Steering swing arm assembly applied to disconnected steering trapezoidal mechanism

Abstract

The utility model relates to the field of vehicle steering system part design, in particular to a steering swing arm assembly applied to a disconnected steering trapezoidal mechanism, which comprises a swing arm, a rotary connecting part is arranged at a first end of the swing arm, a swing arm cavity is arranged at the rotary connecting part, and the whole swing arm rotates around the axis of the swing arm cavity. A swing arm cavity is formed in the swing arm, a swing arm shaft is installed in the swing arm cavity, the upper end of the swing arm shaft is installed in a swing arm support, the swing arm shaft and the swing arm are supported through a tapered roller bearing, and the tapered roller bearing and the swing arm shaft are axially positioned and fastened through a fastening assembly. The steering swing arm assembly is compact in structure, the swing arm shaft, the bearing assembly, the sealing assembly, the fastening assembly and the like are all assembled in the swing arm cavity, and the installation space is saved; and on the other hand, compared with an existing steering swing arm device, the steering swing arm assembly is more reasonable in structure, loads such as bending moment acting on a swing arm shaft and a bearing assembly by a swing arm are small, and the lightweight design of the structure is easy to achieve.

Description

Technical Field

[0001] The utility model relates to the field of vehicle steering system component design, in particular to a steering swing arm assembly applied to a disconnected steering trapezoidal mechanism. Background Art

[0002] When the vehicle adopts an independent suspension structure, the steering mechanism needs to adopt a disconnected steering trapezoidal mechanism. The disconnected steering trapezoidal mechanism is mainly composed of a tie rod, left and right steering arms, an intermediate tie rod, and a steering knuckle arm, and each component is connected by a ball joint. The steering arm device not only transmits the steering power but also bears the load caused by the impact of the wheel side. The steering arm assembly device is an important structural component of the steering system.

[0003] In the existing steering swing arm assembly structure, the swing arm and the swing arm shaft device are separate components, which are assembled together to form a steering swing arm assembly device. This structure occupies a large space; at the same time, in order to ensure the structural strength, it is difficult to achieve lightweight design in the existing steering swing arm assembly. On the other hand, the load on the steering swing arm is complex and the working environment is relatively harsh, so the fastening reliability of its rotating connection parts is required to be high. The existing steering swing arm assembly structure has the risk of fastening structure failure.

[0004] The existing patent number is 2019209041354U, which provides a swing arm shaft device in a disconnected steering system. The device is mainly composed of a swing arm shaft, a housing, a bearing assembly, an end cover and a cover. The bearing assembly includes a pair of tapered roller bearings and a middle spacer ring installed back to back. The swing arm shaft of the device is fixed in the housing through the bearing assembly, and the end cover and the cover are fixed to both ends of the housing by bolt connection. A lip seal is provided on the inside of the cover to prevent dust and water. One end of the swing arm shaft of the device is inserted into the tapered hole of the steering swing arm, and the swing arm and the swing arm shaft are locked by a locking nut.

[0005] The swing arm shaft device still has the following disadvantages: the swing arm shaft device and the swing arm are large in size in the direction of the rotation axis, occupying a large space, the swing arm shaft and the housing are subject to a large load, and it is not easy to achieve a lightweight design. The swing arm and the swing arm shaft device are matched through a tapered hole and locked with a nut. When the swing arm is subjected to a large impact load, the locking nut between the swing arm and the swing arm shaft is at risk of loosening, thereby affecting the reliability of the swing arm shaft device. Utility Model Content

[0006] In view of the problems existing in the prior art, the utility model provides a steering swing arm shaft assembly applied to a disconnected steering trapezoidal mechanism, which solves the problems of large occupied space and insufficient reliability of the prior steering swing arm assembly device.

