CN107009310B - High-low speed automatic switching device for electric torque wrench and electric torque wrench - Google Patents
High-low speed automatic switching device for electric torque wrench and electric torque wrench Download PDFInfo
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- CN107009310B CN107009310B CN201610057970.4A CN201610057970A CN107009310B CN 107009310 B CN107009310 B CN 107009310B CN 201610057970 A CN201610057970 A CN 201610057970A CN 107009310 B CN107009310 B CN 107009310B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B13/00—Spanners; Wrenches
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Abstract
The invention discloses a high-low speed automatic switching device for an electric torque wrench and the electric torque wrench, wherein an output sleeve of the electric torque wrench is connected with an output main shaft of a driving motor by adopting the high-low speed automatic switching device, a planetary gear of a first-stage planetary gear mechanism is connected with the right end of a cylinder body of the high-low speed automatic switching device by an input planetary carrier, the output main shaft of the driving motor is meshed with the planetary gear of the first-stage planetary gear mechanism by a gear and is simultaneously connected with the right end of a central driving shaft of the high-low speed automatic switching device, a planetary gear of a second-stage planetary gear mechanism is connected with the output sleeve by an output planetary carrier, and an external gear at the left end of a sun gear output shaft of the high-low speed automatic switching device is meshed with the planetary gear of the second-stage planetary. Compared with the prior art, the invention automatically switches high-speed torque and low-speed torque, so that the electric torque wrench can exert maximum efficiency in different bolt tightening stages, the bolt tightening efficiency is improved, and the energy consumption is saved.
Description
Technical Field
The invention belongs to the technical field of electric wrenches, and particularly relates to a high-low speed automatic switching device for an electric torque wrench and the electric torque wrench.
Background
The main structure of the electric torque wrench in the market at present is that a motor provides power, and the torque of the motor is increased to fasten bolts through speed reduction of a group of gears. Typically, the overall speed ratio of the gear reduction is fixed or the speed ratio of the entire reduction is changed by manual shifting (this shifting is performed after the motor stops operating), such as a power wrench (application No. 201420457744.1) which can maintain a constant speed rotation but is limited to operating at a constant speed during a duty cycle so that the operating speed of the wrench is relatively slow. However, in the general bolt tightening working condition, the nut or the bolt head is in an idle stroke without torque in a section of process before being attached to the fastening surface, and the torque can quickly rise to reach the required fastening torque after the nut or the bolt head is attached to the fastening surface. If the idle stroke from the start of bolt tightening to the end of bolt tightening is performed at a constant speed, the bolt tightening efficiency is inevitably low, and energy is wasted.
Disclosure of Invention
The invention aims to provide a high-low speed automatic switching device for an electric torque wrench and the electric torque wrench, which are used for solving the technical problems in the prior art and can realize high-low speed automatic switching along with the increase of torque.
In order to achieve the above object, an embodiment of the present invention provides a high-low speed automatic switching device for an electric torque wrench, which is used for automatically switching connection between a speed reduction mechanism and an output sleeve in the electric torque wrench, and the high-low speed automatic switching device includes a barrel, a sun gear output shaft, and a switching mechanism, wherein the barrel has a circular cavity with an open end, at least three circular arc clamping grooves are arranged on an inner wall of the circular cavity along an axial direction of the barrel, the circular arc clamping grooves are uniformly distributed along a circumferential direction of the inner wall of the circular cavity, a through hole is formed in a center of a bottom of the circular cavity, and the sun gear output shaft and the switching mechanism are arranged;
the switching mechanism comprises a central driving shaft, a jacking spring, an annular driving block and a steel ball pressing block, wherein the central driving shaft is a stepped shaft, the right end of the central driving shaft is in transmission connection with an output shaft of a motor, the annular driving block is sleeved on the central driving shaft and is in transmission connection with the central driving shaft, three arc-shaped grooves with outward openings are formed in the circumferential surface of the annular driving block along the axial direction of the annular driving block, and the three arc-shaped grooves are uniformly distributed along the circumferential direction;
the steel ball pressing block is integrally embedded in the cavity of the barrel, a through hole is formed in the center of the steel ball pressing block, the left end face of the steel ball pressing block is provided with an inclined plane which extends along the circumferential direction and inclines inwards, the right end of the steel ball pressing block is propped against the bottom of the cavity of the barrel through the jacking spring, and the right end of the central driving shaft penetrates through the through hole of the steel ball pressing block and is in transmission connection with the output shaft of the motor;
the sun gear output shaft is a stepped shaft, an outer gear is arranged on the surface of the shaft at the left end of the sun gear output shaft, an annular inclined plane boss is arranged on the end face at the right end of the sun gear output shaft, the inclined plane of the annular inclined plane boss can be matched and attached with the inclined plane at the left end of the steel ball pressing block, three V-shaped open slots extending to the right end face of the sun gear output shaft are axially formed in the annular inclined plane boss, are uniformly distributed along the circumferential direction of the annular inclined plane boss and penetrate through the annular inclined plane boss, the sun gear output shaft is embedded into the opening of the cylinder cavity through an annular cover plate, the annular cover plate covers the opening of the cylinder cavity, the left end of the sun gear output shaft extends to the outer side of the left; the first transmission steel ball can move among the V-shaped open slot, the arc-shaped slot and the arc-shaped slot, so that the first transmission steel ball is in simultaneous contact with the V-shaped open slot, the arc-shaped slot and the left end inclined plane of the steel ball pressing block or in simultaneous contact with the V-shaped open slot, the arc-shaped slot and the left end inclined plane of the steel ball pressing block.
