Drum gear

Abstract

The present invention provides a drum gear, comprising: a sleeve, an extension and a drum gear portion, wherein the extension extends from one end of the sleeve to the other end of the sleeve, an annular gap with an opening is formed between the extension and the sleeve, the drum gear portion is arranged on the outer circumferential surface of the extension, the drum gear portion is used to cooperate with the inner gear portion in the drum coupling, and the outer circumferential surface of the sleeve has an arc surface, which is used to cooperate with the annular sealing portion in the drum coupling. The technical solution provided by the present invention can solve the problem of easy wear and vibration of the drum gear coupling in the prior art during operation.

Description

Technical Field

[0001] The invention relates to the technical field of couplings, and in particular to a drum gear. 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] As one of the main structures of the drum gear coupling, the drum gear has a direct impact on the performance of the drum gear coupling. In the above patents or other prior arts, when the drum gear of the drum gear coupling deflects relative to the housing, 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 to solve the problem of poor sealing performance of the drum gear coupling in the prior art.

[0011] In order to solve the above problems, the present invention provides a drum gear, comprising: a sleeve body, an extension portion and a drum-shaped tooth portion, the extension portion extends from one end of the sleeve body to the other end of the sleeve body, an annular gap with an opening is formed between the extension portion and the sleeve body, the drum-shaped tooth portion is arranged on the outer circumferential surface of the extension portion, the drum-shaped tooth portion is used to cooperate with the internal tooth portion in the drum coupling, the outer circumferential surface of the sleeve body has an arcuate surface, the arcuate surface is used to cooperate with the annular sealing portion in the drum coupling.

[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 arc surface is located on the central plane.

[0013] Furthermore, the 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 arc 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, wherein the extension portion is disposed around the first sleeve section and extends toward the second sleeve section, and the 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 extension portion includes a connecting section and an extending section, wherein two ends of the connecting section are respectively connected to the first sleeve section and the extending section, the annular gap is located between the extending section and the arc surface, and the drum-shaped tooth portion is located on the outer circumferential surface of the extending section.

[0018] Furthermore, a spherical surface is provided on the side of the extension portion facing away from the annular gap, the center of the spherical surface coincides with the center of the second spherical surface, and the spherical surface is used to cooperate with the limiting spherical surface in the drum coupling.

[0019] Furthermore, the extension portion includes a connecting section and an extension section, the two ends of the connecting section are respectively connected to the sleeve body and the extension section, the annular gap is located between the extension section and the sleeve body, the drum-shaped tooth portion is located on the outer circumferential surface of the extension section, the spherical surface is arranged at the connection between the connecting section and the extension section, and the spherical surface is located on the side of the connection away from the annular gap.

[0020] Furthermore, the extension portion includes a connecting section and an extension section, the two ends of the connecting section are respectively connected to the sleeve body and the extension section, the annular gap is located between the extension section and the sleeve body, the drum-shaped tooth portion is located on the outer circumferential surface of the extension section, and the spherical surface is located on the side of the connecting section away from the annular gap.

[0021] Furthermore, the extension portion includes a connecting section and an extension section, the two ends of the connecting section are respectively connected to the sleeve body and the extension section, the annular gap is located between the extension section and the sleeve body, the drum-shaped tooth portion is located on the outer circumferential surface of the extension section, and the extension portion also has a through hole, which is used to connect the cavities on both sides of the extension portion, and the through hole is arranged on the connecting section or the extension section.

[0022] Furthermore, an oil guide groove is provided on the inner wall of the sleeve body.

[0023] Furthermore, the oil guide groove is spirally wound around the inner wall of the sleeve body.

[0024] Furthermore, the sleeve body, the extension portion and the drum-shaped tooth portion are an integrally formed structure.

