shock absorber

Abstract

The utility model relates to the technical field of shock absorber. The shock absorber includes cylinder, piston rod, upper hanging ear, sheath and locking nut, the upper end of piston rod has external thread, locking nut is screwed through external thread in the upper end of piston rod, the outside of cylinder and piston rod is sheathed in sheath, locking nut is located below the end cap portion of sheath, upper hanging ear is screwed in the upper end of piston rod through the threaded hole, upper hanging ear is located above end cap portion, and upper hanging ear and locking nut cooperate and clamp the sheath fixed on piston rod. Advantageous effects are: can first high temperature baking paint and then carry out the assembly of oil seal, thereby eliminating oil seal because of high temperature baking high temperature and damage, leading to oil leakage;The design of locking nut makes the shock absorber not damage oil seal when compressed to the limit;The installation space between the lifting ring and the sheath is increased by the high neck;The sheath can be stretch formed at one time, and the wall thickness can be appropriately thinned, when the sheath is deformed, the coaxiality of the sheath and the shock absorber main body can be corrected more easily.

Description

Technical Field

[0001] This utility model relates to the field of shock absorber technology. Background Technology

[0002] like Figure 1 As shown, the existing shock absorber includes a shock absorber body, an upper lifting ring 6, and a protective sleeve 4. The shock absorber body includes a cylinder 1, a piston rod 2, a piston, a guide sleeve 7, and an oil seal 8. The piston, guide sleeve 7, and oil seal 8 are located inside the cylinder 1. The lower end of the cylinder 1 is closed, and the upper end of the cylinder 1 is sealed by the oil seal 8. The oil seal 8 and the guide sleeve 7 are press-fitted. The lower end of the piston rod 2 passes through the oil seal 8 and the guide sleeve 7 and extends into the cylinder 1. The piston is installed at the lower end of the piston rod 2, and the guide sleeve 7 is located below the oil seal 8.

[0003] The sheath 4 is for decoration and protection of the shock absorber body. The sheath 4 includes a cylindrical body 4-1 and an end cap 4-2 at the upper end of the cylindrical body 4-1. The end cap 4-2 is fitted into the upper end hole of the cylindrical body 4-1. The cap ring of the end cap 4-2 is welded to the outer side of the cylindrical body 4-1. The upper lifting ring 6 is welded to the center of the front side of the end cap 4-2, and the piston rod is welded to the center of the back side of the end cap 4-2. A lower lifting ring is welded to the lower end of the cylinder 1 of the shock absorber body. Figure 1 The black-filled area in the image represents the welding area.

[0004] The welding steps are as follows: first, weld the end cap 4-2 to the upper lifting ring 6, then weld the end cap 4-2 to the piston rod 2, and then weld the cylinder 4-1 to the end cap 4-2.

[0005] The exterior of the shock absorber also requires high-temperature baking paint treatment to improve its corrosion resistance and aesthetics. However, because the sheath 4 and the shock absorber body are welded together to form a non-removable whole, and the welding process would damage the surface paint, high-temperature baking paint can only be applied after welding is completed.

[0006] Existing shock absorbers have many problems during use. For example:

[0007] 1. The high-temperature baking of high-temperature paint can cause the rubber oil seal 8 to age, affecting its lifespan, or even directly damaging the oil seal 8, causing the oil seal 8 of the shock absorber to burst open and leak oil, resulting in scrap. In actual production, scrap caused by high-temperature paint cannot be completely eliminated.

[0008] 2. After the end cap 4-2 of the sheath 4 is welded to the piston rod 2, a protruding weld scar will be formed at the welding point. When the shock absorber is compressed to the limit, the weld scar will directly collide with the oil seal 8, which may sometimes damage the oil seal 8, causing the oil seal 8 to burst and leak oil. Oil seal 8 bursting and leaking oil due to this reason is a serious accident and may very likely cause the entire vehicle frame to deform.

[0009] 3. The upper ring 6 of the shock absorber is hinged to the U-shaped mounting seat on the frame via a shaft bolt. To ensure the strength of the hinged connection, there needs to be sufficient distance between the shaft bolt and the lower end of the U-shaped mounting seat. However, the distance between the shaft of the upper ring 6 of the existing shock absorber and the end cap 4-2 of the protective sleeve 4 is too small. The end cap 4-2 of the protective sleeve 4 and the U-shaped mounting seat on the frame are prone to interference, which affects the versatility of the shock absorber. Moreover, forced installation will cause the U-shaped mounting seat of the frame to scratch the end cap 4-2 of the protective sleeve 4, and may even affect the normal swing of the shock absorber.

