阅读说明：本技术 一种非对称下卷式卷耳变截面前钢板弹簧 (Asymmetric lower-rolling type lug variable-section front steel plate spring ) 是由 曾迥立 陈刚 于根稳 尹思维 李元杰 余平兰 宋盛华 杨超起 白清慧 欧阳萌 冯 于 2020-07-06 设计创作，主要内容包括：一种非对称下卷式卷耳变截面前钢板弹簧,包括通过中心螺栓连为一体的多片簧片,簧片以中心螺栓的轴线为界,分为前段部分和后段部分,前段部分的弧长大于后段部分的弧长,前段部分的弧高大于后段部分的弧高,前段部分、后段部分均包括根部段与变截面部分,根部段为平直段且等厚,前段部分的根部段的长度大于后段部分的根部段的长度,前段部分的变截面部分的厚度大于等于后段部分的变截面部分的厚度,前段部分的变截面部分的长度大于等于后段部分的变截面部分的长度,第一片簧片的两端均设置有下卷式卷耳。本设计不仅能减小转向直拉杆与钢板弹簧的运动不协调量,而且能保证制动时前段S变形和主销后倾角随载荷变化在可控范围。(The utility model provides a leaf spring before asymmetric formula of rolling up under lug variable cross section, include the multi-disc reed that links as an organic whole through central bolt, the reed uses central bolt's axis as the border, divide into anterior segment part and back end part, the arc length of anterior segment part is greater than the arc length of back end part, the arc height of anterior segment part is greater than the arc height of back end part, the anterior segment part, back end part all includes root section and variable cross section part, the root section is straight section and uniform thickness, the length of the root section of anterior segment part is greater than the length of the root section of back end part, the thickness of the variable cross section part of anterior segment part is greater than or equal to the thickness of the variable cross section part of back end part, the length of the variable cross section part of anterior segment part is greater than or equal to the length of the variable cross section part of back end part, the both ends of first leaf reed all. The design can not only reduce the movement non-coordination amount of the steering drag link and the steel plate spring, but also ensure that the deformation of the front section S and the caster angle of the kingpin are in a controllable range along with the load change during braking.)

1. The utility model provides a leaf spring before asymmetric formula of rolling up book ear variable cross section, includes from the top down and superposes the multi-disc reed that sets up in proper order, and central bolt (4) are connected with central nut (5) after passing the multi-disc reed in proper order, its characterized in that:

the reed is divided into a front section part and a rear section part by taking the axis of the central bolt (4) as a boundary, and the arc length S of the front section part₁Greater than the arc length S of the posterior segment₂The arc height of the front section part is larger than that of the rear section part, and the first leaf spring (1)Both ends are provided with a rolling lug (11), and the rolling lug (11) is of a down-rolling structure.

2. The asymmetric roll-down lug front leaf spring according to claim 1, wherein:

the front section part and the rear section part respectively comprise a root section and a variable cross-section part;

the root section of the front section part and the root section of the rear section part are respectively positioned at two sides of the central bolt (4), the root sections are straight sections, and the thickness of the root section of the front section part is equal to that of the root section of the rear section part;

the variable cross-section parts of the front section part and the rear section part are positioned between the root sections of the front section part and the rear section part and the end parts of the front section part and the rear section part, and the thickness of the variable cross-section part of the front section part is greater than or equal to that of the variable cross-section part of the rear section part.

3. The asymmetric roll-down lug front leaf spring according to claim 2, wherein:

a length L of a root section of the front section part₁A length L of the root section greater than the rear section portion₂；

The length (S) of the variable cross-section portion of the front section portion₁-L₁-L₃) Greater than or equal to the length (S) of the variable cross-section part of the rear section part₂-L₂-L₃)。

4. The asymmetric roll-down lug front leaf spring according to any one of claims 1-3, wherein:

both ends of the second reed (2) are provided with the ear wraps (21), and the ear wraps (21) are respectively wrapped outside the rolling ears (11) at both ends of the first reed (1).

