CN201989132U - Multi-stage speed change mechanism - Google Patents

Abstract

The utility model discloses a multi-section speed change mechanism, which comprises a first speed change gear device and a second speed change gear device; the first speed changing gear device comprises a speed changing gear which can be controlled to move axially, and the second speed changing gear comprises a fixed ring which can be controlled to move axially and is provided with a first positioning projection and a second positioning projection; when the first inner tooth portion is engaged with the outer tooth portion and the first positioning protrusion is engaged with the first positioning rib, the rotation speed is converted into a first rotation speed; when the first inner tooth portion is engaged with the outer tooth portion and the second positioning protrusion is engaged with the second positioning rib, the rotation speed is converted into a second rotation speed; when the first inner tooth part is separated from the outer tooth part and the first positioning protruding part is meshed with the first positioning protruding rib, the rotating speed is converted into a third rotating speed; when the first inner tooth portion is disengaged from the outer tooth portion and the second positioning projection is engaged with the second positioning rib, the rotational speed is converted into a fourth rotational speed.

Description

Multi-stage speed change mechanism

technical field

The utility model relates to a speed change mechanism for an electric tool, in particular to a mechanism capable of providing four-stage speed change functions.

Background technique

The existing power tools used for drilling, locking, etc. are structured to transmit the power of the motor to the output shaft through the gear system to output power; in order to meet the needs of actual work and expand the range of use of the product, most power tools Equipped with a variable speed function to control the speed of the output shaft. However, the speed change mechanisms of most electric tools can only provide three-stage speed change functions, that is, only three different speeds can be provided to obtain three different torques; ), the mechanism is too complicated, so that the manufacturing cost is higher.

Utility model content

The main purpose of the utility model is to solve the problem that the components of the existing four-stage transmission mechanism of the electric tool are too complicated, so as to reduce the manufacturing cost.

The utility model is characterized in that two speed-changing gear devices are integrated together, and the two speed-changing gear devices cooperate with each other to operate, so that the output shaft of the electric tool can obtain four kinds of high-speed output, medium-high speed output, medium-low speed output and low-speed output. Function at different speeds.

Based on this, the multi-stage speed change mechanism provided by the utility model includes a first speed change gear device and a second speed change gear device; wherein, the first speed change gear device further includes a first planetary disc, a plurality of first planetary gears, a A transmission gear with a first internal tooth portion, a second planetary disc with a plurality of external tooth portions and a first pinion, and a plurality of second planetary gears, the plurality of first planetary gears are movably arranged on the first planetary gear a planetary disc and meshed with the first internal tooth portion of the speed change gear, the plurality of second planetary gears are movably arranged on the second planetary plate and meshed with the first pinion gear, and the speed change gear can be controlled axially moving to make the internal gear engage or disengage from the external gear of the second planetary disc, the first planetary disc is connected to an output shaft. The second speed change gear device further includes a third planetary disc with a plurality of second positioning ribs, a fixed ring with a plurality of first positioning protrusions and a plurality of second positioning protrusions, a fixed ring with a plurality of first positioning protrusions The convex rib and the inner gears of the second internal teeth, and the third planetary gears with the second pinion gears, the third planetary gears are movably arranged on the third planetary discs and mesh with the second pinion gears The second internal tooth portion of the internal gear, the third planetary gears mesh with a motor gear, the fixed ring can be controlled to move axially, so that the first positioning protrusion engages the first positioning rib, or the The second positioning protrusion is engaged with the second positioning rib.

In the utility model, by controlling the displacement of the transmission gear, the first internal tooth portion engages the external tooth portion of the second planetary disc, and the fixed ring is displaced until the first positioning protrusion engages the first positioning rib , the rotational speed input by the motor gear is converted from the output shaft to the first rotational speed (that is, high-speed output). When the shift gear is displaced such that the first internal teeth engage the external teeth of the second planetary disc, and the fixed ring is displaced such that the second positioning protrusion engages the second positioning rib, the motor gear The input speed is converted from the output shaft to a second speed (ie, medium and high speed output). The displacement of the transmission gear causes the first internal teeth to disengage from the external teeth of the second planetary disc, and the displacement of the fixed ring causes the first positioning protrusions to engage the first positioning ribs, the motor gear The input speed is converted from the output shaft into a third speed (ie, medium and low speed output). When the shift gear is displaced so that the first internal teeth disengage from the external teeth of the second planetary disc, and the fixed ring is displaced so that the second positioning protrusion engages the second positioning rib, the motor gear The input speed is converted from the output shaft to the fourth speed (ie low speed output).

