Drum gear coupling and gear transmission system having the same

Abstract

The present invention provides a drum gear coupling and a gear transmission system having the same. The drum gear coupling comprises: a sleeve, the sleeve comprises a barrel and an inner tooth portion arranged on the inner circumference of the barrel; a drum gear, at least a part of the drum gear is arranged in the cavity of the sleeve, the drum gear comprises a barrel, an extension portion and a drum gear portion, the extension portion extends from the first end of the barrel to the second end of the barrel, an annular gap with an opening is formed between the extension portion and the barrel, the drum gear portion is arranged on the outer circumference of the extension portion, the drum gear portion is meshed with the inner tooth portion, the drum gear can swing and move axially relative to the sleeve, and the outer circumference of the barrel has a first arcuate surface protruding outward; an annular sealing portion, the annular sealing portion is sleeved on the outer circumference of the barrel, and the first end of the annular sealing portion contacts the first arcuate surface, and the second end of the annular sealing portion is directly or indirectly connected to the barrel. This solution can solve the problem of poor sealing of the drum gear coupling.

Description

Technical Field

[0001] The present invention relates to the technical field of couplings, and in particular to a drum gear coupling and a gear transmission system having the same. Background Art

[0002] The coupling is mainly used to connect two shafts (driving shaft and driven shaft) in different mechanisms and make them rotate together to complete the task of torque transmission. It is widely used in mechanical transmission equipment. In the field of rail transportation, the coupling is a key component on the bogie of rail vehicles, and plays an important role in transmitting traction loads and compensating for the displacement deviation between the motor output shaft and the high-speed shaft of the gearbox. In the high-speed and heavy-load power transmission of rail transportation, the coupling must also have the functions of buffering, vibration reduction and improving dynamic performance.

[0003] There are many types of couplings, which can usually be divided into two categories: fixed couplings and movable couplings according to the relative position and position changes of the two connected shafts. Fixed couplings are mainly used in places where the two shafts are required to be strictly aligned and no relative displacement occurs during operation. Removable couplings are mainly used in places where the two shafts are deflected or have relative displacement during operation. According to the method of compensating displacement, movable couplings are divided into rigid movable couplings and elastic movable couplings. Drum gear couplings are one of the rigid movable couplings. Because of their relatively large axial, radial and angular displacement compensation capabilities, they are widely used in various mechanical transmission systems such as rail transportation, ships, and mines.

[0004] The drum gear coupling is mainly composed of a sleeve with internal teeth and a drum gear with external teeth, which mesh with each other. Since the external teeth of the drum gear are processed into a drum shape, angular displacement and axial displacement are allowed between the sleeve and the drum gear, thereby allowing the driving shaft and the driven shaft connected by the drum gear coupling to have relative displacement during rotation.

[0005] Usually one side of the drum gear coupling is connected to the output shaft (driving shaft) of the motor, and the other side of the drum gear coupling is connected to the input shaft (driven shaft) of the gear transmission box.

[0006] Since the two shafts connected by the drum gear coupling will have relative displacement during operation, the tooth surfaces of the inner and outer teeth will periodically slide relative to each other in the axial direction, which will inevitably cause tooth surface wear and power loss. In order to reduce the wear of the gear teeth and the friction resistance of relative movement, the coupling needs to work under good lubrication and sealing conditions.

[0007] Patent CN1181469A discloses a coupling that can ensure sealing and extend the life of the seal when the axes of the two connected shafts are misaligned. The patent mainly uses a spring arranged on the drum gear shaft to push and slide the seal with a spherical sealing surface arranged on the outer circumference of the drum gear body and the adapting surface of the end cover to achieve close contact, thereby enhancing the sealing of the coupling, reducing the wear of the seal, and extending the life of the seal.

[0008] Patent CN1101899C discloses a coupling that can avoid medium exchange and seal wear during operation. The solution adopted is to set at least one axial bellows fixed to one of the two parts between the coupling sleeve and each connecting member. The bellows not only seals the synchronous gear pair, but also can elastically adjust the position of the coupling sleeve.

[0009] In the above patents or other prior arts, when the drum gear of the drum gear coupling deflects relative to the sleeve, the seal between the seal and the drum gear is not tight, and different parts of the seal wear unevenly, which greatly affects the sealing effect and service life of the coupling. Summary of the invention

[0010] The invention provides a drum gear coupling and a gear transmission system having the same, so as to solve the problem of poor sealing performance of the drum gear coupling in the prior art.

[0011] In order to solve the above-mentioned problem, according to one aspect of the present invention, there is provided a drum gear coupling, comprising: a sleeve, the sleeve comprising a cylinder body and an internal tooth portion arranged on the inner circumferential surface of the cylinder body; a drum gear, at least a part of the drum gear is arranged in the cavity of the sleeve, the drum gear comprises a sleeve body, an extension portion and a drum tooth portion, the extension portion extends from the first end of the sleeve body to the second end of the sleeve body, an annular gap with an opening is formed between the extension portion and the sleeve body, the drum tooth portion is arranged on the outer circumferential surface of the extension portion, the drum tooth portion is meshed with the internal tooth portion, the drum gear can swing and move axially relative to the sleeve, and the outer circumferential surface of the sleeve body has a first arcuate surface protruding outward; an annular sealing portion, the annular sealing portion is sleeved on the outer circumferential surface of the sleeve body, and the first end of the annular sealing portion is in contact with the first arcuate surface, and the second end of the annular sealing portion is directly or indirectly connected to the cylinder body.

