Needle bearing, universal joint assembly and vehicle

Abstract

The invention provides a needle bearing, a universal joint assembly and a vehicle, and belongs to the technical field of vehicle accessories. The needle roller bearing comprises an outer ring, a plurality of needle rollers and an inner ring. The inner wall of the outer ring is provided with a first convex ring and a second convex ring which are arranged at intervals in the axial direction. The inner ring comprises a first part and a second part which are arranged in the axial direction, the first part is sleeved with the outer ring, and the second part is located outside the outer ring. A third protruding ring is arranged on the outer wall of the second part and abuts against the first protruding ring so as to limit the inner ring. The multiple roller pins are located between the first convex ring and the second convex ring and located between the outer ring and the first part. When the needle bearing is used, the axis of the inner ring and the axis of the outer ring do not completely coincide, the difference between the inner diameter of the first protruding ring and the outer diameter of the first part is small and ranges from 0.2 mm to 0.5 mm, and therefore the inner ring is not prone to being disengaged from the outer ring. Therefore, parts are not needed to limit the inner ring, friction pairs in the needle bearing are reduced, and the transmission efficiency of the needle bearing is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of vehicle accessories, and in particular to a needle roller bearing, a universal joint assembly and a vehicle. Background Art

[0002] The universal joint assembly is an important transmission component in the vehicle, used to evenly transmit the vehicle's drive shaft to the reduction gear in the main transmission within a certain angle range. The universal joint assembly includes a housing, a tripod and three needle bearings. The three needle bearings are respectively connected to the three journals of the tripod, and the needle bearings and the tripod are installed in the ball track of the housing. Among them, the needle bearing plays a major role in affecting the transmission efficiency of the universal joint assembly.

[0003] In the related art, a needle roller bearing comprises an outer ring, a plurality of needle rollers, an inner ring and two retaining rings. The inner ends of the outer ring have slots. The two retaining rings are respectively located in the two slots, the needle rollers and the inner ring are located between the two slots, and the plurality of needle rollers are located between the outer ring and the inner ring.

[0004] However, the needle roller bearing in the related art has more friction pairs, which causes the temperature of the needle roller bearing to rise faster and leads to lower transmission efficiency of the needle roller bearing. Summary of the invention

[0005] The present disclosure provides a needle roller bearing, a universal joint assembly and a vehicle, which can solve the technical problems existing in the related technologies. The technical solutions of the needle roller bearing, the universal joint assembly and the vehicle are as follows.

[0006] In a first aspect, the present disclosure provides a needle roller bearing, wherein the needle roller bearing is applied to a universal joint assembly;

[0007] The needle roller bearing comprises an outer ring, a plurality of needle rollers and an inner ring;

[0008] The inner wall of the outer ring has a first convex ring and a second convex ring, and the first convex ring and the second convex ring are arranged at intervals along the axial direction of the outer ring;

[0009] The inner ring comprises a first part and a second part arranged in the axial direction, the outer ring surrounds the first part, the second part is located outside the outer ring, the outer wall of the second part has a third convex ring, the third convex ring and the first convex ring abut against each other, assuming that the inner diameter of the first convex ring is D1 and the outer diameter of the first part is D2, then 0.2mm≤D1-D2≤0.5mm;

[0010] The plurality of needle rollers are located between the first convex ring and the second convex ring and are evenly arranged along the circumference of the outer ring. The plurality of needle rollers are located between the outer ring and the first portion.

[0011] In a possible implementation, 30.8 mm ≤ D1 ≤ 31.2 mm, and 30.4 mm ≤ D2 ≤ 31.6 mm.

[0012] In a possible implementation, the outer wall of the inner ring further has a groove;

[0013] The groove is located in the first part, and is opposite to the first convex ring. In this way, a larger gap can be provided between the bottom wall of the groove and the inner wall of the first convex ring, thereby avoiding friction between the groove and the first convex ring.

[0014] In a possible implementation, the diameter of the groove is assumed to be D3, 1.2 mm ≤ D1 - D3 ≤ 1.5 mm.

