CN217463007U

CN217463007U - Steel plate spring assembly

Info

Publication number: CN217463007U
Application number: CN202123024693.2U
Authority: CN
Inventors: 梁石梅; 周磊; 陈金映
Original assignee: SAIC GM Wuling Automobile Co Ltd
Current assignee: SAIC GM Wuling Automobile Co Ltd
Priority date: 2021-12-03
Filing date: 2021-12-03
Publication date: 2022-09-20
Anticipated expiration: 2031-12-03

Abstract

The utility model provides a leaf spring assembly. The steel plate spring assembly comprises a main spring set, an auxiliary spring set and a central bolt, wherein the main spring set comprises a first main spring leaf, a front bushing and two rear bushings, the front end of the first main spring leaf is coiled to form a front rolling lug, the rear end of the first main spring leaf is coiled to form a rear rolling lug, the front bushing is arranged in the front rolling lug and is in interference fit with the front rolling lug, the two rear bushings are symmetrically arranged in the rear rolling lug by using the central axis of the first main spring leaf, and the rear bushings are in interference fit with the rear rolling lug; the auxiliary spring group is arranged above the first main spring leaf; the central bolt is used for fixing the main spring group and the auxiliary spring group. The front rolling lug of the first main reed of the main spring group of the steel plate spring assembly is connected with the front bracket of the frame through the front bushing, and the rear rolling lug is connected with the rear lifting lug through the two rear bushings, so that the parts and the assembly procedures are reduced, and the production takt is improved.

Description

Steel plate spring assembly

Technical Field

The utility model relates to an automobile parts technical field, in particular to leaf spring assembly.

Background

The steel plate spring is an important bearing part in the automobile, connects the axle and the frame, is used for transmitting force and moment between the frame and the axle, relieves impact and vibration caused by uneven road surfaces, and plays a role in guiding and buffering.

The main reed of prior art's leaf spring assembly cooperates with the bush of pure rubber material, through front bezel pin, back lug pin, lug plate and nut and connected to the frame, has following problem: the number of parts is large, the degree of partial assembly is poor, and the production beat is slow; the pure rubber lining has poor bearing capacity; the matching precision of the bush, the frame, the front plate pin, the rear lifting lug pin, the lifting lug plate and the lug rolling hole is poor, and abnormal sound is easily generated due to mutual friction in the movement process; the front plate pin and the lifting lug pin have poor manufacturing precision, low material strength and easy attenuation of torque.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a leaf spring assembly, this leaf spring assembly include main spring group, vice spring group and central bolt, and the preceding eye of the first main reed through main spring group passes through preceding bush and is connected with the frame fore-stock, and the back eye is connected with back lug through two back bushes, has reduced part and assembly process, has improved the production beat.

For realizing the purpose of the utility model, the utility model adopts the following technical scheme:

according to an aspect of the present invention, there is provided a leaf spring assembly, comprising a main spring set, an auxiliary spring set and a central bolt, wherein the main spring set comprises a first main reed, a front bushing and two rear bushings, the front end of the first main reed is rolled to form a front rolling lug, the rear end is rolled to form a rear rolling lug, the front bushing is disposed in the front rolling lug and is in interference fit with the front rolling lug, the two rear bushings are symmetrically disposed in the rear rolling lug with the central axis of the first main reed, and the rear bushing is in interference fit with the rear rolling lug; the auxiliary spring group is arranged above the first main spring leaf; the central bolt is used for fixing the main spring group and the auxiliary spring group.

According to the utility model discloses an embodiment, wherein, preceding bush includes first exoskeleton, first inner frame and the first rubber body, first exoskeleton with preceding book ear closely laminates, the first rubber body set up in first exoskeleton with between the first inner frame.

According to the utility model discloses an embodiment, wherein, the first outer end of first exoskeleton one side extends to the periphery has first turn-ups, first turn-ups with the side end face of preceding spring eye closely laminates.

According to the utility model discloses an embodiment, wherein, the first inner terminal surface that first inner frame is close to first outer terminal surface one side is provided with first flank of tooth to increase the coefficient of friction of front bushing.

According to the utility model discloses an embodiment, wherein, back bush includes second exoskeleton, the second inner frame and the second rubber body, the second exoskeleton with the back book ear closely laminates, the second rubber body set up in the second exoskeleton with between the second inner frame.

According to the utility model discloses an embodiment, wherein, the second outer end of second exoskeleton one side extends towards the periphery has the second turn-ups, the second turn-ups with the side end face of back book ear closely laminates.

