Transverse torsion bar spring for motor vehicle suspension

Abstract

A transverse torsion bar spring for a motor vehicle suspension comprises a torsion bar extending transversely, the middle position of the torsion bar is fixedly connected with a middle rocker arm assembly in the circumferential direction, the two ends of the torsion bar are fixedly connected with side rocker arm assemblies in the circumferential direction respectively, and the transverse torsion bar spring of an E-shaped structure for axially positioning the torsion bar is formed. The middle rocker arm assembly comprises a middle rocker arm and a middle adjusting rod, one end of the middle rocker arm is circumferentially and fixedly connected to the middle of the torsion bar, the other end of the middle rocker arm is fixedly connected to the upper end of the middle adjusting rod, the lower end of the middle adjusting rod extends into a longitudinal strip-shaped hole formed in the frame cross beam or the auxiliary frame cross beam, and the middle adjusting rod is prevented from retreating from the strip-shaped hole through a limiting device. The side rocker arm assembly comprises a side rocker arm and a side adjusting rod, one ends of the left rocker arm and the right rocker arm are circumferentially fixed to the two ends of the torsion rod respectively, the other ends of the left rocker arm and the right rocker arm are movably connected with the upper ends of the left adjusting rod and the right adjusting rod respectively through ball joints, and the lower ends of the left adjusting rod and the right adjusting rod are fixedly connected with the left lower swing arm and the right lower swing arm or the left shock absorber cylinder and the right shock absorber cylinder respectively.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of motor vehicle suspension, in particular to a transverse torsion bar spring for motor vehicle suspension. BACKGROUND

[0002] The intelligent transformation of the urban terminal distribution field is accelerating, and the large-scale application of low-speed unmanned logistics vehicles in emerging scenarios such as instant retail and community group purchase has entered an industrial explosion period. According to authoritative monitoring data, since 2023, the daily average volume of unmanned distribution vehicles of leading enterprises has broken through 3 million, and the exponential growth of business scale has put forward double technical indicators for vehicle carrying systems: not only to achieve a loading efficiency of ≥85% of the container volume rate, but also to strictly control the chassis ground clearance within 180mm to meet the barrier-free loading and unloading needs of urban high-frequency distribution scenarios.

[0003] The structural limitations of traditional suspension systems are increasingly prominent. The suspension elastic elements of the current box-type logistics vehicles mainly adopt spiral spring or torsion bar spring structure.

[0004] Among them, the spiral spring itself has no damping effect, so a shock absorber must be installed separately in the spiral spring suspension. In addition, the spiral spring can only bear vertical load, so a guide mechanism must be installed to transmit various forces and torques other than vertical force. Therefore, using a spiral spring as a suspension elastic element has the following technical bottlenecks: the effective loading space of the container is occupied by more than 12% due to the complex mechanical structure; the high proportion of spring mass seriously restricts the dynamic response performance of the vehicle; the traditional suspension stroke parameters and the low chassis structure design exist systematic conflicts, making it difficult to balance the vehicle's passability and loading efficiency.

[0005] CN102756627B discloses a spring structure for motor vehicle wheel suspension, which is a transverse torsion bar spring. However, in the technical solution of CN102756627B, a torsion adjuster, a hollow cylindrical connecting bracket and other components are provided. On the one hand, this structure has high production cost and complex maintenance, which is not conducive to the large-scale use of low-speed unmanned logistics vehicles. On the other hand, the large number of components greatly occupy the effective loading space of the container, making it difficult to meet the distribution needs. SUMMARY

[0006] The utility model aims at the insufficient of prior art, provides a kind of transverse torsion bar spring for motor vehicle suspension, including the torsion bar that extends horizontally, the intermediate position of the torsion bar is fixedly connected with one intermediate rocker assembly periphery, the both ends of the torsion bar are fixedly connected with side rocker assembly periphery respectively, form the E-shaped structure transverse torsion bar spring that is positioned to the torsion bar axial, to realize space optimization and the adjustment of vehicle height, suspension stiffness with lower cost.

