CN210126046U - Electric and pneumatic tools transmission structure - Google Patents

Abstract

The utility model provides an electric and pneumatic tool transmission structure, which is mainly characterized in that a connecting seat is arranged in front of a machine body of an electric and pneumatic tool, a machine head, a traction piece and a knob are arranged on the connecting seat, the traction piece is utilized to be connected with a speed change gear ring of a speed change component placed in the connecting seat, so that the operation of the knob passing through the outside of the connecting seat can be carried out by the traction piece, the speed change gear ring generates the translation in the front and back directions, the speed change component also comprises a first planet carrier arranged in an inner ring part of the speed change gear ring and a second planet carrier and a fixed gear ring arranged in the connecting seat and positioned at the rear part of the speed change gear ring, and the first planet carrier continuously passes through the connecting seat and the machine head and extends out a central shaft at the front end of the machine head to output power, and a first clamping part is arranged on the speed change gear ring, a second embedded part is selected and arranged on the connecting seat or the fixed gear ring or the machine head.

Description

Electric and pneumatic tools transmission structure

technical field

The utility model relates to a transmission structure, in particular to a transmission structure of electric and pneumatic tools which is simpler and easier to change the speed change.

Background technique

At present, the common hand-held electric and pneumatic tools such as electric drilling machines and pneumatic drilling machines mainly have two design forms. The rotation speed is low; however, it is difficult to achieve the same electric and pneumatic tools with the existing technology, that is, the two different modes of high rotation speed and high torque at the same time, even if there is a switch, it is quite complicated. It is still necessary to prepare two different types of electric and pneumatic tools at the same time. As a result, the use cost will increase accordingly, and it will be more troublesome and space-consuming to carry or store.

Therefore, if an electric and pneumatic tool can be developed that has two different modes of high speed and high torque at the same time, the electric and pneumatic tools are quite simple, fast and convenient in the switching of transmission speed, allowing users to It is only necessary to prepare an electric and pneumatic tool to meet the needs of most of the work, which is the problem that the utility model intends to improve.

Utility model content

The purpose of the present utility model is to provide a transmission structure of electric and pneumatic tools that is simpler and easier in speed change switching.

In order to achieve the above purpose, the electric and pneumatic tool transmission structure of the present utility model mainly includes a connecting seat in front of the fuselage of an electric and pneumatic tool, and a handpiece, a traction member and a knob are installed on the connecting seat. , using the traction member to connect with the speed change gear ring of the speed change assembly put into the connection seat, the speed change gear can be driven together by the traction member through the operation of the knob outside the connection seat. The ring generates forward and backward translation, so that the electric and pneumatic tools can have two different modes of low speed, high torque and high speed, low torque by using the change of the clamping state of the speed change gear ring after translation. Options are provided, and the speed change assembly further includes a first planet carrier mounted in the inner ring portion of the speed change ring and a second planet carrier installed inside the connecting seat and behind the speed change ring and a fixed gear ring, and the first planet carrier is a central shaft that continuously passes through the connecting seat and the head and extends out of the front end of the head to output power, and the speed change gear ring is on the A first inserting portion is provided, and a second inserting portion is optionally provided on the connecting seat or the fixed gear ring or the machine head, wherein the connecting seat is an inner hollow shell, so that the The front and the rear of the connecting seat can be a first opening and a second opening respectively, and a first combining section is arranged in the first opening, so that the connecting seat can be inserted into the connecting seat with the first combining section. The inside of the machine head is assembled, the machine head is a hollow tube, and has a first end located in the front and a second end located in the rear, and the outer periphery of the machine head is formed at the second end. There is an enlarged part, which is assembled by the second joint section set on the enlarged part and the first joint section of the connecting seat, and the outer circumference of the enlarged part is also concave with several through grooves at equal distances. The inner wall of the machine head is provided with a step edge for providing the bearing sleeved on the outer circumference of the central shaft for embedding, and the traction member has a collar, and the rear end of the collar protrudes with a number of the passage grooves. Several claws in matching shape, the collar and the knob are sequentially sleeved on the outer circumference of the machine head extending out of the connecting seat, so that the claws can pass through the passage slot. into the connecting seat, using the formation of the driven part on the outer circumference of the collar and fitting with the active part of the inner wall of the knob, so that the traction member can be controlled by the rotation of the knob to be moved forward Or drive translation backwards, the speed change gear ring is provided with a first inserting part and a ring groove, when the speed change gear ring is put into the sleeve set inside the connecting seat, the buckle claws are used to fasten the ring groove. , so that the speed change gear ring can be smoothly connected with the traction member, and the first interlocking part is used to provide engagement or disengagement, so that the speed change gear ring can achieve the switching of the speed change, the first planet carrier The upper pivot is provided with a plurality of first planetary gears, and the first planetary carrier is sleeved into the inner ring portion of the speed change gear ring, so that the central shaft can protrude from the connecting seat through the machine head, and The first planetary gear is meshed with the inner ring tooth portion of the speed change gear ring, and the outer circumference of the first planet carrier is provided with a high speed and low torque mode. The ring teeth of the inner ring teeth bite each other, and the second planet carrier is pivoted with a plurality of second ring teeth. The planetary gear is combined with a sun gear meshed between the first planetary gears in front, and the fixed gear ring is installed and fixed in the second opening of the connecting seat, and the fixed gear ring and the first planet carrier are pivotally sleeved on The second planet carrier in the connecting seat is used as a limit, and the inner ring tooth portion of the fixed ring gear can be used to provide the second planetary gear of the second planet carrier. Do meshing; thereby, the electric and pneumatic tool transmission structure can be formed.

