阅读说明：本技术 转臂节点的预压缩量调节方法 (Pre-compression amount adjusting method for rotating arm node ) 是由 蒋仲三 冯万盛 韩庆利 曾先会 罗俊 陈俊辉 张玉祥 张志强 于 2021-09-30 设计创作，主要内容包括：本发明属于轨道车辆减振部件制造领域,公开了转臂节点的预压缩量调节方法,转臂节点包括芯轴、橡胶体和外套,橡胶体硫化在芯轴和外套之间,将外套设为两节,在两节外套之间设置对装间隙实现转臂节点的预压缩,通过调节对装间隙的宽度来调节转臂节点的预压缩量,以此根据转臂节点的特定应用工况调节转臂节点在径向和轴向上的刚度性能,调节其径向和轴向的刚度比。(The invention belongs to the field of manufacturing of vibration reduction parts of railway vehicles and discloses a precompression amount adjusting method of a rotating arm node, wherein the rotating arm node comprises a mandrel, a rubber body and an outer sleeve, the rubber body is vulcanized between the mandrel and the outer sleeve, the outer sleeve is divided into two sections, a butt-assembling gap is arranged between the two sections of the outer sleeve to realize precompression of the rotating arm node, and the precompression amount of the rotating arm node is adjusted by adjusting the width of the butt-assembling gap, so that the rigidity performance of the rotating arm node in the radial direction and the axial direction is adjusted according to the specific application working condition of the rotating arm node, and the rigidity ratio of the rotating arm node in the radial direction and the axial direction is adjusted.)

1. The precompression amount adjusting method of the rotating arm node comprises a mandrel (1), a rubber body (2) and an outer sleeve, wherein the rubber body (2) is vulcanized between the mandrel (1) and the outer sleeve, and is characterized in that the outer sleeve is provided with two sections, a fitting gap (3) is arranged between the two sections of the outer sleeve to realize precompression of the rotating arm node, the precompression amount of the rotating arm node is adjusted by adjusting the width D1 of the fitting gap (3), so that the rigidity performance of the rotating arm node in the radial direction and the axial direction is adjusted according to the specific application working condition of the rotating arm node, and the rigidity ratio of the rotating arm node in the radial direction and the axial direction is adjusted.

2. The method for adjusting the precompression amount of a boom node according to claim 1, wherein the fitting gap (3) is formed by a first jacket fitting surface (6) and a second jacket fitting surface (7) between the two jackets, and the adjustment of the precompression amount of the boom node is performed by adjusting the distance between the first jacket fitting surface (6) and the second jacket fitting surface (7), i.e., by adjusting the width D1 of the fitting gap (3) formed by the first jacket fitting surface (6) and the second jacket fitting surface (7).

3. The pre-compression amount adjustment method of boom node according to claim 2, characterized in that the adjustment method comprises the steps of:

the first step is as follows: measuring the precompression quantity required by the lower arm node under different working conditions according to the radial-axial ratio required by the different working conditions;

the second step is that: determining the required fitting distance S1 according to the calculated precompression amount;

the third step: by adjusting the placing positions of the two outer sleeves or the lengths of the two outer sleeves, the width D1 of an assembling gap (3) formed by the first outer sleeve assembling surface (6) and the second outer sleeve assembling surface (7) is equal to the assembling distance S1 required by the pre-compression amount measured under specific working conditions.

4. The precompression amount adjustment method for a boom node according to claim 1, wherein the fitting gap (3) is formed by an adjusting collar and an inner side surface of the outer casing between the two outer casings, and the adjustment of the precompression amount of the boom node is performed by adjusting a distance between the adjusting collar and the inner side surface of the outer casing, that is, by adjusting a width D1 of the fitting gap (3) formed by the adjusting collar and the inner side surface of the outer casing.

