Brake cylinder

Abstract

The utility model discloses a brake cylinder, including cylinder, piston, piston rod and compression spring, and compression spring is equipped with in the outer periphery of piston rod, and compression spring is limited between the first end portion of cylinder and the second end of piston rod, and compression spring makes piston rod always have the movement tendency of stretching out. When it supplies oil to the rod cavity through the high pressure oil port, the piston drives the piston rod to overcome the elastic force of the compression spring and retract until the rod cavity is filled with oil, the piston drives the piston rod to retract to the limit position, and the parking brake is realized. When stopping supplying oil to the rod cavity, the piston rod stretches out under the elastic force of the compression spring, the piston moves along with the piston rod, the hydraulic oil in the rod cavity is discharged from the high pressure oil port until the oil in the rod cavity is exhausted, the piston rod stretches out to the limit position, and the parking brake is released. Because the volume of the rod cavity is smaller than that of the rodless cavity, the time required for filling and emptying oil is shorter, that is, the response speed of the utility model for parking brake and releasing parking brake is faster, and it is more beneficial to safe driving.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinder technology, and in particular to a brake cylinder. Background Technology

[0002] The hydraulic brake cylinder is the core component of the hydraulic brake. Essentially, it is an energy conversion device that transforms hydraulic energy into reciprocating linear motion mechanical energy. Existing hydraulic parking brake cylinders mainly consist of a cylinder body, piston, piston push rod, and spring. The piston and spring are housed in the cylinder body cavity. The piston push rod extends into the cylinder body and is fixedly connected to the piston. The spring is sleeved on the outer circumference of the piston push rod, with its two ends abutting against the piston and the inner wall of the cylinder body cavity, respectively. Under the combined action of oil pressure and spring force, the piston drives the piston push rod to complete the extension and retraction actions, thereby achieving braking and releasing the brake, ensuring vehicle driving safety.

[0003] For example, a Chinese utility model patent (authorization announcement number: CN222479295U) discloses a high-efficiency and rapid-actuating brake cylinder, including a cylinder body and a piston rod inside the cylinder body. The cylinder body is a cylindrical structure with openings at both ends, and a front end cover and a rear end cover are respectively provided at both ends. A guide post extends inward from the center of the front end cover, and a first oil passage is provided inside the guide post. One end of the first oil passage is connected to the inner cavity of the piston rod, and the other end extends to the front end cover to form an oil injection hole. A second oil passage is provided inside the front end cover and is connected to the oil injection hole. The other end of the second oil passage is located on the front end cover between the piston rod and the cylinder body. A piston rod is sleeved on the outside of the guide post, and a ball joint is connected to the top of the piston rod. A baffle is provided around the piston rod, and a piston is provided on the side of the baffle near the front end cover. A double spring assembly is provided between the baffle and the rear end cover. It achieves rapid movement of the piston rod through dual oil passages, and also serves as a double safety measure to prevent operation failure due to a malfunction in one oil passage, thus improving the safety of use.

[0004] However, the aforementioned prior art discloses a high-efficiency, rapid-actuation brake cylinder whose working logic is as follows: after oil is injected into the rodless chamber of the cylinder, the piston compresses the double-spring assembly under oil pressure, causing the piston rod to extend and release the brake; when the hydraulic oil in the rodless chamber is emptied, the piston retracts under the elastic force of the double-spring assembly, causing the piston rod to retract and achieve braking. Because the volume of the rodless chamber is larger than that of the rod chamber, the response process for both braking and releasing the brake is relatively long, increasing the risk factor during use.

