Built-in type winch spline transmission connection structure

Abstract

The utility model discloses a built-in winch spline transmission connection structure which comprises a speed reducer and a winding drum, the speed reducer is built in an inner cavity of the winding drum, an outer spline is arranged on the outer wall of the speed reducer, an inner spline is arranged on the inner wall of the winding drum, the inner spline is directly formed on the wall thickness of the winding drum, and the inner spline is arranged on the inner wall of the winding drum. The outer spline and the inner spline are meshed to form a power transmission pair, and the working torque of the winch is transmitted to the winding drum through the speed reducer through mechanical meshing on the side faces of the spline teeth. According to the built-in spline transmission connection structure of the winch, the risks of loosening and breaking of the bolts are eliminated, and the problem that the arrangement space of the bolts is limited by the diameter of the winding drum is solved.

Description

Technical Field

[0001] This utility model relates to the technical field of built-in winches, and in particular to a spline drive connection structure for a built-in winch. Background Technology

[0002] The core advantages of the built-in winch structure lie in its high degree of integration and compact size. To achieve this goal, the reducer 1... ’ Output flange and drum 2 ’ The connection generally uses bolts 3 ’ In direct rigid connection schemes, the core torsion transmission mechanism is pure friction torsion transmission, relying on bolts 3 ’ The applied huge preload force causes the reducer 1 ’ Output flange and drum 2 ’ A strong normal pressure is generated between the connecting surfaces, which in turn generates static friction to transmit the working torque. However, this seemingly simple connection method faces two significant challenges in practical applications:

[0003] 1. Bolts under long-term operation 3 ’ Risk of loosening and breakage: The continuous vibration generated by the operation of the winch is a major risk factor for bolt 3. ’ The main factor causing loosening is that the bolts are subjected to high alternating stress. ’ Insufficient design margin or stress concentration can easily lead to fatigue fracture.

[0004] II. Roll 2 ’ The diameter of the bolt 3 ’ Space constraints for layout: distance from bolt hole center to reducer 1 ’ The edge of the output flange and to the drum 2 ’ The structural edges must meet minimum edge distance requirements to ensure connection strength and prevent edge tearing. (Roll 2) ’ The smaller the diameter, the more stringent this constraint becomes. Utility Model Content

[0005] The technical problem to be solved by this utility model is: in order to overcome the shortcomings of the existing technology, a built-in winch spline transmission reducer structure is provided, which not only eliminates the risk of bolt loosening and breakage, but also eliminates the problem of the drum diameter restricting the space for bolt arrangement.

[0006] The technical solution adopted by this utility model to solve its technical problem is: a built-in winch spline transmission reducer structure, including a reducer and a drum. The reducer is built into the internal cavity of the drum. An external spline is provided on the outer wall of the reducer, and an internal spline is provided on the inner wall of the drum. The internal spline is directly formed on the wall thickness of the drum. The external spline and the internal spline mesh to form a power transmission pair. The working torque of the winch is transmitted from the reducer to the drum through the mechanical meshing of the spline teeth side.

[0007] To be further specific, the external spline described in this utility model is an involute spline or a rectangular spline.

[0008] To be further specific, the present invention provides a limiting mechanism between the reducer and the drum for constraining the axial displacement of the power transmission pair.

[0009] To be further specific, the limiting mechanism of this utility model includes an end cap, an elastic washer, and a retaining ring groove. The retaining ring groove is disposed on the outer wall of the reducer, the elastic washer is engaged in the retaining ring groove, the end cap is disposed on the end face of the drum, and the end cap presses against the elastic washer.

[0010] To be further specific, the end of the drum described in this utility model is integrated with a lubrication and sealing structure.

[0011] To be further specific, the lubrication and sealing structure of this utility model includes a radial oil injection hole, an axial oil guide groove, and a double-lip rotary seal ring. The radial oil injection hole is opened on the end cover, the axial oil guide groove is distributed circumferentially along the tooth groove of the inner spline, and the double-lip rotary seal ring is disposed at the shoulder of the outer spline.

[0012] The beneficial effects of this utility model are as follows: This utility model's built-in winch spline transmission reducer structure innovatively changes the connection method between the reducer and the drum from bolt friction torque transmission to spline meshing torque transmission, achieving two major breakthroughs: First, it revolutionarily reduces the drum diameter, breaking through space limitations and reducing material costs; second, it fundamentally improves torque transmission reliability, completely eliminating the failure risk caused by bolt loosening and shear fracture. It provides an efficient and reliable technical path to solve the long-standing contradiction between structural compactness and torque transmission reliability in built-in winches, and has significant engineering application value and market competitiveness. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the structure of a traditional built-in winch reducer;

[0015] Figure 2 yes Figure 1 Enlarged view of point A in the image.

[0016] Figure 1-2 The number in is: 1 ’ 1. Gearbox; 2. ’ 1. Roll; 3. ’ ,bolt.

[0017] Figure 3 This is a schematic diagram of the structure of this utility model;

[0018] Figure 4 yes Figure 3 Enlarged view of point B in the image.

