Foldable electric supporting leg

Abstract

The utility model discloses a foldable electric supporting leg. The electric supporting leg comprises a lower shell, an upper shell connected to the upper end of the lower shell and an installation support hinged to the upper shell. The lower shell is connected with a supporting leg mechanism and a motor mechanism; the supporting leg mechanism comprises an outer cylinder connected with the lower shell, a supporting pipe connected into an inner cavity of the outer cylinder in a sleeved mode, a grounding supporting plate connected to the lower end of the supporting pipe, a pushing assembly driving the supporting pipe to move up and down and a linkage lever assembly. The linkage lever assembly comprises a limiting pipe connected to the outer wall of the outer cylinder in a sleeving mode, a telescopic pipe connected to the outer wall of the limiting pipe in a sleeving mode, a spring connected to the outer wall of the outer cylinder in a sleeving mode and located between the lower shell and the limiting pipe, and two linkage levers symmetrically distributed on the two sides of the outer cylinder. The lower end of the telescopic pipe is fixed with the grounding support plate; the upper end of the telescopic pipe is connected with the outer wall of the limiting pipe; the upper and lower ends of the linkage lever are respectively connected with the mounting bracket and the limiting pipe; along with the movement of the grounding support plate, the folding and unfolding of the support legs can be realized through the linkage lever assembly.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of automobile parts, in particular to a foldable electric supporting leg. BACKGROUND

[0002] For part vehicle models (such as motor homes, advertising vehicles, etc.), when parking, a parking support device is usually used to support the weight of the chassis. That is, when parking, the supporting leg installed on the vehicle chassis is lowered to support the ground, so as to better support the chassis.

[0003] The existing supporting leg generally comprises an outer cylinder, a supporting pipe and a pushing assembly for driving the supporting pipe to extend outside the outer cylinder or retract into the outer cylinder; the supporting pipe is inserted into the outer cylinder with a gap, and the lower end of the supporting pipe is connected with a ground supporting plate located outside the lower end of the outer cylinder for contacting the ground.

[0004] When not in use, the supporting leg is folded and stored to avoid affecting the normal operation of the vehicle; when in use, the supporting leg is lowered to be perpendicular to the base, and the ground supporting plate is driven to move downward until it abuts against the ground. The existing supporting leg is generally installed and fixed with the base through a mounting bracket, and the mounting bracket and the outer cylinder are connected through a hinged manner. When folding the supporting leg, the outer cylinder body is manually held and rotated to change the outer cylinder from a perpendicular state to a parallel state with the base, thereby achieving the purpose of folding the supporting leg. Correspondingly, when the supporting leg is in use, the outer cylinder body is manually held and forced in the opposite direction to change the outer cylinder from a parallel state to a perpendicular state with the base. When the outer cylinder is perpendicular to the base, the supporting leg is in an unfolded and lowered state; when the outer cylinder is parallel to the base, the supporting leg is in a folded and stored state.

[0005] The folding and unfolding of the above-mentioned supporting leg requires manual operation of holding the outer cylinder body, which is time-consuming and labor-intensive, and the overall operation experience is not good. UTILITY MODEL CONTENTS

[0006] The utility model aims at providing a foldable electric supporting leg, solving the technical problem of manual operation of folding and unfolding the supporting leg in the prior art. The utility model has simple structure and lower cost.

[0007] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0008] A foldable electric supporting leg comprises a supporting leg body and a mounting bracket; the supporting leg body comprises a lower shell, an upper shell connected to the upper end of the lower shell, a supporting leg mechanism and a motor mechanism; the mounting bracket is hinged to the upper shell; the supporting leg mechanism and the motor mechanism are connected to the lower shell.