5. The precompression amount adjustment method for a boom node as claimed in claim 4, wherein a first sunken step (13) and a second sunken step (14) are symmetrically provided at the upper portions of the first outer end surface (10) and the second inner end surface (11) of the outer sleeve between the two outer sleeves, respectively, the first sunken step (13) and the second sunken step (14) together form an adjustment step, two pieces of adjustment collars are provided on the adjustment step, 2 symmetrical fitting gaps (3) are formed between the first outer end surface (17) of the adjustment collar on the side of the first sunken step (13) and the first inner side surface (8) of the outer sleeve on the first sunken step (13) and between the second outer end surface (18) of the adjustment collar on the side of the second sunken step (14) and the second inner side surface (9) of the outer sleeve on the second sunken step (14) on the adjustment collar, and by adjusting the width D1 of the fitting gaps (3), to achieve adjustment of the pre-compression amount of the knuckle.

6. The method of claim 5, wherein the width W1 of the adjustment ring is greater than the width D2 between the first (10) and the second (11) inner end surfaces of the outer sleeve, and D2 is greater than or equal to 2D1, so as to ensure that the adjustment ring can be smoothly mounted on the adjustment step, and the first (10) and the second (11) inner end surfaces of the outer sleeve do not interfere with the adjustment of the precompression of the nodes of the rotating arms.

7. The method for adjusting the precompression amount of a boom node according to claim 6, wherein the thickness of the adjustment collar is not greater than the height H1 of the adjustment step to ensure that the adjustment collar does not interfere with the fitting of the boom node into the axle hole of the axle housing.

8. The pre-compression amount adjustment method of boom node as claimed in claim 7, wherein the adjustment method comprises the steps of:

the first step is as follows: measuring the precompression quantity required by the lower arm node under different working conditions according to the radial-axial ratio required by the different working conditions;

the second step is that: determining the required fitting distance S1 according to the calculated precompression amount;

the third step: selecting an adjusting check ring matched with the required fitting distance S1, wherein the relation between the width D1 of a fitting gap (3) formed between the selected adjusting check ring and the inner side surface of the outer sleeve and the fitting distance S1 required by the pre-compression amount calculated according to specific working conditions is as follows: s1=2D 1.

9. Method for adjusting the precompression amount of a boom node according to any of claims 1-8, characterized in that a deformation cavity (19) is provided below the fitting gap (3) in the rubber body (2) to provide a deformation volume space for the rubber body (2) during use, preventing the rubber body (2) from being damaged by stress concentration and increasing the service life of the rubber body (2).

10. The precompression amount adjustment method for a boom node as claimed in claim 9, wherein a first vulcanization surface (20) between the mandrel (1) and the rubber body (2) and a second vulcanization surface (21) between the outer sleeve and the rubber body (2) are both projected toward a side away from the axial center line L1 of the boom node; the profile of the first vulcanization surface (20) between the deformation cavity (19) of the rubber body (2) and the mandrel (1) is a horizontal straight surface (22) parallel to the axial center line L1 of the rotating arm node.

Technical Field

The invention relates to a precompression amount adjusting method of a rotating arm node, which is mainly used in a primary damping system or a secondary damping system of a railway vehicle and belongs to the field of manufacturing of damping parts of the railway vehicle.

Background

The rotating arm node is mainly used in bogies of light rails, subways, common passenger cars and high-speed motor train units, is a class A key part of a train, is assembled in a rotating arm of an axle box positioning system, is used for transferring traction force and transverse force of the bogie, can absorb and attenuate vibration of the vehicle in the vertical direction, the transverse direction and the longitudinal direction, ensures stable running of the vehicle, and plays roles of flexible connection and axle box positioning.

The pivot arm node is usually made by vulcanizing metal and rubber, and transmits the traction force and the braking force of the wheel pair and the framework. Meanwhile, the rotating arm node can also provide transverse and longitudinal rigidity, so that transverse and longitudinal relative displacement between the wheel pair and the framework is realized, the running stability and curve trafficability of the vehicle are ensured, and the suspension component is an important suspension component in the rail vehicle.

