Fixed knot assembly and vehicle

Abstract

The utility model provides a fixed joint assembly and a vehicle, which belong to the technical field of vehicle parts, and comprise a shaft lever, a fixed joint main body, a check ring and a pre-tightening expansion sleeve, the shaft rod is connected with an inner star wheel in the fixing joint body in a front-back inserted mode, a first check ring groove is formed in the shaft rod, a second check ring groove is formed in the inner star wheel, and check rings are clamped into the first check ring groove and the second check ring groove respectively. The pre-tightening expansion sleeve is arranged on the periphery of the shaft rod in a sleeving mode, the rear side of the pre-tightening expansion sleeve abuts against the shaft rod, and the front side of the pre-tightening expansion sleeve abuts against the inner star wheel so that the front side wall of the first check ring groove and the rear side wall of the second check ring groove can be matched to clamp the check ring. According to the fixed joint assembly and the vehicle, due to the fact that displacement of the check ring is limited by the front side wall of the first check ring groove and the rear side wall of the second check ring groove, the degree of freedom of axial movement of the check ring is actually eliminated, and then the problem of axial movement between the shaft rod and the inner star wheel is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of vehicle components, and in particular relates to a fixed joint assembly and a vehicle. Background Art

[0002] The drive shaft is used to transmit the torque output by the power source to the wheels. The drive shaft is mainly composed of a fixed joint, a movable joint, a shaft rod, a clamp and a sleeve. Among them, the fixed joint is mainly composed of an inner star wheel, a retaining frame, a steel ball and an outer ball cage. The inner star wheel is connected to the shaft rod to ensure that the drive shaft can transmit torque and other functions under high-speed operation.

[0003] In the fixed joint assembly, the inner star wheel has an inner spline, the shaft rod has an outer spline, and retaining ring grooves are respectively provided on the inner star wheel and the outer star wheel. The circumferential limitation is achieved between the shaft rod and the inner star wheel by the inner and outer splines, and the axial limitation is achieved by the retaining ring inserted into the retaining ring groove, thereby limiting the axial movement of the inner star wheel and the intermediate shaft, ensuring that the shaft rod will not fall out of the inner star wheel of the fixed joint during the movement of the vehicle, and can transmit power smoothly.

[0004] In order to ensure that the retaining ring can be smoothly opened between the retaining ring groove of the inner star wheel and the retaining ring groove of the shaft rod during assembly, the groove width of the retaining ring groove is larger than the thickness of the retaining ring, that is, the retaining ring and the retaining ring groove are matched with clearance in the axial direction of the shaft rod, which leads to a large amount of axial movement after the fixed joint and the shaft rod are assembled. At present, the interference fit between the involute external spline of the shaft rod and the involute internal spline of the inner star wheel is mainly used to reduce the impact of axial movement, but the improvement effect of this method is limited. The axial movement problem between the fixed joint and the shaft rod still has a large negative impact on the overall stability of the drive shaft. Utility Model Content

[0005] The embodiment of the utility model provides a fixed joint assembly and a vehicle, aiming to solve the problem of axial movement between the central shaft and the inner star wheel in the prior art.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] In a first aspect, an embodiment of the utility model provides a fixed joint assembly, comprising:

[0008] Shaft rod, fixed joint body, retaining ring and pre-tightening sleeve;

[0009] The shaft rod is plugged into the inner star wheel in the fixed joint body in front and back, the shaft rod is provided with a first retaining ring groove, the inner star wheel is provided with a second retaining ring groove, and the retaining rings are respectively inserted into the first retaining ring groove and the second retaining ring groove;

[0010] The pre-tightening sleeve is sleeved on the outer circumference of the shaft, and the rear side abuts against the shaft, and the front side of the pre-tightening sleeve abuts against the inner star wheel, so that the front side wall of the first retaining ring groove and the rear side wall of the second retaining ring groove cooperate to clamp the retaining ring.

[0011] In combination with the first aspect, in a possible implementation, a avoidance groove is formed on the rear side of the inner star wheel, and the avoidance groove has a second pre-tightening bevel; the pre-tightening expansion sleeve has a first pre-tightening bevel arranged forward, and the first pre-tightening bevel is arranged at an angle to the center axis of the shaft rod, and the first pre-tightening bevel corresponds to and fits with the second pre-tightening bevel.