[0009] The support leg mechanism comprises an outer cylinder connected with the lower shell, a support tube sleeved in the inner cavity of the outer cylinder, a grounding support plate connected with the lower end of the support tube, a pushing assembly for driving the support tube to move up and down, and a linkage lever assembly; the grounding support plate is located below the lower end of the outer cylinder;

[0010] The linkage lever assembly comprises a limiting tube sleeved on the outer wall of the outer cylinder, an extension tube sleeved on the outer wall of the limiting tube, a spring sleeved on the outer wall of the outer cylinder, and two linkage levers symmetrically distributed on both sides of the outer cylinder;

[0011] The lower end of the extension tube is fixed with the grounding support plate, and the upper end of the extension tube is connected with the outer wall of the limiting tube; the spring is located between the lower shell and the limiting tube; the upper end of the linkage lever is hinged with the mounting bracket, and the lower end of the linkage lever is connected with the wall of the limiting tube;

[0012] The motor mechanism drives the pushing assembly to operate, and the pushing assembly drives the support tube to move up and down.

[0013] Further, the pushing assembly comprises a primary screw rod, a primary nut threadedly connected with the outer wall of the primary screw rod, a hollow secondary screw rod located below the primary nut, a secondary nut threadedly connected with the outer wall of the secondary screw rod, and a guide tube fixedly connected with the outer wall of the primary nut;

[0014] The primary nut and the guide tube are located in the inner cavity of the outer cylinder; the secondary nut is located in the inner cavity of the guide tube, and the upper part of the support tube is fixedly connected with the outer wall of the secondary nut;

[0015] The primary screw rod is inserted into the inner cavity of the secondary screw rod, and the inner wall of the secondary screw rod is connected with the primary screw rod through a key and a key groove, the key is located in the key groove and can move axially along the key groove;

[0016] The upper end of the secondary screw rod is provided with a transversely protruding stepped portion in the radial direction, and the inner wall of the guide tube is provided with a limiting end in the radial direction; the stepped portion is located between the upper end of the limiting end and the lower end of the primary nut;

[0017] The motor mechanism comprises a motor and a gear one connected with the motor shaft of the motor; the outer wall of the primary screw rod is fixed with a gear three; the gear one drives the gear three to rotate after rotating.

[0018] Further, the electric support leg further comprises a micro switch; the micro switch is installed at the lower end of the lower shell and located above the primary nut; when the primary nut contacts the micro switch, the motor stops running.

[0019] Further, a transversely extending stop rod is arranged on the inner wall of the mounting bracket; after the stop rod abuts against the upper end surface of the upper shell, the support leg body can be prevented from continuing to rotate.

[0020] Further, the gear one and the gear three are further connected with the gear two; the gear two is engaged with the gear one and the gear three; the gear one, the gear two and the gear three are located between the lower shell and the upper shell.

[0021] Further, the motor is further connected with a Hall plate, and the motor shaft of the motor is further connected with an electromagnetic ring.

[0022] Further, the thrust bearing, the ball bearing and the plane bearing are sleeved on the primary screw rod; and the plane bearing is located between the lower end of the primary nut and the upper end of the secondary screw rod.

[0023] Further, the large bevel gear is further connected with the motor shaft of the motor.

[0024] The large bevel gear is located between the lower shell and the upper shell.

[0025] The upper shell is further connected with the small bevel gear engaged with the large bevel gear; the rear end of the small bevel gear is connected with the manual emergency rotating shaft; the outer end of the manual emergency rotating shaft is extended to the outside of the upper shell.

[0026] Further, the motor is further connected with the motor housing; the motor is arranged in the motor housing; and the motor housing is connected with the lower shell.

[0027] Compared with the prior art, the foldable electric supporting leg has the following advantages

[0028] Beneficial effects:

[0029] In the utility model, the linkage lever assembly is additionally arranged between the grounding support plate and the mounting support, the linkage lever assembly comprises a limiting pipe sleeved on the outer wall of the outer cylinder, an extension pipe sleeved on the outer wall of the limiting pipe, a spring sleeved on the outer wall of the outer cylinder and two linkage levers symmetrically arranged on the two sides of the outer cylinder, the lower end of the extension pipe is fixed with the grounding support plate, the upper end of the extension pipe is connected with the outer wall of the limiting pipe, the spring is located between the lower shell and the limiting pipe, the upper end of the linkage lever is hinged with the mounting support, and the lower end of the linkage lever is connected with the wall of the limiting pipe.