Usually, the pivot arm node allows a large vertical displacement of the axle box relative to the frame, and the transverse and longitudinal relative displacements between the wheel sets and the frame are realized by means of the deformation of the pivot arm node, rubber in the pivot arm node can provide different transverse and longitudinal positioning rigidity, and the longitudinal rigidity and the transverse rigidity of the pivot arm node directly determine the longitudinal and transverse displacements of the axle box. In order to prolong the service life of the rotating arm node and prevent the rotating arm node from being damaged by pulling when the rotating arm node is loaded, different precompression amounts need to be designed for the rotating arm node according to different application scenes so as to obtain specific transverse and longitudinal rigidity performances required under specific working conditions.

Disclosure of Invention

The invention aims to provide a precompression amount adjusting method of a boom node, which adjusts precompression amount of the boom node by arranging an outer sleeve into two sections and adjusting the width of a fitting gap formed between the two outer sleeves, thereby adjusting the rigidity performance of the boom node in the radial direction and the axial direction according to the specific application condition of the boom node and adjusting the rigidity ratio of the boom node in the radial direction and the axial direction.

In order to achieve the purpose, the invention provides the following technical scheme: a precompression amount adjustment method for a boom node, the boom node comprising a mandrel, a rubber body and an outer sleeve, the rubber body being vulcanized between the mandrel and the outer sleeve; the outer sleeves are arranged into two sections, the opposite-assembling clearance is arranged between the two outer sleeves, and the precompression quantity of the rotating arm node is adjusted by adjusting the width D1 of the opposite-assembling clearance, so that the rigidity performance of the rotating arm node in the radial direction and the axial direction is adjusted according to the specific application working condition of the rotating arm node, and the rigidity ratio of the radial direction and the axial direction is adjusted.

Preferably, the opposite-mounting gap is formed by a first outer sleeve opposite-mounting surface and a second outer sleeve opposite-mounting surface between two outer sleeves, and the adjustment of the pre-compression amount of the knuckle is realized by adjusting the distance between the first outer sleeve opposite-mounting surface and the second outer sleeve opposite-mounting surface, namely by adjusting the width D1 of the opposite-mounting gap formed by the first outer sleeve opposite-mounting surface and the second outer sleeve opposite-mounting surface.

Preferably, the adjustment method comprises the following steps:

the first step is as follows: measuring the precompression quantity required by the lower arm node under different working conditions according to the radial-axial ratio required by the different working conditions;

the second step is that: determining the required fitting distance S1 according to the calculated precompression amount;

the third step: the width D1 of the fitting clearance formed by the first outer sleeve fitting surface and the second outer sleeve fitting surface is equal to the fitting distance S1 required by the pre-compression amount measured under specific working conditions by adjusting the placing positions of the two outer sleeves in the die or adjusting the lengths of the two outer sleeves.

Preferably, the alignment gap is formed by the inner side surface of the outer sleeve between the adjusting collar and the two outer sleeves, and the adjustment of the precompression amount of the knuckle point of the swivel arm is realized by adjusting the distance between the adjusting collar and the inner side surface of the outer sleeve, that is, by adjusting the width D1 of the alignment gap formed by the adjusting collar and the inner side surface of the outer sleeve.

Preferably, the upper parts of the inner end face I and the inner end face II of the outer sleeve between the two outer sleeves are respectively provided with a first sunken step and a second sunken step which are symmetrical, the first sunken step and the second sunken step together form an adjusting step, the two-piece adjusting check ring is arranged on the adjusting step, 2 symmetrical assembling gaps are formed between the outer end face I of the adjusting check ring on one side of the first sunken step on the adjusting check ring and the inner side face I of the outer sleeve on the first sunken step, and between the outer end face II of the adjusting check ring on one side of the second sunken step on the adjusting check ring and the inner side face II of the outer sleeve on the second sunken step on the adjusting check ring, and the adjusting of the pre-compression amount of the knuckle is realized by adjusting the width D1 of the assembling gaps.

Preferably, the width W1 of the adjusting check ring is greater than the width D2 between the first outer sleeve inner end face and the second outer sleeve inner end face, and D2 is greater than or equal to 2D1, so that the adjusting check ring can be stably installed on the adjusting step, and the first outer sleeve inner end face and the second outer sleeve inner end face cannot interfere with the adjustment of the pre-compression amount of the rotating arm node.

