Bellows crowned tooth type cardan shaft coupling

Abstract

The utility model discloses a corrugated pipe crowned tooth type universal shaft coupling, and belongs to the field of universal transmission shafts. The corrugated pipe crowned tooth type cardan shaft coupling comprises a transmission shaft and tooth type couplings arranged at the two ends of the transmission shaft, each tooth type coupling comprises an inner tooth sleeve, an outer tooth sleeve, a corrugated pipe and a sealing cover, the outer tooth sleeves are installed in the inner tooth sleeves in a meshed mode, and the shaft head part of the transmission shaft is connected with the outer tooth sleeves. One end of the corrugated pipe is in sealed connection with the outer gear sleeve, and the other end of the corrugated pipe is in sealed connection with the side, close to the transmission shaft, of the inner gear sleeve. According to the universal shaft, the transmission shaft is organically combined with the tooth type couplings at the two ends, the transmission efficiency is improved, the service life is long, transmission is stable and reliable, installation and maintenance are convenient, and the maintenance cost of an existing universal shaft is reduced. In addition, through the structural optimization design of the tooth type coupling, the angular displacement compensation amount of the tooth type coupling is improved, and therefore the tooth type coupling can be applied to occasions with large deviation.

Description

TECHNICAL FIELD

[0001] The utility model relates to a universal shaft more specifically, relate to a corrugated pipe drum gear type universal shaft coupling. BACKGROUND

[0002] In the traction transmission device of electric locomotive and swing train, traction motor is the power source, and the torque generated thereby needs to be effectively transmitted to the wheel set to drive the vehicle to move forward. The universal shaft can adapt to the relative displacement and angle change between the motor output shaft and the wheel set shaft. It is mainly composed of universal joint, transmission shaft and intermediate support, and these devices are specially set for the continuous change of relative position in the working process. For example, during the operation of the vehicle, due to the unevenness of the track, the turning of the vehicle and other factors, the positional relationship between the motor shaft and the wheel set shaft is not fixed. The universal shaft can flexibly transmit power within a certain angle range, ensuring that the power of the motor can be reliably transmitted to the wheel set, so that the vehicle can operate normally.

[0003] However, the existing universal shaft has the following shortcomings:

[0004] 1) relatively low transmission efficiency

[0005] Due to the structural characteristics of the universal shaft, a certain amount of energy loss will occur during power transmission. Compared with some direct rigid connection transmission modes (such as rigid connection of couplings), the transmission efficiency of the universal shaft is relatively low. This is mainly because when compensating for the angle and displacement changes, friction and sliding will occur between the internal movable parts (such as cross shaft, ball cage, etc.), thereby consuming part of the energy.

[0006] Especially in high-speed and high-torque working conditions, energy loss may be more obvious. For example, in the transmission system of a large industrial compressor, if a universal shaft is used for power transmission, its transmission efficiency may be several percentage points lower than that of a high-precision rigid coupling, which will increase certain energy consumption and operating costs.

[0007] 2) high maintenance cost

[0008] The structure of the universal shaft is relatively complex, and there are multiple movable parts inside, such as cross shaft, needle bearing, etc. in the cross shaft universal joint. These parts are prone to wear, fatigue and other problems after long-term use. For example, if the needle bearing of the cross shaft is not lubricated properly or bears too much load, it is easy to be damaged, such as bearing sleeve cracks, cross shaft bushing and needle bearing lubrication, cross shaft and wear pad wear, spline sleeve wear, gear box gear corrosion, etc. Regular inspection and maintenance are required.

[0009] Once the universal shaft fails, the maintenance process is relatively complex. Maintenance personnel need to have certain professional knowledge and skills, and when maintenance is needed, the equipment needs to be disassembled, parts replaced, etc. This will result in high maintenance cost and long maintenance time, affecting the normal use of the equipment.

[0010] The above problems of the existing universal shaft seriously restrict the stability and safety of the motor train unit. The bellows drum gear coupling has the advantages of high transmission efficiency, easy installation and maintenance, etc. If the bellows drum gear coupling can be applied to the above-mentioned universal shaft, it can make up for the shortcomings of the above-mentioned universal shaft and improve the transmission efficiency and maintenance convenience between the motor output shaft and the wheel pair shaft.