5. The asymmetric roll-down lug front leaf spring according to any one of claims 1-3, wherein:

the length of the last reed (3) is less than that of the first reed (1).

6. The asymmetric roll-down lug front leaf spring according to any one of claims 1-3, wherein:

a base plate (6) is arranged between the roots of the two adjacent reeds;

a base plate (6) is arranged between the root part of the first reed (1) and the central nut (5);

a base plate (6) is arranged between the root of the last reed (3) and the head of the central bolt (4).

7. The asymmetric roll-down lug front leaf spring according to any one of claims 1-3, wherein:

and a noise reduction pad (7) is arranged between the end parts of the two adjacent reeds.

Technical Field

The invention relates to an automobile steel plate spring, in particular to an asymmetric downward-rolling type lug-rolling variable-section front steel plate spring which is mainly suitable for reducing the movement incongruity of a steering drag link and the steel plate spring and ensuring that the front end S deformation and the kingpin caster angle are changed in a controllable range along with the load during braking.

Background

At present, the front suspension steel plate springs of the automobile are all equal in front-rear length, the equivalent rod radius R is short for the shorter steel plate spring, the curvature radius of an arc aa 'formed by OA equal to the equivalent rod radius R is small, and the equivalent rod radius R is equal to the curvature radius of an arc bb' (the length of a steering straight pull rod is taken as the radius O)₂The arc formed by drawing a circle) will be larger, and the amount of movement incoordination (interference) will be larger, see fig. 1 in particular.

Disclosure of Invention

The invention aims to overcome the defect and the problem of large movement incoordination amount in the prior art, and provides an asymmetric roll-down lug variable-section front steel plate spring with small movement incoordination amount.

In order to achieve the above purpose, the technical solution of the invention is as follows: an asymmetric lower-rolling type lug-rolling variable-section front steel plate spring comprises a plurality of reeds which are sequentially overlapped from top to bottom, and a central bolt sequentially penetrates through the plurality of reeds and then is connected with a central nut;

the reed is divided into a front section part and a rear section part by taking the axis of the central bolt as a boundary, and the arc length S of the front section part₁Greater than the arc length S of the posterior segment₂The arc height of the front section part is larger than that of the rear section part, two ends of the first reed are provided with rolling lugs, and the rolling lugs are of a downward rolling structure.

The front section part and the rear section part respectively comprise a root section and a variable cross-section part;

the root section of the front section part and the root section of the rear section part are respectively positioned at two sides of the central bolt, the root sections are straight sections, and the thickness of the root section of the front section part is equal to that of the root section of the rear section part;

the variable cross-section parts of the front section part and the rear section part are positioned between the root sections of the front section part and the rear section part and the end parts of the front section part and the rear section part, and the thickness of the variable cross-section part of the front section part is greater than or equal to that of the variable cross-section part of the rear section part.

A length L of a root section of the front section part₁A length L of the root section greater than the rear section portion₂；

The length (S) of the variable cross-section portion of the front section portion₁-L₁-L₃) Greater than or equal to the length (S) of the variable cross-section part of the rear section part₂-L₂-L₃)。

Both ends of the second reed are provided with the lug, and the lugs are respectively coated outside the rolling lugs at both ends of the first reed.

The length of the last reed is less than that of the first reed.

A base plate is arranged between the roots of the two adjacent reeds;

a base plate is arranged between the root of the first reed and the central nut;

a base plate is arranged between the root of the last reed and the head of the central bolt.

And a noise reduction pad is arranged between the end parts of the two adjacent reeds.

Compared with the prior art, the invention has the beneficial effects that:

1. the invention relates to a reed of an asymmetric roll-down type lug variable-section front steel plate spring, which is divided into a front section part and a rear section part by taking the axis of a central bolt as a boundary, wherein the arc length S of the front section part₁Greater than the arc length S of the posterior segment₂The arc height of the front section part is greater than that of the rear section part, both ends of the first reed are provided with rolling ears, and the rolling ears are of a downward rolling structure; the design can increase the length of the equivalent rod, so that the curvature radius of the arc aa ' is increased, and the distance between the arc aa ' and the arc bb ' is reduced, thereby reducing the movement noncoordination amount of the steering drag link and the steel plate spring. Therefore, the invention can reduce the movement mismatch of the steering drag link and the steel plate spring.

