CN213623109U - Support device with differential mechanism transmission - Google Patents
Support device with differential mechanism transmission Download PDFInfo
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- CN213623109U CN213623109U CN202021846716.0U CN202021846716U CN213623109U CN 213623109 U CN213623109 U CN 213623109U CN 202021846716 U CN202021846716 U CN 202021846716U CN 213623109 U CN213623109 U CN 213623109U
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- lead screw
- gear set
- planetary gear
- differential mechanism
- ring
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Abstract
The utility model provides a supporting device with differential mechanism transmission, which is a seat body provided with a transmission device at the middle section position of a base, and a differential mechanism arranged in the seat body comprises a ring gear driven by a driving part, a first planetary gear set, a central gear and a second planetary gear set, wherein the two sides of the first planetary gear set and the second planetary gear set are coaxially connected with a first guide screw rod and a second guide screw rod, and a first actuating part and a second actuating part which are respectively screwed on the first guide screw rod and the second guide screw rod are pivoted with a supporting leg of the supporting device, when the ring gear drives the first planetary gear set to rotate, the order of carrying out unilateral transmission between the first guide screw rod and the second guide screw rod can be determined according to the resistance received by the central gear and the second planetary gear set, so as to respectively drive the supporting leg to outwards expand to support on uneven ground, thereby achieving the purpose of stable support and having the effects of simple structure, small volume and cost reduction.
Description
Technical Field
The utility model relates to a supporting device with differential mechanism transmission indicates the transmission of base middle section position installation especially, can decide the unilateral driven order of the lead screw of two sides according to the resistance size that its two planetary gear set received to drive two supporting legss respectively and outwards expand and support in uneven subaerial, and then promote the stability of supporting.
Background
Along with the improvement of the living quality of modern people, how many people want to relax in mind and moderate pressure in busy daily life, work and other various tenses and pressures is always one of the living modes pursued by modern people, more diversified choices are provided for the arrangement of holidays, except for amusement places, tourist attractions, restaurants, residents or residents and the like, in recent years, more and more people have more and more environments for advocating the nature, and the people choose to perform camping activities outdoors to experience a life mode different from daily life modes, so that the aims of relaxing leisure and relieving pressure are fulfilled.
Because camping tides are more prevalent, in order to meet the needs of outdoor food and lodging, common campers are mostly provided with living spaces such as kitchens, living rooms, bedrooms and the like, and are fully equipped in the vehicle body, so the utility model is very suitable for small families who often play water and love camping, and in order to stabilize vehicles when the campers are parked, jacks are generally used for being lifted to be supported on the bottom of the vehicles, so as to prevent the campers from swinging or shaking when passengers move in the vehicle body, while when the traditional jacks are used, a vehicle owner needs to walk around to manually operate a plurality of jacks to stabilize the vehicles on the ground, the manual operation mode is difficult, time and labor are wasted, and particularly at night or in adverse weather conditions, the operators can push out the electric jacks, install the electric jacks on the bottom at the rear of the vehicles, and can perform bilateral transmission by means of the motor-driven bidirectional lead screws, the two supporting feet are driven to descend and support on the ground to stabilize the vehicle, but the lead screw performs bilateral transmission by using the bidirectional screw with positive and negative teeth, so that the problems of difficult manufacture and higher cost are solved, and the motor is arranged at the end part of the lead screw, and the actuation stroke of the motor also occupies larger volume, so that the motor needs to be redesigned by a worker to solve the problem.
SUMMERY OF THE UTILITY MODEL
Therefore, in view of the above-mentioned shortcomings, the present invention provides a novel patent for designing a supporting device with a differential mechanism transmission, which is based on the evaluation and consideration of various aspects and by the continuous trial and modification of years of experience in the industry.
In order to achieve the above object, the utility model adopts the following technical scheme:
a support device with differential drive, comprising:
a base;
a base body of a transmission device is arranged at the middle section of the base, a differential mechanism arranged in the base body comprises a ring gear driven by a driving part, a first planetary gear set, a central gear and a second planetary gear set, two sides of the first planetary gear set and the second planetary gear set are respectively and coaxially connected with a first lead screw and a second lead screw which have the same thread direction, and the first lead screw and the second lead screw are respectively screwed with a first actuating part and a second actuating part which can linearly displace; and
when the ring gear of the differential mechanism drives the first planetary gear set to rotate, the order of the first lead screw and the second lead screw in single-side transmission is determined by matching the central gear and the second planetary gear set according to the resistance applied by the central gear and the second planetary gear set, so as to drive the supporting legs to expand or retract respectively.
