CN214059719U - Screw lifting mechanism - Google Patents

Abstract

The utility model discloses a lead screw lifting mechanism, which comprises a motor, a shell, a motor connector, a gas spring assembly, a lead screw assembly and a transmission assembly; the screw assembly consists of a primary screw, a secondary screw and a tertiary screw, the upper end of the screw assembly is fixed, the lower end of the screw assembly is connected with a transmission assembly, the transmission assembly is driven by a motor, and the transmission assembly and the motor are fixed through a motor connector; the gas spring assembly is fixed inside the lead screw assembly. Through the mode, the lifting is realized by adopting the three-level screw rod mechanism, and the self height of the screw rod lifting mechanism is greatly reduced under the condition of fixed stroke height; the gas spring assembly is adopted, and the screw rod mechanism is assisted to rapidly lift through the self tension, so that the time is saved, and the power required by motor driving is reduced.

Description

Screw lifting mechanism

Technical Field

The utility model relates to an elevating system especially relates to an use lead screw elevating system on small-size new energy automobile group battery.

Background

At present, in a small new energy automobile, charging schemes of battery pack modules are mainly divided into a charging scheme and a scheme of replacing battery modules. The charging scheme requires long charging time and has great influence on the service life of the battery, so the scheme of replacing the battery module is adopted more.

By adopting the scheme of replacing the battery module, facilities similar to a gas station can be developed to carry out centralized management on the battery pack, the battery pack is recycled, meanwhile, the battery replacement time is far shorter than the time required by the charging scheme, and the influence of quick charging on the service life of the battery can be avoided.

The scheme for replacing the battery module is that the battery pack is positioned below a carriage chassis, the battery pack is lifted and locked at the bottom of the carriage through a lifting mechanism during normal running, and when the battery pack is replaced, the battery pack is lowered to a specified position through the lifting mechanism, and the battery is taken out and replaced. Because the wheel is less, and the chassis is lower, and battery pack module thickness is great, is close vehicle ground clearance, and the space below carriage chassis is limited simultaneously, consequently has higher requirement to battery lifting mechanism's height stroke ratio. Secondly, the battery pack has a large mass, and a lifting mechanism is required to provide sufficient lifting force during the lifting process of the battery pack. In addition, in order to ensure that the battery pack is always in a fixed position when the vehicle has uncertain factors such as jolt during driving, a certain self-locking capacity is required when the battery box is lifted to the retracted state.

The prior art discloses a lifting mechanism, this mechanism includes first bracing piece, drive assembly, adsorption component, the second transfer line, the connecting rod, two movable blocks and two first transfer lines, when the group battery of car broke down and need maintain, through drive assembly drive two movable blocks along the direction of first bracing piece move in opposite directions or back of the body mutually, when two movable blocks move in opposite directions, drive the decline of second transfer line through two first transfer lines, when two movable blocks move in back of the body mutually, through two first transfer lines drive the second transfer line and rise, when the second transfer line goes up and down, through the lift of connecting rod drive adsorption component to catch the group battery or loosen through adsorption component. However, the mechanism needs a motor with larger power to ensure enough lift force, and the mechanism is too long in body structure in order to ensure enough ascending distance and is not beneficial to installation in a narrow space under a carriage chassis.

Therefore, it is necessary to design a lifting mechanism that can reduce the height of the lifting mechanism in the stowed state as much as possible while satisfying the stroke required for lifting the battery box. The lifting mechanism is additionally provided with an air spring structure capable of providing upward thrust, so that a larger upward lift force is provided under the condition of not changing the output power of the motor. Meanwhile, the mechanism has a self-locking function when in a folding state, so that the battery box can keep a fixed position.

SUMMERY OF THE UTILITY MODEL

In order to overcome current elevating system under the condition of guaranteeing the required stroke of lift, self mechanism highly too high, the too big problem of the required motor power of thrust, the utility model provides a lead screw elevating system adopts threaded connection's syllogic lead screw assembly, and is fixed with the lead screw assembly upper end, and the lower extreme is connected with drive assembly, drive assembly passes through the motor connector with the motor and is connected, the inside cavity of lead screw assembly is provided with air spring assembly.

