CN213661359U

CN213661359U - Electric push rod

Info

Publication number: CN213661359U
Application number: CN202022385465.7U
Authority: CN
Inventors: 卿兆波; 杨惠忠
Original assignee: Hangzhou Zhongzhigao Intelligent Technology Co ltd
Current assignee: Hangzhou Zhongzhigao Intelligent Technology Co ltd
Priority date: 2020-10-23
Filing date: 2020-10-23
Publication date: 2021-07-09
Anticipated expiration: 2030-10-23

Abstract

The utility model relates to an electric push rod, which comprises a motor, a rotor rotating around a stator component, wherein the rotor is fixedly connected with a rotor shaft and a speed reduction transmission mechanism, the rotor shaft comprises a screw and a helical gear, the screw is fixedly sleeved on the rotor shaft, the helical gear is meshed with the screw, the rotor component rotates to drive the rotor shaft to rotate, so that the screw and the helical gear are driven to transmit, and the rotating speed of the motor is reduced to the required speed to be output; the screw transmission mechanism comprises a screw rod, a screw nut and a push rod, wherein the lower end of the screw rod penetrates through the helical gear, the helical gear and the screw rod form a revolute pair, the upper end of the screw rod is sleeved with the screw nut and forms a revolute pair with the screw rod, the lower end of the screw rod is fixedly connected to the screw nut, and the push rod moves linearly back and forth along the screw rod along with the rotation of the screw rod. The utility model discloses electric putter has that the motor is external rotor electric machine, and small, power density is high, low noise, screw rod pair have reverse auto-lock performance's advantage.

Description

Electric push rod

Technical Field

The utility model relates to an electric putter field especially relates to an integrated integrative electric putter of motor, speed reduction drive mechanism, screw drive mechanism.

Background

The electric push rod is a universal auxiliary driving device and widely used in a plurality of industries, and the electric push rod converts the rotary motion of a motor into the linear reciprocating motion of the push rod and can be used as an execution machine to realize remote control, centralized control or automatic control. The electric push rod has the main working principle that a motor drives a screw rod to rotate, a transmission nut is arranged on the screw rod, the transmission nut is driven to reciprocate when the screw rod rotates, and a worm and gear mechanism is usually adopted between the motor and the screw rod to realize transmission.

Current electric putter generally includes supporting seat, motor, drive mechanism, lead screw, nut, inner tube and outer tube, and drive mechanism includes the gear, and the supporting seat includes the bearing, and the bearing frame lead screw passes through the bearing and realizes for the rotation of shell, and the bearing passes through the bearing frame to be fixed on the shell, and outer tube one end is equipped with the tail and draws, and during the use, the axial force that the lead screw received passes through lead screw, gear, bearing frame and transmits the tail and draw to supporting electric putter. The gear is placed in the gear box, the gear box is connected with the bearing seat through screws, and the gear box needs to be divided into two parts due to assembly reasons and is connected through screws. The existing assembled electric push rod has many parts and large volume, and needs further improvement in volume and weight when being applied to narrow space or precise occasions. When the existing electric push rod adopts a large-pitch lead screw or a ball screw, the push rod is high in efficiency and high in moving speed, but is not self-locked, and can be effectively braked only by external braking.

SUMMERY OF THE UTILITY MODEL

The utility model provides an integrated integrative electric putter of motor, speed reduction drive mechanism, screw drive mechanism has the advantage of small, light in weight, power density height, good, the low noise of precision. When this application electric putter adopts coarse pitch lead screw or ball, the push rod is efficient, and the translation rate is fast, owing to adopted the combination of screw rod and helical gear, still can the auto-lock.

The utility model discloses a following technical scheme realizes above-mentioned purpose:

an electric push rod comprises a motor, wherein the motor comprises a stator component and a rotor, the rotor is sleeved outside the stator component and rotates around the stator component, the rotor is fixedly connected with a rotor shaft, the rotor shaft penetrates through the axial center line of the stator component and extends out of the stator component, and the rotor shaft and the stator component are supported by bearings; the speed reduction transmission mechanism comprises a screw and a helical gear, the screw is fixedly sleeved on the rotor shaft, the helical gear is meshed with the screw, and the rotor assembly rotates to drive the rotor shaft to rotate, so that the screw and the helical gear are driven to transmit, and the rotating speed of the motor is reduced to the required speed to be output; the screw transmission mechanism comprises a screw rod, a screw nut and a push rod, wherein the lower end of the screw rod penetrates through the helical gear, the helical gear and the screw rod form a revolute pair, the upper end of the screw rod is sleeved with the screw nut and forms a revolute pair with the screw rod, the push rod is a hollow circular tube, the lower end of the push rod is fixedly connected to the screw nut, and the push rod moves back and forth along the screw rod in a straight line along the rotation of the screw rod.

