Pinion and bevel gear differential

Abstract

The utility model relates to a pin shaft and bevel gear differential for bevel gear differential. Pin shaft is used to rotatably support planetary bevel gear of bevel gear differential, and include: first end portion, its outer circumferential surface is concave radially to the inside and defines recess, recess can be embedded with the spacing structure on the cover of bevel gear differential, so that pin shaft can keep fixed relative to the casing of bevel gear differential with fixed connection of cover, and second end portion is opposite with first end portion in the axial direction of pin shaft, and can be engaged with the retaining block of bevel gear differential, to prevent planetary bevel gear from moving away from the first end portion of pin shaft along the axial direction of pin shaft. The pin shaft and bevel gear differential for bevel gear differential of the utility model can simplify the process of assembly and disassembly.

Description

Technical Field

[0001] This utility model relates to a pin for a bevel gear differential and a bevel gear differential. Background Technology

[0002] Compared to planetary gear differentials, traditional bevel gear differentials have the advantages of simple structure and low cost. Given customer demands for lower costs, planetary gear differentials will gradually be replaced by bevel gear differentials. Compared to traditional bevel gear differentials with only two bevel gears, differentials with three or four bevel gears have the advantage of smaller size and can be combined with stepped planetary gear drives, making the gearbox structure more compact and smaller in size. Therefore, for high-torque differentials, bevel gear differentials with multiple bevel gears are typically used.

[0003] Differentials with three or four bevel gears require retaining blocks to hold the pins in the correct position. In patent US5366421A, the pins and retaining blocks are integrated. In patent CN118532454A, the separate pins and retaining blocks are first assembled together, and then the pins are secured with locating pins. In both types, for assembly purposes, the differential housing needs to be divided into two parts: the housing and the cover. The integrated or combined pins are mounted in a receiving groove in the housing, and then the cover is bolted to the housing.

[0004] Integrated pins require high machining and positioning precision for the journals, resulting in high scrap rates and high manufacturing costs, and are gradually being phased out by the market.

[0005] Combination pins offer cost advantages by reducing the manufacturing precision of individual parts, gradually becoming the mainstream in the market. However, each pin is secured using a locating pin, requiring the machining of corresponding pin holes in both the pin and the differential housing, demanding high dimensional and positional accuracy. Excessive interference between the locating pin and the pin hole makes installation more difficult and may even damage the differential housing. Insufficient interference may cause the pin to slip out of the hole, necessitating a structure to prevent slippage. Furthermore, the pressing process during assembly can damage the locating pin or differential housing during disassembly. Moreover, this combination of pins increases the number of parts, raising costs. Utility Model Content

[0006] The purpose of this invention is to provide an improved pin for a bevel gear differential and a bevel gear differential that simplifies the assembly and disassembly process.

[0007] One aspect of this utility model provides a pin for a bevel gear differential, which rotatably supports the planetary bevel gears of the bevel gear differential, and includes:

[0008] At the first end, its outer circumferential surface is radially recessed inward to define a groove, which can engage with the limiting structure on the cover of the bevel gear differential, so that the pin can remain fixed relative to the housing of the bevel gear differential, which is fixedly connected to the cover; and

[0009] The second end, which is axially opposite to the first end of the pin, is capable of engaging with the retaining block of the bevel gear differential to prevent the planetary bevel gear from moving away from the first end of the pin axially.

[0010] According to an embodiment of the present invention, the groove is formed by turning.

[0011] According to an embodiment of the present invention, the groove has a flat bottom wall parallel to the axial direction and a pair of opposing side walls perpendicular to the axial direction, and the pin passes through it in a transverse direction perpendicular to the axial and radial directions of the pin.

[0012] According to an embodiment of the present invention, the middle section of the pin has at least one recessed lubrication groove on its outer peripheral surface, and the at least one lubrication groove extends axially.

[0013] Another aspect of this utility model provides a bevel gear differential, which includes:

[0014] Planetary bevel gears;

[0015] According to any of the above embodiments, the pin rotatably supports the planetary bevel gear.

[0016] The housing is hollow inside, and the pins and planetary bevel gears are located inside the housing.

[0017] The cover, which is fixedly connected to the housing, has a limiting structure on the cover that engages with a groove at the first end of the pin, allowing the pin to remain fixed relative to the housing; and

[0018] A retaining block, located within the housing and engaging with the second end of the pin, prevents the planetary bevel gear from moving axially away from the first end of the pin.

[0019] According to an embodiment of the present invention, the housing has a first through hole, which is connected to a groove, and a limiting structure passes through the first through hole and is fitted into the groove.

[0020] According to an embodiment of the present invention, the cover has a first flat surface, a limiting structure is formed on the first flat surface, and the housing has a second flat surface that abuts against the first flat surface, and the opening of the first through hole of the housing is formed on the second flat surface.