The technical means of the utility model for controlling the axial movement of the speed change gear is to set a first ring groove on the outer diameter of the speed change gear, and to set a first guide rod in the first ring groove. A guide rod controls the axial movement of the transmission gear.

The technical means of the utility model to control the axial movement of the fixed ring is to set a second ring groove on the outer diameter of the fixed ring, and to set a second guide rod in the second ring groove. Two guide rods control the axial movement of the fixed ring.

A better option, the utility model is provided on the first positioning protrusion and the second positioning protrusion of the fixed ring, respectively located in the opposite direction of the fixed ring, and protruding in the axial direction; the utility model is located on the internal gear The first positioning rib and the second positioning rib provided on the third planetary disc are respectively provided on the outer diameter of the inner gear and the third planetary disc.

Description of drawings

Fig. 1 is a three-dimensional exploded view of an embodiment showing the combination relationship of the main components of the present invention.

Fig. 2 is a three-dimensional sectional view showing the combined structure of the components of the present invention and an embodiment of switching to a high-speed output state.

Fig. 3 is a three-dimensional sectional view showing the combined structure of the components of the present invention and an embodiment of switching to a medium-high speed output state.

Fig. 4 is a three-dimensional cross-sectional view showing the combined structure of the components of the present invention and an embodiment of switching to a medium-low speed output state.

Fig. 5 is a three-dimensional cross-sectional view showing the combined structure of the components of the present invention and an embodiment of switching to a low-speed output state.

Detailed ways

The implementation of the present utility model will be described in more detail below in conjunction with the drawings and component symbols of the specification, so that those skilled in the art can implement it after studying the specification.

Figure 1 is an exploded perspective view of a preferred embodiment showing the combination of the main components of the multi-stage transmission mechanism of the present invention; the components described below all have a first end and a second end in the opposite direction, and the first end described Both refer to the same direction (direction towards the output shaft at the front of the electric tool); the second ends all refer to another same direction (direction towards the motor gear at the rear of the electric tool).

The speed change mechanism of the present invention includes a first speed change gear device 1 and a second speed change gear device 2 . The first speed change gear device 1 further includes a first planetary plate 12, a plurality of first planetary gears 13, a speed change gear 14 with an internal tooth portion 142, a speed change gear 14 with a plurality of external tooth portions 151 and a first pinion 152. The second planetary disc 15, and a plurality of second planetary gears 27; wherein, the first end of the first planetary disc 12 is provided with a plurality of axially extending shaft rods 122, and the second end is provided with a plurality of axially extending first shafts 122. A planetary gear shaft 121; each first planetary gear shaft 121 is movably passed through a first planetary gear 13 respectively, and each shaft rod 122 is respectively movably passed through a roller 17, and then an actuating assembly 16 is combined on the The first end of the first planetary disc 12 makes each cylinder 17 all located in the inner diameter of the center hole 160 of the actuating assembly 16, and the first planetary disc 12 together with the actuating assembly 16, the cylinder 17 and a bearing 19 from a front The second end of the shell 11 is assembled in the front shell 11 ; the inner diameter of the front shell 11 is also provided with a plurality of internal convex ribs 111 . The output shaft 18 whose second end is formed as a polygonal shaft 181 passes through the front housing 11 from the first end of the front housing 11, so that the output shaft 18 fits into the bearing 19, and the polygonal shaft 181 passes through the polygonal hole of the first planetary disc 12. 120: When the first planetary disk 12 rotates, it can cooperate with the roller 17 and the actuating assembly 16 to drive the polygonal shaft 181, thereby causing the output shaft 18 to rotate; the first planetary disk 12 cooperates with the roller 17 and the actuating assembly 16 to drive the polygonal shaft 181 The structure and principle of action of the utility model belong to the existing technology, and are not the technical characteristics described in the utility model, so they will not be described in detail.

