CN214828654U

CN214828654U - Heavy electric trailer jack

Info

Publication number: CN214828654U
Application number: CN202120985490.0U
Authority: CN
Inventors: 何叶婷
Original assignee: Ningbo Guterrui Auto Parts Co ltd
Current assignee: Ningbo Guterrui Auto Parts Co ltd
Priority date: 2021-05-10
Filing date: 2021-05-10
Publication date: 2021-11-23
Anticipated expiration: 2031-05-10

Abstract

The utility model provides a heavy electric trailer jack, which relates to the jack technical field, comprising a dustproof sleeve fixed in the outer tube and positioned outside the screw rod, and is used for preventing dust from attaching to the surface of the screw rod and increasing the friction force of the screw rod; the gear box is arranged beside the outer pipe, and the output end of the gear box is in transmission connection with the screw rod; the motor is arranged beside the gear box, and the output end of the motor is in transmission connection with the gear box; electromagnetic brake sets up the side at the motor, at the motor during operation, electromagnetic brake and motor separation, when electromagnetic brake shut down, electromagnetic brake is connected with the motor contact, the utility model discloses be different from ordinary lead screw, set up dustproof sleeve protection lead screw at the outside inside for the lead screw does not have sliding friction, therefore the resistance is minimum, shakes lightly conveniently by a wide margin than the hand jack that adopts ordinary lead screw under same load.

Description

Heavy electric trailer jack

Technical Field

The utility model relates to a jack technical field especially relates to heavy electric trailer jack.

Background

At present, the use of trailer jacks as automobile accessories is increasing, and most of the existing trailer jacks are used for supporting a trailer when the trailer is disconnected from a tractor. The trailer jack structure is equipped with the inner tube that is less than the outer tube top including installing the outer tube on the trailer in the outer tube, and the outer tube internal rotation is connected with the lead screw, and this lead screw passes the inner tube and with the lead screw nut threaded connection who fixes at the inner tube to the rotary motion who makes the lead screw turns into the up-and-down linear motion of inner tube, realizes the relative elevating movement of outer tube and inner tube. Therefore, the screw rod of the trailer jack is very important, once the screw rod is polluted and rusted, the stability of the jack is greatly influenced, and even safety accidents can be caused seriously. Meanwhile, the trailer jack generally adopts a mode of manually driving a screw rod to rotate, when the load is large, the trailer jack is usually difficult to shake, or the speed is changed through an internal gear box, so that the speed is slowed down to obtain stronger lifting capacity, but the lifting process is also very slow.

Disclosure of Invention

In view of the above, the present invention is directed to a heavy duty electric trailer jack that solves one or all of the problems set forth above in the background.

Based on the above object, the utility model provides a heavy electric trailer jack, include:

an outer tube mounted on the heavy electric trailer;

the screw rod is rotatably connected in the outer pipe;

the screw rod nut is in threaded connection with the screw rod;

with screw nut fixed connection's and the cover establish the inner tube in the outer tube, the one end of inner tube extends to the outside of outer tube, still includes:

the dustproof sleeve is fixed in the outer pipe, is positioned outside the screw rod and is used for preventing dust from attaching to the surface of the screw rod and increasing the friction force of the screw rod;

the gear box is arranged beside the outer pipe, and the output end of the gear box is in transmission connection with the screw rod;

the motor is arranged beside the gear box, and the output end of the motor is in transmission connection with the gear box;

the electromagnetic brake is arranged beside the motor, is separated from the motor when the motor works, and is in contact connection with the motor when the electromagnetic brake is stopped.

Optionally, the dustproof sleeve includes first dustproof sleeve and second dustproof sleeve that the suit is in the same place, a pot head of second dustproof sleeve is established in first dustproof sleeve, first dustproof sleeve and second dustproof sleeve keep away from each other the one end all with outer tube fixed connection.

Optionally, one end, away from the second dust sleeve, of the first dust sleeve is fixedly connected with the outer tube through a limiting plate fixed inside the outer tube, one end, away from the first dust sleeve, of the second dust sleeve is provided with a bottom support, and the second dust sleeve is fixedly connected with the outer tube through the bottom support.

Optionally, the gearbox comprises:

the outer shell is composed of a first gearbox shell and a second gearbox shell which are assembled together, and an output shaft of the motor extends into the outer shell;

the first linkage gear set is rotatably connected inside the outer shell and is in transmission connection with an output shaft of the motor;

the second linkage gear set is rotatably connected inside the outer shell and is in transmission connection with the first linkage gear set;

and the third linkage gear set is rotatably connected inside the outer shell and is in transmission connection with the second linkage gear set.