Optionally, the first interlocking portion is a limiting tooth provided on the outer periphery of the speed change gear ring, and the second interlocking portion is a fixed tooth provided behind the inner wall of the connecting seat, so that the When the electric and pneumatic tools are in the low-speed, high-torque mode, the fixed teeth are stuck on the limit teeth, so that the speed change gear ring cannot be locked in the low-speed, high-torque mode. The first planet carrier is driven to rotate together, and through the design that the ring teeth are arranged on the outer periphery in front of the first planet carrier, the electric and pneumatic tools can drive the speed changer with the knob through the traction member The gear ring moves forward to achieve a smooth switching of the use mode.

Optionally, the first interlocking portion is a limit tooth provided on the outer periphery of the speed change gear ring, and the second interlocking portion is a fixed tooth provided in front of the inner wall of the connecting seat, so that the When the electric and pneumatic tools are in the low-speed, high-torque mode, the fixed teeth are stuck on the limit teeth, so that the speed change gear ring cannot be locked in the low-speed, high-torque mode. The first planet carrier is driven to rotate together. Through the design that the ring teeth are arranged on the outer periphery of the rear of the first planet carrier, the electric and pneumatic tools can use the knob to drive the speed changer through the traction member. The ring gear can achieve a smooth switching of the use mode.

Optionally, the first interlocking portion is a limiting block protruding from the rear end of the speed change gear ring, and the second interlocking portion is a fixing block protruding from the front end of the fixed ring gear, so that the The fixed block blocks the limit block when the electric and pneumatic tools are in the low-speed, high-torque mode, so that the speed change ring cannot be locked in the low-speed, high-torque mode. The first planet carrier is driven to rotate together, and through the design that the ring teeth are arranged on the outer periphery in front of the first planet carrier, the electric and pneumatic tools can drive the speed changer with the knob through the traction member The gear ring moves forward to achieve a smooth switching of the use mode.

Optionally, the first engaging portion is a limit block protruding from the front end of the speed change gear ring, and the second engaging portion is a fixing block protruding from the second end of the machine head. The fixed block blocks the limit block when the electric and pneumatic tools are in the low-speed, high-torque mode, so that the speed change ring cannot be locked in the low-speed, high-torque mode. The first planet carrier is driven to rotate together. Through the design that the ring teeth are arranged on the outer periphery of the rear of the first planet carrier, the electric and pneumatic tools can use the knob to drive the speed changer through the traction member. The ring gear can achieve a smooth switching of the use mode.

Optionally, a disc-shaped cover is also combined in the second opening of the connecting seat, and the combination of the cover prevents the fixed tooth ring from coming out of the second opening, and the A through hole runs through the center of the cover.