In the technical scheme, the right end of the sun wheel output shaft is provided with the annular inclined plane boss which is provided with three V-shaped open slots uniformly distributed in the circumferential direction, the right end of the central driving shaft is connected with the output shaft of the driving motor, the other end of the central driving shaft is connected with the right end of the sun wheel output shaft through the annular driving block, the driving steel balls, the jacking spring and the steel ball pressing block, the sun wheel output shaft, the annular driving block, the driving steel balls, the jacking spring and the steel ball pressing block are arranged in the inner cavity of the cylinder body together, the position of the inner cavity wall of the cylinder body, which corresponds to the V-shaped open slot of the annular inclined plane boss, is uniformly provided with at least three circular arc clamping slots in the circumferential direction, the annular driving block is connected with the central driving shaft in a driving way, the left end of the steel ball pressing block, The left end inclined planes of the steel ball press blocks are contacted simultaneously, so that the driving motor drives the central driving shaft to rotate, the central driving shaft drives the sun wheel output shaft to rotate through the annular driving block, the transmission steel balls, the annular inclined plane boss and the steel ball press blocks which are clamped mutually, the sun wheel output shaft is connected with the output sleeve through the second-stage planetary gear mechanism, when the torque of the sun wheel output shaft is increased, the transmission steel balls generate outward diffusion force due to the extrusion of the annular driving block and the annular inclined plane boss of the sun wheel output shaft, simultaneously, the outward diffusion force generates force enough to offset the force of the abutting spring through the inner inclined plane of the steel ball press block which is contacted with the transmission steel balls, so that the steel ball press blocks are far away from the sun wheel output shaft, the transmission steel balls are clamped in the circular arc clamping grooves and the V-shaped open grooves of the annular inclined plane boss and are separated from the annular, the first-stage planetary gear mechanism is connected with the right end of the cylinder body, so that the cylinder body is driven to rotate, the cylinder body drives the sun gear output shaft to rotate, the output sleeve is decelerated by the two-stage planetary gear transmission mechanism, the rotating speed is greatly reduced, the torque is improved, and the high-speed and low-speed automatic switching work is realized.
Furthermore, the switching mechanism also comprises an anti-locking mechanism, the annular driving block is in transmission connection with the central driving shaft through the anti-locking mechanism, a counter bore is formed in the left end face of the central driving shaft, and internal threads are formed in the inner wall of the counter bore; the anti-blocking mechanism comprises a power spring and an ejector block, the power spring, the ejector block and an annular driving block which are sequentially arranged on the central driving shaft are fixed in an integrated driving assembly through a fastening screw, the driving assembly is embedded in a through hole of a steel ball pressing block, the left end surface of the steel ball pressing block is propped against the right end surface of the ejector block, the right end surface of the power spring is propped against a shaft shoulder at the right end of the central driving shaft, the left end of the power spring is propped against the right end surface of the annular driving block through the ejector block, three concave holes are uniformly formed in the right end surface of the annular driving block along the circumferential direction, the left end surface of the ejector block is provided with a round hole corresponding to the position shape of the concave hole, the concave hole is in transmission connection with the round hole through a second transmission steel ball, and the ejector block is connected with the, the top block is made movable in the axial direction of the central drive shaft. In the technical scheme, through being equipped with three shrinkage pool on annular drive block, be equipped with the round hole that corresponds with three shrinkage pool position on the kicking block, the shrinkage pool with connect through the transmission of second transmission steel ball between the round hole, the kicking block cover is established on central drive shaft, is equipped with power spring between the two, can be for kicking block initiative an angle when annular drive block meets big resistance, makes the smooth card of transmission steel ball go into in the circular arc draw-in groove, realizes the anti-sticking purpose of dying.