According to the utility model discloses an embodiment, wherein, the second inner frame is close to the second inner end face of second terminal surface one side is provided with the second flank of tooth to increase the coefficient of friction of back bush.

According to the utility model discloses an embodiment, wherein, main reed group still including from top to bottom superpose in proper order in second main reed, third main reed, fourth main reed and the fifth main reed of first main reed below, first main reed the second main reed the third main reed the fourth main reed with the fifth main reed passes through the central bolt rigid coupling, first main reed the second main reed with the third main reed passes through first clamp rigid coupling.

According to the utility model discloses an embodiment, wherein, vice spring group is including the vice reed of first vice reed and the vice reed of second that from top to bottom superposes in proper order, first vice reed with the vice reed of second passes through second clamp rigid coupling.

And a cushion block is clamped between the auxiliary spring group and the first main spring piece, and the central bolt sequentially penetrates through the auxiliary spring group, the cushion block and the main spring group and then is fixed with a nut in a threaded manner.

The utility model provides an embodiment has following advantage or beneficial effect:

the utility model discloses a leaf spring assembly includes main spring group, vice spring group and central bolt, the front eye of the first main reed through main spring group passes through the front bush to be connected with the frame fore-stock, the back eye passes through two back bushes to be connected with the back lug, central bolt connection main spring group and vice spring group, connect the rear axle assembly in central bolt department and constitute the rear suspension assembly, reduced part and assembly process, improved the production beat; the front bushing and the rear bushing are both bushings with flanges on one side, so that abnormal sound caused by interference between the frame and the first main reed when a large lateral force is applied to the frame is avoided; the first internal framework end of the front bushing is provided with a first tooth surface, the second internal framework end of the rear bushing is provided with a second tooth surface, the friction coefficient of the junction surface of the front bushing and the rear bushing is improved, meanwhile, the front plate pin, the rear lug pin and the lug plate are replaced by the standard fastener, the part manufacturing precision is improved, and therefore the minimum anti-sliding safety coefficient of a connection point is improved, and the torque attenuation is prevented.

Drawings

The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

FIG. 1 is a partially exploded view of a leaf spring assembly according to an exemplary embodiment.

FIG. 2 is an elevation view of a front bushing of a leaf spring assembly according to an exemplary embodiment.

FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2, shown in accordance with an exemplary embodiment.

FIG. 4 is an elevation view of a rear bushing of a leaf spring assembly according to an exemplary embodiment.

FIG. 5 is a cross-sectional view taken along line B-B of FIG. 4, shown in accordance with an exemplary embodiment.

FIG. 6 is a lap joint view of a leaf spring assembly and rear axle assembly shown in accordance with an exemplary embodiment.

Wherein the reference numerals are as follows:

1. a main spring group; 11. a first main reed; 111. a front eye is curled; 112. rolling the ears; 12. a front bushing; 121. a first exoskeleton; 1211. a first flanging; 122. a first inner skeleton; 1221. a first tooth surface; 123. a first rubber body; 13. a rear bushing; 131. a second exoskeleton; 1311. second flanging; 132. A second inner skeleton; 133. a second rubber body; 14. a second main reed; 15. a third main reed; 16. A fourth main reed; 17. a fifth main reed; 18. a first clip; 2. an auxiliary spring group; 21. a first secondary reed; 22. a second secondary reed; 23. a second clip; 3. a center bolt; 4. cushion blocks; 5. a rear lifting lug; 6. and a rear axle assembly.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted.

The terms "a," "an," "the," "said" are used to indicate the presence of one or more elements/components/etc.; the terms "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc.

As shown in fig. 1 to 5, fig. 1 is a partially exploded view of a leaf spring assembly provided by the present invention. Fig. 2 shows a front view of the front bushing 12 of a leaf spring assembly according to the present invention. Fig. 3 shows a cross-sectional view along line a-a of fig. 2 provided by the present invention. Fig. 4 shows a front view of rear bushing 13 of a leaf spring assembly according to the present invention. Fig. 5 shows a cross-sectional view taken along line B-B of fig. 4 provided by the present invention. Fig. 6 shows a lap joint diagram of the leaf spring assembly and the rear axle assembly 6 provided by the present invention.