[0019] Figure 3-4 The labels in the text are: 1. speed reducer; 2. drum; 3. external spline; 4. internal spline. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] like Figure 3-4 The structure shown is a built-in winch spline drive reducer, including a reducer 1 and a drum 2. The reducer 1 is built into the internal cavity of the drum 2. An external spline 3 is provided on the outer wall of the reducer 1, and an internal spline 4 is provided on the inner wall of the drum 2. The internal spline 4 is directly formed on the wall thickness of the drum 2. The external spline 3 and the internal spline 4 mesh to form a power transmission pair. The working torque of the winch is transmitted from the reducer 1 to the drum 2 through the mechanical meshing of the spline teeth side.

[0022] Preferably, the external spline 3 is an involute spline or a rectangular spline. When the external spline 3 is an involute spline, the internal spline 4 is also an involute spline with the same parameters. The involute tooth profile has self-centering characteristics during meshing, and radial automatic self-alignment is achieved by continuous contact of the tooth surfaces, compensating for the installation coaxiality deviation between the reducer 1 and the inner wall of the drum 2, avoiding wear due to eccentricity, and extending the spline life. When the external spline 3 is a rectangular spline, the internal spline 4 is also a rectangular spline with the same parameters. The rectangular spline transmits torque by the tooth side, has a large tooth height and a large contact area. Under the same pitch circle diameter, the rectangular spline has fewer teeth and a larger tooth thickness, which is suitable for scenarios where the wall thickness of the drum 2 is limited, and avoids weakening the drum body strength due to an excessively small tooth root circle.

[0023] Preferably, a limiting mechanism is provided between the reducer 1 and the drum 2 to constrain the axial displacement of the power transmission pair. The setting of the limiting mechanism is an important design to ensure the reliability of the spline transmission system. Specifically, the limiting mechanism includes an end cap, an elastic washer, and a retaining ring groove. The retaining ring groove is set on the outer wall of the reducer 1, the elastic washer is engaged in the retaining ring groove, the end cap is set on the end face of the drum 2, and the end cap presses against the elastic washer. The elastic washer is a wave spring washer.

[0024] Preferably, the end of the drum 2 is integrated with a lubrication sealing structure. The design of the lubrication sealing structure can ensure long-term lubrication of the spline meshing area and prevent impurities from entering. Specifically, the lubrication sealing structure includes a radial oil injection hole, an axial guide oil groove, and a double-lip rotary seal ring. The radial oil injection hole is opened on the end cover, the axial guide oil groove is distributed circumferentially along the tooth groove of the inner spline 4, and the double-lip rotary seal ring is set at the shoulder of the outer spline 3.

[0025] This built-in winch spline-driven reducer structure innovatively changes the connection between the reducer 1 and the drum 2 from bolt friction torque transmission to spline meshing torque transmission. Specifically, the original output flange of the reducer 1 is replaced with an external spline 3, and the inner wall of the drum 2 is made into an internal spline 4. The external spline 3 and internal spline 4 connect to transmit torque, ensuring strength while saving on the diameter of the drum 2. This achieves two major breakthroughs: First, it revolutionarily reduces the diameter of the drum 2, overcoming space limitations, reducing material costs, and effectively preventing the reducer 1 from being unable to be installed inside the drum 2 when the diameter is limited. Second, it fundamentally improves torque transmission reliability. By using splines to transmit torque, it completely eliminates the failure risk caused by bolt loosening and shear fracture. This provides an efficient and reliable technical path to solve the long-standing contradiction between structural compactness and torque transmission reliability in built-in winches, possessing significant engineering application value and market competitiveness.

[0026] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A built-in spline drive connection structure for a winch, characterized in that: The device includes a speed reducer (1) and a drum (2). The speed reducer (1) is housed in the internal cavity of the drum (2). An external spline (3) is provided on the outer wall of the speed reducer (1), and an internal spline (4) is provided on the inner wall of the drum (2). The internal spline (4) is directly formed on the wall thickness of the drum (2). The external spline (3) and the internal spline (4) mesh to form a power transmission pair. The working torque of the winch is transmitted from the speed reducer (1) to the drum (2) through the mechanical meshing of the spline teeth.

2. The built-in winch spline drive connection structure according to claim 1, characterized in that: The external spline (3) is an involute spline or a rectangular spline.

3. The built-in winch spline drive connection structure according to claim 1, characterized in that: A limiting mechanism for constraining the axial displacement of the power transmission pair is provided between the reducer (1) and the drum (2).

4. The built-in winch spline drive connection structure according to claim 3, characterized in that: The limiting mechanism includes an end cap, an elastic washer, and a retaining ring groove. The retaining ring groove is disposed on the outer wall of the reducer (1), the elastic washer is engaged in the retaining ring groove, the end cap is disposed on the end face of the drum (2), and the end cap presses against the elastic washer.

5. The built-in winch spline drive connection structure according to claim 4, characterized in that: The end of the reel (2) is integrated with a lubrication and sealing structure.

6. The built-in winch spline drive connection structure according to claim 5, characterized in that: The lubrication and sealing structure includes a radial oil injection hole, an axial guide oil groove, and a double-lip rotary seal ring. The radial oil injection hole is opened on the end cover. The axial guide oil groove is distributed circumferentially along the tooth groove of the inner spline (4). The double-lip rotary seal ring is located at the shoulder of the outer spline (3).

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