Oil lubrication structure of trailer supporting leg and trailer supporting leg

Abstract

The utility model discloses an oil lubrication structure of a trailer supporting leg and the trailer supporting leg. The oil lubrication structure of the trailer supporting leg comprises a hollow inner supporting leg, a lead screw located in the inner supporting leg, a nut fixed to the top of the inner supporting leg, an oil cylinder located in the inner supporting leg and a supporting piece. The nut is arranged outside the lead screw in a sleeving mode and matched with the lead screw in a threaded mode, the oil cylinder is arranged outside the lead screw in a sleeving mode, a top opening of the oil cylinder is arranged at the bottom end of the nut in a sleeving mode, a buckle assembly is arranged on the peripheral face of the oil cylinder, the supporting piece is arranged outside the oil cylinder in a sleeving mode, and the inner edge of the supporting piece is matched with the buckle assembly to limit the freedom degree of vertical movement of the supporting piece relative to the oil cylinder. The outer edge of the supporting piece abuts against the inner side face of the inner supporting leg. According to the utility model, the supporting piece can provide stable support for the oil cylinder, prevent the oil cylinder from shaking and ensure that the oil cylinder is stably matched with the inner supporting leg, so that the screw rod and the nut are continuously lubricated, the structure is simple, and the oil cylinder is convenient to install.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicles, in particular to an oil lubrication structure for a trailer leg and a trailer leg. Background Art

[0002] The legs of a trailer are used to support the trailer when the trailer is separated from the tractor. Generally, they include an inner leg, an outer leg, a lead screw, a nut, and a gear transmission assembly. By rotating the input shaft of the trailer leg, power is transmitted to the lead screw through the gear transmission assembly. The lead screw drives the nut to move up and down, and then the inner leg and the outer leg are telescoped to realize the lifting of the trailer leg. When the lead screw and the nut rotate relative to each other, a certain friction will be generated due to the meshing of their screw teeth. Therefore, it is necessary to use lubricating oil to lubricate the position where the lead screw and the nut are combined. Since the lead screw is placed in the inner leg, in order to fully lubricate the cooperation between the lead screw and the nut, in the prior art, an oil cylinder is usually sleeved outside the lead screw, and the inside of the oil cylinder is filled with lubricating oil. Through the rotation of the lead screw, the lubricating oil enters the gap of the screw teeth of the lead screw, and then lubricates the cooperation between the lead screw and the nut. However, in the prior art, since the inner leg is of a tubular structure and the oil cylinder is strip-shaped, it is difficult to install the oil cylinder in the inner leg and stably fix it to the inner leg. Summary of the Utility Model

[0003] Aiming at the deficiencies of the prior art, the first object of the utility model is to propose an oil lubrication structure for a trailer leg, which can conveniently install the oil cylinder into the inner leg and ensure the stable cooperation between the oil cylinder and the inner leg, so as to continuously lubricate the lead screw and the nut.

[0004] The second object of the utility model is to propose a trailer leg.

[0005] To achieve the first object, the utility model adopts the following technical scheme:

[0006] The oil lubrication structure of a trailer leg includes a hollow inner leg, a lead screw located inside the inner leg, a nut fixed at the top of the inner leg, an oil cylinder located inside the inner leg, and a support member;

[0007] The nut is sleeved outside the lead screw and is in threaded cooperation with the lead screw. The oil cylinder is sleeved outside the lead screw. The top opening of the oil cylinder is sleeved on the bottom end of the nut. A buckle assembly is arranged on the outer peripheral surface of the oil cylinder. The support member is sleeved outside the oil cylinder. The inner edge of the support member cooperates with the buckle assembly to limit the degree of freedom of the support member moving up and down relative to the oil cylinder. The outer edge of the support member abuts against the inner side surface of the inner leg.

[0008] The snap component includes an upper convex block and a lower convex block arranged at a certain distance from the upper convex block; the outer edge surface of the upper convex block forms an upper inclined surface that gradually inclines away from the central axis of the oil cylinder from top to bottom, and / or the outer edge surface of the lower convex block forms a lower inclined surface that gradually inclines away from the central axis of the oil cylinder from bottom to top.