The utility model discloses leaf spring assembly includes main spring group 1, vice spring group 2 and central bolt 3, main spring group 1 includes first main reed 11, preceding bush 12 and two back bushes 13, the front end of first main reed 11 is rolled up and is formed preceding eye 111, and the rear end is rolled up and is formed back eye 112, preceding bush 12 set up in preceding eye 111 and with preceding eye 111 interference fit, two back bushes 13 with the central axis symmetry of first main reed 11 sets up in back eye 112, back bush 13 with back eye 112 interference fit; the auxiliary spring group 2 is arranged above the first main reed 11; the central bolt 3 is used for fixing the main spring group 1 and the auxiliary spring group 2.

The auxiliary spring group 2 is arranged above the main spring group 1, mounting holes are respectively formed in the centers of the auxiliary spring group 2 and the main spring group 1, a central bolt 3 sequentially penetrates through the auxiliary spring group 2 and the main spring group 1 from top to bottom, a nut is in threaded connection with the central bolt 3 at the bottom of the main spring group 1, the main spring group 1 and the auxiliary spring group 2 are further fixed, a front rolling lug 111 is formed at the front end of a first main spring leaf 11 of the main spring group 1 in a rolling mode, the front rolling lug 111 is in interference fit with the front rolling lug 111 through a front bushing 12, and when a steel plate spring assembly and a front frame of a frame are assembled, the problem that the front rolling lug 111 and surrounding environment parts such as a front frame and bolts have abnormal sound is solved under the conditions of pressure output and torsion angles. Two back bushes 13 get into from the both sides of back eye 112 respectively, and with back eye 112 interference fit, because back eye 112 passes through back lug 5 and connects in the frame after-poppet, the left and right sides of back lug 5 all has overlap portion with back eye 112, set up two back bushes 13 with the center pin symmetry of first main reed 11, the position that just sets up behind lug 5 and back eye 112 and probably takes place to collide with, solve back eye 112 and all peripheral environment spare like the abnormal sound problem of back lug 5 and bolt etc..

In a preferred embodiment of the present invention, the front bushing 12 includes a first outer frame 121, a first inner frame 122 and a first rubber body 123, the first outer frame 121 is closely attached to the front rolling tab 111, and the first rubber body 123 is disposed between the first outer frame 121 and the first inner frame 122.

As shown in fig. 1 to fig. 3, the first outer frame 121 and the first inner frame 122 enclose a first cavity with two open ends, and the first rubber body 123 is filled in the first cavity, wherein the first protrusion 1231 of the first rubber body 123 is disposed on the end surface of the first flange 1211. When the wheel is subjected to small lateral force, the lateral force transmitted to the leaf spring assembly is transmitted to the frame front bracket only by the inner frame 122, namely only the shear deformation of the first rubber body 123 of the front bushing is buffered and limited; when the wheel is subjected to a large lateral force, the lateral force transmitted to the leaf spring assembly is firstly buffered through the shearing deformation of the front bushing first rubber body 123 with small rigidity, and when the deformation is greater than the height difference between the inner frame 122 and the first bump 1231, the first bump 1231 starts to compress and deform and is limited with the shearing deformation of the bushing first rubber body 123. And then make the impact sense of transmitting to the frame fore-stock reduce greatly, improve bearing capacity in order to resist great lateral force while satisfying ride comfort.

In a preferred embodiment of the present invention, a first flange 1211 extends from a first outer end of one side of the first outer frame 121 to the outer periphery, and the first flange 1211 is closely attached to the side end surface of the front ear 111.

As shown in fig. 1 to 3, the first turned-up edge 1211 is interposed between the front frame bracket and the front rolling lug 111, so that the front bushing 12 is integrally clamped between the front frame bracket and the front rolling lug 111, the axial rigidity of the front bushing 12 on the side close to the front frame bracket is increased, a lateral force acts on the center of the wheel and along the y-axis, that is, the left and right directions of the vehicle body due to a centrifugal effect when the road surface inclines or runs in a curve, and when the rim of the wheel receives a large lateral force, the front bushing 12 with the first turned-up edge 1211 can prevent the front frame bracket from interfering with the first main spring 11 to cause abnormal sound.

In a preferred embodiment of the present invention, a first inner end surface of the first inner frame 122 near the first outer end surface side is provided with a first tooth surface 1221 to increase the friction coefficient of the front bushing 12.