Optionally, first linkage gear train is established including rotating first universal driving shaft, the coaxial cover of connecting in the shell first linkage gear and the second linkage gear on the first universal driving shaft, first linkage gear is connected with the output shaft transmission of motor, and second linkage gear train is established including rotating second linkage shaft, the coaxial cover of connecting in the shell second linkage shaft and fourth linkage gear on the second linkage shaft, third linkage gear and second linkage shaft meshing, third linkage gear train are established including rotating third linkage shaft and the coaxial cover of connecting in the shell fifth linkage gear on the third linkage shaft, fifth linkage gear and fourth linkage gear meshing.

Optionally, a limiting block is fixed outside the screw rod nut, and the screw rod nut is connected with the inner pipe through the limiting block.

Optionally, the inner pipe is provided with a first limiting bolt, the first limiting bolt is arranged close to the gear box, and when the inner pipe is at the deepest position retracted into the outer pipe, the screw rod nut abuts against the first limiting bolt.

Optionally, a safety bolt is arranged at the end part of the inner pipe close to one end of the outer pipe extending out of the inner pipe, a fastening bolt is connected to the inner pipe in a threaded manner, and the fastening bolt abuts against the safety bolt.

Optionally, a gasket is fixed at one end of the outer pipe, a second limiting bolt is arranged on the screw rod, and the second limiting bolt abuts against the gasket.

Optionally, one end of the inner pipe extending out of the outer pipe is hinged with a foot rest through a foot rest bolt.

From the above, can see that the utility model provides a heavy electric trailer jack rotates through gear box and motor drive lead screw to have powerful heavy-duty ability and the advantage of quick hoisting speed simultaneously, the gear box cooperatees with the motor and can reaches-doubly speed ratio simultaneously, makes the rotational speed of lead screw still show the rotational speed that is higher than ordinary hand jack. Different from the common screw rod, the dustproof sleeve is arranged in the outer pipe to protect the screw rod, so that the screw rod has no sliding friction force, the resistance is very little, and the screw rod is greatly portable and convenient to shake under the same load compared with a hand jack adopting the common screw rod. The electromagnetic brake coaxial with the motor is installed in a matched mode on the motor, the motor is in a brake state under the condition that the motor is not electrified, the positions of the screw rod nut and the inner tube are fixed, and only when the motor is electrified, the electromagnetic brake can be separated from the electromagnetic brake, so that the output shaft of the electromagnetic brake can rotate freely.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural view of the heavy electric trailer jack of the present invention;

fig. 2 is a schematic plan view of the heavy electric trailer jack of the present invention;

FIG. 3 is a schematic cross-sectional view taken along line A-A of FIG. 2;

FIG. 4 is an exploded view of the gear box of the heavy duty electric trailer jack of the present invention;

fig. 5 is a schematic plan view of a gear box of the heavy electric trailer jack of the present invention;

FIG. 6 is a schematic cross-sectional view taken along line B-B of FIG. 5;

FIG. 7 is a schematic plan view of a screw rod of the heavy electric trailer jack of the present invention;

FIG. 8 is a schematic cross-sectional view taken at C-C of FIG. 7;

fig. 9 is an explosion diagram of the screw rod in the heavy electric trailer jack of the present invention.

Wherein: 1-a foot rest; 2-a foot rest bolt; 3-inner tube; 4-an outer tube; 5-a screw rod; 6-lead screw nut; 7-rocking ball pads; 8-a first dust sleeve; 9-a second dust sleeve; 10-a limiting plate; 11-a limiting block; 12-a first limit bolt; 13-safety bolt; 14-a fastening bolt; 15-a second limit bolt; 16-a gasket; 17-a gearbox; 18-a first gearbox housing; 19-a second gearbox housing; 20-a first linkage shaft; 21-a first linkage gear; 22-a second linkage gear; 23-a second linkage shaft; 24-a third gear; 25-a fourth linkage gear; 26-a third coupling shaft; 27-a fifth linkage gear; 28-a motor; 29-electromagnetic braking; 30-an outer casing; 31-a mounting plate; 32-shoe.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings.