Furthermore, a bidirectional thrust bearing is sleeved outside the lower end of the lead screw and is located below the helical gear.

Furthermore, the lower end of the screw rod is provided with a one-way thrust bearing at the upper end and the lower end of the bevel gear respectively.

Further, the screw transmission mechanism further comprises a push rod sleeve, the push rod sleeve is a hollow cylinder, the cross section of the push rod sleeve is matched with that of the screw nut, the push rod sleeve is arranged outside the push rod, a push rod sleeve cover is arranged at the upper end of the push rod sleeve, a push rod telescopic hole is formed in the push rod sleeve cover, and the push rod extends out of or retracts into the push rod sleeve from the push rod telescopic hole.

Furthermore, the speed reduction transmission mechanism further comprises an output connecting piece covered on the helical gear and a buffer block clamped between the helical gear and the output connecting piece, wherein the buffer block is embedded inside the helical gear and matched with the contact surface of the helical gear, and the helical gear, the output connecting piece and the buffer block are tightly matched with each other and do not move relatively after being installed.

Furthermore, an installation through hole is formed in the center of the output connecting piece, the lead screw is clamped on the installation through hole, and a profile hole of the installation through hole is matched with a profile of the lead screw, so that the output connecting piece and the lead screw do not rotate relatively.

Further, electric putter still includes the shell case, motor and reduction gearing install in the shell case, the rotor shaft is keeping away from the fixed cover of one end of motor is equipped with support bearing, support bearing imbeds on the inner wall of shell case.

Compared with the prior art, the beneficial effects of the utility model are as follows:

1. the electric push rod uses the outer rotor motor, fixes the screw rod on the rotor shaft, and the screw rod is directly arranged on the helical gear, integrates the motor, the speed reduction transmission mechanism and the screw rod transmission mechanism, and has the advantages of compact structure, small volume and high power density.

2. The screw and helical gear combination of this application because gear drive's separability reduces the manufacturing degree of difficulty, and interchangeability is good.

3. The buffering component is additionally arranged in the bevel gear, a coupler of the existing electric driving device is replaced, on one hand, the impact of the device in the starting, stopping and running processes can be absorbed, and the running stability is guaranteed, and on the other hand, the buffering component is embedded in the bevel gear, so that the volume of the integrated electric driving device cannot be increased.

4. The lower end of the screw rod is provided with a bidirectional thrust bearing which can bear thrust or pressure borne by the push rod, so that the push rod can run stably.

Drawings

FIG. 1 is an exploded view of the power putter of the present invention;

FIG. 2 is an external view of the electric putter of the present invention;

fig. 3 is a sectional view of the screw drive mechanism of the present invention;

fig. 4 is a cross-sectional view of a screw drive mechanism of another construction of the present invention;

fig. 5 is a cross-sectional view of the motor of the present invention;

fig. 6 is an exploded view of the reduction drive mechanism of the present invention.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings:

example 1

Fig. 1 is an exploded view of an electric putter which includes a motor 1, a reduction gear mechanism, and a screw gear mechanism. The motor and the speed reducing transmission mechanism are arranged in the outer casing 9, the outer casing is composed of two parts which are mutually communicated, namely a motor casing 91 and a speed reducing transmission mechanism casing 92, and a cavity in the outer casing is matched with the shapes of the motor and the speed reducing transmission mechanism. One part of the square motor box body is used for installing a motor controller 15, the motor controller is sealed in the box body through a sealing cover 16, the other part of the motor box body is used for installing outer rotor electronics, and a motor base 17 is fixedly installed on the box body through bolts. The motor includes stator module 11 and cover and establishes outside stator module, the duplex winding stator module pivoted rotor 12, the rotor has linked firmly a rotor shaft 13, the rotor shaft runs through stator module's axial direction line and stretch out outside stator module, is provided with the rotor shaft passageway between motor box and reduction gears box, and the rotor shaft runs through motor box and reduction gears box. In order to ensure that the rotor shaft runs stably, a supporting bearing 10 is fixedly sleeved at one end of the rotor shaft, which is positioned at the box body of the speed reducing mechanism, and the supporting bearing is embedded into the inner wall of the box body of the speed reducing transmission mechanism and is fixedly connected with the box body.