Furthermore, twelve arc clamping grooves are uniformly distributed along the circumferential direction of the inner wall of the circular cavity. Evenly establish twelve, can make smooth the moving to the circular arc draw-in groove from the arc wall in of steel ball, improved switching efficiency, reduced the dead condition of steel ball card.
Furthermore, a plane bearing is arranged between the left end of the annular driving block and the fastening screw, a plane bearing is arranged between the jacking spring and the bottom of the cavity of the barrel, and a plane bearing is arranged between the annular cover plate and the sun gear output shaft. Through setting up the plane bearing, make the frictional force reduction between each part, reduced wearing and tearing, prolonged life.
Furthermore, the speed reducing mechanism comprises a first-stage planetary gear mechanism and a second-stage planetary gear mechanism, an input planet carrier of the first-stage planetary gear mechanism is connected with the right end of the cylinder, and an output planet carrier of the second-stage planetary gear mechanism is in meshed connection with an external gear at the left end of the sun gear output shaft through a planetary gear.
The invention also provides an electric torque wrench with automatic high and low speed switching, which comprises a shell, a driving motor and an output sleeve, wherein the output sleeve is connected with an output main shaft of the driving motor through any one of the automatic high and low speed switching devices, the inner wall of a cavity of the shell is provided with two internal gears, a planetary gear of a first-stage planetary gear mechanism is connected with the right end of a cylinder body of the automatic high and low speed switching device through an input planetary carrier, the output main shaft of the driving motor is meshed with the planetary gear of the first-stage planetary gear mechanism through a gear and is simultaneously connected with the right end of a central driving shaft of the automatic high and low speed switching device, the planetary gear of a second-stage planetary gear mechanism is meshed with one of the internal gears in the cavity of the shell, and the planetary gear of the second-stage planetary gear mechanism is connected with the output sleeve through an output planetary carrier, and an outer gear at the left end of a sun gear output shaft of the high-low speed automatic switching device is in meshed connection with a planetary gear of the second-stage planetary gear mechanism.
Compared with the prior art, the invention automatically switches high-speed torque and low-speed torque, so that the electric torque wrench can exert maximum efficiency in different bolt tightening stages, the bolt tightening efficiency is improved, and the energy consumption is saved.
Drawings
Fig. 1 is a schematic sectional view of a high-low speed automatic switching device for an electric torque wrench according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a switching mechanism according to an embodiment of the present invention;
fig. 3 is a partially omitted schematic view of a switching mechanism structure according to an embodiment of the present invention;
fig. 4 is a partially omitted schematic view of a switching mechanism structure according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a transmission assembly of the switching mechanism according to an embodiment of the present invention;
FIG. 6 is a schematic diagram illustrating the transmission state between the central driving shaft and the output shaft of the sun gear according to the embodiment of the present invention;
FIG. 7 is a schematic diagram illustrating a transmission state of the connection between the cylinder and the sun gear output shaft according to an embodiment of the present invention;
FIG. 8 is a schematic structural view of a cartridge in an embodiment of the present invention;
FIG. 9 is a schematic structural diagram of an annular driving block according to an embodiment of the present invention;
FIG. 10 is a schematic structural diagram of a top block in an embodiment of the present invention;
FIG. 11 is a schematic view of the output shaft of the sun gear according to an embodiment of the present invention;
in the figure, 1-drive motor output main shaft, 11-input planet carrier, 12-first stage planetary gear mechanism, 2-machine shell, 21-internal gear, 3-output sleeve, 31-output planet carrier, 32-second stage planetary gear mechanism, 4-sun gear output shaft, 40-annular cover plate, 41-annular inclined plane lug, 411-V type open slot, 42-sun gear output shaft gear, 5-cylinder, 50-circular arc clamping slot, 51-clamping ring, 6-steel ball pressing block, 61-tightening spring, 7-central drive shaft, 70-locking bolt, 71-top block, 711-round hole, 712-spline slot, 72-second drive steel ball, 73-drive spring, 8-annular drive block, 80-concave hole, 81-arc groove, 9-first transmission steel ball.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