[0012] In some embodiments, the first pre-tightening bevel is arranged on the outer periphery of the pre-tightening sleeve, the distance between the first pre-tightening bevel and the shaft gradually increases from front to back, the outer side wall of the avoidance groove is the second pre-tightening bevel, and the distance between the second pre-tightening bevel and the central axis of the inner star wheel gradually increases from front to back; or

[0013] The first pre-tightening bevel is arranged on the inner circumference of the pre-tightening sleeve, and the distance between the first pre-tightening bevel and the shaft rod gradually decreases from front to back. The inner side wall of the avoidance groove is the second pre-tightening bevel, and the distance between the second pre-tightening bevel and the central axis of the inner star wheel gradually decreases from front to back.

[0014] In some embodiments, the first pre-tightening inclined surface is a conical surface continuously distributed along the circumference of the pre-tightening sleeve, and the second pre-tightening inclined surface is a conical surface continuously distributed along the circumference of the inner star wheel.

[0015] In combination with the first aspect, in a possible implementation, a limiting shoulder is provided on the shaft rod, the limiting shoulder abuts against the rear side of the preload sleeve, and a transition slope is provided between the limiting shoulder and the main body of the shaft rod, and the transition slope gradually shrinks from front to back.

[0016] In combination with the first aspect, in a possible implementation, the first retaining ring groove has a rear groove section and a front groove section connected in sequence from rear to front, the inner diameter of the rear groove section is defined as D1, the inner diameter of the front groove section is defined as D2, the inner diameter of the retaining ring in a free state is defined as D3, and D1<D3≤D2;

[0017] The front side wall of the front groove section cooperates with the rear side wall of the second retaining ring groove to clamp the retaining ring.

[0018] In some embodiments, the width of the rear slot section is greater than the width of the front slot section.

[0019] In some embodiments, in a direction toward the central axis of the inner star wheel, a rear side wall of the second retaining ring groove gradually inclines forward.

[0020] In some embodiments, a front edge of an outer peripheral wall of the second retaining ring groove is flush with a front end surface of the inner star wheel.

[0021] Compared with the prior art, the scheme shown in the embodiment of the present application is that after the inner star wheel in the fixed joint body is plugged into the shaft, the axial limit between the shaft and the inner star wheel is achieved by the clamping of the retaining ring with the first retaining ring groove and the second retaining ring groove. In order to facilitate assembly, the widths of the first retaining ring groove and the second retaining ring groove are both greater than the wire diameter of the retaining ring. Based on this, the rear side of the pre-tightening sleeve abuts against the shaft, and the front side abuts against the inner star wheel. The pre-tightening sleeve pushes the inner star wheel forward. After assembly, the front side wall of the first retaining ring groove and the rear side wall of the second retaining ring groove cooperate to clamp the retaining ring; because the front side wall of the first retaining ring groove and the rear side wall of the second retaining ring groove limit the displacement of the retaining ring, the freedom of the retaining ring to move axially is actually eliminated, thereby avoiding the problem of axial movement between the shaft and the inner star wheel.

[0022] In a second aspect, an embodiment of the utility model further provides a vehicle, comprising the above-mentioned fixed joint assembly.

[0023] Compared with the prior art, the solution shown in the embodiment of the present application effectively avoids the problem of axial movement between the shaft rod and the inner star wheel by adopting the above-mentioned fixed joint assembly, improves the stability and reliability of the use of the drive shaft, and further improves the smoothness of the driving process and the driving experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A cross-sectional view of the internal structure of the fixed joint assembly provided in the first embodiment of the utility model;

[0025] Figure 2 for Figure 1 A magnified view of part A;

[0026] Figure 3 for Figure 1 A magnified view of the section B of FIG.