[0030] The grounding support plate is fixedly connected with the lower end of the supporting pipe and located below the lower end port of the outer cylinder, when the supporting pipe moves up and down, the grounding support plate is synchronously moved up and down, the movement of the grounding support plate changes the included angle between the linkage lever and the mounting support, thereby realizing the folding and laying down operation of the supporting leg body.

[0031] Through the linkage lever assembly, we can push the supporting legs to complete the change between the unfolded state and the folded state by means of the movement of the grounding support plate itself. Without manually exerting force on the outer cylinder to fold and unfold the supporting legs, time and effort are saved. At the same time, the power source of the electric supporting leg is a motor, which can not only realize the stretching movement of the grounding support plate to the outside of the outer cylinder and the retracting movement to the inner cavity of the outer cylinder, but also realize the folding and unfolding of the supporting leg as a whole. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is a side view of the electric supporting leg in the utility model (unfolded state).

[0033] Figure 2 is a side view of the electric supporting leg in the utility model (folded state).

[0034] Figure 3 is a side view of the electric supporting leg in the utility model (folded state).

[0035] Figure 4 is a perspective view of the electric supporting leg in the utility model (unfolded state). Figure 1 (not including the motor shell).

[0036] Figure 5 is a perspective view of the electric supporting leg in the utility model (unfolded state). Figure 2 (excluding the upper shell and mounting bracket and other parts of the structure).

[0037] Figure 6 is a top view of the electric supporting leg in the utility model (excluding the upper shell and mounting bracket and other parts of the structure).

[0038] Figure 7 is a left view structural schematic diagram of the electric supporting leg in the utility model (unfolded state).

[0039] Figure 8 is a right view structural schematic diagram of the electric supporting leg in the utility model (unfolded state).

[0040] Figure 9 is a connection structure schematic diagram of the supporting pipe and the grounding support plate in the utility model.

[0041] Figure 10 is a sectional view of the two-stage screw rod.

[0042] In the drawings:

[0043] 1-upper shell, 2-thrust bearing, 3-gear three, 4-gear two, 5-large bevel gear, 6-gear one, 7-gasket one, 8-motor, 9-first stage nut, 10-motor housing, 11-spring, 12-first stage screw rod, 13-limiting tube, 14-motor shaft, 15-self-tapping screw one, 16-electromagnetic ring, 17-Hall plate, 18-ground support plate, 181-telescopic tube connecting end, 19-telescopic tube, 20-key, 21-hoop, 22-support tube, 23-guide tube, 231-limiting end, 24-outer tube, 25-second stage nut, 26-second stage screw rod, 261-step portion, 262-key groove, 27-flat bearing, 28-micro switch, 29-internal hexagonal screw, 30-gasket two, 31-lower shell, 32-ball bearing, 33-manual emergency rotating shaft, 34-small bevel gear, 35-mounting bracket, 36-stop rod, 37-rotating shaft sleeve, 38-internal hexagonal screw, 39-rotating shaft, 40-screw one, 41-linkage lever, 42-screw two, 45-self-tapping screw two, 46-Hall plate bracket. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0045] As shown in Figures 1-10 The utility model provides a kind of foldable electric support leg, and the electric support leg includes support leg main body and mounting bracket 35;Support leg main body includes lower shell 31, be connected to the upper shell 1 of lower shell 31 upper end, support leg mechanism and motor mechanism;Mounting bracket 35 is hinged with upper shell 1;The support leg mechanism and motor mechanism are connected with lower shell 31.

[0046] When using, the upper end of mounting bracket 35 is fixed to the lower end of the vehicle chassis.

[0047] As shown in Figure 1 In the embodiment, support leg mechanism includes outer tube 24 connected with lower shell 31, support tube 22 sleeved in the inner cavity of outer tube 24, ground support plate 18 connected to the lower end of support tube 22, push assembly driving support tube 22 to move up and down and linkage lever assembly located on the outer side of outer tube 24;Ground support plate 18 is located below the lower end port of outer tube 24, as shown in Figure 1 .

