Oil cylinder structure for hydraulic component of brake-by-wire system

Abstract

An oil cylinder structure for a hydraulic component of a brake-by-wire system comprises an oil cylinder, the oil cylinder and a hydraulic valve block are integrally machined and formed, three arc-shaped oil grooves are formed in the wall of an inner cavity of the oil cylinder in the circumferential direction, the three arc-shaped oil grooves are communicated with an oil way in the hydraulic valve block through formed oil holes, the radius of the inner cavity of the oil cylinder is 18 mm, and the radius of the inner cavity of the oil cylinder is 18 mm. The structure is characterized in that the radiuses of a first oil groove, a second oil groove and a third oil groove in the three arc oil grooves range from 11.5 mm to 12.5 mm, so that the first oil groove is not communicated with the second oil groove, a first spacing wall section is arranged between the first oil groove and the second oil groove, and a second spacing wall section is arranged between the second oil groove and the third oil groove; a third spacing wall section is arranged between the third oil groove and the first oil groove, and the first spacing wall section, the second spacing wall section and the third spacing wall section are all inner cavity walls of the oil cylinder, so that pressure oil of the oil cylinder can enter an oil way in the hydraulic valve block through the first oil groove, the second oil groove and the third oil groove.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile braking, in particular to an oil cylinder structure used for hydraulic components of a wire-controlled brake system. Background Art

[0002] Prior art CN118323072A discloses a hydraulic component assembly for a wire-controlled hydraulic brake system, such as Figure 1 , 2 As shown, this hydraulic component assembly includes an oil cylinder 1d, and the bottom of the inner cavity of the oil cylinder 1d is provided with a first oil groove 1d.1, a second oil groove 1d.2 and a third oil groove 1d.3. The oil cylinder 1d is assembled on the hydraulic valve block 1, and the inner cavity of the oil cylinder 1d is connected with the internal oil circuit of the hydraulic valve block 1 through the oil passage 1h provided inside the first oil groove 1d.1, the second oil groove 1d.2 and the third oil groove 1d.3. The radius of the first oil groove 1d.1, the second oil groove 1d.2 and the third oil groove 1d.3 provided in the radial direction of the oil cylinder mounting seat are all 15mm, and the radius of the oil cylinder 1d is 18mm. The first oil groove 1d.1 and the second oil groove 1d.2 are connected to each other, and the connection between the first oil groove 1d.1 and the second oil groove 1d.2 is a sharp angle 10.1, and a clearance groove is provided at the outer peripheral wall corresponding to the sharp angle 10.1, so that the wall thickness at this place is only 5.5mm.

[0003] When the power device 3 drives the piston part to move through the transmission part, the piston part moves from right to left along the piston mounting hole 1a. During the movement, the piston part pushes the brake fluid inside the piston pump pressure chamber formed by the piston pump cylinder body 1d and the piston mounting hole 1a into the multiple oil circuits in the hydraulic valve block 1, thereby completing the braking work. The oil pressure inside the oil cylinder changes periodically from 0MPa to 18MPa to 0MPa. Since the first oil groove 1d.1 and the second oil groove 1d.2 are connected to each other, the sharp angle 10.1 at the connection is subjected to a large oil pressure when the pressure oil passes through. In addition, the wall thickness here is only 5.5mm. After repeated oil pressure shocks, metal fatigue is prone to occur, resulting in cracking and oil leakage of the oil cylinder. Utility Model Content

[0004] The purpose of the present invention is to provide a cylinder structure for a hydraulic component of a wire control brake system in view of the problems existing in the prior art. By reducing the radius of the oil groove, the connection between the first oil groove and the second oil groove is located on the axially extending wall of the inner wall of the oil cylinder to form a first partition wall section, thereby enhancing the fatigue durability of the oil cylinder and reducing the risk of oil cylinder cracking and oil leakage.