[0010] 4. The positioning of components during welding is difficult and welding can cause deformation. Therefore, it is difficult to guarantee the coaxiality between the welded sheath 4 and the main body of the shock absorber. If the coaxiality error is too large, the sheath 4 will rub against the outer surface of the cylinder 1. Moreover, in order to ensure welding reliability, the thickness of the sheath 4 cannot be too thin. This not only increases the cost and weight of the product, but also makes it difficult to correct the coaxiality. In fact, the correction itself may damage the shock absorber and make it scrapped. Utility Model Content

[0011] The technical problem to be solved by this utility model is that the existing welded connection structure between the sheath and the main body of the shock absorber has many shortcomings, which is not conducive to improving the quality of the shock absorber and reducing the cost.

[0012] The technical solution adopted by this utility model to solve its technical problem is as follows: a shock absorber, including a cylinder, a piston rod, an upper lifting lug, a protective sleeve, and a locking nut. The lower end of the piston rod extends into the cylinder, and the upper end of the piston rod has an external thread. The locking nut is screwed onto the upper end of the piston rod through the external thread. The protective sleeve includes a cylindrical body and an end cap at the upper end of the cylindrical body. The end cap has a through hole. The protective sleeve is fitted over the cylinder and piston rod. The upper end of the piston rod passes through the through hole of the end cap. The locking nut is located below the end cap. The lower end face of the upper lifting lug has a threaded hole. The upper lifting lug is screwed onto the upper end of the piston rod through the threaded hole. The upper lifting lug is located above the end cap. The upper lifting lug cooperates with the locking nut to clamp and fix the protective sleeve onto the piston rod.

[0013] The detachable connection structure between the sheath, the upper lug, and the shock absorber body allows the cylinder of the sheath, the upper lug, and the shock absorber body to be painted at high temperature before the oil seal is assembled, thus preventing the oil seal from being damaged by high-temperature painting and causing oil leakage.

[0014] The sheath can be stretched and formed in one go, and the wall thickness can be appropriately reduced. When the sheath deforms, it is easier to correct the coaxiality between the sheath and the shock absorber body.

[0015] In some embodiments, the upper lifting lug may optionally include a lifting ring and a heightening neck, with the upper end of the heightening neck connected to the lifting ring and the threaded hole of the upper lifting lug located on the lower end face of the heightening neck.

[0016] The heightened neck effectively increases the height of the lifting ring relative to the sheath, thereby increasing the installation space between the lifting ring and the sheath. This avoids installation interference caused by insufficient space or scratches after forced installation.

[0017] In some embodiments, the sheath's cylindrical portion and end cap portion are optionally integrally formed.

[0018] One-time stretching and forming of the sheath can improve processing efficiency.

[0019] In some embodiments, optionally, the upper end of the lifting ring and the raised neck are welded together.

[0020] In some embodiments, the lower end face of the locking nut may be a flat surface or a concave surface, and the diameter of the lower end face of the locking nut may be smaller than the diameter of the inner hole of the sheath but larger than the diameter of the end hole at the upper end of the cylinder.

[0021] When the shock absorber is compressed to its limit, the flat or concave lower end face and diameter design of the locking nut ensure that the lower end face of the locking nut will only hit the upper flange of the cylinder, and will not hit the oil seal, thus effectively preventing the oil seal from being damaged by impact.

[0022] In some embodiments, the locking nut may optionally include a cylindrical portion and a flange portion below the cylindrical portion, wherein the lower end face of the flange portion is the lower end face of the locking nut.

[0023] In some embodiments, optionally, the end cap portion of the sheath is also bonded to the upper lug by a metal structural adhesive.

[0024] Alternatively, the end cap of the sheath is bonded to the locking nut with metal structural adhesive;

[0025] Alternatively, the end cap of the sheath is bonded to the upper lug and the locking nut using structural metal adhesive.

[0026] The beneficial effects of this utility model are: the oil seal can be assembled after high-temperature baking paint, thereby preventing the oil seal from being damaged by the high temperature of the high-temperature baking paint, which would lead to oil leakage;

[0027] The locking nut design prevents damage to the oil seal when the shock absorber is compressed to its limit;

[0028] The increased neck height allows for greater installation space between the eyelet and the sheath, improving installation versatility and eliminating the risk of the sheath rubbing against the U-shaped mounting bracket on the frame.

[0029] The sheath can be stretched and formed in one go, and the wall thickness can be appropriately reduced. When the sheath deforms, it is easier to correct the coaxiality between the sheath and the shock absorber body. Attached Figure Description

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0031] Figure 1 A partial cross-sectional view of an existing shock absorber;

[0032] Figure 2 This is a partial cross-sectional view of the present invention;

[0033] In the diagram, 1. Cylinder, 2. Piston rod, 3. Upper lifting lug, 3-1. Lifting ring, 3-2. Extended neck, 4. Protective sleeve, 4-1. Cylinder body, 4-2. End cap, 5. Locking nut, 5-1. Column body, 5-2. Flange, 6. Upper lifting ring, 7. Guide sleeve, 8. Oil seal. Detailed Implementation