[0011] In addition, the allowable angular displacement compensation of the bellows drum gear coupling of the existing structure is small, and in the case of large axis deviation, it cannot transmit at a large angle like the universal shaft. Therefore, for occasions with large axis deviation, not only do we need to consider how to apply the drum gear coupling to the universal shaft, but also we need to improve the drum gear coupling to increase its angular displacement compensation, so as to develop a drum gear universal shaft coupling that has the advantages of large-angle transmission of the universal shaft and high-efficiency transmission of the bellows drum gear coupling. SUMMARY

[0012] 1. Technical problems to be solved by the utility model

[0013] One purpose of the utility model is to overcome the shortcomings of the existing universal shaft, such as low transmission efficiency and high maintenance cost, and provide a bellows drum gear universal shaft coupling. By combining the transmission shaft with the gear coupling at both ends, the gear coupling is used as the rotating joint of the universal shaft, which improves the transmission efficiency. The bellows gear coupling can be lubricated with lubricating oil, which has good lubrication effect, long service life, stable and reliable transmission, and is easy to install and maintain, thereby reducing the maintenance cost of the existing universal shaft.

[0014] Another purpose of the utility model is to provide a drum gear universal shaft coupling that has the advantages of large-angle transmission and high-efficiency transmission. Through the structural optimization design of the gear coupling, the angular displacement compensation is improved, so that it can be applied in large deviation occasions, widening the application range of the drum gear universal shaft coupling, which can be used in transmission structures such as direction shafts, especially suitable for electric locomotives and swing trains.

[0015] 2. Technical solutions

[0016] To achieve the above purpose, the technical solutions provided by the utility model are as follows:

[0017] The utility model discloses a bellows drum gear universal shaft coupling, including drive shaft and the toothed coupling of being arranged at the both ends of drive shaft, the toothed coupling includes inner tooth cover, outer tooth cover, bellows and sealing cover, the outer tooth cover is engaged in the inner tooth cover, the axle head portion of drive shaft is connected with outer tooth cover, one end of bellows is sealedly connected with outer tooth cover, and the other end is sealedly connected with the side of inner tooth cover close to drive shaft, and the sealing cover is located the side of inner tooth cover away from drive shaft.

[0018] Further, the outer periphery of the outer tooth cover has drum gears engaged with the inner tooth ring of the inner tooth cover, each of the drum gears has a concentric circular-arc tooth profile, and the center O of the circular-arc tooth profile is located on the axis of the outer tooth cover.

[0019] Further, the sealing cover has a concave cavity recessed away from the end face of the outer tooth cover to form a displacement compensation space L between the sealing cover and the outer tooth cover.

[0020] Further, the middle part of the outer tooth cover has a connecting sleeve connected with the axle head portion of the drive shaft, the outer side of the connecting sleeve has an annular cavity, the bellows is sleeved in the annular cavity, one end of the bellows is sealedly fixed in the groove bottom of the annular cavity through a compression ring, the side of the inner tooth cover close to the drive shaft is integrally provided with or separately installed with a rear end cover, the other end of the bellows is sealedly connected at the center hole of the rear end cover, the center hole of the rear end cover has a larger diameter than the outer diameter of the axle head portion of the drive shaft, and an annular angular displacement active space ΔD is formed between the center hole of the rear end cover and the axle head portion of the drive shaft.

[0021] Further, the inner side of the inner tooth cover away from the side of the rear end cover is further provided with a limiting part, and the outer periphery of the outer tooth cover close to the limiting part further has a toothless part.

[0022] Further, the side of the inner tooth cover away from the drive shaft further has an external flange.

[0023] Further, a sealing ring is further arranged between the sealing cover and the inner tooth cover; when the rear end cover is integrally formed on the inner tooth cover, the sealing cover is installed from the side of the inner tooth cover away from the drive shaft; when the rear end cover is separately installed on the inner tooth cover, the sealing cover can be installed in the inner tooth cover from the side of the rear end cover.

