CN109281813B - Electrically driven gear transmission plunger pump - Google Patents
Electrically driven gear transmission plunger pump Download PDFInfo
- Publication number
- CN109281813B CN109281813B CN201811252796.4A CN201811252796A CN109281813B CN 109281813 B CN109281813 B CN 109281813B CN 201811252796 A CN201811252796 A CN 201811252796A CN 109281813 B CN109281813 B CN 109281813B
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- plunger pump
- motor
- cavity
- small
- driving wheel
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
- F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/06—Means for converting reciprocating motion into rotary motion or vice versa
- H02K7/075—Means for converting reciprocating motion into rotary motion or vice versa using crankshafts or eccentrics
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Rotary Pumps (AREA)
- Reciprocating Pumps (AREA)
Abstract
The invention discloses an electrically driven gear transmission plunger pump which comprises a motor, a small-tooth-difference speed reduction transmission mechanism and a plunger pump body, wherein the input end of the small-tooth-difference speed reduction transmission mechanism is connected with the output shaft of the motor, and the output end of the small-tooth-difference speed reduction transmission mechanism eccentrically rotates and is connected with a plunger pump core in the plunger pump body so as to drive the plunger pump core to do up-down reciprocating linear motion in the plunger pump body. Thus, the motor, the speed reducing mechanism and the plunger pump body are combined to complete electromechanical-hydraulic integration, the complementary advantages and disadvantages are realized, the structure is ingenious, the parts are reduced, the cost is reduced, the function is integrated, the application is convenient, the application range field is greatly enlarged, the structure is compact, the volume is small, the position precision is high, the plunger pump core is driven to realize reciprocating motion by skillfully utilizing eccentric transmission with less tooth difference, a complex output mechanism is omitted, the industry selection and product development process is greatly and specially shortened, and the device is particularly suitable for vehicles, aircrafts, small-sized clamps of robots and the like.
Description
Technical Field
The invention belongs to the field of plunger pumps, and particularly relates to an electrically driven gear transmission plunger pump.
Background
The power driving of the plunger pump in the market is mainly the assembly combination of three-position separated products of a motor, a speed reducer and a plunger pump body, and the required technical performance is high in order to reasonably match and select various parts, and the process requirements are high due to the fact that the number of interconnecting links are large, and the development and selection period is long.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to solve the technical problems that: how to provide an electrically driven gear transmission plunger pump, its highly integrated motor, reduction gear and plunger pump body realize trinity plunger pump, develop the short cycle of choosing, be particularly suitable for vehicles, aircraft, robot small-size anchor clamps etc..
In order to solve the technical problems, the invention adopts the following technical scheme:
the utility model provides an electric drive gear drive plunger pump, includes motor, few tooth difference reduction gear and the plunger pump body, the input of few tooth difference reduction gear links to each other with the output shaft of motor, the output eccentric rotation of few tooth difference reduction gear links to each other with the plunger pump core in the plunger pump body in order to drive plunger pump core reciprocating rectilinear motion about in the plunger pump body.
Thus, the motor, the speed reducing mechanism and the plunger pump body are combined to complete electromechanical-hydraulic integration, the complementary advantages and disadvantages are realized, the structure is ingenious, the parts are reduced, the cost is reduced, the function is integrated, the application is convenient, the application range field is greatly enlarged, the structure is compact, the volume is small, the position precision is high, the plunger pump core is driven to realize reciprocating motion by skillfully utilizing eccentric transmission with less tooth difference, a complex output mechanism is omitted, the industry selection and product development process is greatly and specially shortened, and the device is particularly suitable for vehicles, aircrafts, small-sized clamps of robots and the like.
