Front damping piston assembly of automobile damper

Abstract

The utility model discloses a front damping piston assembly of an automobile shock absorber. The front damping piston assembly comprises a piston body A, a piston body B and a piston body C which are assembled into a whole in a matched mode. The piston body A, the piston body B and the piston body C are all integral parts which are formed by die-casting an iron-based powder metallurgy material by adopting a high-pressure die-casting process; the piston body B is positioned and pressed in a combined cavity formed by the piston body A through the piston body C, and the outer circumferential surface of the piston body C is tightly matched with the inner wall of a cavity opening of the combined cavity of the piston body A; and coaxial through central piston rod holes are formed in the piston body A, the piston body B and the piston body C. The high-pressure die-casting forming is adopted, the size is stable, the manufacturing cost is low, and the matching precision is high.

Description

Technical Field

[0001] The utility model relates to the technical field of automotive shock absorbers, and particularly to a combined piston applied to the shock absorber of BYD SG models, specifically a front shock piston assembly of an automotive shock absorber. Background Art

[0002] An automotive shock absorber is an important component installed on an automobile to reduce the vibration of the vehicle frame. An automotive shock absorber usually consists of an oil cylinder, a piston, a piston rod, and a spring. In the prior art, the front shock piston of the shock absorber is made of steel by machining processes. This kind of front shock piston has many processing procedures, low production efficiency, high processing costs, and relatively poor dimensional stability. Summary of the Invention

[0003] The technical problem to be solved by the utility model is to provide a front shock piston assembly of an automotive shock absorber with high assembly accuracy, low manufacturing cost, stable dimensions, and formed by die-casting process, aiming at the above-mentioned prior art status.

[0004] The technical solution adopted by the utility model to solve the above technical problem is as follows:

[0005] A front shock piston assembly of an automotive shock absorber includes an A piston body, a B piston body, and a C piston body that are assembled together as a whole; the A piston body, the B piston body, and the C piston body are all integral parts formed by die-casting a ferrous metal powder material using a high-pressure die-casting process; the B piston body is press-fitted into the combined cavity formed in the A piston body through positioning by the C piston body, and the outer circumferential surface of the C piston body is closely fitted with the inner wall of the cavity opening of the A piston body's combined cavity; the A piston body, the B piston body, and the C piston body are formed with a coaxial and through central piston rod hole.

[0006] To optimize the above technical solution, the measures taken also include:

[0007] Six support platforms are formed on the bottom surface of the combined cavity with equal radian, and an opening groove cavity with an opening pointing to the axis of the central piston rod hole is formed between two adjacent support platforms. The right end annular surface of the B piston body is press-fitted and supported on the support platform of the A piston body.

[0008] A ring groove with a depth of 0.5 mm is formed around the central piston rod hole on the top surface of the A piston body, and six through oil holes are machined with equal radian in the ring groove. The lower hole openings of the through oil holes exactly penetrate through the central position in the opening groove cavity.

[0009] In the above ring groove, a circular groove pit is formed on both sides of each through oil hole, and the circular groove pit is circumferentially spaced 18° from the adjacent through oil hole; the circumferential distance between two adjacent through oil holes is 60°.

[0010] Twelve circular through-holes are formed on the above-mentioned C piston body at equal arcs around the central piston rod hole, and the circumferential distance between two adjacent circular through-holes is 30°; the circumferential distance between the axis of the through-oil hole and the axis of the adjacent circular through-hole is 15°.

[0011] An annular groove is formed on the inner end surface of the above-mentioned C piston body around the central piston rod hole, and the circular through-holes penetrate through the annular groove.

[0012] The above-mentioned support table body is an isosceles trapezoid, and the included angle between the two waists of the support table body is 50°.