Preferably, the thickness of adjusting the retaining ring is not less than 3mm and is not more than the height H1 of adjusting the step to guarantee that the adjusting retaining ring can not form the interference and can prevent that the adjusting retaining ring from being broken in the shaft hole of rotor arm node dress axle box.

Preferably, the adjustment method comprises the following steps:

the first step is as follows: measuring the precompression quantity required by the lower arm node under different working conditions according to the radial-axial ratio required by the different working conditions;

the second step is that: determining the required fitting distance S1 according to the calculated precompression amount;

the third step: selecting an adjusting check ring matched with the required fitting distance S1, wherein the relation between the width D1 of a fitting gap formed between the selected adjusting check ring and the inner side surface of the outer sleeve and the fitting distance S1 required by the pre-compression amount measured under specific working conditions is as follows: s1=2D 1.

Preferably, be located to the below in dress clearance at the rubber body and set up the deformation cavity, for the rubber body provides deformation volume space in the use, prevent that the rubber body from damaging because of stress concentration, increase the life of the rubber body.

Preferably, the first vulcanization surface between the mandrel and the rubber body and the second vulcanization surface between the outer sleeve and the rubber body are both protruded towards one side of the axial center line L1 far away from the pivot arm node; the profile of the first vulcanization surface between the rubber body deformation cavity and the mandrel is a horizontal straight surface parallel to the axial center line L1 of the rotating arm node.

The invention has the beneficial effects that:

1. the invention adjusts the precompression quantity of the tumbler joint by arranging the outer sleeves into two sections and adjusting the width of the opposite installation gap formed between the two outer sleeves, thereby adjusting the rigidity performance of the tumbler joint in the radial direction and the axial direction according to the specific application working condition of the tumbler joint and adjusting the rigidity ratio of the tumbler joint in the radial direction and the axial direction. The method specifically comprises the following two modes:

1) adjusting the precompression amount of the rotating arm node by setting the outer sleeve into a two-section type and adjusting the width D1 of an assembling gap between the outer sleeve assembling surface I and the outer sleeve assembling surface II between the two outer sleeves; specifically, the precompression amount required by the boom node under different working conditions can be measured and calculated, the required fitting distance S1 is determined through the precompression amount, and the width D1 of a fitting gap formed between the outer sleeve fitting surface I and the outer sleeve fitting surface II is adjusted, so that D1 is obtained from S1.

2) The precompression amount of the rotating arm node is adjusted by arranging the outer sleeve into a two-section type, arranging an adjusting step formed by a first sunken step and a second sunken step at the upper part of the inner end surface of the outer sleeve of the two-section type outer sleeve, arranging a two-flap type adjusting check ring on the adjusting step, and adjusting the width D1 of an opposite gap between the outer end surface of the adjusting check ring and the inner side surface of the outer sleeve on the adjusting step; specifically, the precompression amount required by the rotating arm node under different working conditions can be measured and calculated, the required assembling distance S1 is determined through the precompression amount, and the width D1 of the assembling gap between the outer end face of the adjusting check ring and the inner side face of the outer sleeve on the adjusting step is adjusted, so that S1=2D 1; to the rocking arm node of different precompression volume demands under the different operating mode, only need change the regulation retaining ring of different width can, need not adjust or change rocking arm node itself, increased the commonality that rocking arm node used, practiced thrift manufacturing cost.

2.1) the rubber body is located two sections overcoat and sets up the deformation cavity to the below department in dress clearance, and accessible deformation cavity provides the deformation volume space for the rubber body in the use, prevents that the rubber body from damaging because of stress concentration, increases the life of the rubber body.

2.2) the axial stiffness of the jib node can be increased by bulging both the first vulcanising surface between the spindle and the rubber body and the second vulcanising surface between the outer sleeve and the rubber body towards the side remote from the axial centre line L1 of the jib node, i.e. towards the outer sleeve. Meanwhile, the molded surface of the vulcanization surface I between the mandrel and the rubber body between the rubber body deformation cavity and the mandrel is set to be a horizontal straight surface parallel to the axial center line L1 of the rotating arm node, so that the fluidity of liquid rubber materials in the vulcanization process can be improved, the rubber body is vulcanized uniformly, and the service performance of the rubber body is ensured.