[0027] Figure 4 for Figure 3 The first retaining ring groove, the second retaining ring groove and the matching diagram of the retaining ring are shown;

[0028] Figure 5 The explosive decomposition of the shaft rod, pre-tightening sleeve and inner star wheel used in the first embodiment of the utility model Figure 1 ;

[0029] Figure 6 The explosive decomposition of the shaft rod, pre-tightening sleeve and inner star wheel used in the first embodiment of the utility model Figure 2 ;

[0030] Figure 7 This is an adaptation diagram of the shaft rod, pre-tightening sleeve and inner star wheel used in the second embodiment of the present utility model;

[0031] Figure 8 This is an adaptation diagram of the first retaining ring groove, the second retaining ring groove and the retaining ring used in the first embodiment of the utility model;

[0032] Description of reference numerals:

[0033] 1. Shaft; 110. Limiting shoulder; 120. Transition slope; 2. Fixed joint body; 210. Inner star wheel; 220. Outer star wheel; 230. Steel ball; 240. Retaining frame; 3. Retaining ring; 4. Preload expansion sleeve; 410. First preload slope; 5. First retaining ring groove; 510. Rear groove section; 520. Front groove section; 6. Second retaining ring groove; 7. Avoidance groove; 710. Second preload slope. DETAILED DESCRIPTION

[0034] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0035] In the claims, specification and the above-mentioned drawings of the utility model, unless otherwise clearly defined, the use of terms such as "first", "second" or "third" etc. is to distinguish different objects rather than to describe a specific order.

[0036] In the claims, specification and the above-mentioned drawings of the utility model, unless otherwise explicitly defined, directional words, such as the terms "center", "lateral", "longitudinal", "horizontal", "vertical", "top", "bottom", "inside", "outside", "up", "down", "front", "back", "left", "right", "clockwise", "counterclockwise", "high", "low", etc., indicating directions or positional relationships are based on the directions and positional relationships shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the specific protection scope of the utility model.

[0037] In the claims, specification and the above drawings of the utility model, unless otherwise clearly defined, if the term "fixed connection" or "fixed connection" is used, it should be understood in a broad sense, that is, any connection method without a displacement relationship and relative rotation relationship between the two, that is to say, including non-detachable fixed connection, detachable fixed connection, integrated connection and fixed connection through other devices or elements.

[0038] In the claims, specification and drawings of the present utility model, if the terms "include", "have" and their variations are used, they are intended to mean "including but not limited to".

[0039] Please also read Figures 1 to 7 , the fixed joint assembly provided by the utility model is now described. The fixed joint assembly includes a shaft 1, a fixed joint body 2, a retaining ring 3 and a pre-tightening sleeve 4; the shaft 1 is plugged into the inner star wheel 210 in the fixed joint body 2 in front and back, the shaft 1 is provided with a first retaining ring groove 5, the inner star wheel 210 is provided with a second retaining ring groove 6, and the retaining ring 3 is respectively inserted into the first retaining ring groove 5 and the second retaining ring groove 6; the pre-tightening sleeve 4 is sleeved on the outer periphery of the shaft 1, and the rear side abuts the shaft 1, and the front side of the pre-tightening sleeve 4 abuts the inner star wheel 210, so that the front side wall of the first retaining ring groove 5 and the rear side wall of the second retaining ring groove 6 cooperate to clamp the retaining ring 3.

[0040] In this embodiment, the direction in which the shaft 1 is inserted into the inner star wheel 210 is the forward direction, and vice versa, it is the backward direction. The central axis of the shaft 1 and the central axis of the inner star wheel 210 are both parallel to the front-to-back direction; the direction along the radial direction of the shaft 1 pointing to the central axis of the shaft 1 is the inward direction, and vice versa, it is the outward direction.

[0041] In this embodiment, the shaft rod 1 itself has an axial limiting structure that abuts against the rear side of the pre-tightening sleeve 4. The axial limiting structure can be integrally formed with the shaft rod 1, or it can be a separate structure from the shaft rod 1 and fixed on the shaft rod 1 by means of snap-fitting or the like.