Optionally, the first coupling section and the second coupling section are configured to cooperate with internal and external threads.

Optionally, the driven part is a plurality of protruding buttons disposed on the outer periphery of the collar, and the driving part is a helical groove that can provide the protruding buttons to follow during operation.

The effect of the utility model is: the electric and pneumatic tool transmission structure of the present utility model, the electric and pneumatic tools have two modes of low speed, high torque and high speed, low torque at the same time, in the speed change switch of the mode, there are two modes. It is only necessary to simply turn the knob, so that the user only needs to prepare one of the electric and pneumatic tools to meet the needs of most of the work, the cost of use is low, and it is more convenient to carry or store. It does not take up space, and the operation is easier and faster.

Detailed ways

Figure 1: is a perspective view of the utility model electric and pneumatic tools.

Figure 2: is a three-dimensional combined view of the utility model.

Fig. 3 is a perspective exploded view of the first preferred embodiment of the present invention.

FIG. 4 is a diagram showing the operation state of the first preferred embodiment of the present invention under a state of low rotational speed and high torque.

Fig. 5 is a diagram showing the operation state of the first preferred embodiment of the present invention after switching in a state of high rotational speed and low torque.

FIG. 6 is an exploded perspective view of the second preferred embodiment of the present invention.

FIG. 7 is a diagram showing the operation state of the second preferred embodiment of the present invention under the condition of low rotational speed and high torque.

FIG. 8 is a diagram showing the operation state of the second preferred embodiment of the present invention after switching in a state of high rotational speed and low torque.

FIG. 9 is an exploded perspective view of the third preferred embodiment of the present invention.

FIG. 10 is a diagram showing the operation state of the third preferred embodiment of the present invention under a state of low rotational speed and high torque.

FIG. 11 is a cross-sectional view of FIG. 10 of the utility model.

Fig. 12 is a diagram showing the operation state of the third preferred embodiment of the present invention after switching in a state of high rotational speed and low torque.

Fig. 13 is a perspective exploded view of the fourth preferred embodiment of the present invention.

FIG. 14 is a diagram showing the operation state of the fourth preferred embodiment of the present invention under the state of low rotational speed and high torque.

Fig. 15 is a cross-sectional view of Fig. 14 of the utility model.

Fig. 16 is a diagram showing the operation state of the fourth preferred embodiment of the present invention after switching in a state of high rotational speed and low torque.

In the picture:

Electric and Pneumatic Tools－10 Body－－－－11

Connection seat－－－－20 The first opening－－－201

The second opening---202 The first joint section---203

Cover－－－－－21

Machine head－－－－－30 First end－－－－301

The second end－－－302 Expansion－－－303

Second Combination Section - 304 Through Slot - - 305

Step edge－－－－－306 Bearing－－－－－31

Traction part－－－－40 Collar－－－－－41

Claw－－－－－42 Follower－－－43

Knob－－－－－50 Active part－－－－51

Gear Shift Kit－－－60 Gear Ring－－－61

The first inserting part－－611 Ring groove－－－－612

The first planet carrier－－62 Center shaft－－－－621

The first planetary gear－622 Ring tooth－－－－－623

Second planet carrier - 63 Second planet gear - 631

Sun gear－－－632 Fixed ring－－－64

The second inserting part - 70.

Detailed ways

The present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present utility model and implement it, but the examples are not intended to limit the present utility model.

