Combined sealing structure for outer half shaft of hub reduction steering driving front axle

Abstract

The utility model discloses a hub reduction steering drive front axle outer half shaft combined sealing structure, which relates to the technical field of automobile parts, and comprises a shell, a support, a steering ball cage, a shaft tube and an axle housing, and the shell and the support are oppositely arranged and form an accommodating space for accommodating the steering ball cage; the shaft tube is connected with the shell, and the outer driving half shaft in the shaft tube penetrates through the shell and then is connected with one end of the steering ball cage; the axle housing is connected with the support, and an inner driving half shaft in the axle housing penetrates through the support and then is connected with the other end of the steering ball cage; the combined type sealing device further comprises a combined type sealing device body, a mounting groove is formed in a port of the inner side of the shaft tube, and the combined type sealing device body is mounted in the mounting groove in a threaded mode and provided with an oil seal structure matched with the outer driving half shaft.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of automobile parts, and specifically relates to a wheel end reduction steering drive front axle outer half shaft combined sealing structure. BACKGROUND

[0002] The automobile front drive axle refers to a transmission device for transmitting power from an engine to front wheels and is responsible for the steering function of the automobile and the requirement of bearing the weight of the whole vehicle. The front drive vehicle with wheel end reduction is especially suitable for use in special working conditions such as wet and slippery road surface, heavy load climbing and starting, and the like. The vehicle is not easy to slip, starts stably, has good speed reduction and torque increasing effect, and can obtain faster starting acceleration capacity. Since the main reducer with wheel end reduction is very small and the axle has large ground clearance, the vehicle has strong off-road performance, passing performance and adaptability, and is favored by users. Due to the special performance requirement, the structure of the wheel end reduction front drive axle is relatively complex, the space is extremely compact, and there are many transmission parts. Therefore, the matching size of each related part is strictly required, and the assembly technology and reliability are required to be particularly high.

[0003] When the wheel end reduction front drive axle works, the support is connected and fixed with the axle housing through the fixing bolt, and the shaft tube is connected with the housing to form a shaft tube assembly. When the automobile steers, the shaft tube assembly rotates along the pin shaft on the support, and simultaneously drives the outer drive half shaft to rotate around the pin shaft of the steering ball cage to realize steering. The power of the main reducer drives the wheel end assembly through the inner drive half shaft, the steering ball cage and the outer drive half shaft to realize the running of the automobile. The steering ball cage has the dual functions of power transmission and steering. The sealing performance of the outer drive half shaft and the shaft tube is the key to the performance of the wheel end reduction front drive axle. At present, the conventional scheme is that the oil seal seat is formed by stamping a steel plate with a thickness of about 1.5 mm, a single oil seal is pressed into the oil seal seat, and then sealing glue and fastening glue are applied to the outer circle of the oil seal seat, and the oil seal seat is pressed into the shaft tube as a whole. The sealing between the outer circle of the oil seal seat and the shaft tube is realized by relying on the sealing glue, the fastening glue and the pressing interference. The sealing effect is very poor, and mass oil leakage quality accidents often occur. Moreover, when the oil seal and other parts need to be replaced, the oil seal seat cannot be removed, and the oil seal, the oil seal seat and the shaft tube need to be damaged, which causes great waste and consumes time and effort. Since the outer drive half shaft has different degrees of axial transmission and radial jumping during steering and power transmission, the oil seal seat is formed by stamping a thin steel plate and has low strength and is easy to deform, and is extremely easy to leak oil from the outer circle of the oil seal seat. At the same time, when the oil seal seat is pressed into the shaft tube, the pressing force is limited, and when the axle steers, the outer drive half shaft will displace in the axial direction, and the oil seal seat and the oil seal are very easy to be pulled out of the shaft tube hole, causing complete sealing failure. The wheel end gear oil is quickly leaked, the whole wheel end assembly is completely burned, great loss is caused, and the automobile cannot run. SUMMARY

[0004] The wheel edge reduction steering drive front axle outer half shaft combined sealing structure can completely solve the oil leakage problem, is simple and easy to operate, safe and reliable, convenient to disassemble, simple and practical, and has very good use effect.

