding piece can be in the recess is followed the axial and is slided.

Or the limiting structure is a pair of ribs formed on the inner side of the shell, and the adapting part is a protruding block which can be clamped between the pair of ribs; wherein the projecting block is axially slidable between the pair of ribs.

Further, the torque output tool further comprises: an operating member including an operating portion exposed from the housing for operation by a user; the adjusting member further includes: and the gear part is used for being matched with the operating part to enable the adjusting part to move along the axial direction so as to realize that the torque output tool is in different gears with different output speeds.

Further, the adjusting member further includes: at least two bases and a connecting portion; the base is used for arranging the locking part, the adapting part and/or the blocking part, and the connecting part is used for connecting two adjacent bases.

Further, the torque output tool further comprises: a chuck device for holding a drill bit; wherein the collet device is connected to the output shaft.

The circumferential position of the adjusting piece in the torque output tool is directly limited by the limiting structure formed on the shell, so that the fixing force required by the inner gear ring can be directly provided by the shell without being provided by the gear box, the strength of the whole machine can be improved, and the abrasion to the gear box can be reduced.

Drawings

FIG. 1 is a schematic view of a torque output tool;

FIG. 2 is an inside view of the torque output tool of FIG. 1 with the housing partially broken away;

FIG. 3 is a perspective view of the gearbox, speed adjustment device and output shaft of FIG. 2;

FIG. 4 is a cross-sectional view of the structure of FIG. 3 taken along line A-A;

FIG. 5 is a cross-sectional view of the structure of FIG. 3 taken along line B-B;

FIG. 6 is an exploded view of the structure shown in FIG. 3;

FIG. 7 is a schematic view of a portion of the housing and adjustment member of FIG. 2;

FIG. 8 is an enlarged schematic view of a portion of the area of FIG. 7;

FIG. 9 is a schematic view of a portion of the housing of FIG. 7;

FIG. 10 is a schematic view of the adjustment member of FIG. 7;

FIG. 11 is a schematic view of the adjustment member and gearbox backshell of FIG. 3.

Detailed Description

The invention is described in detail below with reference to the figures and the embodiments.

The torque output tool 100 shown in fig. 1 can output a torque, and a specific example thereof may be a tool such as a drill or a screwdriver, and in the present embodiment, a drill may be used as an example.

As shown in fig. 1 to 5, the torque output tool 100 includes: housing 11, motor 12, switch 13, transmission 20, gearbox 14, output shaft 15 and speed adjustment device 30. For a drill, the torque output tool 100 may further include a torque adjustment device 16 and a chuck device 17, wherein the torque adjustment device 16 may include a torque cup 161 operable by a user to adjust the maximum output torque of the output shaft 15, the chuck device 17 being connected to the output shaft 15, and the chuck device 17 being operable to hold an accessory such as a drill bit.

The housing 11 may be formed with an accommodating portion 111 and a handle portion 112, wherein the accommodating portion 111 is for accommodating the motor 12 and the handle portion 112 is for being held by a user. The housing 11 may form the outer shape of the torque output tool 100 together with the torque cup 161 and the collet assembly 17. A motor 12 is disposed within the housing 11, the motor 12 being configured to drive an output shaft 15 to rotate relative to the housing 11 about a first axis 101. For power drills, the motor 12 may be an electric motor. A switch 13 is mounted to the housing 11, the switch 13 being for activating the motor 12 when operated by a user, thereby causing the torque output tool 100 to be in an on state.

For convenience of explanation of the technical solution of the present invention, an axial direction, a circumferential direction and a radial direction which are understood by those skilled in the art and take the first axis 101 as a central axis are also defined, wherein the axial direction includes not only the first axis 101 direction but also a direction parallel to the first axis 101. It is further defined that the side axially facing the chuck means 17 is a front side and the side facing away from the chuck means 17 is a rear side.

The transmission device 20 is used for transmitting power between the motor 12 and the output shaft 15, so as to drive the output shaft 15 to rotate around the first axis 101. The gear box 14 is used for accommodating the transmission 20, and the output shaft 15 is used for outputting torque under the driving of the transmission 20.

