Differential mechanism

Abstract

The utility model discloses a differential mechanism which comprises a shell, a middle shaft, a planetary gear, a pair of half shafts and a pair of half shaft gears, the middle shaft, the planetary gear, the pair of half shafts and the pair of half shaft gears are installed in the shell, and first bearings are arranged between the pair of half shaft gears and the shell. The shell comprises a first outer shell and a second outer shell, a sealing structure is arranged between the first outer shell and the second outer shell, and the sealing structure is located at the joint of the first outer shell and the second outer shell. The outer shell is used for limiting left-right shaking of the differential mechanism and disengagement of the second bearing, meanwhile, the joint of the first outer shell and the second outer shell can be well sealed, external dust and muddy water can be prevented from entering an inner cavity of the shell to a certain degree, meanwhile, outward permeation of lubricating oil can be reduced, and the service life of the differential mechanism is prolonged. Components in the differential mechanism can be well protected, and the service life of the differential mechanism is prolonged.

Description

Technical Field

[0001] The utility model belongs to the field of transportation equipment, and particularly relates to a differential. Background Art

[0002] The differential housing is mostly formed by screwing a first housing with shaft holes and a second housing. Although its housing is a sealed structure, there are often certain micro-undetectable gaps at the joint of the first housing and the second housing, which easily cause external dust and muddy water to enter the inner cavity of the housing. At the same time, it is also easy for the lubricating oil in the inner cavity to seep out, which is likely to damage internal components such as planetary gears and axle gears, and reduce the service life of the differential.

[0003] Therefore, in view of the above technical problems, it is necessary to provide a differential. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a differential that can solve the above problems.

[0005] In order to achieve the above purpose, the technical solution provided by a specific embodiment of the utility model is as follows:

[0006] A differential includes a housing and a central shaft, planetary gears, a pair of axles, and a pair of axle gears installed in the housing. Bearings are arranged between each of the pair of axle gears and the housing.

[0007] The housing includes a first housing and a second housing. A sealing structure is arranged between the first housing and the second housing, and the sealing structure is located at the connection of the first housing and the second housing.

[0008] In one or more embodiments of the utility model, the sealing structure includes a first annular groove opened on the first housing and a second annular groove opened on the second housing. The first annular groove corresponds to the second annular groove, and the groove wall of the first annular groove away from the central shaft is located outside the groove wall of the second annular groove away from the central shaft.

[0009] In one or more embodiments of the utility model, the first housing includes a first end face, the second housing includes a second end face matching the first end face. The first annular groove is located on the first end face, the second annular groove is located on the second end face. The height of the first annular groove is less than half of the thickness of the first end face, and the height of the second annular groove is less than half of the thickness of the second end face.

[0010] In one or more embodiments of the utility model, a first cavity is formed between the first annular groove and the second annular groove, and a first sealing ring and a second sealing ring are installed in the first cavity.

[0011] In one or more embodiments of the present invention, the first sealing ring matches the second annular groove and is partially clamped in the second annular groove, the second sealing ring is clamped in the first annular groove, and the first sealing ring is in contact with the second sealing ring.

[0012] In one or more embodiments of the present invention, the overlapped portion of the first sealing ring and the second sealing ring is greater than one quarter of the total surface area of ​​the first sealing ring.

[0013] In one or more embodiments of the present invention, a second cavity is formed between the first sealing ring, the second sealing ring and the inner side wall of the first annular groove.

[0014] In one or more embodiments of the present invention, the total volume of the second cavity accounts for one twentieth of the volume of the first cavity.

[0015] In one or more embodiments of the present invention, the distance between the sealing structure and the edge of the first end face or the second end face is greater than one sixth of the thickness of the first end face or the second end face.

[0016] In one or more embodiments of the utility model, a second bearing is arranged between a pair of the half-shafts and the housing, a retaining ring is arranged on the side of the second bearing away from the central axis, and a second mounting groove matching the retaining ring is opened on the pair of the half-shafts to limit the left and right shaking of the differential and the disengagement of the second bearing, which can reduce the abnormality of the differential to a certain extent.