[0005] Therefore, it is necessary to improve the existing technology. Utility Model Content

[0006] The purpose of this invention is to solve the problem that the response process of braking and releasing the brake cylinder in the prior art is relatively long, which increases the risk factor during use, and therefore a new type of brake cylinder is proposed.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A brake cylinder includes a cylinder body, a piston, a piston rod, and a compression spring. The cylinder body has a piston chamber, and the piston is slidably disposed within the piston chamber, dividing the piston chamber into a rod chamber and a rodless chamber. The cylinder body has a first end, and a first end of the piston rod is fixedly connected to the piston. A second end of the piston rod extends out of the first end. The cylinder body has a high-pressure oil port communicating with the rod chamber and a balance oil port communicating with the rodless chamber. The compression spring is sleeved on the outer periphery of the piston rod and is limited between the first end of the cylinder body and the second end of the piston rod. The compression spring ensures that the piston rod always has a tendency to extend.

[0008] Furthermore, the outer peripheral wall of the piston is provided with an annular groove, and a first sealing ring and a second sealing ring are provided in the annular groove. The first sealing ring and the second sealing ring are arranged radially along the piston.

[0009] Furthermore, the first sealing ring has a circular or square cross-section, and the second sealing ring has a circular or square cross-section.

[0010] Furthermore, the first sealing ring is fitted over the outside of the second sealing ring, the first sealing ring has a square cross-section, and the second sealing ring has a circular cross-section.

[0011] Furthermore, a limiting member is fixedly connected to the second end of the piston rod, and the compression spring is positioned between the first end of the cylinder and the limiting member.

[0012] Furthermore, the limiting member has an annular groove, the end of the cylinder has a stepped groove, one end of the compression spring is accommodated in the annular groove, and the other end of the compression spring is accommodated in the stepped groove.

[0013] Furthermore, the first end is an open end, and an end cap is fixedly connected to the open end. The piston rod passes through the end cap and slides in cooperation with the end cap.

[0014] Furthermore, the end cap is threadedly connected to the cylinder body.

[0015] Furthermore, the inner wall of the piston cavity is provided with a first limiting inclined surface, and a limiting snap ring is fitted onto the inner wall of the piston cavity. The end cap is positioned between the first limiting inclined surface and the limiting snap ring.

[0016] Furthermore, a third sealing ring is provided between the end cap and the inner wall of the piston chamber, and a fourth sealing ring is provided between the end cap and the piston rod.

[0017] The beneficial effects of this utility model after adopting the above structure are as follows: (1) In the brake cylinder of this utility model, when oil is supplied to the rod chamber through the high-pressure oil port, the piston drives the piston rod to retract against the elastic force of the compression spring until the rod chamber is full of oil. The piston then drives the piston rod to retract to the limit position to realize the parking brake. When the oil supply to the rod chamber stops, the piston rod extends under the elastic force of the compression spring. The piston moves with the piston rod, and the hydraulic oil in the rod chamber is discharged from the high-pressure oil port until the oil in the rod chamber is emptied. The piston rod then extends to the limit position to release the parking brake. In this utility model, since the volume of the rod chamber is smaller than that of the rodless chamber, the time required for it to be filled and emptied is shorter. That is, the brake cylinder of this utility model has a faster response speed for parking brake and parking brake release, which is more conducive to safe driving.

[0018] (2) In the brake cylinder of this utility model, the compression spring is sleeved on the outer periphery of the piston rod and located at the portion of the piston rod extending out of the piston cavity. The compression spring is limited between the first end of the cylinder body and the limiting member. In traditional brake cylinders, the compression spring is installed in the rod cavity, which is connected to the outside gas. Foreign objects can easily enter the cavity with the airflow, leading to corrosion or damage to the piston seal. After damage, foreign objects will further invade the rodless cavity, contaminating the hydraulic oil. When the hydraulic oil flows back to the system, it will cause instability in the entire system. At the same time, the compression spring is prone to generating debris during repeated compression and recovery in the rod cavity. This debris will also affect the stability of the system. In this utility model, the compression spring is set on the outside of the cylinder body, which makes the inside of the cylinder body better sealed with the outside, preventing external air from entering the piston cavity. Furthermore, both the rod cavity and the rodless cavity are filled with hydraulic oil, which helps to extend the service life of the piston. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of this utility model, the accompanying drawings used in the description of the specific embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a cross-sectional view of the overall structure of this utility model. Figure 1 ; Figure 3 This is the utility model Figure 2 Enlarged schematic diagram of the structure at point A; Figure 4 This is a cross-sectional view of the overall structure of this utility model. Figure 2 ; Figure 5 This is a cross-sectional view of the cylinder body of this utility model.

