Welded riveted limit structure for centering cylinder assembly

Abstract

The present application relates to the technical field of centering cylinder, in particular to a welding riveting type limiting structure centering cylinder assembly, which comprises a cylinder body, a limiting ring, a left floating piston, a right floating piston and a piston rod for driving the left floating piston and the right floating piston to slide, the piston rod is slidably connected in the cylinder body, the cylinder body is provided with a left oil cavity and a right oil cavity which are in communication with each other, the left floating piston is slidably connected in the left oil cavity, the right floating piston is slidably connected in the right oil cavity, the diameter of the left oil cavity is smaller than that of the right oil cavity, a positioning step is formed at the connection of the left oil cavity and the right oil cavity, the limiting ring is located at the positioning step and is in interference fit with the cylinder body, and the limiting ring and the cylinder body are fixedly connected through a connecting piece. The limiting ring is connected with the cylinder body in the interference fit mode, and on this basis, the limiting ring and the cylinder body are fixed through the connecting piece, and the oil pressure of the left oil cavity and the right oil cavity cannot be directly applied to the connecting piece, thereby the problem that the connecting piece is failed or even broken due to long-term receiving of the oil pressure can be avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of centering cylinders, in particular to a welding and riveting type limiting structure centering cylinder assembly. BACKGROUND

[0002] The centering cylinder assembly of an automobile steering system generally comprises a cylinder body, a piston rod and a limiting ring, the limiting ring is fixed in the cylinder body, dividing the cylinder body into left and right oil chambers, and a floating piston is respectively connected in the left and right oil chambers. When the automobile is not steering, the left and right oil chambers are filled with oil, and the left and right floating pistons slide to the limiting ring at the middle of the cylinder body under the action of oil pressure, locking the piston rod at the centering position, so that the automobile steering wheel is centered, ensuring the stability of vehicle driving. When steering, the oil pressure of the left and right oil chambers is released, and the left and right floating pistons are in a floating state, so that the piston rod can freely move with the left and right floating pistons driven by the steering mechanism, without affecting the steering of the wheels.

[0003] The existing limiting plate of the centering cylinder assembly is gap-fitted with the cylinder body, and the limiting ring is fixed by a snap spring clamped between the cylinder body and the limiting ring. Due to the gap-fitting between the limiting ring and the cylinder body, the snap spring is repeatedly impacted by the hydraulic oil in the left and right oil chambers, and after long-term use, the snap spring is prone to loosen or even break, thereby causing the limiting function of the centering cylinder assembly to fail, and the centering cylinder assembly to be scrapped. SUMMARY

[0004] The present application aims to provide a welding and riveting type limiting structure centering cylinder assembly to solve the problem of short service life and easy failure of the existing limiting structure of the centering cylinder assembly.

[0005] In order to achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0006] The welding and riveting type limiting structure centering cylinder assembly comprises a cylinder body, a limiting ring, a left floating piston, a right floating piston and a piston rod for driving the left and right floating pistons to slide, the piston rod is slidingly connected in the cylinder body, the cylinder body is provided with a left oil chamber and a right oil chamber which are in communication with each other, the left floating piston is slidingly connected in the left oil chamber, the right floating piston is slidingly connected in the right oil chamber, the diameter of the left oil chamber is smaller than that of the right oil chamber, a positioning step is formed at the connection of the left and right oil chambers, the limiting ring is located at the positioning step and is interference-fitted with the cylinder body, and the limiting ring and the cylinder body are fixedly connected through a connecting piece.

[0007] The principle and beneficial effects of the present application are as follows:

[0008] When turning, the left floating piston and the right floating piston are in a floating state, and can freely slide in the left oil chamber and the right oil chamber on the left and right sides of the piston rod without affecting the turning of the wheels. When not turning, high-pressure oil is supplied to the left oil chamber and the right oil chamber to drive the left floating piston and the right floating piston to move to the middle part of the cylinder body until abutting against the limiting ring, and the centering limiting of the piston rod is realized by abutting the left floating piston and the right floating piston against the piston rod, so that the wheels on both sides are centered, and the vehicle is kept stable driving.

[0009] In the scheme, the limiting ring is connected with the cylinder body in an interference fit, and the limiting ring and the cylinder body are fixed by the connecting piece. Since the interference fit eliminates the gap between the cylinder body and the limiting ring, the oil pressure of the left oil chamber and the right oil chamber cannot be directly applied to the connecting piece, thereby avoiding the problem that the connecting piece is failed or even broken due to long-term oil pressure, effectively prolonging the service life of the connecting piece, and further improving the installation stability of the limiting ring and the service life of the centering cylinder assembly.