In order to achieve the above object, the utility model adopts the following technical scheme:

a lead screw lifting mechanism comprises a motor, a shell, a motor connector, a gas spring assembly, a lead screw assembly and a transmission assembly; the lead screw component comprises one-level lead screw, a second-level lead screw and a third-level lead screw, the external thread of the third-level lead screw is matched with the internal thread of the second-level lead screw, the upper end of the third-level lead screw is fixed, and the external thread of the second-level lead screw is matched with the internal thread of the first-level lead screw.

Furthermore, the transmission assembly consists of a driving shaft and a driven shaft, the driving shaft is a worm, and the worm is in shaft key connection with a motor; the driven shaft is composed of a sleeve and a worm wheel positioned on the outer side of the sleeve, the sleeve and the worm wheel are fixedly molded into an integrated structural component, and the worm is meshed with the worm wheel.

Further, the sleeve is a first-level lead screw, and the inner thread of the sleeve is matched with the outer thread of the second-level lead screw.

Furthermore, the gas spring assembly is positioned inside the lead screw assembly and consists of a first-stage gas spring, a second-stage gas spring and a third-stage gas spring, and the first-stage gas spring is an innermost lead screw; the second-stage air spring is of a hollow shaft shell structure, a first piston is fixed at the upper end of the second-stage air spring, a circumferential groove hole is formed in the middle of the first piston, a first rubber ring is fixed on the groove hole, the first piston is matched with the first-stage air spring, and a circular hole in the bottom end of the first-stage air spring is in close fit with the second-stage air spring penetrating through the circular hole; the three-level air spring is located inside the two-level air spring, a piston II is fixed to the upper end of the three-level air spring, a circumferential groove hole is formed in the middle of the piston II, a rubber ring II is fixed to the groove hole, the piston II is matched with the two-level air spring, a circular hole is formed in the bottom end of the two-level air spring and penetrates through the circular hole, the three-level air spring is in airtight fit, and the lower end of the three-level air spring is in threaded connection with the central position of the driven shaft bottom plate.

Furthermore, the driving shaft is transversely fixed in the shell, the driven shaft vertically penetrates through the shell, the bottom plate of the driven shaft is fixed on the bottom cover, the bottom cover is fixed at the lower end of the shell in a matched mode, and a rubber ring is fixed at the matched position of the driven shaft and the upper end of the shell.

Further, the gas spring assembly is connected with a gas tank, a first slotted hole is formed in the side face of the shell, a second slotted hole is formed in the bottom end of the bottom cover, the gas tank is connected with a gas tank guide pipe at the opening of the gas tank, and the other end of the gas tank guide pipe sequentially penetrates through the first slotted hole, the second slotted hole and the bottom end opening of the three-level gas spring to be hermetically connected.

Furthermore, a first vent hole is formed in the position, close to the lower portion of the first piston, of the second-stage gas spring, and a second vent hole is formed in the position, close to the lower portion of the second piston, of the third-stage gas spring.

Further, the motor and the transmission assembly are connected through a motor connector, and the other side of the motor connector is fixed on the shell.

Further, bearings are fixed at two ends of the worm, and oil seals are arranged on the outer sides of the bearings.

Furthermore, the upper end of the screw rod lifting mechanism is fixed on the lower side of the chassis of the vehicle body, the lower end of the screw rod lifting mechanism is fixed on the battery pack supporting plate, and the screw rod lifting mechanism is respectively positioned at four corners of the battery pack supporting plate.

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

1. the utility model discloses a lead screw elevating system increases one-level lead screw elevating system again on second grade lead screw elevating system's basis, under the high certain condition of assurance stroke, tertiary lead screw elevating system compares in second grade lead screw elevating system, when mechanism is in the state of packing up, lead screw mechanism's structure height can reduce by half.

