Flange fork structure of universal coupling

Abstract

The utility model discloses a flange fork structure of a universal coupling, and belongs to the technical field of transmission devices. The fork head comprises a fork head body and a flange plate, wherein the fork head body and the flange plate are mutually inserted through a male spigot and a female spigot; the peripheral walls of the spigot end faces of the male spigot and the female spigot are respectively provided with a notch, the two notches are combined to form an annular welding seam, and the depth of the notches is smaller than the thickness of the spigot end faces. According to the flange fork structure of the universal coupling, the fork head body and the flange plate are of a split structure, and compared with a traditional integrated structural design, the end, provided with the cavity, of the fork head body is standardized, and the other end of the fork head body can be connected with the flange plates of various structural forms; therefore, the diameter, the thickness and the center height of the flange plate can be designed according to customer requirements. And the whole flange fork does not need to be re-cast, so that the production period and the production cost can be reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of transmission devices, and more specifically, relates to a flange fork structure of a universal coupling. Background Technique

[0002] The universal coupling makes use of the characteristics of its mechanism to enable two shafts that are not on the same axis and have an angular axis to achieve continuous rotation of the two connected shafts and reliably transmit torque and motion. The biggest feature of the universal coupling is that its structure has a large angular compensation ability, is compact in structure, and has high transmission efficiency.

[0003] The flange fork head, as an important part of the cross-axis universal coupling, plays an important role in power transmission and angle compensation. The flange fork head generally includes a base and a pair of arms symmetric about the rotation center line. Two coaxial shaft holes are provided in the middle of each arm, and a retaining edge extends inward at the middle position inside the lower part of the shaft hole. This structure not only enhances the bearing capacity of the coupling but also improves the service life of the cross-axis universal coupling. However, the existing flange forks are usually designed with an integral structure. The flange diameter and center height dimensions corresponding to each specification of the flange fork are fixed, and the thickness of the flange plate can only be reduced. If it is necessary to increase the flange diameter, increase the center height, or increase the flange thickness, new molds need to be developed, which not only increases the cost but also has a long processing cycle.

[0004] After retrieval, relevant patents on flange fork heads have been publicly disclosed, and the applicant has been committed to the R & D design and structural optimization of flange fork heads. For example, in the patent of CN215110167U applied by the applicant before, an improved fork head cavity structure is disclosed. In this application case, the cavity is optimized on the basis of the traditional fork head structure. The multiple curved surfaces of the original cavity are optimized into a small number of curved surfaces and planes, and at the same time, the internal corners of the fork part cavity are removed. In the patent of CN115962231A, an integral universal coupling flange fork head and its manufacturing method are disclosed. In this application case, a transition layer is formed at the connection between the flange plate and the fork head body, so that the flange plate and the fork head body form an integral structure, making the end face teeth have high wear resistance.

[0005] The above application cases are all about the technical improvement of the flange fork head, but the defects caused by the integral structure of the flange fork head have not been effectively solved. Content of the Utility Model

[0006] 1. Problems to be Solved

[0007] In view of at least some of the problems existing in the above-mentioned prior art, the present utility model provides a universal coupling flange fork structure, aiming to solve the problems of long production cycle and high cost in the existing integral flange fork structure when it is necessary to increase the flange diameter, center height or flange thickness.

[0008] 2. Technical solutions

[0009] To solve the above problems, the technical solutions adopted by the present utility model are as follows:

[0010] A universal coupling flange fork structure of the present utility model includes a fork head body and a flange plate. The fork head body and the flange plate are inserted into each other through male and female spigots.

[0011] On the outer peripheral wall of the end faces of the male and female spigots, a notch is respectively opened. After the two notches are combined, a circumferential weld is formed, and the depth of the notch is less than the thickness of the end face of the spigot.

[0012] Furthermore, an interference fit is adopted between the mating surfaces of the male and female spigots.

[0013] Furthermore, the end faces of the male and female spigots are mutually attached, and the fit tolerance between the mating surfaces of the male and female spigots is H8 / s7.

[0014] Furthermore, the opening depths of the male and female spigots are different, and a gap is left between the end faces of the two. The gap is communicated with the circumferential weld to form a penetrant weld.

[0015] Furthermore, the fit tolerance between the mating surfaces of the male and female spigots is H8 / p7.