The supporting device with the differential mechanism transmission is characterized in that: the base comprises a mounting frame fixed at the bottom of a vehicle, front and back opposite side wall plates are arranged in the mounting frame along the width direction, and a guide rail groove is formed between the mounting frame and the side wall plates along the length direction so that a first actuating part of the first lead screw and a second actuating part of the second lead screw are linearly displaced in the guide rail groove.
The supporting device with the differential mechanism transmission is characterized in that: the mounting frame of the base is provided with connecting seats for the first lead screw and the second lead screw to be pivoted at the left side and the right side of the guide rail groove respectively.
The supporting device with the differential mechanism transmission is characterized in that: the middle sections of the two supporting legs of the supporting mechanism are respectively pivoted with a supporting rod, and one ends of the two supporting rods opposite to the supporting legs are respectively pivoted on the connecting seat so as to enable the two supporting rods to respectively take the action of outward expansion or inward retraction by taking the connecting seat as an axis.
The supporting device with the differential mechanism transmission is characterized in that: the seat body of the transmission device is externally combined with a motor of the driving part, a driving shaft extending into the seat body is arranged at one side of the motor, and the driving shaft is meshed with a gear set used for driving the ring gear of the differential mechanism to rotate.
The supporting device with the differential mechanism transmission is characterized in that: the differential mechanism of the transmission device is combined with a first inner gear ring which is meshed with a plurality of planet gears of the first planetary gear set on the inner ring surface of the ring gear, a first output shaft is axially connected at one side of the axes of the plurality of planet gears, one end of the first output shaft is coaxially connected with the first lead screw, one side of the central gear is meshed between the plurality of planet gears, and is meshed between the plurality of planet gears of the second planetary gear set from the other side, a second output shaft is axially connected at one side of the plurality of planet gears, which is opposite to the first planetary gear set, for being coaxially connected with the second lead screw, and a second inner gear ring which is combined in the seat body and is kept fixed is meshed with the planet gears of the second planetary gear set.
The supporting device with the differential mechanism transmission is characterized in that: the central gear of the differential mechanism is sleeved with a gasket which is positioned between the first inner gear ring and the second inner gear ring and used for being abutted against the surface of the ring gear in the lateral direction.
The supporting device with the differential mechanism transmission is characterized in that: one end of the first lead screw and one end of the second lead screw of the transmission device are respectively sleeved with a retaining ring near the first output shaft and the second output shaft, and the other ends of the first lead screw and the second lead screw are respectively provided with a rotating part for driving the first lead screw and the second lead screw to rotate.
The main advantage of the present invention is that the supporting device can be fixed to the bottom of the vehicle or other suitable positions by using the base, the differential mechanism installed in the middle section of the base and disposed in the seat body of the transmission device comprises a ring gear driven by a driving part, a first planetary gear set, a sun gear and a second planetary gear set, and a first lead screw and a second lead screw are coaxially connected to both sides of the first planetary gear set and the second planetary gear set, and a first actuating part and a second actuating part, which are respectively screwed on the first lead screw and the second lead screw, are pivoted with the supporting legs of the supporting device, when the ring gear of the differential mechanism drives the first planetary gear set to rotate, the order of performing single-side transmission by matching the sun gear and the second planetary gear set is determined according to the resistance received by the first lead screw or the second lead screw, so as to respectively drive the supporting legs to expand outwards to support on uneven ground, thereby achieving the purpose of stably supporting when the vehicle is parked.
The utility model discloses a secondary advantage lies in that transmission's first planetary gear set can cooperate sun gear and second planetary gear set, make first driving screw and second driving screw drive supporting legs of supporting mechanism respectively and do the action of expansion or withdrawing, and adjustable and compensation support the foot support and support in uneven subaerial, and because of the screw direction of first driving screw and second driving screw is the same, can avoid single driving screw to carry out bilateral transmission because of positive and negative tooth two-way screw and lead to making difficulty and the higher problem of cost, and have simple structure, the effect of volume miniaturization and cost reduction.