[0048] As shown in Figures 1-3 And Figures 7-8As shown, the linkage lever assembly includes a limiting tube 13 sleeved on the outer wall of the outer cylinder 24, a telescopic tube 19 sleeved on the outer wall of the limiting tube 13, a spring 11 sleeved on the outer wall of the outer cylinder 24, and two linkage levers 41 symmetrically distributed on both sides of the outer cylinder 24. In this embodiment, the telescopic tube 19 is a rubber telescopic tube.

[0049] like Figure 9 The diagram shows the connection structure between the support pipe 22 and the grounding support plate 18. In this embodiment, the grounding support plate 18 is fixedly connected to the lower end of the support pipe 22, and is located below the lower port of the outer cylinder 24. When the support pipe 22 moves up and down axially, it will drive the grounding support plate 18 to move up and down synchronously. Meanwhile, as shown... Figure 9 As shown, a ring-shaped protrusion is radially arranged on the outer ring of the upper support tube 22 of the grounding support plate 18, which is the telescopic tube connection end 181.

[0050] like Figure 1 As shown, the lower end of the telescopic tube 19 is fixedly connected to the telescopic tube connection end 181, thereby fixing the lower end of the telescopic tube 19 to the grounding support plate 18. Meanwhile, as... Figure 1 As shown, the upper end of the telescopic tube 19 is fastened to the outer wall of the limiting tube 13 by the clamp 21.

[0051] Spring 11 is located between the lower housing 31 and the limiting tube 13. Specifically, as shown... Figure 1 As shown, gasket 2 30 is welded to the outer wall of the upper port of the outer cylinder 24. Gasket 2 30 is fixedly connected to the lower housing 31 by hexagon socket screw 29. Gasket 1 7 is provided radially on the outer ring of the outer cylinder 24 at the lower end of the hexagon socket screw 29. The upper end of the spring 11 abuts against gasket 1 7, and the lower end of the spring 11 abuts against the upper end of the limiting tube 13.

[0052] exist Figure 1 , 4 In the middle, the electric support leg is in the unfolded and lowered state; after being assembled with the vehicle chassis, in the unfolded and lowered state, both the outer cylinder 24 and the support tube 22 are perpendicular to the ground.

[0053] like Figure 1 As shown, the lower end of the limiting tube 13 abuts against the upper end of the grounding support plate 18. If the grounding support plate 18 continues to move upwards, i.e., the support tube 22 continues to retract into the outer cylinder 24, it will cause the limiting tube 13 to push along the outer cylinder 24 towards the mounting bracket 35. The spring 11 will continue to contract under pressure. Since the upper end of the linkage lever 41 is hinged to the mounting bracket 35 (in a movable connection state), the angle between the linkage lever 41 and the mounting bracket 35 changes under the push of the limiting tube 13, and the support leg will... Figure 1 The unfolded and unfolded state shown gradually changes to the state shown. Figure 2 , 3The folding and stowing state is shown. In Figure 2 In the fully folded and stowed state shown, the outer cylinder 24 and the support tube 22 are in a parallel state with the ground, and the primary nut 9 is in contact with the micro switch 28.

[0054] In Figure 1 , the support leg is in the unfolded and deployed state, but at this time, the extension length of the support leg has not reached the maximum value. In Figure 1 , if the grounding support plate 18 continues to move downward, that is, the support tube 22 continues to move outward and extend to the outside of the outer cylinder 24, the grounding support plate 18 will continue to move downward and gradually approach the ground until it abuts against the ground.

[0055] Correspondingly, when the support leg is in the folding and stowing state as shown in Figure 2 , if the support tube 22 continues to extend outward to the outside of the outer cylinder 24, it will drive the grounding support plate 18 to move away from the outer cylinder 24, the telescopic tube 19 and the spring 11 will extend, and the extended spring 11 will push the limiting tube 13 to move along the outer cylinder 24 tube body towards the grounding support plate 18, the linkage lever 41 will be pulled by the limiting tube 13, the included angle between the linkage lever 41 and the mounting bracket 35 will change, and the support leg will gradually recover from the folding and stowing state shown in Figure 2 to the unfolded and deployed state shown in Figure 1 .