As shown in fig. 2 and 3, a standard bolt can be used to replace the front plate pin for connecting the front bracket of the frame with the front rolling lug 111, i.e. the front plate pin is standardized, and compared with the front plate pin manufactured by a stamping process and a welding process in the prior art, the part manufacturing precision is improved. The first inner frame 122 is in contact with the frame front support, a first tooth surface 1221 is arranged on one side end face of the first inner frame 122, bolts sequentially penetrate through the frame front support and the first inner frame 122 and then are in threaded connection with nuts, certain pre-tightening force needs to be applied to the bolts in order to avoid relative sliding of the front bushing 12 and the frame front support, when an automobile is subjected to all-directional force with fixed size, the first tooth surface 1221 increases the friction coefficient between the front bushing 12 and the frame front support, the pre-tightening force required by the bolts in resisting lateral force is reduced, the total contact surface pressure resisting sliding is reduced, the minimum anti-sliding safety coefficient is increased, and torque attenuation is prevented.

In a preferred embodiment of the present invention, the rear bushing 13 includes a second outer frame 131, a second inner frame 132 and a second rubber body 133, the second outer frame 131 is closely attached to the rear rolling tab 112, and the second rubber body 133 is disposed between the second outer frame 131 and the second inner frame 132.

As shown in fig. 1, 4 and 5, the second outer frame 131 and the second inner frame 132 enclose a second cavity with two open ends, and the second rubber 133 is filled in the second cavity, wherein the second protrusion 1331 of the second rubber 133 is disposed on the end surface of the second flange 1311. When the wheel is subjected to a small lateral force, the lateral force transmitted to the leaf spring assembly is only transmitted to the rear lifting lug 5 through the inner framework 132, namely, the lateral force is only buffered and limited through the shearing deformation of the rear bushing second rubber body 123; when the wheel is subjected to a large lateral force, the lateral force transmitted to the leaf spring assembly is firstly buffered by the shear deformation of the front bushing second rubber body 133 with small rigidity, and when the deformation amount is larger than the height difference between the inner frame 132 and the second projection 1331, the second projection 1331 starts to compress and deform, and is limited by the shear deformation of the bushing second rubber body 133. And then make the impact sense of transmitting to back lug 5 reduce greatly, improve bearing capacity in order to resist great lateral force when satisfying ride comfort and travelling comfort.

In a preferred embodiment of the present invention, a second flange 1311 extends from the second outer end of the second outer frame 131 to the outer periphery, and the second flange 1311 is closely attached to the side end of the rear rolling ear 112.

As shown in fig. 1, 4 and 5, the second flange 1311 is interposed between the rear lifting lug 5 and the rear rolling lug 112, so that the second flange 1311 of the left rear bushing 13 is clamped between the left side of the rear lifting lug 5 and the left side of the rear rolling lug 112, the second flange 1311 of the right rear bushing 13 is clamped between the right side of the rear lifting lug 5 and the right side of the rear rolling lug 112, axial rigidity of the left end of the left rear bushing 13 and the right end of the right rear bushing 13 is increased, a lateral force acts on the center of the wheel and along the y axis, that is, the left and right direction of the vehicle body due to a centrifugal effect when a road surface inclines or runs in a curve, and when a rim of the wheel receives a large lateral force, the rear bushing 13 with the second flange 1311 can avoid the interference between the rear lifting lug 1315 and the first main spring plate 11 to cause abnormal sound.

In a preferred embodiment of the present invention, a second tooth surface is provided on a second inner end surface of the second inner frame 132 near the second outer end surface side to increase the friction coefficient of the rear bushing 13.

As shown in fig. 4 and 5, a standard bolt can be used to replace the rear lifting lug 5 pin for connecting the rear lifting lug 5 and the rear rolling lug 112, i.e. the rear lifting lug 5 pin is standardized, and compared with the rear lifting lug 5 pin manufactured by a stamping process and a welding process in the prior art, the part manufacturing precision is improved. The second inner frame 132 is in contact with the rear lifting lug 5, a second tooth surface is arranged on one side end face of the second inner frame 132, the bolt sequentially penetrates through the left side of the rear lifting lug 5, the second inner frame 132 and the right side of the rear lifting lug 5 and then is in threaded connection with the nut, certain pre-tightening force needs to be applied to the bolt in order to avoid relative sliding of the two rear bushings 13 and the rear lifting lug 5, when the automobile is subjected to the forces in all directions with fixed sizes, the friction coefficient between the rear bushings 13 and the rear lifting lug 5 is increased through the second tooth surface, the pre-tightening force required by the bolt in resisting the lateral force is reduced, the total pressure of the contact surface resisting sliding is reduced, the minimum anti-sliding safety coefficient is increased, and the torque attenuation is prevented. Of course, the second flank may not be provided if the relative sliding between the rear lifting lug 5 and the rear bushing 13 does not occur with sufficient minimum residual pretension.