As shown in fig. 1 to 6, the transmission 20 may include: a first stage sun gear 21, a sun gear 22, a first stage planetary gear set 23, a planetary gear set 24, and an annulus gear 25. Wherein the ring gear 25 is rotatable relative to the housing 11 about the first axis 101 and the ring gear 25 is fixed in axial position within the gear box 14. The gear box 14 is fixedly disposed in the housing 11, the gear box 14 includes a rear case 141 and a front case 142 that can be combined together, and the transmission 20 is disposed in an area surrounded by the rear case 141 and the front case 142.

The first stage planetary gear set 23 is disposed on a side of the planetary gear set 24 away from the output shaft 15, that is, the first stage planetary gear set 23 is closer to the motor 12 than the planetary gear set 24. The first stage sun gear 21 and the sun gear 22 are respectively rotatable in accordance with rotation of the motor 12. The first-stage sun gear 21 includes an engaging portion 211 and an extending portion 212, and the engaging portion 211 and the extending portion 212 are formed at different axial positions of the first-stage sun gear 21, respectively. The engaging portion 211 is formed with engaging teeth for transmitting power, and the extension 212 may be used for mounting the sun gear 22. The sun gear 22 is mounted on the extension 212 of the first stage sun gear 21 and can rotate synchronously with the first stage sun gear 21, the sun gear 22 is also formed with meshing teeth for transmitting power, and the tooth profile of the meshing teeth of the sun gear 22 is the same as that of the meshing teeth of the first stage sun gear 21. In addition, the radius of the addendum circle of the sun gear 22 is also larger than the radius of the addendum circle of the first-stage sun gear 21, which makes the number of meshing teeth of the sun gear 22 larger than the number of meshing teeth of the first-stage sun gear 21.

The first-stage planetary gear set 23 includes a first-stage planetary gear 231 and a first-stage planetary gear carrier 232, the first-stage planetary gear 231 is rotatably mounted to the first-stage planetary gear carrier 232, and the first-stage planetary gear 231 is also engaged with the engaging portion 211 of the first-stage sun gear 21. The planetary gear set 24 includes planetary gears 241 and a planetary gear carrier 242, the planetary gears 241 being rotatably mounted to the planetary gear carrier 242, the planetary gears 241 also being in meshing engagement with the sun gear 22. The inner periphery of the ring gear 25 is formed with internal teeth 251, and the first-stage planetary gears 231 and the planetary gears 241 are both disposed within the ring gear 25 and can be simultaneously meshed with the ring gear 25.

The first stage carrier 232 and the annulus gear 25 are both rotatably disposed within the gear box 14, and the first stage carrier 232 is also at least partially located axially between the motor 12 and the first stage planets 231. The carrier 242 is also formed with an output portion 242a for outputting power to the output shaft 15. In the present embodiment, the transmission 20 further includes a third stage planetary gear set 26 and a second ring gear 27. The third stage planetary gear set 26 is disposed between the planetary gear set 24 and the output shaft 15, and the third stage planetary gear set 26 may include a third stage planetary gear 261 and a third stage planetary gear carrier 262, and the planetary gear set 24 is disposed between the first stage planetary gear set 23 and the third stage planetary gear set 26.