As optimization, an eccentric bearing is fixedly arranged on an output shaft of the motor, an outer gear is fixedly arranged on an outer ring of the eccentric bearing, one end of the outer gear, which is far away from the motor, is also coaxially provided with a driving wheel, the outer gear is meshed with an inner gear ring fixedly arranged on an output shaft end cover of the motor on one side of the output shaft of the motor, the driving wheel is connected with a plunger pump core, the eccentric bearing, the outer gear, the driving wheel and the inner gear ring form the small-tooth-difference speed reduction transmission mechanism, the input end of the small-tooth-difference speed reduction transmission mechanism is a motor output shaft, and the output end of the small-tooth-difference speed reduction transmission mechanism is a driving wheel.
Therefore, the output end of the small-tooth-difference speed reduction transmission mechanism, namely the driving wheel, is used as a driving piece of the plunger pump, the structure is simplified, links are reduced, the reliability is improved, the arrangement of the plunger pump body and the driving wheel is reduced, the centrifugal force of external gear transmission and the radial component force of the meshing of the external gear and the annular gear are reduced, the transmission is stable, and the buffer effect noise is small.
As the optimization, the plunger pump body is including having the plunger pump seat of first cavity, sealing installation in first cavity and have the plunger pump housing of second cavity and slide the spring base cover that sets up in first cavity bottom from top to bottom, the plunger pump core slides from top to bottom and sets up in the second cavity, and the top of second cavity is provided with the oil-out, and the plunger pump core upper end surrounds with second cavity upper wall and second cavity lateral wall and forms the pump grease chamber, and the oil suction mouth that is used for the oil absorption of intercommunication is opened to plunger pump housing lateral wall and plunger pump housing lateral wall that the pump grease chamber corresponds, and the plunger pump core lower extreme is fixed on spring base cover, be connected with reset spring between spring base cover and plunger pump housing or the plunger pump housing, spring base cover bottom surface and drive wheel looks butt.
Therefore, the plunger pump core utilizes the cylindrical surface to absorb oil and radial openings under the reciprocating motion to save an oil absorption valve, has the advantages of small oil absorption internal resistance, sufficient oil absorption, high efficiency, small dead zone, small oil absorption noise, simplified structure and improved reliability of the plunger pump.
As optimization, the bottom of the plunger pump seat is arranged in a reducer output supporting cover with a semi-surrounding structure, and the reducer output supporting cover, a motor output shaft end cover and the plunger pump seat are closed to form a containing cavity for containing the driving wheel to eccentrically rotate.
Therefore, the arrangement of the output support cover of the speed reducer is beneficial to protecting the parts of the speed reduction transmission mechanism with small tooth difference, and the plunger pump body, the motor and the speed reduction transmission mechanism with small tooth difference form a device from the appearance, so that the integration of the device is improved.
As optimization, a through hole for the output shaft of the motor to pass through is formed in the axial direction of the driving wheel, a bearing which is coaxial with the output shaft of the motor is fixedly arranged in the output support cover of the speed reducer, and the tail end of the output shaft of the motor is arranged in the bearing after passing through the through hole.
Therefore, the bearing in the output support cover of the speed reducer is arranged to form a two-point simple beam support with the eccentric bearing, so that the output shaft of the motor can rotate unconstrained.
As optimization, the outer peripheral surface of the driving wheel is sleeved with a rolling sleeve with a protection function, and the outer peripheral surface of the rolling sleeve is abutted against the bottom surface of the spring base sleeve.
Therefore, the rolling sleeve is arranged to protect the driving wheel and the spring base sleeve, so that the service lives of the driving wheel and the spring base sleeve are prolonged.
As optimization, the spring base sleeve is of a box-shaped structure with an opening at the upper end, the lower end of the plunger pump core is fixed on the inner bottom surface of the spring base sleeve, the outer wall of the lower part of the plunger pump housing is provided with a step surface, one end of the return spring is abutted to the inner bottom surface of the spring base sleeve, the other end of the return spring is abutted to the step surface, and a gap for the return spring to stretch out and draw back is arranged in the plunger pump base.
Thus, the structure enables the return spring to have a telescopic space in the plunger pump seat, and the return spring is matched with the driving wheel to realize the reciprocating linear motion of the plunger pump core.
As optimization, the plunger pump core and the return spring are coaxially arranged, and the lower part of the plunger pump core is inserted into the return spring.