It should be noted that unless otherwise defined, technical or scientific terms used in the embodiments of the present invention should have the ordinary meaning as understood by those having ordinary skill in the art to which the present disclosure belongs. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

As a preferred embodiment of the present invention, the utility model provides a heavy electric trailer jack, include:

an outer tube mounted on the heavy electric trailer;

the screw rod is rotatably connected in the outer pipe;

the screw rod nut is in threaded connection with the screw rod;

The heavy electric trailer jack drives the screw rod to rotate through the gear box and the motor, so that the heavy electric trailer jack has the advantages of strong heavy load capacity and high speed lifting speed, and meanwhile, the gear box and the motor are matched to achieve a-time speed ratio, so that the rotating speed of the screw rod is still obviously higher than that of a common hand-operated jack. Different from the common screw rod, the dustproof sleeve is arranged in the outer pipe to protect the screw rod, so that the screw rod has no sliding friction force, the resistance is very little, and the screw rod is greatly portable and convenient to shake under the same load compared with a hand jack adopting the common screw rod. The electromagnetic brake coaxial with the motor is installed in a matched mode on the motor, the motor is in a brake state under the condition that the motor is not electrified, the positions of the screw rod nut and the inner tube are fixed, and only when the motor is electrified, the electromagnetic brake can be separated from the electromagnetic brake, so that the output shaft of the electromagnetic brake can rotate freely.

The following describes preferred embodiments of the heavy duty electric trailer jack according to the present invention with reference to the accompanying drawings.

Referring to fig. 1 to 3, the heavy duty electric trailer jack has a structure similar to that of a conventional jack, and specifically includes:

install outer tube 4 on the trailer, rotate lead screw 5 of connection in outer tube 4, with 5 threaded connection's of lead screw nut 6 and with lead screw nut 6 fixed connection and the cover establish inner tube 3 in outer tube 4, wherein, the one end of inner tube 3 extends to the outside of outer tube 4, and inner tube 3 extends to the outer one end of outer tube 4 and has articulated foot rest 1 through foot rest bolt 2. Preferably, a plurality of mounting plates 31 may be provided on the outer tube 4 for connection to a trailer.

When the screw rod 5 rotates, the rotary motion of the screw rod 5 can be converted into the up-and-down linear motion of the screw rod nut 6 and the inner pipe 3, so that the relative lifting motion of the outer pipe 4 and the inner pipe 3 is realized, and a jack is formed. It will be appreciated that the power source for the heavy duty electric trailer jack is electric rather than hand-operated as before. In this embodiment, a swing ball pad 7 for allowing the screw 5 to swing freely may be provided in the outer tube 4.

In this embodiment, a limiting block 11 is fixed outside the lead screw nut 6, and the lead screw nut 6 is connected with the inner tube 3 through the limiting block 11. The limiting block 11 is arranged to limit unnecessary rotational displacement of the lead screw nut 6, so that the lead screw nut 6 is linearly lifted during displacement.

This heavy electric trailer jack still includes:

the dustproof sleeve is fixed in the outer tube 4 and located outside the screw rod 5, is used for preventing pollutants such as dust from being attached to the surface of the screw rod 5 and increasing the friction force of the screw rod 5, is different from an ordinary screw rod, and is arranged inside the outer tube 4 to protect the screw rod 5, so that the screw rod 5 does not have sliding friction force, the resistance is extremely low, and the dustproof sleeve is light and convenient to shake greatly compared with a hand jack adopting the ordinary screw rod under the same load.

And the gear box 17 is arranged beside the outer pipe 4, and the output end of the gear box 17 is in transmission connection with the screw rod 5.

The motor 28 is arranged beside the gear box 17, an output end of the motor 28 is in transmission connection with the gear box 17, in this embodiment, the motor 28 can adopt a direct current motor, the motor 28, the gear box 17 and the screw rod 5 are combined for use, the motor 28 can rotate in the positive direction and the negative direction, is in bidirectional driving, and is controlled by the positive and negative poles of an input end of the motor 28. Particularly, when the heavy-duty electric trailer jack is applied to the jack, the screw rod 5 rotates forwards and reversely, so that the heavy-duty electric trailer jack has the driving capability of ascending and descending.

And the electromagnetic brake 29 is arranged beside the motor 28, the electromagnetic brake 29 is separated from the motor 28 when the motor 28 works, and the electromagnetic brake 29 is in contact connection with the motor 28 when the electromagnetic brake 29 is stopped. In order to avoid that the screw rod nut 6 cannot stop at the current position by means of friction force with the screw rod 5, the screw rod nut 6 automatically rotates and descends under the driving of gravity and load, namely, the heavy-duty electric trailer jack cannot be supported at a fixed position, an electromagnetic brake 29 coaxial with the motor is arranged on the motor 28 in a matching mode, the electromagnetic brake 29 is in a braking state under the condition that the motor 28 is not electrified, so that the positions of the screw rod nut 6 and the inner pipe 3 are fixed, and only when the motor 28 is electrified, the electromagnetic brake 29 is separated from the electromagnetic brake 29, so that an output shaft of the electromagnetic brake 29 can rotate freely.

