A compact hydraulic coupling

Abstract

The utility model discloses a compact type hydraulic coupling relates to mechanical drive technical field, and the purpose is to make the compact structure of coupling, and the following technical scheme is proposed: including support axle and the expansion sleeve and the retaining sleeve of setting respectively in the expansion sleeve outside of support axle, be equipped with the oil port on the expansion sleeve, be equipped with the oil chamber in the inner wall of expansion sleeve, and the oil port is connected with the oil chamber, and the expansion sleeve outside sets the shear pipe, and the concave structure of retaining sleeve is equipped with shear pipe installation groove, and the part of shear pipe is in shear pipe installation groove, and the outer peripheral surface of shear pipe and the inboard groove wall of shear pipe installation groove have the clearance in the circumference between, the expansion sleeve sets in the concave groove of concave structure, the radial elastic deformation is produced under the action of oil pressure to the oil chamber, and the outer wall of expansion sleeve and expansion sleeve inner wall of expansion sleeve containing end all are with the inner wall interference fit of concave groove. The utility model discloses compact structure, and has high torque transmission, error compensation, overload protection and the advantages such as convenient maintenance, is a kind of efficient economic drive scheme.

Description

Technical Field

[0001] This utility model relates to the field of mechanical transmission technology, specifically to a compact hydraulic coupling. Background Technology

[0002] Compact hydraulic couplings, as an important mechanical transmission component, play a vital role in industrial production and are mainly used in heavy machinery and equipment under high load and high impact conditions, such as metallurgy, mining, petroleum, chemical industry and wind power.

[0003] Utility model patent CN203500321 U discloses a "Novel Hydraulic Safety Coupling," which includes a shear ring, a connecting sleeve, and a shear tube assembly. The shear ring consists of two symmetrical parts, with several connecting holes evenly distributed on the outer diameter of its left end and several openings evenly distributed on the outer diameter of its right end. The shear ring is fitted onto the outer wall of the connecting sleeve and is connected to the connecting sleeve as a whole through the shear tube assembly located within the openings. During assembly, the inner walls of the shear ring and the connecting sleeve are respectively fitted onto the two outer diameters of the mandrel, with the upper and lower parts of the shear ring fitted onto the mandrel. Then, the position of the openings of the shear ring is adjusted so that the shear tube assembly is located within the openings, and it is connected and secured to the mandrel by connecting screws installed in the connecting holes. Thus, when the shear ring needs to be replaced, it can be easily installed or disassembled simply by loosening and removing the connecting screws, without disassembling other parts, improving user efficiency and appropriately reducing operating costs. However, this technology has the following shortcomings:

[0004] There is only one mating surface between the coupling sleeve and the shaft core to transmit torque. However, this connection method requires an excessively large coupling to achieve the required torque transmission. A large coupling increases the length of the main drive shaft, resulting in a large overall weight and excessive moment of inertia in the drive shaft system, leading to increased operating energy consumption. Utility Model Content

[0005] The purpose of this invention is to provide a compact hydraulic coupling with a compact structure to reduce the overall weight and operating energy consumption of the main drive shaft system.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:

[0007] A compact hydraulic coupling includes a support shaft and an expansion sleeve and a retaining sleeve respectively sleeved on the support shaft. The expansion sleeve has an oil inlet and an oil cavity in its inner wall, with the oil inlet communicating with the oil cavity. The retaining sleeve is a concave structure with one open end. A shear tube is provided on the outer side of the expansion sleeve near the retaining sleeve. The end of the concave structure near the expansion sleeve has a shear tube mounting groove. A portion of the shear tube is radially located in the shear tube mounting groove, and there is a circumferential gap between the outer circumferential surface of the shear tube and the inner wall of the shear tube mounting groove. The open end of the concave structure has a concave groove along the axial direction, and the receiving end of the expansion sleeve is located in the concave groove.

[0008] Under the action of oil pressure, the oil cavity undergoes radial elastic deformation, and the outer wall and inner wall of the expansion sleeve at the receiving end of the expansion sleeve are both interference-fitted with the inner wall of the concave groove.

