CN107471164A - Torque output tool - Google Patents

Abstract

The invention discloses a torque output tool, which comprises: an output shaft, a motor, a casing, a planetary gear set, an inner ring gear and an adjusting part; the output shaft is used for outputting torque, and the motor is used for driving the output shaft with a first axis For shaft rotation, the housing is used to accommodate the motor, the planetary gear set includes planetary gears and a planetary gear carrier for mounting the planetary gears, the inner ring gear is in mesh with the planetary gears and can rotate relative to the housing When the first axis rotates, the adjusting member forms a sliding connection with the housing in the axial direction and can slide to a position where the rotation of the ring gear is locked and another position where the rotation of the ring gear is released; The housing is further formed with: a limiting structure, which is used to limit the circumferential position of the adjusting member. The fixing force required by the ring gear of the torque output tool can be provided directly by the housing instead of the gear box, so that the strength of the whole machine can be improved, and the wear on the gear box can also be reduced.

Description

Torque output tool

technical field

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

Background technique

Torque output tools such as electric drills and screwdrivers generally include: housings, motors, transmissions, gear boxes, and output shafts. Wherein, 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 to output torque.

In order to enable the torque output tool to be in different gears with different output speeds, usually, the existing torque output tool will also be provided with a swing frame for speed adjustment. The fixing force generated by the ring gear during the working process of the torque output tool is provided by the gear box. However, as the torque of the electric drill increases, the structure of the gearbox is no longer sufficient to provide reliable and safe fixed support. At this time, everyone has adopted a split-type metal locking ring structure, and the structure becomes complicated and the cost increases.

Contents of the invention

A torque output tool, comprising: an output shaft, a motor, a casing, a planetary gear set, an inner ring gear and an adjustment member; the output shaft is used to output torque, and the motor is used to drive the output shaft to rotate around a first axis, The housing is used to accommodate the motor, the planetary gear set includes planetary gears and a planetary gear carrier for mounting the planetary gears, the ring gear is in mesh with the planetary gears and can rotate around the first planetary gear relative to the housing. The axis rotates, and the adjustment member forms an axial sliding connection with the housing and can slide to a position where the ring gear is locked and rotated and another position where the ring gear is released; the housing A limiting structure is also formed, and the limiting structure is used to limit the circumferential position of the adjusting member.

Further, the torque output tool further includes: a gear box for accommodating the ring gear; the adjusting member is at least partly located outside the gear box; the adjusting member further includes: a locking portion, which is used for Cooperate with the inner ring gear to lock or release the rotation of the inner ring gear.

Further, the adjusting part further includes: an adapter part, which is used to cooperate with the limiting structure to fix the circumferential position of the adjusting part relative to the housing; the adapting part is located at the outside the gearbox.

Further, the gear box is formed with a gap connecting the inside and the outside of the gear box; the locking part passes through the gap.

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

Further, the limiting structure is a groove formed inside the housing, and the adapter part is a protruding block that can be inserted into the groove, wherein the protruding block can be inserted into the groove slide axially.

Alternatively, the limiting structure is a pair of ribs formed inside the housing, and the adapter part is a protruding block that can be clamped between the pair of ribs; wherein, the protruding block Axially slidable between a pair of said ribs.

Further, the torque output tool further includes: an operating part, the operating part includes an operating part that exposes the housing for user operation; the adjusting part also includes: a gear part, the gear part is used to cooperate with the operation Parts cooperate to move the adjustment part in 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 connecting parts; the bases are used for setting the locking part, the fitting part and/or the gear part, and the connecting parts are used for connecting adjacent of the two bases.

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

The circumferential position of the adjustment member in the torque output tool of the present invention is directly limited by the limit structure formed on the housing, so that the fixing force required by the inner ring gear can be directly provided by the housing instead of the gear box, Therefore, the strength of the whole machine can be improved, and the wear on the gear box can also be reduced.