[0015] In a possible implementation, assuming that the width of the first convex ring along the axial direction is H1, and the width of the groove along the axial direction is H2, then H2≥H1. In this way, it is possible to prevent the inner wall of the first convex ring and the inner wall of the groove from colliding and contacting each other, thereby facilitating the improvement of the transmission efficiency of the needle roller bearing.

[0016] In a possible implementation, 1.25 mm ≤ H1 ≤ 1.35 mm.

[0017] In one possible implementation, 1.45 mm ≤ H2 ≤ 1.55 mm.

[0018] In a possible implementation, the inner wall of the first part has a fourth convex ring, the fourth convex ring is located between the first convex ring and the second convex ring, and the fourth convex ring is used to abut against the journal of the tripod. This is conducive to fine machining of the first part, thereby reducing the difficulty and complexity of machining the inner ring.

[0019] In a possible implementation, the inner diameter of the first portion is 23.5 mm-24 mm, and the inner diameter of the third convex ring is 24 mm-24.5 mm.

[0020] In a possible implementation, one end of the first portion close to the second convex ring is flush with one end of the needle roller close to the second convex ring. This can avoid friction resistance caused by contact between the first portion and the second convex ring when the needle roller bearing is working, which is beneficial to improving the transmission efficiency of the needle roller bearing.

[0021] In a possible implementation, assuming that the outer diameter of the third convex ring is D4, then 34 mm ≤ D4 ≤ 35 mm. In this way, it can ensure that the third convex ring can limit the inner ring while avoiding increasing the weight and manufacturing cost of the inner ring.

[0022] In a possible implementation, assuming that the width of the third convex ring along the axial direction is L1, then 1mm≤L1≤1.5mm. In this way, it can ensure that the third convex ring can limit the inner ring and avoid the needle roller bearing from being too large in size and weight.

[0023] In a possible implementation, assuming that the width of the outer ring along the axial direction is L2, then 11 mm ≤ L2 ≤ 14 mm.

[0024] In a second aspect, the present disclosure further provides a universal joint assembly, the universal joint assembly comprising a housing, a tripod and three needle roller bearings as described in any one of the first aspects;

[0025] The tripod has three journals, and the three journals are respectively connected to the inner rings of the three needle roller bearings;

[0026] The housing has three ball tracks, and the outer rings of the three needle roller bearings are respectively connected to the inner walls of the three ball tracks.

[0027] In a third aspect, the present disclosure further provides a vehicle, the vehicle comprising the universal joint assembly as described in the second aspect;

[0028] The universal joint assembly is connected to a transmission shaft of the vehicle.

[0029] The technical solution provided by the present disclosure includes at least the following beneficial effects:

[0030] The present disclosure provides a needle roller bearing, in which the third convex ring of the inner ring and the first convex ring of the outer ring are against each other, thereby limiting the inner ring. Since the inner diameter of the first convex ring and the outer diameter of the first part are slightly different, and the axes of the inner ring and the outer ring do not completely overlap during use, the inner ring is not easy to disengage from the outer ring. Therefore, there is no need to use other positioning members (such as retaining rings) to limit the inner ring. Thereby, the number of parts in the needle roller bearing is reduced, and the friction pairs in the needle roller bearing are further reduced. In this way, the temperature rise of the needle roller bearing can be reduced, and it is beneficial to improve the transmission efficiency of the needle roller bearing.

[0031] Moreover, since two parts are reduced, the manufacturing cost of the needle roller bearing can be reduced. At the same time, compared with the related art, there is no need to set a groove on the outer ring to limit the retaining ring, thereby simplifying the manufacturing process of the outer ring and reducing the processing steps of the outer ring.