In this embodiment, the gearbox 17, motor 28 and electromagnetic brake 29 are mounted within an outer casing 30.

Referring to fig. 7 to 9, the dustproof sleeve includes a first dustproof sleeve 8 and a second dustproof sleeve 9 which are sleeved together, one end of the second dustproof sleeve 9 is sleeved in the first dustproof sleeve 8, and the ends of the first dustproof sleeve 8 and the second dustproof sleeve 9 which are far away from each other are fixedly connected with the outer tube 4.

In this embodiment, the end of the first dust-proof sleeve 8 away from the second dust-proof sleeve 9 is fixedly connected with the outer tube 4 through the limiting plate 10 fixed inside the outer tube 4, the end of the second dust-proof sleeve 9 away from the first dust-proof sleeve 8 is provided with a bottom support 32, and the second dust-proof sleeve 9 is fixedly connected with the outer tube 4 through the bottom support 32.

Referring to fig. 4 to 6, the gear box 17 includes:

the outer shell comprises a first gear box shell 18 and a second gear box shell 19 which are assembled together, an output shaft of a motor 28 extends into the outer shell and is connected with a first gear set, a second gear set and a third gear set inside the outer shell in a rotating mode, wherein the first gear set is in transmission connection with the output shaft of the motor 28, the second gear set is in transmission connection with the first gear set, and the third gear set is in transmission connection with the second gear set.

More specifically, the first linkage gear set comprises a first linkage shaft 20 rotatably connected in the outer shell, a first linkage gear 21 and a second linkage gear 22 coaxially sleeved on the first linkage shaft 20, the first linkage gear 21 is in transmission connection with an output shaft of a motor 28, the second linkage gear set comprises a second linkage shaft 23 rotatably connected in the outer shell, a third linkage gear 24 and a fourth linkage gear 25 coaxially sleeved on the second linkage shaft 23, the third linkage gear 24 is meshed with the second linkage shaft 23, the third linkage gear set comprises a third linkage shaft 26 rotatably connected in the outer shell and a fifth linkage gear 27 coaxially sleeved on the third linkage shaft 26, and the fifth linkage gear 27 is meshed with the fourth linkage gear 25. In this embodiment, the portion of the output shaft of the motor 28 located in the outer casing can be connected with a gear in a transmission manner, and then meshed with the first linkage gear 21 through the gear.

The heavy electric trailer jack driven by the gear box 17 is connected with the screw rod 5 through the gear box 17, and the gear box 17 is used for reducing the rotating speed and increasing the torque. The idling speed of a general direct current motor is more than 1800 rpm, the rotating speed under the load is quite high, and the output torque is limited and is not enough to directly drive the load such as the screw rod 5 used by the jack. Therefore, the heavy electric trailer jack adopts 3 groups of coupling gears to carry out 2 times of speed change, and the speed ratio, namely the torque, which is 20-50 times can be correspondingly increased to 20-50 times.

The inside first spacing bolt 12 that is equipped with of outer tube 4, first spacing bolt 12 is close to the setting of gear box 17, and this heavy electric trailer jack is in the state of most contracting when the inner tube 3 is in the deepest position of withdrawal in the outer tube 4 promptly, and lead screw nut 6 offsets with first spacing bolt 12, and first spacing bolt 12 is spacing to the kinematic position of lead screw nut 6. Similarly, a safety bolt 13 is arranged at the end part of the inner pipe 3 close to the end part of the outer pipe 4 extending out of the inner pipe 3, a fastening bolt 14 is connected to the inner pipe 3 in a threaded manner, and the fastening bolt 14 abuts against the safety bolt 13. When the inner pipe 3 is at the farthest position extending into the outer pipe 4, that is, the heavy-duty electric trailer jack is at the most extended state, the safety bolt 13 abuts against the first limit bolt 12, and the safety bolt 13 also limits the movement position of the screw rod nut 6.

In this embodiment, a gasket 16 is fixed to one end of the outer tube 4, a second limit bolt 15 is arranged on the screw rod 5, the second limit bolt 15 abuts against the gasket 16, the second limit bolt 15 is matched with the gasket 16 to limit the screw rod 5, and the screw rod 5 can be prevented from falling off due to gravity.

Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the idea of the invention, also technical features in the above embodiments or in different embodiments can be combined, steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.