[0056] Through the linkage lever assembly, we can push the support leg to realize the conversion between the unfolded and deployed state and the folding and stowed state by means of the movement of the grounding support plate 18 itself. Without manually applying force to the outer cylinder 24 tube body to fold and stow or unfold and deploy the support leg, time and effort are saved. At the same time, the power source of the electric support leg is the motor 8, which can not only realize the extension and retraction movement of the grounding support plate 18, but also realize the folding and stowing and unfolding and deploying operation of the support leg body.

[0057] The mounting bracket 35 is hinged to the upper housing 1; the upper end of the linkage lever 41 is hinged to the mounting bracket 35, and the lower end of the linkage lever 41 is connected to the tube wall of the limiting tube 13. Specifically, as shown in Figure 7 , the rotating shaft sleeve 37 is installed in the upper housing 1, the rotating shaft 39 is inserted into the rotating shaft sleeve 37, one end of the rotating shaft 39 is integrally connected with a connecting end, and the connecting end is connected with the mounting bracket 35 through the inner hexagonal screw 38; the upper end of the linkage lever 41 is movably connected with the mounting bracket 35 through the screw one 40, and the lower end of the linkage lever 41 is connected with the limiting tube 13 through the screw two 42. Specifically, in this embodiment, two symmetrical rotating shafts 39 are included, as shown in Figure 7 .

[0058] The motor mechanism is used for driving the pushing assembly to move up and down.

[0059] Specifically, the motor mechanism comprises a motor 8 and a gear three 3 connected with a motor shaft of the motor 8. The pushing assembly is a two-stage screw rod structure, which comprises a first-stage screw rod 12 and a second-stage screw rod 26. Figure 1 As shown in the figure, the upper end of the lower shell 31 is radially connected with the gear three 3, the gear three 3 is connected with the gear two 4, and the gear two 4 is engaged with the gear three 3 and the gear one 6. After the motor 8 is started, the gear one 6 is driven to rotate, and then the gear two 4 is driven to rotate, the gear three 3 is driven to rotate, and finally the first-stage screw rod 12 is driven to rotate radially.

[0060] Specifically, as shown in the figure, Figure 1 The pushing assembly in the embodiment comprises the first-stage screw rod 12, a first-stage screw nut 9 threadedly connected with the outer wall of the first-stage screw rod 12, a hollow second-stage screw rod 26 located below the first-stage screw nut 9, a second-stage screw nut 25 threadedly connected with the outer wall of the second-stage screw rod 26, and a guide pipe 23 fixedly connected with the outer wall of the first-stage screw nut 9.

[0061] Specifically, as shown in the figure, Figure 1 The first-stage screw nut 9 and the guide pipe 23 are located in the inner cavity of the outer cylinder 24, the second-stage screw nut 25 is located in the inner cavity of the guide pipe 23, and the upper part of the support pipe 22 is fixedly connected with the outer wall of the second-stage screw nut 25.

[0062] As shown in the figure, Figure 1 The first-stage screw rod 12 is inserted into the inner cavity of the second-stage screw rod 26, and the inner wall of the second-stage screw rod 26 is connected with the first-stage screw rod 12 through a key and a key groove. The key is located in the key groove and can move axially along the key groove. Specifically, in the embodiment, the key 20 is arranged on the lower outer wall of the first-stage screw rod 12 radially, and the key groove 262 matched with the key 20 is arranged on the inner wall of the second-stage screw rod 26. As shown in the figure, Figure 10 In the embodiment, the key groove 262 is a straight recess as a whole, which extends axially along the second-stage screw rod 26 from the upper end of the second-stage screw rod 26 downward, and the length of the key groove 262 is much greater than the length of the key 20. When installed, the key 20 can be inserted into the key groove 262 from the upper end of the second-stage screw rod 26, and when the second-stage screw rod 26 moves up and down, the key 20 moves relatively in the up and down direction with the key groove 262.