Examples
As shown in fig. 1 to 11, an embodiment of the present invention provides a high-low speed automatic switching device for an electric torque wrench, which is used for automatically switching connection between a speed reduction mechanism and an output sleeve in the electric torque wrench, and the high-low speed automatic switching device includes a cylinder 5, a sun gear output shaft 4, and a switching mechanism, where the cylinder 5 has a circular cavity with one open end, and at least three circular arc slots 50 are formed on an inner wall of the circular cavity along an axial direction of the circular cavity, in this embodiment, the circular arc slots 50 are preferably twelve, and are uniformly distributed along a circumferential direction of the inner wall of the circular cavity, a through hole is formed in a center of a bottom of the circular cavity, and the sun gear output shaft 4 and the switching mechanism are disposed in;
the switching mechanism comprises a steel ball pressing block 6, a jacking spring 61, a central driving shaft 7 and an annular driving block 8, wherein the central driving shaft 7 is a stepped shaft, the right end of the central driving shaft 7 is in transmission connection with the motor output shaft 1, the left end face of the central driving shaft is provided with a counter bore, the inner wall of the counter bore is provided with internal threads, the annular driving block 8 is sleeved on the central driving shaft 7 and is in transmission connection with the central driving shaft, the circumferential surface of the annular driving block 8 is provided with three arc-shaped grooves 81 with outward openings along the axial direction, and the three arc-shaped grooves 81 are uniformly distributed;
the steel ball pressing block 6 is integrally embedded in the cavity of the barrel 5, a through hole is formed in the center of the steel ball pressing block, the left end face of the steel ball pressing block 6 is provided with an inclined plane which extends along the circumferential direction and inclines inwards, the right end of the steel ball pressing block 6 is abutted against the bottom of the cavity of the barrel 5 through the jacking spring 61, a plane bearing is arranged between the jacking spring 61 and the bottom of the cavity of the barrel 5, so that the steel ball pressing block and the cavity can rotate smoothly, and the right end of the central driving shaft 7 penetrates through the through hole of the steel ball pressing block 6 to be in transmission connection with the motor output shaft 1 in;
the sun gear output shaft 4 is a stepped shaft, an outer gear 42 is arranged on the surface of the shaft at the left end of the sun gear output shaft, an annular inclined plane boss 41 is arranged on the end face at the right end of the sun gear output shaft, the inclined plane of the annular inclined plane boss can be matched and attached with the inclined plane at the left end of the steel ball pressing block 6, three V-shaped open grooves 411 extending to the right end face of the sun gear output shaft 4 are axially formed in the annular inclined plane boss 41, and the three V-shaped open grooves 411 are uniformly distributed along the circumferential direction of the annular inclined plane boss 41; the annular driving block 8 is embedded in an inner hole of the annular inclined plane boss 41, the sun gear output shaft 4 is embedded in an opening of a cavity of the cylinder 5 through an annular cover plate 40, the annular cover plate 40 is clamped and covered at the opening of the cavity of the cylinder 5 through a clamping ring 51, the left end of the sun gear output shaft 4 extends to the outer side of the left end of the cylinder 5 from the inner hole of the annular cover plate 40, and a plane bearing is arranged between the annular cover plate 40 and the sun gear output shaft 4, so that the annular cover plate 40 and the sun gear output shaft 4 can rotate smoothly; three V type open slot 411, arc wall 81, circular arc draw-in groove 50 with all be equipped with first transmission steel ball 9 in the cavity that forms between the inclined plane of the left end of steel ball briquetting 6, first transmission steel ball 9 can move between V type open slot 411, arc wall 81, the circular arc draw-in groove 50, make first transmission steel ball 9 with the left end inclined plane of V type open slot 411, arc wall 81, steel ball briquetting 6 contact simultaneously or with the inclined plane of the left end of V type open slot 411, circular arc draw-in groove 50, steel ball briquetting 6 contacts simultaneously.