[0005] To achieve the above object, the utility model takes the technical scheme: a wheel edge reduction steering drive front axle outer half shaft combined sealing structure, including casing, support, steering ball cage, axle pipe and axle housing, the casing and the support are opposite and form the containing space for containing the steering ball cage, the axle pipe is connected with the casing, and the outer drive half shaft in the axle pipe is connected with one end of the steering ball cage after passing through the casing, the axle housing is connected with the support, and the inner drive half shaft in the axle housing is connected with the other end of the steering ball cage after passing through the support, and it further includes combined sealing device, the inside port of axle pipe is provided with the mounting groove, the combined sealing device is screwed in the mounting groove, and the combined sealing device is provided with the oil seal structure that adapts to the outer drive half shaft.

[0006] Further improvement lies in that: the inner wall of the mounting groove is provided with internal threads, and the combined sealing device includes an oil seal seat and an oil seal structure.

[0007] Further improvement lies in that: the part of the ring-shaped body outside the mounting groove is provided with a fixing groove, the fixing groove is adapted to a sleeve wrench, and is used for fixing and tightening the oil seal seat.

[0008] Further improvement lies in that: the part of the ring-shaped body outside the mounting groove is provided with an annular tool withdrawal groove.

[0009] Further improvement lies in that: the oil seal structure is a combined double oil seal.

[0010] Further improvement lies in that: the casing and the support are both in U-shaped structure, the casing includes two first prongs, and the support includes two second prongs; the two second prongs are located between the two first prongs and are connected with the corresponding first prongs through the pin shafts, and the steering ball cage is arranged between the two second prongs.

[0011] Further improvement lies in that: the axle pipe is fixedly connected with the casing through a first fixing bolt, and the axle housing is fixedly connected with the support through a second fixing bolt.

[0012] Further improvement lies in that: the axle pipe is internally provided with a cavity adapted to the outer drive half shaft, and the inside end of the axle pipe is provided with a flange adapted to the casing.

[0013] Further improvement lies in that the oil seal structure is uniformly smeared with lubricating oil at the blade contact position; and the outer side end face and outer thread of the annular body are uniformly smeared with sealing glue.

[0014] Further improvement lies in that the combined sealing device is further provided with a press-fitting tool, which comprises a cylindrical body, the end of the cylindrical body is outwardly bent to form a flange, and the flange is provided with a press-fitting protrusion for abutting against the oil seal structure.

[0015] The utility model discloses beneficial effect lies in:

[0016] 1. In the utility model, the oil seal seat is made of a round pipe, an outer thread is formed at the front end of the outer circle, and a uniformly distributed groove is formed at the tail end of the outer circle. The groove is slowly tightened by a special sleeve wrench. When the oil seal seat is installed, sealing glue is uniformly applied to the outer thread and the outer end face of the oil seal seat. The fastening glue is removed. The double sealing of fine thread sealing and sealing glue sealing is adopted, which has better effect and is more reliable.

[0017] 2. In the utility model, the oil seal seat and the shaft pipe are connected by screw threads instead of being directly pressed in. The oil seal seat will not be pulled out when the outer driving half shaft moves. The screw thread connection is reliable and firm, and is easy to disassemble, replace and maintain parts.

[0018] 3. In the utility model, the conventional single oil seal is replaced by a combined double oil seal, the contact area between the inner hole blade of the combined double oil seal and the outer circle of the outer driving half shaft is increased, and the contact area of the sealing blade is relatively large when the outer driving half shaft moves axially and radially during steering and driving. The sealing effect of the combined double oil seal is much better than that of the single oil seal, and double sealing is realized.