[0032] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings herein are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the description, are used to explain the principles of the present disclosure. In the drawings:

[0034] Figure 1 is a schematic diagram of an assembly of a universal joint assembly and a transmission shaft shown in an embodiment of the present disclosure;

[0035] Figure 2 is a structural schematic diagram of a universal joint assembly shown in an embodiment of the present disclosure;

[0036] Figure 3 is a cross-sectional view of a needle roller bearing in the related art shown in an embodiment of the present disclosure;

[0037] Figure 4 is a structural schematic diagram of a needle roller bearing shown in an embodiment of the present disclosure;

[0038] Figure 5 is a cross-sectional view of a needle roller bearing and a journal matching shown in an embodiment of the present disclosure;

[0039] Figure 6 is a cross-sectional view of a needle roller bearing shown in an embodiment of the present disclosure;

[0040] Figure 7 is a structural schematic diagram of a universal joint assembly shown in an embodiment of the present disclosure;

[0041] Figure 8 is a structural schematic diagram of a universal joint assembly shown in an embodiment of the present disclosure;

[0042] Fig. 9 It is a cross-sectional view of a shell shown in an embodiment of the present disclosure.

[0043] Legend:

[0044] 1. outer ring, 10. slot, 11. first convex ring, 12. second convex ring;

[0045] 2. Needle rolling;

[0046] 3. inner ring, 301. first part, 302. second part, 31. third convex ring, 32. groove, 33. fourth convex ring;

[0047] 4. Retaining ring.

[0048] 100. Needle roller bearings;

[0049] 200, shell, 200a, fairway;

[0050] 300, tripod, 300a, journal;

[0051] 1000. Universal joint assembly;

[0052] 2000. Drive shaft.

[0053] The above drawings show clear embodiments of the present disclosure, which will be described in more detail below. These drawings and text descriptions are not intended to limit the scope of the present disclosure in any way, but to illustrate the concepts of the present disclosure to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0054] In order to make the objectives, technical solutions and advantages of the present disclosure more clear, the embodiments of the present disclosure will be further described in detail below with reference to the accompanying drawings.

[0055] The terms used in the embodiments of the present disclosure are only used to explain the embodiments of the present disclosure, and are not intended to limit the present disclosure. Unless otherwise defined, the technical terms or scientific terms used herein should be understood by people with ordinary skills in the field to which the present disclosure belongs. The words "first", "second", "third" and similar words used in the patent application specification and claims of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "one" do not indicate a quantity limit, but indicate that there is at least one. Words such as "include" or "include" mean that the elements or objects appearing in front of "include" or "include" include the elements or objects listed after "include" or "include" and their equivalents, and do not exclude other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0056] like Figure 1 As shown, the universal joint assembly 1000 is an important transmission component in a vehicle, which is used to evenly transmit the vehicle's transmission shaft 2000 to the reduction gear in the main transmission within a certain angle range. Figure 2 As shown, the universal joint assembly 1000 includes a housing 200, a tripod 300 and three needle bearings 100. The three needle bearings 100 are respectively connected to the three journals 300a of the tripod 300, and the needle bearings 100 and the tripod 300 are installed in the ball track 200a of the housing 200. Among them, the needle bearings 100 play a major role in affecting the transmission efficiency of the universal joint assembly 1000.

[0057] In related technologies, such as Figure 3As shown, the needle roller bearing comprises an outer ring 1, a plurality of needle rollers 2, an inner ring 3 and two retaining rings 4. Both ends of the inner side of the outer ring 1 have slots 10. The two retaining rings 4 are respectively located in the two slots 10, the needle rollers 2 and the inner ring 3 are located between the two slots 10, and the plurality of needle rollers 2 are located between the outer ring 1 and the inner ring 3.

[0058] However, the needle roller bearing 100 in the related art has more friction pairs, which causes the temperature of the needle roller bearing 100 to rise faster and results in lower transmission efficiency of the needle roller bearing 100 .

[0059] In view of the above technical problems, the embodiment of the present disclosure provides a needle roller bearing, in which the friction pairs are less, thereby improving the transmission efficiency of the needle roller bearing 100. The needle roller bearing 100 provided by the embodiment of the present disclosure is exemplarily described below.