[0021] According to an embodiment of the present invention, the limiting structure is a cuboid, the length direction of which is perpendicular to the axial and radial directions of the pin.

[0022] According to an embodiment of the present invention, the bevel gear differential includes multiple pins, and the retaining block has multiple evenly distributed radial holes, with each pin inserted into a corresponding radial hole.

[0023] According to an embodiment of the present invention, the middle section of the pin has at least one recessed lubrication groove on its outer peripheral surface. The at least one lubrication groove extends axially and corresponds to the axial position of the planetary bevel gear. The axial length of the at least one lubrication groove is greater than the axial thickness of the planetary bevel gear.

[0024] According to the design of this utility model, the pin can be assembled on the housing simply by engaging the first end of the pin with the groove a of the pin and fixing the cover to the housing; the pin can be disassembled from the housing simply by removing the cover, thus simplifying the assembly and disassembly process. The design of the limiting structure and the groove is relatively simple, making it easier for operators to operate and reducing assembly difficulty. In addition, this design avoids the use of pin holes and positioning pins, thereby reducing the requirements for dimensional and positional accuracy. No pressing is required during assembly, and the housing will not be damaged during disassembly. Furthermore, the number of parts in this design is small, which reduces costs. The pin of this application is not limited by the number of bevel gears; it can be used for three or four bevel gears without the need for redevelopment, thus having a wide range of applications. Attached Figure Description

[0025] Figure 1 This is a perspective view of a bevel gear differential according to an embodiment of the present invention.

[0026] Figure 2 This is an exploded view of a bevel gear differential according to an embodiment of the present invention.

[0027] Figure 3 This is a longitudinal section view of a bevel gear differential according to an embodiment of the present invention.

[0028] Figure 4 This is a cross-sectional view of a bevel gear differential according to an embodiment of the present invention.

[0029] Figure 5 This is another cross-sectional view of a bevel gear differential according to an embodiment of the present invention.

[0030] Figure 6 This is a perspective view of the cover according to an embodiment of the present invention.

[0031] Figure 7 This is a perspective view of the pin according to an embodiment of the present invention.

[0032] Figure 8This is a perspective view of the housing according to an embodiment of the present invention.

[0033] Figure 9 This is a cross-sectional perspective view of the housing according to an embodiment of the present invention.

[0034] Figure 10 This is a perspective view of the retaining block according to an embodiment of the present invention. Detailed Implementation

[0035] The following description of the embodiments with accompanying drawings is intended to provide a better understanding of the present invention. Here, the same components are given consistent reference numerals.

[0036] It should be understood that although the terms first, second, etc., may be used in this specification to describe various elements, these elements should not be limited to these terms. These terms are only used to distinguish elements of the same type from each other. For example, without departing from the scope of this specification, a first element may also be referred to as a second element, and similarly, a second element may also be referred to as a first element.

[0037] A bevel gear differential can be used in the eAxle's gearbox and is configured to drive the first and second output shafts to rotate around the differential's central axis at different speeds, satisfying the different speed requirements of one of the left and right wheels connected to the first output shaft and the other of the left and right wheels connected to the second output shaft.

[0038] Figures 1 to 5 These are, respectively, a perspective view, an exploded view, a longitudinal section view, a cross-sectional view, and another cross-sectional view of the bevel gear differential according to an embodiment of this utility model. Figures 1 to 5 As shown, the bevel gear differential may include a pin 1, a housing 2, a planetary bevel gear 3, a cover 4, and a retaining block 5. The pin 1 rotatably supports the planetary bevel gear 3. The housing 2 is hollow, and the pin 1 and the planetary bevel gear 3 are located inside the housing 2.

[0039] like Figure 3 As shown, the cover 4 is fixedly connected to the housing 2 and forms a limiting structure 41. Figure 6 This is a perspective view of the cover according to an embodiment of the present utility model. Figure 7 This is a perspective view of the pin according to an embodiment of the present invention. Figure 6 and Figure 7As shown, the pin 1 includes a first end 11 and a second end 12 opposite to the first end 11 in the axial direction X1. The outer peripheral surface of the first end 11 is radially recessed inward to define a groove 11a, which can engage with the limiting structure 41 of the cover 4, so that the pin 1 remains fixed relative to the housing 2 which is fixedly connected to the cover 4. That is, the shape of the limiting structure 41 matches the groove 11a, and the limiting structure 41 can be inserted into the groove 11a, thereby restricting the rotation and movement of the pin 1. Thus, the pin 1 cannot rotate relative to the housing 2, and cannot move relative to the housing 2 in the axial direction X1 and radially, so as to hold the planetary bevel gear 3 in the proper position. The retaining block 5 is located inside the housing 2 and engages with the second end 12 of the pin 1 to provide support for the pin 1, improving the support stability and support stiffness of the pin 1.