Drawings

Fig. 1 is a schematic overall structure diagram of a boom node in the first embodiment.

Fig. 2 is a schematic structural diagram of a roll-over state when the swivel arm joint is assembled according to an embodiment.

Fig. 3 is a schematic overall structure diagram of a boom node in the second embodiment.

Fig. 4 is a partially enlarged view of a portion a in fig. 3.

Fig. 5 is a schematic structural diagram of the second embodiment in which the boom nodes are laterally turned during assembly.

The reference numerals include: 1. a mandrel; 2. a rubber body; 3. a butt-mounting gap; 4. a first outer sleeve; 5. a second outer sleeve; 6. the outer sleeve is oppositely arranged to face one; 7. the outer sleeve is oppositely arranged on the surface II; 8. the inner side surface I of the outer sleeve; 9. the inner side surface II of the outer sleeve; 10. the inner end face I of the outer sleeve; 11. a second inner end surface of the outer sleeve; 12. the outer end face of the outer sleeve; 13. a first sinking step; 14. a second sinking step; 15. a first flap adjusting collar; 16. a second flap adjusting retainer ring; 17. the outer end face I of the adjusting retainer ring; 18. adjusting the outer end surface II of the check ring; 19. a deformation cavity; 20. vulcanizing surface I; 21. vulcanizing surface II; 22. a horizontal straight surface; 23. a first end of a mandrel; 24. a second end of the mandrel.

Detailed Description

The invention is described in further detail below with reference to figures 1-5.

Example one

As shown in the attached figures 1 and 2, the precompression quantity adjusting method of the rotating arm node comprises a core shaft 1, a rubber body 2 and an outer sleeve, wherein the rubber body 2 is vulcanized between the core shaft 1 and the outer sleeve, the outer sleeve is provided with two sections, the two sections of the outer sleeve are respectively a first outer sleeve 4 and a second outer sleeve 5, an opposite installation gap 3 is arranged between the first outer sleeve 4 and the second outer sleeve 5, the precompression quantity of the rotating arm node is adjusted by adjusting the width D1 of the opposite installation gap 3, so that the rigidity ratio of the radial direction and the axial direction of the rotating arm node is adjusted according to the specific application working condition of the rotating arm node, and the rigidity performance of the rotating arm node in the radial direction and the axial direction is adjusted.

As shown in fig. 1, the outer sleeve one 4 comprises an outer sleeve opposite mounting surface one 6, the outer sleeve two 5 comprises an outer sleeve opposite mounting surface 7, the opposite mounting gap 3 of the embodiment is formed by the outer sleeve opposite mounting surface one 6 and the outer sleeve opposite mounting surface 7, the distance between the outer sleeve opposite mounting surface one 6 and the outer sleeve opposite mounting surface 7 is the width D1 of the opposite mounting gap 3, and the precompression amount of the tumbler node can be adjusted by adjusting the width D1 of the opposite mounting gap 3 between the outer sleeve opposite mounting surface one 6 and the outer sleeve opposite mounting surface 7.

As shown in fig. 1 and fig. 2, a deformation cavity 19 is disposed below the opposite-installation gap 3 of the rubber body 2, and the width D4 of the deformation cavity 19 is not less than the width D1 of the opposite-installation gap, so as to provide a deformation volume space for the rubber body 2 during use, prevent the rubber body 2 from being damaged due to stress concentration, and prolong the service life of the rubber body 2.

As shown in fig. 1 and 2, the first vulcanization surface 20 between the mandrel 1 and the rubber body 2 and the second vulcanization surface 21 between the outer sleeve and the rubber body 2 are both protruded toward the side away from the axial center line L1 of the boom node, which enhances the axial rigidity of the boom node.