[0007] The utility model discloses a purpose is realized with the following scheme:

[0008] A kind of transverse torsion bar spring for motor vehicle suspension, including transversely extending torsion bar, intermediate position of the torsion bar is circumferentially fixedly connected with intermediate rocker assembly, two ends of the torsion bar are circumferentially fixedly connected with side rocker assembly respectively, form the E-shaped structure transverse torsion bar spring of torsion bar axial positioning;

[0009] The intermediate rocker assembly includes intermediate rocker, intermediate adjusting rod, one end of the intermediate rocker is circumferentially fixedly connected in the middle of torsion bar, the other end is fixedly connected on the upper end of intermediate adjusting rod, the lower end of the intermediate adjusting rod extends into the longitudinal strip-shaped hole opened on the cross beam of frame or subframe cross beam, and the intermediate adjusting rod is prevented from exiting strip-shaped hole by limiting device;

[0010] The side rocker assembly includes side rocker, side adjusting rod, left and right side rockers one end is circumferentially fixed in the two ends of torsion bar respectively, left and right side rockers other end is movably connected with the upper end of left and right side adjusting rods through ball hinge joint respectively, and the lower end of the left and right side adjusting rods is fixedly connected with left and right lower swing arms or left and right shock absorber cylinders respectively.

[0011] Preferably, the torsion bar is composed of left and right torsion bars, the left and right torsion bars are provided with external splines at two ends, one end of the intermediate rocker is provided with an internal spline sleeve, the internal spline sleeve is provided with a partition wall, one end of the side rocker is provided with an internal spline blind hole pipe, and the two ends of the left and right torsion bars are engaged with the internal spline sleeve and the internal spline blind hole pipe respectively and abut against the hole bottom of the internal spline blind hole pipe and the partition wall, so as to realize the axial positioning of the torsion bar.

[0012] Preferably, the torsion bar is composed of left and right torsion bars, the left and right torsion bars are provided with external splines at two ends, one end of the intermediate rocker is provided with an internal spline sleeve, the internal spline sleeve is provided with a partition wall, one end of the side rocker is provided with an internal spline blind hole pipe, and the two ends of the left and right torsion bars are engaged with the internal spline sleeve and the internal spline blind hole pipe respectively and abut against the hole bottom of the internal spline blind hole pipe and the partition wall, so as to realize the axial positioning of the torsion bar.

[0013] Preferably, the intermediate adjusting rod is an external thread rod, one end of the intermediate rocker is provided with an internal thread hole, and the upper end of the intermediate adjusting rod is threadedly matched in the internal thread hole of the intermediate rocker.

[0014] Alternatively, the intermediate adjusting rod is an external thread rod, one end of the intermediate rocker is provided with a through hole, the intermediate adjusting rod penetrates through the through hole of the intermediate rocker, and the intermediate rocker is fixedly connected on the upper end of the intermediate adjusting rod through bolts.

[0015] Preferably, the intermediate adjusting rod is an externally threaded rod, and the limiting device is a limiting nut, the lower end of the intermediate adjusting rod extends into a longitudinal strip-shaped hole formed on the vehicle frame cross beam or the auxiliary vehicle frame cross beam, and is threadedly connected with a limiting nut to prevent the intermediate adjusting rod from being withdrawn from the strip-shaped hole.

[0016] Preferably, the ball joint comprises a ball head pin and a ball seat, the laterally extending ball head pin is fixedly arranged at one end of the side swing arm, and the ball seat is fixedly connected to the upper end of the side adjusting rod.

[0017] Preferably, the side adjusting rod is an externally threaded rod, and an internally threaded hole is formed in the radial extension of the ball seat, the upper end of the side adjusting rod is threadedly connected in the internally threaded hole of the ball seat.

[0018] Alternatively, the side adjusting rod is an externally threaded rod, and a through hole is formed in the radial extension of the ball seat, the side adjusting rod penetrates through the through hole of the ball seat, and the ball seat is fixedly connected to the upper end of the side adjusting rod through a bolt.

[0019] Preferably, the intermediate adjusting rod is provided with a sliding block, the upper end surface of the sliding block is a circular arc sliding surface, the lower end surface abuts against the limiting device, the vehicle frame cross beam or the auxiliary vehicle frame cross beam is provided with an arc-shaped cover plate matched with the circular arc sliding surface, and a strip-shaped hole is formed in the arc-shaped cover plate, so that the intermediate adjusting rod can be vertically swung.