2. The root section of the asymmetric lower-rolling type lug-rolling variable-section front steel plate spring is a straight section, the thickness of the root section of the front section part is equal to that of the root section of the rear section part, and the length L of the root section of the front section part₁A length L of the root section greater than the rear section portion₂The thickness of the variable cross section part of the front section part is larger than or equal to the thickness of the variable cross section part of the rear section part, and the length (S) of the variable cross section part of the front section part₁-L₁-L₃) Greater than or equal to the length (S) of the variable cross-section part of the rear section part₂-L₂-L₃) The design is used for reducing the asymmetry of the rigidity of the front section and the rear section, and preventing the deformation of the front section S from becoming larger and the caster angle of the kingpin from increasing along with the change of the load during braking. Therefore, the invention can ensure that the deformation of the front section S and the caster angle of the kingpin are in a controllable range along with the change of the load during braking.

3. According to the asymmetric roll-down lug variable-section front steel plate spring, the base plate is arranged between the roots of two adjacent reed plates, the base plate is arranged between the root of the first reed plate and the central nut, the base plate is arranged between the root of the last reed plate and the head of the central bolt, and the base plate is arranged to reduce friction; and a noise reduction pad is arranged between the end parts of the two adjacent reeds to play a role in noise reduction. Therefore, the invention has long service life and good noise reduction effect.

Drawings

Fig. 1 is a schematic layout of a plate spring in the automobile industry at present.

Fig. 2 is a schematic structural diagram of the present invention.

Fig. 3 is a schematic view of the structure of the present invention flattened out.

Fig. 4 is a schematic illustration of an implementation of the present invention.

In the figure: the spring comprises a first reed 1, a rolling lug 11, a second reed 2, a wrapping lug 21, a last reed 3, a center bolt 4, a center nut 5, a base plate 6, a noise reduction pad 7, a first sheet 8 of an existing front steel plate spring, wheels 9 and a base line 10.

Detailed Description

The present invention will be described in further detail with reference to the following description and embodiments in conjunction with the accompanying drawings.

Referring to fig. 2 to 4, the asymmetric downward-rolling type lug-rolling variable-section front steel plate spring comprises a plurality of reeds which are sequentially overlapped from top to bottom, and a central bolt 4 sequentially penetrates through the plurality of reeds and then is connected with a central nut 5;

the reed is divided into a front section part and a rear section part by taking the axis of the central bolt 4 as a boundary, and the arc length S of the front section part₁Greater than the arc length S of the posterior segment₂The arc height of the front section part is larger than that of the rear section part, both ends of the first reed 1 are provided with rolling ears 11, and the rolling ears 11 are of a downward rolling structure.

The front section part and the rear section part respectively comprise a root section and a variable cross-section part;

the root section of the front section part and the root section of the rear section part are respectively positioned at two sides of the central bolt 4, the root sections are straight sections, and the thickness of the root section of the front section part is equal to that of the root section of the rear section part;

the variable cross-section parts of the front section part and the rear section part are positioned between the root sections of the front section part and the rear section part and the end parts of the front section part and the rear section part, and the thickness of the variable cross-section part of the front section part is greater than or equal to that of the variable cross-section part of the rear section part.

A length L of a root section of the front section part₁A length L of the root section greater than the rear section portion₂；

The length (S) of the variable cross-section portion of the front section portion₁-L₁-L₃) Greater than or equal to the length (S) of the variable cross-section part of the rear section part₂-L₂-L₃)。

Both ends of the second reed 2 are provided with a lug 21, and the lugs 21 are respectively coated outside the rolling lugs 11 at both ends of the first reed 1.