[0012] Further, a plane perpendicular to the axial direction of the drum-shaped tooth portion and passing through the midpoint of the width of the drum-shaped tooth portion is a central plane, and the highest point of the first arc-shaped surface is located on the central plane.

[0013] Furthermore, the first arc-shaped surface is a spherical surface.

[0014] Furthermore, the surface where the tooth top of the drum-shaped tooth portion is located is a second spherical surface, and the center of the first arc-shaped surface coincides with the center of the second spherical surface.

[0015] Furthermore, the sleeve body includes a first sleeve section and a second sleeve section connected in sequence, the extension portion is arranged around the first sleeve section and extends toward the second sleeve section, and the first arc surface is located on the outer circumferential surface of the second sleeve section.

[0016] Furthermore, the outer circumferential surface of the second set segment is a spherical surface, or the outer circumferential surface of the second set segment is composed of a spherical surface and a cylindrical surface.

[0017] Furthermore, the drum gear coupling also includes: a limiting structure connected to the cylinder, the limiting structure is used to limit the movement range of the drum gear, and the second end of the annular sealing part is arranged on the limiting structure.

[0018] Furthermore, the limiting structure includes: a second limiting portion, the second limiting portion is connected to the end of the cylinder, the second limiting portion is located on the side of the drum gear having an annular gap, the second limiting portion is used to abut against the sleeve of the drum gear or the extension of the drum gear, and the second end of the annular sealing portion is fixedly arranged on the second limiting portion.

[0019] Furthermore, the second limiting portion is used to abut against the sleeve body of the drum gear, and the second limiting portion has a second arcuate surface that matches the first arcuate surface.

[0020] Furthermore, the second limiting portion includes: a first end cover, the large diameter end of the first end cover is connected to the end of the cylinder; a limiting member, arranged at the small diameter end of the first end cover, the second arc surface is arranged on the limiting member, and the second end of the annular sealing portion is connected to the limiting member or the first end cover.

[0021] Furthermore, the first end cover includes an annular member arranged along the radial direction of the cylinder and a cylindrical member arranged along the axial direction of the cylinder, the annular member is connected to the end of the cylinder, the cylindrical member is located on the side of the extension portion of the annular member facing the drum-shaped tooth portion, and the limit member is connected to the inner wall of the cylindrical member.

[0022] Furthermore, the second limiting portion is used to abut against the extension portion of the drum-shaped tooth portion, and the sleeve also includes a second end cover connected to the end of the cylinder body, the second end cover is arranged radially along the cylinder body, the second end cover has a center hole for allowing the sleeve body to pass through, and the second end cover forms a second limiting portion.

[0023] Furthermore, the second end of the annular sealing portion is connected to the second end cover via a fastener.

[0024] Furthermore, a groove is provided on the inner end surface of the second end cover, and the second end of the annular sealing portion is interference-fitted in the groove of the second end cover.

[0025] Furthermore, the annular sealing portion includes a frame, a sealing member and a supporting member, wherein the sealing member and the supporting member are respectively connected to two sides of the frame, wherein the supporting member is connected to the second end cover, and the sealing member is in contact with the first arc surface.

[0026] Furthermore, a first spherical surface is provided on the side of the extension portion of the drum gear facing away from the annular gap, and the limiting structure also includes: a first limiting portion, fixed in the cavity of the cylindrical body of the sleeve, the first limiting portion is located on the side of the extension portion facing away from the annular gap, the first limiting portion has a third spherical surface, and the third spherical surface is adapted to the first spherical surface to limit the moving distance of the drum gear.

[0027] Furthermore, a first step is provided on the inner circumference of the cylinder, the first limiting portion is a cylindrical structure, and a second step is provided on the outer circumference of the first limiting portion, and the second step is limitedly matched with the first step.

[0028] Furthermore, the end surface of the first limiting portion abuts against the end surface of the inner tooth portion.

[0029] Furthermore, the first limiting portion is a cylindrical structure, and a sealing ring is provided between the outer wall of the first limiting portion and the inner wall of the cylinder.

[0030] Furthermore, the drum gear coupling further comprises: a clamping ring, a part of which is embedded in the inner wall of the cylinder, and another part of which is in contact with the end surface of the first limiting portion away from the inner tooth portion.

[0031] Furthermore, the first limiting portion is a cylindrical structure, and the first limiting portion has a first through hole.

[0032] Furthermore, the cylinder body is provided with a second through hole, the second through hole is communicated with the first through hole, and the drum gear coupling further comprises: a plug, the plug is used to block the second through hole.

[0033] Furthermore, the extension portion has a third through hole, and the third through hole is used to connect the cavities on both sides of the extension portion.

[0034] Furthermore, an oil guide groove is provided on the inner circumferential surface of the sleeve body of the drum gear.

[0035] Furthermore, the drum gear coupling further comprises: a bushing, which is arranged on the inner circumferential surface of the sleeve body, and the outer circumferential surface of the bushing is interference fit with the inner circumferential surface of the sleeve body.

[0036] Furthermore, the drum gear coupling includes two sleeves, two drum gears and two annular sealing parts, the two sleeves are connected to each other, the two drum gears are arranged in a one-to-one correspondence with the two sleeves, and the two annular sealing parts are arranged in a one-to-one correspondence with the two sleeves.

[0037] Furthermore, the annular sealing part includes a frame and a sealing member vulcanized into one with the frame, the frame is interference-fitted in a groove of an inner wall of the cylindrical member of the first end cover, and the sealing member is in sliding contact with the first arcuate surface.