Generally, according to the present invention, please look at FIG. 1 to FIG. 4 , which mainly includes a connecting seat 20 in front of the body 11 of an electric and pneumatic tool 10 , and a handpiece is installed on the connecting seat 20 . 30. A traction member 40 and a knob 50 can be used to connect the traction member 40 with the speed change gear ring 61 of the speed change assembly 60 placed in the connecting seat 20, so that the connecting seat 20 can pass through the outside of the connecting seat 20. The operation of the knob 50 drives the gear ring 61 to translate forward and backward through the traction member 40, so that the electric and pneumatic The tool 10 can be provided with two different modes of low speed, high torque and high speed, and low torque, and the speed change assembly 60 also includes a first planet carrier installed in the inner ring portion of the speed change gear ring 61 62 and a second planet carrier 63 and a fixed gear ring 64 installed inside the connecting seat 20 and located behind the transmission gear ring 61, and the first planet carrier 62 is continuously passing through the connecting seat 20 and the machine head 30 and extend out of a central shaft 621 at the front end of the machine head 30 to output power, and the speed change gear ring 61 is provided with a first inserting part 611, which is connected to the connecting seat 20 or the other. Either the fixed gear ring 64 or the machine head 30 is provided with a second inserting portion 70, wherein the connecting seat 20 is an inner hollow shell, so that the front and rear of the connecting seat 20 can be respectively formed into A first opening 201 and a second opening 202, and a first joint section 203 is disposed in the first opening 201, so that the connecting seat 20 can connect the first joint section 203 with all the components placed in the connecting seat 20. The handpiece 30 is assembled. The handpiece 30 is a hollow tube with a first end 301 located at the front and a second end 302 located at the rear. An enlarged part 303 is formed at the enlarged part 303, and the second joint section 304 set on the enlarged part 303 is assembled with the first joint section 203 of the connecting seat 20, and the outer circumference of the enlarged part 303 is also equidistantly recessed. There are several passage grooves 305, and the inner wall of the machine head 30 is provided with a step edge 306 for providing the bearing 31 sleeved on the outer circumference of the central shaft 621 for embedding. The traction member 40 has a set of rings 41. The rear end of the collar 41 protrudes with a number of claws 42 that match the passing grooves 305 . The collar 41 and the knob 50 are sequentially sleeved on the machine head 30 to extend. out of the outer circumference of the connecting seat 20, so that the claws 42 can penetrate into the connecting seat 20 from the passing groove 305, and use the formation of the driven part 43 on the outer circumference of the collar 41 to connect with the The active part 51 of the inner wall of the knob 50 is fitted, so that the traction member 40 can be controlled by the rotation of the knob 50 to be driven to translate forward or backward. The gear ring 61 is provided with a first engaging part 611 and a ring groove 612, when the speed change gear ring 61 is put into the set inside the connecting seat 20, the locking pawl 42 is used to fasten the ring groove 612, so that the speed change gear ring 61 It can be smoothly connected with the traction member 40, and the first interlocking portion 611 is used to provide engagement or disengagement, so that the speed change gear ring 61 can achieve the switching of the speed change. The first planet carrier 62 is pivoted with A plurality of first planetary gears 622 , the first planetary carrier 62 is sleeved into the inner ring portion of the transmission gear ring 61 , so that the central shaft 621 can extend from the connecting seat 20 through the machine head 30 , and the first planetary gear 622 is meshed with the inner ring tooth portion of the speed change gear ring 61, and the outer circumference of the first planetary carrier 62 is provided in a high-speed, low-torque mode. The inner ring teeth 623 of the speed change gear ring 61 are engaged with each other. The second planet carrier 63 is pivotally provided with a plurality of second planetary gears 631 , and a sun gear 632 meshing with the first planetary gears 622 is combined in front of the second planet carrier 63 . , the fixed ring gear 64 is installed and fixed in the second opening 202 of the connecting seat 20 , and the second planetary ring in the connecting seat 20 is pivotally sleeved by the fixed ring gear 64 and the first planet carrier 62 . The carrier 63 is used as a limit, and the inner ring tooth portion of the fixed ring gear 64 can be used to provide the second planetary gear 631 of the second planet carrier 63 for meshing.

The present invention provides an electric and pneumatic tool transmission structure, wherein the first interlocking portion 611 is a limiting tooth provided on the outer circumference of the speed change gear ring 61, and the second interlocking portion 70 is provided on the outer circumference of the gear ring 61. The fixed teeth on the back of the inner wall of the connecting seat 20 are used to lock the limit teeth when the electric and pneumatic tools 10 are in the low speed and high torque mode, so that the speed change is made. The ring gear 61 cannot be driven to rotate by the first planet carrier 62 in the low-speed and high-torque mode (please also see FIG. 3 and FIG. 4 ). The ring gear 623 is arranged on the The design of the outer periphery in front of the first planet carrier 62 enables the electric and pneumatic tools 10 to drive the speed change gear ring 61 forward with the knob 50 through the traction member 40 to achieve a smooth switching of the use mode ( Please view it from Figure 3 and Figure 5 at the same time).