2. The utility model discloses a lead screw elevating system has added air spring assembly in inside, air spring assembly uses the innermost lead screw as one-level air spring structure, air spring assembly provides upward pulling force to overall structure, offsets partial gravity influence through the pulling force of air spring when the group battery descends, avoids the group battery to descend too fast; the battery pack provides upward pulling force when rising, reduces pulling force provided by the motor required when rising, and reduces power required by the motor.

3. The utility model discloses a lead screw elevating system is provided with the gas pitcher of being connected with gas spring assembly, all is provided with the air vent on gas spring assembly's second grade gas spring and tertiary gas spring, with gas spring assembly inner chamber and gas pitcher intercommunication, can balanced atmospheric pressure, and the atress of each structure of flexible gas spring assembly when different compression state avoids gas spring assembly inside atmospheric pressure under being in various compression state too big.

4. The utility model discloses a lead screw elevating system adopts the worm gear as drive assembly, has certain auto-lock ability, and lead screw mechanism itself just has very strong auto-lock ability simultaneously, consequently lead screw elevating system can rise to when packing up the state to the group battery, provides very big auto-lock power, guarantees that the group battery can not be because of complicated situation dislocation removal such as jolting when the car goes.

Drawings

Fig. 1 is an isometric view of the present invention;

FIG. 2 is a front sectional view of the present invention;

FIG. 3 is a left side sectional view of the present invention;

FIG. 4 is a cross-sectional view of a gas spring assembly in accordance with the present invention;

fig. 5 is a sectional view of the screw mechanism after the completion of the lifting of the present invention;

fig. 6 is a sectional view of the screw mechanism when the utility model ascends to the completion of the first stage;

fig. 7 is a sectional view of the screw mechanism before the lifting of the present invention;

FIG. 8 is a schematic view of the relative position of the carriage body after the carriage is lifted;

FIG. 9 is a schematic view of the relative position of the carriage body and the carriage body as it ascends to the completion of the first stage;

FIG. 10 is a schematic view of the relative positions of the vehicle body and the vehicle body before ascending;

fig. 11 is a partial cross-sectional view of the present invention in a vehicle;

the parts in the drawings are numbered as follows: 1. a chassis; 2. a battery pack; 3. a support plate; 4. a lead screw assembly; 5. A motor assembly; 6. a wheel; 7. a housing; 8. a motor; 9. a motor connector; 10. a third-stage screw rod; 11. A secondary lead screw; 12. a sleeve; 13. a worm; 14. a worm gear; 15. a first piston; 16. a rubber ring I; 17. A gas compression chamber; 18. a second-stage gas spring; 181. a first vent hole; 19. a three-level gas spring; 191. a second vent hole; 20. a rubber ring; 21. a second piston; 22. a second rubber ring; 23. a bottom cover; 24. a gas tank; 25. a cylinder conduit.

Detailed Description

The following detailed description of the preferred embodiments of the present invention will be provided in conjunction with the accompanying drawings, so as to enable those skilled in the art to more easily understand the advantages and features of the present invention, and thereby define the scope of the invention more clearly and clearly. It is obvious that the described embodiments are only some of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

Examples

Referring to fig. 1 to 3, a lead screw lifting mechanism of the present invention includes a motor 8, a housing 7, a motor connector 9, a gas spring assembly, a lead screw assembly 4 and a transmission assembly; the lead screw assembly 4 is formed by connecting a primary lead screw, a secondary lead screw 11 and a tertiary lead screw 10 in a threaded manner, the external thread of the tertiary lead screw 10 is matched with the internal thread of the secondary lead screw 11, the external thread of the secondary lead screw 11 is matched with the internal thread of the primary lead screw, the upper end of the tertiary lead screw 10 of the lead screw assembly 4 is fixed at the lower part of the carriage chassis 1, the tertiary lead screw 10 is ensured not to move, the primary lead screw of the lead screw assembly 4 is connected with a transmission assembly, the transmission assembly drives the primary lead screw to rotate, the primary lead screw drives the secondary lead screw 11 to move under the action of the thread in the rotating process, the transmission assembly is driven by a motor 8, and the transmission assembly and the motor 8 are fixed through a motor connector 9; the gas spring assembly is fixed inside the lead screw assembly 4 to assist the lead screw assembly 4 to perform lifting movement.