[0024] Further, the drive shaft includes an insulating tube and connecting shaft heads fixed at both ends of the insulating tube, and the connecting shaft heads are used for being connected with the outer tooth cover of the toothed coupling on the corresponding side.

[0025] Further, the end part of the connecting shaft head has a necked end head, and the root of the necked end head has an inner recessed transition arc surface.

[0026] Further, the insulating tube is a hollow tube, and the connecting shaft head has a through hole in communication with the insulating tube.

[0027] 3. Beneficial effects

[0028] Compared with the prior art, the technical scheme has the following beneficial effects:

[0029] (1) The bellows drum gear universal shaft coupling comprises a transmission shaft and gear couplings arranged at two ends of the transmission shaft, the gear couplings comprise inner tooth sleeves, outer tooth sleeves, bellows and sealing covers, the outer tooth sleeves are engagedly arranged in the inner tooth sleeves, the shaft head portion of the transmission shaft is connected with the outer tooth sleeves, one end of the bellows is sealingly connected with the outer tooth sleeve, the other end of the bellows is sealingly connected with the inner tooth sleeve on the side close to the transmission shaft, the sealing cover is arranged on the side of the inner tooth sleeve away from the transmission shaft, the sealing of the tooth-shaped lubricating medium is realized by the sealing cover and the bellows, the working stability of the gear coupling under the working condition of the universal shaft is ensured, the gear coupling is used as the rotating joint of the universal shaft, the transmission efficiency is improved, the bellows gear coupling can be lubricated by lubricating oil, the lubricating effect is good, the service life is long, the transmission is stable and reliable, the installation and maintenance are convenient, and the maintenance cost of the existing universal shaft is reduced.

[0030] (2) The outer periphery of the outer tooth sleeve of the bellows drum gear universal shaft coupling has drum-shaped teeth meshing with the inner tooth ring of the inner tooth sleeve, each drum-shaped tooth has a concentric circular-arc tooth profile, and the center O of the circular-arc tooth profile is located on the axis of the outer tooth sleeve, so that the outer tooth sleeve can swing in the inner tooth sleeve with the center O as the center at a large angle, the angular displacement compensation amount is improved, the application in a large deviation occasion is realized, the application range of the drum gear universal shaft coupling is widened, and the drum gear universal shaft coupling can be used in transmission structures such as a direction shaft.

[0031] (3) The sealing cover of the bellows drum gear universal shaft coupling has a recessed cavity recessed away from the end face of the outer tooth sleeve, so as to form a displacement compensation space L between the sealing cover and the outer tooth sleeve, the side of the inner tooth sleeve close to the transmission shaft is provided with a rear end cover, the center hole of the rear end cover has a larger diameter than the outer diameter of the shaft head portion of the transmission shaft, and an annular angular displacement movement space ΔD is formed between the center hole of the rear end cover and the shaft head portion of the transmission shaft, through the above structure optimization, the angular displacement compensation amount is further improved, and the universal shaft coupling can be driven at a large angle like the existing universal shaft.

[0032] (4) The utility model discloses a bellows drum gear type universal shaft coupling, the middle part of the outer gear sleeve has the connecting sleeve connected with the shaft head part of the transmission shaft, the outside of the connecting sleeve has annular cavity, the bellows is equipped in the annular cavity, one end of the bellows is fixed in the groove bottom of annular cavity through the gland seal, the inner gear sleeve is integrally provided or separately installed with the rear end cover on the side close to the transmission shaft, the other end of the bellows is sealingly connected at the central hole of the rear end cover, adopts the gear type coupling design, and the structure is more simple and compact, and it is convenient to install and maintain;

[0033] (5) The utility model discloses a bellows drum gear type universal shaft coupling, the inner side of the inner gear sleeve is provided with a limiting part away from the side of the rear end cover, and the outer periphery of the outer gear sleeve is provided with a gearless part close to the limiting part. The outer diameter of the gearless part is smaller than the outer diameter of the drum gear, which can effectively avoid other internal structures when the outer gear sleeve is axially deflected relative to the inner gear sleeve, thereby ensuring the maximum angular displacement compensation of the gear type coupling. The limiting part can limit the axial movement of the outer gear sleeve, ensuring the reliability of the transmission.