[0013] Compared with the prior art, the front shock absorber piston combination of the present utility model is assembled and constituted by an A piston body, a B piston body and a C piston body, and the A piston body, the B piston body and the C piston body are all integral parts die-cast by using a high-pressure die-casting process with an iron-based powder metallurgy material. The size of the die-cast workpiece is stable, the manufacturing cost is low, and the assembly accuracy is high. The B piston body is press-fitted into the combined cavity formed by the A piston body through the positioning of the C piston body, and the A piston body, the B piston body and the C piston body are formed with a coaxial and through central piston rod hole. The powder metallurgy density of the present utility model is ≥6.4 g / cm³, and the hardness is HRB40-75. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a three-dimensional sectional view structure diagram of the present utility model;

[0015] Figure 2 is a front view structure diagram of the present utility model;

[0016] Figure 3 is Figure 2 a half-sectional right view of

[0017] Figure 4 is Figure 2 a rear view of

[0018] Figure 5 is Figure 3 a sectional view taken along the line I-I in DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The following further describes the embodiments of the present utility model in detail with reference to the drawings.

[0020] Figures 1 to 5 is a structure diagram of the present utility model.

[0021] The reference numerals therein are: combined cavity Q, central piston rod hole K, A piston body 1, annular groove 1a, through-oil hole 1b, circular pit 1c, support table body 11, open slot cavity 12, B piston body 2, C piston body 3, annular groove 3a, circular through-hole 3b.

[0022] As Figures 1 to 5As shown, the present utility model discloses a front shock absorber piston assembly for an automobile. This front shock absorber piston assembly is applied to the shock absorber of BYD SG model and is assembled by mating three components, namely piston body A 1, piston body B 2, and piston body C 3. Each of the three components, piston body A 1, piston body B 2, and piston body C 3, is an integral part formed by die-casting iron-based powder metallurgy materials using the high-pressure die-casting process. The workpieces formed by the piston body A 1, piston body B 2, and piston body C 3 using the die-casting process have stable dimensions and high assembly accuracy, and the cost of powder metallurgy is relatively low and it is easy to manufacture. Piston body A 1 has a cavity with a lower opening, which constitutes an assembly cavity Q for piston body B 2 and piston body C 3. Piston body B 2 is positioned and press-fitted into the assembly cavity Q formed in piston body A 1 through piston body C 3. The total height of piston body A 1 is 12 mm, the diameter is 30 mm, the diameter of assembly cavity Q is 27.6 mm, and the depth of assembly cavity Q is 9 mm. After piston body C 3 is assembled with piston body A 1, the outer circumferential surface of piston body C 3 closely fits with the inner wall of the cavity opening of assembly cavity Q of piston body A 1. Piston body A 1, piston body B 2, and piston body C 3 are formed with a coaxial and through central piston rod hole K, and the diameter of central piston rod hole K is 12 mm.

[0023] In the embodiment, it can be clearly seen from Figure 1 and Figure 5 that six support platforms 11 are formed on the bottom surface of the cavity of assembly cavity Q of the present utility model with equal radian. An opening groove cavity 12 with an opening pointing to the axis of central piston rod hole K is formed between two adjacent support platforms 11. There are also six opening groove cavities 12, and the circumferential distance between two adjacent opening groove cavities 12 is 60°. It can also be seen from Figure 5 that the cross-section of support platform 11 is in the shape of an isosceles trapezoid, the included angle between the two waists of support platform 11 is 50º, and the height of support platform 11 is 3.5 mm. The right-end annular surface of piston body B 2 of the present utility model is positioned and supported and press-fitted on support platform 11 of piston body A 1. Piston body B 2 is a ring body with an outer diameter of 18 mm and a thickness of 2.7 mm.

[0024] In the embodiment, as shown in Figure 2 and Figure 3 a circular groove 1a is formed around central piston rod hole K on the top surface of piston body A 1 of the present utility model. The depth of circular groove 1a is 0.5 mm, and six through oil holes 1b are processed with equal radian in circular groove 1a. It can be seen from Figure 5 that the lower orifice of through oil hole 1b just penetrates through the central position in opening groove cavity 12.

[0025] Please continue to refer to Figure 2, in the annular groove 1a of the present utility model, a circular pit 1c is formed on each side of each through oil hole 1b. The diameter of the circular pit 1c is 1.4 mm, and the diameter of the through oil hole 1b is 3 mm. The circular pit 1c is circumferentially spaced 18° from the adjacent through oil hole 1b; the circumferential distance between two adjacent through oil holes 1b is 60°. The center of each through oil hole 1b and the center of each circular pit 1c of the present utility model both fall on the circumference of a circle with a diameter of 21 mm.