As shown in fig. 2 to 3, the transmission assembly is composed of a driving shaft and a driven shaft, the driving shaft is a worm 13, the spiral teeth of the worm 13 are arranged at the middle position of the driving shaft, the worm 13 is fixed inside the shell 7, and one end of the worm 13 is connected with the motor 8 in a key mode; the driven shaft is by sleeve 12 with be located the worm wheel 14 in the sleeve outside is constituteed, just the structural component of the fixed shaping formula as an organic whole of sleeve 12 and worm wheel 14, worm 13 and the meshing of worm wheel 14 drive worm 13 by motor 8 driving shaft and rotate, worm 13 drives worm wheel 14 rather than the meshing thereupon and rotates, because worm wheel 14 and sleeve 12 formula structure as an organic whole are fixed, sleeve 12 is synchronous rotation under the effect of worm wheel 14.

The sleeve 12 is a primary screw rod, and the internal thread of the sleeve 12 is matched with the external thread of the secondary screw rod 11 to realize the relative movement of the sleeve 12 and the secondary screw rod 11.

As shown in fig. 4 to 8, the gas spring assembly is located inside the lead screw assembly 4, and the gas spring assembly is composed of a first-stage gas spring, a second-stage gas spring 18, and a third-stage gas spring 19, the first-stage gas spring being an innermost lead screw; the second-stage gas spring 18 is of a hollow shaft shell structure, a first piston 15 is fixed at the upper end of the second-stage gas spring, a circumferential groove hole is formed in the middle of the first piston 15, a first rubber ring 16 is fixed on the groove hole, the first piston 15 is matched with the first-stage gas spring, and a circular hole in the bottom end of the first-stage gas spring is in closed fit with the second-stage gas spring 18 penetrating through the circular hole; the three-level gas spring 19 is located inside the second-level gas spring 18, a second piston 21 is fixed at the upper end of the three-level gas spring 19, a circumferential groove hole is formed in the middle of the second piston 21, a second rubber ring 22 is fixed on the groove hole, the second piston 21 is matched with the second-level gas spring 18, a circular hole in the bottom end of the second-level gas spring 18 is hermetically matched with the third-level gas spring 19 penetrating through the circular hole, and the lower end of the third-level gas spring 19 is in threaded connection with the center of the driven shaft bottom plate.

Wherein the second-stage gas spring 18 and the inner space of the first-stage gas spring form a gas compression chamber 17, and the third-stage gas spring 19 and the inner space of the second-stage gas spring 18 form a gas compression chamber 17. The gas in the gas compression chamber 17 is compressed or released when the various stages of the gas spring move, and corresponding tension is generated.

The first piston 15 arranged at the top end of the second-stage gas spring 18 and the second piston 21 arranged at the top end of the third-stage gas spring 19 can facilitate the vertical movement of each stage of gas spring member, so that the friction resistance is reduced, the first rubber ring 16 and the second rubber ring 22 are fixed at the circumferential groove holes of the corresponding gas spring pistons, so that the sealing effect is realized, and the sealing performance of the gas compression chamber 17 is ensured.

As shown in fig. 1 to 4, the driving shaft of the transmission assembly is transversely fixed in the housing 7, the driven shaft vertically penetrates through the housing 7, a bottom plate is arranged below the driven shaft, after the driven shaft penetrates through the lower portion of the housing 7, a bottom cover 23 is fixed below the housing 7 in a pin fit mode, the bottom plate is fixed on the bottom cover 23, a rubber ring 20 is fixed at the joint of the upper end of the driven shaft and the upper end of the housing 7, friction force generated when the driven shaft rotates is reduced, and stability of rotation of the driven shaft is guaranteed.

In this embodiment, the gas spring assembly is connected with a gas tank 24, a first slot is formed in the side surface of the shell 7, a second slot is formed in the bottom end of the bottom cover 23, the gas tank 24 is connected with a gas tank guide pipe 25 at the opening of the gas tank, and the other end of the gas tank guide pipe 25 sequentially penetrates through the first slot, the second slot and the bottom end opening of the tertiary gas spring 19 to be hermetically connected.