[0010] In view of the problem that the limiting structure of the snap spring installed limiting ring is easy to fail, the inventors initially adopted the most intuitive solution in the field, that is, increasing the thickness of the snap spring to improve its service life. Although this method can prolong the service life of the snap spring to a certain extent, the snap spring will eventually fail or even break due to long-term oil pressure impact, and the problem cannot be fundamentally solved. After numerous experiments and researches, the inventors finally found the root cause of the problem, that is, there is a gap between the limiting ring and the cylinder body, so the oil pressure can directly act on the snap spring, causing the snap spring to fail or even break. Based on this, the inventors took a different approach based on the root cause of the problem, that is, eliminating the gap, and after a lot of creative labor, the scheme was obtained.

[0011] Further, the connecting piece is a conical pin, and there are at least three conical pins which are uniformly distributed in the circumferential direction of the cylinder body.

[0012] Beneficial effects: In the scheme, the conical pin is punched in the circumferential direction to connect the limiting ring and the cylinder body. Compared with the method of opening a groove on the inner wall of the cylinder body and the limiting ring, then compressing the snap spring to be clamped into the groove to connect the limiting ring and the cylinder body, the conical pin is directly punched in the circumferential direction without opening a groove on the inner wall of the limiting ring and the cylinder body, and the processing and assembly are simpler.

[0013] Further, the connection between the conical pin and the surface of the cylinder body is filled with solder.

[0014] Beneficial effects: Such arrangement can improve the connection strength of the conical pin and the cylinder body, thereby further improving the connection strength of the cylinder body and the limiting ring.

[0015] Further, an oil inlet is installed on the cylinder body, the oil inlet communicates with the right oil chamber, and an oil inlet pipe communicates between the oil inlet and the left oil chamber.

[0016] Beneficial effects: Compared to connecting the left and right oil chambers to oil inlets separately, this solution only requires one oil inlet, which facilitates centralized control and processing, and has a simpler structure.

[0017] Furthermore, a notch is provided on the right side of the left floating piston, and the piston rod includes a rod body. The right floating piston slides through the rod body, and a mating block that can extend into the notch is fixed at the left end of the rod body. A top block is fixed on the right side of the mating block, and the diameter of the top block is larger than the diameter of the notch and the inner diameter of the right floating piston.

[0018] Beneficial effects: This design has a simple structure, which facilitates the piston rod to drive the left and right floating pistons; the notch on the left floating piston reduces the space occupied by the left floating piston, thereby shortening the length of the left oil chamber and reducing the size of the equipment. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention;

[0020] Figure 2 for Figure 1 A longitudinal sectional view;

[0021] Figure 3 for Figure 1 Top view;

[0022] Figure 4 for Figure 3 AA view. Detailed Implementation

[0023] The following detailed description illustrates the specific implementation method:

[0024] The reference numerals in the accompanying drawings include: cylinder 1, oil inlet pipe 2, oil inlet 3, rod 4, left oil chamber 5, left floating piston 6, notch 7, right floating piston 8, right oil chamber 9, mating block 10, limit ring 11, top block 12, guide sleeve 13, and tapered pin 14.

[0025] Example:

[0026] like Figure 1 , Figure 2 and Figure 3 As shown, the welded and riveted limiting structure centering cylinder assembly includes a cylinder body 1, a limiting ring 11, a left floating piston 6, a right floating piston 8, and a piston rod. The cylinder body 1 has a left oil chamber 5 and a right oil chamber 9 that are interconnected. The left floating piston 6 is slidably connected in the left oil chamber 5, and the right floating piston 8 is slidably connected in the right oil chamber 9. An oil inlet 3 is installed on the cylinder body 1, communicating with the right oil chamber 9. An oil inlet pipe 2 connects the oil inlet 3 to the left oil chamber 5.

[0027] The left floating piston 6 is provided with a notch 7 on the right side, the piston rod comprises a rod body 4, the right end of the cylinder body 1 is sealed with a guide sleeve 13, and the rod body 4 is slidably connected in the guide sleeve 13. The right floating piston 8 slides through the rod body 4, the left end of the rod body 4 is fixedly sleeved with a matching block 10, and the matching block 10 can extend into the notch 7. The rod body 4 on the right side of the matching block 10 is fixedly sleeved with a top block 12, and the diameter of the top block 12 is greater than the diameter of the notch 7 and the inner diameter of the right floating piston 8.