Thus, when the ring gear 25 is locked for rotation relative to the housing 11 and the first stage carrier 232 is released for rotation relative to the housing 11, the motor 12 transmits power to the first stage sun gear 21 and the first stage sun gear 21 transmits power to the first stage planet gears 231 when the motor 12 is started, the first stage planet gears 231 transmit power to the first stage carrier 232 because the ring gear 25 is stationary, but the first stage carrier 232 only idles and does not output power because the first stage carrier 232 is not connected to the output device, and at the same time, the motor 12 also transmits power to the sun gear 22 through the first stage sun gear 21 and the sun gear 22 transmits power to the planet gears 241 because the ring gear 25 is stationary, the planet gears 241 transmit power to the carrier 242, so that only the planet gear set 24 of the first stage planetary gear set 23 and the planetary gear set 24 at this time plays a role of speed reduction, the output portion 242a of the carrier 242 thus outputs at a high speed, i.e. with a relatively small first transmission ratio between the motor 12 and the output shaft 15. When the first-stage carrier 232 is locked to rotate relative to the housing 11 and the ring gear 25 is released to rotate relative to the housing 11, when the motor 12 is started, the motor 12 transmits power to the first-stage sun gear 21 and the first-stage sun gear 21 transmits power to the first-stage planet gears 231, because the first-stage carrier 232 is locked, the first-stage planet gears 231 transmit power to the ring gear 25 and the ring gear 25 rotates, and meanwhile, the motor 12 also transmits power to the sun gear 22 through the first-stage sun gear 21, the planet gears 241 form a double-input transmission gear train with the sun gear 22 and the ring gear 25, so that the output part 242a of the carrier 242 outputs at a low speed, namely, a relatively large second transmission ratio is formed between the motor 12 and the output shaft 15.

The speed adjusting device 30 is for adjusting a gear ratio between the motor 12 and the output shaft 15, and the speed adjusting device 30 includes: an operating member 31 and an adjusting member 32. The operating member 31 is used for operation by a user, and the adjusting member 32 is slidably connected with the housing 11. The adjuster 32 is slidable relative to the housing 11 to a position to lock rotation of the ring gear 25 and to another position to release rotation of the ring gear 25, and the adjuster 32 is also slidable to a position to lock rotation of the first-stage carrier 232 and to another position to release rotation of the first-stage carrier 232, under drive of the operating member 31.

The adjusting member 32 includes: and a locking portion 321, the locking portion 321 being at least partially located within the gear case 14 so that the locking portion 321 can be made to engage with the ring gear 25 and the first stage carrier 232 to lock or release the rotation of the ring gear 25 and the first stage carrier 232.

Correspondingly, a gear ring limiting part 252 capable of contacting with the locking part 321 to lock the rotation of the gear ring 25 is formed at the outer side of the gear ring 25, and a wheel carrier limiting part 232a capable of contacting with the locking part 321 to lock the rotation of the first stage planet carrier 232 is formed at the first stage planet carrier 232. Thus, when the adjuster 32 slides in the axial direction to a position where the locking portion 321 contacts the ring gear stopper 252, the rotation of the ring gear 25 is locked while the rotation of the first-stage carrier 232 is released; and when the adjuster 32 is slid in the axial direction to a position where the ring gear 25 is released and the locking portion 321 is brought into contact with the carrier stopper portion 232a, the rotation of the first-stage carrier 232 is locked and the rotation of the ring gear 25 is released. In this way, when the adjusting member 32 slides in the axial direction, the adjusting member 32 can lock or release the rotation of the ring gear 25 and the first stage carrier 232, so as to realize different gear ratios between the motor 12 and the output shaft 15, thereby enabling the torque output tool 100 to be in different gears with different output speeds.

As shown in fig. 4, 7 to 9, the adjusting member 32 is located at least partially outside the gear case 14, and the circumferential position of the adjusting member 32 is also restricted by the housing 11. Specifically, the housing 11 is formed with a stopper structure 113, and the stopper structure 113 is used to limit the circumferential position of the adjuster 32. Thus, when the motor 12 is started, the locking portion 321 of the adjusting member 32 contacts the ring gear limiting portion 252 of the ring gear 25 or the carrier limiting portion 232a of the first stage carrier 232, the ring gear 25 or the first stage carrier 232 transmits the torque to the adjusting member 32 through the locking portion 321, and the circumferential position of the adjusting member 32 is limited by the housing 11, so that the adjusting member 32 can directly transmit the torque to the housing 11 without transmitting the torque to the gear box 14, and thus the fixing force of the ring gear 25 or the first stage carrier 232 can be directly provided by the housing 11, thereby improving the reliability of the strength of the adjusting member 32 and causing no abrasion to the structure of the gear box 14.

