Anti-rustling structure of screw jack

Abstract

The utility model relates to a screw jack's anti -abnormal sound structure belongs to hoisting equipment technical field. Including base, cover, shell, guide pipe, with the bearing cavity in the base adaptation installation's thrust bearing, with thrust bearing adaptation connection's gear assembly, by gear assembly drive's screw pair subassembly and set up in the top of screw pair subassembly's top head subassembly, screw pair subassembly include top rod, big screw rod and small screw rod from outside to inside set up in guide pipe, small screw rod's bottom connect gear assembly, top head subassembly set up in top rod's top, anti -abnormal sound structure still include gasket and sealing ring, gasket set up in bearing cavity and be located thrust bearing below, sealing ring surrounds big screw rod and is used for filling the gap between top head subassembly and cover. Advantage: can solve the abnormal sound problem that jack appears because of the above-mentioned gap, simple structure, and the improvement cost is low.

Description

Technical Field

[0001] This utility model belongs to the field of lifting equipment technology, specifically relating to an anti-noise structure for a screw jack. Background Technology

[0002] A screw jack is a manual lifting tool, mainly consisting of a base, housing, handle, drive gear, driven gear, bearing assembly, threaded assembly, jack assembly, and outer sleeve. Its working principle involves utilizing the swing of the handle, which, through the transmission of the drive and driven gears, drives the threaded assembly to rotate, thus pushing the jack assembly to lift or lower heavy objects. Screw jacks are widely used in industrial fields such as automotive repair, bridge construction, and heavy equipment installation due to their strong mechanical self-locking, high load-bearing capacity, and long working stroke.

[0003] The aforementioned screw jacks have inherent defects that have long remained unresolved. Due to the limitations of their mating structure, mechanical clearances are unavoidable in the transmission components, such as the clearance between the threaded assembly and the outer sleeve, and the clearance between the bearing assembly and the base. These clearances cause the screw jacks to make abnormal noises due to severe impacts in handling, transporting, or vibrating working environments. This not only requires time to check and confirm their reliability, affecting work efficiency, but also accelerates equipment damage, turning small problems into major, irreparable ones, and increasing equipment replacement costs.

[0004] In view of the above-mentioned existing technology, it is necessary to improve the structure of the existing screw jack. To this end, the applicant has made a useful design, and the technical solution to be introduced below is produced in this context. Utility Model Content

[0005] The purpose of this invention is to provide a noise-proof structure for a screw jack, which can effectively eliminate internal gaps in the transmission structure and reduce noise generated in a vibrating environment, thereby effectively improving operational stability and quietness.

[0006] The purpose of this utility model is to provide an anti-noise structure for a screw jack, comprising a base, an outer sleeve with openings at both ends, a shell connecting the base and the outer sleeve, a guide tube fitted inside the outer sleeve, a thrust bearing adapted to and installed in the bearing cavity within the base, a gear assembly adapted to and connected to the thrust bearing, a screw pair assembly driven by the gear assembly, and a top assembly disposed on top of the screw pair assembly. The screw pair assembly includes a top rod, a large lead screw, and a small lead screw arranged sequentially from the outside to the inside within the guide tube. The bottom of the small lead screw is connected to the gear assembly, and the small lead screw and the large lead screw form a primary threaded pair. The large lead screw and the top rod form a secondary threaded pair. The top assembly is disposed on top of the top rod. The anti-noise structure also includes a gasket and a sealing ring. The gasket is disposed within the bearing cavity and located below the thrust bearing. The sealing ring is arranged around the large lead screw to fill the gap between the top assembly and the outer sleeve.

[0007] In a specific embodiment of this utility model, the top assembly includes a top pin and a top support plate. The top support plate is configured as a cylindrical structure with openings at both ends. The bottom of the top pin is extended with a step, which is installed with the upper opening of the top support plate for limiting. The top support plate is sleeved on the top of the top rod and is interference-fitted with the top rod. The sealing ring is disposed between the bottom end of the top support plate and the top end of the outer sleeve.

[0008] In another specific embodiment of this utility model, the gear assembly includes a bevel gear, a bevel gear, and a torsion handle. The bevel gear is disposed above the thrust bearing and is adapted to be installed with the thrust bearing. The bevel gear is disposed on one side of the bevel gear and is adapted to be driven by the bevel gear. The bevel gear also includes a pinion shaft disposed along its axial direction and a bushing for accommodating the pinion shaft. The housing has an opening on its side, and the pinion shaft and bushing partially extend out of the opening. The torsion handle is connected to the portion of the pinion shaft that extends out of the opening.