[0009] Furthermore, a cylindrical roller bearing is provided between the expansion sleeve and the retaining sleeve, and a tapered roller bearing is provided between the support shaft and the expansion sleeve.

[0010] Furthermore, the support shaft is provided with a shoulder for positioning the inner ring of the tapered roller bearing.

[0011] Furthermore, the open end of the support shaft is provided with an end cap for sealing, and the open end of the expansion sleeve is provided with a suffix for sealing.

[0012] Furthermore, a protective cover is fixedly installed on the side end of the retaining sleeve, and the protective cover covers the outside of the shear tube.

[0013] This utility model has the following beneficial effects:

[0014] This compact hydraulic coupling solution utilizes the principle of hydraulic expansion, enabling the expansion sleeve to simultaneously form a uniform interference fit with both the support shaft and the retaining sleeve. This not only transmits extremely high torque but also automatically compensates for installation alignment errors, reducing machining and assembly requirements. Furthermore, its integrated design achieves advantages in high performance, high reliability, and convenient maintenance. Its highly compact structure, coaxially integrating all functional components, significantly saves installation space, reduces overall weight and operating energy consumption, making it particularly suitable for heavy equipment in space-constrained environments.

[0015] The shear tube, acting as a "mechanical fuse," cuts off power in case of overload, effectively protecting core equipment. Meanwhile, the combination of cylindrical and tapered roller bearings allows it to withstand both radial and axial loads, ensuring the rigidity and smooth operation of the transmission system.

[0016] Traditional interference fit installation and disassembly are extremely difficult, while this solution allows for locking and unlocking of the expansion sleeve simply by adding oil and depressurizing, simplifying operation and significantly reducing maintenance costs and downtime. Furthermore, the design of the end cap, end cap, and protective cover effectively prevents dust and water damage and protects vulnerable safety components. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of the compact hydraulic coupling of this utility model;

[0018] Figure 2 This is a schematic diagram of the assembly structure of the compact hydraulic coupling of this utility model.

[0019] Figures 1 to 2 The reference numerals in the attached drawings are respectively: oil inlet 1, shear tube 2, support shaft 3, expansion sleeve 4, protective cover 5, retaining sleeve 6, oil cavity 7, end cap 8, end cap 9, shear tube mounting groove 10, shaft shoulder 13, outer wall of expansion sleeve 14, inner wall of expansion sleeve 15, cylindrical roller bearing 16, tapered roller bearing 17. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0021] Please refer to Figure 1-2 A compact hydraulic coupling includes a support shaft 3 and an expansion sleeve 4 and a retaining sleeve 6 respectively sleeved on the support shaft 3. The expansion sleeve 4 is provided with an oil inlet 1 and an oil cavity 7 in its inner wall. The retaining sleeve 6 is a concave structure with one open end. A shear tube 2 is provided on the outer side of the expansion sleeve 4 near the retaining sleeve 6. A shear tube mounting groove 10 is provided at the end of the concave structure near the expansion sleeve 4. A part of the shear tube 2 is radially located in the shear tube mounting groove 10, and there is a circumferential gap between the outer circumferential surface of the shear tube 2 and the inner wall of the shear tube mounting groove 10. A concave groove is provided axially at the open end of the concave structure, and the receiving end of the expansion sleeve 4 is located in the concave groove. The oil cavity 7 undergoes radial elastic deformation under the action of oil pressure. The outer wall 14 and the inner wall 15 of the expansion sleeve at the receiving end of the expansion sleeve 4 are both interference-fitted with the inner wall of the concave groove.

[0022] This embodiment describes in detail that the support shaft 3, as the core load-bearing component of the entire coupling, possesses sufficient strength and toughness to transmit torque and withstand various loads. The specific dimensions of the support shaft 3 can be designed according to the power, torque, and space constraints of the transmission system in which it is applied.

[0023] The expansion sleeve 4 is fitted onto the outside of the support shaft 3. The expansion sleeve 4 is capable of controlled radial elastic deformation under hydraulic pressure. The expansion sleeve 4 has an oil inlet 1, which is preferably a standard threaded interface for easy connection to an external hydraulic pump or oil injection tool. Inside the expansion sleeve 4, there is an oil cavity 7 surrounding its inner wall. This oil cavity 7 can be a continuous annular cavity or composed of multiple interconnected local cavities. The oil inlet 1 communicates with the oil cavity 7 through an oil passage, allowing high-pressure oil to be injected and fill the oil cavity 7.