[0007] The technical solution adopted by the utility model to solve its technical problems is: a steering swing arm assembly applied to a disconnected steering trapezoidal mechanism, comprising a swing arm, a first end of the swing arm is provided with a rotating connection portion, a swing arm cavity is provided at the rotating connection portion, the swing arm as a whole rotates around the axis of the swing arm cavity, a swing arm shaft is installed in the swing arm cavity, the upper end of the swing arm shaft is installed in a swing arm support, a tapered roller bearing is used to support the swing arm shaft and the tapered roller bearing and the swing arm shaft are axially positioned and fastened by a fastening assembly.

[0008] Preferably, the number of the tapered roller bearings is two, the two tapered roller bearings are installed in opposite directions, a bearing spacer is installed between the two tapered roller bearings, and the bearing spacer is fitted with the end faces of the two tapered roller bearings.

[0009] Preferably, the fastening assembly is provided with a fastening washer and a nut, the internal threads of the fastening washer and the nut rotate in opposite directions, and one end of the swing arm shaft is provided with a Tang thread, so that the fastening washer and the nut are screwed into one end of the swing arm shaft.

[0010] Preferably, the end of one end of the swing arm cavity is sealed with a lip-shaped sealing ring, an oil seal shield is installed on the outside of the lip-shaped sealing ring, the oil seal shield is installed between the swing arm shaft and the swing arm cavity, and the other end of the swing arm cavity is sealed with an end cover.

[0011] Preferably, the nut is provided with a skirt, and the end of one end of the swing arm shaft is provided with symmetrically distributed grooves, and after the nut is tightened, the skirt of the nut is riveted into the groove.

[0012] Preferably, a grease filling hole is provided on the outer wall of the swing arm cavity, the grease filling hole is located between the lip seal ring and the tapered roller bearing, and a grease nipple is installed on the grease filling hole.

[0013] Preferably, the second end of the swing arm and the middle of the swing arm are provided with tapered holes, which are used to install the wheel side tie rod and the intermediate tie rod respectively.

[0014] The utility model has the following beneficial effects:

[0015] 1) The steering swing arm assembly has a compact structure. The swing arm shaft, bearing assembly, sealing assembly, fastening assembly, etc. are all assembled in the swing arm cavity, saving installation space. On the other hand, the steering swing arm assembly has a more reasonable structure than the existing steering swing arm device. The bending moment and other loads of the swing arm on the swing arm shaft, bearing assembly, etc. are small, making it easy to achieve a lightweight design of the structure.

[0016] 2) The steering swing arm assembly has high structural reliability. The fastening scheme adopted by the steering swing arm assembly has dual anti-loosening measures, namely, Tang's thread anti-loosening and nut and swing arm shaft riveted anti-loosening, and the connection anti-loosening effect is good; the sealing structure adopted is a lip seal at one end and a thread seal at the other end, and the sealing structure is simple and effective; the sealing and fastening structure of the steering swing arm assembly is reasonable and effective, which can adapt to relatively harsh environments and working conditions, and improve the reliability of the steering swing arm assembly;

[0017] 3) The steering swing arm assembly has a low rotational resistance torque after assembly. A pair of tapered roller bearings are used to support the swing arm shaft and the swing arm. The axial clearance of the bearing is effectively guaranteed by the bearing spacer and the shoulder size in the swing arm cavity. There is no need for repeated adjustment, thereby achieving a low rotational resistance torque after assembly and reducing the resistance of the steering transmission mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the steering arm assembly.

[0019] Figure 2 It is a schematic diagram of the appearance structure of the steering arm assembly.

[0020] In the figure: 1-swing arm support; 2-swing arm shaft; 3-oil seal cover; 4-lip seal ring; 5-tapered roller bearing; 6-swing arm; 7-bearing spacer; 8-fastening washer; 9-nut; 10-end cover; 11-grease nipple. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely further describe the technical solutions in the embodiments of the utility model. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] like Figure 1-2 As shown, a steering swing arm assembly applied to a disconnected steering trapezoidal mechanism includes a swing arm support 1, a swing arm shaft 2, an oil seal shield 3, a lip seal ring 4, a tapered roller bearing 5, a swing arm 6, a bearing spacer 7, a fastening washer 8, a nut 9, an end cover 10 and a grease nipple 11.