[0025] By applying the technical solution of the present invention, a drum-shaped tooth portion is provided on the extension portion of the drum-shaped gear, so that the drum-shaped gear can swing and move axially through the cooperation between the drum-shaped tooth portion and the internal tooth portion in the drum-shaped coupling. Since the outer peripheral surface of the sleeve of the drum-shaped gear has an arc surface, when the drum-shaped gear is deflected, the circumference of the annular sealing portion can be evenly contacted with the arc surface of the sleeve to seal. This can ensure that the drum gear has a good sealing effect at different positions, and on the other hand, the annular sealing portion is evenly worn, thereby improving the sealing effect and service life of the drum-shaped gear coupling during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] 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:

[0027] Figure 1 A schematic diagram of the structure of a drum gear provided in the first embodiment of the present invention is shown;

[0028] Figure 2 A schematic diagram of the structure of a drum gear provided in the second embodiment of the present invention is shown;

[0029] Figure 3 Shows Figure 1 Schematic diagram of the application of the drum gear in the drum gear coupling;

[0030] Figure 4 Shows Figure 2 Schematic diagram of the drum gear used in the drum gear coupling.

[0031] The above drawings include the following reference numerals:

[0032] 10. Sleeve; 12. Internal tooth portion; 21. Sleeve body; 211. Arc surface; 212. First sleeve section; 213. Second sleeve section; 214. Oil guide groove; 22. Extension portion; 221. Spherical surface; 222. Connecting section; 223. Extension section; 23. Drum-shaped tooth portion; 24. Annular gap; 25. Through hole; 50. Annular sealing portion. DETAILED DESCRIPTION

[0033] 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.

[0034] like Figure 1 As shown, embodiment 1 of the present invention provides a drum gear, including: a sleeve body 21, an extension portion 22 and a drum-shaped tooth portion 23, the extension portion 22 extends from one end of the sleeve body 21 to the other end of the sleeve body 21, and 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 arranged on the outer peripheral surface of the extension portion 22, and the drum-shaped tooth portion 23 is used to cooperate with the internal tooth portion in the drum coupling, and the outer peripheral surface of the sleeve body 21 has an arcuate surface 211, and the arcuate surface 211 is used to cooperate with the annular sealing portion in the drum coupling.

[0035] By applying the technical solution of the present invention, a drum-shaped tooth portion 23 is provided on the extension portion 22 of the drum gear, so that the drum gear can swing and move axially through the cooperation between the drum-shaped tooth portion 23 and the internal tooth portion in the drum coupling. Since the outer peripheral surface of the sleeve 21 of the drum gear has an arc surface 211, when the drum gear is deflected, the circumferential direction of the annular sealing portion can be evenly contacted and sealed with the arc surface 211 of the sleeve 21. In this way, on the one hand, it can ensure that the drum gear has a good sealing effect at different positions, and on the other hand, the wear of different parts of the annular sealing portion 50 is relatively uniform, thereby effectively improving the sealing effect and service life of the drum gear coupling during operation. In this embodiment, the drum-shaped tooth portion 23 is composed of a plurality of drum teeth.

[0036] 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 arc surface 211 is located on the center plane. In the initial state, one end of the annular sealing portion is in contact with the circumference of the highest point of the arc surface 211, so that when the drum gear deflects relative to the sleeve 10 of the drum coupling, the circumference of the annular sealing portion is always in contact with the arc surface 211 of the sleeve body 21, the elastic deformation is relatively less, and the sealing effect is better.

[0037] In this embodiment, the arc surface 211 can be set as a spherical surface. In this way, when the sleeve body 21 rotates, even if the position of the arc surface 211 in contact with the annular sealing part changes, the elastic deformation of the annular sealing part 50 will not change when the sleeve body 21 has no axial displacement; when the sleeve body 21 has axial displacement, different parts of the annular sealing part 50 in contact with the spherical surface will only undergo small uniform deformation. Therefore, through this technical solution, the different contact positions of the arc surface 211 and the annular sealing part 50 can achieve good sealing, and the wear of different contact parts of the annular sealing part 50 is uniform, so that the sealing effect and service life of the drum gear coupling during operation can be significantly improved. The spherical surface in this embodiment is not a complete spherical surface, and can be understood as a partial annular spherical surface.

[0038] 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 arc surface 211 coincides with the center of the second spherical surface. Through the above arrangement, when the drum gear 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, and further extending the service life of the drum gear coupling.