[0034] (6) The utility model discloses a bellows drum gear type universal shaft coupling, the inner gear sleeve is provided with an external flange away from the side of the transmission shaft, which facilitates the installation of the universal shaft coupling.

[0035] (7) The utility model discloses a bellows drum gear type universal shaft coupling, a sealing ring is further provided between the sealing cover and the inner gear sleeve. The sealing cover is easy to install and reliable in sealing. When the rear end cover is integrally formed on the inner gear sleeve, the sealing cover is installed on the side of the inner gear sleeve away from the transmission shaft. When the rear end cover is separately installed on the inner gear sleeve, the sealing cover can be installed in the inner gear sleeve from the side of the rear end cover. The sealing cover is flexible and convenient to install.

[0036] (8) The utility model discloses a bellows drum gear type universal shaft coupling, the transmission shaft includes an insulating tube and connecting shaft heads fixed on both ends of the insulating tube. The connecting shaft heads are used to connect with the outer gear sleeves of the gear type couplings on the corresponding sides. The transmission shaft realizes electrical insulation at both ends. When used in rail transit power transmission, it ensures the stable insulation between the driving side and the driven side, thereby ensuring the stability and safety of the motor train unit operation.

[0037] (9) The utility model discloses a bellows drum gear type universal shaft coupling, the end of the connecting shaft head has a necked end, and the root of the necked end has an inner concave transition arc surface. The necked end design ensures the overall strength of the transmission shaft, meets the working conditions of high speed and high torque, and also ensures the compactness of the universal shaft coupling, so that the gear type coupling can flexibly move to compensate for the changes in angle and displacement.

[0038] (10) The utility model discloses a bellows drum gear type universal shaft coupling, and the insulating tube is hollow, the connecting shaft head has the through hole that communicates with the insulating tube, the sealed space of the gear type coupling on the both ends of the transmission shaft is communicated together, the air pressure balance of the gear type coupling on the both sides is realized, and the sealing reliability of the lubricating medium is guaranteed. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 It is the whole cross section structure schematic view of a bellows drum gear type universal shaft coupling of the utility model;

[0040] Figure 2 It is the structure schematic view of unilateral gear type coupling in a bellows drum gear type universal shaft coupling of the utility model;

[0041] Figure 3 It is the structure schematic view of transmission shaft in a bellows drum gear type universal shaft coupling of the utility model;

[0042] Figure 4 It is the cross section structure schematic view of outer tooth cover in a bellows drum gear type universal shaft coupling of the utility model;

[0043] Figure 5 It is the second bellows drum gear type universal shaft coupling of the utility model's partial structure schematic view;

[0044] Figure 6 It is the third bellows drum gear type universal shaft coupling of the utility model's partial structure schematic view.

[0045] The label explanation in schematic diagram is:

[0046] 1, transmission shaft;1a, neck end head;1b, inner concave transition arc surface;1-1, insulating tube;1-2, connecting shaft head;

[0047] 2, gear type coupling;2-1, inner tooth cover;2-1-1, limiting portion;2-1-2, external flange;2-2, outer tooth cover;2-2-1, drum gear;2-2-2, connecting sleeve;2-2-3, annular cavity;2-2-4, toothless part;2-3, bellows;2-4, rear end cover;2-5, end cover fixing bolt;2-6, compression ring;2-7, compression ring fixing bolt;2-8, sealing cover;2-8a, recessed cavity;2-9, check ring. DETAILED DESCRIPTION

[0048] For further understanding the contents of the utility model, the utility model is described in detail in combination with the drawings and examples.