[0042] In this embodiment, the fixed joint body 2 includes an outer star wheel 220, a steel ball 230, a retainer 240 and an inner star wheel 210. The outer star wheel 220 has an opening at the rear side, and the inner star wheel 210 is arranged in the inner cavity of the outer star wheel 220. A plurality of steel balls 230 are arranged between the outer star wheels 220 and the outer star wheels 220. The retainer 240 is also arranged between the outer star wheels 220 and the outer star wheels 220, and keeps the relative positions of the plurality of steel balls 230 unchanged. In this embodiment, the inner star wheel 210 is provided with an inner spline, and the shaft 1 is provided with an outer spline. The inner spline and the outer spline are adapted to limit the relative displacement of the shaft 1 and the inner star wheel 210 in the circumferential direction of the shaft 1; the inner spline and the outer spline can adopt the design method of ordinary splines, or the design method of involute splines.

[0043] In this embodiment, the pre-tightening sleeve 4 can be a rigid component (such as a metal component) or a component with a certain elasticity to realize the function of elastic pushing and play a buffering role on the inner star wheel 210 to a certain extent. If the pre-tightening sleeve 4 is made of elastic material (such as rubber), a rigid frame (such as a metal frame) can be set inside the pre-tightening sleeve 4 so that the pre-tightening sleeve 4 has the necessary rigidity to ensure effective pushing of the inner star wheel 210.

[0044] In this embodiment, in the free state, the cross section of the retaining ring 3 can be circular, elliptical, rectangular or the like.

[0045] In this embodiment, the inner circumference of the pre-tightening sleeve 4 is tightly fitted with the outer circumference of the shaft rod 1 , that is, the pre-tightening sleeve 4 and the shaft rod 1 are interference fit to prevent the pre-tightening sleeve 4 from being displaced radially along the shaft rod 1 .

[0046] Compared with the prior art, the fixed joint assembly provided in this embodiment has the following features: after the inner star wheel 210 in the fixed joint body 2 is plugged into the shaft 1, the axial limit between the shaft 1 and the inner star wheel 210 is achieved by the clamping of the retaining ring 3 with the first retaining ring groove 5 and the second retaining ring groove 6. For the convenience of assembly, the widths of the first retaining ring groove 5 and the second retaining ring groove 6 are both greater than the wire diameter of the retaining ring 3. Based on this, the rear side of the pre-tightening sleeve 4 abuts against the shaft 1, and the front side abuts against the inner star wheel 210. The pre-tightening sleeve 4 pushes the inner star wheel 210 forward. After the assembly is completed, the front side wall of the first retaining ring groove 5 and the rear side wall of the second retaining ring groove 6 cooperate to clamp the retaining ring 3; since the front side wall of the first retaining ring groove 5 and the rear side wall of the second retaining ring groove 6 limit the displacement of the retaining ring 3, the freedom of the retaining ring 3 to move axially is actually eliminated, thereby avoiding the problem of axial movement between the shaft 1 and the inner star wheel 210.

[0047] In some embodiments, the inner star wheel 210 and the pre-tightening sleeve 4 can be used as follows: Figure 2 , Figure 5 and Figure 7 See the structure shown. Figure 2 , Figure 5 and Figure 7 A avoidance groove 7 is formed on the rear side of the inner star wheel 210, and the avoidance groove 7 has a second pre-tightening inclined surface 710; the pre-tightening expansion sleeve 4 has a first pre-tightening inclined surface 410 arranged forward, and the first pre-tightening inclined surface 410 is arranged at an angle to the central axis of the shaft 1, and the first pre-tightening inclined surface 410 is correspondingly fitted with the second pre-tightening inclined surface 710.

[0048] Since the first preload bevel 410 and the second preload bevel 710 are both inclined planes inclined to the central axis of the shaft 1, the tensioning force applied by the first preload bevel 410 can be decomposed into an axial force along the central axis of the shaft 1 and a radial force along the radial direction of the shaft 1 on the second preload bevel 710, wherein the axial force pushes the inner star wheel 210 forward, so that the inner star wheel 210 has a preload in the same direction as the insertion direction of the shaft 1, that is, the axial force plays an actual tensioning role. Based on this, even if the first preload bevel 410 and the second preload bevel 710 are in close contact due to manufacturing and assembly errors, the axial force will not be greatly increased, thereby avoiding the problem of the retaining ring 3 being disengaged from the second retaining ring groove 6 due to excessive tensioning force.