As shown in fig. 1 and 2, the profile of the vulcanization surface one 20 between the mandrel 1 and the rubber body 2 between the deformation cavity 19 and the mandrel 1 is a horizontal straight surface 22 parallel to the axial center line L1 of the swivel arm node. Because be from one end injecting glue during the vulcanization, set up horizontal straight face 22 with a vulcanization face one 20 in the below of 2 deformation cavities 19 of the rubber body for a vulcanization face one 20 becomes horizontal channel in the below of 2 deformation cavities 19 of the rubber body, can improve the mobility of the liquid sizing material of vulcanization in-process, guarantee the homogeneity of 2 vulcanizations of the rubber body, reinforcing 2 performance and the life of the rubber body.

The precompression amount adjustment method of the boom node in the present embodiment includes the steps of:

the first step is as follows: measuring the precompression quantity required by the lower arm node under different working conditions according to the radial-axial ratio required by the different working conditions;

the second step is that: determining the required fitting distance S1 according to the calculated precompression amount;

the third step: the width D1 of the fitting gap 3 formed by the first outer sleeve fitting surface 6 and the second outer sleeve fitting surface 7 is equal to the fitting distance S1 required by the pre-compression amount measured under specific working conditions by adjusting the placing positions of the two outer sleeves in the die or adjusting the lengths of the two outer sleeves.

The assembling steps of the rotating arm node in the embodiment are as follows:

the first step is as follows: vertically placing the pivot arm node so that the first end 23 of the mandrel faces the inner side of the axle hole of the axle box and the second end 24 of the mandrel faces the side far away from the axle hole of the axle box;

the second step is that: and (3) downwards pressing the first end 23 of the mandrel into the shaft hole of the shaft box in an interference fit manner until the second end 24 of the mandrel is pressed into the shaft hole, wherein the first outer sleeve assembling surface 6 and the second outer sleeve assembling surface 7 are assembled and attached to each other in a fit manner, and the rotating arm node is assembled with the shaft hole in an interference fit manner through the outer end surface 12 of the outer sleeve.

Example two

As shown in fig. 3 to 5, the present embodiment differs from the first embodiment in that the fitting gap 3 is formed by the adjusting collar and the inner side surface of the outer jacket between the two outer jackets, and the adjustment of the pre-compression amount of the knuckle is achieved by adjusting the distance between the adjusting collar and the inner side surface of the outer jacket, that is, by adjusting the width D1 of the fitting gap 3 formed by the adjusting collar and the inner side surface of the outer jacket.

As shown in fig. 3 and 4, symmetrical sunken steps I13 and sunken steps II 14 are respectively arranged on the upper portions of the inner end surface I10 and the inner end surface II 11 of the outer sleeve between the two outer sleeves, the sunken steps I13 and the sunken steps II 14 jointly form an adjusting step, the adjusting retainer ring is of a two-petal structure and comprises a first petal adjusting retainer ring 15 and a second petal adjusting retainer ring 16, and the first petal adjusting retainer ring 15 and the second petal adjusting retainer ring 16 are oppositely arranged on the adjusting steps of the outer sleeve I4 and the outer sleeve II 5 and encircle the outer sides of the adjusting steps; the adjusting check ring comprises a first adjusting check ring outer end face 17 and a second adjusting check ring outer end face 18, the first adjusting check ring outer end face 17 is located on a first sunken step 13, the second adjusting check ring outer end face 18 is located on a second sunken step 14, 2 symmetrical opposite assembling gaps 3 are formed between the first adjusting check ring outer end face 17 and a first outer sleeve inner side face 8 on the first sunken step 13, and between the second adjusting check ring outer end face 18 and a second outer sleeve inner side face 9 on the second sunken step 14, and the adjusting of the precompression amount of the knuckle of the rotating arm is realized by adjusting the width D1 of the opposite assembling gaps 3.