[0060] Needle roller bearing 100 is used in universal joint components, such as Figure 4 and Figure 5 As shown, the needle roller bearing comprises an outer ring 1, a plurality of needle rollers 2 and an inner ring 3. The inner wall of the outer ring 1 has a first convex ring 11 and a second convex ring 12, and the first convex ring 11 and the second convex ring 12 are arranged at intervals along the axial direction of the outer ring 1. The inner ring 3 comprises a first part 301 and a second part 302 arranged along the axial direction, the outer ring 1 surrounds the first part 301, and the second part 302 is located outside the outer ring 1. The outer wall of the second part 302 has a third convex ring 31, and the third convex ring 31 and the first convex ring 11 are abutted. Assuming that the inner diameter of the first convex ring 11 is D1 and the outer diameter of the first part 301 is D2, then 0.2mm≤D1-D2≤0.5mm. The plurality of needle rollers 2 are located between the first convex ring 11 and the second convex ring 12, and are evenly arranged along the circumference of the outer ring 1, and the plurality of needle rollers 2 are located between the outer ring 1 and the first part 301.

[0061] When the needle roller bearing 100 is working, the axis of the inner ring 3 and the axis of the outer ring 1 do not completely coincide with each other, and there may be a distance or a deflection angle between the two axes.

[0062] The outer wall of the outer ring 1 is in an arc shape.

[0063] In the technical solution provided by the embodiment of the present disclosure, the third convex ring 31 of the inner ring 3 and the first convex ring 11 of the outer ring 1 abut against each other, thereby limiting the inner ring 3. Since the inner diameter of the first convex ring 11 and the outer diameter of the first part 301 are slightly different, and the axes of the inner ring 3 and the outer ring 1 do not completely overlap during use, the inner ring 3 is not easy to be separated from the outer ring 1. Therefore, there is no need to use other positioning members (such as retaining rings) to limit the inner ring 3. Thereby, the number of parts in the needle roller bearing 100 is reduced, and the friction pairs in the needle roller bearing 100 are further reduced. In this way, the temperature rise of the needle roller bearing 100 can be reduced, and it is beneficial to improve the transmission efficiency of the needle roller bearing 100.

[0064] Moreover, since two parts are reduced, the manufacturing cost of the needle roller bearing 100 can be reduced. Meanwhile, compared with the related art, the outer ring 1 does not need to be provided with a slot 10 for limiting the retaining ring 4, thereby simplifying the manufacturing process of the outer ring 1 and reducing the processing steps of the outer ring 1.

[0065] In addition, in the related art, when assembling the needle roller bearing 100, a retaining ring 4 is first installed into the slot 10, and the inner diameter of the retaining ring 4 is smaller than the inner diameter of the inner ring 3. Then, the needle roller 2 and the inner ring 3 are placed inside the outer ring, and the needle roller 2 is located between the outer ring 1 and the inner ring 3. Finally, another retaining ring 4 is installed into another slot 10 of the outer ring 1, so that the two retaining rings 4 limit the needle roller 2 and the inner ring 3, thereby completing the assembly of the needle roller bearing.

[0066] When assembling the needle roller bearing 100 in the embodiment of the present disclosure, the number of parts is reduced, so the assembly steps are fewer. When assembling the needle roller bearing 100, first install the needle roller 2 between the first convex ring 11 and the second convex ring 12 of the outer ring 1. Then, extend the first part 301 of the inner ring 3 into the inner side of the outer ring 1, and make the third convex ring 31 of the inner ring 3 and the side wall of the first convex ring 11 of the outer ring 1 abut against each other. It can be seen that compared with the related art, the needle roller bearing provided in the embodiment of the present disclosure has fewer assembly steps, simplifies the assembly process, and thus improves the assembly efficiency of the needle roller bearing 100.

[0067] In some examples, such as Figure 6 As shown, 30.8 mm ≤ D1 ≤ 31.2 mm, 30.4 mm ≤ D2 ≤ 31.6 mm. It can be understood that, since the needle roller bearing 100 is used in a universal joint assembly, the specific size of D1 can be set accordingly according to the size of the journal 300 a of the tripod 300 .

[0068] In some examples, the inner diameter of the first convex ring 11 is equal to the inner diameter of the second convex ring 12 , so that the processing technology of the outer ring 1 is relatively simple.