[0040] According to the design of this utility model, the assembly of the pin 1 can be completed simply by fitting the groove 11a of the first end 11 of the pin 1 into the limiting structure 41 of the cover 4 and fixing the cover 4 to the housing 2; the pin 1 can be disassembled simply by removing the cover 4 from the housing 2, thus simplifying the assembly and disassembly process. The design of the limiting structure 41 and the groove 11a is relatively simple, making it easier for operators to operate and reducing the assembly difficulty. In addition, this design avoids the use of pin holes and positioning pins, thereby reducing the requirements for dimensional and positional accuracy. No pressing is required during assembly, and the housing 2 will not be damaged during disassembly. Furthermore, the number of parts in this design is small, which reduces costs. The pin 1 of this application is not limited by the number of bevel gears; the pin 1 of this application can be used for three bevel gears and four bevel gears without the need for redevelopment, thus having a wide range of applications.

[0041] Refer again Figure 6 and Figure 7 The groove 11a has a flat bottom wall parallel to the axial direction X1 and a pair of opposing side walls perpendicular to the axial direction X1, and extends through the pin 1 in a transverse direction perpendicular to the axial direction X1 and the radial direction of the pin 1. The groove 11a can be formed by turning. The limiting structure 41 is constructed as a cuboid, the length direction of which is perpendicular to the axial direction X1 and the radial direction of the pin 1.

[0042] The pin 1 has a substantially circular cross-section. The circular cross-section is substantially constant along the entire axial direction X1 of the pin 1. The middle section of the pin 1 has at least one recessed lubrication groove 13 on its outer circumferential surface. The at least one lubrication groove 13 extends along the axial direction X1, corresponds to the axial position of the planetary bevel gear 3, and the axial length of the at least one lubrication groove 13 is greater than the axial thickness of the planetary bevel gear 3 to achieve a lubrication effect.

[0043] Figure 8 and Figure 9These are perspective views and cross-sectional perspective views of the housing 2 according to an embodiment of the present invention. Figure 8 and Figure 9 As shown, housing 2 has a first through hole 2a. (Return to reference) Figure 3 The first through hole 2a communicates with the groove 11a of the first end 11. The limiting structure 41 passes through the first through hole 2a to engage with the groove 11a. The first through hole 2a extends radially along the pin 1. The housing 2 may also include a second through hole 2b, which receives the first end 11 and communicates with the first through hole 2a.

[0044] like Figure 6 and Figure 8 As shown, the cover 4 has a first flat surface 42, and a limiting structure 41 is formed on the first flat surface 42. The housing 2 has a second flat surface 21, which abuts against the first flat surface 42. The opening of the first through hole 2a is located on the second flat surface 21. In one example, both the first flat surface 42 and the second flat surface 21 are annular segments, and they have the same shape.

[0045] The housing 2 is constructed in a generally cylindrical shape with a central axis X2, and the cover 4 covers the opening of the housing 2 on its own central axis X2. The cover 4 has a main body 43 and a joint 44. The main body 43 is constructed in a bowl shape with openings at both ends, and the joint 44 protrudes radially outward from the outer periphery of the large-diameter end of the main body 43.

[0046] In one embodiment, the joint 44 is constructed as a plurality of annular segments, for example, three. The plurality of annular segments are evenly spaced along the outer periphery of the large-diameter end of the main body 43. One axial end face of the joint 44 is flush with the axial end face of the main body 43, and another axial end face of the joint 44 is formed as the aforementioned first flat surface 42. A third through hole 44a is formed on the joint 44 for a fastener 6 (e.g., a bolt) to pass through, through which the fastener 6 can fasten the cover 4 to the housing 2.

[0047] The cover 4 may further include a plurality of first mating portions 45, each of which is constructed as an annular segment and connects the radially inner side of the joint portion 44 to the outer periphery of the main body portion 43. The housing 2 may further include a plurality of second mating portions 22, each of which is constructed as an annular segment and connects to the radially inner side of the first flat surface 42. The first mating portions 45 abut against the second mating portions 22.

[0048] Refer again Figure 1 The retaining block 5 can be formed separately from the pin 1. The pin 1 and the retaining block 5 can be firmly connected or not connected to each other. Alternatively, the retaining block 5 can be formed integrally with the pin 1. Figure 10 This is a perspective view of the retaining block 5 according to an embodiment of the present invention. Figure 10 As shown, the retaining block 5 has a radial hole 5a into which the pin 1 is inserted. The retaining block 5 is generally cylindrical, and its center has a fourth through hole 5b extending along the central axis X2 of the housing 2. The radial hole 5a communicates with the fourth through hole 5b. The retaining block 5 has a flat mating surface 51, and the end face of the planetary bevel gear 3 abuts against the mating surface 51.