[0034] like Figure 2 As shown, a shock absorber includes a cylinder 1, a piston rod 2, an upper lifting lug 3, a sheath 4, and a locking nut 5. The lower end of the piston rod 2 extends into the cylinder 1, and the upper end of the piston rod 2 has an external thread. The locking nut 5 is screwed onto the upper end of the piston rod 2 through the external thread. The sheath 4 includes a cylindrical body 4-1 and an end cap 4-2 at the upper end of the cylindrical body 4-1. The end cap 4-2 has a through hole. The sheath 4 is fitted over the cylinder 1 and the piston rod 2. The upper end of the piston rod 2 passes through the through hole of the end cap 4-2. The locking nut 5 is located below the end cap 4-2. The lower end face of the upper lifting lug 3 has a threaded hole. The upper lifting lug 3 is screwed onto the upper end of the piston rod 2 through the threaded hole. The upper lifting lug 3 is located above the end cap 4-2. The upper lifting lug 3 cooperates with the locking nut 5 to clamp and fix the sheath 4 onto the piston rod 2.

[0035] The upper lifting lug 3 includes a lifting ring 3-1 and a raised neck 3-2. The upper end of the raised neck 3-2 is connected to the lifting ring 3-1, and the threaded hole of the upper lifting lug 3 is located on the lower end face of the raised neck 3-2. The upper ends of the lifting ring 3-1 and the raised neck 3-2 are welded together.

[0036] The cylindrical part 4-1 and the end cap part 4-2 of the sheath 4 are integrally formed, specifically, they are formed by stretching in one step.

[0037] The lower end face of the locking nut 5 is flat, and the diameter of the lower end face of the locking nut 5 is smaller than the diameter of the inner hole of the sleeve 4, but larger than the diameter of the end hole at the upper end of the cylinder 1. The lower end face of the locking nut 5 can also be concave.

[0038] The locking nut 5 includes a column portion 5-1 and a flange portion 5-2 below the column portion 5-1, and the lower end face of the flange portion 5-2 is the lower end face of the locking nut 5.

[0039] The end cap 4-2 of the sheath 4 is also bonded to the upper lug 3 with metal structural adhesive;

[0040] Alternatively, the end cap 4-2 of the sheath 4 is bonded to the locking nut 5 with metal structural adhesive;

[0041] Alternatively, the end cap 4-2 of the sheath 4 is bonded to the upper lug 3 and the locking nut 5 with metal structural adhesive.

Claims

1. A shock absorber, characterized in that: The cylinder includes a cylinder (1), a piston rod (2), an upper lifting lug (3), a sleeve (4), and a locking nut (5). The lower end of the piston rod (2) extends into the cylinder (1), and the upper end of the piston rod (2) has an external thread. The locking nut (5) is screwed onto the upper end of the piston rod (2) through the external thread. The sleeve (4) includes a cylindrical body (4-1) and an end cap (4-2) at the upper end of the cylindrical body (4-1). The end cap (4-2) has a through hole. The sleeve (4) is fitted onto the cylinder. (1) and the outside of the piston rod (2), the upper end of the piston rod (2) passes through the through hole of the end cover (4-2), the locking nut (5) is located below the end cover (4-2), the lower end face of the upper lifting lug (3) has a threaded hole, the upper lifting lug (3) is screwed onto the upper end of the piston rod (2) through the threaded hole, the upper lifting lug (3) is located above the end cover (4-2), the upper lifting lug (3) cooperates with the locking nut (5) to clamp and fix the sheath (4) on the piston rod (2).

2. The shock absorber according to claim 1, characterized in that: The upper lifting lug (3) includes a lifting ring (3-1) and a heightening neck (3-2). The upper end of the heightening neck (3-2) is connected to the lifting ring (3-1), and the threaded hole of the upper lifting lug (3) is located on the lower end face of the heightening neck (3-2).

3. The shock absorber according to claim 1, characterized in that: The cylindrical part (4-1) and the end cap part (4-2) of the sheath (4) are integrally formed.

4. The shock absorber according to claim 2, characterized in that: The upper ends of the lifting ring (3-1) and the heightened neck (3-2) are welded together.

5. The shock absorber according to claim 1, characterized in that: The lower end face of the locking nut (5) is a flat surface or an upper concave surface. The diameter of the lower end face of the locking nut (5) is smaller than the diameter of the inner hole of the sheath (4) and larger than the diameter of the end hole at the upper end of the cylinder (1).

6. The shock absorber according to claim 5, characterized in that: The locking nut (5) includes a column part (5-1) and a flange part (5-2) below the column part (5-1), and the lower end face of the flange part (5-2) is the lower end face of the locking nut (5).

7. The shock absorber according to claim 1, characterized in that: The end cap (4-2) of the sheath (4) is also bonded to the upper lug (3) with metal structural adhesive; Alternatively, the end cap (4-2) of the sheath (4) is bonded to the locking nut (5) with metal structural adhesive; Alternatively, the end cap (4-2) of the sheath (4) is bonded to the upper lug (3) and the locking nut (5) with metal structural adhesive.

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