[0069] In some examples, such as Figure 5 and Figure 6 As shown, the outer wall of the inner ring 3 also has a groove 32. The groove 32 is located in the first part 301, and the groove 32 is opposite to the first convex ring 11. In this way, a large gap can be provided between the outer wall of the groove 32 and the inner wall of the first convex ring 11, thereby avoiding friction between the groove 32 and the first convex ring 11, which is beneficial to improving the transmission efficiency of the needle roller bearing 100.

[0070] In some examples, such as Figure 6As shown, assuming that the diameter of the groove 32 is D3, 1.2mm≤D1-D3≤1.5mm. If D1-D3 is too small, the gap between the outer wall of the groove 32 and the inner wall of the first convex ring 11 will be reduced. When the inner ring 3 is offset in the outer ring 1, the outer wall of the groove 32 may contact the inner wall of the first convex ring 11, thereby increasing the friction pair in the needle roller bearing. If D1-D3 is too large, on the one hand, the inner diameter D1 of the first convex ring 11 will be too large, that is, the protruding part of the first convex ring 11 is too small, thereby affecting the positioning of the needle roller 2. On the other hand, the outer diameter D3 of the groove 32 will be too small, that is, the radial width of the groove 32 will be small, thereby reducing the connection strength between the first part 301 and the third convex ring 31.

[0071] In some examples, such as Figure 6 As shown, assuming that the width of the first convex ring 11 along the axial direction is H1, and the width of the groove 32 along the axial direction is H2, then H2≥H1. In this way, it is possible to prevent the outer wall of the first convex ring 11 and the inner wall of the groove 32 from colliding and contacting each other.

[0072] For example, Figure 6 As shown, 1.25 mm ≤ H1 ≤ 1.35 mm, thereby preventing the width of the outer ring 1 from being too large in the axial direction.

[0073] For example, Figure 6 As shown, 1.45 mm ≤ H2 ≤ 1.55 mm, which can prevent the inner ring 3 from having an excessively large axial width.

[0074] like Figure 5 As shown, since the inner ring 3 needs to form a spherical pair with the journal 300a of the tripod 300, the inner ring 3 needs to be finely machined. When the needle roller bearing 100 is used in a universal joint assembly, the inner ring 3 of the needle roller bearing 100 is connected to the journal 300a of the tripod 300. The outer wall of the journal 300a and the inner wall of the first part 301 of the inner ring 3 have an interference fit, so only the inner wall of the first part 301 needs to be finely machined, which can reduce the difficulty and complexity of the processing.

[0075] In some examples, in order to facilitate the fine machining of the first part 301, the inner wall of the first part 301 has a fourth convex ring 33, the fourth convex ring 33 is located between the first convex ring 11 and the second convex ring 12, and the fourth convex ring 33 is used to abut against the journal 300a of the tripod 300. In this way, when the fourth convex ring 33 is finely machined using a tool, other parts will not hinder the operation of the tool.

[0076] Exemplarily, the inner diameter of the fourth protruding ring 33 may be 23.5 mm-24 mm, and the inner diameter of the first protruding ring 11 may be 24 mm-24.5 mm.

[0077] Exemplarily, the width of the fourth protruding ring 33 along the axial direction may be equal to the distance between the first protruding ring 11 and the second protruding ring 12 .

[0078] In some examples, such as Figure 5 and Figure 6 As shown, one end of the first portion 301 close to the second convex ring 12 is flush with one end of the needle roller 2 close to the second convex ring 12. That is, the first portion 301 is in contact with the needle roller 2 only, but not with the first convex ring 11 and the second convex ring 12. This avoids the friction resistance caused by the contact between the first portion 301 and the first convex ring 11 and the second convex ring 12 when the needle roller bearing 100 is working, which is beneficial to improve the transmission efficiency of the needle roller bearing 100.