[0020] The beneficial effects of the utility model are as follows:

[0021] 1. The structure is integrated and the space is optimized, the E-shaped transversely arranged torsion bar spring structure integrates the intermediate swing arm assembly, the side swing arm assembly and the torsion bar, when the wheel jumps, the side swing arm assembly swings around the torsion bar axis, the torsion bar is elastically deformed in torsion, so as to ensure the elastic connection between the wheel and the frame. Compared with the traditional suspension, this layout form reduces the space occupation of the motor vehicle cargo compartment, reduces the unsprung mass, achieves the balance between light weight and strength, and is suitable for the production of low chassis vehicles.

[0022] 2. The height of the vehicle body and the suspension stiffness are adjustable, the distance between the side swing arm and the left and right lower swing arms or the left and right shock absorber cylinders is changed by adjusting the side adjusting rod, the preload height of the wheel is changed, the height of the vehicle body is adjusted, and the suspension stiffness is adjusted by adjusting the diameter of the torsion bar and the axial stiffness of the side swing arm. BRIEF DESCRIPTION OF DRAWINGS

[0023] Fig. 1 It is a schematic view of the assembly structure of the utility model;

[0024] Fig. 2 It is a schematic view of the structure of one embodiment of the utility model;

[0025] Fig. 3 It is a schematic view of the assembly of the intermediate adjusting rod in the utility model. Detailed Implementation

[0026] like Figs. 1 to 3 As shown, a transverse torsion bar spring for motor vehicle suspension includes a transversely extending torsion bar 1. A middle rocker arm assembly is circumferentially fixedly connected to the middle position of the torsion bar 1, and side rocker arm assemblies are circumferentially fixedly connected to both ends of the torsion bar 1, forming an E-shaped transverse torsion bar spring that axially positions the torsion bar 1.

[0027] The intermediate rocker arm assembly includes an intermediate rocker arm 2 and an intermediate adjusting rod 4. One end of the intermediate rocker arm 2 is circumferentially fixed to the middle of the torsion bar 1, and the other end is fixedly connected to the upper end of the intermediate adjusting rod 4. The lower end of the intermediate adjusting rod 4 extends into the longitudinal strip hole 5 opened on the crossbeam of the vehicle frame or the crossbeam of the sub-vehicle frame, and a limiting device prevents the intermediate adjusting rod 4 from exiting the strip hole 5.

[0028] The side rocker arm assembly includes a side rocker arm 7 and a side adjusting rod 8. One end of the left and right rocker arms 7 is circumferentially fixed to both ends of the torsion bar 1, and the other end of the left and right rocker arms 7 is movably connected to the upper end of the left and right adjusting rods 8 through ball joints. The lower ends of the left and right adjusting rods 8 are fixedly connected to the left and right lower swing arms or the left and right shock absorber cylinders, respectively.

[0029] In this embodiment, the torsion bar 1 consists of a left torsion bar 12 and a right torsion bar 13. Both ends of the left and right torsion bars are provided with external splines. One end of the middle rocker arm 2 is fixed with a laterally extending internal spline sleeve 10. The internal spline sleeve 10 is provided with a partition wall 14, which divides the internal spline sleeve 10 into two parts, forming two internal spline blind holes that open laterally to both ends. One end of the side rocker arm 7 is fixed with a laterally extending internal spline blind hole tube 11. One end of the left torsion bar 12 is connected to the internal spline sleeve 13. One end of the key sleeve 10 engages with the other end of the inner spline blind hole tube 11 of the left rocker arm 7. One end of the left torsion bar 12 abuts against the partition wall 14, and the other end abuts against the bottom of the hole of the inner spline blind hole tube 11, thus axially positioning the left torsion bar 12. One end of the right torsion bar 13 engages with the inner spline sleeve 10, and the other end engages with the inner spline blind hole tube 11 of the right rocker arm 7. One end of the right torsion bar 13 abuts against the partition wall 14, and the other end abuts against the bottom of the hole of the inner spline blind hole tube 11, thus axially positioning the right torsion bar 13.

[0030] In another embodiment, the torsion bar 1 is a single torsion bar 1. The torsion bar 1 has external splines at its middle position and both ends. One end of the middle rocker arm 2 is fixed with a laterally extending internal spline sleeve 10, which engages with the external splines in the middle of the torsion bar 1. One end of the side rocker arm 7 is fixed with a laterally extending internal spline blind hole tube 11, which engages with the external splines at both ends of the torsion bar 1. Both ends of the torsion bar 1 abut against the bottom of the hole of the internal spline blind hole tube 11 to achieve axial positioning of the torsion bar 1.