[0019] 4. In the utility model, when the combined sealing device is installed, the combined double oil seal is first pressed into the oil seal seat hole by a special tool and equipment to ensure that it is pressed into place. Then, the outer thread and the end face of the pressed oil seal seat assembly are uniformly smeared with sealing glue. The assembly is screwed in a few threads by hand, and then slowly tightened into place by a special wrench. A certain pressing force needs to be ensured to achieve sufficient sealing performance. DRAWINGS

[0020] Figure 1 It is a structural schematic view of the combined sealing structure of the outer half shaft of the wheel edge reduction steering drive front axle in the utility model embodiment.

[0021] Figure 2 It is a sectional view of the combined sealing structure of the outer half shaft of the wheel edge reduction steering drive front axle in the utility model embodiment.

[0022] Figure 3 It is an installation schematic view of the combined sealing device in the utility model embodiment.

[0023] Figure 4 It is a structure schematic view of the shaft pipe in the embodiment of the utility model;

[0024] Figure 5 It is a structure schematic view of the combined sealing device in the embodiment of the utility model;

[0025] Figure 6 It is a structure schematic view of the oil seal seat in the embodiment of the utility model;

[0026] Figure 7 It is the front view of the oil seal seat in the embodiment of the utility model;

[0027] Figure 8 It is the installation schematic view of the press fitting tool in the embodiment of the utility model.

[0028] Reference signs:

[0029] 1 - shell; 11 - first fork arm; 12 - pin shaft;

[0030] 2 - support; 21 - second fork arm;

[0031] 3 - shaft pipe; 31 - cavity; 32 - flange; 33 - installation groove; 34 - internal thread; 35 - first fixing bolt;

[0032] 4 - axle housing; 41 - second fixing bolt;

[0033] 5 - outer drive half shaft;

[0034] 6 - inner drive half shaft;

[0035] 7 - steering ball cage;

[0036] 8 - combined sealing device; 81 - oil seal seat; 811 - annular body; 812 - limiting baffle; 813 - through hole; 814 - external thread; 815 - fixing groove; 816 - annular relief groove; 82 - oil seal structure;

[0037] 9 - press fitting tool; 91 - cylindrical body; 92 - flange part; 93 - press fitting protrusion. DETAILED DESCRIPTION

[0038] The embodiments of the utility model are described in detail below, and the embodiment examples are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout.

[0039] In the description of the utility model, it is necessary to explain that, for the direction words, if the terms "center", "transverse (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation and positional relationship based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the utility model and simplifying the description, and not indicating or implying that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and cannot be understood as limiting the specific protection scope of the utility model.

[0040] In addition, if the terms "first", "second" are only used for description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. Therefore, the "first", "second" features can be explicitly or implicitly included one or more features, and in the description of the utility model, the meaning of "several", "several" is two or more than two, unless otherwise explicitly specified.

[0041] The technical scheme of the utility model and its beneficial effects are more clear and explicit by further describing the specific embodiments of the utility model in combination with the drawings of the specification. The embodiments described below by referring to the drawings are exemplary and are intended to explain the utility model, and cannot be understood as limiting the utility model.

[0042] Referring to Figure 1 And Figure 2 As shown in the utility model embodiment provides a kind of wheel edge reduction steering drive front axle outer half shaft combination formula sealing structure, including shell 1, support 2, steering ball cage 7, axle tube 3 and axle housing 4, shell 1 and support 2 are oppositely arranged and form the containing space for containing steering ball cage 7;Axle tube 3 is connected with shell 1, and outer drive half shaft 5 in axle tube 3 is connected with one end of steering ball cage 7 after passing through shell 1;Axle housing 4 is connected with support 2, and inner drive half shaft 6 in axle housing 4 is connected with the other end of steering ball cage 7 after passing through support 2;It also includes combination formula sealing device 8, the inner side port of axle tube 3 is provided with installation groove 33, combination formula sealing device 8 is screwed in installation groove 33, and combination formula sealing device 8 is provided with the oil seal structure 82 compatible with outer drive half shaft 5.Due to the limited space between the inner cavity of the shell of the installation axle tube and steering ball cage, under the premise of ensuring that interference does not occur when steering, the height of the oil seal seat is increased as much as possible to ensure that combination formula double oil seal and processing wrench height groove can be installed, and at the same time, when combination formula double oil seal is pressed into place, the gap between the end face of combination formula double oil seal and the hole face of axle tube is 2-3mm to prevent the deformation and damage of the lip of combination formula double oil seal.