The speed reducing mechanism comprises a first-stage planetary gear mechanism 12 and a second-stage planetary gear mechanism 32, an input planet carrier 11 of the first-stage planetary gear mechanism 12 is connected with the right end of the barrel 5, and an output planet carrier 31 of the second-stage planetary gear mechanism 32 is meshed and connected with an outer gear 42 at the left end of the sun gear output shaft 4 through a planetary gear
In order to prevent the first transmission steel balls from being blocked when moving among the V-shaped open slot 411, the arc-shaped slot 81 and the arc-shaped clamping slot 50, the switching mechanism is also provided with an anti-blocking mechanism, and the annular driving block 8 is in transmission connection with the central driving shaft 7 through the anti-blocking mechanism; the anti-locking mechanism comprises a power spring 73 and an ejector block 71, wherein a fastening screw 70 is used for sequentially penetrating from the left end of the central driving shaft 7 and sleeving the power spring 73, the ejector block 71 and the annular driving block 8 on the central driving shaft 7 to form a driving assembly, the driving assembly is embedded in a through hole of the steel ball pressing block 6, a plane bearing is arranged between the left end of the annular driving block 8 and the fastening screw 70 to enable the annular driving block 8 and the fastening screw to rotate smoothly, the left end surface of the steel ball pressing block 6 supports against the right end of the ejector block 71, the right end surface of the power spring 73 supports against a shaft shoulder at the right end of the central driving shaft 7, the left end of the power spring 73 supports against the right end surface of the annular driving block 8 through the ejector block 71, the right end surface of the annular driving block 8 is uniformly provided with three concave holes 80 along the circumferential direction, the left end surface of the ejector block 71 is provided with a round hole 711 corresponding to, the concave hole 80 is in transmission connection with the circular hole 711 through a second transmission steel ball 72, and the top block 71 is in transmission connection with a spline on the central driving shaft 7 through a spline groove 712, so that the top block 71 can move along the axial direction of the central driving shaft 7.
The invention also provides an electric torque wrench with automatic high and low speed switching, which comprises a shell 2, a driving motor and an output sleeve 3, wherein the output sleeve 3 is connected with an output main shaft 1 of the driving motor by adopting the automatic high and low speed switching device, the inner wall of a cavity of the shell 2 is provided with two internal gears 21, a planetary gear of a first-stage planetary gear mechanism 12 is connected with the right end of a cylinder 5 of the automatic high and low speed switching device by an input planetary carrier 11, the output main shaft 1 of the driving motor is meshed with the planetary gear of the first-stage planetary gear mechanism 12 by a gear and is simultaneously in transmission connection with the right end of a central driving shaft 7 of the automatic high and low speed switching device by a spline connection mode, the planetary gear of a second-stage planetary gear mechanism 32 is meshed with one of the internal gears 21 in the cavity of the shell 2, the planetary gears of the second-stage planetary gear mechanism 32 are connected to the output sleeve 3 through an output carrier 31, and the outer gear 42 of the sun gear output shaft 4 of the high-low speed automatic switching device is connected in mesh with the planetary gears of the second-stage planetary gear mechanism 32.
The working principle of the invention is as follows: in the initial state, the transmission steel ball 9 contacts with the V-shaped open slot 411, the arc-shaped slot 81 and the left end inclined plane of the steel ball pressing block 6 at the same time, so that the driving motor drives the central driving shaft 7 to rotate, the central driving shaft 7 drives the sun wheel output shaft 4 to rotate through the mutual clamping of the annular driving block 8, the transmission steel ball 9, the annular inclined plane boss 41 and the steel ball pressing block 6, the sun wheel output shaft 4 is connected with the output sleeve 3 through the second-stage planetary gear mechanism 32, so that the output sleeve 3 drives the loose bolt to be screwed down at high speed, when the bolt is screwed down, the torque of the sun wheel output shaft 4 is gradually increased, the first transmission steel ball 9 generates an outward diffusion force due to the extrusion of the annular driving block 8 and the annular inclined plane boss 41 of the sun wheel output shaft 4, and simultaneously the outward diffusion force generates a thrust force which is enough to offset the tightening spring 61 through the inner inclined plane of the steel ball pressing block 6, make steel ball briquetting 6 keep away from sun gear output shaft 4, first transmission steel ball 9 is blocked in circular arc draw-in groove 50 and the V type open slot 411 of annular inclined plane boss 41, break away from with annular drive block 8, driving motor's output main shaft 1 passes through the gear and is connected with first order planetary gear mechanism 12 simultaneously, first order planetary gear mechanism 12 is connected with barrel 5 right-hand member, thereby drive barrel 5 and rotate, barrel 5 drives sun gear output shaft 4 and rotates, thereby make output sleeve 3 simultaneously through first order planetary gear mechanism 12, the speed reduction of the two-stage planetary gear drive of second level planetary gear mechanism 32, greatly reduced the rotational speed, the moment of torsion has been improved, high low-speed automatic switch over work has been realized.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (6)