The present embodiments are intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Therefore, any omission, modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims

1. A heavy duty electric trailer jack comprising:

an outer pipe (4) mounted on the heavy electric trailer;

a screw rod (5) rotatably connected in the outer pipe (4);

the screw rod nut (6) is in threaded connection with the screw rod (5);

with screw nut (6) fixed connection's and cover establish inner tube (3) in outer tube (4), the one end of inner tube (3) extends to the outside of outer tube (4), its characterized in that still includes:

the dustproof sleeve is fixed in the outer tube (4), is positioned outside the screw rod (5), and is used for preventing dust from attaching to the surface of the screw rod (5) and increasing the friction force of the screw rod (5);

the gear box (17) is arranged beside the outer pipe (4), and the output end of the gear box (17) is in transmission connection with the screw rod (5);

the motor (28) is arranged beside the gear box (17), and the output end of the motor (28) is in transmission connection with the gear box (17);

the electromagnetic brake (29) is arranged beside the motor (28), when the motor (28) works, the electromagnetic brake (29) is separated from the motor (28), and when the electromagnetic brake (29) stops, the electromagnetic brake (29) is in contact connection with the motor (28).

2. The heavy-duty electric trailer jack of claim 1, wherein the dust-proof sleeve comprises a first dust-proof sleeve (8) and a second dust-proof sleeve (9) which are sleeved together, one end of the second dust-proof sleeve (9) is sleeved in the first dust-proof sleeve (8), and the ends of the first dust-proof sleeve (8) and the second dust-proof sleeve (9) which are far away from each other are fixedly connected with the outer tube (4).

3. The heavy-duty electric trailer jack according to claim 2, wherein one end of the first dust sleeve (8) far away from the second dust sleeve (9) is fixedly connected with the outer tube (4) through a limiting plate (10) fixed inside the outer tube (4), one end of the second dust sleeve (9) far away from the first dust sleeve (8) is provided with a bottom support (32), and the second dust sleeve (9) is fixedly connected with the outer tube (4) through the bottom support (32).

4. A heavy duty electric trailer jack according to claim 1, wherein the gear box (17) comprises:

an outer housing formed by a first gearbox housing (18) and a second gearbox housing (19) assembled to each other, an output shaft of the motor (28) extending into the outer housing;

the first linkage gear set is rotationally connected inside the outer shell and is in transmission connection with an output shaft of the motor (28);

5. The heavy-duty electric trailer jack of claim 4, wherein the first linkage gear set comprises a first linkage shaft (20) rotatably connected in the outer shell, a first linkage gear (21) and a second linkage gear (22) coaxially sleeved on the first linkage shaft (20), the first linkage gear (21) is in transmission connection with an output shaft of the motor (28), the second linkage gear set comprises a second linkage shaft (23) rotatably connected in the outer shell, a third linkage gear (24) and a fourth linkage gear (25) coaxially sleeved on the second linkage shaft (23), the third linkage gear (24) is engaged with the second linkage shaft (23), the third linkage gear set comprises a third linkage shaft (26) rotatably connected in the outer shell and a fifth linkage gear (27) coaxially sleeved on the third linkage shaft (26), and the fifth linkage gear (27) is meshed with the fourth linkage gear (25).

6. The jack for heavy electric trailers according to claim 1, characterized in that a stopper (11) is fixed outside the lead screw nut (6), and the lead screw nut (6) is connected with the inner tube (3) through the stopper (11).

7. A heavy duty electric trailer jack as claimed in claim 1 wherein the outer tube (4) has a first limit latch (12) disposed therein, the first limit latch (12) being disposed adjacent the gear box (17), the lead screw nut (6) abutting the first limit latch (12) when the inner tube (3) is in its deepest position retracted into the outer tube (4).

8. The jack for heavy electric trailers according to claim 1, characterized in that the end of the inner tube (3) near the end of the outer tube (4) extending outside the inner tube (3) is provided with a safety bolt (13), the inner tube (3) is connected with a fastening bolt (14) in a threaded manner, and the fastening bolt (14) abuts against the safety bolt (13).

9. The jack for heavy electric trailers according to claim 1, wherein a spacer (16) is fixed at one end in the outer tube (4), a second limit bolt (15) is arranged on the screw rod (5), and the second limit bolt (15) is abutted against the spacer (16).

10. A heavy duty electric trailer jack as claimed in claim 1 in which the end of the inner tube (3) extending outside the outer tube (4) is hinged to a foot rest (1) by a foot rest pin (2).