The present invention provides an electric and pneumatic tool transmission structure, wherein the first interlocking portion 611 is a limiting tooth provided on the outer circumference of the speed change gear ring 61, and the second interlocking portion 70 is provided on the outer circumference of the gear ring 61. The fixed teeth in front of the inner wall of the connection seat 20 are used to lock the limit teeth when the electric and pneumatic tools 10 are in a low speed and high torque mode, so that the speed change is made. The ring gear 61 cannot be driven to rotate together by the first planet carrier 62 in the low-speed and high-torque mode (please see FIG. 6 and FIG. 7 at the same time), and the ring gear 623 is arranged on the The design of the outer periphery behind the first planet carrier 62 enables the electric and pneumatic tools 10 to use the knob 50 through the traction member 40 to drive the speed change gear ring 61 backward to achieve a smooth switching of use modes ( Please view it from Figure 6 and Figure 8 at the same time).

The present invention provides an electric and pneumatic tool transmission structure, wherein the first inserting portion 611 is a limiting block protruding from the rear end of the speed change gear ring 61, and the second inserting portion 70 is a protruding block. The fixed block at the front end of the fixed ring gear 64 is used to block the limit block when the electric and pneumatic tools 10 are in the low-speed and high-torque mode, so that the speed change is made. The ring gear 61 cannot be driven to rotate by the first planet carrier 62 in the low-speed and high-torque mode (please see FIG. 9 and FIG. 10 and FIG. 11 at the same time), through the ring gear 623 It is designed to be arranged on the outer periphery of the front of the first planet carrier 62, so that the electric and pneumatic tools 10 can drive the speed change ring 61 forward with the knob 50 through the traction member 40 to reach the operating mode. Smooth switching (please see both Figure 9 and Figure 12).

The present invention provides an electric and pneumatic tool transmission structure, wherein the first inserting portion 611 is a limiting block protruding from the front end of the speed change gear ring 61, and the second inserting portion 70 is a protruding block. The fixed block at the rear end of the second end 302 of the machine head 30 is used to block the limit block when the electric and pneumatic tools 10 are in the low-speed and high-torque mode, so that the The speed change ring gear 61 cannot be driven to rotate by the first planet carrier 62 in the low-speed, high-torque mode (please see FIG. 13 and FIG. 14 and FIG. 15 at the same time), through the The ring gear 623 is designed to be arranged on the outer periphery of the rear of the first planet carrier 62 , so that the electric and pneumatic tool 10 can use the knob 50 to drive the gear ring 61 backward through the traction member 40 for use. The smooth switching of the mode (please observe it from Figure 13 and Figure 16 at the same time).

The utility model provides an electric and pneumatic tool transmission structure, wherein a disc-shaped cover 21 is combined with the second opening 202 of the connection base 20, and the combination of the cover 21 prevents the The fixing gear ring 64 is protruded from the second opening 202 , and a through hole penetrates through the center of the cover 21 .

The utility model provides an electric and pneumatic tool transmission structure, wherein the first combining section 203 and the second combining section 304 are arranged to cooperate with internal and external threads.

The utility model provides an electric and pneumatic tool transmission structure, wherein the driven part 43 is a plurality of convex buttons arranged on the outer circumference of the collar 41, and the active part 51 can provide the convex buttons Do follow the spiral groove during operation.

With the above structure, since the second interlocking portion 70 is normally used to catch the speed change gear ring 61 , when the speed change assembly 60 receives the second planetary gears 631 of the second planetary carrier 63 together When the power generated by the motor of the electric and pneumatic tool 10 is generated, the speed change ring 61 cannot be driven to rotate by the first planet carrier 62, so that the speed change assembly 60 can only use the fixed ring 64, the second planet The sequential connection of the gear 631 , the sun gear 632 , and the first planetary gear 622 matches the appropriate reduction ratio set by the first planetary gear 622 , that is, the first planetary gear 622 rotates around the center of the sun gear 632 once. The shaft 621 can only be rotated about one third of a turn, or the central shaft 621 can be rotated once, and the first planetary gear 622 needs to be rotated three times to output power in a low-speed, high-torque mode. Provide a need for use (please see it from Figure 4, Figure 7, Figure 10 and Figure 14 at the same time).