[0009] In another specific embodiment of this utility model, the sealing ring is a rubber ring.

[0010] In another specific embodiment of this utility model, the gasket is configured as an annular elastic gasket.

[0011] This utility model, by adopting the above-mentioned structure and adding rubber rings and gaskets, eliminates the gaps between the top assembly and outer sleeve of the screw jack, as well as between the thrust bearing and the base. This solves the problem of abnormal noise caused by the gaps in the jack. The structure is simple, the improvement cost is low, and it can protect the jack components and extend their service life. Attached Figure Description

[0012] Figure 1This is a cross-sectional view of the present invention along its height direction; Figure 2 This is a perspective view of the present utility model; Figure 3 This is a schematic diagram of the structure of the gasket described in this utility model; Figure 4 This is a schematic diagram of the sealing ring described in this utility model.

[0013] In the diagram: 1. Base; 11. Bearing cavity; 2. Outer sleeve; 3. Housing; 4. Guide tube; 5. Thrust bearing; 6. Gear assembly; 61. Large bevel gear; 62. Small bevel gear; 621. Small gear shaft; 622. Bushing; 63. Torque handle; 7. Screw assembly; 71. Push rod; 72. Large lead screw; 73. Small lead screw; 8. Top assembly; 81. Top pin; 811. Step; 82. Top support plate; 9. Gasket; 10. Sealing ring. Detailed Implementation

[0014] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings. However, the description of the embodiments is not a limitation on the technical solution. Any formal but not substantive changes made based on the concept of this utility model should be considered within the protection scope of this utility model.

[0015] In the following description, all directional (or orientational) concepts involving up, down, left, right, front, and back refer to the position of the figure being described, and are intended to facilitate public understanding. Therefore, they should not be construed as a special limitation on the technical solution provided by this utility model.

[0016] Please see Figure 1 and Figure 2 This utility model relates to an anti-noise structure for a screw jack, including a base 1, an outer sleeve 2 with openings at both ends, a shell 3 connecting the base 1 and the outer sleeve 2, a guide tube 4 fitted inside the outer sleeve 2, a thrust bearing 5 adapted to and installed in the bearing cavity 11 inside the base 1, a gear assembly 6 adapted to and connected to the thrust bearing 5, a screw pair assembly 7 driven by the gear assembly 6 to make linear motion, and a top assembly 8 disposed on the top of the screw pair assembly 7.

[0017] The gear assembly 6 includes a large bevel gear 61, a small bevel gear 62, and a torsion handle 63. The large bevel gear 61 is positioned above the thrust bearing 5, which is a pressure bearing, and its upper end is fixed to the large bevel gear 61. The small bevel gear 62 is positioned on one side of the large bevel gear 61 and is adapted to drive the large bevel gear 61. The small bevel gear 62 also includes a small gear shaft 621 arranged along its axial direction and a bushing 622 for accommodating the small gear shaft 621. The housing 3 has an opening on its side, through which the small gear shaft 621 and bushing 622 partially extend. The torsion handle 63 is connected to the portion of the small gear shaft 621 that extends out of the opening. The user drives the small bevel gear 62 by rotating the torsion handle 63, and the small bevel gear 62 drives the large bevel gear 61 to move through meshing.

[0018] The spiral assembly 7 includes a push rod 71, a large lead screw 72, and a small lead screw 73 arranged sequentially from the outside to the inside within the guide tube 4. The bottom of the small lead screw 73 is connected to the center hole of a square shaft and a bevel gear 61. The external thread of the small lead screw 73 and the internal thread of the large lead screw 72 form a primary threaded pair. The external thread at the bottom of the large lead screw 72 and the internal thread of the push rod 71 form a secondary threaded pair.

[0019] The top assembly 8 is disposed on the top of the top rod 71 and includes a top pin 81 and a top support plate 82. The top support plate 82 is configured as a cylindrical structure with openings at both ends. The bottom of the top pin 81 is extended with a step 811, which is installed and positioned to limit the upper opening of the top support plate 82. The top support plate 82 is sleeved on the top of the top rod 71 and is interference-fitted with the top rod 71.

[0020] Please see Figure 3 and Figure 4 and combined Figure 1 The improvement of this utility model is that it also includes a gasket 9 and a sealing ring 10. The sealing ring 10 is preferably a rubber ring, which is arranged around the large lead screw 72 to fill the gap between the bottom end of the top support plate 82 and the top end of the outer sleeve 2.

