A leaf spring movable end bracket assembly

Abstract

The present invention relates to the field of automobile leaf spring suspension systems, and in particular to a leaf spring movable end bracket assembly. The leaf spring movable end bracket assembly of the present invention includes a lifting ear end bracket, a lifting ear, a lifting ear pin, and a leaf spring pin. The upper end of the lifting ear is connected to the lifting ear end bracket through the lifting ear pin. The lower end of the lifting ear is provided with a cavity for inserting a leaf spring movable end ear and a through hole for the leaf spring pin to penetrate. It includes a limit block for preventing the lifting ear from rotating outward. The limit block includes a fixing portion and a limiting portion. The fixing portion is fixed to the lifting ear end bracket by bolts, and the limiting portion is arranged on the outside of the lifting ear. When the front section of the leaf spring breaks, the leaf spring can be limited to move backward to avoid the leaf spring interfering with the front wheel steering system. In addition, the leaf spring movable end bracket assembly of the present invention has the characteristics of strong adaptability.

Description

Technical Field

[0001] The invention relates to the field of automobile leaf spring suspension systems, and in particular to a leaf spring movable end bracket assembly. Background Art

[0002] In the current leaf spring suspension system, the two ends of the leaf spring are respectively fixed on the fixed end bracket and the lifting eye. Since the lifting eye is connected to the lifting eye end bracket by a pin shaft, when the front half of the single leaf spring breaks, the lifting eye swings backward around the lifting eye pin, and the rear half of the leaf spring moves backward with the front axle. The distance between the center of the equivalent guide rod corresponding to the single leaf spring and the center of the steering gear rocker arm increases significantly, which will seriously interfere with the steering system in a short period of time, causing abnormal steering of the front wheels and affecting driving safety. Moreover, since the leaf spring on one side loses its load-bearing function, the vehicle operating condition will change from an empty or fully loaded condition to an extreme upward jump condition in a short period of time. In order to address the above problems, a common solution is to improve the structure of the ear-end bracket and add a horn structure to the structure of the existing ear-end bracket. After the single leaf spring breaks, the leaf spring ear can be stuck on the horn structure of the ear-end bracket to prevent the leaf spring from moving backward. However, changing the ear-end bracket is very difficult in actual application. For example, the ear-end bracket needs to be redesigned for different frames and layouts, resulting in the left and right sides being not universal, the modular design being difficult, the production and installation costs being high, and the inventory maintenance being complicated. For example, when the ear-end bracket with the horn structure is cracked, the bracket needs to be replaced together, resulting in long maintenance hours, high maintenance costs, and high requirements for the maintenance workshop. Summary of the invention

[0003] In order to solve the above problems, the purpose of the present invention is to provide a leaf spring movable end bracket assembly, which can limit the backward displacement of the leaf spring when the front section of the leaf spring breaks, thereby avoiding the leaf spring from interfering with the front wheel steering system, and the leaf spring movable end bracket assembly of the present invention has the characteristic of strong adaptability.

[0004] To achieve the above-mentioned purpose, the present invention provides a leaf spring movable end bracket assembly, including an ear end bracket, an ear, an ear pin, and a leaf spring pin. The upper end of the ear is connected to the ear end bracket through the ear pin, and the lower end of the ear is provided with a cavity for inserting a leaf spring movable end ear and a through hole for the leaf spring pin to pass through. It includes a limit block for preventing the ear from rotating outward, and the limit block includes a fixing portion and a limiting portion. The fixing portion is fixed to the ear end bracket by bolts, and the limiting portion is arranged on the outside of the ear.

[0005] As a preferred embodiment, the lifting ear end bracket includes a bracket body and a first pin hole seat and a second pin hole seat arranged at the lower end of the bracket body; the lifting ear includes a first connecting arm and a second connecting arm, the upper end of the first connecting arm is connected to the first pin hole seat through the lifting ear pin shaft, and the lower end of the first connecting arm is provided with a through hole for the leaf spring pin shaft to pass through; the upper end of the second connecting arm is connected to the second pin hole seat through the lifting ear pin shaft, and the lower end of the second connecting arm is provided with a through hole for the leaf spring pin shaft to pass through; a cavity for inserting the movable end ear of the leaf spring is formed between the first connecting arm and the second connecting arm.