The length of the last reed 3 is less than that of the first reed 1.

A base plate 6 is arranged between the roots of the two adjacent reeds;

a base plate 6 is arranged between the root part of the first reed 1 and the central nut 5;

a backing plate 6 is arranged between the root of the last reed 3 and the head of the central bolt 4.

And a noise reduction pad 7 is arranged between the end parts of the two adjacent reeds.

The principle of the invention is illustrated as follows:

the design relates to a roll-down type rolling lug variable-section front suspension steel plate spring with asymmetric unequal arc heights of front length and rear length, the arc length of the front section of each leaf spring of the steel plate spring is greater than that of the rear section, the arc height of the front section is greater than that of the rear section, and the rolling lugs at two ends of a first leaf spring are of a roll-down type structure; the root section of each leaf spring piece is equal in thickness, the length of the front section is also larger than that of the rear section, a variable cross section part is arranged between the end part and the root section, and the thickness of the variable cross section part of the front section is not smaller than that of the variable cross section part of the rear section. The design can effectively reduce the movement incoordination (interference) amount of the steering drag link and the steel plate spring, and ensure that the deformation of the front section S and the caster angle of the kingpin are in a controllable range along with the load change during braking.

Front arc length S₁Greater than the arc length S of the rear section₂Can increase the equivalent rod length (i.e. R)₁>R), the curvature radius of the arc aa ' is enlarged, the distance between the arc aa ' and the arc bb ' is reduced, namely, the movement incoordination (interference) amount of the steering straight pull rod and the steel plate spring is reduced, but the movement incoordination (interference) amount cannot be achieved only by a limited increase equivalent rod due to the limitation of arrangement spaceThe target of the given interference amount is obtained by combining a coil spring eye downward-winding structure of the steel plate spring so that the swing center O of the equivalent rod₁And the arc aa ' is changed in angle by moving downwards (from the base line to the position below the base line), so that the distance between the arc aa ' and the arc bb ' is further reduced, and the aim of reducing the movement incoordination (interference) amount of the steering straight pull rod and the steel plate spring is fulfilled.

The asymmetric structure that the front steel plate spring is long in front and short in back can enable the rigidity of the front section to be smaller than that of the rear section (note: the rigidity is inversely proportional to the cube of the length), so that the deformation of the front section S is increased and the caster angle of a kingpin is increased along with the change of load during braking; in order to reduce the asymmetry of the rigidity of the front section and the rear section, the equal-thickness part of the root part is designed into a straight section, the front section is long and the rear section is short, and the gradually-changed section part of the front section is designed to be slightly thicker than that of the rear section (note: the rigidity is in direct proportion to the cube of the thickness).

The front section arc height (note: the arc height refers to the vertical distance from the center of the lug to the upper surface of the root part of the first reed) is larger than the rear section arc height, and the problem that the caster angle of the main pin is increased along with the change of the load can be solved. The description is as follows: the kingpin caster angle is a projection of an included angle of a wheel swing axis to the ground on a longitudinal plane of a whole vehicle and is formed by superposing three parts, wherein the first part is an angle of a diagonal backing plate between a steel plate spring and a front bridge spring seat and is recorded as angle 1, the second part is an included angle of a first reed root plane of the steel plate spring relative to an upper plane of the frame and is recorded as angle 2, the third part is an included angle of the upper plane of the frame and the ground and is recorded as angle 3, and finally, a kingpin caster angle (angle 1 plus angle 2 minus 3) is formed. The arc height of the front section of the steel plate spring is larger than that of the rear section, so that the angle 1 is larger than that of the equal arc height, the angle 3 is the largest when the vehicle is empty, the vehicle-mounted load is increased, and the angle 1 and the angle 3 are both reduced. Thus, the variation sensitivity of the kingpin caster angle (angle 1 plus angle 2-3) is reduced.

The front suspension leaf spring may have a plurality of leaves, which are only schematically shown in fig. 2 and 3.