[0079] In some examples, such as Figure 6 As shown, assuming that the outer diameter of the third convex ring 31 is D4, then 34mm≤D4≤35mm. If the outer diameter D4 of the third convex ring 31 is too small, when the axis of the inner ring 3 deflects or shifts relative to the axis of the outer ring 1, the third convex ring 31 may extend into the inner wall of the outer ring 1, resulting in the third convex ring 31 being unable to limit the inner ring 3. If the outer diameter D4 of the third convex ring 31 is too large, the manufacturing cost of the inner ring 3 will increase, thereby increasing the manufacturing cost of the needle roller bearing 100. In addition, if the outer diameter D4 of the third convex ring 31 is too large, the weight of the needle roller bearing 100 will also be relatively large.

[0080] In some examples, such as Figure 6 As shown in the figure, assuming that the width of the third convex ring 31 in the axial direction is L1, then 1mm≤L1≤1.5mm. If L1 is too small, the strength of the third convex ring 31 will be low, and it will be difficult to ensure that the third convex ring 31 plays a limiting role on the inner ring 3. If L1 is too large, the width of the needle roller bearing 100 in the axial direction will be large, making the volume of the needle roller bearing 100 larger, which is not conducive to the arrangement of the needle roller bearing 100 and will increase the manufacturing cost of the needle roller bearing 100. In addition, the weight of the needle roller bearing 100 will be large.

[0081] Compared with the related art, the needle roller bearing 100 provided in the embodiment of the present disclosure does not have a retaining ring 4, so there is no need to set a groove 10 for limiting the retaining ring 4 on the outer ring 1. In this way, it is helpful to reduce the width of the outer ring 1 along the axial direction, thereby reducing the manufacturing cost of the outer ring 1 and simplifying the manufacturing process of the outer ring 1. In addition, it is also helpful to reduce the overall volume of the needle roller bearing 100.

[0082] For example, Figure 6 As shown, assuming that the axial width of the outer ring 1 is L2, then 1mm≤L2≤1.5mm. Compared with the outer ring 1 of the needle roller bearing in the prior art, the axial width of the outer ring 1 provided in the embodiment of the present disclosure is smaller.

[0083] The present disclosure also provides a universal joint assembly, such as Figure 2 As shown, the universal joint assembly 1000 includes a housing 200, a tripod 300 and the needle bearing 100. Figure 7 and Figure 8 As shown, the tripod 300 has three journals 300a, and the three journals 300a are respectively connected to the inner rings 3 of the three needle roller bearings 100. The housing 200 has three ball tracks 200a, and the outer rings of the three needle roller bearings 100 are respectively connected to the inner walls of the three ball tracks 200a.

[0084] The universal joint assembly 1000 may also be referred to as a constant velocity universal joint.

[0085] The assembly formed by the tripod bracket 300 and the needle bearing 100 may be referred to as a tripod assembly.

[0086] When assembling the universal joint assembly, firstly, the three assembled needle bearings 100 are respectively pressed onto the three journals 300a of the tripod 300, and a spherical pair is formed between the journal 300a and the inner ring 3 of the needle bearing 100. Then, the assembled needle bearing 100 and the tripod 300 are integrally installed into the ball track 200a of the housing 200.

[0087] The technical solution provided by the embodiment of the present disclosure has fewer friction pairs in the needle bearing 100 in the universal joint assembly 1000. Therefore, when the universal joint assembly has a swing angle, the force of the inner ring 3 on the needle roller 2 and the outer ring 1 can be reduced, thereby reducing the axial derived force generated by the sliding of the tripod 300 in the ball track 200a of the housing 200, thereby reducing the risk of NVH (Noise, Vibration, Harshness) problems such as low-speed yaw and high-speed jitter in the whole vehicle.

[0088] In some examples, the outer ring 1 of the needle roller bearing 100 and the ball track 200a of the housing 200 are in two-point contact, such as Fig. 9 As shown, point A and point B are the contact points between the outer ring 1 and the ball track 200a. In this way, on the one hand, the stress on the outer ring 1 can be reduced, which is conducive to extending the life of the needle roller bearing 100. On the other hand, a gap can be created between the outer ring 1 and the ball track 200a, which makes it easier to add grease to the gap. Thus, the outer ring 1 and the ball track 200a are lubricated, which is conducive to reducing the friction between the outer ring 1 and the ball track 200a, and further can improve the transmission efficiency of the universal joint assembly 1000.