[0038] Furthermore, the annular sealing portion includes a frame and a sealing member vulcanized into one with the frame, the frame is interference-fitted in the groove of the second end cover, and the sealing member is in sliding contact with the first arcuate surface.

[0039] According to another aspect of the present invention, a gear transmission system is provided, which includes the drum gear coupling provided above, and the gear transmission system also includes a transmission gearbox, and the input shaft of the transmission gearbox and the inner circumference of the sleeve body of the drum gear of the drum gear coupling are conical interference fit.

[0040] By applying the technical solution of the present invention, an internal tooth portion is provided in the sleeve of the drum gear coupling, and a drum gear portion is provided on the extension portion of the drum gear, so that the drum gear can swing and move axially relative to the sleeve through the cooperation of the drum gear portion and the internal tooth portion, and the sealing is performed through the cooperation of the annular sealing portion and the sleeve body. Since the outer peripheral surface of the sleeve body of the drum gear has a first arc surface, when the drum gear deflects relative to the sleeve, the circumference of the annular sealing portion is in uniform contact with the first arc surface of the sleeve body for sealing. This can ensure a good sealing effect at different positions on the one hand, and make the annular sealing portion wear evenly on the other hand, thereby improving the sealing effect and service life of the drum gear coupling during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0042] Figure 1 A schematic structural diagram of a drum gear coupling provided by Embodiment 1 of the present invention in an initial position is shown;

[0043] Figure 2 Shows Figure 1 A schematic diagram of the structure in which the drum gear coupling is in an inclined position;

[0044] Figure 3 Shows Figure 1 A structural schematic diagram of the drum gear coupling in an extreme position;

[0045] Figure 4 Shows Figure 1 A schematic diagram of the structure of the drum gear coupling in another extreme position;

[0046] Figure 5 A schematic structural diagram of a drum gear coupling provided in the second embodiment of the present invention is shown;

[0047] Figure 6 A schematic structural diagram of a drum gear coupling provided in a third embodiment of the present invention is shown;

[0048] Figure 7 Shows Figure 6Schematic diagram of the structure of the drum gear coupling in an inclined position.

[0049] The above drawings include the following reference numerals:

[0050] 10. sleeve; 11. cylinder body; 111. first step; 12. inner tooth portion; 13. second end cover; 20. drum gear; 21. sleeve body; 211. first arcuate surface; 212. first sleeve section; 213. second sleeve section; 214. oil guide groove; 22. extension portion; 221. first spherical surface; 23. drum tooth portion; 24. annular gap; 25. third through hole; 30. first limiting portion; 31. third spherical surface; 32. second step; 33. first through hole; 41. sealing ring; 42. retaining ring; 43. plugging; 44. fastener; 50. annular sealing portion; 51. skeleton; 52. sealing member; 53. support member; 60. second limiting portion; 61. second arcuate surface; 62. first end cover; 63. limiting member; 70. bushing. DETAILED DESCRIPTION

[0051] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] like Figures 1 to 4 As shown, the first embodiment of the present invention provides a drum gear coupling, comprising: a sleeve 10, the sleeve 10 comprises a cylinder 11 and an inner tooth portion 12 arranged on the inner circumferential surface of the cylinder 11; a drum gear 20, at least a portion of the drum gear 20 is arranged in the cavity of the sleeve 10, the drum gear 20 comprises a sleeve 21, an extension portion 22 and a drum tooth portion 23, the extension portion 22 extends from the first end of the sleeve 21 to the second end of the sleeve 21, and a ring with an opening is formed between the extension portion 22 and the sleeve 21 A gap 24, a drum-shaped tooth portion 23 is arranged on the outer circumferential surface of the extension portion 22, the drum-shaped tooth portion 23 is meshed with the inner tooth portion 12, the drum gear 20 can swing and move axially relative to the sleeve 10, and a first arcuate surface 211 protruding outward is provided on the outer circumferential surface of the sleeve body 21; an annular sealing portion 50, the annular sealing portion 50 is sleeved on the outer circumferential surface of the sleeve body 21, and the first end of the annular sealing portion 50 is in contact with the first arcuate surface 211, and the second end of the annular sealing portion 50 is directly or indirectly connected to the cylinder body 11.

[0053] By applying the technical solution of this embodiment, an internal tooth portion 12 is provided in the barrel 11 of the sleeve 10 of the drum gear coupling, and a drum tooth portion 23 is provided on the extension portion 22 of the drum gear 20, so that the drum gear 20 can swing and move axially relative to the sleeve 10 through the cooperation of the drum tooth portion 23 and the internal tooth portion 12, and the sealing is performed through the cooperation of the annular sealing portion 50 and the sleeve 21. In this embodiment, the internal tooth portion 12 is specifically composed of a plurality of involute spur teeth, and the drum tooth portion 23 is composed of a plurality of drum teeth. Since the outer peripheral surface of the sleeve 21 of the drum gear 20 has a first arc surface 211, when the drum gear 20 deflects relative to the sleeve 10, the circumference of the annular sealing portion 50 and the first arc surface 211 of the sleeve 21 are in uniform contact and sealing. This can ensure that the drum gear coupling has a good sealing effect at different positions on the one hand, and on the other hand make different parts of the annular sealing portion 50 wear relatively evenly, thereby effectively improving the sealing effect and service life of the drum gear coupling during operation.