[0024] The oil cavity 7 is constructed as follows: when high-pressure oil is injected into it through the oil inlet 1, the oil pressure acts on the wall of the oil cavity 7, forcing the expansion sleeve 4 to undergo radial outward elastic expansion deformation. This deformation is controllable and reversible. When the oil pressure is released, the expansion sleeve 4 can basically return to its original shape under the elasticity of its own material.

[0025] On the outer side of the expansion sleeve 4, near the retaining sleeve 6, a shear tube 2 is provided. This shear tube 2 serves as an overload protection device. Its material strength and structure are designed so that when the torque is excessive and the expansion sleeve 4 and retaining sleeve 6 slide circumferentially relative, the shear tube 2 is sheared by the inner wall of the shear tube mounting groove 10. High-pressure oil in the oil chamber 7 is then rapidly ejected from the shear tube 2, thus unloading the load. The assembly mating surface returns to its clearance, and the torque unloading becomes zero, thereby interrupting power transmission and protecting the coupling and other transmission components from overload damage.

[0026] The retaining sleeve 6 is also fitted onto the outside of the support shaft 3 and arranged adjacent to the expansion sleeve 4. The retaining sleeve 6 is constructed as a concave structure with one end open, similar to a cup. Its sidewall has a concave groove along the axial direction, and the size of the concave groove is designed to accommodate the receiving end of the expansion sleeve 4.

[0027] In the initial installation state, the receiving end of the expansion sleeve 4 is inserted into the concave groove of the retaining sleeve 6. At this time, there may be a certain gap or a slight transition fit between the outer wall of the expansion sleeve 4 and the inner wall of the concave groove, and between the inner wall of the expansion sleeve 4 and the inner wall of the concave groove. When high-pressure oil is injected into the oil chamber 7 through the oil inlet 1, the expansion sleeve 4 expands radially. As a result, an interference fit is formed between the outer wall 14 of the expansion sleeve and the inner wall of the concave groove, and between the inner wall 15 of the expansion sleeve and the inner wall of the concave groove. This interference fit generates normal pressure and the resulting friction, which can reliably transmit torque and axial force. By precisely controlling the pressure of the injected oil, the interference amount can be precisely controlled to achieve the best transmission effect. A large portion of the inner and outer walls of the expansion sleeve 4 and the inner wall of the concave groove form contact surfaces, that is, torque is transmitted through multiple mating surfaces. This arrangement can significantly reduce the volume of the overall structure, thereby reducing the mass and operating energy consumption of the transmission system.

[0028] Furthermore, a cylindrical roller bearing 16 is provided between the expansion sleeve 4 and the retaining sleeve 6, and a tapered roller bearing 17 is provided between the support shaft 3 and the expansion sleeve 4.

[0029] To optimize the mechanical properties and assembly relationship of the coupling and prevent wear failure of the mating surfaces of the expansion sleeve 4 and the retaining sleeve 6, a cylindrical roller bearing 16 is installed between the expansion sleeve 4 and the retaining sleeve 6. This cylindrical roller bearing 16 primarily bears radial loads and allows for relative micro-movement or alignment adjustment between the expansion sleeve 4 and the retaining sleeve 6 in a specific direction, while reducing friction between them. The inner and outer rings of the cylindrical roller bearing 16 are respectively fitted with the outer surface of the expansion sleeve 4 and the inner wall of the concave groove of the retaining sleeve 6 in an appropriate manner, such as an interference fit or a clearance fit, depending on the design requirements.

[0030] A tapered roller bearing 17 is provided between the support shaft 3 and the expansion sleeve 4. The tapered roller bearing 17 can simultaneously withstand radial and axial loads, preventing contact wear failure of the mating surfaces of the support shaft 3 and the expansion sleeve 4, and providing stable relative rotational support for the support shaft 3 and the expansion sleeve 4. Its inner and outer rings respectively mate with the outer surface of the support shaft 3 and the inner wall of the expansion sleeve 4 in an appropriate manner.