[0023] Tapered holes are processed at one end and the middle position of the second end of the swing arm 6, and the tapered holes are used to install the wheel-side transverse tie rod and the middle tie rod; the first end of the swing arm 6 is a rotating connection part, and a cavity is processed at the rotating connection part of the swing arm 6. The swing arm 6 as a whole can rotate around the axis of the cavity. The rotating connection part of the swing arm 6 has a cylindrical cavity, and multiple shoulders are processed inside the cavity to facilitate assembly and positioning of the bearing assembly. One end of the cavity of the swing arm 6 has an internal thread, and the end cover 10 and the swing arm cavity can be fixed and sealed through a threaded connection.

[0024] The upper end of the swing arm shaft 2 is installed in the swing arm support 1, and the swing arm shaft 2 and the swing arm support 1 are assembled by interference fit. The left shoulder of the swing arm shaft 2 has the function of axial positioning, which can limit the axial displacement of the swing arm 6; the other part of the swing arm shaft 2 is assembled in the swing arm cavity, and the swing arm shaft 2 and the swing arm cavity are supported by bearings 5, and the bearings 5 ​​and the swing arm shaft 2 are axially positioned and fastened by fastening components.

[0025] The bearing assembly includes two tapered roller bearings 5 ​​and a bearing spacer 7. The two tapered roller bearings 5 ​​are installed in reverse, and the inner ring of the tapered roller bearing 5 is installed on the swing arm shaft 2; the outer rings of the two tapered roller bearings 5 ​​are respectively pressed into the swing arm cavity, and the end faces of the outer rings of the tapered roller bearings 5 ​​are aligned with the shoulders in the swing arm cavity; the bearing spacer 7 is located between the two tapered roller bearings 5, and the end faces of the bearing spacer 7 are respectively in contact with the end faces of the inner rings of the tapered roller bearings 5 ​​on both sides, and the diameter of the bearing spacer 7 is slightly larger than the diameter of the inner ring of the tapered roller bearing. The axial clearance of the two tapered roller bearings 5 ​​after assembly can be guaranteed by the size of the bearing spacer 7 and the size of the shoulder inside the swing arm 6 cavity, without repeated adjustment, so that it is easy to realize the flexible rotation of the swing arm shaft 2 after assembly.

[0026] The fastening assembly includes a fastening washer 8 and a nut 9. The internal threads of the fastening washer 8 and the nut 9 are in opposite directions. The nut 9 has a skirt. One end of the swing arm shaft 2 has a Tang thread, and the end of the Tang thread has a symmetrically distributed groove. The fastening washer 8 and the nut 9 are screwed into one end of the swing arm shaft 2. The end face of the fastening washer 8 is pressed against the inner ring of the upper tapered roller bearing 5, and the nut 9 is pressed against the end face of the fastening washer 8. After the nut 9 is fastened, the skirt of the nut 9 needs to be riveted into the groove at the end of the thread of the swing arm shaft 2. Since the threads of the nut 9 and the fastening washer 8 are in opposite directions, when the fastening washer 8 has a tendency to rotate and loosen under an impact load, the nut 9 will be further tightened by this tendency of the fastening washer 8. Therefore, the fastening assembly composed of the fastening washer 8 and the nut 9 has a good anti-loosening effect and is reliable in fastening. The fastening structure composed of the fastening washer 8 and the nut 9 has a double anti-loosening measure, which improves the reliability of the steering swing arm assembly device.

[0027] The two ends of the cavity of the swing arm 6 are sealed by sealing components. Figure 2The upper end of the swing arm 6 cavity is sealed with a lip seal 4, which is a double-lip type. The upper sealing lip has a dustproof function, and the other side sealing lip has a grease sealing function. An oil seal shield 3 is also installed on the outside of the lip seal 4. The oil seal shield 3 is installed between the swing arm shaft 2 and the swing arm 6 cavity. One end of the oil seal shield 3 is close to the shaft shoulder of the swing arm shaft 2, which can prevent larger particles of sand or debris from entering the swing arm cavity and avoid damaging the lip seal 4, thereby ensuring the effectiveness of the steering swing arm assembly in a harsh working environment. The lower end of the swing arm 6 cavity is sealed with an end cover 10, and the end cover and the swing arm cavity are connected by threads, and the threaded connection also has a sealing function.