[0049] In addition, there are axial errors and radial errors between the inner star wheel 210 and the preload sleeve 4. Since the first preload bevel 410 and the second preload bevel 710 are both bevels inclined to the center axis of the shaft 1, the bevel contact method can also absorb the axial error and radial error well, so that the first preload bevel 410 and the second preload bevel 710 can maintain effective contact, ensuring that the preload sleeve 4 can provide reliable tensioning force.

[0050] In some arrangements of the first preloaded inclined surface 410 and the second preloaded inclined surface 710, see Figure 2 The first pre-tightening bevel 410 is arranged on the outer periphery of the pre-tightening sleeve 4, and the distance between the first pre-tightening bevel 410 and the shaft 1 gradually increases from front to back; correspondingly, the outer wall of the avoidance groove 7 is the second pre-tightening bevel 710, and the distance between the second pre-tightening bevel 710 and the central axis of the inner star wheel 210 gradually increases from front to back. In this embodiment, the tensioning force applied by the first pre-tightening bevel 410 can be decomposed into a forward axial force and an outward radial force on the second pre-tightening bevel 710. At the same time, the second pre-tightening bevel 710 also provides a corresponding reaction force (i.e., pushing the first pre-tightening bevel 410 backward and inward). Based on this, the cross-section of the pre-tightening sleeve 4 is wedge-shaped, and the inner circumferential surface area of ​​the pre-tightening sleeve 4 is larger, so it can fit more fully with the shaft rod 1. As the first pre-tightening bevel 410 and the second pre-tightening bevel 710 fit closely together, the pre-tightening sleeve 4 can be pressed tightly against the outer periphery of the shaft rod 1 by the second pre-tightening bevel 710, thereby ensuring the stability of the position of the pre-tightening sleeve 4.

[0051] In other arrangements of the first pre-tightening inclined surface 410 and the second pre-tightening inclined surface 710, see Figure 7 , the first pre-tightening bevel 410 is arranged on the inner circumference of the pre-tightening sleeve 4, and the distance between the first pre-tightening bevel 410 and the shaft rod 1 gradually decreases from front to back; correspondingly, the inner side wall of the avoidance groove 7 is the second pre-tightening bevel 710, and the distance between the second pre-tightening bevel 710 and the central axis of the inner star wheel 210 gradually decreases from front to back. In this embodiment, the tensioning force applied by the first pre-tightening bevel 410 can be decomposed into a forward axial force and an inward radial force on the second pre-tightening bevel 710. At the same time, the second pre-tightening bevel 710 also provides a corresponding reaction force (i.e., pushing the first pre-tightening bevel 410 backward and outward). Based on this, the cross-section of the pre-tightening sleeve 4 is roughly a right-angled trapezoid with a narrow inside and a wide outside. The straight surface on the rear side abuts against the axial limiting structure on the shaft rod 1, and the narrower inner circumference contacts the outer circumference of the shaft rod 1.

[0052] In some embodiments, in order to make the force between the pre-tightening sleeve 4 and the inner star wheel 210 uniform, the first pre-tightening inclined surface 410 is evenly distributed along the circumference of the pre-tightening sleeve 4, and correspondingly, the second pre-tightening inclined surface 710 is evenly distributed along the circumference of the inner star wheel 210.

[0053] In order to meet the above requirements, in some specific distribution modes of the first pre-tightening inclined surface 410 and the second pre-tightening inclined surface 710, see Figure 5 and Figure 6 The first pre-tightening inclined surface 410 is a conical surface continuously distributed along the circumference of the pre-tightening sleeve 4, and the second pre-tightening inclined surface 710 is a conical surface continuously distributed along the circumference of the inner star wheel 210. This design method makes the pre-tightening sleeve 4 have good structural consistency in its own circumference, and the design and manufacturing difficulty are low. The inner star wheel 210 also has a similar principle.