1. A high-low speed automatic switching device for an electric torque wrench is used for automatically switching connection between a speed reducing mechanism and an output sleeve in the electric torque wrench, and is characterized by comprising a barrel, a sun gear output shaft and a switching mechanism, wherein the barrel is provided with a circular cavity with one open end, the inner wall of the circular cavity is provided with at least three circular arc clamping grooves along the axial direction, the circular arc clamping grooves are uniformly distributed along the circumferential direction of the inner wall of the circular cavity, the center of the bottom of the circular cavity is provided with a through hole, and the sun gear output shaft and the switching mechanism are arranged in the barrel;
the switching mechanism comprises a central driving shaft, a jacking spring, an annular driving block and a steel ball pressing block, wherein the central driving shaft is a stepped shaft, the right end of the central driving shaft is in transmission connection with an output shaft of a motor, the annular driving block is sleeved on the central driving shaft and is in transmission connection with the central driving shaft, three arc-shaped grooves with outward openings are formed in the circumferential surface of the annular driving block along the axial direction of the annular driving block, and the three arc-shaped grooves are uniformly distributed along the circumferential direction;
the steel ball pressing block is integrally embedded in the cavity of the barrel, a through hole is formed in the center of the steel ball pressing block, the left end face of the steel ball pressing block is provided with an inclined plane which extends along the circumferential direction and inclines inwards, the right end of the steel ball pressing block is propped against the bottom of the cavity of the barrel through the jacking spring, and the right end of the central driving shaft penetrates through the through hole of the steel ball pressing block and is in transmission connection with the output shaft of the motor;
the sun gear output shaft is a stepped shaft, an outer gear is arranged on the surface of the shaft at the left end of the sun gear output shaft, an annular inclined plane boss is arranged on the end face at the right end of the sun gear output shaft, the inclined plane of the annular inclined plane boss can be matched and attached with the inclined plane at the left end of the steel ball pressing block, three V-shaped open slots extending to the right end face of the sun gear output shaft are axially formed in the annular inclined plane boss, are uniformly distributed along the circumferential direction of the annular inclined plane boss and penetrate through the annular inclined plane boss, the sun gear output shaft is embedded into the opening of the cylinder cavity through an annular cover plate, the annular cover plate covers the opening of the cylinder cavity, the left end of the sun gear output shaft extends to the outer side of the left; the first transmission steel ball can move among the V-shaped open slot, the arc-shaped slot and the arc-shaped slot, so that the first transmission steel ball is in simultaneous contact with the V-shaped open slot, the arc-shaped slot and the left end inclined plane of the steel ball pressing block or in simultaneous contact with the V-shaped open slot, the arc-shaped slot and the left end inclined plane of the steel ball pressing block.
2. The automatic switching device for the high and low speeds of the electric torque wrench as claimed in claim 1, wherein the switching mechanism further comprises an anti-seize mechanism, the annular driving block is in transmission connection with the central driving shaft through the anti-seize mechanism, a counter bore is arranged on the left end face of the central driving shaft, and an internal thread is arranged on the inner wall of the counter bore; the anti-blocking mechanism comprises a power spring and an ejector block, the power spring, the ejector block and an annular driving block which are sequentially arranged on the central driving shaft are fixed in an integrated driving assembly through a fastening screw, the driving assembly is embedded in a through hole of a steel ball pressing block, the left end surface of the steel ball pressing block is propped against the right end surface of the ejector block, the right end surface of the power spring is propped against a shaft shoulder at the right end of the central driving shaft, the left end of the power spring is propped against the right end surface of the annular driving block through the ejector block, three concave holes are uniformly formed in the right end surface of the annular driving block along the circumferential direction, the left end surface of the ejector block is provided with a round hole corresponding to the position shape of the concave hole, the concave hole is in transmission connection with the round hole through a second transmission steel ball, and the ejector block is connected with the, the top block is made movable in the axial direction of the central drive shaft.