Description of drawings

Fig. 1 is a structural schematic diagram of a torque output tool;

Fig. 2 is an internal view of the partial structure of the torque output tool in Fig. 1 after the housing is cut;

Fig. 3 is a perspective view of the gearbox, speed regulating device and output shaft in Fig. 2;

Fig. 4 is the sectional view of structure shown in Fig. 3 along A-A line;

Fig. 5 is a sectional view of the structure shown in Fig. 3 along the line B-B;

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

Fig. 7 is a structural schematic diagram of part of the housing and the adjusting member in Fig. 2;

Fig. 8 is an enlarged schematic view of a part of the region in Fig. 7;

Fig. 9 is a schematic structural view of a part of the housing in Fig. 7;

Fig. 10 is a schematic structural view of the adjusting member in Fig. 7;

Fig. 11 is a structural schematic diagram of the adjusting member and the rear case of the gearbox in Fig. 3 .

detailed description

The present invention will be specifically introduced below in conjunction with the accompanying drawings and specific embodiments.

The torque output tool 100 shown in FIG. 1 is capable of outputting torque, and may be, for example, an electric drill, a screwdriver and other tools. In this embodiment, an electric drill may be used as an example.

As shown in FIGS. 1 to 5 , the torque output tool 100 includes: a housing 11 , a motor 12 , a switch 13 , a transmission device 20 , a gearbox 14 , an output shaft 15 and a speed regulating device 30 . For the electric drill, the torque output tool 100 can also include a torque adjusting device 16 and a chuck device 17, wherein the torque adjusting device 16 can include a torque cup 161 for the user to operate to adjust the maximum output torque of the output shaft 15, and the clamp The head device 17 is connected to the output shaft 15, and the collet device 17 is used for clamping accessories such as drill bits.

The casing 11 may be formed with a receiving portion 111 and a handle portion 112 , wherein the receiving portion 111 is used to accommodate the motor 12 , and the handle portion 112 is used to be held by a user. The housing 11 together with the torque cup 161 and the collet device 17 can form the shape of the torque output tool 100 . The motor 12 is disposed in the housing 11 , and the motor 12 is used to drive the output shaft 15 to rotate relative to the housing 11 around the first axis 101 . For an electric drill, the motor 12 can be a motor. The switch 13 is installed on the casing 11 , and the switch 13 is used to start the motor 12 when operated by a user, so that the torque output tool 100 is in a power-on state.

In order to facilitate the description of the technical solution of the present invention, the axial direction, circumferential direction and radial direction with the first axis 101 as the central axis that can be understood by those skilled in the art are also defined, wherein the axial direction includes not only the direction of the first axis 101 but also the direction of the first axis 101 A direction parallel to the first axis 101 . In addition, the side facing the chuck device 17 in the axial direction is defined as the front side, and the side away from the chuck device 17 is defined as the rear side.

The transmission device 20 is used to achieve transmission 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 to accommodate the transmission device 20 , and the output shaft 15 is used to output torque driven by the transmission device 20 .

As shown in FIGS. 1 to 6 , the transmission device 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 inner ring gear 25 . Wherein, the ring gear 25 can rotate around the first axis 101 relative to the housing 11 , and the axial position of the ring gear 25 in the gear box 14 is fixed. The gear box 14 is fixedly arranged in the casing 11 , the gear box 14 includes a rear shell 141 and a front shell 142 which can be combined together, and the transmission device 20 is arranged in the area surrounded by the rear shell 141 and the front shell 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 to say, 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 can respectively rotate with the rotation of the motor 12 . The first-stage sun gear 21 includes an engagement portion 211 and an extension portion 212 , and the engagement portion 211 and the extension portion 212 are respectively formed at different axial positions of the first-stage sun gear 21 . The meshing portion 211 is formed with meshing teeth for power transmission, and the extension portion 212 can be used for installing the sun gear 22 . The sun gear 22 is installed 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 power transmission, and the meshing teeth of the sun gear 22 The tooth profile 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 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 more than that 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. The first-stage planetary wheel 231 is also connected to the first-stage planetary gear carrier 232. The meshing portion 211 of the first-stage sun gear 21 forms a mesh. The planetary gear set 24 includes a planetary gear 241 and a planetary gear frame 242 , the planetary gear 241 is rotatably mounted on the planetary gear frame 242 , and the planetary gear 241 is also meshed with the sun gear 22 . Internal teeth 251 are formed on the inner periphery of the ring gear 25 , and the first-stage planetary gear 231 and the planetary gear 241 are both disposed in the ring gear 25 and can mesh with the ring gear 25 at the same time.