Another advantage of the present invention is that when the driving portion of the transmission device drives the ring gear of the differential mechanism to rotate, since only one of the first lead screw and the second lead screw can drive the first lead screw, if the second lead screw can not rotate due to a large resistance, the central gear engaged with the second planetary gear set can not rotate, so that the first planetary gear set can rotate and rotate along the central gear, and the first lead screw can drive one of the supporting legs of the supporting mechanism to descend to support on the ground and then stop rotating, at this time, the first planetary gear set can only rotate to reversely drive the central gear to rotate the second planetary gear set along the fixed second inner ring gear, so that the second lead screw can drive the other supporting leg of the supporting mechanism to descend to support on the ground, until the load current borne by the motor of the driving portion is greater than the rated current, the motor can stop running when bearing overload current by using a current limiting protection mode.
Drawings
Fig. 1 is a perspective view of the preferred embodiment of the present invention.
Fig. 2 is a side sectional view of the preferred embodiment of the present invention.
Fig. 3 is an exploded perspective view of the transmission of the present invention.
Fig. 4 is a side view of the preferred embodiment of the present invention before deployment.
Fig. 5 is a side view of the preferred embodiment of the invention when deployed.
Fig. 6 is a side sectional view (i) of the transmission device of the present invention in operation.
Fig. 7 is a side sectional view (ii) of the transmission device of the present invention in operation.
Fig. 8 is a side view of the preferred embodiment of the present invention after deployment.
Description of reference numerals: 1-a base; 11-a mounting frame; 111-side wall panels; 112-guide rail groove; 12-a connecting seat; 2-a transmission device; 21-a seat body; 211-a housing; 22-a differential mechanism; 221-a ring gear; 2211-first inner toothed ring; 222-a first planetary gear set; 2221-planetary gear; 2222-first output shaft; 2223-bearings; 2224-a spacer; 2225-connecting member; 223-sun gear; 2231-a first tooth; 2232-a second tooth; 2233-a spacer; 224-a second planetary gear set; 2241-a planetary gear; 2242-a second output shaft; 2243-a second internal gear ring; 2244-bearing; 2245-a connector; 23-a drive section; 231-a motor; 2311-a drive shaft; 232-gear set; 24-a first lead screw; 241-a first actuating portion; 242-a retaining ring; 243-the rotating member; 25-a second lead screw; 251-a second actuating portion; 252-a retainer ring; 253-a rotating member; 3-a support mechanism; 31-supporting feet; 311-strut; 312-foot seat; 32-supporting feet; 321-a strut; 322-foot seat.
Detailed Description
To achieve the above objects and advantages of the present invention, the present invention provides a technical means and structure, which is illustrated in detail in the following for the purpose of fully understanding the structure and function of the preferred embodiments of the present invention.
Referring to fig. 1 to 4, which are a perspective view, a side sectional view, an exploded perspective view of the transmission device, and a side view of the preferred embodiment before being unfolded, respectively, it can be clearly seen from the drawings that the supporting device with differential transmission of the present invention comprises a base 1, a transmission device 2, and a supporting mechanism 3, wherein:
the base 1 includes a cross-beam type mounting frame 11, and front and rear opposite side wall plates 111 are provided in the mounting frame 11 along the width direction, and a guide rail groove 112 having an opening at the lower portion is formed between the mounting frame 11 and the side wall plates 111 along the length direction, and connection seats 12 are provided at the left and right sides of the guide rail groove 112, respectively.
The transmission device 2 has a base 21 installed at the middle section inside the installation frame 11, the base 21 includes two left and right opposite housings 211, a differential mechanism 22 is disposed inside the housings 211, a driving portion 23 is combined outside the base 21, a driving shaft 2311 extending into the base 21 is disposed at one side of a motor 231 of the driving portion 23, and the driving shaft 2311 (e.g., a driving wheel combined with a worm or a shaft rod) is engaged with a gear set 232 (e.g., a worm wheel or a driven wheel) for driving the differential mechanism 22 to rotate.