Therefore, the reset spring is convenient to install, and the reset spring and the plunger pump core are coaxially arranged to facilitate the reciprocating motion of the plunger pump core.
As optimization, an oil outlet valve seat with an oil outlet valve core is arranged at the top of the second cavity, the upper end of the plunger pump core, the lower end of the oil outlet valve seat and the side wall of the second cavity are surrounded to form a pump oil chamber, and the oil outlet valve core is connected with an oil outlet.
Therefore, the oil outlet valve seat and the oil outlet valve core are arranged, so that the oil outlet of the oil outlet is controlled, and the sealing state in the oil pumping chamber is kept when no oil is discharged.
As optimization, the external gear and the driving wheel are integrally formed; the external gear is installed on the eccentric bearing outer ring in an interference mode.
Therefore, the external gear and the driving wheel are integrally formed, the manufacturing process can be simplified, mass manufacturing is facilitated, the external gear is installed on the outer ring of the eccentric bearing in an interference mode, the structure is simple, the bearing capacity is high, and impact load can be borne.
Drawings
FIG. 1 is a cross-sectional view of an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of a plunger pump body in an embodiment of the invention in a pressurized state;
FIG. 3 is a schematic cross-sectional view of a plunger pump body in an embodiment of the invention in an oil-absorbing state;
fig. 4 is a schematic diagram of the mesh of the ring gear with the external gear in an embodiment of the present invention.
Detailed Description
The invention will be described in further detail with reference to the accompanying drawings.
The specific implementation method comprises the following steps: referring to fig. 1 to 4, an electrically driven gear driven plunger pump comprises a motor 1, a small-tooth-difference speed reduction transmission mechanism and a plunger pump body, wherein the input end of the small-tooth-difference speed reduction transmission mechanism is connected with an output shaft 2 of the motor 1, and the output end of the small-tooth-difference speed reduction transmission mechanism eccentrically rotates and is connected with a plunger pump core 11 in the plunger pump body so as to drive the plunger pump core 11 to reciprocate in a straight line in the plunger pump body.
Thus, the motor, the speed reducing mechanism and the plunger pump body are combined to complete electromechanical-hydraulic integration, the complementary advantages and disadvantages are realized, the structure is ingenious, the parts are reduced, the cost is reduced, the function is integrated, the application is convenient, the application range field is greatly enlarged, the structure is compact, the volume is small, the position precision is high, the plunger pump core is driven to realize reciprocating motion by skillfully utilizing eccentric transmission with less tooth difference, a complex output mechanism is omitted, the industry selection and product development process is greatly and specially shortened, and the device is particularly suitable for vehicles, aircrafts, small-sized clamps of robots and the like.
As optimization, an eccentric bearing 3 is fixedly installed on the output shaft 2 of the motor 1, an outer ring of the eccentric bearing 3 is fixedly provided with an outer gear 6, one end of the outer gear 6 far away from the motor is also coaxially provided with a driving wheel 15, the outer gear 6 is meshed with an inner gear ring 5 fixedly installed on an end cover 4 of the motor output shaft 2, the driving wheel 15 is connected with a plunger pump core 11, the eccentric bearing 3, the outer gear 6, the driving wheel 15 and the inner gear ring 5 form the small-tooth-difference speed reduction transmission mechanism, the input end of the small-tooth-difference speed reduction transmission mechanism is the motor output shaft 2, and the output end of the small-tooth-difference speed reduction transmission mechanism is the driving wheel 15.
Therefore, the output end of the small-tooth-difference speed reduction transmission mechanism, namely the driving wheel, is used as a driving piece of the plunger pump, the structure is simplified, links are reduced, the reliability is improved, the arrangement of the plunger pump body and the driving wheel is reduced, the centrifugal force of external gear transmission and the radial component force of the meshing of the external gear and the annular gear are reduced, and the transmission is stable and the buffer effect noise is small.