The first-stage planetary gear carrier 232 and the ring gear 25 are rotatably arranged in the gearbox 14, and the first-stage planetary gear carrier 232 is at least partially located between the motor 12 and the first-stage planetary gear 231 in the axial direction. . The planet carrier 242 also forms an output portion 242 a for outputting power to the output shaft 15 . In this embodiment, the transmission device 20 further includes a third-stage planetary gear set 26 and a second ring gear 27 . The third-stage planetary gear set 26 is arranged between the planetary gear set 24 and the output shaft 15, 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 arranged on between the first-stage planetary gear set 23 and the third-stage planetary gear set 26 .

In this way, when the rotation of the ring gear 25 relative to the housing 11 is locked, the rotation of the first-stage planetary gear carrier 232 relative to the housing 11 is released. When the motor 12 starts, the motor 12 transmits power to the first-stage sun gear 21 , the first-stage sun gear 21 transmits power to the first-stage planetary gear 231, because the ring gear 25 is fixed, so the first-stage planetary gear 231 transmits power to the first-stage planetary gear carrier 232, but because the first The first-stage planetary gear carrier 232 is not connected to the output device, so the first-stage planetary gear carrier 232 only idles and does not perform power output. 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 will The power is transmitted to the planetary gear 241, because the ring gear 25 is fixed, so the planetary gear 241 transmits the power to the planetary gear carrier 242, so that the first-stage planetary gear set 23 and the planetary gear set 24 only have the planetary gear The group 24 plays a role of deceleration, so the output portion 242 a of the planetary gear carrier 242 outputs at high speed, that is, the first transmission ratio between the motor 12 and the output shaft 15 is relatively small. When the rotation of the first-stage planetary gear carrier 232 relative to the housing 11 is locked, the rotation of the ring gear 25 relative to the housing 11 is released. When the motor 12 is started, the motor 12 transmits power to the first-stage sun gear 21. The first stage sun gear 21 transmits power to the first stage planetary gear 231, because the first stage planetary gear carrier 232 is locked, the first stage planetary gear 231 transmits power to the ring gear 25, the ring gear 25 rotates, and at the same time , the motor 12 also transmits power to the sun gear 22 through the first-stage sun gear 21. At this time, for the planetary gear 241, it constitutes a dual-input transmission train with the sun gear 22 and the ring gear 25, so that The output portion 242 a of the planetary gear carrier 242 outputs at a low speed, that is, there is a relatively large second transmission ratio between the motor 12 and the output shaft 15 .

The speed adjusting device 30 is used to adjust the transmission 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 part 31 is used for user's operation, and the adjusting part 32 forms a sliding connection with the housing 11 . Driven by the operating member 31, when the adjusting member 32 slides relative to the housing 11, it can slide to the position where the inner ring gear 25 is locked and another position where the inner ring gear 25 is released to rotate, and the adjusting member 32 can also slide to lock the second ring gear. The position where the first-stage planetary gear carrier 232 rotates and another position where the rotation of the first-stage planetary wheel carrier 232 is released.

The adjusting member 32 includes: a locking part 321, which is at least partly located in the gearbox 14, so that the locking part 321 can cooperate with the ring gear 25 and the first-stage planetary gear carrier 232 to lock or release the ring gear 25 and the first-stage planetary gear carrier. The rotation of the primary planet carrier 232.

Correspondingly, the outer side of the inner ring gear 25 is formed with a ring gear limiting portion 252 that can contact the locking portion 321 to lock the rotation of the inner ring gear 25, and the first-stage planetary carrier 232 is formed with a locking portion that can contact the locking portion 321 to lock. The wheel carrier limiting portion 232a of the rotation of the first stage planet wheel carrier 232 . In this way, when the adjustment member 32 slides axially to the position where the locking portion 321 is in contact with the ring gear limiting portion 252, the rotation of the inner ring gear 25 is locked, and at the same time the rotation of the first stage planetary carrier 232 is released; and when When the adjusting member 32 slides axially to the position where the ring gear 25 is released and the locking portion 321 is in contact with the stop portion 232a of the wheel frame, the rotation of the first stage planetary wheel frame 232 is locked, while the rotation of the ring gear 25 is locked. freed. 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 planetary gear carrier 232, thereby realizing different transmission ratios between the motor 12 and the output shaft 15 , so that the torque output tool 100 can be in different gears with different output speeds.