[0054] In order to meet the above requirements, in other specific distribution modes of the first pre-tightening bevel 410 and the second pre-tightening bevel 710, the first pre-tightening bevel 410 is a conical surface intermittently distributed along the circumference of the pre-tightening sleeve 4, and the second pre-tightening bevel 710 is a conical surface intermittently distributed along the circumference of the inner star wheel 210. In this embodiment, a plurality of first pre-tightening bevels 410 are evenly arranged along the circumference of the pre-tightening sleeve 4, and a plurality of second pre-tightening bevels 710 are evenly arranged along the circumference of the inner star wheel 210.

[0055] In order to meet the above requirements, in some specific distribution modes of the first pre-tightening bevel 410 and the second pre-tightening bevel 710, the first pre-tightening bevel 410 is a plane intermittently distributed along the circumference of the pre-tightening sleeve 4, and the second pre-tightening bevel 710 is a plane intermittently distributed along the circumference of the inner star wheel 210. In this embodiment, a plurality of first pre-tightening bevels 410 are evenly arranged along the circumference of the pre-tightening sleeve 4, and a plurality of second pre-tightening bevels 710 are evenly arranged along the circumference of the inner star wheel 210.

[0056] In some embodiments, in order to achieve abutment with the rear side of the pre-tightening sleeve 4, see Figure 1 and Figure 2 , Figure 5 and Figure 7 The shaft rod 1 is provided with a limiting shoulder 110, which abuts against the rear side of the preload sleeve 4. The limiting shoulder 110 and the main body of the shaft rod 1 are transitioned through a transition slope 120, and the transition slope 120 gradually shrinks from front to back. By setting the transition slope 120, a support is formed between the shoulder and the main body of the shaft rod 1, thereby improving the structural strength of the shoulder and avoiding affecting the assembly of the main body of the shaft rod 1 and other structures.

[0057] In some embodiments, the first retaining ring groove 5 may be formed as follows: Figure 3 , Figure 4 and Figure 8 See the structure shown. Figure 3 , Figure 4 and Figure 8 The first retaining ring groove 5 has a rear groove section 510 and a front groove section 520 connected in sequence from the back to the front, and the inner diameter of the rear groove section 510 is defined as D1, and the inner diameter of the front groove section 520 is defined as D2. Figure 8As shown, the inner diameter of the retaining ring 3 in the free state is D3, D1<D3≤D2; the front side wall of the front groove section 520 cooperates with the rear side wall of the second retaining ring groove 6 to clamp the retaining ring 3. During the process of the shaft 1 being inserted into the inner star wheel 210, the retaining ring 3 is in the rear groove section 510 and is in a contracted state; when inserted into the position corresponding to the second retaining ring groove 6, the contraction potential energy of the retaining ring 3 is released, and the retaining ring 3 is stuck in the second retaining ring groove 6; as the abutment degree between the preload expansion sleeve 4 and the inner star wheel 210 gradually increases, the rear side wall of the second retaining ring groove 6 pushes the retaining ring 3 backwards, and the retaining ring 3 enters the front groove section 520. Since D3≤D2, the retaining ring 3 cannot shrink in the front groove section 520; as the retaining ring 3 continues to move forward in the front groove section 520, the retaining ring 3 is finally The front side wall of the front groove section 520 is abutted, and the position of the retaining ring 3 in the front and rear directions is restricted. Since the contraction of the retaining ring 3 is restricted by the inner circumferential wall of the front groove section 520, and the forward movement is restricted by the front side wall of the front groove section 520, even under the action of a larger tensioning force, the rear side wall of the second retaining ring groove 6 cannot push the retaining ring 3 to continue to move forward and escape from the front groove section 520, that is, the position of the inner star wheel 210 and the shaft rod 1 is locked, which not only avoids axial movement, but also has an anti-slip effect, thereby ensuring the reliability of the assembly of the inner star wheel 210 and the shaft rod 1 and the stability of the connection.

[0058] In some specific embodiments, in order to make the front side wall of the front groove section 520 play an effective role in limiting the retaining ring 3, see Figure 3 and Figure 4 The front side wall of the front groove section 520 is perpendicular to the central axis of the shaft rod 1. In other specific embodiments, the front side wall of the front groove section 520 can also be configured as a wall surface that gradually tilts backward from the inside to the outside.