As optimization, the plunger pump body includes the plunger pump seat 9 that has first cavity, sealed install in first cavity and have the plunger pump housing 12 of second cavity and slide the spring base cover 8 that sets up in first cavity bottom from top to bottom, plunger pump core 11 slides from top to bottom and sets up in the second cavity, the top of second cavity is provided with oil-out 16, and plunger pump core 11 upper end and second cavity upper wall and second cavity lateral wall surround and form the pump grease chamber, and the oil suction port 17 that is used for the oil absorption of intercommunication is opened to plunger pump housing lateral wall and the plunger pump housing lateral wall that the pump grease chamber corresponds, and the plunger pump core 11 lower extreme is fixed on spring base cover 8, be connected with reset spring 10 between spring base cover 8 and plunger 12 or the plunger pump seat 9, spring base cover 8 bottom surface and drive wheel 15 looks butt.
Therefore, the plunger pump core utilizes the cylindrical surface to absorb oil and radial openings under the reciprocating motion to save an oil absorption valve, has the advantages of small oil absorption internal resistance, sufficient oil absorption, high efficiency, small dead zone, small oil absorption noise, simplified structure and improved reliability of the plunger pump.
As an optimization, the bottom of the plunger pump seat 9 is arranged in a reducer output supporting cover 18 with a semi-surrounding structure, and the reducer output supporting cover 18, the motor output shaft end cover 4 and the plunger pump seat 9 are sealed to form a containing cavity for containing the driving wheel 15 to eccentrically rotate.
Therefore, the arrangement of the output support cover of the speed reducer is beneficial to protecting the parts of the speed reduction transmission mechanism with small tooth difference, and the plunger pump body, the motor and the speed reduction transmission mechanism with small tooth difference form a device from the appearance, so that the integration of the device is improved.
As an optimization, a through hole for the output shaft 2 of the motor to pass through is formed in the axial direction of the driving wheel 15, a bearing coaxial with the output shaft of the motor is fixedly installed in the reducer output supporting cover 18, and the tail end of the output shaft 2 of the motor is installed in the bearing after passing through the through hole.
Therefore, the bearing in the output support cover of the speed reducer is arranged to form a two-point simple beam support with the eccentric bearing, so that the output shaft of the motor can rotate unconstrained.
Preferably, the outer peripheral surface of the driving wheel 15 is sleeved with a rolling sleeve 7 with a protection function, and the outer peripheral surface of the rolling sleeve 7 is abutted against the bottom surface of the spring base sleeve 8.
Therefore, the rolling sleeve is arranged to protect the driving wheel and the spring base sleeve, so that the service lives of the driving wheel and the spring base sleeve are prolonged.
As an optimization, the spring base sleeve 8 is of a box-shaped structure with an opening at the upper end, the lower end of the plunger pump core 11 is fixed on the inner bottom surface of the spring base sleeve 8, a step surface is arranged on the outer wall of the lower portion of the plunger pump housing 12, one end of the return spring 10 is abutted to the inner bottom surface of the spring base sleeve 8, the other end of the return spring is abutted to the step surface, and a gap for the return spring 10 to stretch is arranged in the plunger pump seat 9.
Thus, the structure enables the return spring to have a telescopic space in the plunger pump seat, and the return spring is matched with the driving wheel to realize the reciprocating linear motion of the plunger pump core.
As optimization, the plunger pump core 11 and the return spring 10 are coaxially arranged, and the lower part of the plunger pump core 11 is inserted into the return spring.
Therefore, the reset spring is convenient to install, and the reset spring and the plunger pump core are coaxially arranged to facilitate the reciprocating motion of the plunger pump core.
As optimization, an oil outlet valve seat 13 with an oil outlet valve core 14 is arranged at the top of the second cavity, the upper end of the plunger pump core 11, the lower end of the oil outlet valve seat 13 and the side wall of the second cavity are surrounded to form the oil pumping chamber, and the oil outlet valve core 14 is connected with an oil outlet 16.