[0031] The torsion bar 1 is preferably not a whole spline bar, because the spline bar is easy to be damaged when it is twisted.

[0032] In this embodiment, the intermediate adjusting rod 4 is an external thread rod, one end of the intermediate rocker arm 2 is provided with a through hole, the axial direction of the through hole and the axial direction of the intermediate rocker arm 2 form a 90-degree angle, the intermediate adjusting rod 4 penetrates the through hole of the intermediate rocker arm 2, and the intermediate rocker arm 2 is fixedly connected to the upper end of the intermediate adjusting rod 4 through two bolts arranged on the upper and lower sides of the intermediate rocker arm 2.

[0033] In another embodiment, the intermediate adjusting rod 4 is an external thread rod, one end of the intermediate rocker arm 2 is provided with an internal thread hole, the axial direction of the internal thread hole and the axial direction of the intermediate rocker arm 2 form a 90-degree angle, and the upper end of the intermediate adjusting rod 4 is screwed into the internal thread hole of the intermediate rocker arm 2 to fixedly connect the intermediate rocker arm 2 to the upper end of the intermediate adjusting rod 4.

[0034] The intermediate adjusting rod 4 is an external thread rod, the limiting device is a limiting nut 6, the lower end of the intermediate adjusting rod 4 extends into a longitudinal strip-shaped hole 5 formed on the frame cross beam or the auxiliary frame cross beam, and is screwed with a limiting nut 6, the outer diameter of the limiting nut 6 should be larger than the width of the strip-shaped hole 5, so as to prevent the intermediate adjusting rod 4 from exiting the strip-shaped hole 5.

[0035] The spherical hinge joint includes a ball head pin 15 and a ball seat 16, the laterally extending ball head pin 15 is fixedly arranged at one end of the side rocker arm 7, and the ball seat 16 is fixedly connected to the upper end of the side adjusting rod 8.

[0036] In this embodiment, the side adjusting rod 8 is an external thread rod, the radial extension of the ball seat 16 is provided with an internal thread hole, the upper end of the side adjusting rod 8 is screwed into the internal thread hole of the radial extension of the ball seat 16 to form a fixed connection, and a nut is further screwed on the side adjusting rod 8, the nut abuts against the upper end of the radial extension of the ball seat 16, and is used to assist in fixedly connecting the ball seat 16 to the upper end of the side adjusting rod 8.

[0037] In another embodiment, the side adjusting rod 8 is an external thread rod, the radial extension of the ball seat 16 is provided with a through hole, the side adjusting rod 8 penetrates the through hole of the ball seat 16, and the ball seat 16 is fixedly connected to the upper end of the side adjusting rod 8 through two bolts.

[0038] The intermediate adjusting rod 4 is provided with a sliding block 17, the upper end surface of the sliding block 17 is a circular arc sliding surface, the lower end surface abuts against the limiting device, the frame cross beam or the auxiliary frame cross beam is provided with an arc-shaped cover plate 18 matched with the circular arc sliding surface, the arc-shaped cover plate 18 is provided with a strip-shaped hole 5, and the intermediate adjusting rod 4 is longitudinally swung.

[0039] Working principle: when the two sides of the wheel are jumped by vertical direction load, the side swing arm assembly swings around the torsion bar axis, makes the torsion bar produce torsional elastic deformation, thereby guaranteeing the elastic connection of the wheel pre-carriage.

[0040] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification made by those skilled in the art without departing from the spirit of the present application falls within the scope of the present application.

Claims

1. A transverse torsion bar spring for a motor vehicle suspension, characterized by: The application relates to a transversely-extending torsion bar (1) which is fixedly connected with a middle rocker arm assembly at a middle position in a circumferential direction, and is fixedly connected with side rocker arm assemblies at two ends in the circumferential direction, so as to form an E-shaped structure transversely-arranged torsion bar spring which is axially positioned; The middle rocker arm assembly comprises a middle rocker arm (2) and a middle adjusting rod (4), one end of the middle rocker arm (2) is fixedly connected with the middle part of the torsion bar (1) in the circumferential direction, the other end is fixedly connected with the upper end of the middle adjusting rod (4), the lower end of the middle adjusting rod (4) extends into a longitudinal strip-shaped hole (5) arranged on a frame cross beam or a sub-frame cross beam, and a limiting device is arranged to prevent the middle adjusting rod (4) from exiting the strip-shaped hole (5); The side rocker arm assembly comprises side rocker arms (7) and side adjusting rods (8), one end of the left and right side rocker arms (7) is fixedly connected with the two ends of the torsion bar (1) in the circumferential direction, the other end of the left and right side rocker arms (7) is movably connected with the upper end of the left and right side adjusting rods (8) through a ball hinge joint, and the lower end of the left and right side adjusting rods (8) is fixedly connected with a left lower swing arm or a right lower swing arm or a left shock absorber cylinder or a right shock absorber cylinder.