In a preferred embodiment of the present invention, the main spring group 1 further includes a second main spring 14, a third main spring 15, a fourth main spring 16 and a fifth main spring 17 which are sequentially overlapped from top to bottom under the first main spring 11, the first main spring 11 the second main spring 14 the third main spring 15 the fourth main spring 16 and the fifth main spring 17 pass through the central bolt 3 rigid coupling, the first main spring 11 the second main spring 14 and the third main spring 15 are fixedly coupled through a first clamp 18.

As shown in fig. 1, when the load impact on the automobile is small, the main spring group 1 acts alone and is formed by attaching five main spring pieces, namely a first main spring piece 11, a second main spring piece 14, a third main spring piece 15, a fourth main spring piece 16, a fifth main spring piece 17 and the like, the number is small, the elastic deformation capacity is strong, the damping effect is good, when the load impact on the automobile is large, the main spring group 1 and the auxiliary spring group 2 bear the load at the same time, the overall strength and the rigidity are high, and the large load impact can be borne. In order to ensure that the first main reed 11, the second main reed 14 and the third main reed 15 are sequentially tightly attached and maintain the stability of relative positions, the front ends and the rear ends of the three main reeds are respectively fixed by a first clamp 18, preferably, the first clamp 18 is a C-shaped clamp and is riveted with the third main reed 15 by a rivet, and further, the first main reed 11, the second main reed 14 and the third main reed 15 are prevented from being staggered with each other to cause the independent stress of the first main reed 11.

Preferably, the lengths of the first main reed 11, the second main reed 14, the third main reed 15, the fourth main reed 16 and the fifth main reed 17 are sequentially shortened, so that the main spring group 1 is closer to an isostress beam, and the bearing capacity and the safety of the main spring group 1 are improved.

In a preferred embodiment of the present invention, the auxiliary spring set 2 comprises a first auxiliary spring 21 and a second auxiliary spring 22 stacked from top to bottom, the first auxiliary spring 21 and the second auxiliary spring 22 are fixedly connected by a second clamping hoop 23.

As shown in fig. 1, in order to ensure that the first sub-spring 21 and the second sub-spring 22 are tightly attached and maintain the stability of the relative positions, the front ends and the rear ends of the first sub-spring 21 and the second sub-spring 22 are respectively fixed by a second clamp 23, preferably, the second clamp 23 is a C-shaped clamp and is riveted with the second sub-spring 22 by a rivet, and further, the first sub-spring 21 and the second sub-spring 22 are prevented from being staggered with each other to cause the independent stress of the first sub-spring 21.

Preferably, the lengths of the first sub spring piece 21 and the second sub spring piece 22 are sequentially shortened, so that the sub spring group 2 is closer to the equal stress beam, and the bearing capacity and the safety of the sub spring group 2 are improved.

In a preferred embodiment of the present invention, a cushion block 4 is sandwiched between the auxiliary spring group 2 and the first main spring 11, and the central bolt 3 sequentially passes through the auxiliary spring group 2, the cushion block 4 and the main spring group 1 and then is fixed to the nut by screwing.

As shown in fig. 1, the spacer 4 prevents the auxiliary spring group 2 from interfering with the main spring group 1 during operation. Preferably, the spacer 4 is arranged between the first main leaf 11 and the second sub leaf 22.

The utility model discloses a leaf spring assembly includes main spring group 1, vice spring group 2 and central bolt 3, rear axle assembly 6 is fixed in central bolt 3 department with U type bolt, constitute the rear suspension system with the leaf spring assembly, the front eye 111 of first main reed 11 passes front bush 12 through the bolt and is connected with the front bracket of frame, rear eye 112 passes two rear bushes 13 through the bolt and is connected with rear lug 5, central bolt 3 connects main spring group 1 and vice spring group 2, fix rear axle assembly 6 in central bolt 3 department with U type bolt and constitute the rear suspension assembly, part and assembly process have been reduced, production beat has been improved; the front bushing 12 and the rear bushing 13 are both bushings with flanges on one side, so that abnormal sound caused by interference between the frame and the first main reed 11 when a large lateral force is applied to the frame is avoided; the end part of the first inner framework 122 of the front bushing 12 is provided with a first tooth surface 1221, the end part of the second inner framework 132 of the rear bushing 13 is provided with a second tooth surface, the friction coefficient of the rear bushing is improved, and meanwhile, the front plate pin, the rear lug pin and the lug plate are replaced by standard fasteners, so that the part manufacturing precision is improved, the minimum anti-sliding safety coefficient of a connecting point is improved, and the torque attenuation is prevented.