[0005] The technical solution of the utility model is achieved in this way:

[0006] An oil cylinder structure for a hydraulic component of a wire brake system, comprising an oil cylinder, which is integrally machined with a hydraulic valve block. Three arc-shaped oil grooves are respectively arranged along the circumference of the inner cavity wall of the oil cylinder, and the three arc-shaped oil grooves are respectively communicated with the oil circuit in the hydraulic valve block through the provided oil holes. The radius of the inner cavity of the oil cylinder is 18 mm, and the radii of the first oil groove, the second oil groove, and the third oil groove among the three arc-shaped oil grooves are between 11.5 mm and 12.5 mm, so that the first oil groove and the second oil groove are not communicated. A first partition wall section is arranged between the first oil groove and the second oil groove, a second partition wall section is arranged between the second oil groove and the third oil groove, and a third partition wall section is arranged between the third oil groove and the first oil groove. The first partition wall section, the second partition wall section, and the third partition wall section are all the inner cavity walls of the oil cylinder, so that the pressure oil of the oil cylinder can enter the oil circuit in the hydraulic valve block through the first oil groove, the second oil groove, and the third oil groove.

[0007] Preferably, a circle of oil cylinder bosses is provided at the joint of the oil cylinder and the hydraulic valve block, and the three arc-shaped oil grooves are all arranged within the oil cylinder bosses.

[0008] Preferably, the oil holes are arranged at the arc tops of the arc-shaped oil grooves.

[0009] Preferably, the upper and lower wall corners of the arc-shaped oil grooves are all rounded.

[0010] Adopting the above scheme, by reducing the radii of the three arc-shaped oil grooves and setting the oil groove radii between 11.5 mm and 12.5 mm, the connection part between the first oil groove and the second oil groove is located on the axial extension wall of the inner wall of the oil cylinder to form a first partition wall section, so that the first oil groove and the second oil groove are not directly communicated, and the thickness between the first partition wall section and the outer wall of the oil cylinder is increased. Through simulation experiments, it is obtained that the strength of the partition wall section is improved; by rounding the upper and lower wall corners of the arc-shaped oil grooves, the damage to the partition wall section caused by oil pressure impact can be reduced, and the fatigue durability of the oil cylinder.

[0011] Through the simulation comparison test of the oil cylinder, after 115,000 times of periodic oil pressure cycles of 0 MPa - 18 MPa - 0 MPa, the fatigue damage value at the sharp-corner connection part of the original first oil groove and the second oil groove is 0.409, the fatigue damage value of the partition wall section at this place of the present utility model is 0, and the maximum fatigue damage value at other positions is 0.114; the risks of oil cylinder cracking and oil leakage of the oil cylinder are reduced. Description of the Drawings

[0012] Figure 1 It is a schematic plane structure diagram of the prior art;

[0013] Figure 2 It is a schematic plane structure diagram of the cross-section of the oil outlet groove of the prior art;

[0014] Figure 3This is a cross-sectional view of the oil cylinder structure of the present utility model;

[0015] Figure 4 This is a schematic plan view of the cross-section of the oil outlet groove of the present utility model. Specific embodiments

[0016] See Figures 3 to 4 , an oil cylinder structure for a hydraulic component of a wire brake system, including an oil cylinder 21, the oil cylinder 21 is circular, the oil cylinder 21 and a hydraulic valve block 22 are integrally processed, an axially extending cavity of the cavity of the oil cylinder 21 is provided inside the hydraulic valve block 22, a plunger bolt is provided in the axially extending cavity of the hydraulic valve block 22, and a pressure building cavity is formed by the inner cavity of the oil cylinder 21, the axially extending cavity of the hydraulic valve block 22, and the plunger bolt; a circle of oil cylinder bosses 26 is provided at the joint of the oil cylinder 21 and the hydraulic valve block 22, the oil cylinder bosses 26 are in a peach shape, three arc-shaped oil grooves 23 are respectively arranged along the circumference on the inner wall of the inner cavity of the oil cylinder 21, the three arc-shaped oil grooves 23 are all arranged inside the oil cylinder bosses 26, oil holes 25 are provided at the arc tops of the three arc-shaped oil grooves 23, the oil holes 25 are communicated with the oil circuit in the hydraulic valve block 22, the radius of the circular inner cavity of the oil cylinder 21 is 18 mm, the radii of the first oil groove 23a, the second oil groove 23b, and the third oil groove 23c among the three arc-shaped oil grooves 23 are between 11.5 mm and 12.5 mm. By reducing the radii of the three arc-shaped oil grooves 23, the first oil groove 23a and the second oil groove 23b are not directly communicated, a first partition wall section 24a is provided between the first oil groove 23a and the second oil groove 23b, the thickness between the first partition wall section 24a and the outer wall of the oil cylinder 21 is thickened, a second partition wall section 24b is provided between the second oil groove 23b and the third oil groove 23c, and a third partition wall section 24c is provided between the third oil groove 23c and the first oil groove 23a. The first partition wall section 24a, the second partition wall section 24b, and the third partition wall section 24c are all inner wall surfaces of the inner cavity of the oil cylinder 21, and the three arc-shaped oil grooves 23 are not directly communicated; the pressure oil in the oil cylinder 21 can enter the oil circuit in the hydraulic valve block 22 through the first oil groove 23a, the second oil groove 23b, and the third oil groove 23c. The upper and lower wall corners of the arc-shaped oil groove 23 are both rounded, and a relief groove is provided at the outer peripheral wall corresponding to the first oil groove 23a.