The differential mechanism 22 in this embodiment includes a ring gear 221, a first planetary gear set 222, a sun gear 223 and a second planetary gear set 224, which are engaged with the gear set 232, and a first inner ring 2211 is combined on the inner ring surface of the ring gear 221, and the first planetary gear set 222, which is engaged with the first inner ring 2211, includes a plurality of planetary gears 2221, and a first output shaft 2222 is axially connected to one side of the axial center of the three planetary gears 2221, and a bearing 2223 and a spacer 2224 abutting against one side surface of the ring gear 221 are mounted on the first output shaft 2222, and the sun gear 223 has a first tooth 2231 at one side of the axial center engaged between the three planetary gears 2221 of the first planetary gear set 222, and a second tooth 2232 at the other side of the axial center gear 223 is engaged between the plurality of planetary gears 2241 included in the second planetary gear set 224, and the axial center of the three planetary gears 2241 is axially connected to the other side of the first planetary gear set 222, a second inner ring 2243 engaged with the three planetary gears 2241 and fixed in the housing 211 of the base 21 is further disposed on the sun gear 223, a spacer 2233 is disposed between the second inner ring 2243 and the first inner ring 2211 and abuts against the other side surface of the ring gear 221, and a bearing 2244 is mounted on the second output shaft 2242.
In addition, one end of the first output shaft 2222 of the first planetary gear set 222 and one end of the second output shaft 2242 of the second planetary gear set 224 are respectively connected to the first lead screw 24 and the second lead screw 25 with the same thread direction (such as right-handed threads) by the connecting members 2225 and 2245, respectively, the first actuating portion 241 and the second actuating portion 251 located in the guide groove 112 of the mounting frame 11 are respectively screwed on the first lead screw 24 and the second lead screw 25, and the other ends of the first lead screw 24 and the second lead screw 25 are respectively pivoted on the connecting base 12, while one ends of the first lead screw 24 and the second lead screw 25 are respectively sleeved with the retaining rings 242 and 252 at the positions close to the first output shaft 2222 and the second output shaft 2242, and the other ends of the first lead screw 24 and the second lead screw 25 are respectively provided with the rotating members 243 and 253, so that a hand crank can be abutted with the rotating members 243 and 253 by a user, so as to drive the first lead screw 24 or the second lead screw 25 to rotate.
The supporting mechanism 3 includes at least two supporting legs 31, 32 pivotally connected to the first actuating portion 241 of the first guiding screw 24 and the second actuating portion 251 of the second guiding screw 25, respectively, and two supporting rods 311, 321 having a shorter length than the supporting legs 31, 32 are pivotally connected to middle sections of the two supporting legs 31, 32, respectively, to form a y-shaped connecting rod, and the other ends of the two supporting rods 311, 321 opposite to the supporting legs 31, 32 are pivotally connected to the corresponding connecting base 12, and the other ends of the supporting legs 31, 32 are pivotally connected to the bases 312, 322, respectively.
Please refer to fig. 5-8, which are a side view of the preferred embodiment of the present invention, a side view of the transmission device when the transmission device is activated, (i) to (ii), and a side view of the preferred embodiment when the transmission device is activated, respectively, as can be clearly seen from the drawings, the supporting device with differential transmission of the present invention is preferably applied to a Camper (retrieval Vehicle), which includes but is not limited to a self-propelled Camper (Motorhome), a towed/Camper (Travel Trailer; caran) or a loading/Camper (Truck cab; Motorcoach), and is fixed to the rear bottom of the Vehicle or other suitable positions by the mounting frame 11 of the base 1, and can also be applied to related devices or equipment (such as a crane) that need stable support.
When the supporting device is used to stabilize the vehicle, the driving portion 23 of the transmission 2 can drive the ring gear 221 of the differential mechanism 22 to rotate in a first direction, the first inner ring 2211 drives the plurality of planet gears 2221 of the first planetary gear set 222 to rotate in the same direction, since the thread directions of the first lead screw 24 and the second lead screw 25 are the same, and at the initial position where the first actuating portion 241 and the second actuating portion 251 are close to each other, if the rotation resistance of the first lead screw 24 is smaller than that of the second lead screw 25, the axes of the plurality of planet gears 2221 of the first planetary gear set 222 will drive the first output shaft 2222 to rotate in the same direction, and the first lead screw 24 is linked to make the first actuating portion 241 linearly displace outwards along the first lead screw, and the second actuating portion 251 of the second lead screw 25 is limited by the retainer ring 252 and cannot linearly displace inwards, so only one lead screw can continuously transmit.