Wherein, the second-stage gas spring 18 is provided with a first vent hole 181 at a position close to the lower part of the first piston 15, and the third-stage gas spring 19 is provided with a second vent hole 191 at a position close to the lower part of the second piston 21, so that the inner cavity of the gas spring assembly is communicated with the gas tank 24, the gas pressure can be balanced, and the stress of each structure of the gas spring assembly in different compression states can be softened.

In this embodiment, the motor 8 with the drive assembly is connected with the motor connector 9, the motor connector 9 is a flange-shaped structure, so that the two are fixed, the motor shaft of the motor 8 is connected with the drive shaft of the drive assembly through a key, and the other side of the motor connector 9 is fixed on the shell 7.

Wherein, the driving shaft worm 13 both ends are fixed with antifriction bearing, the antifriction bearing is right worm 13 has the supporting role, reduces the friction loss among the transmission process as far as possible simultaneously, the antifriction bearing outside all is equipped with the oil blanket, guarantees its leakproofness, prevents the lubricating oil seepage.

In this embodiment, the upper end of the screw lifting mechanism is fixed on the lower side of the vehicle chassis 1, the lower end of the screw lifting mechanism is fixed on the battery pack supporting plate 3, and the screw lifting mechanism is respectively located at four corners of the battery pack supporting plate 3.

In this way, the utility model provides a pair of lead screw elevating system can divide into two stages with the ascending process of whole lead screw elevating system:

and in the first stage, when the four motors rotate simultaneously, the motor shaft drives the driving shaft to rotate, the driving shaft drives the driven shaft meshed with the driving shaft to rotate, the driven shaft is in threaded connection with the secondary screw rod, when the driven shaft rotates, the inner threads of the driven shaft rotate, and the inner threads and the outer threads of the secondary screw rod are matched to provide lifting force for the screw rod lifting mechanism. When the screw lifting mechanism rises, the bottom of the secondary screw gradually approaches the bottom plate of the driven shaft until the two are contacted, and the driven shaft and the secondary screw do not generate relative displacement and relative rotation.

And step two, after the step one is finished, the motor still continues to rotate, the driven shaft and the secondary lead screw continue to rotate according to the step one, the internal thread of the secondary lead screw can be matched with the external thread of the tertiary lead screw to continue to provide lifting force for the whole lead screw lifting mechanism, when the lead screw lifting mechanism is lifted to a preset position, the motor stops running at the same time, and the whole lifting process is finished. Because the lead screw lifting mechanism is fixed on the battery pack supporting plate, the lead screw lifting mechanism can drive the supporting plate to ascend when ascending, and the ascending process of the battery pack is realized.

When the battery pack needs to be replaced, the motor runs in a reverse rotation mode, the lead screw lifting mechanism can be driven to descend, and the descending process of the battery pack is achieved.

The battery pack lifting mechanism comprises a lead screw lifting mechanism, a lead screw lifting mechanism and a gas spring assembly, wherein the lead screw lifting mechanism is internally provided with the gas spring assembly, the innermost lead screw is taken as a primary gas spring structure, the gas spring assembly provides upward tension for the whole structure, partial gravity influence is counteracted through the tension of the gas spring when the battery pack descends, and the battery pack is prevented from descending too fast; the battery pack provides upward pulling force when rising, reduces pulling force provided by the motor required when rising, and reduces power required by the motor.

The above description is only intended to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; all the equivalent structures or equivalent flow changes made by the contents of the specification and the drawings of the utility model, or the direct or indirect application in other related technical fields, are included in the patent protection scope of the utility model.

Claims (10)

1. A lead screw lifting mechanism is characterized by comprising a motor (8), a shell (7), a motor connector (9), a gas spring assembly, a lead screw assembly (4) and a transmission assembly; the lead screw component (4) is composed of a first-level lead screw, a second-level lead screw (11) and a third-level lead screw (10), the external thread of the third-level lead screw (10) is matched with the internal thread of the second-level lead screw (11), the upper end of the third-level lead screw (10) is fixed, and the external thread of the second-level lead screw (11) is matched with the internal thread of the first-level lead screw.