[0021] The gasket 9 is preferably an annular rubber gasket, which is disposed in the bearing cavity 11 and located below the thrust bearing 5.

[0022] When the screw jack needs to be stored and transported, and the jack assembly 8 is in a low position, the reverse torque handle 63 reverses the small conical gear 62, causing the large conical gear 61 to rotate in the opposite direction. At this time, the small lead screw 73 reverses, causing the large lead screw 72, the push rod 71, and the jack assembly 8 to move downwards until the jack support plate 82 is pressed down to the sealing ring 10 and stops moving downwards. Then, the reverse torque handle 63 continues to rotate, causing the small lead screw 73 to rise along the large lead screw 72, and also causing the large conical gear 61 and the thrust bearing 5 to rise. At this time, the gasket 9 will spring back upwards and continue to press against the bottom of the thrust bearing 5, thereby eliminating the gap between the thrust bearing 5 and the bearing cavity 11. At this time, the screw assembly 7, the guide tube 4, and the outer sleeve 2 also form a tight fit, thus eliminating the gap between these parts. After the gaps mentioned above are eliminated, the abnormal noise problem is also resolved.

[0023] When the screw jack starts to lift, the torsion handle 63 is rotated forward, and the conical pinion 62 drives the conical gear 61 to rotate forward. At this time, the small lead screw 73 rotates forward and moves downward along the large lead screw 72. The thrust bearing 5 and the conical gear 61 continue to move downward against the elastic force of the shim 9 until they are re-accommodated in the bearing cavity 11. Then, the torsion handle 63 is rotated forward again, and the push rod 71 is lifted, lifting the load.

Claims

1. A noise-proof structure for a screw jack, comprising a base (1), an outer sleeve (2) with openings at both ends, a housing (3) connecting the base (1) and the outer sleeve (2), a guide tube (4) fitted inside the outer sleeve (2), a thrust bearing (5) adapted to and installed in a bearing cavity (11) within the base (1), a gear assembly (6) adapted to and connected to the thrust bearing (5), a screw pair assembly (7) driven by the gear assembly (6), and a top assembly (8) disposed on top of the screw pair assembly (7), wherein the screw pair assembly (7) comprises a top rod (71), a large lead screw (72), and a small lead screw (73) arranged sequentially from the outside to the inside within the guide tube (4), the bottom of the small lead screw (73) is connected to the gear assembly (6), the small lead screw (73) and the large lead screw (72) form a primary threaded pair, the large lead screw (72) and the top rod (71) form a secondary threaded pair, and the top assembly (8) is disposed on top of the top rod (71), characterized in that: The noise prevention structure also includes a gasket (9) and a sealing ring (10). The gasket (9) is disposed in the bearing cavity (11) and located below the thrust bearing (5). The sealing ring (10) is disposed around the lead screw (72) to fill the gap between the top assembly (8) and the outer sleeve (2).

2. The anti-noise structure of the screw jack according to claim 1, characterized in that: The top assembly (8) includes a top pin (81) and a top support plate (82). The top support plate (82) is a cylindrical structure with openings at both ends. The bottom of the top pin (81) is extended with a step (811). The step (811) is installed with the upper opening of the top support plate (82) for limiting. The top support plate (82) is sleeved on the top of the top rod (71) and is interference-fitted with the top rod (71). The sealing ring (10) is set between the bottom end of the top support plate (82) and the top end of the outer sleeve (2).

3. The anti-noise structure of the screw jack according to claim 1, characterized in that: The gear assembly (6) includes a bevel gear (61), a bevel gear (62), and a torsion handle (63). The bevel gear (61) is positioned above the thrust bearing (5) and is adapted to be installed with the thrust bearing (5). The bevel gear (62) is positioned on one side of the bevel gear (61) and is adapted to be driven by the bevel gear (61). The bevel gear (62) also includes a pinion shaft (621) arranged along its axial direction and a bushing (622) for accommodating the pinion shaft (621). The housing (3) has an opening on its side. The pinion shaft (621) and the bushing (622) partially extend out of the opening. The torsion handle (63) is connected to the portion of the pinion shaft (621) that extends out of the opening.

4. The anti-noise structure of the screw jack according to claim 1, characterized in that: The sealing ring (10) is a rubber ring.

5. The anti-noise structure of the screw jack according to claim 1, characterized in that: The gasket (9) is configured as an annular elastic pad.

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