[0049] [example 1]

[0050] In combination Figure 1As shown, the bellows drum gear type universal shaft coupling of the embodiment comprises a transmission shaft 1 and gear type couplings 2 arranged at both ends of the transmission shaft 1. The length of the transmission shaft 1 is determined according to the transmission distance. The gear type coupling 2 comprises an inner tooth sleeve 2-1, an outer tooth sleeve 2-2, a bellows 2-3 and a sealing cover 2-8. The outer tooth sleeve 2-2 is engagedly installed in the inner tooth sleeve 2-1. The outer tooth sleeve 2-2 can axially move within a certain range and tilt by a certain angle in the inner tooth sleeve 2-1, so that the inner tooth sleeve 2-1 and the outer tooth sleeve 2-2 have a certain angular displacement compensation. The shaft head part of the transmission shaft 1 is connected with the outer tooth sleeve 2-2. One end of the bellows 2-3 is sealingly connected with the outer tooth sleeve 2-2, and the other end is sealingly connected with the inner tooth sleeve 2-1 close to one side of the transmission shaft 1. The sealing cover 2-8 is arranged at the side of the inner tooth sleeve 2-1 away from the transmission shaft 1. The sealing cover 2-8 and the bellows 2-3 realize the sealing of the lubricating medium (such as lubricating grease, etc.) in the inner tooth sleeve 2-1 and the outer tooth sleeve 2-2, and ensure the working stability of the gear type coupling under the working condition of the universal shaft transmission. By organically combining the transmission shaft 1 with the gear type couplings at both ends, and using the gear type coupling as the rotating joint of the universal shaft, the transmission efficiency is improved. The service life of the gear type coupling is long, the transmission is stable and reliable, the installation and maintenance are convenient, and the maintenance cost of the existing universal shaft is reduced.

[0051] [Embodiment 2]

[0052] The basic structure and working principle of the bellows drum gear type universal shaft coupling of the embodiment are the same as those of embodiment 1, and the difference lies in that:

[0053] Referring to Figure 2 As shown, in the embodiment, the outer periphery of the outer tooth sleeve 2-2 has drum teeth 2-2-1 engaged with the inner tooth ring of the inner tooth sleeve 2-1. Each drum tooth 2-2-1 has a concentric circular arc tooth profile, and the center O of the circular arc tooth profile is located on the axis of the outer tooth sleeve 2-2. In this way, in space, the circular arc tooth profile of each drum tooth 2-2-1 is located on substantially the same spherical surface, so that the outer tooth sleeve 2-2 can swing in the inner tooth sleeve 2-1 by a large angle with the center O as the center, improving the angular displacement compensation amount, thereby realizing application in occasions with large deviation, widening the application range of the drum gear type universal shaft coupling, and obtaining a drum gear type universal shaft coupling with advantages of large angle transmission and high efficiency transmission, which can be used in transmission structures such as direction shafts, and is especially suitable for electric locomotives and swing trains.

[0054] Further, the sealing cover 2-8 has a concave cavity 2-8a concaved towards the direction away from the end face of the outer sleeve 2-2, so as to form a displacement compensation space L between the sealing cover 2-8 and the outer sleeve 2-2. The concave cavity 2-8a can increase the size of the displacement compensation space L, which is beneficial to increase the axial movement of the outer sleeve 2-2, and meanwhile, the concave cavity 2-8a is also beneficial to increase the overall structural strength of the sealing cover 2-8. Referring to Figure 4 As shown in FIG. 2, the middle part of the outer sleeve 2-2 has a connecting sleeve 2-2-2 connected with the shaft head part of the transmission shaft 1, and the outer side of the connecting sleeve 2-2-2 has an annular cavity 2-2-3, which is enclosed by the drum-shaped tooth 2-2-1 and the outer wall of the connecting sleeve 2-2-2. The bellows 2-3 is sleeved in the annular cavity 2-2-3, and one end of the bellows 2-3 is sealingly fixed in the groove bottom of the annular cavity 2-2-3 by the pressing ring 2-6. Specifically, the pressing ring 2-6 can be fixed on the outer sleeve 2-2 by the pressing ring fixing bolt 2-7, and the one end of the bellows 2-3 is tightly fixed by the pressing of the pressing ring 2-6. A sealing ring can also be arranged between the flange of the bellows 2-3 and the groove bottom of the annular cavity 2-2-3. The inner sleeve 2-1 has a rear end cover 2-4 installed on the side close to the transmission shaft 1. Specifically, the rear end cover 2-4 can be installed on one side of the inner sleeve 2-1 by the end cover fixing bolt 2-5, and a sealing ring can also be arranged between the rear end cover 2-4 and the inner sleeve 2-1. The other end of the bellows 2-3 is sealingly connected to the center hole of the rear end cover 2-4. The design of the detachable rear end cover 2-4 can facilitate the installation and maintenance. The center hole of the rear end cover 2-4 has a larger diameter than the outer diameter of the shaft head part of the transmission shaft 1, and an annular angular displacement movement space ΔD is formed between the center hole of the rear end cover 2-4 and the shaft head part of the transmission shaft 1. Through the above structural optimization, the angular displacement compensation amount is further increased, so that the universal shaft coupling can be used for large-angle transmission like the existing universal shaft. The displacement compensation space L and the angular displacement movement space ΔD can be determined according to the specific design requirements.