[0043] Referring to Figures 3-7As shown, the inner wall of the mounting groove 33 is provided with an internal thread 34, and the combined sealing device 8 comprises an oil seal seat 81 and an oil seal structure 82; the oil seal seat 81 comprises an annular body 811, the outer side end of the annular body 811 is provided with an external thread 814 matched with the internal thread 34, the inner side end of the annular body 811 is inwardly bent to form a limiting stop edge 812 matched with the oil seal structure 82, and the middle part of the limiting stop edge 812 has a through hole 813 for the outer driving half shaft 5 to pass through. Specifically, the part of the annular body 811 outside the mounting groove 33 is provided with a fixing groove 815 matched with a socket wrench, which is used to fix and tighten the oil seal seat 81, and the oil seal seat is slowly tightened by the socket wrench to ensure a certain tightening torque. The part of the annular body 811 outside the mounting groove 33 is provided with an annular tool withdrawal groove 816 to avoid damage to the external thread. The oil seal structure 82 is a combined double oil seal. The blade contact part of the oil seal structure 82 is evenly coated with lubricating oil; the outer side end surface and the external thread 814 of the annular body 811 are evenly coated with sealant. When installing the outer driving half shaft, the outer driving half shaft and the combined double oil seal blade contact part are evenly coated with lubricating oil, which facilitates the easy insertion of the outer driving half shaft and does not damage the oil seal blade. When installing the oil seal seat into the shaft tube, the oil seal seat thread outer circle and the outer end surface are evenly coated with sealant, the fastening glue is removed, and the double sealing of fine thread sealing as the main and sealant sealing as the auxiliary is adopted, which has better effect and more reliable sealing. The oil seal seat mouth is processed with a 2X30° chamfer, which facilitates the smooth press-fitting of the combined double oil seal and does not damage the combined double oil seal. At the same time, the oil seal seat inner hole root is processed with a ≤R1 transition arc, which facilitates the press-fitting of the oil seal seat in place.

[0044] Referring to Figure 1 and Figure 2 As shown, the shell 1 and the support 2 are both in U-shaped structure, the shell 1 comprises two first prongs 11, and the support 2 comprises two second prongs 21; the two second prongs 21 are located between the two first prongs 11 and are connected with the corresponding first prong 11 through a pin shaft 12, and the steering ball cage 7 is arranged between the two second prongs 21. Specifically, the shaft tube 3 is fixedly connected with the shell 1 through a first fixing bolt 35, and the axle housing 4 is fixedly connected with the support 2 through a second fixing bolt 41. The shaft tube 3 is internally provided with a cavity 31 matched with the outer driving half shaft 5, and the inner side end of the shaft tube 3 is provided with a flange 32 matched with the shell 1.

[0045] Referring to Figure 8 As shown, it further comprises a press-fitting tool 9 matched with the combined sealing device 8, and the press-fitting tool 9 comprises a cylindrical body 91, the end of the cylindrical body 91 is outwardly bent to form a flange 92, and the flange 92 is provided with a press-fitting protrusion 93 for abutting against the oil seal structure 82.

[0046] In the description of the specification, the description of the terms "one embodiment", "preferably", "example", "specific example" or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the utility model, and the illustrative description of the above terms in the specification does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0047] Through the description of the structure and principle above, those skilled in the art should understand that the utility model is not limited to the specific embodiments described above, and improvements and replacements of the technology known in the art based on the utility model all fall within the protection scope of the utility model, which should be limited by the claims.