[0006] As a preferred embodiment, the first connecting arm includes a first upper side wall section, a first lower side wall section and a first curved side wall section connecting the first upper side wall section and the first lower side wall section, the first upper side wall section is fitted with the inner wall surface of the first pin hole seat, and the first lower side wall section is located directly below the first pin hole seat; the second connecting arm includes a second upper side wall section, a second lower side wall section and a second curved side wall section connecting the second upper side wall section and the second lower side wall section, the second upper side wall section is fitted with the inner wall surface of the second pin hole seat, and the second lower side wall section is located directly below the second pin hole seat.

[0007] As a preferred embodiment, the ear also includes a connecting tube, which has an ear pin hole along its axial direction and running through the entire connecting tube. The first connecting arm is formed by the outer end surface of the connecting tube extending downward, and the second connecting arm is formed by the inner end surface of the connecting tube extending downward, and the first connecting arm and the second connecting arm are symmetrically arranged with the radial center line of the connecting tube as the axis of symmetry.

[0008] As a preferred embodiment, the limit block is provided with one piece, the limit portion of the limit block is formed by extending obliquely downward along the lower edge of the fixed portion, the angle between the fixed portion and the limit portion is 140°~170°, the fixed portion is fixed to the outer wall of the first pin hole seat by bolts, and the limit portion of the first limit block is located on the outer side of the first lower side wall section of the first connecting arm.

[0009] As a preferred embodiment, the limit block is provided with two blocks, namely the first limit block and the second limit block, the limit portion of the first limit block is formed by extending obliquely downward along the lower edge of the fixed portion, the angle between the fixed portion and the limit portion is 140°~170°, and the structures of the first limit block and the second limit block are greater than the same; the fixed portion of the first limit block is fixed to the outer wall of the first pin hole seat by bolts, and the limit portion of the first limit block is located on the outer side of the first lower side wall section of the first connecting arm; the fixed portion of the second limit block is fixed to the outer wall of the second pin hole seat by bolts, and the limit portion of the second limit block is located on the outer side of the lower end of the second connecting arm.

[0010] As a preferred solution, buffer pads are provided on the inner side walls of the first limiting block and the second limiting block.

[0011] A single leaf spring suspension system comprises a leaf spring movable end bracket assembly, a fixed end bracket, a single leaf spring, a front axle and a vehicle frame, wherein the fixed end ear of the single leaf spring is connected to the fixed end bracket, the movable end ear of the single leaf spring is connected to the lifting ear of the leaf spring movable end bracket assembly, and the middle part of the single leaf spring is connected to the front axle.

[0012] The advantages of the present invention are as follows: compared with the existing ear-end bracket with a horn structure, when the front section of the single leaf spring breaks, the leaf spring movable end bracket assembly of the present invention limits the rotation of the ear through the limit block, thereby avoiding the leaf spring from interfering with the front wheel steering system; and the limit block and the ear-end bracket of the present invention are split, and there is no need to produce a specific ear-end bracket. The limit block can be directly installed on the existing ear-end bracket, which has the characteristics of strong adaptability, low cost and easy installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the leaf spring movable end bracket assembly of the present invention;

[0014] Figure 2 for Figure 1 The connection relationship diagram between the lifting eye end bracket and the lifting eye;

[0015] Figure 3 for Figure 1 Schematic diagram of the structure of the middle limit block;

[0016] Figure 4 for Figure 3 Side view of

[0017] Figure 5 It is a structural schematic diagram of a single leaf spring suspension system of the present invention;

[0018] The components in the figure are numbered as follows: lifting ear end bracket 1, bracket body 11, first pin hole seat 12, second pin hole seat 13, lifting ear 2, connecting tube 21, first connecting arm 22, first upper side wall section 22a, first curved side wall section 22b, first lower side wall section 22c, second connecting arm 23, second upper side wall section 23a, second curved side wall section 23b, second lower side wall section 23c, single leaf spring 3, leaf spring ear 31, leaf spring pin shaft 4, limit block 5, fixing part 5a, threaded hole 5b, limit part 5c, buffer pad 5d, first limit block 51, second limit block 52, lifting ear pin shaft 6, frame 7, fixed end bracket 8, front axle 9, leaf spring movable end bracket assembly 10. DETAILED DESCRIPTION

[0019] In order to better understand the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific examples.