[0055] Specifically, in the embodiment, referring to Figure 2 and Figure 4 As shown in FIG. 2, the inner side of the inner sleeve 2-1 away from the rear end cover 2-4 also has a limiting part 2-1-1, and the outer periphery of the outer sleeve 2-2 close to the limiting part 2-1-1 also has a toothless part 2-2-4. The toothless part 2-2-4 is relative to the drum-shaped tooth 2-2-1, and the outer diameter of the toothless part 2-2-4 is smaller than that of the drum-shaped tooth 2-2-1. When the outer sleeve 2-2 is axially deflected relative to the inner sleeve 2-1, the toothless part 2-2-4 can effectively avoid the other internal structures, so as to ensure the maximum angular displacement compensation amount of the tooth type coupling. The limiting part 2-1-1 can limit the axial movement of the outer sleeve 2-2, so as to ensure the reliability of the transmission. The limiting part 2-1-1 can be integrally formed on the inner side wall of the inner sleeve 2-1 (such as Figure 2As shown), the limiting portion 2-1-1 can also be designed as a limiting ring and assembled in the inner gear sleeve 2-1. In addition, in order to facilitate the installation of the universal joint, the inner gear sleeve 2-1 is further provided with an external flange 2-1-2 on the side away from the transmission shaft 1.

[0056] catch Figure 2 As shown, the inner side wall of the inner gear sleeve 2-1 has a limiting step that matches the sealing cover 2-8. The sealing cover 2-8 is positioned and installed on the limiting step and fixed by the retaining ring 2-9. A sealing ring is also provided between the sealing cover 2-8 and the inner gear sleeve 2-1. The sealing cover 2-8 is easy to install and has a reliable seal. In this embodiment, the rear end cover 2-4 is installed separately on the inner gear sleeve 2-1. At this time, the sealing cover 2-8 can be installed in the inner gear sleeve 2-1 from the side where the rear end cover 2-4 is located. Figure 2 As shown, the sealing cover 2-8 can be installed in the inner gear sleeve 2-1 and fixed with the retaining ring 2-9, and then the outer gear sleeve 2-2, the bellows 2-3 and the rear end cover 2-4 can be installed.

[0057] [Example 3]

[0058] The bellows drum gear type universal shaft coupling of this embodiment has the same basic structure and working principle as that of Embodiment 1 and Embodiment 2, except that:

[0059] Reference Figure 1 and Figure 3 As shown, in this embodiment, the drive shaft 1 includes an insulating tube 1-1 and connecting shaft heads 1-2 fixed at both ends of the insulating tube 1-1. The connecting shaft heads 1-2 are used to connect to the outer gear sleeve 2-2 of the corresponding gear coupling 2. The insulating tube 1-1 provides electrical insulation for the entire drive shaft 1. When used in rail transit power transmission, it ensures stable insulation between the driving and driven sides, thereby ensuring the stability and safety of the EMU operation.