[0054] In this embodiment, the plane perpendicular to the axial direction of the drum-shaped tooth portion 23 and passing through the midpoint of the width of the drum-shaped tooth portion 23 is the center plane, and the highest point of the first arc-shaped surface 211 is located on the center plane. In the initial state, one end of the annular sealing portion 50 is in contact with the circumference of the highest point of the first arc-shaped surface 211, so that when the drum gear 20 deflects relative to the sleeve 10, the circumference of the annular sealing portion 50 is always in contact with the first arc-shaped surface 211 of the sleeve body 21, the elastic deformation is relatively less, and the sealing effect is better.

[0055] Specifically, the first arcuate surface 211 can be set as a spherical surface. The first arcuate surface 211 is set as a spherical surface, so that when the sleeve 21 rotates, even if the position of the first arcuate surface 211 in contact with the annular sealing portion 50 changes, the elastic deformation of the annular sealing portion 50 will not change when the sleeve 21 has no axial displacement; when the sleeve 21 has axial displacement, different parts of the annular sealing portion 50 in contact with the spherical surface will only undergo small uniform deformation. Therefore, through this technical solution, the first arcuate surface 211 can achieve good sealing at different contact parts of the annular sealing portion 50, and the wear of different contact parts of the annular sealing portion 50 is uniform, thereby significantly improving the sealing effect and service life of the drum gear coupling during operation. The spherical surface in this embodiment is not a complete spherical surface, and can be understood as a partial annular spherical surface.

[0056] In this embodiment, the surface where the tooth top of the drum-shaped tooth portion 23 is located is the second spherical surface, and the center of the first arc surface 211 coincides with the center of the second spherical surface. Through the above arrangement, when the drum gear 20 deflects relative to the sleeve 10, no additional torque is generated, thereby reducing the wear or vibration of the sleeve 10 and the drum gear 20, and further extending the service life of the drum gear coupling.

[0057] In this embodiment, the sleeve body 21 includes a first sleeve section 212 and a second sleeve section 213 connected in sequence, the extension portion 22 is arranged around the first sleeve section 212 and extends to the second sleeve section 213, and the first arc surface 211 is located on the outer peripheral surface of the second sleeve section 213. Specifically, the outer peripheral surface of the second sleeve section 213 is a spherical surface, or the outer peripheral surface of the second sleeve section 213 is composed of a spherical surface and a cylindrical surface. Through the above arrangement, it is convenient to arrange the overall geometric structure and shape of the drum gear coupling reasonably, the structure is compact, and it can ensure that the drum gear 20 has sufficient strength and is convenient for processing and testing. In this embodiment, the drum gear 20 is an integrally formed structure. It is preferably forged integrally formed, that is, the forging blank of the drum gear 20 is first manufactured, and then the drum gear 20 is obtained after machining the drum gear portion 23. Other molding manufacturing processes can also be used. Of course, if necessary, the drum gear 20 can also be set as a split structure.

[0058] In this embodiment, the drum gear coupling further includes: a limiting structure connected to the cylinder 11, the limiting structure is used to limit the movement range of the drum gear 20, and the second end of the annular sealing portion 50 is arranged on the limiting structure. The limiting structure can prevent the drum gear 20 from being separated from the sleeve 10.

[0059] In this embodiment, the limiting structure includes: a second limiting portion 60, the second limiting portion 60 is connected to the end of the cylinder 11, the second limiting portion 60 is located on the side of the drum gear 20 having the annular gap 24, the second limiting portion 60 is used to abut against the sleeve 21 of the drum gear 20 or the extension 22 of the drum gear 20, and the second end of the annular sealing portion 50 is fixedly arranged on the second limiting portion 60. The second limiting portion 60 can prevent the drum gear 20 from escaping from the sleeve 10.

[0060] Specifically, the second limiting portion 60 is used to abut against the sleeve 21 of the drum gear 20, and the second limiting portion 60 has a second arc surface 61 that matches the first arc surface 211. The second arc surface 61 contacts the first arc surface 211, and a large contact area is provided during limiting, which can achieve a good limiting effect. If the first arc surface 211 is a spherical surface, the second arc surface 61 is also set to be a spherical surface accordingly.

[0061] In this embodiment, the second limiting portion 60 includes: a first end cover 62, the large diameter end of the first end cover 62 is connected to the end of the cylinder 11; a limiting member 63, which is arranged at the small diameter end of the first end cover 62, the second arc surface 61 is arranged on the limiting member 63 or on the first end cover 62, and the second end of the annular sealing portion 50 is connected to the limiting member 63. In this way, the limiting member 63 can be used to limit the drum gear 20, and can also axially constrain or fix the annular sealing portion 50. The limiting member 63 can be made of metal material or wear-resistant non-metallic material.

[0062] Specifically, the first end cover 62 includes an annular member arranged along the radial direction of the cylinder 11 and a cylindrical member arranged along the axial direction of the cylinder 11, the annular member is connected to the end of the cylinder 11, the cylindrical member is located on the side of the extension portion 22 of the annular member facing the drum-shaped tooth portion 23, and the stopper 63 is connected to the inner wall of the cylindrical member. Through the above arrangement, the arrangement of the second stopper 60 and the annular sealing portion 50 is facilitated, and the compactness of the drum-shaped tooth coupling can be improved.

[0063] In this embodiment, a groove may be provided on the limiting member 63 , and the annular sealing portion 50 includes a skeleton 51 and a sealing member 52 connected to the skeleton 51 , wherein a portion of the skeleton 51 is provided in the groove, and the sealing member 52 contacts the first arcuate surface 211 .