[0009] The support member is plate-shaped, and is provided with a through hole for the oil cylinder to penetrate. At the edge of the through hole on the support member, there is a socket portion extending upward or downward, and the upper and lower end surfaces of the socket portion respectively abut against the upper convex block and the lower convex block.

[0010] The outer edge of the support member includes four side edges, and concave positions are respectively arranged on two opposite side edges and recess inward.

[0011] The bottom of the nut is provided with a connecting shaft head extending downward. The top of the oil cylinder is sleeved on the connecting shaft head, and the inner surface of the oil cylinder is in sealed cooperation with the outer edge surface of the connecting shaft head.

[0012] A bottom plate is fixedly connected to the bottom of the inner leg, and the bottom plate supports below the bottom end surface of the oil cylinder.

[0013] A retaining piece perpendicular to the axis of the screw rod is fixedly connected to the bottom of the screw rod, and the outer diameter of the retaining piece is larger than the diameter of the screw rod.

[0014] To achieve the second above-mentioned purpose, the present utility model adopts the following technical solutions:

[0015] The trailer leg includes the oil lubrication structure of the above-mentioned trailer leg.

[0016] The beneficial effects of the present utility model are as follows:

[0017] In the present utility model, by abutting the outer edge of the support member against the inner side surface of the inner leg, the support member provides support for the oil cylinder in the radial direction of the inner leg, and the snap component on the oil cylinder is used to limit the degree of freedom of the support member moving up and down relative to the oil cylinder, so that the support member is fixed to the oil cylinder, preventing the support member from moving up and down, and ensuring that the support member can provide stable support for the oil cylinder; since the oil cylinder is supported in the radial direction by the support member, when the trailer leg is in use, the screw rod moves up and down inside the oil cylinder to stir the lubricating oil inside the oil cylinder, without causing the oil cylinder to shake, ensuring the stable cooperation between the oil cylinder and the inner leg, thereby continuously lubricating the screw rod and the nut; during installation, after the support member is sleeved on the oil cylinder, then the whole is installed into the inner leg, with a simple structure and convenient installation of the oil cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of the present utility model;

[0019] Figure 2 is Figure 1 the enlarged view at A in

[0020] Figure 3 For Figure 1 Schematic diagram of the structure of the oil cylinder

[0021] Figure 4 For Figure 1 Schematic diagram of the structure of the middle support Specific implementation mode

[0022] Next, in combination with the drawings and specific implementation modes, the present utility model will be further described:

[0023] As Figure 1 、 2 shown, an oil lubrication structure of a trailer leg of the present utility model includes a hollow inner leg 10, a lead screw 20, a nut 30, an oil cylinder 40, and a support 50. The inner leg 10 is a hollow tubular structure. The lead screw 20 is located in the inner leg 10. The nut 30 is fixedly connected to the top of the inner leg 10, and the nut 30 is arranged outside the lead screw 20 and is in threaded cooperation with the lead screw. The oil cylinder 40 is located inside the inner leg 10, and the oil cylinder 40 is sleeved outside the lead screw. The top opening of the oil cylinder 40 is sleeved on the bottom end of the nut 30. Lubricating oil is contained inside the oil cylinder 40, so that the lead screw 20 is immersed in the lubricating oil inside the oil cylinder 40. During the use of the trailer leg, as the lead screw 20 moves up and down relative to the nut 30, the gap between the lead screw 20 and the nut 30 can always be kept with sufficient lubricating oil. A buckle assembly is arranged on the outer peripheral surface of the oil cylinder 40. The support 50 is sleeved outside the oil cylinder 40. The inner edge of the support 50 is in snap-fit with the buckle assembly. The degree of freedom of the support 50 moving up and down relative to the oil cylinder 40 is limited by the buckle assembly. The outer edge of the support 50 abuts against the inner side surface of the inner leg 10.