[0016] Furthermore, the gap between the end faces of the male and female spigots is 2 - 3 mm.

[0017] Furthermore, the cross-section of the circumferential weld is a U-shaped groove, and the opening depth H1 of the circumferential weld is 2 - 3 mm smaller than the length L1 of the end face of the spigot.

[0018] Furthermore, the material of the fork head body is any one of ZG35CrMo and 42CrMo, and the material of the flange plate is any one of 40Cr / 45, 42CrMo, and 42CrMo.

[0019] Furthermore, the fork head body and the flange plate are made of different materials.

[0020] Furthermore, the interface form of the flange plate is any one of end face key form, end face tooth form, jaw clutch form, or flange shaft form.

[0021] 3. Beneficial effects

[0022] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0023] (1) For the universal coupling flange fork structure of the present utility model, a split structure is adopted between the fork head body and the flange plate. Compared with the traditional integral structure design, one end of the fork head body with a cavity is standardized, and the other end can be connected to flange plates of various structural forms, so that the dimensions of the flange plate diameter and center height can be designed according to customer requirements. There is no need to recast the entire flange fork, thereby reducing the production cycle and production cost. At the same time, the split design can also achieve different material combinations for the fork head body and the flange plate according to actual production needs. In addition, the male and female stop mouths are in mutual cooperation, and with the setting of the circumferential weld, the connection strength between the fork head body and the flange plate can be ensured.

[0024] (2) For the universal coupling flange fork structure of the present utility model, the end faces of the male and female stop mouths are mutually attached, and the fit tolerance between the mating surfaces of the male and female stop mouths is H8 / s7; this results in a certain interference fit between the male and female stop mouths, and combined with the circumferential weld, it is beneficial to improve the connection strength between the fork head body and the flange plate.

[0025] (3) For the universal coupling flange fork structure of the present utility model, a gap is left between the end faces of the male and female stop mouths, and this gap is connected to the circumferential weld to form a penetrant weld, which can effectively improve the welding strength between the fork head body and the flange plate, thereby appropriately reducing the interference fit amount between the male and female stop mouths to facilitate assembly.

[0026] (4) For the universal coupling flange fork structure of the present utility model, the end of the fork head body is a female stop mouth, and the end of the flange plate is a male stop mouth, so that the inner hole of the flange plate will not be occupied, thus leaving sufficient assembly space for the later assembly of the spline sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is the first structural schematic diagram of the universal coupling flange fork structure of the present utility model;

[0028] Figure 2 is Figure 1 the enlarged structural schematic diagram of part A in

[0029] Figure 3 is another embodiment of the first structure of the universal coupling flange fork structure of the present utility model;

[0030] Figure 4 is the second structural schematic diagram of the universal coupling flange fork structure of the present utility model;

[0031] Figure 5 isFigure 4 Schematic enlarged view of the structure at B in the [device];

[0032] Figure 6 Another embodiment of the second structure of the flange fork structure of the universal coupling of the present utility model;

[0033] Figure 7 Schematic structural view of the fit between the male and female stop mouths in the present utility model.

[0034] In the figure: 1, fork head body; 2, flange; 31, stop mouth end face; 32, stop mouth mating surface; 4, circumferential weld. Specific embodiments

[0035] To further understand the content of the present utility model, the present utility model will be described in detail with reference to the accompanying drawings.

[0036] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0037] The present utility model will be further described below with reference to specific embodiments.

[0038] As Figure 1 、 2 shown, a flange fork structure of a universal coupling in this embodiment includes a fork head body 1 and a flange 2 that are welded to each other; wherein, the fork head body 1 and the flange 2 are inserted into each other through male and female stop mouths, and a notch is provided on the outer peripheral wall of the stop mouth end face 31 of the male and female stop mouths. Of course, the depth H1 of the notch needs to be less than the length L1 of the stop mouth end face 31, and the two notches are combined to form a circumferential weld 4. Preferably, the cross-section of the circumferential weld 4 is in a U-shaped groove shape, and the difference between the length L1 of the stop mouth end face 31 and the depth H1 of the notch is about 2-3 mm.