[0063] The upper end of the second-stage screw rod 26 is radially provided with a transversely protruding stepped portion 261, and the inner wall of the guide pipe 23 is radially provided with a limiting end 231. The stepped portion 261 is located between the upper end of the limiting end 231 and the lower end of the first-stage screw nut 9. As shown in the figure, Figure 1As shown, by the above structure, the stepped portion 261 is locked between the primary nut 9 and the limiting end 231, so that when the primary nut 9 moves up and down along the guide tube 23, the secondary screw rod 26 can be driven to move up and down synchronously. When the secondary screw rod 26 moves up and down, the key 20 and the key groove 262 move relative to each other in the up-down direction.

[0064] In addition, since the inner wall of the secondary screw rod 26 and the outer wall of the primary screw rod 12 are connected by the key, when the primary screw rod 12 rotates radially, the secondary screw rod 26 can be driven to rotate radially synchronously. After the secondary screw rod 26 rotates radially, the secondary nut 25 can be driven to move axially. Since the upper part of the support tube 22 is fixedly connected to the outer wall of the secondary nut 25, the support tube 22 can also be driven to move up and down synchronously. When the support tube 22 moves up, i.e., the support tube 22 is retracted into the inner cavity of the outer cylinder 24, the overall length of the support leg becomes shorter. When the support tube 22 moves down, i.e., the support tube 22 extends out of the inner cavity of the outer cylinder 24, the overall length of the support leg becomes longer, and the grounding support plate 18 can gradually approach the ground until it is in contact with the ground.

[0065] In this embodiment, after the motor 8 is started, the pushing assembly of the secondary screw rod structure can drive the support tube 22 and the grounding support plate 18 to move up and down along the axis of the outer cylinder 24.

[0066] In this embodiment, when the primary screw rod 12 rotates, not only the secondary nut 25 can drive the support tube 22 to move axially along the secondary screw rod 26, but also the entire combination of the guide tube 23, the secondary screw rod 26, the secondary nut 25, the support tube 22, and the grounding support plate 18 can move axially in the same direction under the drive of the primary nut 9, thereby accelerating the movement speed of the grounding support plate 18 and the support tube 22 relative to the outer cylinder 24.

[0067] That is, the movement speed of the grounding support plate 18 and the support tube 22 relative to the outer cylinder 24 is not only affected by the movement speed of the secondary nut 25 moving along the outer wall of the secondary screw rod 26, but also affected by the movement speed of the primary nut 9 moving along the outer wall of the primary screw rod 12.

[0068] Compared with the single-screw rod structure (i.e., a structure including only a single screw rod, a single nut connected to the outer wall of the screw rod by threads, and a support tube connected to the nut), the pushing assembly of the secondary screw rod structure in this embodiment can achieve faster movement of the support tube 22.

[0069] Preferably, the electric support leg in this embodiment further includes a micro switch 28. The micro switch 28 is installed at the lower end of the lower shell 31 and located above the primary nut 9, as shown in FIG. 1. Figure 1As shown; when the primary nut 9 contacts the micro switch 28, the motor 8 can be controlled to stop running, at this time, the primary lead screw 12 stops rotating, and the support leg is in the folded state.

[0070] Preferably, as shown in Figure 7 、 8 , the inner wall of the mounting bracket 35 is also provided with a transversely extending stop rod 36, and two stop rods 36 are symmetrically distributed. In this embodiment, the stop rod 36 is a transverse protruding part, which is located above the upper shell 1 and above the screw 40, as shown in Figure 1 、 2 , 7.

[0071] In the process of changing the support leg from the folded state shown in Figure 2 to the unfolded state shown in Figure 1 , the mounting bracket 35 and the rotating shaft 39 are stationary, and the upper shell 1 rotates; when the support leg is in the unfolded state shown in Figure 1 , the stop rod 36 abuts against the upper end surface of the upper shell 1, which can prevent the support leg body from continuing to rotate to the right and unfold, and the outer cylinder 24 and the support tube 22 can be kept perpendicular to the ground. Then, the primary lead screw 12 continues to rotate, and only the support tube 22 and the ground support plate 18 will move vertically downward until the ground support plate 18 contacts the ground, abuts against the ground and supports the chassis.