The speed change gear 14 is an annular body, the outer diameter of which is provided with a first ring groove 141, and a plurality of axially extending external convex ribs 144, and the inner diameter is provided with a plurality of internal teeth 142; the speed change gear 14 is formed by Combined with the second end of the first planetary disc 12, each first planetary gear 13 meshes with the internal tooth portion 142; the two ends of the first guide rod 143, which is generally C-shaped, fit in the first ring groove 141, and the first The guide rod 143 is installed on the rear casing 21 described below. When the user operates the first guide rod 143, the speed change gear 14 can be moved axially; the outer convex rib 144 can engage with the inner convex rib 111 of the front casing 11 .

The second planetary disc 15 has a plurality of external gears 151, and a first pinion 152 coaxially arranged at the first end, and a plurality of second planetary gear shafts 153 are arranged at the second end of the second planetary disc 15, each The second planetary gears 153 are movable through a second planetary gear 27 ; the second planetary disc 15 is combined in the inner diameter of the transmission gear 14 , so that the first pinion gear 152 meshes with each first planetary gear 13 at the same time. The user can control the axial movement of the transmission gear 14 by operating the first guide rod 143 , so that the inner tooth portion 142 thereof engages with or disengages from the outer tooth portion 151 of the second planetary disc 15 .

Fig. 1 shows the second variable speed gear device 2 of the present utility model simultaneously, comprises a 3rd planetary disc 23, a fixed ring 24, a plurality of 3rd planetary gears 25 and an internal gear 26; The diameter is provided with a plurality of second positioning ribs 231, and the first end of the third planetary disc 23 is provided with a plurality of axially extending third planetary gear shafts 232, and each third planetary gear shaft 232 is movably passed through a first planetary gear shaft. Three planetary gears 25, the first end of the third planetary gear 25 is coaxially provided with a second pinion gear 251.

The fixed ring 24 is an annular body, and its outer diameter is provided with a second ring groove 243, and the first end of the fixed ring 24 is provided with a plurality of axially extending and circumferentially distributed first positioning protrusions 241 The second end of the fixing ring 24 is provided with a plurality of second positioning protrusions 242 extending axially and distributed around the circumference. The outer diameter of the inner gear 26 is provided with a plurality of axially extending first positioning ribs 263 and a third ring groove 261 , and the inner diameter is provided with an inner tooth portion 262 . The third planetary disc 23 is installed in a rear shell 21 after being combined with the third planetary gear 25 . The two ends of the second guide rod 244 which is generally C-shaped fit into the second ring groove 243 and then installed in the rear housing 21 , so that the second guide rod 244 is installed in the rear housing 21 . The internal gear 26 is also installed in the rear casing 21, and extends into the third ring groove 261 after passing through the shell wall of the rear casing 21 with at least one pin 264, and the internal gear 26 is limited by the pin 264, so that the internal gear 26 It can be rotated within the rear housing 21 but cannot be moved axially. The rear casing 21 and the front casing 11 are combined to form a complete casing to cover the various components of the first transmission gear device 1 and the second transmission gear device 2 . The motor gear 22 connected to the motor (not shown in the figure) passes through the second end of the rear shell 21 to engage with each third planetary gear 25 , and each second pinion gear 251 engages with the internal gear 262 . When the user operates the second guide rod 244, the axial movement of the fixed ring 24 can be controlled, so that the first positioning protrusion 241 engages the first positioning rib 263, or the second positioning protrusion 242 engages the second positioning rib 263. Convex ribs 231 .