[0064] Alternatively, in this embodiment, the annular sealing portion 50 includes a skeleton 51 and a sealing member 52 vulcanized into one piece with the skeleton 51, and forms a large diameter end supported by the skeleton 51 and a small diameter end not supported by the skeleton 51. The large diameter end constitutes the second end of the annular sealing portion 50 and is interference fit in the groove of the inner wall of the tubular member of the first end cover 62. The small diameter end constitutes the first end of the annular sealing portion 50 and is in sliding contact with the first arcuate surface 211.

[0065] In this embodiment, the side of the extension part 22 of the drum gear 20 away from the annular gap 24 is provided with a first spherical surface 221, and the limiting structure further includes: a first limiting part 30, fixed in the cavity of the barrel 11 of the sleeve 10, the first limiting part 30 is located on the side of the extension part 22 away from the annular gap 24, and the first limiting part 30 has a third spherical surface 31, and the third spherical surface 31 is adapted to the first spherical surface 221 to limit the axial movement distance of the drum gear 20. In this way, the two spherical surfaces are used for limiting, which will not affect the meshing of the drum gear part 23 and the inner gear part 12, increase the contact area of ​​the limiting area, reduce the force per unit area, and do not generate additional torque, thereby avoiding severe vibration at the limiting limit position, reducing the wear of the limiting part in the sleeve 10 and the drum gear 20, and improving the stability and service life of the drum gear coupling during operation. Furthermore, the center of the first spherical surface 221 can be made to coincide with the center of the second spherical surface, which will further improve the stability of the drum gear coupling during operation.

[0066] In this embodiment, the inner circumference of the cylinder 11 is provided with a first step 111, the first limiting portion 30 is a cylindrical structure, the outer circumference of the first limiting portion 30 is provided with a second step 32, and the second step 32 is limitedly matched with the first step 111. Through the cooperation between the second step 32 and the first step 111, the first limiting portion 30 can be limited in the axial direction of the sleeve 10, so that the first limiting portion 30 can limit the axial direction of the drum gear 20.

[0067] In this embodiment, a third through hole 25 may be provided on the extension portion 22, and the third through hole 25 is used to connect the cavities on both sides of the extension portion 22, so as to facilitate gas flow. If the cavities on both sides of the extension portion 22 are respectively sealed, the pressure in the cavity will change greatly when the extension portion 22 moves, which will cause the drum gear coupling to run unsteadily. After the cavities on both sides of the extension portion 22 are connected by the third through hole 25, the pressure in different cavities can be balanced, thereby avoiding the risk of causing unsteady operation of the drum gear coupling.

[0068] In this embodiment, the drum gear coupling includes two sleeves 10, two drum gears 20 and two annular sealing parts 50. The two sleeves 10 are connected to each other, the two drum gears 20 are arranged in a one-to-one correspondence with the two sleeves 10, and the two annular sealing parts 50 are arranged in a one-to-one correspondence with the two sleeves 10. Through the above arrangement, a drum gear coupling can be used to connect two shaft components to achieve torque transmission, and the relative displacement of the two shaft components can be compensated.

[0069] like Figure 5 As shown, in the second embodiment of the present invention, different from the above embodiment, the second limiting portion 60 is used to abut against the extension portion 22 of the drum-shaped tooth portion 23, and the sleeve 10 further includes a second end cover 13 connected to the end of the cylinder 11, the second end cover 13 is arranged radially along the cylinder 11, the second end cover 13 has a middle hole for the sleeve 21 to pass through, and the second end cover 13 forms the second limiting portion 60. Through the above arrangement, the sleeve 10 has the function of limiting the drum-shaped tooth portion 23, and the cylinder 11 and the second limiting portion 60 form an integrally formed structure to increase the structural strength.

[0070] In this embodiment, the second end of the annular sealing portion 50 is connected to the second end cover 13 via a fastener 44. This facilitates the assembly and disassembly of the annular sealing portion 50 and the second end cover 13.

[0071] In this embodiment, the annular sealing portion 50 includes a frame 51, a sealing member 52 and a supporting member 53, wherein the sealing member 52 and the supporting member 53 are respectively connected to two sides of the frame 51, wherein the supporting member 53 is connected to the second end cover 13, and the sealing member 52 is in contact with the first arc-shaped surface 211. Through the above arrangement, the strength of the annular sealing portion 50 can be improved and the service life can be improved.

[0072] In this embodiment, the end surface of the first limiting portion 30 abuts against the end surface of the inner tooth portion 12. By abutting against the end surface of the first limiting portion 30 and the end surface of the inner tooth portion 12, the first limiting portion 30 can be limited.

[0073] Furthermore, the first limiting portion 30 is a cylindrical structure, and a sealing ring 41 is provided between the outer wall of the first limiting portion 30 and the inner wall of the cylinder 11. The sealing ring 41 can improve the sealing performance of the drum gear coupling, prevent the lubricating medium inside the drum gear coupling from leaking out, and ensure the lubrication effect. The lubricating medium is preferably grease.

[0074] In this embodiment, the drum gear coupling further includes: a collar 42, a portion of which is embedded in the inner wall of the cylinder 11, and another portion of which is in contact with the end surface of the first limiting portion 30. In this way, the collar 42 can limit the direction of the first limiting portion 30 away from the inner tooth portion 12 to prevent the first limiting portion 30 from moving.