[0039] As the first implementation mode of the flange fork structure of a universal coupling in this embodiment, in this embodiment, the mating surfaces 32 of the male and female stop bores are designed to be mutually fitted. At the same time, for the convenience of the following description, the end of the fork head body 1 for plugging and mating with the flange 2 is denoted as the first end; the end of the flange 2 for plugging and mating with the fork head body 1 is denoted as the second end, and the other end of the flange 2 for connecting with the universal shaft is denoted as the third end. Among them, the first end can be a male stop bore or a female stop bore, and the second end is a female stop bore or a male stop bore that cooperates with the first end; the interface form of the third end can be any one of the end face key form, end face tooth form, spline form or flange shaft form.

[0040] Specifically, referring to Figure 2 As shown, as a matching form of the first end and the second end. The first end of the fork head body 1 is provided with a male stop bore, and the second end of the flange 2 is provided with a mating female stop bore. After assembly, the end faces 31 of the male and female stop bores are fitted. At the same time, an interference fit is adopted between the mating surfaces 32 of the male and female stop bores to further ensure the connection strength between the fork head body 1 and the flange 2. Preferably, the fit tolerance between the mating surfaces 32 of the male and female stop bores is H8 / s7.

[0041] Of course, the first end and the second end can also adopt Figure 3 The matching form, that is, the first end of the fork head body 1 is provided with a female stop bore, and the second end of the flange 2 is provided with a mating male stop bore. After assembly, the end faces 31 of the male and female stop bores also fit each other, and an interference fit is also adopted between the mating surfaces 32 of the male and female stop bores. The advantage of such a matching form is that since the male stop bore is provided at the second end of the flange 2, it does not occupy the inner hole space of the flange 2, thus leaving enough assembly space for the later assembly of the spline sleeve.

[0042] At the same time, it should be noted that the above-mentioned end face 31 of the stop bore refers to the end face of the fork head body 1 and the flange 2 provided with the male or female stop bore, and the mating surface 32 of the stop bore refers to the peripheral wall where the male and female stop bores are mutually engaged. Specifically, referring to Figure 7 As shown, for the male stop bore, the starting surface of its boss is the end face 31 of the stop bore, and the outer peripheral wall of the boss is the mating surface 32 of the stop bore; for the female stop bore, the starting surface of its groove is the end face 31 of the stop bore, and the inner peripheral wall of the groove is the mating surface 32 of the stop bore; and the opening depth of the female stop bore groove is denoted as H2, and the opening depth (extension height) of the male stop bore boss is denoted as H3.

[0043] As the second implementation mode of the flange fork structure of a universal coupling in this embodiment, the opening depths of the male and female stop bores are different, that is Figure 7The values of H3 and H2 are different so that there is a gap between the mating surfaces 31 of the male and female rabbets. At the same time, this gap communicates with the circumferential weld 4, thereby forming a penetrant weld. That is, the circumferential weld 4 can extend to the outer peripheral wall of the male rabbet through the gap between the mating surfaces 31, thus improving the welding strength.

[0044] Specifically, referring to Figure 4 、 Figure 5 As shown, in order to leave enough assembly space for the later assembly of the spline sleeve, a female rabbet is provided on the first end of the fork head body 1, and a mating male rabbet is provided on the second end of the flange 2, and H3 is greater than H2. At this time, the male rabbet is inserted into the female rabbet. After being limited by the top of the male rabbet boss and the bottom of the female rabbet groove, a gap communicating with the circumferential weld 4 can be formed between the mating surfaces 31 of the male and female rabbets.

[0045] Preferably, the gap between the mating surfaces 31 of the male and female rabbets is 2 - 3 mm. That is, the opening depth H3 of the male rabbet is greater than the opening depth H2 of the female rabbet, and the difference is 2 - 3 mm. At the same time, an interference fit with a fit tolerance of H8 / p7 can be adopted between the mating surfaces 32 of the male and female rabbets.

[0046] In this embodiment, due to the existence of the penetrant weld, the connection strength between the fork head body 1 and the flange 2 can be effectively improved. At this time, the interference amount between the mating surfaces 32 of the male and female rabbets can be appropriately reduced to facilitate assembly.

[0047] Referring to Figure 6 As shown, to meet the requirement of the later spline sleeve assembly space, a male rabbet can also be provided on the first end of the fork head body 1, and a mating female rabbet is provided on the second end of the flange 2.