2. The transverse torsion bar spring for a motor vehicle suspension of claim 1 wherein: The torsion bar (1) is composed of a left torsion bar (12) and a right torsion bar (13), the two ends of the left and right torsion bars are provided with external splines, one end of the middle rocker arm (2) is provided with an internal spline sleeve (10), the internal spline sleeve (10) is internally provided with a partition wall (14), one end of the side rocker arm (7) is provided with an internal spline blind hole pipe (11), and the two ends of the left and right torsion bars are respectively engaged with the internal spline sleeve (10) and the internal spline blind hole pipe (11) and abut against the hole bottom of the internal spline blind hole pipe (11) and the partition wall (14), so as to axially position the torsion bar (1).

3. The transverse torsion bar spring for a motor vehicle suspension of claim 1 wherein: The middle part and the two ends of the torsion bar (1) are provided with external splines, one end of the middle rocker arm (2) is provided with an internal spline sleeve (10), the internal spline sleeve (10) is engaged with the external spline of the middle part of the torsion bar (1), one end of the side rocker arm (7) is provided with an internal spline blind hole pipe (11), the internal spline blind hole pipe (11) is engaged with the external splines of the two ends of the torsion bar (1), and the two ends of the torsion bar (1) abut against the hole bottom of the internal spline blind hole pipe (11), so as to axially position the torsion bar (1).

4. The transverse torsion bar spring for a motor vehicle suspension of claim 1 wherein: The middle adjusting rod (4) is an external thread rod, one end of the middle rocker arm (2) is provided with an internal thread hole, and the upper end of the middle adjusting rod (4) is threadedly matched in the internal thread hole of the middle rocker arm (2); Alternatively, the middle adjusting rod (4) is an external thread rod, one end of the middle rocker arm (2) is provided with a through hole, the middle adjusting rod (4) penetrates through the through hole of the middle rocker arm (2), and the middle rocker arm (2) is fixedly connected with the upper end of the middle adjusting rod (4) through a bolt.

5. The transverse torsion bar spring for a motor vehicle suspension of claim 1 wherein: The middle adjusting rod (4) is an external thread rod, the limiting device is a limiting nut (6), the lower end of the middle adjusting rod (4) extends into the longitudinal strip-shaped hole (5) arranged on the frame cross beam or the sub-frame cross beam, and is threadedly matched with a limiting nut (6), so as to prevent the middle adjusting rod (4) from exiting the strip-shaped hole (5).

6. The transverse torsion bar spring for a motor vehicle suspension of claim 1 wherein: The ball joint comprises a ball head pin (15) and a ball seat (16), the transversely extending ball head pin (15) is fixed at one end of the side rocker arm (7), and the ball seat (16) is fixedly connected to the upper end of the side adjusting rod (8).

7. The transverse torsion bar spring for a motor vehicle suspension of claim 6 wherein: The side adjusting rod (8) is an externally threaded rod, the radial extension of the ball seat (16) is provided with an internally threaded hole, and the upper end of the side adjusting rod (8) is threadedly connected to the internally threaded hole of the ball seat (16). Alternatively, the side adjusting rod (8) is an externally threaded rod, the radial extension of the ball seat (16) is provided with a through hole, the side adjusting rod (8) penetrates through the through hole of the ball seat (16), and the ball seat (16) is fixedly connected to the upper end of the side adjusting rod (8) through a bolt.

8. The transverse torsion bar spring for a motor vehicle suspension of claim 1 wherein: The intermediate adjusting rod (4) is provided with a sliding block (17), the upper end surface of the sliding block (17) is a circular arc sliding surface, the lower end surface is in abutment with a limiting device, the frame cross beam or the auxiliary frame cross beam is provided with an arc-shaped cover plate (18) matched with the circular arc sliding surface, and the arc-shaped cover plate (18) is provided with a strip-shaped hole (5), so that the intermediate adjusting rod (4) can be longitudinally swung.

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