[0020] See also Figure 5 The single-leaf steel leaf spring suspension system of this embodiment includes a leaf spring movable end bracket assembly 10, a fixed end bracket 8, a single leaf spring 3, a front axle 9 and a frame 7. The fixed end ear of the single leaf spring 3 is connected to the fixed end bracket 8, the movable end ear of the single leaf spring 3 is connected to the lifting ear 2 of the leaf spring movable end bracket assembly, and the middle part of the single leaf spring 3 is connected to the front axle 9.

[0021] See also Figure 1 The leaf spring movable end bracket assembly 10 of this embodiment includes a lifting ear end bracket 1, a lifting ear 2, a lifting ear pin 6, a leaf spring pin 4, a first limit block 51, and a second limit block 52.

[0022] The bracket 1 at the lifting ear end includes a bracket body 11 and two pin hole seats extending downward from two end surfaces of the bracket body 11, respectively. The two pin hole seats are respectively a first pin hole seat 12 and a second pin hole seat 13. The first pin hole seat 12 has an inner side wall close to the leaf spring 3 and an outer side wall away from the leaf spring 3. Similarly, the second pin hole seat 13 also has an inner side wall close to the leaf spring 3 and an outer side wall away from the leaf spring 3. Through holes for inserting the lifting ear pin shaft 6 are respectively opened on the first pin hole seat 12 and the second pin hole seat 13.

[0023] Combination Figure 3 and Figure 4 As shown, the limit block 5 includes a fixed portion 5a and a limit portion 5c extending obliquely downward along the lower edge of the fixed portion 5a. A threaded hole 5b is opened on the fixed portion 5a. A buffer pad 5d is fixed to the inner wall of the limit portion 5c by cold welding. The buffer pad 5d can not only protect the limit portion 5c from impact damage under the condition of leaf spring breakage and braking, but also effectively protect the surface of the lifting ear and absorb part of the energy. The fixed portion 5a and the limit portion 5c are integrally formed, and the angle between the fixed portion 5a and the limit portion 5c is 145°, which is set based on the arrangement and deformation of the leaf spring and the interference factors between the various components. The limit block 5 has a simple structure, is easy to process and produce, and has no torsion structure, and has a high anti-extrusion strength. The limit block 5 of this embodiment is provided with two blocks, namely a first limit block 51 and a second limit block 52. The two limit blocks have the same structure and size, combined with Figure 1 As shown, the fixing portion 5a of the first limit block 51 is fixed to the outer wall of the first pin hole seat 12 of the ear end bracket 1 by bolts and threaded holes 5b, and the inner wall of the limiting portion 5c of the first limit block 51 is opposite to the lower end of the ear 2. When the ear 2 rotates outward around the ear pin shaft 6, the limiting portion 5c of the first limit block 51 can prevent the ear 2 from swinging outward; the fixing portion 5a of the second limit block 52 is fixed to the outer wall of the second pin hole seat 13 by bolts, and the inner wall of the limiting portion 5c of the second limit block 52 is opposite to the lower end of the ear 2. When the ear 2 rotates outward around the ear pin shaft 6, the limiting portion 5c of the second limit block 52 can further prevent the ear 2 from swinging outward.

