CN210284398U - Limiting and protecting device for rear suspension spring shock absorber of cab - Google Patents

Abstract

The utility model discloses a limiting protection device of a rear suspension spring damper of a cab, which comprises a frame mounting connecting plate, a rubber block, a spring damper and an upper connecting frame, wherein the upper part of the spring damper is hinged with the upper connecting frame assembly, the lower part of the spring damper is hinged with the frame mounting connecting plate, the rigidity of the spring damper is not more than 30N/mm, the upper connecting frame consists of a U-shaped connecting plate and a limiting rod, one end part of the U-shaped connecting plate is hinged with the limiting rod, the limiting rod is connected with the frame mounting connecting plate through the rubber block, the spring damper is hinged with the other end of the U-shaped connecting plate, the rubber block consists of a metal piece and a rubber pad, the metal piece and the rubber pad are fixed together through vulcanization treatment, and the rigidity of the rubber pad and the rigidity of the spring damper meet the condition that the rigidity of the rubber pad is not more than 3 and not more than 6, the utility model discloses a simple structure improves fatigue life, noise is little.

Description

Limiting and protecting device for rear suspension spring shock absorber of cab

Technical Field

The utility model relates to a spacing protection device of suspension spring damper behind driver's cabin belongs to motor vehicle technical field.

Background

At present, a turnover locking bracket installed in a rear suspension of a motor vehicle cab and a support frame hinged below the locking bracket are connected and fixed on a vehicle frame chassis. In order to relieve and reduce the bumping and shaking of the cab caused by the vehicle during running, a spring damper composed of a screw rod, a spring and a base is generally hinged below the locking bracket. Although the spring shock absorber mounted on the rear suspension can relieve and relieve the bumping shock generated in the driving process of a cab due to a vehicle, when the bumping shock has large amplitude and exceeds the stretching or compressing limit of the spring shock absorber, the spring of the spring shock absorber is broken and damaged or fails, so that the service life of the spring shock absorber is shortened, and the manpower, material resources and time for maintaining and replacing the spring shock absorber are increased.

The prior art discloses the application numbers as follows: 201620559550.0A limiting protection device for a rear spring shock absorber of a cab comprises a locking bracket, a spring shock absorber which is hinged below the locking bracket and consists of a screw rod, a spring and a base, and a support frame, wherein the upper end and the lower end of the spring shock absorber are respectively provided with an upper limiting frame and a lower limiting frame, and the upper limiting frame and the lower limiting frame are correspondingly provided with an upper rubber pad and a lower rubber pad; the lower limiting frame arranged at the lower end of the spring shock absorber is fixedly connected on the support frame through a bolt, the upper rubber pad arranged in the upper limiting frame at the upper end of the spring shock absorber is arranged below the upper plane of the support frame, and the distance between the upper rubber pad and the upper plane baffle of the support frame is within the allowable stress stroke range of the stretching of the spring shock absorber. However, since the compression strength of the conventional spring damper is often satisfactory, the spring damper is stretched when the amplitude of the jounce vibration is large, which causes breakage of the spring damper, a poor fatigue life, and a large noise. Therefore, the related art is complicated in structure.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that will solve is: the limiting protection device for the rear spring shock absorber of the cab aims to overcome the defect that the structure of the prior art is complex, and can effectively protect the spring shock absorber.

The technical scheme is as follows: a limiting protection device for a rear suspension spring shock absorber of a cab comprises a frame mounting connection plate, a rubber block, a spring shock absorber and an upper connection frame. The upper portion of the spring shock absorber is hinged to the upper connecting frame assembly, the lower portion of the spring shock absorber is hinged to the vehicle frame mounting connecting plate, the rigidity of the selected spring shock absorber is not larger than 30N/mm, the upper connecting frame is composed of a U-shaped connecting plate and a limiting rod, one end portion of the U-shaped connecting plate is hinged to the limiting rod, the limiting rod is connected with the vehicle frame mounting connecting plate through the rubber block, the spring shock absorber is hinged to the other end of the U-shaped connecting plate, the rubber block is composed of a metal piece and a rubber pad, the metal piece and the rubber pad are fixed together through vulcanization, and the rigidity of the rubber pad block and the rigidity of the spring shock absorber meet the condition that the rigidity of the rubber pad block is not less than 3 and not more than 6.

The installation process of the limiting protection device of the rear suspension spring shock absorber of the cab is as follows: the spring damper is subjected to pressure, the spring damper is installed and connected with the upper connecting frame assembly, the rubber block and the frame installation connecting plate under the condition that certain deformation is generated, so that the rubber block can generate limited deformation in the deformation recovery process of the spring damper, the spring damper is limited to stretch by the connection relation between the upper connecting frame assembly and the spring damper, a balance state is finally achieved, the damper is still in a compression state under the balance state, the size of the spring damper under the state is called as a size of the balance state, the length of the spring damper under the action of no external force is called as a free length, and the maximum deformation of the rubber block meets the condition: the maximum deformation is less than or equal to the free length-the equilibrium state length.

The rubber block can be made to have a rigidity reduced and a structure NVH reduced through a decoupling hole structure under the condition that the hardness of the rubber block is not changed.

Preferably, the decoupling hole structure on the rubber block consists of hole structures which are symmetrical left and right and have diameters which are sequentially reduced from top to bottom, and hole structures which have diameters which are sequentially increased from top to bottom in the middle.

The beneficial effects are as follows: 1. with the bumper shock absorber as supporting function spare, relative rubber axle sleeve structure possess bigger degree of freedom of movement, and respond more rapidly for it possesses better vibrations decay effect, has better later maintenance nature.