As shown in FIG. 4 , FIG. 7 to FIG. 9 , the adjusting member 32 is at least partially located outside the gear box 14 , and the circumferential position of the adjusting member 32 is also restricted by the housing 11 . Specifically, the casing 11 forms a limiting structure 113 , and the limiting structure 113 is used to limit the circumferential position of the adjusting member 32 . In this way, when the motor 12 is started, the locking portion 321 of the adjusting member 32 is in contact with the ring gear limiting portion 252 of the ring gear 25 or the carrier limiting portion 232a of the first-stage planetary carrier 232, and the ring gear 25 or the second stage The first-stage planetary 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 transferring to the The gear box 14, so that the fixing force of the ring gear 25 or the first-stage planetary carrier 232 can be directly provided by the housing 11, thereby improving the reliability of the strength of the adjusting member 32 and not causing any damage to the structure of the gear box 14. wear and tear.

Wherein, the adjusting member 32 further includes: an adapting portion 322 located outside the gear box 14 , and the adapting portion 322 is used to cooperate with the limiting structure 113 so as to fix the circumferential position of the adjusting member 32 relative to the housing 11 . Specifically, in this embodiment, the limiting structure 113 can be a pair of ribs 113a, 113b formed inside the housing 11, the ribs 113a, 113b extend generally along the axial direction, and a pair of ribs 113a, 113b is formed between a pair of ribs 113a, 113b. Clamping space, the adapter part 322 can specifically be a protruding block that can be clamped between a pair of ribs 113a, 113b, and the protruding block can be in the clamping space formed between a pair of ribs 113a, 113b Sliding in the axial direction, while the protruding block is restricted by a pair of ribs 113a, 113b in the circumferential direction and cannot rotate. Therefore, through the cooperation of the limiting structure 113 and the fitting part 322, the circumferential position of the adjustment member 32 relative to the housing 11 is limited but the axial position is not limited, and the torque of the transmission device 20 during the transmission process can be directly transmitted. To the housing 11, the reliability of the structure is improved. Of course, it can be understood that the limiting structure 113 can also be a groove formed inside the housing 11 , the protruding block can be inserted into the groove, and the protruding block can slide axially in the groove.

In order to cooperate with the operating part 31 , the adjusting part 32 further includes: a gear part 323 . As shown in Figures 1 and 5, the operating part 31 includes an operating part 311 that exposes the housing 11 for user operation, and the gear part 323 is used to cooperate with the operating part 31 so that the adjusting part 32 moves axially to lock or release the internal teeth. The rotational positions of the ring 25 and the first-stage planetary gear carrier 232 can further realize different gears with different output speeds of the torque output tool 100 .

Specifically, as shown in FIG. 10 and FIG. 11 , the adjusting member 32 further includes a base 324 and a connecting portion 325 , wherein the base 324 is used for setting the locking portion 321 , the matching portion 322 and/or the blocking portion 323 . The connecting portion 325 is used to realize the connection between two adjacent bases 324 , so that the whole formed by the connecting portion 325 and the bases 324 is roughly a ring structure, and the ring structure is located outside the gear box 14 and surrounds the gear box 14 The rear case 141 is set. The axial length of the base 324 may also be greater than the axial length of the connecting portion 325 , so as to increase the strength of the entire adjusting member 32 .

Wherein, the locking portion 321 is an inner protruding structure extending from the front edge of the base 324 to the inside of the ring structure. The notch 141 a through which the protruding structure passes, and the notch 141 a communicates the inside and the outside of the gear box 14 . Further, the notch 141a is open radially outwards and also axially rearward, so that when the adjusting member 32 moves forward in the axial direction, the locking portion 321 can be pushed by the edge of the notch 141a in the axial direction. When the adjusting member 32 moves backward in the axial direction, the locking portion 321 will not be limited by the notch 141a in the axial direction, and the user can disassemble the adjusting member 32 from the gear box 14 as required. In fact, in order to limit the backward movement of the adjustment member 32 in the axial direction after the torque output tool 100 is assembled, as shown in FIG. 32 back out of spacer 28 of gearbox 14.

As mentioned above, the fitting part 322 can be a protruding block, and the protruding block extends from the outside of the base 324 to the outside of the ring structure. The fitting part 322 and the locking part 321 can also be arranged on the same base 324, and they can be at the same circumferential position of the ring structure. However, in the axial direction, the fitting portion 322 and the locking portion 321 can be arranged at different axial positions of the base 324, and the locking portion 321 is closer to the output shaft 15 than the fitting portion 322 in the axial direction, so that the locking The axial dimension of the gearbox 14 can be reduced on the basis that the axial movement stroke of the portion 321 meets the requirements.