[0039] In this embodiment, the sleeve body 21 includes a first sleeve section 212 and a second sleeve section 213 connected in sequence, wherein the extension portion 22 is disposed around the first sleeve section 212 and extends toward the second sleeve section 213, and the 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 geometric structure shape reasonably, and it is convenient to arrange the drum-shaped tooth portion 23 and the overall geometric structure and shape of the drum-shaped tooth coupling reasonably, the structure is compact, and it can ensure that the drum gear has sufficient strength and is convenient for processing and testing.

[0040] In this embodiment, the extension portion 22 includes a connecting section 222 and an extending section 223, wherein both ends of the connecting section 222 are respectively connected to the first sleeve section 212 and the extending section 223, the annular gap 24 is located between the extending section 223 and the arc surface 211, and the drum-shaped tooth portion 23 is located on the outer circumferential surface of the extending section 223. This facilitates the formation of the annular gap 24 and the arrangement of the drum-shaped tooth portion 23.

[0041] In this embodiment, a spherical surface 221 is provided on the side of the extension portion 22 that is away from the annular gap 24, and the center of the spherical surface 221 coincides with the center of the second spherical surface, and the spherical surface 221 is used to cooperate with the limiting spherical surface in the drum coupling. Through the above arrangement, the two spherical surfaces are used to cooperate when limiting, which will not affect the meshing of the drum tooth portion 23 and the internal tooth portion 12 in the sleeve 10, increase the contact area of ​​the limiting area, reduce the force per unit area, and do not generate additional torque, thereby avoiding aggravating the wear or vibration of the sleeve 10 and the drum gear when limiting, and improving the stability and service life of the drum gear coupling during operation.

[0042] Specifically, in this embodiment, the extension portion 22 includes a connecting section 222 and an extending section 223, the two ends of the connecting section 222 are connected to the sleeve body 21 and the extending section 223 respectively, the annular gap 24 is located between the extending section 223 and the sleeve body 21, the drum-shaped tooth portion 23 is located on the outer circumferential surface of the extending section 223, the spherical surface 221 is arranged at the connection between the connecting section 222 and the extending section 223, and the spherical surface 221 is located at the side of the connection away from the annular gap 24. In this way, the extending section 22 is convenient to contact with other components to limit the extending section 22.

[0043] In this embodiment, the extension portion 22 includes a connecting section 222 and an extension section 223, the two ends of the connecting section 222 are connected to the sleeve 21 and the extension section 223 respectively, the annular gap 24 is located between the extension section 223 and the sleeve 21, the drum-shaped tooth portion 23 is located on the outer peripheral surface of the extension section 223, and the extension portion 22 also has a through hole 25, the through hole 25 is used to connect the cavities on both sides of the extension portion 22, and the through hole 25 is arranged on the connecting section 222 or the extension section 223. 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-shaped tooth coupling to run unsteadily. After the cavities on both sides of the extension portion 22 are connected by the through hole 25, the pressure in different cavities can be balanced, thereby avoiding the harm of unsteady operation to the drum-shaped tooth coupling. Moreover, the lubricating medium in the cavities on both sides of the extension portion 22 can also flow through the through hole 25, so that the distribution of the lubricating medium is more uniform, thereby improving the lubrication effect.

[0044] In this embodiment, the inner wall of the sleeve body 21 is provided with an oil guide groove 214. Thus, 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.

[0045] Specifically, the oil guide groove 214 is spirally wound around the inner wall of the sleeve 21. This can increase the oil film area on the inner wall of the sleeve 21 and further reduce the friction between the shaft components and the sleeve 21.

[0046] In this embodiment, the sleeve 21, the extension 22 and the drum gear 23 are an integrally formed structure. Preferably, they are integrally formed by forging, that is, a forging blank of the drum gear is first manufactured, and then the drum gear 23 is machined to obtain the drum gear. Other molding manufacturing processes may also be used. This can increase the structural strength of the drum gear. Of course, the drum gear may also be set as a split structure as required.

[0047] like Figure 2 As shown, in the second embodiment of the present invention, different from the first embodiment, the extension part 22 includes a connecting section 222 and an extending section 223, the two ends of the connecting section 222 are respectively connected to the sleeve body 21 and the extending section 223, the annular gap 24 is located between the extending section 223 and the sleeve body 21, the drum-shaped tooth part 23 is located on the outer peripheral surface of the extending section 223, and the spherical surface 221 is located on the side of the connecting section 222 away from the annular gap 24. In this way, it is convenient for the extending section 22 to contact with other components to limit the extending section 22. And the drum gear can have a higher strength.