[0075] Furthermore, the first limiting portion 30 is a cylindrical structure, and has a first through hole 33, which is used to balance the air pressure and can also serve as a grease inflow channel for lubricating the limiting area to reduce wear; the first through holes 33 can be evenly arranged in the circumference, preferably symmetrically arranged with two or more. Of course, the first through hole 33 may not be provided.

[0076] Furthermore, if Figure 5 As shown, the first limiting part 30 is a cylindrical structure, and the first limiting part 30 includes a limiting ring near the inner tooth part, a clamping ring and a center plate in sequence. A sealing ring is provided between the limiting ring and the inner wall of the sleeve. One end of the clamping ring contacts the limiting ring, and the other end contacts the end face of the center plate. A sealing ring is also provided between the center plate and the inner wall of the sleeve. The outer peripheral wall of the clamping ring is partially embedded in the groove of the inner wall of the sleeve, thereby playing a role in the limiting ring and the center plate. The center plate is provided with a conical hole with a reduced inner diameter, which can play a role in blocking the lubricating medium.

[0077] like Figure 5 As shown, the cylinder 11 has a second through hole, which may or may not be connected to the first through hole 33, and the drum gear coupling further includes a plug 43, which is used to block the second through hole. In this way, a lubricating medium can be added from the outside to the inside of the cylinder 11, and then blocked by the plug 43. The cylinder 11 may not have a second through hole, and thus the plug 43 may not be provided. Lubricating oil may also be directly added to the cavity of the sleeve 10 during assembly to lubricate the inner tooth portion and the drum tooth portion.

[0078] In this embodiment, the inner circumferential surface of the sleeve body 21 of the drum gear 20 is provided with an oil guide groove 214. When the motor shaft or other shaft components installed in the sleeve body 21 are disassembled and assembled, pressure oil can be input into the oil guide groove 214 to reduce friction.

[0079] In this embodiment, the drum gear coupling further includes: a bushing 70, which is arranged on the inner circumference of the sleeve 21, and the outer circumference of the bushing 70 is interference fit with the inner circumference of the sleeve 21. The bushing 70 is used to install the motor shaft or other shaft components. The shaft components and the inner circumference of the bushing 70 are interference fit, but the interference is lower than the interference between the outer circumference of the bushing 70 and the inner circumference of the sleeve 21. In this way, when the shaft components are overloaded, the shaft components can slide axially relative to the bushing 70 to prevent component damage, thereby playing the role of overload protection.

[0080] like Figure 6 As shown, in the third embodiment of the present invention, different from the second embodiment, a groove is provided on the inner end surface of the second end cover 13, and the second end of the annular sealing portion 50 is interference-fitted in the groove of the second end cover 13. By means of interference fit, the connection strength of the annular sealing portion 50 can be improved, and space can also be saved, which is convenient for disassembly and maintenance.

[0081] In this embodiment, the annular sealing portion 50 includes a skeleton 51 and a sealing member 52 connected to the skeleton 51, wherein the skeleton 51 is connected to the second end cover 13, and the sealing member 52 is in contact with the first arc surface 211. Specifically, the annular sealing portion 50 includes a skeleton 51 and a sealing member 52 vulcanized into one with the skeleton 51, and forms a large diameter end supported by the skeleton 51 and a small diameter end not supported by the skeleton 51, the large diameter end constituting the second end of the annular sealing portion 50, interference fit in the groove of the second end cover 13, and the small diameter end constituting the first end of the annular sealing portion 50, slidingly contacting with the first arc surface 211. In this third embodiment, the drum-shaped tooth portion 23 can be contacted with the end cover to limit position, or can be contacted with a suitable end face of the large diameter end of the annular sealing portion 50 to limit position according to space allowance and process requirements.

[0082] In addition, in the third embodiment of the present invention, unlike the second embodiment, the first limiting portion 30 does not have a center plate, but only includes a limiting ring and a retaining ring, and a third spherical surface 31 that matches the first spherical surface 221 on the drum gear extension portion is provided in the inner hole wall of the limiting ring.

[0083] Figure 7 for Figure 6 The schematic diagram of the structure of the drum gear coupling in an inclined position, wherein the right half coupling connected to the gear box input shaft is in an upward radial displacement state, and the limiting portion of the sleeve of the left half coupling connected to the motor side output shaft contacts the first spherical surface on the drum gear extension portion, which plays a limiting role and avoids severe impact.

[0084] Compared with the prior art, the present invention has achieved very obvious technical advantages. On the one hand, since the present invention adopts the sliding seal matching of the drum gear with an arc surface and the annular sealing part 50, it can ensure the uniform contact seal and the minimum elastic deformation of the seal at different deflection positions to the greatest extent, and scientifically solve the common problems of poor sealing of the drum gear coupling, uneven wear of the seal and short service life that have existed in the prior art for a long time; at the same time, the optimized matching of the drum gear with an arc surface, the second end cover and the annular sealing part 50 can ensure the sealing reliability and long service life of the drum gear coupling. Therefore, the drum gear coupling provided by the present invention has reliable sealing, can effectively improve the sealing effect of the lubricating medium, and improve the sealing performance of the drum gear coupling; on the other hand, since the present invention also adopts the optimized design of the drum gear with an arc surface and the spherical limit structure with a compact structure, it can effectively eliminate the additional torque generated by the drum gear coupling during operation, and enhance the balance and stability of the coupling during operation. Therefore, the coupling provided by the present invention has stable and reliable transmission, high displacement compensation ability, and a simple and compact overall structure, which is easier to achieve lightweight and miniaturized design;

[0085] At the same time, the drum gear with an arc surface, the second end cover 13 and the annular sealing portion 50 used in the present invention have a simple structure and are easy to manufacture and replace. Therefore, the drum gear coupling provided by the present invention also has the obvious advantages of easy manufacturing, assembly, disassembly and maintenance, and low maintenance and operation costs.