[0031] Furthermore, the support shaft 3 is provided with a shoulder 13 for positioning the inner ring of the tapered roller bearing 17. To accurately position the tapered roller bearing 17, a shoulder 13 is machined onto the support shaft 3. This shoulder 13 contacts the end face of the inner ring of the tapered roller bearing 17, thereby axially defining the position of the bearing's inner ring and preventing axial movement during operation.

[0032] Furthermore, the open end of the support shaft 3 is provided with an end cap 9 for sealing, and the open end of the expansion sleeve 4 is provided with a sealing cap 8 for sealing. To seal the internal space of the coupling, prevent the intrusion of external contaminants (such as dust and moisture), and prevent internal lubricant leakage, an end cap 9 is provided at the open end of the support shaft 3. This end cap 9 can be installed at the end of the support shaft 3 by bolt connection, snap ring fixation, or other suitable means. Similarly, a sealing cap 8 is provided at the open end of the expansion sleeve 4, and its function is similar to that of the end cap 9, for sealing the end opening of the expansion sleeve 4. The sealing cap 8 can also be fixed by bolt connection or other sealing cap structures. Sealing elements, such as O-rings or gaskets, can be provided on both the end cap 9 and the sealing cap 8 to enhance the sealing effect.

[0033] Furthermore, a protective cover 5 is fixedly installed on the side end of the retaining sleeve 6 near the tightening sleeve 4, covering the outside of the shearing tube 2. To protect the shearing tube 2 from external impacts or environmental factors, and to prevent high-pressure oil from spraying out through the shearing tube 2 and causing safety hazards, a protective cover 5 is fixedly installed on the side end of the retaining sleeve 6. This protective cover 5 is designed to cover the outside of the shearing tube 2, forming a protective shell. The protective cover 5 is detachably installed on the retaining sleeve 6 using screws, clips, etc. When the transmission torque is overloaded and the shearing tube 2 is cut, it can effectively prevent high-pressure oil from spraying out at high speed after the shearing tube 2 is cut, thus preventing a safety accident.

[0034] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A compact hydraulic coupling, characterized in that, The device includes a support shaft (3) and an expansion sleeve (4) and a retaining sleeve (6) respectively sleeved on the support shaft (3). The expansion sleeve (4) is provided with an oil inlet (1) and an oil cavity (7) is provided in the inner wall of the expansion sleeve (4). The oil inlet (1) is connected to the oil cavity (7). The retaining sleeve (6) is a concave structure with one end open. A shear tube (2) is provided on the outer side of the expansion sleeve (4) near the retaining sleeve (6). The end of the concave structure near the expansion sleeve (4) is provided with a shear tube mounting groove (10). A part of the shear tube (2) is radially located in the shear tube mounting groove (10), and there is a gap in the circumferential direction between the outer circumferential surface of the shear tube (2) and the inner groove wall of the shear tube mounting groove (10). The open end of the concave structure is provided with a concave groove along the axial direction, and the receiving end of the expansion sleeve (4) is provided in the concave groove. The oil cavity (7) undergoes radial elastic deformation under oil pressure. The outer wall (14) and inner wall (15) of the expansion sleeve (4) at the receiving end are both interference-fitted with the inner wall of the concave groove.

2. The compact hydraulic coupling according to claim 1, characterized in that, A cylindrical roller bearing (16) is provided between the expansion sleeve (4) and the retaining sleeve (6), and a tapered roller bearing (17) is provided between the support shaft (3) and the expansion sleeve (4).

3. The compact hydraulic coupling according to claim 2, characterized in that, The support shaft (3) is provided with a shoulder (13) for positioning the inner ring of the tapered roller bearing (17).

4. The compact hydraulic coupling according to claim 1, characterized in that, The open end of the support shaft (3) is provided with an end cap (9) for closing, and the open end of the expansion sleeve (4) is provided with a cap (8) for closing.

5. The compact hydraulic coupling according to claim 1, characterized in that, A protective cover (5) is fixedly provided on the side end of the retaining sleeve (6) near the tightening sleeve (4), and the protective cover (5) covers the outside of the shear tube (2).

Images