Wherein, regulating part 32 still includes: an adapting part 322, wherein the adapting part 322 is positioned outside the gear box 14, and the adapting part 322 is used for cooperating with the limiting structure 113 so as to fix the circumferential position of the adjusting piece 32 relative to the shell 11. Specifically, in the present embodiment, the limiting structure 113 may be a pair of ribs 113a and 113b formed inside the housing 11, the ribs 113a and 113b extend substantially in the axial direction, a clamping space is formed between the pair of ribs 113a and 113b, and the adapting portion 322 may be a protruding block capable of being clamped between the pair of ribs 113a and 113b, the protruding block being capable of sliding in the axial direction in the clamping space formed between the pair of ribs 113a and 113b, and the protruding block being restricted from rotating in the circumferential direction by the pair of ribs 113a and 113 b. Therefore, the circumferential position of the adjusting piece 32 relative to the housing 11 is limited and the axial position is not limited through the matching of the limiting structure 113 and the adapting part 322, so that the torsion of the transmission device 20 in the transmission process can be directly transmitted to the housing 11, and the reliability of the structure is improved. Of course, it is understood that the limiting structure 113 may also be a groove formed inside the housing 11, and the protruding block can be embedded into the groove and can slide in the groove along the axial direction.

For cooperation with the operating member 31, the adjusting member 32 further includes: a gear portion 323. As shown in fig. 1 and 5, the operating member 31 includes an operating portion 311 that exposes the housing 11 for operation by a user, and the gear portion 323 is used to cooperate with the operating member 31 to move the adjusting member 32 in the axial direction to a position that locks or releases the rotation of the ring gear 25 and the first-stage carrier 232, thereby realizing different gears of the torque output tool 100 with different output speeds.

Specifically, as shown in fig. 10 and 11, the adjusting member 32 further includes a base 324 and a connecting portion 325, wherein the base 324 is used for providing the locking portion 321, the adapting portion 322 and/or the shifting portion 323. The connecting portion 325 is used for connecting two adjacent pedestals 324, so that the connecting portion 325 and the pedestals 324 form a generally annular structure, and the annular structure is located outside the gear box 14 and is disposed around the rear shell 141 of the gear box 14. The axial length of the base 324 may also be greater than the axial length of the connecting portion 325, thereby enabling the strength of the entire adjuster 32 to be increased.

Wherein the locking portion 321 is an inner protruding structure extending from the front side edge of the base 324 to the inside of the annular structure, and in order to be matched with the inner protruding structure, the rear shell 141 of the gear box 14 is further formed with a notch 141a for allowing the inner protruding structure to pass through, and the notch 141a communicates the inside and the outside of the gear box 14. Further, the notch 141a is opened radially outward and also opened axially rearward, so that the locking portion 321 can be axially restrained by the edge of the notch 141a when the adjusting member 32 is moved axially forward, and the locking portion 321 is not axially restrained by the notch 141a when the adjusting member 32 is moved axially rearward, and the user can detach the adjusting member 32 from the gear case 14 as desired. In fact, in order to limit the rearward axial movement of the adjustment member 32 when the torque output tool 100 is assembled, a spacer 28 may be provided within the gear housing 14 to prevent the adjustment member 32 from disengaging rearward from the gear housing 14, as shown in fig. 5.

As described above, the adapter 322 may be a protruding block that extends from the outside of the base 324 to the outside of the ring structure. The adapter portion 322 and the locking portion 321 may also be provided on the same seat 324, and both may be at the same circumferential location of the annular structure. However, the fitting portion 322 and the locking portion 321 may be disposed at different axial positions of the base 324 in the axial direction, and the locking portion 321 is closer to the output shaft 15 than the fitting portion 322 in the axial direction, so that the axial dimension of the gear box 14 can be reduced while ensuring that the stroke of the locking portion 321 moving in the axial direction meets the requirement.