2. A screw lifting mechanism according to claim 1, wherein the transmission assembly is composed of a driving shaft and a driven shaft, the driving shaft is a worm (13), and the worm (13) is in key connection with a motor shaft; the driven shaft is composed of a sleeve (12) and a worm wheel (14) located on the outer side of the sleeve (12), the sleeve (12) and the worm wheel (14) are fixedly molded into an integrated structural component, and the worm (13) is meshed with the worm wheel (14).

3. A screw lifting mechanism according to claim 2, wherein the sleeve (12) is a primary screw, and the internal thread of the sleeve (12) is matched with the external thread of the secondary screw (11).

4. A lead screw lifting mechanism according to claim 2, characterised in that the gas spring assembly is located inside the lead screw assembly (4), the gas spring assembly being composed of a primary gas spring, a secondary gas spring (18) and a tertiary gas spring (19), the primary gas spring being the innermost lead screw; the second-stage gas spring (18) is of a hollow shaft shell structure, a first piston (15) is fixed at the upper end of the second-stage gas spring, a circumferential groove hole is formed in the middle of the first piston (15), a first rubber ring (16) is fixed on the groove hole, the first piston (15) is matched with the first-stage gas spring, and a circular hole in the bottom end of the first-stage gas spring is in sealed fit with the second-stage gas spring (18) penetrating through the circular hole; tertiary air spring (19) is located inside second grade air spring (18), tertiary air spring (19) is hollow tubular structure, just tertiary air spring (19) upper end is fixed with piston two (21), the hoop slotted hole has been opened to piston two (21) intermediate position, be fixed with rubber ring two (22) on the slotted hole, piston two (21) with second grade air spring (18) cooperation, the circular trompil in second grade air spring (18) bottom and passing from it tertiary air spring (19) airtight cooperation, tertiary air spring (19) lower extreme with the bottom plate central point of driven shaft puts department threaded connection.

5. A screw lifting mechanism as claimed in claim 4, wherein the driving shaft is fixed transversely in the housing (7), the driven shaft vertically passes through the housing (7), the bottom end of the driven shaft is fixed on a bottom cover (23), the bottom cover (23) is fixed at the lower end of the housing (7) in a matching manner, and a rubber ring (20) is fixed at the matching position of the driven shaft and the upper end of the housing (7).

6. A lead screw lifting mechanism according to claim 5, characterized in that the gas spring assembly is connected with a gas tank (24), the side surface of the housing (7) is provided with a first slotted hole, the bottom end of the bottom cover (23) is provided with a second slotted hole, the gas tank (24) is connected with a gas tank guide pipe (25) at the gas tank opening, and the other end of the gas tank guide pipe (25) penetrates through the first slotted hole, the second slotted hole and the bottom end opening of the three-stage gas spring (19) in sequence to be hermetically connected.

7. A lead screw lifting mechanism according to claim 4, characterised in that the secondary gas spring (18) is provided with a first vent hole (181) at a position close to the lower part of the first piston (15), and the tertiary gas spring (19) is provided with a second vent hole (191) at a position close to the lower part of the second piston (21).

8. A screw lifting mechanism according to any one of claims 2 to 7, characterised in that the motor (8) and the transmission assembly are connected by a motor connector (9), the other side of the motor connector (9) being fixed to the housing (7).

9. A screw lifting mechanism according to any one of claims 2 to 7, wherein bearings are fixed at both ends of the worm (13), and oil seals are arranged outside the bearings.

10. A screw lifting mechanism according to claim 1, wherein the upper end of the screw lifting mechanism is fixed on the lower side of the vehicle body chassis (1), the lower end of the screw lifting mechanism is fixed on the battery pack supporting plate (3), and the screw lifting mechanism is respectively positioned at four corners of the battery pack supporting plate (3).

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