Claims

1. A wheel-side deceleration steering drive front axle external half-shaft combined sealing structure, comprising a housing (1), a support (2), a steering ball cage (7), a shaft tube (3), and an axle housing (4), wherein the housing (1) and the support (2) are arranged opposite to each other and form a receiving space for accommodating the steering ball cage (7); the shaft tube (3) is connected to the housing (1), and the external drive half-shaft (5) inside the shaft tube (3) passes through the housing (1) and is connected to one end of the steering ball cage (7); the axle housing (4) is connected to the support (2), and the internal drive half-shaft (6) inside the axle housing (4) passes through the support (2) and is connected to the other end of the steering ball cage (7); characterized in that: It also includes a combined sealing device (8), with an installation groove (33) provided at the inner port of the shaft tube (3), the combined sealing device (8) being threadedly installed in the installation groove (33), and the combined sealing device (8) being provided with an oil seal structure (82) adapted to the external drive half shaft (5).

2. The wheel-side reduction steering drive front axle outer half-shaft combined sealing structure according to claim 1, characterized in that: The inner wall of the mounting groove (33) is provided with an internal thread (34). The combined sealing device (8) includes an oil seal seat (81) and an oil seal structure (82). The oil seal seat (81) includes an annular body (811). The outer end of the annular body (811) is provided with an external thread (814) that is compatible with the internal thread (34). The inner end of the annular body (811) is bent inward to form a limiting stop (812) that is compatible with the oil seal structure (82). The middle part of the limiting stop (812) has a through hole (813) for the external drive half shaft (5) to pass through.

3. The wheel-side reduction steering drive front axle outer half-shaft combined sealing structure according to claim 2, characterized in that: The portion of the annular body (811) located outside the mounting groove (33) is provided with a fixing groove (815), which is adapted to a socket wrench and is used to fix and tighten the oil seal seat (81).

4. The wheel-side reduction steering drive front axle outer half-shaft combined sealing structure according to claim 3, characterized in that: The annular body (811) outside the mounting groove (33) is provided with an annular retraction groove (816).

5. The wheel-side reduction steering drive front axle outer half-shaft combined sealing structure according to claim 1, characterized in that: The oil seal structure (82) is a combined double oil seal.

6. The wheel-side reduction steering drive front axle outer half-shaft combined sealing structure according to claim 1, characterized in that: The housing (1) and the support (2) are both U-shaped. The housing (1) includes two first forks (11), and the support (2) includes two second forks (21). The two second forks (21) are located between the two first forks (11) and are respectively connected to the corresponding first forks (11) by pins (12). The steering ball cage (7) is arranged between the two second forks (21).

7. The wheel-side reduction steering drive front axle outer half-shaft combined sealing structure according to claim 1, characterized in that: The shaft tube (3) is fixedly connected to the housing (1) by the first fixing bolt (35), and the bridge housing (4) is fixedly connected to the support (2) by the second fixing bolt (41).

8. The wheel-side reduction steering drive front axle outer half-shaft combined sealing structure according to claim 1, characterized in that: The shaft tube (3) has a cavity (31) that is adapted to the external drive half shaft (5) inside, and a flange (32) that is adapted to the housing (1) is provided on the inner end of the shaft tube (3).

9. The wheel-side reduction steering drive front axle outer half-shaft combined sealing structure according to claim 2, characterized in that: Lubricating oil is evenly applied to the cutting edge contact area of ​​the oil seal structure (82); sealant is evenly applied to the outer end face and external thread (814) of the annular body (811).

10. The wheel-side reduction steering drive front axle outer half-shaft combined sealing structure according to claim 2, characterized in that: It also includes a press-fitting fixture (9) adapted to the combined sealing device (8), the press-fitting fixture (9) including a cylindrical body (91), the end of the cylindrical body (91) being bent outward to form a flange (92), the flange (92) being provided with a press-fitting protrusion (93) for supporting the oil seal structure (82).

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