Therefore, the oil outlet valve seat and the oil outlet valve core are arranged, so that the oil outlet of the oil outlet is controlled, and the sealing state in the oil pumping chamber is kept when no oil is discharged.
As optimization, the external gear 6 and the driving wheel 15 are integrally formed; the external gear 6 is mounted on the outer ring of the eccentric bearing 3 in an interference manner.
Therefore, the external gear and the driving wheel are integrally formed, the manufacturing process can be simplified, mass manufacturing is facilitated, the external gear is installed on the outer ring of the eccentric bearing in an interference mode, the structure is simple, the bearing capacity is high, and impact load can be borne.
The motion principle of the electrically driven gear transmission plunger pump is as follows: the motor drives the output shaft 2 to rotate, the external gear 6 forms the rotation along with the eccentric revolution of the output shaft 2 and the amplification of the reverse rotation moment under the action of the counter force of the annular gear 5, the functions of speed reduction and moment amplification are formed, the output shaft 2 revolves and rotates for one circle, the external gear 6 drives the driving wheel 15 to rotate for one circle, the eccentric output of the external gear and the driving wheel is utilized to drive the rolling sleeve to overcome the elastic force of the reset spring 10 to push the plunger pump core upwards to form a high-pressure jacking oil outlet valve core 14 when the rotating eccentric amount of the rolling sleeve is maximum, high-pressure oil is output, and when the external gear 6 and the driving wheel 15 fall back to the eccentric amount of the plunger pump core 11, the reset spring drives the plunger pump core 11 to reset and absorb oil, and the oil is completed.
Claims (7)
1. An electrically driven gear driven plunger pump, characterized in that: the device comprises a motor, a small-tooth-difference speed reduction transmission mechanism and a plunger pump body, wherein the input end of the small-tooth-difference speed reduction transmission mechanism is connected with an output shaft of the motor, and the output end of the small-tooth-difference speed reduction transmission mechanism eccentrically rotates and is connected with a plunger pump core in the plunger pump body so as to drive the plunger pump core to reciprocate in a straight line in the plunger pump body;
an eccentric bearing is fixedly arranged on an output shaft of the motor, an outer gear is fixedly arranged on an outer ring of the eccentric bearing, one end, far away from the motor, of the outer gear is also coaxially provided with a driving wheel, the outer gear is meshed with an inner gear ring fixedly arranged on an output shaft end cover of the motor on one side of the output shaft of the motor, the driving wheel is connected with a plunger pump core, the eccentric bearing, the outer gear, the driving wheel and the inner gear ring form a small-tooth-difference speed reduction transmission mechanism, the input end of the small-tooth-difference speed reduction transmission mechanism is a motor output shaft, and the output end of the small-tooth-difference speed reduction transmission mechanism is a driving wheel;
the external gear and the driving wheel are integrally formed; the external gear is arranged on the outer ring of the eccentric bearing in an interference manner;
the plunger pump body comprises a plunger pump seat with a first cavity, a plunger pump housing which is arranged in the first cavity in a sealing manner and is provided with a second cavity, and a spring base sleeve which is arranged at the bottom of the first cavity in a vertical sliding manner, wherein the plunger pump core is arranged in the second cavity in a vertical sliding manner, an oil outlet is arranged at the top of the second cavity, the upper end of the plunger pump core is surrounded with the upper wall of the second cavity and the side wall of the second cavity to form a pump oil chamber, the side wall of the plunger pump housing and the side wall of the plunger pump seat corresponding to the pump oil chamber are provided with communicated oil suction ports for sucking oil, the lower end of the plunger pump core is fixed on the spring base sleeve, a reset spring is connected between the spring base sleeve and the plunger pump housing or the plunger pump seat, and the bottom surface of the spring base sleeve is in butt joint with a driving wheel.
2. An electrically driven geared plunger pump as claimed in claim 1 wherein: the bottom of the plunger pump seat is arranged in a reducer output supporting cover which is of a semi-surrounding structure, and the reducer output supporting cover, an end cover of a motor output shaft and the plunger pump seat are closed to form a containing cavity for containing the driving wheel to eccentrically rotate.