[0024] Combination Figure 2 As shown, the lifting ear 2 includes a connecting tube 21, and a pin hole is opened in the connecting tube 21 along its axial direction and running through the entire connecting tube 21, the pin hole is used to insert the lifting ear pin shaft 6, and extends downward along the two end surfaces of the connecting tube 21 to form two connecting arms, the two connecting arms are respectively a first connecting arm 22 and a second connecting arm 23, the first connecting arm 22 includes a first upper side wall section 22a, a first lower side wall section 22c and a first curved side wall section 22b connecting the first upper side wall section 22a and the first lower side wall section 22c, the first upper side wall section 22a is in contact with the inner wall surface of the first pin hole seat 12, the first lower side wall section 22c is located directly below the first pin hole seat 12, the first curved side wall section 22b is a curved section bent outwardly, and the first curved side wall section 22b is used to realize that the first lower side wall section 22c of the first connecting arm 22 is directly opposite to the first pin hole seat 12, when the first limit block 51 is installed in the first pin hole When the first limit block 51 is on the outer surface of the seat 12, the limiting portion 5c of the first limit block 51 can be opposite to the first lower side wall section 22c of the first connecting arm 22, so as to play the limiting role of the first limit block 51. If the limiting portion 5c of the first limit block 51 is staggered with the first connecting arm 22, the first limit block 51 cannot play its limiting role; similarly, the second connecting arm 23 includes a second upper side wall section 23a, a second lower side wall section 23c and a second curved side wall section 23b connecting the second upper side wall section 23a and the second lower side wall section 23c. The second upper side wall section 23a is in contact with the inner wall surface of the second pin hole seat 13, and the second lower side wall section 23c is located directly below the second pin hole seat 12; the first connecting arm 22 and the second connecting arm 23 are symmetrically arranged with the radial midline of the connecting tube 21 as the axis of symmetry, and a cavity for inserting the movable end ear of the single leaf spring is formed between the first connecting arm 22 and the second connecting arm 23.

[0025] Combination Figure 1 and Figure 2 As shown, the process of installing the leaf spring movable end bracket assembly of this embodiment is, first, fix the bracket body 11 of the ear end bracket 1 on the frame 7, then install the connecting tube 21 of the ear 2 between the first pin hole seat 12 and the second pin hole seat 13 of the ear end bracket 1, insert the ear pin 6 into the first pin hole seat 12, the connecting tube 21 and the second pin hole seat 13, connect the ear 2 to the ear end bracket 1 through the ear pin 6, but when the lower end of the ear 2 is not restricted, the ear 2 can rotate around the ear pin 6, finally place the movable end coil ear 31 of the single leaf spring 3 between the first connecting arm 22 and the second connecting arm 23 of the ear 2, and connect the movable end of the single leaf spring to the ear 2 through the leaf spring pin 4.

[0026] Combination Figure 5As shown, when the front section (the side close to the fixed end bracket 8) of the single leaf spring 3 breaks, the rear section of the single leaf spring 3 and the front axle 9 move backwards, driving the lifting eye 2 to rotate outward around the lifting eye pin 6. When the first connecting arm 22 and the second connecting arm 23 of the lifting eye 2 touch the limiting portions 5c of the first limiting block 51 and the second limiting block 52 respectively, the lifting eye 2 is restricted from further rotation, thereby avoiding interference with the front wheel steering system.

[0027] Compared with the existing leaf spring movable end bracket assembly, the leaf spring movable end bracket assembly of this embodiment has the following advantages:

[0028] (1) When the front half of the leaf spring breaks, the leaf spring movable end bracket assembly of this embodiment can limit the rearward displacement of the leaf spring through the limit block to prevent the leaf spring from interfering with the front wheel steering system.

[0029] (2) The leaf spring movable end bracket assembly of this embodiment has strong adaptability. It only needs to install the limit block to the existing lifting ear end bracket, and there is no need to replace the entire lifting ear end bracket, so the replacement cost is low.

[0030] (3) For light trucks and medium and heavy trucks, the cost and weight can be controlled by properly selecting the number of limit blocks.