[0089] The embodiment of the present disclosure further provides a vehicle, which includes the universal joint assembly 1000 described above.

[0090] The present disclosure does not specifically limit the type of vehicle, for example, a sedan, a bus, a truck, a sport utility vehicle (SUV), etc.

[0091] like Figure 1 As shown, the universal joint assembly 1000 is used to connect with the transmission shaft 2000 of the vehicle, so as to evenly transmit the transmission shaft 2000 to the reduction gear in the main transmission within a certain angle range.

[0092] The technical solution provided by the embodiment of the present disclosure is that the axial derived force generated by the sliding of the tripod 300 in the universal joint assembly 1000 in the vehicle in the ball track 200a of the housing 200 is relatively small, so the vehicle is not prone to low-speed yaw and high-speed jitter, thereby improving the NVH (Noise, Vibration, Harshness) performance of the vehicle.

[0093] The above description is only an optional embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the principles of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A needle roller bearing, characterized in that: The needle roller bearing is applied to a universal joint assembly; The needle roller bearing comprises an outer ring (1), a plurality of needle rollers (2) and an inner ring (3); The inner wall of the outer ring (1) has a first convex ring (11) and a second convex ring (12), and the first convex ring (11) and the second convex ring (12) are arranged at intervals along the axial direction of the outer ring (1); The inner ring (3) comprises a first part (301) and a second part (302) arranged in the axial direction, the outer ring (1) is annularly arranged on the first part (301), the second part (302) is located outside the outer ring (1), the outer wall of the second part (302) has a third convex ring (31), the third convex ring (31) and the first convex ring (11) are in contact with each other, assuming that the inner diameter of the first convex ring (11) is D1 and the outer diameter of the first part (301) is D2, then 0.2 mm ≤ D1-D2 ≤ 0.5 mm; The plurality of needle rollers (2) are located between the first convex ring (11) and the second convex ring (12), and are evenly arranged along the circumference of the outer ring (1); the plurality of needle rollers (2) are located between the outer ring (1) and the first part (301).

2. The needle roller bearing according to claim 1, characterized in that: The outer wall of the inner ring (3) also has a groove (32); The groove (32) is located in the first part (301), and the groove (32) is opposite to the first protruding ring (11).

3. The needle roller bearing according to claim 2, characterized in that: Assuming that the diameter of the groove (32) is D3, 1.2 mm ≤ D1 - D3 ≤ 1.5 mm.

4. The needle roller bearing according to claim 2, characterized in that: The inner wall of the first part (301) has a fourth convex ring (33), the fourth convex ring (33) is located between the first convex ring (11) and the second convex ring (12), and the fourth convex ring (33) is used to abut against the journal (300a) of the tripod (300).

5. The needle roller bearing according to claim 1, characterized in that: One end of the first part (301) close to the second convex ring (12) is flush with one end of the rolling needle (2) close to the second convex ring (12).

6. The needle roller bearing according to claim 1, characterized in that: Assuming that the outer diameter of the third convex ring (31) is D4, 34 mm ≤ D4 ≤ 35 mm.

7. The needle roller bearing according to claim 1, characterized in that: Assuming that the width of the third convex ring (31) along the axial direction is L1, then 1mm≤L1≤1.5mm.

8. The needle roller bearing according to any one of claims 1 to 7, characterized in that: Assuming that the width of the outer ring (1) along the axial direction is L2, then 11 mm ≤ L2 ≤ 14 mm.

9. A universal joint assembly, characterized in that: The universal joint assembly comprises a housing (200), a tripod (300) and three needle roller bearings (100) according to any one of claims 1 to 8; The tripod (300) has three journals (300a), and the three journals (300a) are respectively connected to the inner rings (3) of the three needle roller bearings (100); The housing (200) has three ball tracks (200a), and the outer rings of the three needle roller bearings (100) are respectively connected to the inner walls of the three ball tracks (200a).

10. A vehicle, characterized in that: The vehicle includes the universal joint assembly of claim 9.

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