[0026] In the embodiment, as Figure 1 and Figure 4 shown, twelve circular through holes 3b are formed equiangularly around the central piston rod hole K on the C piston body 3. The circumferential distance between two adjacent circular through holes 3b is 30°. The through oil hole 1b and the circular through hole 3b are exactly staggered in the circumferential direction, and the circumferential distance between the axis of the through oil hole 1b and the axis of the adjacent circular through hole 3b is 15°. The diameter of the circular through hole 3b of the present utility model is 3 mm, and the center of each circular through hole 3b falls on the circumference of a circle with a diameter of 20.5 mm.

[0027] In the embodiment, it can be seen from Figure 3 that a circular groove 3a is formed around the central piston rod hole K on the inner end face of the C piston body 3 of the present utility model, and the circular through hole 3b penetrates through the circular groove 3a.

[0028] The axial crushing strength of the front shock absorber piston assembly of the present utility model is greater than 20 KN, and the radial crushing strength is greater than 7.8 KN. The combination of the A piston body 1, the B piston body 2 and the C piston body 3 ensures no abnormal leakage points and the structure is stable without detachment.

[0029] The best embodiment of the present utility model has been illustrated, and various changes or modifications made by those of ordinary skill in the art will not depart from the scope of the present utility model.

Claims

1. A front shock piston assembly for an automotive shock absorber, comprising a piston body A (1), a piston body B (2) and a piston body C (3) which are assembled together as a whole; characterized in that: The described A piston body (1), B piston body (2) and C piston body (3) are all integral parts formed by die-casting with an iron-based powder metallurgy material using a high-pressure die-casting process; the B piston body (2) is positioned and press-fitted into the combined cavity (Q) formed in the A piston body (1) through the C piston body (3), and the outer circumferential surface of the C piston body (3) is closely fitted with the inner wall of the cavity opening of the combined cavity (Q) of the A piston body (1); the A piston body (1), B piston body (2) and C piston body (3) are formed with a coaxial and through central piston rod hole (K).

2. The front shock piston combination of an automotive shock absorber according to claim 1, characterized in that: Six support platforms (11) are formed on the cavity bottom surface of the combined cavity (Q) with equal radian, and an opening groove cavity (12) with an opening pointing to the axis of the central piston rod hole (K) is formed between two adjacent support platforms (11), and the right end annular surface of the B piston body (2) is positioned and supported and press-fitted on the support platform (11) of the A piston body (1).

3. The front shock piston combination of an automotive shock absorber according to claim 2, characterized in that: A ring groove (1a) with a depth of 0.5 mm is formed on the top surface of the A piston body (1) around the central piston rod hole (K), and six through oil holes (1b) are machined in the ring groove (1a) with equal radian, and the lower hole openings of the through oil holes (1b) just penetrate through the central position in the opening groove cavity (12).

4. The front shock piston assembly of an automotive shock absorber according to claim 3, characterized in that: A circular groove pit (1c) is formed on each side of each through oil hole (1b) in the ring groove (1a), and the circular groove pit (1c) is circumferentially spaced 18° from the adjacent through oil hole (1b); the circumferential distance between two adjacent through oil holes (1b) is 60°.

5. The front shock piston assembly of an automotive shock absorber according to claim 4, characterized in that: Twelve circular through holes (3b) are formed on the C piston body (3) around the central piston rod hole (K) with equal radian, and the circumferential distance between two adjacent circular through holes (3b) is 30°; the circumferential distance between the axis of the through oil hole (1b) and the axis of the adjacent circular through hole (3b) is 15°.

6. The front shock piston assembly of an automotive shock absorber according to claim 5, characterized in that: A ring groove (3a) is formed on the inner side end surface of the C piston body (3) around the central piston rod hole (K), and the circular through holes (3b) penetrate through the ring groove (3a).

7. The front shock piston combination of an automotive shock absorber according to claim 6, characterized in that: The support platform (11) is in the shape of an isosceles trapezoid, and the included angle between the two waists of the support platform (11) is 50°.

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