In the embodiments of the present invention, the term "plurality" means two or more unless explicitly defined otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly and include, for example, fixed connections, removable connections, or integral connections. The specific meaning of the above terms in the embodiments of the present invention can be understood by those skilled in the art according to specific situations.

In the description of the embodiments of the present invention, it should be understood that the terms "upper" and "lower" are used for indicating the position or the positional relationship based on the position or the positional relationship shown in the drawings, and are only for convenience of describing the embodiments of the present invention and simplifying the description, but not for indicating or implying that the indicated device or unit must have a specific direction, be constructed and operated in a specific position, and thus, should not be construed as limiting the embodiments of the present invention.

In the description herein, the description of the terms "one embodiment," "a preferred embodiment," etc. means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the embodiments of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made to the embodiment of the present invention by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the embodiments of the present invention should be included in the protection scope of the embodiments of the present invention.

Claims

1. A leaf spring assembly, comprising:

the main spring group (1) comprises a first main spring (11), a front bushing (12) and two rear bushings (13), the front end of the first main reed (11) is rolled to form a front rolling lug (111), the rear end is rolled to form a rear rolling lug (112), the front bushings (12) are arranged in the front rolling lug (111) and are in interference fit with the front rolling lug (111), the two rear bushings (13) are symmetrically arranged in the rear rolling lug (112) by the central axis of the first main reed (11), the rear bushing (13) is in interference fit with the rear rolling lug (112), the front bushing (12) comprises a first outer framework (121), a first inner framework (122) and a first rubber body (123), the first outer framework (121) is tightly attached to the front rolling lug (111), and the first rubber body (123) is arranged between the first outer framework (121) and the first inner framework (122);

an auxiliary spring group (2), wherein the auxiliary spring group (2) is arranged above the first main reed (11); and

and the central bolt (3) is used for fixing the main spring set (1) and the auxiliary spring set (2).

2. The leaf spring assembly according to claim 1, wherein a first flange (1211) extends from a first outer end of one side of the first outer frame (121) to the outer periphery, and the first flange (1211) is closely attached to a side end face of the front rolling lug (111).

3. The leaf spring assembly according to claim 2, wherein a first inner end surface of the first inner frame (122) on a side close to the first outer end surface is provided with a first tooth surface (1221) to increase a friction coefficient of the front bushing (12).

4. The leaf spring assembly according to claim 1, wherein the rear bushing (13) comprises a second outer frame (131), a second inner frame (132), and a second rubber body (133), the second outer frame (131) closely fitting the rear eye (112), the second rubber body (133) being disposed between the second outer frame (131) and the second inner frame (132).

5. The assembly as claimed in claim 4, wherein a second flange (1311) extends from a second outer end of one side of the second outer frame (131) to the outer periphery, and the second flange (1311) is closely attached to a side end surface of the rear rolling lug (112).

6. The leaf spring assembly according to claim 5, wherein a second inner end surface of the second inner frame (132) on a side close to the second outer end surface is provided with a second tooth surface to increase the friction coefficient of the rear bush (13).

7. The leaf spring assembly according to claim 1, wherein the main spring group (1) further comprises a second main spring (14), a third main spring (15), a fourth main spring (16) and a fifth main spring (17) which are sequentially stacked below the first main spring (11) from top to bottom, the first main spring (11), the second main spring (14), the third main spring (15), the fourth main spring (16) and the fifth main spring (17) are fixedly connected through the central bolt (3), and the first main spring (11), the second main spring (14) and the third main spring (15) are fixedly connected through a first clamp (18).

8. The leaf spring assembly according to claim 1, wherein the auxiliary spring set (2) comprises a first auxiliary spring plate (21) and a second auxiliary spring plate (22) which are sequentially overlapped from top to bottom, and the first auxiliary spring plate (21) and the second auxiliary spring plate (22) are fixedly connected through a second clamping hoop (23).

9. The leaf spring assembly according to claim 1, wherein a cushion block (4) is interposed between the auxiliary spring set (2) and the first main leaf spring (11), and the central bolt (3) passes through the auxiliary spring set (2), the cushion block (4) and the main spring set (1) in sequence and then is fixed with a nut in a threaded manner.