[0048] By applying the technical solution of the present invention, a drum-shaped tooth portion 23 is provided on the extension portion 22 of the drum-shaped gear, so that the drum-shaped gear can swing and move axially through the cooperation between the drum-shaped tooth portion 23 and the internal tooth portion in the drum-shaped coupling. Since the outer peripheral surface of the sleeve 21 of the drum-shaped gear has an arc surface 211, when the drum-shaped gear deflects, the circumferential direction of the annular sealing portion can be evenly contacted with the arc surface 211 of the sleeve 21 for sealing. In this way, on the one hand, it can ensure that the drum-shaped gear has a good sealing effect at different positions, and on the other hand, the annular sealing portion 50 is evenly worn, thereby improving the sealing effect and service life of the drum-shaped gear coupling during operation.

[0049] 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, characterized in that: include: A sleeve body (21), an extension portion (22) and a drum-shaped tooth portion (23), wherein the extension portion (22) extends from one end of the sleeve body (21) to the other 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 arranged on the outer peripheral surface of the extension portion (22), the drum-shaped tooth portion (23) is used to cooperate with the internal tooth portion in the drum coupling, and the outer peripheral surface of the sleeve body (21) has an arcuate surface (211), and the arcuate surface (211) is used to cooperate with the annular sealing portion in the drum coupling; The arcuate surface (211) is a spherical surface, 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 arcuate surface (211) coincides with the center of the second spherical surface; A spherical surface (221) is provided on the side of the extension portion (22) facing away from the annular gap (24), the center of the spherical surface (221) coincides with the center of the second spherical surface, and the spherical surface (221) is used to cooperate with a limiting spherical surface in the drum coupling.

2. The drum gear 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 arc-shaped surface (211) is located on the central plane.

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

4. The drum gear according to claim 3, 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.

5. The crown gear according to claim 3, characterized in that: The extension portion (22) comprises a connecting section (222) and an extension section (223), wherein two ends of the connecting section (222) are respectively connected to the first sleeve section (212) and the extension section (223), the annular gap (24) is located between the extension section (223) and the arcuate surface (211), and the drum-shaped tooth portion (23) is located on the outer peripheral surface of the extension section (223).

6. The drum gear according to claim 1, characterized in that: The extension portion (22) comprises a connecting section (222) and an extension section (223); two ends of the connecting section (222) are respectively connected to the sleeve body (21) and the extension section (223); the annular gap (24) is located between the extension section (223) and the sleeve body (21); the drum-shaped tooth portion (23) is located on the outer peripheral surface of the extension section (223); the spherical surface (221) is arranged at the connection between the connecting section (222) and the extension section (223); and the spherical surface (221) is located on a side of the connection away from the annular gap (24).

7. The drum gear according to claim 1, characterized in that: The extension portion (22) comprises a connecting section (222) and an extension section (223); two ends of the connecting section (222) are respectively connected to the sleeve body (21) and the extension section (223); the annular gap (24) is located between the extension section (223) and the sleeve body (21); the drum-shaped tooth portion (23) is located on the outer peripheral surface of the extension section (223); and the spherical surface (221) is located on a side of the connecting section (222) away from the annular gap (24).

8. The drum gear according to claim 1, characterized in that: The extension portion (22) comprises a connecting section (222) and an extension section (223); two ends of the connecting section (222) are respectively connected to the sleeve body (21) and the extension section (223); the annular gap (24) is located between the extension section (223) and the sleeve body (21); the drum-shaped tooth portion (23) is located on the outer peripheral surface of the extension section (223); the extension portion (22) further comprises a through hole (25); the through hole (25) is used to connect cavities on both sides of the extension portion (22); the through hole (25) is arranged on the connecting section (222) or on the extension section (223).

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

10. The crown gear according to claim 9, characterized in that: The oil guide groove (214) is spirally wound around the inner wall of the sleeve body (21).

11. The crown gear according to claim 1, characterized in that: The sleeve body (21), the extension portion (22) and the drum-shaped tooth portion (23) are an integrally formed structure.

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