[0017] In this embodiment, the radius of the inner cavity of the oil cylinder 21 is 18 mm, the radius of the first oil groove 23a is 11.87 mm, the radius of the second oil groove 23b is 11,87 mm, the radius of the third oil groove 23c is 12.37 mm, the radius of the first oil hole 25a provided in the first oil groove 23a is 2.15 mm, the radius of the second oil hole 25b provided in the second oil groove 23b is 1.60 mm, and the radius of the third oil hole 25c provided in the third oil groove 23c is 1,60 mm.

[0018] The working principle is as follows: the inner cavity of the oil cylinder 21, the axially extending cavity of the hydraulic valve block 22, and the plunger bolt form a pressure building cavity. The power device drives the plunger bolt to move towards the oil cylinder 21, and the hydraulic oil inside the oil cylinder 21 is pressed into the three arc-shaped oil grooves 23. The pressure oil enters multiple oil circuits of the hydraulic valve block 22 through the oil holes 25 provided at the arc tops of the three arc-shaped oil grooves 23, thereby completing the braking work.

[0019] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Without departing from the spirit of the present invention, any modifications made by those skilled in the art fall within the protection scope of the present invention.

Claims

1. A cylinder structure for a hydraulic component of a wire control brake system, comprising a cylinder (21), wherein the cylinder (21) and a hydraulic valve block (22) are integrally formed, wherein three circular oil grooves (23) are respectively arranged along the circumference of the inner cavity wall of the cylinder (21), wherein the three circular oil grooves (23) are respectively connected to the oil path in the hydraulic valve block (22) through oil holes (25) provided therein, wherein the radius of the inner cavity of the cylinder (21) is 18 mm, and wherein: The radius of the first oil groove (23a), the second oil groove (23b) and the third oil groove (23c) of the three circular oil grooves is between 11.5 mm and 12.5 mm, so that the first oil groove (23a) and the second oil groove (23b) are not connected, a first partition wall section (24a) is provided between the first oil groove (23a) and the second oil groove (23b), a second partition wall section (24b) is provided between the second oil groove (23b) and the third oil groove (23c), and a third partition wall section (24c) is provided between the third oil groove (23c) and the first oil groove (23a), and the first partition wall section (24a), the second partition wall section (24b) and the third partition wall section (24c) are all inner cavity walls of the oil cylinder (21), so that the pressure oil of the oil cylinder (21) can enter the oil path in the hydraulic valve block (22) through the first oil groove (23a), the second oil groove (23b) and the third oil groove (23c).

2. The oil cylinder structure for the hydraulic component of a wire control brake system according to claim 1, characterized in that: A circle of cylinder bosses (26) is provided at the junction of the oil cylinder (21) and the hydraulic valve block (22), and the three circular arc oil grooves (23) are all arranged in the cylinder bosses (26).

3. The oil cylinder structure for the hydraulic component of a wire control brake system according to claim 1, characterized in that: The oil hole (25) is arranged at the top of the arc oil groove (23).

4. The oil cylinder structure for a hydraulic component of a brake-by-wire system according to claim 1, characterized in that: The corners of the upper and lower walls of the circular arc oil groove (23) are both rounded.

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