The utility model carries out four kinds of rotating speed output (being four sections of variable speed) mode of operation description as follows:

Fig. 2 is a three-dimensional sectional view of an embodiment showing the combined structure of the transmission mechanism components of the present invention and switching to a high-speed output state (the first speed output). The figure shows that the user operates the first guide rod 143 to drive the speed change gear 14 to move toward the second end, so that the inner tooth portion 142 meshes with the outer tooth portion 151 of the second planetary disc 15; and operates the second guide rod 244 to make the fixed ring 24 Moving toward the first end, the first positioning protrusion 241 engages with the first positioning rib 263 of the internal gear 26 , and the internal gear 26 cannot rotate at this moment. Therefore, if the motor gear 22 rotates in the forward direction, it will drive the second planetary gear 27 to rotate in the reverse direction, and the second planetary disc 15 will rotate in the forward direction. 15 meshes, so that the transmission gear 14 rotates synchronously with the second planetary disc 15 and the first planetary disc 12, and then drives the output shaft 18 to output at a high speed (the first speed).

Fig. 3 is a three-dimensional cross-sectional view of an embodiment showing the combined structure of the speed change mechanism components of the present invention and switching to a medium-high speed output state (second speed output). The figure shows that the user operates the first guide rod 143 to drive the speed change gear 14 to move toward the second end, so that the inner tooth portion 142 meshes with the outer tooth portion 151 of the second planetary disc 15; and operates the second guide rod 244 to make the fixed ring 24 Move toward the direction of the second end until the second positioning protrusion 242 of the fixed ring 24 engages the second positioning rib 231 of the third planetary disc 23 , and the third planetary disc 23 cannot rotate at this time. Therefore, if the motor gear 22 rotates in the forward direction, it will drive the second planetary gear 27 to rotate in the reverse direction, and drive the internal gear 26 to rotate in the reverse direction, so that the second planetary disc 15 will decelerate and rotate in the forward direction; A planetary gear 13 meshes with the second planetary disc 15, so that the transmission gear 14 rotates synchronously with the second planetary disc 15 and the first planetary disc 12, and then drives the output shaft 18 to output at a medium-high speed (second speed).

Fig. 4 is a three-dimensional cross-sectional view of an embodiment showing the combined structure of the speed change mechanism components of the present invention and switching to the medium-low speed output state (the third speed output). The figure shows that the user operates the first guide rod 143 to drive the speed change gear 14 to move toward the first end, so that the inner tooth part 142 is separated from the outer tooth part 151 of the second planetary disc 15, and the outer convex rib on the outer diameter of the speed change gear 14 144 engages the inner convex rib 111 of the inner diameter of the front housing 11; and operates the second guide rod 244 to move the fixed ring 24 toward the first end until the first positioning protrusion 241 of the fixed ring 24 engages the outer diameter of the inner gear 26 The first positioning rib 263, the internal gear 26 at this time is fixed and cannot rotate. Therefore, if the motor gear 22 rotates in the forward direction, it will drive the second planetary gear 27 to rotate in the reverse direction, and drive the second planetary disc 15 to rotate in the forward direction; Therefore, the first pinion gear 152 of the second planetary disc 15 will drive the first planetary gear 13 to rotate in the reverse direction, and the first planetary disc 12 will be driven to decelerate and rotate in the forward direction, and then the output shaft 18 will rotate at a medium-low speed ( The third speed) output.

Fig. 5 is a three-dimensional sectional view showing the combined structure of the transmission mechanism components of the present invention, and an embodiment of switching to a low-speed output state (fourth speed output). The figure shows that the user operates the first guide rod 143 to drive the speed change gear 14 to move toward the first end, so that the inner tooth part 142 is separated from the outer tooth part 151 of the second planetary disc 15, and the outer convex rib on the outer diameter of the speed change gear 14 144 engages the inner convex rib 111 of the inner diameter of the front housing 11; and operates the second guide rod 244 to move the fixed ring 24 toward the second end until the second positioning protrusion 242 of the fixed ring 24 engages the outer diameter of the third planetary disc 23 The second positioning rib 231, at this time, the third planetary disc 23 is fixed and cannot rotate. Therefore, if the motor gear 22 rotates in the forward direction, it will drive the second planetary gear 27 to rotate in the reverse direction, and drive the internal gear 26 to rotate in the reverse direction, causing the second planetary disc 15 to decelerate and rotate in the forward direction; The casings 11 are meshed so that the speed change gear 14 cannot rotate. Therefore, the first pinion 152 of the second planetary disc 15 will drive the first planetary gear 13 to rotate in the reverse direction, and the first planetary disc 12 will be driven to decelerate and rotate forward, and then The output shaft 18 is output at a low rotational speed (the fourth rotational speed).