If high speed and low torque are required during use, the knob 50 is rotated in one direction, so that the knob 50 can drive the gear ring 61 forward or backward through the claws 42 of the traction member 40 Translate, so that the speed change gear ring 61 can be released from the clamping of the second interlocking portion 70 after the translation, and the inner ring tooth portion of the speed change gear ring 61 simultaneously bites the first planetary gear 622 and the The ring teeth 623 are used to connect the first planetary gear 622 , the first planetary carrier 62 and the central shaft 621 into one body through the engagement of the transmission gear ring 61 . At this time, the first planetary gear 622 can no longer be free. Idling, so that the first planet carrier 62 together with the central shaft 621 and the speed change gear ring 61 can be meshed with the first planet gear 622 and the sun gear 632 to directly drive the first planet carrier 62 by the sun gear 632 , the central shaft 621 and the gear ring 61 are rotated, and the transmission without deceleration enables the electric and pneumatic tools 10 to be used in a high-speed, low-torque output mode (please refer to Figure 5 and Figure 8 at the same time). , as shown in Figure 12 and Figure 16).

The above-mentioned electric and pneumatic tool transmission structure has the following advantages: the electric and pneumatic tool 10 has two modes of low speed, high torque and high speed, and low torque at the same time, and the speed switching of the modes is simple and simple It is enough to turn the knob 50, so that the user only needs to prepare one of the electric and pneumatic tools 10 to meet the needs of most of the work, the cost of use is low, and it is more convenient to carry or store It takes up space and is easier and faster to operate.

The above-mentioned embodiments are only preferred embodiments for fully explaining the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or transformations made by those skilled in the art on the basis of the present invention are all within the protection scope of the present invention. The protection scope of the present utility model is subject to the claims.

Claims (8)

1. A kind of electric, pneumatic tool transmission structure, it is to have a connection base in front of the fuselage of an electric, pneumatic tool, install a aircraft nose, a traction piece and a knob on the said connection base, utilize the said traction piece to connect with the variable speed gear ring of the variable speed assembly put into said connection base, can drive the said variable speed gear ring to produce the translation forward and backward through the operation of the said knob outside the said connection base through the said traction piece together, utilize the said variable speed gear ring to shift the change of the solid state after the translation, make the said electric, pneumatic tool can have low rotational speed, high torsion and high rotational speed, two different modes of low torsion offer the choice, and the said variable speed assembly also includes a first planet carrier installed in the inner ring part of the said variable speed gear ring and installs in the said connection base and a second planet carrier and a fixed gear ring behind the said variable speed gear ring, and the first planet carrier continuously passes through the connecting seat and the machine head and extends out of a central shaft at the front end of the machine head to output power, a first embedded part is arranged on the speed change gear ring, and a second embedded part is selected and arranged on the connecting seat or the fixed gear ring or the machine head, and the first planet carrier is characterized in that:

the connecting seat is a shell with a hollow interior, so that the front and the back of the connecting seat can respectively form a first opening and a second opening, and a first combining section is arranged in the first opening, so that the connecting seat can be assembled with the machine head placed in the connecting seat through the first combining section;

the machine head is a hollow pipe and is provided with a first end positioned in front and a second end positioned in back, an expanded part is formed on the periphery of the machine head at the second end, a second combining section arranged on the expanded part is assembled with the first combining section of the connecting seat, a plurality of through grooves are concavely arranged on the periphery of the expanded part at equal intervals, and a step edge for providing a bearing sleeved on the periphery of the central shaft for embedding is arranged on the inner wall of the machine head;