[0021] Figures 1 to 5 The winning number is: 1. Cylinder block; 11. Piston chamber; 111. Rod chamber; 112. Rodless chamber; 12. High-pressure oil port; 13. Balance oil port; 14. Step groove; 15. First end; 16. Limiting slope; 17. Limiting snap ring; 2. Piston; 21. Annular groove; 211. First sealing ring; 212. Second sealing ring; 3. Piston rod; 31. Limiting component; 311. Annular groove; 4. Compression spring; 5. End cap; 51. Third sealing ring; 52. Fourth sealing ring; 53. Second limiting slope. Detailed Implementation

[0022] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0023] In the description of this utility model, it should be understood that if terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, the term "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0025] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0026] In this utility model, unless otherwise explicitly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact, or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0027] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this invention are for illustrative purposes only and do not represent the only possible implementation.

[0028] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] like Figures 1 to 5As shown, a brake cylinder includes a cylinder body 1, a piston 2, a piston rod 3, and a compression spring 4. The cylinder body 1 has a piston chamber 11, and the piston 2 is slidably disposed in the piston chamber 11, dividing the piston chamber 11 into a rod chamber 111 and a rodless chamber 112. The cylinder body 1 has a first end 15, and the first end of the piston rod 3 is fixedly connected to the piston 2. The second end of the piston rod 3 extends out of the first end 15. The cylinder body 1 has a high-pressure oil port 12 communicating with the rod chamber 111 and a balance oil port 13 communicating with the rodless chamber 112. The compression spring 4 is sleeved on the outer periphery of the piston rod 3, and the compression spring 4 is limited between the first end 15 of the cylinder body 1 and the second end of the piston rod 3. The compression spring 4 ensures that the piston rod 3 always has an extension tendency.

[0030] Based on the above embodiments, this utility model provides a brake cylinder that, when supplying oil to the rod chamber 111 through the high-pressure oil port 12, causes the piston 2 to drive the piston rod 3 to retract against the elastic force of the compression spring 4 until the rod chamber 111 is filled with oil. The piston 2 then drives the piston rod 3 to retract to its limit position. Figure 4 As shown, this achieves parking brake operation; when oil supply to the rod chamber 111 stops, the piston rod 3 extends under the elastic force of the compression spring 4, and the piston 2 moves with the piston rod 3. Hydraulic oil in the rod chamber 111 is discharged from the high-pressure oil port 12 until the oil in the rod chamber 111 is emptied, at which point the piston rod 3 extends to its limit position, as shown. Figure 2 As shown, the parking brake is released. In this invention, because the volume of the rod chamber 111 is smaller than that of the rodless chamber 112, the time required for it to be filled with oil and emptied is shorter. That is, the cylinder of this invention responds to the parking brake and release the parking brake faster, which is more conducive to safe driving.

[0031] In this embodiment, the compression spring 4 is sleeved on the outer periphery of the piston rod 3 and located at the portion of the piston rod 3 that extends out of the piston chamber 11. The compression spring 4 is confined between the first end 15 of the cylinder body 1 and the limiting member 31. In traditional brake cylinders, the compression spring is installed in the rod chamber, which is connected to the outside gas. Foreign objects can easily enter the chamber with the airflow, causing corrosion or damage to the piston seal. After the piston is damaged, foreign objects will further invade the rodless chamber and contaminate the hydraulic oil. When the hydraulic oil flows back into the system, it will cause instability in the entire system. At the same time, the compression spring is prone to generating debris during repeated compression and recovery in the rod chamber, and this debris will also affect the stability of the system. In this invention, the compression spring 4 is set on the outside of the cylinder body 1, which makes the inside of the cylinder body 1 better sealed with the outside, preventing outside air from entering the piston chamber 11. Furthermore, both the rod chamber 111 and the rodless chamber 112 are filled with hydraulic oil, which helps to extend the service life of the piston 2.