At this time, if the second lead screw 25 cannot rotate, the central gear 223 engaged with the second planetary gear set 224 cannot rotate, the plural planetary gears 2221 of the first planetary gear set 222 will rotate and rotate along the central gear 223, and the axis of the plural planetary gears 2221 will drive the first output shaft 2222 to rotate in the same direction, so as to drive the first lead screw 24 to rotate and push against the first actuating portion 241 to drive one of the supporting legs 31 of the supporting mechanism 3 to descend, and at the same time, the supporting rod 311 will perform an outward expanding motion with the connecting seat 12 as the axis, and after the foot seat 312 is supported on the ground, the first lead screw 24 will stop rotating under a large resistance.
Since the first lead screw 24 of the transmission device 2 stops rotating and the first output shaft 2222 of the first planetary gear set 222 cannot rotate, when the rotation resistance of the second lead screw 25 is smaller than the rotation resistance of the first lead screw 24, the plurality of planetary gears 2221 of the first planetary gear set 222 will rotate and reversely drive the central gear 223 to make the plurality of planetary gears 2241 of the second planetary gear set 224 rotate along the second inner ring 2243 fixed thereto, and at the same time, the axis of the plurality of planetary gears 2241 will drive the second output shaft 2242 to rotate in the second direction (i.e. opposite to the first direction of the rotation of the ring gear 221), so as to drive the second lead screw 25 to rotate and push against the second operating part 251 to drive the other supporting leg 32 of the supporting mechanism 3 to descend, and make the supporting rod 321 take the connecting seat 12 as the axis to expand outwards, and after the foot seat 322 is supported on the ground, the second lead screw 25 is also subjected to a large resistance, and stops operating until the load current received by the motor 231 of the driving unit 23 is larger than the rated current.
In addition, when the user needs to retract the supporting device to move the vehicle, the driving portion 23 can drive the ring gear 221 of the differential mechanism 22 to rotate reversely in the second direction and drive the plurality of planet gears 2221 of the first planetary gear set 222 to rotate, if the resistance of the second lead screw 25 driven by the gears is smaller than that of the first lead screw 24, the second lead screw 25 can be driven by a single side, that is, the plurality of planet gears 2221 of the first planetary gear set 222 will rotate and reversely drive the sun gear 223 to rotate the plurality of planet gears 2241 of the second planetary gear set 224 along the second inner ring 2243, so as to link the second output shaft 2242 to rotate the second lead screw 25 in the first direction, and the second lead screw 25 will rotate and push against the second operating portion 251 to drive one of the supporting legs 32 of the supporting mechanism 3 to ascend, and can retract inward by using the connecting seat 12 as the axis through the supporting rod 321, until the second actuating portion 251 is abutted against the retaining ring 252 and receives a larger resistance, and the central gear 223 cannot rotate, the resistance of the first lead screw 24 driven by the gear is smaller than that of the first lead screw 24, at this time, the plurality of planet gears 2221 of the first planetary gear set 222 drives the first output shaft 2222 to rotate in the second direction, so as to interlock the first lead screw 24 to rotate and push against the first actuating portion 241 to drive the other supporting leg 31 of the supporting mechanism 3 to ascend, and to make the supporting rod 311 retract inward with the connecting seat 12 as the axis, until the first actuating portion 241 is abutted against the retaining ring 242 to cause the first lead screw 24 to receive a larger resistance, the motor 231 can be stopped when receiving an overload current by using the above-mentioned current limiting protection method.
Therefore, the present invention mainly provides a supporting device, which can be fixed to the bottom of a vehicle or other suitable positions by using a base 1, and when a driving portion 23 of a transmission device 2 drives a ring gear 221 of a differential mechanism 22 to rotate, a first planetary gear set 222 can cooperate with a sun gear 223 and a second planetary gear set 224 to determine the order of single-side transmission between a first lead screw 24 and a second lead screw 25 according to the resistance received by the first and second planetary gear sets, so as to drive supporting legs 31 and 32 of a supporting mechanism 3 to extend outwards or retract inwards, and to adjust and compensate the supporting legs 31 and 32 to support on uneven ground, thereby achieving the purpose of stable support when the vehicle is parked, and because the thread directions of the first lead screw 24 and the second lead screw 25 are the same, the problems of difficult manufacture and high cost caused by double-side transmission between a positive and negative two-way thread of a single lead screw can be avoided, and has the effects of simple structure, small size and low cost.