2. The shock absorber is in a compression state, the compression deformation size needs to be slightly larger than the maximum deformation size of the rubber, and the purpose is to ensure that the shock absorber is always in the compression state in the movement process, so that the service life of the shock absorber can be ensured.

3. Carry out configuration optimization to last spacing block rubber, because too big block rubber rigidity can cause to beat the pause when spacing and frustrate and feel, influence the travelling comfort, but the undersize rigidity will influence rubber hardness again for rubber life reduces. The decoupling hole structure is added, the rigidity of the rubber block is reduced under the condition that the hardness of the rubber block is unchanged, the comfort is improved, and the NVH of the structure is reduced.

4. Compared with the existing structure, the later maintenance cost is lower, and the disassembly and assembly are more convenient.

Drawings

Fig. 1(a) and (b) are schematic structural diagrams of the present invention.

Fig. 2 is a schematic diagram of the rubber block structure of the present invention.

Fig. 3 is a schematic view of the upper connection bracket of the present invention.

In the figure: 1: a connecting plate is arranged on the frame; 2: a rubber block; 3: a spring damper; 4: a limiting frame; 5: a metal member; 6: a rubber pad; 7: a limiting rod; 8: u-shaped connecting plate.

Detailed Description

The structure of the utility model is explained in detail with the attached drawings as follows:

as shown in fig. 1(a), 1(b), 2 and 3, the limiting protection device for the rear suspension spring shock absorber of the cab comprises a frame mounting connection plate 1, a rubber block 2, a spring shock absorber 3 and a limiting frame 4. The upper end of the spring shock absorber 3 is fixedly connected with a limiting frame 4, the lower end of the spring shock absorber 3 is fixedly connected with the frame mounting connecting plate 1, the limiting frame 4 is fixedly connected with the rubber block 2, the rigidity of the spring shock absorber 3 is not more than 30N/mm, the upper connecting frame 4 consists of a U-shaped connecting plate 8 and a limiting rod 9, the U-shaped connecting plate 8 is hinged with the limiting rod 9 by one end part, the limiting rod 9 is connected with the frame mounting connecting plate 1 through the rubber block 2, the spring shock absorber 3 is hinged with the other end of the U-shaped connecting plate 8, the rubber block 2 consists of a metal piece 5 and a rubber pad 6, the metal piece 5 and the rubber pad 6 are fixed together through vulcanization treatment, and the rigidity of the rubber cushion block and the rigidity of the spring damper meet the conditions that: and 3 is not less than the spring damper and not more than 6 is not less than the rubber cushion block.

The installation process of the limiting protection device of the rear suspension spring shock absorber of the cab is as follows: the spring damper 3 is pressurized, the spring damper 3 is installed and connected with the upper connecting frame assembly 4, the rubber block 2 and the frame installation connecting plate 1 under the condition that certain deformation is generated, so that the rubber block 2 can generate limited deformation when the spring damper 3 recovers the deformation process, the spring damper 3 is limited to stretch by the connection relation between the upper connecting frame assembly 4 and the spring damper 3, a balance state is finally achieved, the size of the spring damper in the state is called as the size of the balance state, and the damper is still in a compression state under the balance state. The length of the spring damper 3 when not subjected to an external force is referred to as a free length. The maximum deformation of the rubber block 2 meets the condition: the maximum deformation is less than or equal to the free length-the equilibrium state length.

3 rows of decoupling holes are distributed on the rubber block 2, wherein the middle row is in a 4-row hole structure, the diameter of the holes is reduced from top to bottom in sequence

The distance is 7mm, the left and right rows are in a 3-row hole structure, the hole diameters are sequentially increased from top to bottom, namely

The distance is 10mm, so that the rigidity of the rubber block 2 is reduced under the condition of unchanged hardness, and the structure is reducedNVH。

Claims (3)

1. A limiting protection device for a rear suspension spring shock absorber of a cab comprises a frame mounting connection plate (1), a rubber block (2), a spring shock absorber (3) and an upper connection frame (4), and is characterized in that the upper part of the spring shock absorber (3) is hinged with the upper connection frame (4), the lower part of the spring shock absorber (3) is hinged with the frame mounting connection plate (1), and the rigidity of the spring shock absorber (3) is not more than 30N/mm; the upper connecting frame (4) is composed of a U-shaped connecting plate (8) and a limiting rod (7), one end of the U-shaped connecting plate (8) is hinged to the limiting rod (7), the limiting rod (7) is connected with the frame mounting connecting plate (1) through the rubber block (2), the spring damper (3) is hinged to the other end of the U-shaped connecting plate (8), the rubber block (2) is composed of a metal piece (5) and a rubber pad (6), the metal piece (5) and the rubber pad (6) are fixed together through vulcanization, and the rigidity of the rubber block (2) and the rigidity of the spring damper (3) meet the condition that the spring damper is not less than 3 and not more than 6.

2. A cab rear suspension spring absorber limit protector as claimed in claim 1 in which the maximum amount of deformation of the rubber block (2) meets the condition: the maximum deformation is less than or equal to the free length-the equilibrium state length.

3. The limiting protection device of the rear suspension spring shock absorber of the cab as claimed in claim 2, wherein the decoupling hole structure on the metal piece (5) is composed of a hole structure which is symmetrical left and right and has sequentially decreasing diameters from top to bottom and a hole structure which has sequentially increasing diameters from top to bottom.

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