the traction piece is provided with a lantern ring, a plurality of buckling claws which are matched with the passing grooves in number are extended from the rear end of the lantern ring, the lantern ring and the knob are sequentially sleeved on the periphery of the machine head extending out of the connecting seat, the buckling claws can penetrate into the connecting seat from the passing grooves, and the traction piece can be driven to move forwards or backwards to move horizontally under the control of the rotation of the knob by utilizing the formation of a driven part on the periphery of the lantern ring and fitting with a driving part on the inner wall of the knob;

the speed-changing gear ring is provided with a first embedded part and a ring groove, when the speed-changing gear ring is put into the connecting seat, the buckle claw is utilized to buckle the ring groove, so that the speed-changing gear ring can be smoothly connected with the traction part, the first embedded part is utilized to provide clamping or separation, so that the speed-changing gear ring can achieve switching on speed change, the first planet carrier is pivoted with a plurality of first planet gears, the first planet carrier is sleeved into the inner ring part of the speed-changing gear ring, the central shaft can extend out from the connecting seat through the machine head and is meshed with the inner ring tooth part of the speed-changing gear ring through the first planet gears, the periphery of the first planet carrier is provided with ring teeth which can be meshed with the inner ring tooth part of the speed-changing gear ring under the modes of high rotating speed and low rotating speed, the second planet carrier is pivoted with a plurality of second planet gears, the front part of the connecting seat is combined with a sun gear meshed among the first planet gears, the fixed gear ring is fixedly arranged in the second opening of the connecting seat, the second planet carrier which is sleeved in the connecting seat in a pivoted mode is limited by the fixed gear ring and the first planet carrier, and the inner ring tooth part of the fixed gear ring is used for providing meshing for the second planet gears of the second planet carrier.

2. The transmission structure of an electric or pneumatic tool as claimed in claim 1, wherein the first engaging portion is a limit engaging tooth disposed on the periphery of the speed-changing gear ring, the second engaging portion is a fixed engaging tooth disposed behind the inner wall of the connecting seat, and the limit engaging tooth is engaged by the fixed engaging tooth in a normal state where the electric or pneumatic tool is in a low-speed and high-torque mode, so that the speed-changing gear ring cannot be driven by the first carrier to rotate in the low-speed and high-torque mode.

3. The transmission structure of an electric or pneumatic tool as claimed in claim 1, wherein the first engaging portion is a limit engaging tooth disposed on the outer periphery of the speed-changing gear ring, the second engaging portion is a fixed engaging tooth disposed in front of the inner wall of the connecting seat, and the limit engaging tooth is engaged by the fixed engaging tooth in a normal state where the electric or pneumatic tool is in a low-speed and high-torque mode, so that the speed-changing gear ring cannot be driven by the first carrier to rotate in the low-speed and high-torque mode.

4. The transmission structure of an electric or pneumatic tool as claimed in claim 1, wherein the first engaging portion is a limiting block protruding from the rear end of the speed-changing gear ring, the second engaging portion is a fixing block protruding from the front end of the fixing gear ring, and the fixing block is used to lock the limiting block in a normal state of the electric or pneumatic tool in a low-speed and high-torque mode, so that the speed-changing gear ring cannot be driven by the first carrier to rotate in the low-speed and high-torque mode.

5. The transmission structure of an electric or pneumatic tool as claimed in claim 1, wherein the first engaging portion is a limiting block protruding from the front end of the speed-changing gear ring, the second engaging portion is a fixing block protruding from the second end of the head, and the fixing block is used to lock the limiting block in a normal state of the electric or pneumatic tool in a low-speed and high-torque mode, so that the speed-changing gear ring cannot be driven by the first carrier to rotate in the low-speed and high-torque mode.

6. The transmission structure of electric and pneumatic tools as claimed in claim 1, wherein a disc-shaped cover is further coupled to the second opening of the connecting base for stopping the fixed gear ring from coming out of the second opening, and a through hole is formed through the center of the cover.

7. The transmission structure of electric and pneumatic tools as claimed in claim 1, wherein the first and second coupling sections are provided with internal and external threads.

8. The power, pneumatic tool transmission of claim 1, wherein the driven portion is a plurality of knobs disposed on the outer periphery of the collar, and the driving portion is a spiral groove for the knobs to follow during operation.

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