The speed reduction transmission mechanism comprises a screw rod 2 and a helical gear 3, the screw rod is fixedly sleeved at one end of the rotor shaft, which extends out of the stator assembly, the helical gear is meshed with the screw rod, the rotor shaft is driven to rotate by the rotation of the rotor, so that the screw rod and the helical gear are driven to perform transmission, and the rotating speed of the motor is reduced to the required speed and then is output to the screw rod transmission mechanism. The screw transmission mechanism comprises a screw rod 4, a screw nut 5 and a push rod 6, the lower end of the screw rod penetrates through the helical gear, and a bidirectional thrust bearing 10 is sleeved outside the lower end of the screw rod, namely the bidirectional thrust bearing is positioned below the helical gear. The upper end of the screw rod is sleeved with a screw nut 5 which forms a rotating pair with the screw rod. The upper end of the screw nut is fixedly connected with a push rod 6, the push rod is a hollow circular tube, and the push rod linearly reciprocates along the screw along with the rotation of the screw.

In another case, as shown in fig. 4, one single direction thrust bearing 100 may be provided on each of the upper and lower surfaces of the helical gear at the lower end of the screw shaft, and in this case, one single direction thrust bearing may be provided on the upper portion of the helical gear and the other single direction thrust bearing may be provided on the lower portion of the helical gear, taking full advantage of the gap at the upper portion of the housing. Compare and set up a two-way thrust bearing, this mode can practice thrift the space, reduces the size of box.

The screw transmission mechanism further comprises a push rod sleeve 7, the push rod sleeve is a hollow cylinder, the cross section of the push rod sleeve is matched with that of the screw nut, the push rod sleeve is sleeved outside the push rod, a push rod sleeve cover 71 is arranged at the upper end of the push rod sleeve, a push rod telescopic hole 72 is formed in the push rod sleeve cover, and the push rod extends out of or retracts into the push rod sleeve from the push rod telescopic hole. The lower end of the push rod sleeve is fixed on the box body of the speed reduction transmission mechanism.

Fig. 2 is an appearance diagram of the installed electric push rod, the motor and the reduction transmission mechanism are installed on the integrated box body, under the control of the motor controller, the push rod extends out of a telescopic hole in the upper end of the push rod sleeve or retracts into the push rod sleeve through forward rotation or reverse rotation of the motor, and the push rod sleeve is fixed on the box body.

Fig. 3 is a cross-sectional view of the screw transmission mechanism, the outside of the screw is sleeved with a push rod 6, the outside of the push rod is sleeved with a push rod sleeve 7, wherein the screw is fixed on a helical gear, the helical gear rotates to drive the screw to do a rotary motion, a screw nut is fixedly connected to the lower end of the screw, the screw nut and the screw form a screw pair, the rotary motion of the screw is converted into a linear motion of the push rod, and the push rod is made to do a telescopic motion along the inside of the push rod sleeve. The structure has very small frictional resistance, and has the characteristics of high precision, reversibility and high efficiency.

Fig. 5 is a cross-sectional view of the motor, the motor includes stator module 11 and cover and establishes outside the stator module, the duplex winding stator module pivoted rotor 12, and the rotor has linked firmly a rotor shaft, the rotor shaft runs through stator module's axial direction line and stretches out outside the stator module, the rotor shaft with stator module supports with motor bearing 14, and the motor bearing is two, sets up respectively at stator module's both ends. And one end of the rotor shaft extending out of the stator assembly is fixedly connected with a screw rod, and the screw rod is meshed with the helical gear.