[0031] The above-mentioned embodiment only expresses one implementation mode of the present invention, and its description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. A single leaf spring suspension system, characterized in that: The vehicle comprises a leaf spring movable end bracket assembly, a fixed end bracket (8), a single leaf spring (3), a front axle (9) and a vehicle frame (7), wherein the fixed end ear of the single leaf spring (3) is connected to the fixed end bracket (8), the movable end ear of the single leaf spring (3) is connected to the lifting ear (2) of the leaf spring movable end bracket assembly, and the middle part of the single leaf spring (3) is connected to the front axle (9); The leaf spring movable end bracket assembly comprises a lifting ear end bracket (1), a lifting ear (2), a lifting ear pin (6), and a leaf spring pin (4); the upper end of the lifting ear (2) is connected to the lifting ear end bracket (1) via the lifting ear pin (6); the lower end of the lifting ear (2) is provided with a cavity for receiving the leaf spring movable end ear and a through hole for the leaf spring pin (4) to pass through; the leaf spring movable end bracket assembly also comprises a limit block (5) for preventing the lifting ear (2) from rotating outwards; the limit block comprises a fixing portion (5a) and a limit portion (5c); the fixing portion (5a) is fixed to the lifting ear end bracket (1) via bolts; the limit portion (5c) is arranged on the outside of the lifting ear (2); The lifting ear end bracket (1) comprises a bracket body (11) and a first pin hole seat (12) and a second pin hole seat (13) arranged at the lower end of the bracket body (11); the lifting ear (2) comprises a first connecting arm (22) and a second connecting arm (23); the upper end of the first connecting arm (22) is connected to the first pin hole seat (12) via a lifting ear pin shaft (6), and the lower end of the first connecting arm (22) is provided with a through hole for the leaf spring pin shaft (4) to penetrate; the upper end of the second connecting arm (23) is connected to the second pin hole seat (13) via the lifting ear pin shaft (6), and the lower end of the second connecting arm is provided with a through hole for the leaf spring pin shaft (4) to penetrate; a cavity for placing the leaf spring movable end ear is formed between the first connecting arm (22) and the second connecting arm (23); The first connecting arm (22) comprises a first upper side wall section (22a), a first lower side wall section (22c), and a first curved side wall section (22b) connecting the first upper side wall section (22a) and the first lower side wall section (22c), the first upper side wall section (22a) being in contact with the inner wall surface of the first pin hole seat (12), and the first lower side wall section (22c) being located directly below the first pin hole seat (12); the second connecting arm (23) comprises a second upper side wall section (23a), a second lower side wall section (23c), and a second curved side wall section (23b) connecting the second upper side wall section (23a) and the second lower side wall section (23c), the second upper side wall section (23a) being in contact with the inner wall surface of the second pin hole seat (13), and the second lower side wall section (23c) being located directly below the second pin hole seat (13); The lifting ear (2) further comprises a connecting tube (21), wherein a lifting ear pin hole is formed in the connecting tube (21) along its axial direction and penetrating the entire connecting tube (21), the first connecting arm (22) is formed by extending downward from the outer end surface of the connecting tube (21), the second connecting arm (23) is formed by extending downward from the inner end surface of the connecting tube (21), and the first connecting arm (22) and the second connecting arm (23) are symmetrically arranged with the radial center line of the connecting tube (21) as the symmetry axis; The limit block (5) is provided with a total of one piece, the limit portion (5c) of the limit block is formed by extending obliquely downward along the lower edge of the fixing portion (5a), the included angle between the fixing portion (5a) and the limit portion (5c) is 140°-170°, the fixing portion (5a) is fixed to the outer side wall of the first pin hole seat (12) by means of bolts, and the limit portion (5c) of the limit block (5) is located on the outer side of the first lower side wall section (22c) of the first connecting arm (22).

2. The single leaf spring suspension system according to claim 1, characterized in that: The limit block (5) in the leaf spring movable end bracket assembly is provided with two blocks, namely a first limit block (51) and a second limit block (52); the limit portion (5c) of the first limit block (51) is formed by extending obliquely downward along the lower edge of the fixed portion (5a); the included angle between the fixed portion (5a) and the limit portion (5c) is 140° to 170°; the first limit block (51) and the second limit block (52) have the same structure; the first limit block (5 The fixing portion (5a) of the first limiting block (51) is fixed to the outer wall of the first pin hole seat (12) by means of bolts, and the limiting portion (5c) of the first limiting block (51) is located on the outer side of the first lower side wall section (22c) of the first connecting arm (22); the fixing portion (5a) of the second limiting block (52) is fixed to the outer wall of the second pin hole seat (13) by means of bolts, and the limiting portion (5c) of the second limiting block (52) is located on the outer side of the lower end of the second connecting arm (23).

3. The single leaf spring suspension system according to claim 2, characterized in that: Buffer pads (5d) are provided on the inner side walls of the first limiting block (51) and the second limiting block (52).

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