The foregoing description is intended to be illustrative rather than limiting, and it will be appreciated by those skilled in the art that many modifications, variations or equivalents may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (8)
1. A support device with differential drive, comprising:
a base;
a base body of a transmission device is arranged at the middle section of the base, a differential mechanism arranged in the base body comprises a ring gear driven by a driving part, a first planetary gear set, a central gear and a second planetary gear set, two sides of the first planetary gear set and the second planetary gear set are respectively and coaxially connected with a first lead screw and a second lead screw which have the same thread direction, and the first lead screw and the second lead screw are respectively screwed with a first actuating part and a second actuating part which can linearly displace; and
when the ring gear of the differential mechanism drives the first planetary gear set to rotate, the order of the first lead screw and the second lead screw in single-side transmission is determined by matching the central gear and the second planetary gear set according to the resistance applied by the central gear and the second planetary gear set, so as to drive the supporting legs to expand or retract respectively.
2. The support device with differential mechanism transmission of claim 1, wherein: the base comprises a mounting frame fixed at the bottom of a vehicle, front and back opposite side wall plates are arranged in the mounting frame along the width direction, and a guide rail groove is formed between the mounting frame and the side wall plates along the length direction so that a first actuating part of the first lead screw and a second actuating part of the second lead screw are linearly displaced in the guide rail groove.
3. The support device with differential mechanism transmission of claim 2, wherein: the mounting frame of the base is provided with connecting seats for the first lead screw and the second lead screw to be pivoted at the left side and the right side of the guide rail groove respectively.
4. The support device with differential drive of claim 3, wherein: the middle sections of the two supporting legs of the supporting mechanism are respectively pivoted with a supporting rod, and one ends of the two supporting rods opposite to the supporting legs are respectively pivoted on the connecting seat so as to enable the two supporting rods to respectively take the action of outward expansion or inward retraction by taking the connecting seat as an axis.
5. The support device with differential mechanism transmission of claim 1, wherein: the seat body of the transmission device is externally combined with a motor of the driving part, a driving shaft extending into the seat body is arranged at one side of the motor, and the driving shaft is meshed with a gear set used for driving the ring gear of the differential mechanism to rotate.
6. The support device with differential mechanism transmission of claim 1, wherein: the differential mechanism of the transmission device is combined with a first inner gear ring which is meshed with a plurality of planet gears of the first planetary gear set on the inner ring surface of the ring gear, a first output shaft is axially connected at one side of the axes of the plurality of planet gears, one end of the first output shaft is coaxially connected with the first lead screw, one side of the central gear is meshed between the plurality of planet gears, and is meshed between the plurality of planet gears of the second planetary gear set from the other side, a second output shaft is axially connected at one side of the plurality of planet gears, which is opposite to the first planetary gear set, for being coaxially connected with the second lead screw, and a second inner gear ring which is combined in the seat body and is kept fixed is meshed with the planet gears of the second planetary gear set.
7. The support device with differential drive of claim 6, wherein: the central gear of the differential mechanism is sleeved with a gasket which is positioned between the first inner gear ring and the second inner gear ring and used for being abutted against the surface of the ring gear in the lateral direction.
8. The support device with differential drive of claim 6, wherein: one end of the first lead screw and one end of the second lead screw of the transmission device are respectively sleeved with a retaining ring near the first output shaft and the second output shaft, and the other ends of the first lead screw and the second lead screw are respectively provided with a rotating part for driving the first lead screw and the second lead screw to rotate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021846716.0U CN213623109U (en) | 2020-08-28 | 2020-08-28 | Support device with differential mechanism transmission |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021846716.0U CN213623109U (en) | 2020-08-28 | 2020-08-28 | Support device with differential mechanism transmission |
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| Publication Number | Publication Date |
|---|---|
| CN213623109U true CN213623109U (en) | 2021-07-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021846716.0U Active CN213623109U (en) | 2020-08-28 | 2020-08-28 | Support device with differential mechanism transmission |
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| Country | Link |
|---|---|
| CN (1) | CN213623109U (en) |
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2020
- 2020-08-28 CN CN202021846716.0U patent/CN213623109U/en active Active
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