[0048] In a universal coupling flange fork structure of this embodiment, a gap is left between the mating surfaces 31 of the male and female rabbets, and this gap communicates with the circumferential weld 4 to form a penetrant weld. Compared with the design method where the mating surfaces 31 are in mutual contact, the penetrant weld can further improve the welding strength, so that an interference fit with a smaller interference amount of the male and female rabbets can meet the requirement of the connection strength between the fork head body 1 and the flange 2, thus facilitating the assembly operation between the male and female rabbets.

[0049] At the same time, it should be noted that in the above embodiment, although an interference fit is adopted between the mating surfaces 32 of the male and female rabbets, when the welding strength can ensure the connection strength between the fork head body 1 and the flange 2, a clearance fit can also be adopted between the mating surfaces 32 of the male and female rabbets to further facilitate the assembly operation between the male and female rabbets.

[0050] A universal coupling flange fork structure according to this embodiment adopts a split welding structure between the fork head body 1 and the flange 2. Compared with the traditional integral structure design, one end of the fork head body 1 with a cavity is standardized, and the other end can be connected to flanges of various structural forms, so that the diameters, thicknesses, and center heights of the flanges 2 can be designed according to customer requirements. There is no need to recast the entire flange fork, thus reducing the production cycle and production cost. At the same time, by using the male and female rabbets to cooperate with each other, together with the setting of the circumferential weld 4, the connection strength between the fork head body 1 and the flange 2 can be ensured.

[0051] In addition, the split welding design of this embodiment can also realize combinations of different materials for the fork head body 1 and the flange 2 according to actual production requirements. Among them, the material of the fork head body 1 can be any one of ZG35CrMo and 42CrMo, and the material of the flange 2 can be any one of 40Cr / 45, 42CrMo, and 42CrMo.

[0052] The above schematically describes the present invention and its implementation manners. This description is not restrictive, and only one of the implementation manners of the present invention is shown in the drawings. The actual structure is not limited thereto. Therefore, if those of ordinary skill in the art are inspired by it and, without departing from the gist of the present invention, design similar structural manners and embodiments to this technical solution without creative efforts, they shall fall within the protection scope of the present invention.

Claims

1. A universal coupling flange fork structure, comprising a fork head body (1) and a flange plate (2), characterized in that: The fork head body (1) and the flange (2) are inserted into each other through male and female rabbets; A notch is formed on the outer peripheral wall of the rabbet end face (31) of each of the male and female rabbets. After the two notches are combined, a circumferential weld (4) is formed, and the depth of the notch is less than the thickness of the rabbet end face (31).

2. The universal coupling flange fork structure according to claim 1, characterized in that: An interference fit is adopted between the rabbet mating surfaces (32) of the male and female rabbets.

3. The universal coupling flange fork structure according to claim 2, wherein: The rabbet end faces (31) of the male and female rabbets are mutually attached, and the fit tolerance between the rabbet mating surfaces (32) of the male and female rabbets is H8 / s7.

4. A universal coupling flange fork structure according to claim 2, characterized in that: The opening depths of the male and female rabbets are different, and a gap is left between the rabbet end faces (31) of the two. The gap is communicated with the circumferential weld (4) to form a penetrant weld.

5. A universal coupling flange fork structure according to claim 4, characterized in that: The fit tolerance between the rabbet mating surfaces (32) of the male and female rabbets is H8 / p7.

6. A universal coupling flange fork structure according to claim 5, characterized in that: The gap between the rabbet end faces (31) of the male and female rabbets is 2 - 3 mm.

7. A universal coupling flange fork structure according to any one of claims 1-6, characterized in that: The cross-section of the circumferential weld (4) is a U-shaped groove, and the opening depth H1 of the circumferential weld (4) is 2 - 3 mm smaller than the length L1 of the rabbet end face (31).

8. A universal coupling flange fork structure according to claim 7, characterized in that: The material of the fork head body (1) is any one of ZG35CrMo and 42CrMo, and the material of the flange (2) is any one of 40Cr / 45, 42CrMo, and 42CrMo.

9. A universal coupling flange fork structure according to claim 7, characterized in that: The fork head body (1) and the flange (2) are made of different materials.

10. A universal coupling flange fork structure according to claim 9, characterized in that: The interface form of the flange (2) is any one of the end face key form, the end face tooth form, the jaw clutch form, or the flange shaft form.

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