Fig. 6 is an exploded view of a reduction transmission mechanism, wherein the reduction transmission mechanism comprises a screw 2, a helical gear 3, an output connecting piece 31 covered on the helical gear, and a buffer block 32 clamped between the helical gear and the output connecting piece, the buffer block is embedded in the helical gear and matched with the contact surface of the helical gear, and the helical gear, the output connecting piece and the buffer block are tightly matched with each other and have no relative motion after installation. The buffer block is a cylinder with a certain thickness, and the shape and the size of the buffer block are matched with the helical gear and the output connecting piece so as to avoid the direct contact of the helical gear and the output connecting piece. The buffer block can effectively reduce vibration and noise.

Further, the buffer block is including setting up in the axle sleeve hole 321 at center, and the external diameter in axle sleeve hole is unanimous with the axle sleeve external diameter at the inside center of helical gear, follows the external diameter department in axle sleeve hole is provided with a plurality of spacing through-holes 322, in the buffer block with the one side of helical gear contact, is provided with the spacing groove 323 of a plurality of indents for with the radial fixed block 33 embedding spacing groove of helical gear, the degree of depth of spacing groove and the fixed block of helical gear is the same, quantity and unanimity, the fixed block tight fit of spacing groove and helical gear, after the installation, there is not relative movement between buffer block and the helical gear.

In this embodiment, the output connector includes a main body 312, a fixing post 313 and a mounting through hole 311. The main body of the output connecting piece is a circular flat sheet, preferably made of metal, a mounting through hole is formed in the center of the main body and used for mounting a lead screw, the shape of the mounting through hole is matched with the molded surface on the lead screw, the lead screw and the output connecting piece need to be in tight fit and do not slide relatively, a plurality of fixing columns are arranged on the surface of the main body of the output connecting piece vertically, at least 3 fixing columns are arranged and uniformly arranged on the same circumference of the plane of the main body, the outer diameter and the height of each fixing column are matched with the limiting through hole of the buffer block, after mounting, the fixing columns are inserted into the limiting through holes, the output connecting piece is fixed onto the helical gear, the output connecting piece, the buffer.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention.

Claims

1. An electric putter, comprising:

the motor comprises a stator component and a rotor sleeved outside the stator component and rotating around the stator component, wherein the rotor is fixedly connected with a rotor shaft, the rotor shaft penetrates through the axial center line of the stator component and extends out of the stator component, and the rotor shaft and the stator component are supported by bearings;

the speed reduction transmission mechanism comprises a screw and a helical gear, the screw is fixedly sleeved on the rotor shaft, the helical gear is meshed with the screw, and the rotor assembly rotates to drive the rotor shaft to rotate, so that the screw and the helical gear are driven to transmit, and the rotating speed of the motor is reduced to the required speed to be output;

the screw transmission mechanism comprises a screw rod, a screw nut and a push rod, wherein the lower end of the screw rod penetrates through the helical gear, the helical gear and the screw rod form a revolute pair, the upper end of the screw rod is sleeved with the screw nut and forms a revolute pair with the screw rod, the push rod is a hollow circular tube, the lower end of the push rod is fixedly connected to the screw nut, and the push rod moves back and forth along the screw rod in a straight line along the rotation of the screw rod.

2. The electric putter as claimed in claim 1, wherein a bidirectional thrust bearing is sleeved on the outer portion of the lower end of the lead screw, and the bidirectional thrust bearing is located below the bevel gear.

3. The electric putter as claimed in claim 1, wherein the lower end of the screw shaft is provided with a one-way thrust bearing at each of the upper and lower ends of the bevel gear.

4. The electric putter as claimed in claim 1, wherein the speed reduction transmission mechanism further comprises an output connecting member covering the helical gear, and a buffer block sandwiched between the helical gear and the output connecting member, wherein the buffer block is embedded inside the helical gear and matched with the contact surface of the helical gear, and the buffer block is elastically connected with the helical gear and the output connecting member, respectively.

5. The electric putter as claimed in claim 4, wherein the output connector has a through hole at the center, the lead screw is engaged with the through hole, and the through hole is matched with the profile of the lead screw, so that the output connector and the lead screw do not rotate relatively.

6. The power putter of claim 1, further comprising a housing case, wherein the motor and the reduction gear are mounted in the housing case, and the rotor shaft is fixedly sleeved with a support bearing at an end away from the motor, and the support bearing is embedded in an inner wall of the housing case.