[0017] Compared with the prior art, the utility model can achieve better sealing at the joint between the first shell and the second shell, which can not only prevent external dust and muddy water from entering the inner cavity of the shell to a certain extent, but also reduce the outward penetration of lubricating oil, and can achieve better protection for the internal components of the differential, thereby increasing the service life of the differential. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a first cross-sectional view of a differential in one embodiment of the utility model;

[0020] Figure 2 In one embodiment of the utility model Figure 1 Schematic diagram of the structure at A in the middle;

[0021] Figure 3 This is the second sectional view of the differential in an embodiment of the present utility model;

[0022] Figure 4 In an embodiment of the present utility model Figure 3 Schematic diagram of the structure at position B;

[0023] Figure 5 In an embodiment of the present utility model Figure 3 Schematic diagram of the structure at position C;

[0024] Figure 6 This is the sectional view of the housing in an embodiment of the present utility model;

[0025] Figure 7 In an embodiment of the present utility model Figure 6 Schematic diagram of the structure at position D.

[0026] Main reference numeral description:

[0027] 00 - Housing, 01 - Half shaft, 011 - First installation groove, 012 - Second installation groove, 1 - First outer shell, 101 - First annular groove, 2 - Second outer shell, 201 - Second annular groove, 3 - Central shaft, 4 - First sealing ring, 5 - Second sealing ring, 6 - Planet gear, 7 - Side gear, 8 - First bearing, 9 - Second bearing, 10 - Retaining ring. Detailed implementation manners

[0028] In order to enable those skilled in the art to better understand the technical solutions in the present utility model, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0029] As Figure 6 shown, a differential includes a housing 00, the housing 00 includes a first outer shell 1 and a second outer shell 2, and a sealing structure is provided between the first outer shell 1 and the second outer shell 2, and the sealing structure is located at the connection between the first outer shell 1 and the second outer shell 2. Specifically, the first outer shell 1 and the second outer shell 2 are connected by screws. Threaded through - holes are provided on the second outer shell 2, and corresponding threaded holes are also provided on the first outer shell 1. Screws are threadedly connected in the threaded holes on the first outer shell 1 and the second outer shell 2, and the screws penetrate through the threaded through - holes on the second outer shell 2.

[0030] As Figure 1 、 Figure 2 、Figure 6 As shown, a central shaft 3 is installed in the inner cavity of the housing 00, and the central shaft 3 is perpendicular to the central axis of the housing 00. A planetary gear 6 is sleeved on the central shaft 3, and a side gear 7 is meshed and connected to the planetary gear 6, and two side gears 7 are meshed and connected through the planetary gear 6, and the central axis of the side gear 7 is perpendicular to the central axis of the central shaft 3. The planetary gear 6 is fixedly connected to the central shaft 3, and each planetary gear 6 is meshed with the side gear 7 at the same time, so that the stable operation of the planetary gear 6 and the side gear 7 can be ensured.

[0031] like Figure 1 , Figure 2 , Figure 6 As shown, a pair of half shafts 01 are installed in the housing 00, one end of the half shafts 01 is meshed with the half shaft gear 7, and the other end protrudes outside the housing 00. A second bearing 9 is installed between the half shaft 01 and the housing 00, preferably a deep groove ball bearing, which has a simple structure and is easy to use. It is mainly used to bear radial loads, but when the radial clearance of the bearing is increased, it has a certain performance of an angular contact ball bearing and can bear combined radial and axial loads.

[0032] like Figure 2 , Figure 5 As shown, two first mounting grooves 011 are provided on each of the pair of half shafts 01. Half shafts 01 are wheel shafts, which are assembled to the rear car and then the wheels are assembled. The first mounting grooves 011 are used to prevent the wheel shafts from shaking left and right on the rear car.