[0086] Another embodiment of the present invention also provides a gear transmission system, which includes the drum gear coupling provided above. Specifically, the gear transmission system also includes a transmission gear box, and the input shaft of the transmission gear box is in a conical interference fit with the inner circumference of the inner hole of the sleeve 21 of the drum gear 20 of the drum gear coupling. Applying the technical solution of this embodiment, an internal tooth portion 12 is provided in the barrel 11 of the sleeve 10 of the drum gear coupling, and a drum tooth portion 23 is provided on the extension portion 22 of the drum gear 20, so that the drum gear 20 can swing and move axially relative to the sleeve 10 through the cooperation of the drum tooth portion 23 and the internal tooth portion 12, and the annular sealing portion 50 is sealed by the cooperation with the sleeve 21. Since the outer circumferential surface of the sleeve 21 of the drum gear 20 has a first arc surface 211, when the drum gear 20 deflects relative to the sleeve 10, the circumference of the annular sealing portion 50 is in uniform contact with the first arc surface 211 of the sleeve 21 for sealing. This can ensure that the drum gear coupling has a good sealing effect at different offset positions, and can also make the wear of different contact parts of the annular sealing portion 50 uniform, thereby improving the reliability of the gear transmission system.

[0087] In summary, the drum gear coupling provided by the present invention has a compact structure, reliable sealing, strong load-bearing capacity, large displacement compensation capability, high transmission stability, long service life, and convenient maintenance. It can be applied to various transmission mechanisms, and is particularly suitable for use in transmission equipment with high coupling transmission requirements and complex and changeable operating conditions. It is especially suitable for rail vehicle gear transmission systems in which the motor output shaft and the gearbox high-speed shaft are misaligned during operation under various road conditions in rail transit.

[0088] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A drum gear coupling, characterized in that: include: A sleeve (10), the sleeve (10) comprising a cylinder (11) and an inner tooth portion (12) arranged on the inner circumferential surface of the cylinder (11); A drum gear (20), wherein at least a portion of the drum gear (20) is disposed in a cavity of the sleeve (10), the drum gear (20) comprises a sleeve body (21), an extension portion (22) and a drum-shaped tooth portion (23), the extension portion (22) extending from a first end of the sleeve body (21) to a second end of the sleeve body (21), an annular gap (24) with an opening is formed between the extension portion (22) and the sleeve body (21), the drum-shaped tooth portion (23) is disposed on an outer peripheral surface of the extension portion (22), the drum-shaped tooth portion (23) meshes with the inner tooth portion (12), the drum gear (20) can swing and move axially relative to the sleeve (10), and the outer peripheral surface of the sleeve body (21) has a first arcuate surface (211) protruding outwards; an annular sealing portion (50), wherein the annular sealing portion (50) is sleeved on the outer peripheral surface of the sleeve (21), and a first end of the annular sealing portion (50) is in contact with the first arc-shaped surface (211), and a second end of the annular sealing portion (50) is directly or indirectly connected to the cylinder (11); A first spherical surface (221) is provided on the side of the extension portion (22) of the drum gear (20) that is away from the annular gap (24). The drum gear coupling further comprises: a first limiting portion (30) fixed in the cavity of the cylinder body (11) of the sleeve (10), the first limiting portion (30) being located on the side of the extension portion (22) that is away from the annular gap (24), the first limiting portion (30) having a third spherical surface (31), the third spherical surface (31) being adapted to the first spherical surface (221) to limit the moving distance of the drum gear (20).

2. The drum gear coupling according to claim 1, characterized in that: A plane perpendicular to the axial direction of the drum-shaped tooth portion (23) and passing through the midpoint of the width of the drum-shaped tooth portion (23) is a central plane, and the highest point of the first arc-shaped surface (211) is located on the central plane.

3. The drum gear coupling according to claim 1, characterized in that: The first arc-shaped surface (211) is a spherical surface.

4. The drum gear coupling according to claim 3, characterized in that: The surface where the tooth top of the drum-shaped tooth portion (23) is located is a second spherical surface, and the center of the first arc surface (211) coincides with the center of the second spherical surface.

5. The drum gear coupling according to claim 1, characterized in that: The sleeve body (21) comprises a first sleeve section (212) and a second sleeve section (213) which are connected in sequence, the extension portion (22) is arranged around the first sleeve section (212) and extends toward the second sleeve section (213), and the first arcuate surface (211) is located on the outer peripheral surface of the second sleeve section (213).

6. The drum gear coupling according to claim 5, characterized in that: The outer circumferential surface of the second sleeve section (213) is a spherical surface, or the outer circumferential surface of the second sleeve section (213) is composed of a spherical surface and a cylindrical surface.

7. The drum gear coupling according to claim 1, characterized in that: The drum gear coupling also includes: A second limiting portion (60), the second limiting portion (60) is connected to the end of the cylinder (11), the second limiting portion (60) is located on the side of the drum gear (20) having the annular gap (24), the second limiting portion (60) is used to abut against the sleeve (21) of the drum gear (20) or the extension portion (22) of the drum gear (20), and the second end of the annular sealing portion (50) is fixedly arranged on the second limiting portion (60).