3. The automatic high-low speed switching device for the electric torque wrench as claimed in claim 2, wherein the number of the circular arc slots is twelve, and the circular arc slots are evenly distributed along the circumferential direction of the inner wall of the circular cavity.
4. The automatic high-low speed switching device for the electric torque wrench as claimed in claim 3, wherein a flat bearing is provided between the left end of the annular driving block and the fastening screw, a flat bearing is provided between the tightening spring and the bottom of the cavity of the barrel, and a flat bearing is provided between the annular cover plate and the sun gear output shaft.
5. The automatic high-low speed switching device for the electric torque wrench according to any one of claims 1 to 4, wherein the speed reduction mechanism comprises a first stage planetary gear mechanism and a second stage planetary gear mechanism, an input planet carrier of the first stage planetary gear mechanism is connected with the right end of the cylinder, and an output planet carrier of the second stage planetary gear mechanism is in meshed connection with the outer gear at the left end of the sun gear output shaft through a planetary gear.
6. An electric torque wrench with automatic high and low speed switching, characterized in that it comprises a housing, a driving motor, an output sleeve, the output sleeve is connected with the output main shaft of the driving motor by using the automatic high and low speed switching device according to claim 5, the inner wall of the housing cavity has two internal gears, the planetary gear of the first stage planetary gear mechanism is connected with the right end of the barrel body of the automatic high and low speed switching device by an input planet carrier, the output main shaft of the driving motor is meshed with the planetary gear of the first stage planetary gear mechanism by a gear and simultaneously connected with the right end of the central driving shaft of the automatic high and low speed switching device, the planetary gear of the second stage planetary gear mechanism is meshed with one of the internal gears in the housing cavity, the planetary gear of the second stage planetary gear mechanism is connected with the output sleeve by an output planet carrier, and an outer gear at the left end of a sun gear output shaft of the high-low speed automatic switching device is in meshed connection with a planetary gear of the second-stage planetary gear mechanism.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610057970.4A CN107009310B (en) | 2016-01-28 | 2016-01-28 | High-low speed automatic switching device for electric torque wrench and electric torque wrench |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610057970.4A CN107009310B (en) | 2016-01-28 | 2016-01-28 | High-low speed automatic switching device for electric torque wrench and electric torque wrench |
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| CN107009310A CN107009310A (en) | 2017-08-04 |
| CN107009310B true CN107009310B (en) | 2020-04-17 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107904739A (en) * | 2017-12-21 | 2018-04-13 | 江苏华灵纺机有限公司 | Yarn waxing device |
| CN108081215B (en) * | 2018-01-10 | 2024-02-02 | 广州华立科技职业学院 | Manual drilling, sawing and twisting integrated machine |
| CN108724077B (en) * | 2018-08-21 | 2024-07-09 | 陕西蓝智机器人有限公司 | Manipulator capable of automatically replacing wrench and working method |
| CN110937125A (en) * | 2019-11-28 | 2020-03-31 | 成都智巡科技有限责任公司 | Cloud platform rapid disassembly structure |
Citations (5)
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| JP2000024944A (en) * | 1998-07-14 | 2000-01-25 | Matsushita Electric Works Ltd | Rotating tool attached with transmission |
| CN1270875C (en) * | 2001-11-12 | 2006-08-23 | 日本电产芝浦株式会社 | Electronic driven tool |
| CN102335904A (en) * | 2010-07-20 | 2012-02-01 | 苏州宝时得电动工具有限公司 | Power tool |
| CN102448673A (en) * | 2009-04-13 | 2012-05-09 | 株式会社牧田 | Electric tool |
| CN202702200U (en) * | 2011-08-06 | 2013-01-30 | 苏州宝时得电动工具有限公司 | Power tool |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000024944A (en) * | 1998-07-14 | 2000-01-25 | Matsushita Electric Works Ltd | Rotating tool attached with transmission |
| CN1270875C (en) * | 2001-11-12 | 2006-08-23 | 日本电产芝浦株式会社 | Electronic driven tool |
| CN102448673A (en) * | 2009-04-13 | 2012-05-09 | 株式会社牧田 | Electric tool |
| CN102335904A (en) * | 2010-07-20 | 2012-02-01 | 苏州宝时得电动工具有限公司 | Power tool |
| CN202702200U (en) * | 2011-08-06 | 2013-01-30 | 苏州宝时得电动工具有限公司 | Power tool |
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| CN107009310A (en) | 2017-08-04 |
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