[0072] Preferably, the motor 8 is also connected with a Hall plate 17, and the motor shaft of the motor 8 is also connected with an electromagnetic ring 16. Specifically, the electric support leg further comprises a Hall plate 17, a self-tapping screw 15, a self-tapping screw 45, a Hall plate bracket 46, and an electromagnetic ring 16. The Hall plate 17 is provided with a sensor, which can determine the position of the electric support leg. The Hall plate bracket 46 is connected with the Hall plate 17 through the self-tapping screw 15, and the Hall plate bracket 46 is connected to the motor 8 through the self-tapping screw 45, as shown in Figure 1 and Figure 6 .

[0073] Preferably, it also includes a thrust bearing 2, a ball bearing 32, and a plane bearing 27, as shown in Figure 1 , the thrust bearing 2, the ball bearing 32, and the plane bearing 27 are sleeved on the outer wall of the primary lead screw 12.

[0074] Preferably, the upper part of the gear 6 is also provided with a large bevel gear 5; the large bevel gear 5 is fixedly connected with the motor shaft of the motor 8, as shown in Figure 1 、 2 , 4.

[0075] At the same time, the gear 6, the gear 2, the gear 3, and the large bevel gear 5 are located between the lower shell 31 and the upper shell 1.

[0076] Preferably, in the present embodiment, a small bevel gear 34 is also connected to the upper housing 1 and engages with the large bevel gear 5; a manual emergency rotating shaft 33 is connected to the rear end of the small bevel gear 34; the outer end of the manual emergency rotating shaft 33 extends to the outside of the upper housing 1, as shown in Figure 6

[0077] When the motor 8 fails, we can choose to rotate the small bevel gear 34, which drives the large bevel gear 5 to rotate, and the large bevel gear 5 drives the motor shaft to rotate, and in turn drives the gear 6 connected to the motor shaft to rotate, so as to realize the rotation of the primary lead screw 12.

[0078] Preferably, the motor 8 is arranged in a motor housing 10, and the motor housing 10 is connected to the lower housing 31.

[0079] When the vehicle is running normally, the supporting legs are in the folded and stored state, and when support is needed after parking, we start the motor 8 to make the supporting legs change from the folded and stored state to the unfolded and deployed state, and make the ground support plate 18 move downward to abut against the ground to support the vehicle chassis. Correspondingly, by reversing the operation, the reverse retraction movement of the ground support plate 18 can be realized, so that the supporting pipe 22 is retracted into the inner cavity of the outer cylinder 24, and when the supporting legs return to the folded and stored state, the motor 8 stops running.

[0080] If the motor 8 fails to operate normally, we can also choose to manually rotate the manual emergency rotating shaft 33 with a wrench to drive the small bevel gear 34 to rotate, and in turn realize the reverse rotation of the primary lead screw 12, so as to realize the recovery of the supporting legs to the folded and stored state.​

Claims

1. A foldable motorized support leg, characterized by: The supporting leg body comprises a lower shell (31), an upper shell (1) connected to the upper end of the lower shell (31), a supporting leg mechanism and a motor mechanism; the mounting bracket (35) is hinged to the upper shell (1); the supporting leg mechanism and the motor mechanism are connected to the lower shell (31); The supporting leg mechanism comprises an outer cylinder (24) connected to the lower shell (31), a supporting pipe (22) sleeved in the inner cavity of the outer cylinder (24), a grounding support plate (18) connected to the lower end of the supporting pipe (22), a pushing assembly driving the supporting pipe (22) to move up and down, and a linkage lever assembly; the grounding support plate (18) is located below the lower end of the outer cylinder (24); The linkage lever assembly comprises a limiting pipe (13) sleeved on the outer wall of the outer cylinder (24), an extension pipe (19) sleeved on the outer wall of the limiting pipe (13), a spring (11) sleeved on the outer wall of the outer cylinder (24), and two linkage levers (41) symmetrically distributed on both sides of the outer cylinder (24); The lower end of the extension pipe (19) is fixed to the grounding support plate (18), and the upper end of the extension pipe (19) is connected to the outer wall of the limiting pipe (13); the spring (11) is located between the lower shell (31) and the limiting pipe (13); the upper end of the linkage lever (41) is hinged to the mounting bracket (35), and the lower end of the linkage lever (41) is connected to the pipe wall of the limiting pipe (13); The motor mechanism drives the pushing assembly to operate, and the pushing assembly drives the supporting pipe (22) to move up and down.