[0028] As attached Figure 2 As shown, the cavity of the swing arm 6 is also provided with a grease nipple 11, and the grease nipple 11 is located between the lip seal 4 and the tapered roller bearing 5. Grease can be added to the cavity of the swing arm 6 through the grease 11, thereby improving the maintainability of the steering swing arm assembly.

[0029] The swing arm support 1 is a casting and forging, and is provided with reinforcing ribs on the side to ensure its structural strength. The swing arm support 1 is provided with bolt holes, and can be connected with other components of the vehicle chassis by bolts.

[0030] The steering swing arm assembly has a compact structure and flexible rotation, and the adopted sealing structure and fastening structure have high reliability, thereby improving the working reliability and service life of the swing arm device.

[0031] The present utility model is not limited to the above-mentioned implementation modes, and anyone should be aware of the structural changes made under the inspiration of the present utility model. Any technical solutions that are the same or similar to the present utility model fall within the protection scope of the present utility model.

[0032] The technology, shape and structure parts not described in detail in the present invention are all known technologies.

Claims

1. A steering swing arm assembly applied to a disconnected steering trapezoidal mechanism, characterized in that: It includes a swing arm, a first end of which is provided with a rotating connection part, a swing arm cavity is provided at the rotating connection part, the swing arm as a whole rotates around the axis of the swing arm cavity, a swing arm shaft is installed in the swing arm cavity, the upper end of the swing arm shaft is installed in a swing arm support, a tapered roller bearing is used to support the swing arm shaft and the tapered roller bearing and the swing arm shaft are axially positioned and fastened by a fastening assembly.

2. The steering swing arm assembly applied to the disconnectable steering trapezoidal mechanism according to claim 1, characterized in that: The number of the tapered roller bearings is two, the two tapered roller bearings are installed in opposite directions, a bearing spacer is installed between the two tapered roller bearings, and the bearing spacer fits the end faces of the two tapered roller bearings.

3. The steering swing arm assembly applied to the disconnectable steering trapezoidal mechanism according to claim 1, characterized in that: The fastening assembly is provided with a fastening washer and a nut, the internal threads of the fastening washer and the nut rotate in opposite directions, and one end of the swing arm shaft is provided with a Tang thread, so that the fastening washer and the nut are screwed into one end of the swing arm shaft.

4. The steering swing arm assembly applied to the disconnectable steering trapezoidal mechanism according to claim 1, characterized in that: The end of one end of the swing arm cavity is sealed with a lip seal ring, an oil seal shield is installed on the outside of the lip seal ring, the oil seal shield is installed between the swing arm shaft and the swing arm cavity, and the other end of the swing arm cavity is sealed with an end cover.

5. The steering swing arm assembly applied to the disconnectable steering trapezoidal mechanism according to claim 3, characterized in that: The nut is provided with a skirt, and the end of one end of the swing arm shaft is provided with symmetrically distributed grooves. After the nut is tightened, the skirt of the nut is riveted into the groove.

6. The steering swing arm assembly applied to the disconnectable steering trapezoidal mechanism according to claim 1, characterized in that: A lubricating grease filling hole is arranged on the outer wall of the swing arm cavity, the lubricating grease filling hole is located between the lip seal ring and the tapered roller bearing, and a grease nipple is arranged on the lubricating grease filling hole.

7. The steering swing arm assembly applied to the disconnectable steering trapezoidal mechanism according to claim 1, characterized in that: The second end of the swing arm and the middle of the swing arm are both provided with tapered holes, which are used to install the wheel side tie rod and the middle tie rod respectively.

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