3. An electrically driven geared plunger pump as claimed in claim 2 wherein: the driving wheel is provided with a through hole for the output shaft of the motor to pass through in the axial direction, a bearing which is coaxial with the output shaft of the motor is fixedly arranged in the output support cover of the speed reducer, and the tail end of the output shaft of the motor is arranged in the bearing after passing through the through hole.
4. An electrically driven geared plunger pump as claimed in claim 1 wherein: the outer peripheral surface of the driving wheel is sleeved with a rolling sleeve with a protection function, and the outer peripheral surface of the rolling sleeve is abutted against the bottom surface of the spring base sleeve.
5. An electrically driven geared plunger pump as claimed in claim 1 wherein: the spring base sleeve is of a box-shaped structure with an open upper end, the lower end of the plunger pump core is fixed on the inner bottom surface of the spring base sleeve, the outer wall of the lower portion of the plunger pump housing is provided with a step surface, one end of the return spring is abutted to the inner bottom surface of the spring base sleeve, the other end of the return spring is abutted to the step surface, and a gap for the return spring to stretch out and draw back is formed in the plunger pump base.
6. An electrically driven geared plunger pump as claimed in claim 5 wherein: the plunger pump core and the return spring are coaxially arranged, and the lower part of the plunger pump core is inserted into the return spring.
7. An electrically driven geared plunger pump as claimed in claim 1 wherein: an oil outlet valve seat with an oil outlet valve core is arranged at the top of the second cavity, the upper end of the plunger pump core, the lower end of the oil outlet valve seat and the side wall of the second cavity are surrounded to form an oil pumping chamber, and the oil outlet valve core is connected with an oil outlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811252796.4A CN109281813B (en) | 2018-10-25 | 2018-10-25 | Electrically driven gear transmission plunger pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811252796.4A CN109281813B (en) | 2018-10-25 | 2018-10-25 | Electrically driven gear transmission plunger pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109281813A CN109281813A (en) | 2019-01-29 |
| CN109281813B true CN109281813B (en) | 2023-10-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811252796.4A Active CN109281813B (en) | 2018-10-25 | 2018-10-25 | Electrically driven gear transmission plunger pump |
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| CN (1) | CN109281813B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113541366B (en) * | 2020-04-22 | 2022-09-20 | 易码电控股份有限公司 | Motor set and motor brake device |
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| CN202441677U (en) * | 2011-12-29 | 2012-09-19 | 济南大学 | Minisize electromagnetic pulse-type hydraulic driving system |
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| CN108533471A (en) * | 2017-03-03 | 2018-09-14 | 苏州宝时得电动工具有限公司 | Handheld high-voltage cleaning machine |
| CN208858504U (en) * | 2018-10-25 | 2019-05-14 | 温州市基安机械有限公司 | A kind of integrated plunger pump of decelerating through motor |
| WO2022134897A1 (en) * | 2020-12-24 | 2022-06-30 | 绿田机械股份有限公司 | Power output apparatus for high-pressure cleaning machine |
-
2018
- 2018-10-25 CN CN201811252796.4A patent/CN109281813B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202441677U (en) * | 2011-12-29 | 2012-09-19 | 济南大学 | Minisize electromagnetic pulse-type hydraulic driving system |
| CN103388638A (en) * | 2012-05-11 | 2013-11-13 | 株式会社万都 | Electronic disc brake |
| CN203362428U (en) * | 2013-06-09 | 2013-12-25 | 韩竞飞 | Single-eccentric-shaft single-plunger double-cylinder high-pressure pump |
| CN108533471A (en) * | 2017-03-03 | 2018-09-14 | 苏州宝时得电动工具有限公司 | Handheld high-voltage cleaning machine |
| CN208858504U (en) * | 2018-10-25 | 2019-05-14 | 温州市基安机械有限公司 | A kind of integrated plunger pump of decelerating through motor |
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| CN109281813A (en) | 2019-01-29 |
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