[0059] The design purpose of the above two embodiments is to prevent the front side wall of the front groove section 520 from gradually tilting forward from the inside to the outside. If it tilts forward, when the rear side wall of the second retaining ring groove 6 squeezes the retaining ring 3 backward, the retaining ring 3 may escape from the front groove section 520 along the tilted guide of the front side wall of the front groove section 520.

[0060] In some other specific embodiments, in order to enhance the limiting effect of the front side wall of the front groove section 520 on the retaining ring 3, see Figure 4 The width of the cross section of the retaining ring 3 in its radial direction is defined as L, and the depth of the front groove section 520 is defined as H1, H1≥L / 2. It should be noted that the depth of the rear groove section 510 is defined as H2, H2<L, to ensure that the retaining ring 3 can be effectively engaged with the second retaining ring groove 6.

[0061] In some specific embodiments of the distribution of the rear slot segment 510 and the front slot segment 520, see Figure 4The width of the rear groove section 510 is greater than the width of the front groove section 520, thereby compressing the size of the first retaining ring groove 5 in the front-to-back direction as much as possible while meeting the assembly and limiting requirements.

[0062] More specifically, in order to better adapt to the insertion process of the shaft 1, the width of the rear groove section 510 is greater than the thickness of the retaining ring 3 in the front-to-back direction; in order to compress the size of the first retaining ring groove 5 in the axial direction of the shaft 1, the width of the front groove section 520 is less than the thickness of the retaining ring 3 in the front-to-back direction. In this embodiment, the cross section of the retaining ring 3 is exemplarily shown as a circle, and in this case, the thickness of the retaining ring 3 in the front-to-back direction is the wire diameter of the retaining ring 3.

[0063] Based on the above embodiments, see Figure 4 , in the direction toward the central axis of the inner star wheel 210, the rear side wall of the second retaining ring groove 6 gradually tilts forward. By reasonably setting the width of the front groove section 520, after the limiting effect of the rear side wall of the second retaining ring groove 6 is cancelled, the retaining ring 3 re-enters the rear groove section 510 under the action of gravity and its own contraction tendency. When disassembling, first push the shaft rod 1 forward with force to make the retaining ring 3 fall into the rear groove section 510; then pull the shaft rod 1 backward, the retaining ring 3 is squeezed by the rear side wall of the second retaining ring groove 6, shrinks in the rear groove section 510, and finally escapes from the second retaining ring groove 6, at which time the shaft rod 1 can be pulled out to achieve disassembly. In specific implementation, the width of the front groove section 520 is defined as A, and the thickness of the retaining ring 3 in the front-to-back direction is defined as B, and A≤B / 2.

[0064] In some embodiments, see Figure 3 and Figure 4 The front edge of the outer peripheral wall of the second retaining ring groove 6 is flush with the front end surface of the inner star wheel 210, so that the second retaining ring groove 6 is a retaining ring groove open forward. While meeting the assembly and limiting requirements, the forward movement of the positions of the first retaining ring groove 5 and the second retaining ring groove 6 is achieved, and then the front end of the inner star wheel 210 is limited by the retaining ring 3, and the rear end is limited by the pre-tightening sleeve 4, so that the force on the inner star wheel 210 and the shaft rod 1 is more uniform.

[0065] In some embodiments, see Figure 3 and Figure 4 Since the rear groove section 510 cooperates with the front groove section 520, the cross section of the first retaining ring groove 5 is stepped. In order to facilitate the retaining ring 3 to cross the step and enter the front groove section 520 from the rear groove section 510, it is preferable to use a retaining ring 3 with a circular or elliptical cross section in a free state. This embodiment exemplarily shows a retaining ring 3 with a circular cross section.

[0066] Based on the same inventive concept, an embodiment of the present application also provides a vehicle, comprising the above-mentioned fixed joint assembly.

[0067] Compared with the prior art, the vehicle provided in this embodiment effectively avoids the problem of axial movement between the shaft rod 1 and the inner star wheel 210 by adopting the above-mentioned fixed joint assembly, improves the stability and reliability of the use of the drive shaft, and further improves the smoothness of the driving process and the driving experience.