The above descriptions are only preferred embodiments for explaining the utility model, and are not intended to limit the utility model in any form. Therefore, any modifications made under the spirit of the same utility model Or changes, all should still be included in the category that the utility model intends to protect.

Claims (4)

1. A multi-stage speed change mechanism, characterized in that, comprising: A first speed change gear device includes a first planetary plate, a plurality of first planetary gears, a speed change gear with a plurality of first internal teeth, a second gear with a plurality of external teeth and a first pinion a planetary disc, and a plurality of second planetary gears, the plurality of first planetary gears are movably arranged on the first planetary disc and mesh with the first internal teeth of the speed change gear, and the plurality of second planetary gears are movably arranged in The second planetary disc meshes with the first pinion gear, and the transmission gear can be controlled to move axially, so that the first internal toothing engages or disengages the external toothing of the second planetary disc, and the first planetary The disk is connected to an output shaft; A second speed change gear device, including a third planetary disc with a plurality of second positioning ribs, a fixed ring with a plurality of first positioning protrusions and a plurality of second positioning protrusions, a fixed ring with a plurality of first positioning protrusions, and a plurality of first positioning protrusions. Positioning ribs and internal gears of a plurality of second internal teeth, and a plurality of third planetary gears with second pinion gears, the third planetary gears are movably arranged on the third planetary discs and make the second pinion gears Engaging with the second internal tooth portion of the internal gear, the third planetary gears are engaged with a motor gear, the fixed ring can be controlled to move axially, so that the first positioning protrusion engages with the first positioning rib, or make the second positioning protrusion engage the second positioning rib; When the shift gear is displaced such that the first internal teeth engage the external teeth of the second planetary disc, and the fixed ring is displaced such that the first positioning protrusion engages the first positioning rib, the motor gear The input rotation speed is converted by the transmission mechanism to output the first rotation speed from the output shaft; the displacement of the transmission gear causes the first internal tooth portion to mesh with the external tooth portion of the second planetary disc, and the displacement of the fixed ring causes the When the second positioning protrusion engages the second positioning rib, the rotational speed input by the motor gear is converted through the transmission mechanism to output the second rotational speed from the output shaft; the displacement of the transmission gear causes the first internal gear When the outer teeth of the second planetary disc are disengaged, and the fixed ring is displaced so that the first positioning protrusion engages the first positioning rib, the rotational speed of the input of the motor gear is converted from the output through the transmission mechanism. The shaft outputs the third rotation speed; the displacement of the transmission gear causes the internal teeth to disengage from the external teeth of the second planetary disc, and the displacement of the fixed ring causes the second positioning protrusions to engage the second positioning ribs , the rotation speed input by the motor gear is converted through the transmission mechanism to output a fourth rotation speed from the output shaft. 2. The multi-stage transmission mechanism according to claim 1, wherein the outer diameter of the transmission gear is provided with a first ring groove, and a first guide rod fits in the first ring groove to control the The speed change gear moves axially. 3. The multi-stage transmission mechanism according to claim 1, wherein the outer diameter of the fixed ring is provided with a second ring groove, and a second guide rod fits in the second ring groove to control the The retaining ring moves axially. 4. The multi-stage transmission mechanism according to claim 1, characterized in that, the first positioning protrusion and the second positioning protrusion are respectively provided in opposite directions of the fixed ring, and protrude axially, and the first positioning protrusion The positioning rib and the second positioning rib are respectively arranged on the outer diameter of the internal gear and the outer diameter of the third planetary disc.

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