[0033] A second mounting groove 012 is provided on each of the pair of half shafts 01. A retaining ring 10 is installed in the second mounting groove 012 to limit the left and right swing of the differential and the disengagement of the second bearing 9, which can reduce the abnormality of the differential to a certain extent.

[0034] like Figure 2 , Figure 6 ,and Figure 7 As shown, the sealing structure includes a first annular groove 101 provided on the first housing 1 and a second annular groove 201 provided on the second housing 2. The first annular groove 101 corresponds to the second annular groove 201. The groove wall of the first annular groove 101 away from the central axis 3 is located outside the groove wall of the second annular groove 201 away from the central axis 3. Specifically, the first annular groove 101 is an annular groove with a rectangular cross section, and the second annular groove 201 is an annular groove with a semicircular cross section. The openings of the two annular grooves overlap, so that the first annular groove 101 and the second annular groove 201 can be combined into a larger annular groove. The lower end surface of the first annular groove 101 and the lower end surface of the second annular groove 201 are located in the same plane, and the upper end surface of the first annular groove 101 is higher than the lower end surface of the second annular groove 201, preferably 4 to 8 mm.

[0035] like Figure 7As shown, the first housing 1 includes a first end face, the second housing 2 includes a second end face that matches the first end face, the first annular groove 101 is located on the first end face, and the second annular groove 201 is located on the second end face. That is, both the first end face and the second end face are located at the connection between the first housing 1 and the second housing 2. When the first housing 1 and the second housing 2 are closely fitted, the first end face and the second end face will merge into the connection end face of the first housing 1 and the second housing 2. Preferably, the height of the first annular groove 101 is less than half of the thickness of the first end face, and the height of the second annular groove 201 is less than half of the thickness of the second end face.

[0036] Preferably, the distance between the sealing structure and the edge of the first end face or the second end face is greater than one-sixth of the thickness of the first end face or the second end face.

[0037] Preferably, the sealing structure is located on the side of the midline of the first end face or the second end face away from the central axis 3.

[0038] As Figure 4 、 Figure 7 shown, a first cavity is formed between the first annular groove 101 and the second annular groove 201. A sealing assembly is installed in the first cavity. The sealing assembly includes a first sealing ring 4 and a second sealing ring 5. The first sealing ring 4 matches the second annular groove 201 and is partially clamped in the second annular groove 201. The second sealing ring 5 is clamped in the first annular groove 101, and the first sealing ring 4 is in contact with the second sealing ring 5. That is, a part of the second annular groove 201 is filled by the first sealing ring 4. Preferably, the cross-sectional area of the part of the second annular groove 201 filled by the first sealing ring 4 is greater than one-third and less than one-half of the cross-sectional area of the first sealing ring 4.

[0039] Preferably, the overlapping part of the first sealing ring 4 and the second sealing ring 5 is greater than one-fourth of the total surface area of the first sealing ring 4. Thus, if dust or muddy water enters the joint between the first housing 1 and the second housing 2, it will first be blocked by the first sealing ring 4. When the external pressure on the first sealing ring 4 is too large, the first sealing ring 4 undergoes a slight deformation, and the second sealing ring 5 also plays a role in blocking the dust and muddy water outside to achieve good protection of the inside of the differential.

[0040] As Figure 4 shown, the first sealing ring 4 and the second sealing ring 5 are made of elastic materials. When the service life is too long, they will expand to a certain extent and the elasticity will weaken. External dust or rain will squeeze the sealing assembly into the differential to contaminate the lubricating oil. Therefore, in order to extend the service life of the sealing assembly and improve its working stability, a second cavity is formed between the first sealing ring 4, the second sealing ring 5 and the inner side wall of the first annular groove 101.