[0060] Further, the end of the connecting shaft head 1-2 has a necked end head 1a, the root of the necked end head 1a has an inner concave transition arc surface 1b, the necked end head 1a can be sleeved in the connecting sleeve 2-2-2, the outer diameter of the necked end head 1a is smaller, and the size of the angular displacement space AD can be increased without increasing the size of the central hole of the rear end cover 2-4. In addition, the necked end head 1a design makes the diameter of the insulating tube 1-1 larger, ensures the overall strength of the transmission shaft 1, meets the working conditions of high speed and high torque, and also ensures the compactness of the structure of the universal shaft coupling, so that the tooth coupling can move flexibly to compensate for the change in angle and displacement. In addition, the insulating tube 1-1 is a hollow tube, and the connecting shaft head 1-2 has a through hole in communication with the insulating tube 1-1, so that the sealing spaces of the tooth couplings at both ends of the transmission shaft 1 are connected together, the air pressure balance of the tooth couplings at both sides is realized, and the sealing reliability of the lubricating medium is ensured. Of course, the through hole on the connecting shaft head 1-2 can also be closed by a screw plug or not provided with a through hole according to needs.

[0061] [Example 4]

[0062] Figure 5 A bellows drum tooth type universal shaft coupling using another structure of tooth coupling 2 is shown. Referring to Figure 5 As shown, different from the above-mentioned examples 1 to 3, in the present example, the rear end cover 2-4 is integrally formed on the inner tooth sleeve 2-1, that is, the inner tooth sleeve 2-1 integrally has the rear end cover 2-4 on the side close to the transmission shaft 1. The inner tooth sleeve 2-1 is in a straight cylindrical structure, at this time, the bellows 2-3, the outer tooth sleeve 2-2 and the sealing cover 2-8 are installed from the side of the inner tooth sleeve 2-1 away from the transmission shaft 1. In addition, the above-mentioned limiting part 2-1-1 adopts a limiting ring structure and is installed in the inner tooth sleeve 2-1 by a hole snap spring.

[0063] In the present example, in order to facilitate the assembly of the connecting shaft head 1-2 and the connecting sleeve 2-2-2, oil pressure method is adopted for assembly. For this purpose, a threaded connection hole for implementing oil pressure assembly is further provided at the end of the connecting shaft head 1-2. The threaded connection hole can be located at the center of the connecting shaft head 1-2 or offset. Among them Figure 5 The offset threaded connection hole is adopted.

[0064] [Example 5]

[0065] Figure 6 A bellows drum tooth type universal shaft coupling using another structure of tooth coupling 2 is shown. Referring to Figure 6 As shown, its basic structure and working principle are the same as those of example 4, and the difference lies in that:

[0066] The threaded connection hole for implementing the oil pressure assembly method is located in the center of the connecting shaft head 1-2, and at this time, the lubricating medium sealing cavity of the tooth coupling 2 cannot communicate with the insulating pipe 1-1, that is, the tooth couplings 2 on both sides are independent of each other.

[0067] It should be noted that, Figure 5 and Figure 6 Figure 2 is a partial view of a bellows drum gear type universal shaft coupling, and the tooth couplings 2 on both sides of the transmission shaft 1 are the same structure.

[0068] The bellows drum gear type universal shaft coupling of the utility model has the transmission shaft and the tooth couplings at both ends organically combined, uses the tooth coupling as the rotary joint of the universal shaft, improves the transmission efficiency, and has long service life of the tooth coupling, stable and reliable transmission, convenient installation and maintenance, and reduced maintenance cost of the existing universal shaft. In addition, through the structural optimization design of the tooth coupling, the angular displacement compensation amount is improved, so that the application in the larger deviation occasion is realized, the application range of the drum gear type universal shaft coupling is widened, a drum gear type universal shaft coupling with the advantages of large-angle transmission and high-efficiency transmission is obtained, and can be used in transmission structures such as direction shaft, and is especially suitable for electric locomotives and swing trains.

[0069] The utility model and its implementation mode are described above schematically, and the description is not restrictive, and the shown in the drawings is only one of the implementation modes of the utility model, and the actual structure is not limited thereto. Therefore, if the ordinary skilled in the art is inspired thereby, without departing from the purpose of the utility model, similar structural modes and embodiments are not designed creatively, and all should belong to the protection scope of the utility model.