[0024] In the present utility model, by the outer edge of the support 50 abutting against the inner side surface of the inner leg 10, the support 50 provides support for the oil cylinder 40 in the radial direction of the inner leg 10, and the degree of freedom of the support 50 moving up and down relative to the oil cylinder 40 is limited by the buckle assembly on the oil cylinder 40, so that the support 50 is fixed to the oil cylinder 40, preventing the support 50 from moving up and down, ensuring that the support 50 can provide stable support for the oil cylinder 40; since the oil cylinder 40 is supported in the radial direction by the support 50, when the trailer leg is in use, the lead screw 20 moves up and down inside the oil cylinder 40 to stir the lubricating oil inside the oil cylinder 40, and the oil cylinder 40 will not shake, ensuring the stable cooperation between the oil cylinder and the inner leg, thereby continuously lubricating the lead screw and the nut; during installation, after the support 50 is sleeved on the oil cylinder 40, then the whole is installed into the inner leg 10, with a simple structure and convenient installation of the oil cylinder 40.

[0025] In a preferred embodiment, the snap component includes an upper bump 41 and a lower bump 42. The upper bump 41 and the lower bump 42 are offset from each other by a certain distance in the extending direction of the oil cylinder 40. The outer edge surface of the upper bump 41 forms an upper inclined surface 411 that gradually inclines away from the central axis of the oil cylinder 40 from top to bottom. That is to say, the outer diameter of the upper bump 41 gradually increases from top to bottom. When the support member 50 is connected to the oil cylinder 40, the support member 50 is sleeved on the outside of the oil cylinder 40 from top to bottom. After moving downward along the upper inclined surface 411, the inner edge of the support member 50 is snapped between the upper bump 41 and the lower bump 42. In other embodiments, it may also be that a lower inclined surface that gradually inclines away from the central axis of the oil cylinder 40 from bottom to top is provided on the outer edge surface of the lower bump 42. When the support member 50 is connected to the oil cylinder 40, the support member 50 is sleeved on the outside of the oil cylinder 40 from bottom to top. After moving upward along the lower inclined surface, the inner edge of the support member 50 is snapped between the lower bump 42 and the upper bump 41. Of course, it may also be that the upper inclined surface 411 is provided on the upper bump 41 and the lower inclined surface is provided on the lower bump 42 at the same time. It is possible to choose to install the support member 50 from the top of the oil cylinder 40 or from the bottom of the oil cylinder 40. The support member 50 is in a plate shape and is formed by bending a metal sheet or processed from a plastic material. A through hole 52 for the oil cylinder 40 to pass through is provided on the support member 50. A socket portion 51 extending upward is provided at the edge of the through hole 52 on the support member 50. The upper end surface of the socket portion 51 abuts against the upper bump 41, and the lower end surface abuts against the lower bump 42. By providing the socket portion 51, the portion of the inner edge of the support member 50 in contact with the oil cylinder 40 has a larger axial dimension, and then the cooperation between the support member 50 and the oil cylinder 40 is more stable, further avoiding the shaking of the oil cylinder 40. The above-mentioned socket portion 51 may also be formed by extending downward from the edge of the through hole 52. In addition, the outer edge of the support member 50 includes four side edges, so that the support member 50 forms a structure that is consistent with the inner edge shape of the cross section of the inner leg 10. Concave positions 53 that are recessed inward are respectively provided on two opposite side edges of the support member 50. By providing the concave positions 53, when the edge of the support member 50 and the inner side surface of the inner leg 10 are pressed against each other, the support member 50 undergoes a certain deformation. Through the elastic stress generated after the deformation of the support member 50, the edge of the support member 50 can be better abutted and fixed to the inner leg 10.