[0041] Preferably, the total volume of the second cavity accounts for one-twentieth of the volume of the first cavity, thereby realizing the effective cooperation between the first sealing ring 4 and the second sealing ring 5. In this way, sufficient space is reserved in the first cavity for the expansion of the first sealing ring 4 and the second sealing ring 5. When external rainwater and dust squeeze the sealing assembly, the allowances of the first annular groove 101 and the second annular groove 201 accommodate the deformation generated by the first sealing ring 4 and the second sealing ring 5, thereby blocking foreign sundries at the contact with the outside world and realizing the effective protection of the inside of the differential.

[0042] As Figure 1 , Figure 2 shown, one end of the half shaft gear 7 that does not mesh with the planet gear 6 is sleeved with a first bearing 8, preferably an angular contact bearing, which can bear both radial force and axial force, and at the same time can reduce the shaking clearance when the planet gear 6 and the half shaft gear 7 cooperate, making the differential operate smoothly with low noise and vibration and excellent performance.

[0043] During specific use, when dust or muddy water enters the joint between the first housing 1 and the second housing 2, it will first be blocked by the first sealing ring 4. When the external pressure on the first sealing ring 4 is too large, the second sealing ring 5 undergoes a slight deformation, and the second sealing ring 5 also plays a role in blocking the dust and muddy water outside. When the first sealing ring 4 and the second sealing ring 5 have been used for too long, they will expand to a certain extent and their elasticity will weaken. At this time, in addition to accommodating the sealing assembly, the first cavity formed by the first annular groove 101 and the second annular groove 201 also has a second cavity to accommodate the expansion amount of the first sealing ring 4 and the second sealing ring 5, enabling the sealing assembly to continue to play a good sealing role to achieve good protection of the inside of the differential and improve the service life of the differential.

[0044] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, in any regard, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present utility model. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0045] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A differential, comprising a housing and a central shaft, planetary gears, a pair of half shafts and a pair of side gears mounted in the housing, characterized in that, A first bearing is provided between each of the pair of axle half gears and the housing. The housing includes a first outer shell and a second outer shell. A sealing structure is provided between the first outer shell and the second outer shell, and the sealing structure is located at the connection between the first outer shell and the second outer shell.

2. A differential according to claim 1, characterized in that The sealing structure includes a first annular groove formed in the first outer shell and a second annular groove formed in the second outer shell. The first annular groove corresponds to the second annular groove, and the groove wall of the first annular groove away from the central axis is located outside the groove wall of the second annular groove away from the central axis.

3. A differential according to claim 2, characterized in that, The first outer shell includes a first end face, and the second outer shell includes a second end face matching the first end face. The first annular groove is located on the first end face, and the second annular groove is located on the second end face. The height of the first annular groove is less than one-half of the thickness of the first end face, and the height of the second annular groove is less than one-half of the thickness of the second end face.

4. A differential according to claim 2, characterized in that, A first cavity is formed between the first annular groove and the second annular groove, and a first sealing ring and a second sealing ring are installed in the first cavity.

5. A differential according to claim 4, characterized in that, The first sealing ring matches the second annular groove and is partially clamped in the second annular groove. The second sealing ring is clamped in the first annular groove, and the first sealing ring is in contact with the second sealing ring.

6. A differential according to claim 5, wherein, The overlapping portion of the first sealing ring and the second sealing ring is greater than one-fourth of the total surface area of the first sealing ring.

7. A differential according to claim 4, wherein A second cavity is formed between the first sealing ring, the second sealing ring and the inner side wall of the first annular groove.

8. A differential according to claim 7, wherein, The total volume of the second cavity accounts for one-twentieth of the volume of the first cavity.

9. A differential according to claim 1, characterized in that, The distance between the sealing structure and the edge of the first end face or the second end face is greater than one-sixth of the thickness of the first end face or the second end face.

10. A differential according to claim 1, characterized in that, A second bearing is provided between each of the pair of axles and the housing. A retaining ring is provided on the side of the pair of second bearings away from the central axis, and a second installation groove matching the retaining ring is formed on each of the pair of axles.

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