Claims

1. A bellows flexspline gimbal shaft coupling characterized by: The transmission shaft (1) and the gear coupling (2) arranged at both ends of the transmission shaft (1), the gear coupling (2) comprises an inner gear sleeve (2-1), an outer gear sleeve (2-2), a bellows (2-3) and a sealing cover (2-8), the outer gear sleeve (2-2) is engagedly installed in the inner gear sleeve (2-1), the shaft head part of the transmission shaft (1) is connected with the outer gear sleeve (2-2), one end of the bellows (2-3) is sealingly connected with the outer gear sleeve (2-2), the other end is sealingly connected with the inner gear sleeve (2-1) near the side of the transmission shaft (1), and the sealing cover (2-8) is arranged at the side of the inner gear sleeve (2-1) away from the transmission shaft (1).

2. A bellows flexspline gimbal coupling as claimed in claim 1, characterized in that: The outer periphery of the outer gear sleeve (2-2) has drum-shaped teeth (2-2-1) engaged with the inner gear ring of the inner gear sleeve (2-1), each drum-shaped tooth (2-2-1) has a concentric circular arc tooth profile, and the center O of the circular arc tooth profile is located on the axis of the outer gear sleeve (2-2).

3. A bellows flexspline gimbal coupling as claimed in claim 2, characterized in that: The sealing cover (2-8) has a recessed cavity (2-8a) recessed away from the end face of the outer gear sleeve (2-2) to form a displacement compensation space L between the sealing cover (2-8) and the outer gear sleeve (2-2).

4. A bellows flexspline gimbal coupling as claimed in claim 3, characterized in that: The middle part of the outer gear sleeve (2-2) has a connecting sleeve (2-2-2) connected with the shaft head part of the transmission shaft (1), the outer side of the connecting sleeve (2-2-2) has an annular cavity (2-2-3), the bellows (2-3) is sleeved in the annular cavity (2-2-3), one end of the bellows (2-3) is sealingly fixed in the groove bottom of the annular cavity (2-2-3) through a pressing ring (2-6), the side of the inner gear sleeve (2-1) near the transmission shaft (1) is integrally provided with or separately provided with a rear end cover (2-4), the other end of the bellows (2-3) is sealingly connected at the center hole of the rear end cover (2-4), the center hole of the rear end cover (2-4) has a larger diameter than the outer diameter of the shaft head part of the transmission shaft (1), and an annular angular displacement active space ΔD is formed between the center hole of the rear end cover (2-4) and the shaft head part of the transmission shaft (1).

5. A bellows flexspline gimbal coupling as claimed in claim 4, characterized in that: The inner side of the inner gear sleeve (2-1) away from the side of the rear end cover (2-4) is further provided with a limiting part (2-1-1), and the outer periphery of the outer gear sleeve (2-2) near the side of the limiting part (2-1-1) further has a toothless part (2-2-4).

6. A bellows flexspline gimbal coupling as in claim 4, wherein: The side of the inner gear sleeve (2-1) away from the transmission shaft (1) further has an outer flange (2-1-2).

7. A bellows flexspline gimbal coupling as in claim 4 wherein: The sealing cover (2-8) and the inner gear sleeve (2-1) are further provided with a sealing ring; when the rear end cover (2-4) is integrally formed on the inner gear sleeve (2-1), the sealing cover (2-8) is installed from the side of the inner gear sleeve (2-1) away from the transmission shaft (1); when the rear end cover (2-4) is separately installed on the inner gear sleeve (2-1), the sealing cover (2-8) can be installed in the inner gear sleeve (2-1) from the side of the rear end cover (2-4).

8. A bellows flexspline gimbal coupling as claimed in any one of claims 1 to 7, characterised in that: The transmission shaft (1) comprises an insulating tube (1-1) and connecting shaft heads (1-2) fixed at both ends of the insulating tube (1-1), and the connecting shaft heads (1-2) are used for connecting with outer tooth sleeves (2-2) of gear type couplings (2) on the corresponding sides.

9. A bellows flexspline gimbal coupling as claimed in claim 8, characterized in that: The end of the connecting shaft head (1-2) has a necked end head (1a), and the root of the necked end head (1a) has an inner concave transition arc surface (1b).

10. The bellows flexspline gimbal coupling of claim 8, wherein: The insulating tube (1-1) is a hollow tube, and the connecting shaft head (1-2) has a through hole in communication with the insulating tube (1-1).

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