As described above, the locking portion 321 has an inward projection structure that can extend from the outside of the gear case 14 to the inside of the gear case 14 through the notch 141 a. In a circumferential direction passing through the notch 141a and the inner protruding structure, the dimension of the notch 141a in the circumferential direction is also greater than or equal to the dimension of the inner protruding structure in the circumferential direction, and further, the dimension of the notch 141a in the circumferential direction is greater than the dimension of the inner protruding structure in the circumferential direction, so that the locking portion 321 and the notch 141a form a clearance fit in the circumferential direction, and further, a torsion generated by the transmission device 20 during transmission is not transmitted to the gear box 14 through the locking portion 321 but is directly transmitted to the housing 11 through the adapting portion 322.

The stopper portion 323 may be provided on another one of the seats 324, which is different from the arrangement of the fitting portion 322 and the locking portion 321, and the stopper portion 323 may be a male protrusion structure protruding from the outside of the seat 324 to the outside of the ring structure. As shown in fig. 4 to 6, the operating member 31 is further formed with a receiving groove 312 into which the outer projecting structure is inserted, the receiving groove 312 extends substantially in the axial direction, the outer projecting structure is partially inserted into the receiving groove 312, and a pair of coil springs 33 are disposed in the receiving groove 312 on both sides of the outer projecting structure.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by using equivalent alternatives or equivalent variations fall within the scope of the present invention.

Claims

1. A torque output tool, comprising:

an output shaft for outputting torque;

the motor is used for driving the output shaft to rotate by taking a first axis as a shaft;

a housing formed with an accommodating portion for accommodating the motor and a handle portion for being held by a user;

the planetary wheel set comprises a planetary wheel and a planetary wheel carrier used for mounting the planetary wheel;

the inner gear ring is meshed with the planet gear and can rotate around the first axis relative to the shell;

the torque output tool further comprises:

an adjusting member that constitutes a sliding connection in an axial direction with the housing and that is slidable to a position that locks rotation of the ring gear and another position that releases rotation of the ring gear when sliding, the adjusting member further comprising: a locking portion for cooperating with the ring gear to lock or release rotation of the ring gear;

a gear ring limiting part which can be contacted with the locking part to lock the rotation of the inner gear ring is formed on the outer side of the inner gear ring;

the housing is further formed with:

and the limiting structure is used for limiting the circumferential position of the adjusting piece.

2. A torque output tool according to claim 1, wherein:

the torque output tool further comprises:

a gear case for accommodating the ring gear;

the adjusting piece is at least partially positioned outside the gear box.

3. A torque output tool according to claim 2, wherein:

the adjusting member further includes:

the adapting part is used for being matched with the limiting structure so as to fix the circumferential position of the adjusting piece relative to the shell;

the adapter is located outside the gear box.

4. A torque output tool according to claim 3, wherein:

the gear case is formed with:

a notch communicating the inside and outside of the gear case;

the locking portion passes through the notch.

5. A torque output tool according to claim 4, wherein:

the locking part and the adapting part are located at different axial positions, and the locking part is closer to the output shaft relative to the adapting part in the axial direction.

6. A torque output tool according to claim 3, wherein:

the limiting structure is a groove formed in the inner side of the shell, the adapting part is a protruding block capable of being embedded into the groove, and the protruding block can slide in the groove along the axial direction.

7. A torque output tool according to claim 3, wherein:

the limiting structure is a pair of ribs formed on the inner side of the shell, and the adapting part is a protruding block which can be clamped between the pair of ribs; wherein the projecting block is axially slidable between the pair of ribs.

8. A torque output tool according to claim 3, wherein:

the torque output tool further comprises:

an operating member including an operating portion exposed from the housing for operation by a user;

the adjusting member further includes:

and the gear part is used for being matched with the operating part to enable the adjusting part to move along the axial direction so as to realize that the torque output tool is in different gears with different output speeds.

9. The torque output tool according to claim 8, wherein:

the adjusting member further includes:

at least two bases for providing the locking portion, the fitting portion and/or the stopper portion;

and the connecting part is used for connecting two adjacent bases.

10. A torque output tool according to any of claims 1 to 9, wherein:

the torque output tool further comprises:

the chuck device is used for clamping the drill bit;

wherein the collet device is connected to the output shaft.