[0028] The diameter of the left oil cavity 5 is smaller than that of the right oil cavity 9, so that a positioning step is formed at the connection of the left oil cavity 5 and the right oil cavity 9. Figure 4 As shown, the limiting ring 11 is located at the positioning step and is in interference fit with the cylinder body 1, and the limiting ring 11 and the cylinder body 1 are fixedly connected through a connecting piece. In the embodiment, the connecting piece is a conical pin 14, and the number of the conical pin 14 is at least three and is uniformly distributed in the circumferential direction of the cylinder body 1. In the embodiment, the number of the conical pin 14 is preferably three. After the conical pin 14 is punched into the cylinder body 1, the connection position on the surface of the cylinder body 1 is treated by filling welding and polished.

[0029] The specific implementation process is as follows:

[0030] When the automobile is turning, there is no high-pressure oil in the left oil cavity 5 and the right oil cavity 9, and the left floating piston 6 and the right floating piston 8 are in a floating state and can freely slide in the cylinder body 1 on the left and right sides of the piston rod, without affecting the steering of the wheels. When not turning, high-pressure oil is introduced into the left oil cavity 5 and the right oil cavity 9 through the oil inlet 3, and the left floating piston 6 and the right floating piston 8 move to the middle under the action of the high-pressure oil and finally abut against the limiting ring 11. The piston rod is pressed tightly from both sides by the left floating piston 6 and the right floating piston 8, so that the piston rod remains in a centered state, and the wheels remain in a centered state, thereby ensuring stable driving of the vehicle.

[0031] In the embodiment, the limiting ring 11 and the cylinder body 1 are in interference fit, and there is no gap between the two, so the oil pressure of the left oil cavity 5 and the right oil cavity 9 cannot directly act on the conical pin 14, thereby fundamentally solving the problem of failure of the connecting piece (a snap spring in the prior art). In addition, since the gap between the cylinder body 1 and the limiting ring 11 is eliminated in the scheme, only a few conical pins 14 in the circumferential direction are needed to stably fix the limiting ring 11 and the cylinder body 1. During assembly, the limiting ring 11 is directly pressed into the positioning step by using a press, and then the conical pin 14 is punched in. Compared with the installation mode in the prior art, in which a clamping groove is first formed on the inner wall of the cylinder body 1 and the outer circumference of the limiting ring 11, and then a snap spring is compressed and clamped into the clamping groove, the assembly mode of the embodiment is simpler.

[0032] The scheme has simple structure, and the service life of the scheme is much longer than the service life of the limiting structure installed by the snap spring in the prior art. It is verified by experiments that the structure of the limiting ring 11 installed by the snap spring in the prior art can only withstand 300-400 thousand times of impact, and the snap spring will be broken and fail. The limiting structure of the scheme still does not fail after withstanding 1 million times of impact.

[0033] The above is only an embodiment of the present application, and the well-known specific structure and characteristics in the scheme are not described in detail. It should be pointed out that for those skilled in the art, without departing from the structure of the present application, a number of modifications and improvements can be made, which should also be considered as the protection scope of the present application, which will not affect the effect and practicality of the patent. The protection scope claimed in the present application should be subject to the content of its claims, and the specific implementation mode and the like in the specification can be used to explain the content of the claims.

Claims

1. A centering cylinder assembly with welded riveted limit structure, comprising a cylinder body, a limit ring, a left floating piston, a right floating piston and a piston rod for driving the left floating piston and the right floating piston to slide, the piston rod being slidingly connected in the cylinder body, characterized in that: The cylinder is provided with left oil cavity and right oil cavity which are communicated with each other, the left floating piston is slidably connected in the left oil cavity, the right floating piston is slidably connected in the right oil cavity, the diameter of the left oil cavity is smaller than that of the right oil cavity, a positioning step is formed at the connection of the left oil cavity and the right oil cavity, the limiting ring is located at the positioning step and is in interference fit with the cylinder, the limiting ring and the cylinder are fixedly connected through the connecting piece; the connecting piece is conical pin, the conical pin is at least three and is uniformly distributed in the circumference of the cylinder; the connecting position of the conical pin and the surface of the cylinder is filled with welding material; the cylinder is provided with oil inlet, the oil inlet is communicated with the right oil cavity, and the oil inlet and the left oil cavity are communicated with the oil inlet pipe; the right side of the left floating piston is provided with a gap, the piston rod comprises a rod body, the right floating piston is slidably arranged on the rod body, the left end of the rod body is fixedly provided with a matching block which can extend into the gap, the right side of the matching block is fixedly provided with a top block, and the diameter of the top block is larger than the diameter of the gap and the inner diameter of the right floating piston.

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