As mentioned above, the locking portion 321 is an inner protrusion structure, and the inner protrusion structure can extend from the outside of the gear box 14 through the notch 141 a to the inside of the gear box 14 . Wherein, in a circumferential direction passing through the notch 141a and the inner protrusion structure, the size of the notch 141a in the circumferential direction is also greater than or equal to the size of the inner protrusion structure in the circumferential direction, further speaking, the size of the notch 141a in the circumferential direction It is larger than the size of the inner protrusion structure in the circumferential direction, so that the locking part 321 and the notch 141a form a clearance fit in the circumferential direction, so that the torque generated by the transmission device 20 during the transmission process will not be transmitted to the gearbox through the locking part 321 14 is directly transmitted to the housing 11 through the adapter part 322.

The stop part 323 can be provided on another base 324 that is different from the adapter part 322 and the locking part 321, and the stop part 323 can be an outer protrusion protruding from the outside of the base 324 to the outside of the ring structure. structure. As shown in FIGS. 4 to 6 , the operating member 31 is also formed with a receiving groove 312 for inserting the outer protrusion structure. The receiving groove 312 extends approximately in the axial direction, and the outer protrusion structure is partially embedded in the receiving groove 312 . A pair of coil springs 33 are also arranged in the groove 312, respectively arranged on both sides of the outer protrusion structure.

The basic principles, main features and advantages of the present invention have been shown and described above. Those skilled in the industry should understand that the above-mentioned embodiments do not limit the present invention in any form, and all technical solutions obtained by means of equivalent replacement or equivalent transformation fall within the protection scope of the present invention.

Claims (10)

1. A torque output tool, comprising: The output shaft is used to output torque; a motor, configured to drive the output shaft to rotate about the first axis; a housing for housing the motor; A planetary gear set, including a planetary gear and a planetary gear carrier for installing the planetary gear; an inner ring gear meshing with the planetary gear and capable of rotating around the first axis relative to the housing; The torque output tool also includes: The adjustment member is in an axial sliding connection with the housing and can slide to a position where the ring gear is locked to rotate and another position where the ring gear is released to rotate; The housing is also formed with: The limiting structure is used to limit the circumferential position of the adjusting member. 2. The torque output tool according to claim 1, characterized in that: The torque output tool also includes: a gear box for receiving said ring gear; the adjustment member is located at least partially outside the gearbox; The regulator also includes: The locking part is used to cooperate with the inner ring gear to lock or release the rotation of the inner ring gear. 3. The torque output tool according to claim 2, characterized in that: The regulator also includes: an adapter part, configured to cooperate with the limiting structure to fix the circumferential position of the adjusting member relative to the housing; The adapting part is located outside the gear box. 4. The torque output tool according to claim 3, characterized in that: The gearbox is formed with: a gap connecting the inside and outside of the gearbox; The locking part passes through the notch. 5. The torque output tool according to claim 4, characterized in that: The locking portion and the fitting portion are located at different axial positions, and the locking portion is closer to the output shaft than the fitting portion in the axial direction. 6. The torque output tool according to claim 3, characterized in that: The limiting structure is a groove formed inside the housing, and the adapting part is a protruding block that can be inserted into the groove, wherein the protruding block can move along the axis in the groove. to swipe. 7. The torque output tool according to claim 3, characterized in that: The limiting structure is a pair of ribs formed inside the housing, and the adapting part is a protruding block that can be clamped between the pair of ribs; wherein, the protruding block can be A pair of ribs slide axially between them. 8. The torque output tool according to claim 3, characterized in that: The torque output tool also includes: An operating part, including an operating part exposed from the housing for user operation; The regulator also includes: The gear part is used for cooperating with the operating member to move the adjusting member in 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, characterized in that: The regulator also includes: at least two bases for setting the locking part, the fitting part and/or the blocking part; The connecting part is used to connect two adjacent bases. 10. The torque output tool according to any one of claims 1 to 9, characterized in that: The torque output tool also includes: Chuck device, used to hold the drill bit; Wherein, the collet device is connected to the output shaft.