[0026] A connecting shaft head 31 extending downward is provided at the bottom of the nut 30. The top of the oil cylinder 40 is sleeved on the connecting shaft head 31. The inner wall at the top opening of the oil cylinder 40 is in tight fit with the connecting shaft head 31, so that the inner surface at the top opening of the oil cylinder 40 is in airtight fit with the outer edge surface of the connecting shaft head 31 to ensure the sealing performance at the connection between the oil cylinder 40 and the nut 30 and prevent the lubricating oil from leaking out from the top of the oil cylinder 40. In addition, a bottom plate 11 is fixedly connected to the bottom of the inner leg 10. The bottom plate 11 supports below the bottom end surface of the oil cylinder 40 to limit the degree of freedom of downward movement of the oil cylinder 40, so that the top opening of the oil cylinder 40 can be stably sleeved on the connecting shaft head 31 of the nut 30.

[0027] A retaining piece 21 is also fixedly connected to the bottom of the lead screw 20. The retaining piece 21 is perpendicular to the lead screw 20, and the outer diameter of the retaining piece 21 is larger than the diameter of the lead screw 20. In this way, when the lead screw 20 moves up and down inside the oil cylinder 40, the retaining piece 21 can be used to stir the lubricating oil inside the oil cylinder 40, so that the lubricating oil can be embedded into the thread gap of the lead screw 20 and then enter the gap between the lead screw 20 and the nut 30 along with the up and down movement of the lead screw 20.

[0028] The trailer leg of the present utility model includes the oil lubrication structure of the above-mentioned trailer leg. The other structures of the trailer leg are the same as those in the prior art and will not be described in detail here.

[0029] The above embodiments are only used to illustrate the technical solutions of the present utility model and are not intended to limit the same; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features, and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims

1. The oil lubrication structure of the trailer leg is characterized by: It includes a hollow inner leg, a screw rod located inside the inner leg, a nut fixed on the top of the inner leg, an oil cylinder located inside the inner leg, and a support member; The nut is sleeved on the outside of the screw and cooperates with the screw thread, the oil cylinder is sleeved on the outside of the screw, the top opening of the oil cylinder is sleeved on the bottom end of the nut, a snap assembly is provided on the outer circumferential surface of the oil cylinder, the support piece is sleeved on the outside of the oil cylinder, the inner edge of the support piece cooperates with the snap assembly to limit the freedom of the support piece to move up and down relative to the oil cylinder, and the outer edge of the support piece abuts against the inner side surface of the inner leg.

2. The oil lubrication structure of the trailer leg according to claim 1, characterized in that: The buckle assembly includes an upper protrusion and a lower protrusion spaced apart from the upper protrusion; the outer edge surface of the upper protrusion forms an upper inclined surface that gradually tilts away from the central axis of the oil cylinder from top to bottom, and / or the outer edge surface of the lower protrusion forms a lower inclined surface that gradually tilts away from the central axis of the oil cylinder from bottom to top.

3. The oil lubrication structure of the trailer leg according to claim 2, characterized in that: The support is plate-shaped and is provided with a through hole for the oil supply cylinder to pass through. A sleeve portion extending upward or downward is provided on the edge of the through hole on the support, and the upper and lower end surfaces of the sleeve portion respectively abut against the upper and lower protrusions.

4. The oil lubrication structure of the trailer leg according to claim 3, characterized in that: The outer edge of the support member includes four side edges, and two opposite side edges are respectively provided with concave positions recessed toward the inside.

5. The oil lubrication structure of the trailer leg according to claim 1, characterized in that: The bottom of the nut is provided with a connecting shaft head extending downwards, the top of the oil cylinder is sleeved on the connecting shaft head, and the inner surface of the oil cylinder is tightly matched with the outer edge surface of the connecting shaft head.

6. The oil lubrication structure of the trailer leg according to claim 1, characterized in that: The bottom of the inner leg is fixedly connected with a bottom plate, and the bottom plate is supported below the bottom end surface of the oil cylinder.

7. The oil lubrication structure of the trailer leg according to claim 1, characterized in that: The bottom of the screw rod is fixedly connected with a baffle which is perpendicular to the axis of the screw rod, and the outer diameter of the baffle is greater than the diameter of the screw rod.

8. Trailer legs, characterized in that: The oil lubrication structure of the trailer leg comprises the oil lubrication structure of any one of claims 1-7.

Images