2. The foldable motorized support leg of claim 1, wherein: The pushing assembly comprises a primary screw rod (12), a primary nut (9) threadedly connected to the outer wall of the primary screw rod (12), a hollow secondary screw rod (26) located below the primary nut (9), a secondary nut (25) threadedly connected to the outer wall of the secondary screw rod (26), and a guide pipe (23) fixedly connected to the outer wall of the primary nut (9); The primary nut (9) and the guide pipe (23) are located in the inner cavity of the outer cylinder (24); the secondary nut (25) is located in the inner cavity of the guide pipe (23), and the upper part of the supporting pipe (22) is fixedly connected to the outer wall of the secondary nut (25); The primary screw rod (12) is inserted into the inner cavity of the secondary screw rod (26), and the inner wall of the secondary screw rod (26) and the primary screw rod (12) are connected by a key and a key groove, the key is located in the key groove and can move axially along the key groove; The upper end of the secondary screw rod (26) is provided with a transversely protruding stepped portion (261) in the radial direction, and the inner wall of the guide pipe (23) is provided with a limiting end (231) in the radial direction; the stepped portion (261) is located between the upper end of the limiting end (231) and the lower end of the primary nut (9); The motor mechanism comprises a motor (8) and a gear one (6) connected to the motor shaft of the motor (8); the outer wall of the primary screw rod (12) is fixed with a gear three (3); the gear one (6) drives the gear three (3) to rotate after rotating.

3. The foldable motorized support leg of claim 2, wherein: The electric supporting leg further comprises a micro switch (28); the micro switch (28) is installed at the lower end of the lower shell (31) and above the primary nut (9); when the primary nut (9) contacts the micro switch (28), the motor (8) stops running.

4. The foldable motorized support leg of claim 3, wherein: The inner wall of the mounting bracket (35) is further provided with a transversely extending stop rod (36); when the stop rod (36) abuts against the upper end surface of the upper shell (1), the supporting leg body can be prevented from continuing to rotate.

5. The foldable motorized support leg of claim 4, wherein: The gear two (4) is further connected between the gear one (6) and the gear three (3); the gear two (4) is engaged with the gear one (6) and the gear three (3) at the same time; the gear one (6), the gear two (4) and the gear three (3) are all located between the lower shell (31) and the upper shell (1).

6. The foldable motorized support leg of claim 5, wherein: The motor (8) is further connected with a Hall plate (17), and the motor shaft of the motor (8) is further connected with an electromagnetic ring (16).

7. The foldable motorized support leg of claim 6, wherein: The thrust bearing (2), the ball bearing (32) and the plane bearing (27) are further included; the thrust bearing (2), the ball bearing (32) and the plane bearing (27) are sleeved on the primary screw rod; and the plane bearing (27) is located between the lower end of the primary nut (9) and the upper end of the secondary screw rod (26).

8. A foldable motorised support leg according to any one of claims 2 to 7, wherein: The large bevel gear (5) is further included; the large bevel gear (5) is fixedly connected with the motor shaft of the motor (8). The large bevel gear (5) is located between the lower shell (31) and the upper shell (1). The upper shell (1) is further connected with a small bevel gear (34) engaged with the large bevel gear (5); the rear end of the small bevel gear is connected with a manual emergency rotating shaft (33); the outer end of the manual emergency rotating shaft (33) extends to the outside of the upper shell (1).

9. The foldable motorized support leg of claim 8, wherein: The motor housing (10) is further included; the motor (8) is arranged in the motor housing (10); the motor housing (10) is connected with the lower shell (31).

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