8. The drum gear coupling according to claim 7, characterized in that: The second limiting portion (60) is used to abut against the sleeve (21) of the drum gear (20), and the second limiting portion (60) has a second arcuate surface (61) that matches the first arcuate surface (211).

9. The drum gear coupling according to claim 8, characterized in that: The second limiting portion (60) comprises: A first end cover (62), wherein a large diameter end of the first end cover (62) is connected to an end of the cylinder (11); A limiting member (63) is arranged at the small-diameter end of the first end cover (62), the second arc-shaped surface (61) is arranged on the limiting member (63), and the second end of the annular sealing portion (50) is connected to the limiting member (63) or the first end cover (62).

10. The drum gear coupling according to claim 9, characterized in that: The first end cover (62) comprises an annular member arranged along the radial direction of the cylinder (11) and a cylindrical member arranged along the axial direction of the cylinder (11), the annular member is connected to the end of the cylinder (11), the cylindrical member is located on the side of the extension portion (22) of the annular member facing the drum-shaped tooth portion (23), and the limiting member (63) is connected to the inner wall of the cylindrical member.

11. The drum gear coupling according to claim 7, characterized in that: The second limiting portion (60) is used to abut against the extension portion (22) of the drum-shaped tooth portion (23), and the sleeve (10) also includes a second end cover (13) connected to the end of the cylinder (11), and the second end cover (13) is radially arranged along the cylinder (11), and the second end cover (13) has a center hole for allowing the sleeve (21) to pass through, and the second end cover (13) forms the second limiting portion (60).

12. The drum gear coupling according to claim 11, characterized in that: The second end of the annular sealing portion (50) is connected to the second end cover (13) via a fastener (44).

13. The drum gear coupling according to claim 11, characterized in that: A groove is provided on the inner end surface of the second end cover (13), and the second end of the annular sealing portion (50) is interference-fitted in the groove of the second end cover (13).

14. The drum gear coupling according to claim 11, characterized in that: The annular sealing portion (50) comprises a frame (51), a sealing member (52) and a supporting member (53), wherein the sealing member (52) and the supporting member (53) are respectively connected to two sides of the frame (51), wherein the supporting member (53) is connected to the second end cover (13), and the sealing member (52) is in contact with the first arc-shaped surface (211).

15. The drum gear coupling according to claim 11, characterized in that: The inner circumference of the cylinder (11) is provided with a first step (111); the first limiting portion (30) is a cylindrical structure; the outer circumference of the first limiting portion (30) is provided with a second step (32); the second step (32) is limitedly matched with the first step (111).

16. The drum gear coupling according to claim 1, characterized in that: The end surface of the first limiting portion (30) abuts against the end surface of the inner tooth portion (12).

17. The drum gear coupling according to claim 1, characterized in that: The first limiting portion (30) is a cylindrical structure, and a sealing ring (41) is provided between the outer wall of the first limiting portion (30) and the inner wall of the cylinder (11).

18. The drum gear coupling according to claim 16, characterized in that: The drum gear coupling also includes: A clamping ring (42), a portion of which is embedded in the inner wall of the cylinder (11), and another portion of which is in contact with the end surface of the first limiting portion (30) away from the inner tooth portion (12).

19. The drum gear coupling according to claim 1, characterized in that: The first limiting portion (30) is a cylindrical structure, and the first limiting portion (30) has a first through hole (33).

20. The drum gear coupling according to claim 19, characterized in that: The cylinder (11) has a second through hole, the second through hole is connected to the first through hole (33), and the drum gear coupling further includes: A plug (43), wherein the plug (43) is used to block the second through hole.

21. The drum gear coupling according to claim 1, characterized in that: The extension portion (22) is provided with a third through hole (25), and the third through hole (25) is used to connect the cavities on both sides of the extension portion (22).

22. The drum gear coupling according to claim 1, characterized in that: An oil guide groove (214) is provided on the inner circumferential surface of the sleeve body (21) of the drum gear (20).

23. The drum gear coupling according to claim 1, characterized in that: The drum gear coupling also includes: The bushing (70) is arranged on the inner circumferential surface of the sleeve body (21), and the outer circumferential surface of the bushing (70) is interference-fitted with the inner circumferential surface of the sleeve body (21).

24. The drum gear coupling according to claim 1, characterized in that: The drum gear coupling comprises two sleeves (10), two drum gears (20) and two annular sealing parts (50), the two sleeves (10) are connected to each other, the two drum gears (20) are arranged in a one-to-one correspondence with the two sleeves (10), and the two annular sealing parts (50) are arranged in a one-to-one correspondence with the two sleeves (10).

25. The drum gear coupling according to claim 10, characterized in that: The annular sealing portion (50) comprises a frame (51) and a sealing member (52) vulcanized into one piece with the frame (51); the frame (51) is interference fit in a groove on the inner wall of the cylindrical member of the first end cover (62); and the sealing member (52) is in sliding contact with the first arcuate surface (211).

26. The drum gear coupling according to claim 13, characterized in that: The annular sealing portion (50) comprises a frame (51) and a sealing member (52) vulcanized into one piece with the frame (51); the frame (51) is interference fit in a groove of the second end cover (13); and the sealing member (52) is in sliding contact with the first arcuate surface (211).

27. A gear transmission system, characterized in that: The gear transmission system comprises a drum gear coupling as claimed in any one of claims 1 to 26, and the gear transmission system further comprises a transmission gearbox, wherein the input shaft of the transmission gearbox and the inner circumference of the sleeve (21) of the drum gear (20) of the drum gear coupling are in a conical interference fit.

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