[0032] In another preferred embodiment of this utility model, the outer peripheral wall of the piston 2 is provided with an annular groove 21, and a first sealing ring 211 and a second sealing ring 212 are disposed within the annular groove 21. The first sealing ring 211 and the second sealing ring 212 are arranged radially along the piston 2. The cross-section of the first sealing ring 211 is circular or square, and the cross-section of the second sealing ring 212 is circular or square. The first sealing ring 211 is sleeved on the outside of the second sealing ring 212, and the cross-section of the first sealing ring 211 is square, while the cross-section of the second sealing ring 212 is circular. In this embodiment, as... Figure 3 As shown, a first sealing ring 211 and a second sealing ring 212 are provided in the annular sealing groove. The double sealing ring configuration enables automatic compensation, increasing the sealing performance between the piston 2 and the inner wall of the piston cavity 11. In a further embodiment, the first sealing ring 211 is sleeved on the outside of the second sealing ring 212. The cross-section of the first sealing ring 211 is square, and the cross-section of the second sealing ring 212 is circular. The square first sealing ring 211 contacts the inner wall of the piston cavity 11. The square sealing ring has a large sealing contact area, superior pressure resistance, strong anti-extrusion ability, and is suitable for the high-pressure working conditions of the reciprocating motion of the piston 2, resulting in excellent sealing stability. The circular second sealing ring 212 contacts the piston 2. The circular sealing ring has the characteristics of simple structure, convenient installation, and economical cost. By using the first sealing ring 211 and the second sealing ring 212 in combination, both ensure the sealing reliability of the piston 2 during movement.

[0033] In another preferred embodiment of this utility model, the second end of the piston rod 3 is fixedly connected to a limiting member 31, and the compression spring 4 is limited between the first end 15 of the cylinder 1 and the limiting member 31. The limiting member 31 has an annular groove 311, and the end of the cylinder 1 has a stepped groove 14. One end of the compression spring 4 is accommodated in the annular groove 311, and the other end of the compression spring 4 is accommodated in the stepped groove 14. In this embodiment, as... Figure 1 and Figure 4 As shown, the limiting member 31 prevents the compression spring 4 from dislodging from the second end of the piston rod 3. The annular groove 311 and the stepped groove 14 guide both ends of the compression spring 4, preventing the compression spring 4 from shifting or moving during compression and recovery, thus improving the stability of the compression spring 4 during operation.

[0034] In another preferred embodiment of this utility model, the first end 15 is an open end, and an end cap 5 is fixedly connected to the open end. The piston rod 3 passes through the end cap 5 and slides with the end cap 5. The end cap 5 is threadedly connected to the cylinder body 1. A first limiting inclined surface 16 is provided on the inner wall of the piston cavity 11, and a limiting snap ring 17 is fitted onto the inner wall of the piston cavity 11. The end cap 5 is limited between the first limiting inclined surface 16 and the limiting snap ring 17. A third sealing ring 51 is provided between the end cap 5 and the inner wall of the cylinder body 1, and a fourth sealing ring 52 is provided between the end cap 5 and the piston rod 3. In this embodiment, as... Figure 3 and Figure 5 As shown, the first end of the cylinder body 1 is designed as an open end, which improves the ease of installation of the piston 2 and piston rod 3. In a further embodiment, the end cap 5 is threadedly connected to the cylinder body 1. The threaded connection between the cylinder body 1 and the end cap 5 has the advantages of compact structure, convenient installation and disassembly, easy assembly, inspection, maintenance and component replacement, and strong connection stability, which can withstand the pressure and vibration loads generated during the operation of the brake cylinder. In other preferred embodiments, the end cap 5 is fixedly connected by a limiting inclined surface 16 and a limiting snap ring 17. Specifically, the inner wall of the piston cavity 11 is provided with a first limiting inclined surface 16, and the outer peripheral wall of the end cap 5 is provided with a second limiting inclined surface 53 that cooperates with the first limiting inclined surface 16. The end cap 5 achieves a limiting cooperation between one end of the end cap 5 and the inner wall of the piston cavity 11 through the abutment cooperation between the second limiting inclined surface 53 and the first limiting inclined surface 16; the other end of the end cap 5 is limited by the limiting snap ring 17. The end cap 5 and cylinder 1 are fixedly connected by the limiting snap ring 17 and the first limiting inclined surface 16, which has the advantages of simple and compact structure, effectively simplifying the overall design of cylinder 1 and saving installation space; the limiting snap ring 17 itself is economical and has mature processing technology, which can reduce the overall manufacturing cost, and it is compatible with various specifications of cylinder 1 and end cap 5, and has strong adaptability to the tolerance of the mounting surface; at the same time, the limiting snap ring 17 can stably bear axial load, and together with the sealing structure, it can ensure the reliability and sealing of the connection, effectively resist the vibration during the operation of the cylinder, and ensure the stability of the overall structure.