[0049] Return to reference Figure 4 and Figure 5 The bevel gear differential includes multiple pins 1, for example, three or four. All pins 1 have the same construction. The retaining block 5 has multiple evenly distributed radial holes 5a, into which each pin 1 is inserted.

[0050] While possible embodiments have been described exemplarily in the foregoing description, it should be understood that numerous variations of the embodiments exist through combinations of all known and readily conceived technical features and implementation methods. Furthermore, it should be understood that the exemplary embodiments are merely examples and do not in any way limit the scope, application, or construction of this invention. The foregoing description is more intended to provide those skilled in the art with technical guidance for transforming at least one exemplary embodiment, wherein various changes can be made, particularly regarding the function and structure of the components, without departing from the scope of the claims.

[0051] List of reference numerals

[0052] 1. Pin; 11. First end; 11a. Groove; 12. Second end; 13. Lubrication groove; X1. Axial direction;

[0053] 2. Housing; 2a. First through hole; 2b. Second through hole; 21. Second flat surface; 22. Second mating part; X2. Central axis;

[0054] 3. Planetary bevel gears;

[0055] 4. Cover; 41. Limiting structure; 42. First flat surface; 43. Main body; 44. Joint; 44a. Third through hole; 45. First mating part;

[0056] 5. Retaining block; 51. Mating surface; 5a. Radial hole; 5b. Fourth through hole;

[0057] 6. Fasteners.

Claims

1. A pin (1) for a bevel gear differential, which rotatably supports a planetary bevel gear (3) of the bevel gear differential, characterized in that, include: The first end (11) has a radially inwardly recessed outer circumferential surface defining a groove (11a), which can engage with a limiting structure (41) on the cover (4) of the bevel gear differential, so that the pin (1) can remain fixed relative to the housing (2) of the bevel gear differential, which is fixedly connected to the cover (4); and The second end (12) is opposite to the first end (11) in the axial direction (X1) of the pin (1) and is capable of engaging with the retaining block (5) of the bevel gear differential to prevent the planetary bevel gear (3) from moving away from the first end (11) of the pin (1) in the axial direction (X1) of the pin (1).

2. The pin (1) according to claim 1, characterized in that, The groove (11a) is formed by turning.

3. The pin (1) according to claim 1, characterized in that, The groove (11a) has a flat bottom wall parallel to the axial direction (X1) and a pair of opposing side walls perpendicular to the axial direction (X1), and extends through the pin (1) in a transverse direction perpendicular to the axial direction (X1) and radial direction of the pin (1).

4. The pin (1) according to claim 1, characterized in that, The middle section of the pin (1) has at least one recessed lubrication groove (13) on its outer peripheral surface, the at least one lubrication groove (13) extending along the axial direction (X1).

5. A bevel gear differential, characterized in that, include: Planetary bevel gear (3); The pin (1) according to any one of claims 1 to 4 rotatably supports the planetary bevel gear (3); The housing (2) is hollow inside, and the pin (1) and the planetary bevel gear (3) are located inside the housing (2); A cover (4), which is fixedly connected to the housing (2), wherein a limiting structure (41) on the cover (4) engages with a groove (11a) at the first end (11) of the pin (1), thereby allowing the pin (1) to remain fixed relative to the housing (2); and A retaining block (5) is located inside the housing (2) and engages with the second end (12) of the pin (1) to prevent the planetary bevel gear (3) from moving away from the first end (11) of the pin (1) along the axial direction (X1) of the pin (1).

6. The bevel gear differential according to claim 5, characterized in that, The housing (2) has a first through hole (2a) that is connected to the groove (11a), and the limiting structure (41) passes through the first through hole (2a) and is fitted into the groove (11a).

7. The bevel gear differential according to claim 6, characterized in that, The cover (4) has a first flat surface (42), and the limiting structure (41) is formed on the first flat surface (42). The housing (2) has a second flat surface (21) that abuts against the first flat surface (42), and the opening of the first through hole (2a) of the housing (2) is located on the second flat surface (21).

8. The bevel gear differential according to claim 5, characterized in that, The limiting structure (41) is a cuboid, and its length direction is perpendicular to the axial (X1) and radial direction of the pin (1).

9. The bevel gear differential according to claim 5, characterized in that, The bevel gear differential includes a plurality of pins (1), and the retaining block (5) has a plurality of evenly distributed radial holes (5a), each of the pins (1) being inserted into the corresponding radial hole (5a).

10. The bevel gear differential according to claim 5, characterized in that, The middle section of the pin (1) has at least one recessed lubrication groove (13) on its outer peripheral surface. The at least one lubrication groove (13) extends along the axial direction (X1). The at least one lubrication groove (13) corresponds to the axial position of the planetary bevel gear (3), and the axial length of the at least one lubrication groove (13) is greater than the axial thickness of the planetary bevel gear (3).

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