[0068] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A fixed joint assembly, characterized in that: include: A shaft (1), a fixed joint body (2), a retaining ring (3) and a pre-tightening sleeve (4); The shaft (1) is plugged into the inner star wheel (210) in the fixed joint body (2) in a front-to-back manner; the shaft (1) is provided with a first retaining ring groove (5); the inner star wheel (210) is provided with a second retaining ring groove (6); the retaining ring (3) is respectively inserted into the first retaining ring groove (5) and the second retaining ring groove (6); The pre-tightening sleeve (4) is sleeved on the outer circumference of the shaft (1), and the rear side is in contact with the shaft (1), and the front side of the pre-tightening sleeve (4) is in contact with the inner star wheel (210), so that the front side wall of the first retaining ring groove (5) and the rear side wall of the second retaining ring groove (6) cooperate to clamp the retaining ring (3).

2. The fixed joint assembly according to claim 1, characterized in that: A avoidance groove (7) is formed on the rear side of the inner star wheel (210), and the avoidance groove (7) has a second pre-tightening inclined surface (710); the pre-tightening expansion sleeve (4) has a first pre-tightening inclined surface (410) arranged forward, and the first pre-tightening inclined surface (410) is arranged at an angle with the central axis of the shaft (1), and the first pre-tightening inclined surface (410) and the second pre-tightening inclined surface (710) are correspondingly fitted.

3. The fixed joint assembly according to claim 2, characterized in that: The first pre-tightening inclined surface (410) is arranged on the outer periphery of the pre-tightening expansion sleeve (4), the distance between the first pre-tightening inclined surface (410) and the shaft rod (1) gradually increases from front to back, the outer side wall of the avoidance groove (7) is the second pre-tightening inclined surface (710), and the distance between the second pre-tightening inclined surface (710) and the central axis of the inner star wheel (210) gradually increases from front to back; or The first pre-tightening bevel (410) is arranged on the inner circumference of the pre-tightening sleeve (4), and the distance between the first pre-tightening bevel (410) and the shaft rod (1) gradually decreases from front to back. The inner side wall of the avoidance groove (7) is the second pre-tightening bevel (710), and the distance between the second pre-tightening bevel (710) and the central axis of the inner star wheel (210) gradually decreases from front to back.

4. The fixed joint assembly according to claim 2, characterized in that: The first pre-tightening inclined surface (410) is a conical surface continuously distributed along the circumference of the pre-tightening expansion sleeve (4), and the second pre-tightening inclined surface (710) is a conical surface continuously distributed along the circumference of the inner star wheel (210).

5. The fixed joint assembly according to claim 1, characterized in that: The shaft rod (1) is provided with a limiting shoulder (110), the limiting shoulder (110) abuts against the rear side of the pre-tightening sleeve (4), and a transition slope (120) is provided between the limiting shoulder (110) and the main body of the shaft rod (1), and the transition slope (120) gradually shrinks from front to back.

6. The fixed joint assembly according to claim 1, characterized in that: The first retaining ring groove (5) comprises a rear groove section (510) and a front groove section (520) connected in sequence from the back to the front, the inner diameter of the rear groove section (510) is defined as D1, the inner diameter of the front groove section (520) is defined as D2, the inner diameter of the retaining ring (3) in a free state is D3, and D1<D3≤D2; The front side wall of the front groove section (520) cooperates with the rear side wall of the second retaining ring groove (6) to clamp the retaining ring (3).

7. The fixed joint assembly according to claim 6, characterized in that: The width of the rear groove section (510) is greater than the width of the front groove section (520).

8. The fixed joint assembly according to claim 7, characterized in that: In the direction toward the central axis of the inner star wheel (210), the rear side wall of the second retaining ring groove (6) gradually inclines forward.

9. The fixed joint assembly according to claim 6 or 7, characterized in that: The front edge of the outer peripheral wall of the second retaining ring groove (6) is flush with the front end surface of the inner star wheel (210).

10. A vehicle, characterized in that: Comprising a fixed joint assembly as described in any one of claims 1-9.

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