[0035] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this utility model.

Claims

1. A brake cylinder, comprising a cylinder body (1), a piston (2), a piston rod (3), and a compression spring (4), wherein the cylinder body (1) has a piston chamber (11), the piston (2) is slidably disposed within the piston chamber (11), and the piston (2) divides the piston chamber (11) into a rod chamber (111) and a rodless chamber (112), the cylinder body (1) has a first end (15), the first end of the piston rod (3) is fixedly connected to the piston (2), and the second end of the piston rod (3) extends out from the first end (15), characterized in that: The cylinder (1) has a high-pressure oil port (12) communicating with the rod chamber (111) and a balance oil port (13) communicating with the rodless chamber (112). The compression spring (4) is sleeved on the outer periphery of the piston rod (3), and the compression spring (4) is limited to the first end (15) of the cylinder (1) and the second end of the piston rod (3). The compression spring (4) makes the piston rod (3) always have an extension tendency.

2. A brake cylinder according to claim 1, characterized in that: The piston (2) has an annular groove (21) on its outer peripheral wall. A first sealing ring (211) and a second sealing ring (212) are provided in the annular groove (21). The first sealing ring (211) and the second sealing ring (212) are arranged radially along the piston (2).

3. A brake cylinder according to claim 2, characterised in that: The first sealing ring (211) has a circular or square cross-section, and the second sealing ring (212) has a circular or square cross-section.

4. A brake cylinder according to claim 2, characterised in that: The first sealing ring (211) is fitted on the outside of the second sealing ring (212). The first sealing ring (211) has a square cross-section, and the second sealing ring (212) has a circular cross-section.

5. A brake cylinder according to claim 1, characterized in that: The second end of the piston rod (3) is fixedly connected to a limiting member (31), and the compression spring (4) is limited between the first end (15) of the cylinder (1) and the limiting member (31).

6. A brake cylinder according to claim 5, characterised in that: The limiting member (31) has an annular groove (311), the end of the cylinder (1) has a stepped groove (14), one end of the compression spring (4) is accommodated in the annular groove (311), and the other end of the compression spring (4) is accommodated in the stepped groove (14).

7. A brake cylinder according to claim 1, characterized in that: The first end (15) is an open end, and an end cap (5) is fixedly connected to the open end. The piston rod (3) passes through the end cap (5) and slides with the end cap (5).

8. A brake cylinder according to claim 7, characterised in that: The end cap (5) is threadedly connected to the cylinder body (1).

9. A brake cylinder according to claim 7, characterized in that: The inner wall of the piston cavity (11) is provided with a first limiting inclined surface (16), and a limiting snap ring (17) is fitted on the inner wall of the piston cavity (11). The end cap (5) is located between the first limiting inclined surface (16) and the limiting snap ring (17).

10. A brake cylinder according to claim 7, characterized in that: A third sealing ring (51) is provided between the end cap (5) and the inner wall of the piston chamber (11), and a fourth sealing ring (52) is provided between the end cap (5) and the piston rod (3).

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