As shown in FIG. 4, the width W1 of the adjusting collar is greater than the width D2 between the first outer sleeve inner end surface 10 and the second outer sleeve inner end surface 11, and D2 is greater than or equal to 2D1, so that on one hand, the adjusting collar can be stably mounted on the adjusting step, on the other hand, if D2 is less than 2D1, when the rotating arm node is assembled, the first outer sleeve inner end surface 10 and the second outer sleeve inner end surface 11 are in contact compression when the adjusting collar and the outer sleeve are not compressed, namely the optimal compression amount of the rotating arm node is not reached, and at the moment, the first outer sleeve inner end surface 10 and the second outer sleeve inner end surface 11 interfere with the adjustment of the pre-compression amount of the rotating arm node, so that D2 is set to D2 greater than or equal to 2D 1.

The thickness of the adjusting check ring is not more than the height H1 of the adjusting step. If the thickness of the adjusting check ring is larger than the height H1 of the adjusting step, the adjusting check ring can interfere when the rotating arm node is assembled in the shaft hole of the axle box.

As shown in fig. 3 and 4, the width D4 of the deformation cavity 19 is not less than the distance D3 between the first jacket inner side 8 and the second jacket inner side 9, so as to provide a deformation volume space for the rubber body 2 during use, prevent the rubber body 2 from being damaged due to stress concentration, and prolong the service life of the rubber body 2.

In this scheme, to the rocking arm node of different precompression volume demands under the different operating mode, only need change different width adjust the retaining ring can, need not adjust or change rocking arm node itself, increased the commonality that rocking arm node used, practiced thrift manufacturing cost.

The precompression amount adjustment method of the boom node in the present embodiment includes the steps of:

the first step is as follows: measuring the precompression quantity required by the lower arm node under different working conditions according to the radial-axial ratio required by the different working conditions;

the second step is that: determining the required fitting distance S1 according to the calculated precompression amount;

the third step: selecting an adjusting collar which is matched with the required fitting distance S1, wherein the relation between the width D1 of the fitting gap 3 formed between the selected adjusting collar and the inner side surface of the outer sleeve and the fitting distance S1 required by the pre-compression amount measured under specific working conditions is as follows: s1=2D 1. Wherein, form one between the outer terminal surface one 17 of regulation retaining ring and the overcoat medial surface one 8 on the formula step of sinking 13 and adorn clearance 3 to forming one between the outer terminal surface two 18 of regulation retaining ring and the overcoat medial surface two 9 on the formula step two 14 and adorn clearance 3 to adorning, 2 are to adorning clearance 3 symmetry setting, and 2 are to adorning the distance of clearance 3 and being D1.

The assembling steps of the rotating arm node in the embodiment are as follows:

the first step is as follows: vertically placing the pivot arm node so that the first end 23 of the mandrel faces the inner side of the axle hole of the axle box and the second end 24 of the mandrel faces the side far away from the axle hole of the axle box;

the second step is that: the first end 23 of the mandrel is downwards installed into a shaft hole of the axle box, and the assembly is suspended when the first outer sleeve 4 on the side close to the first end 23 of the mandrel is close to the inner side surface 8 of the outer sleeve on the adjusting step and is close to the shaft hole;

the third step: a first petal adjusting retainer ring 15 and a second petal adjusting retainer ring 16 of a two-petal metal adjusting retainer ring matched with the precompression amount of the rotating arm node are oppositely installed on an adjusting step of the outer sleeve, and a radial central line formed after the first petal adjusting retainer ring 15 and the second petal adjusting retainer ring 16 are oppositely installed is superposed with a radial central line L2 of the rotating arm node;

the fourth step: and continuously downwards installing the oppositely installed first petal adjusting check ring 15 and second petal adjusting check ring 16 and the rotating arm node into the shaft hole until the second end 24 of the mandrel is pressed into the shaft hole, at the moment, the outer side surface I8 of the outer sleeve and the outer end surface I17 of the adjusting check ring, the inner side surface II 9 of the outer sleeve and the outer end surface II 18 of the adjusting check ring are oppositely installed, attached and compressed, and the rotating arm node is assembled with the shaft hole through the outer end surface 12 of the outer sleeve in an interference fit mode.

The above are merely examples of the present invention, and the present invention is not limited to the field related to the embodiments, and the common general knowledge of the known specific structures and characteristics in the schemes is not described herein too much. It should be noted that, for those skilled in the art, without departing from the scope of the present invention, several variations and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.