Brake cylinder assembly

Abstract

The utility model relates to the technical field of brake systems, in particular to a brake cylinder assembly which comprises a cylinder body, the cylinder body is of a tubular structure, a front piston assembly and a rear piston which are coaxially and oppositely arranged are inserted into the two ends in the cylinder body respectively, and the edges of the front piston assembly and the rear piston at the two ends of the cylinder body are connected with the peripheral edge of the cylinder body through a first leather sheath and a second leather sheath. One end of the first leather sheath and one end of the second leather sheath are both fixed to the cylinder body in an embedded mode, limiting pieces are fixed to the peripheries of the first leather sheath and the second leather sheath, and the problems that in the prior art, the number of parts of a device is large, the integration degree is low, assembly can be completed only through manual welding or threaded connection, the cost is high, and time and labor are wasted are solved; and secondly, the problem that in the prior art, a gap adjusting piston, a rear brake wheel cylinder piston and a protective cover connected with a cylinder body are fixed in an inserted connection mode, and when the gap between the gap adjusting piston and the rear brake wheel cylinder piston is increased or decreased, the protective cover is likely to be jacked through and fall off is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of braking systems, and particularly relates to a brake cylinder assembly. Background Art

[0002] The brake cylinder assembly, as an indispensable part of an automotive braking system, plays a crucial role. It is a precision device that is responsible for converting the force applied by the driver when stepping on the brake pedal in an emergency into an actual braking effect. This process involves a series of complex mechanical actions, where the master cylinder is the heart of the entire system. It receives the pressure from the pedal and transfers this pressure to each wheel cylinder through a hydraulic system. The wheel cylinder contains a piston that moves under the action of hydraulic pressure, pushing the brake shoe or brake caliper, so that the brake pads are in close contact with the brake disc or brake drum, generating the necessary frictional force to achieve the deceleration or stop of the vehicle.

[0003] This process not only requires precise mechanical coordination but also various seals and return springs to ensure the normal operation of the brake cylinder assembly. The seals ensure the tightness of the hydraulic system and prevent brake fluid leakage, while the return springs ensure that the braking system can quickly return to its original state after releasing the pedal, preparing for the next braking. The design and manufacture of the entire brake cylinder assembly must follow strict safety standards because any minor defect may lead to a weakening of the braking effect or even cause serious safety accidents.

[0004] Therefore, the brake cylinder assembly is not just a simple mechanical device; it is one of the key factors ensuring driving safety. During the design and maintenance of an automobile, the inspection and maintenance of the brake cylinder assembly are crucial to ensure that it can reliably perform its functions at critical moments and protect the safety of drivers and passengers.

[0005] In the drum brake wheel cylinder for automotive hydraulic braking with the announcement number CN202215644U, it includes a cylinder block. In the inner holes of the cylinder block, a clearance adjusting piston and a rear brake wheel cylinder piston are respectively arranged. The clearance adjusting piston and the rear brake wheel cylinder piston are arranged opposite to each other. Sealing grooves are provided at the necks of the opposite faces, and leather rings are installed on the sealing grooves. Two radial grooves are respectively opened on the clearance adjusting piston and the rear brake wheel cylinder piston, and the grooves are in arc transition. Shields are installed between the cylinder block and the clearance adjusting piston and between the cylinder block and the rear brake wheel cylinder piston. The present utility model changes the surface structure of the piston, reduces the friction between the piston and the inner wall of the cylinder block. Even if the brake fluid contains tiny particles, it will not cause phenomena such as brake failure or locking, improving the service life of the brake pump. However, the parts of this technical device are miscellaneous and the integration degree is low. It needs to be assembled manually through welding or threaded connection, with high costs and time-consuming and laborious. Secondly, the shields connecting the clearance adjusting piston, the rear brake wheel cylinder piston and the cylinder block of this technical device are fixed by plugging. In this way, when increasing or decreasing the clearance of the clearance adjusting piston and the rear brake wheel cylinder piston, there may be a problem that the shield is pushed through and falls off. Summary of the Utility Model

[0006] The present utility model provides a brake cylinder assembly, which solves the problems in the prior art that the parts of the device are miscellaneous, the integration degree is low, it needs to be assembled manually through welding or threaded connection, with high costs and time-consuming and laborious.

[0007] Secondly, it solves the problem in the prior art that the shields connecting the clearance adjusting piston, the rear brake wheel cylinder piston and the cylinder block of the device are fixed by plugging. In this way, when increasing or decreasing the clearance of the clearance adjusting piston and the rear brake wheel cylinder piston, there may be a problem that the shield is pushed through and falls off.

[0008] In order to achieve the above object, the present utility model adopts the following technical solutions:

[0009] A brake cylinder assembly includes a cylinder block, which is of a tubular structure. A front piston assembly and a rear piston arranged coaxially and opposite to each other are respectively inserted at both ends inside it. Between the edges of the front piston assembly and the rear piston at both ends of the cylinder block and the outer periphery of the cylinder block, they are connected by a first leather sleeve and a second leather sleeve. One ends of the first leather sleeve and the second leather sleeve are fixedly embedded with the cylinder block, and limit pieces are fixed on the outer peripheries of the first leather sleeve and the second leather sleeve.

[0010] Preferably, the front piston assembly is cylindrical. One end is located in the middle inside the cylinder block, and the other end is located at the edge of one end of the cylinder block. A leather ring groove is provided on the outer periphery of the end of the front piston assembly located inside the cylinder block, and a contact disc is further provided at the end of the front piston assembly near the contact disc.

[0011] Preferably, an annular groove is provided on the outer periphery of the end of the front piston assembly located at the edge of one end of the cylinder block, and an adjusting screw is fixed on the end face. The cross-section of the annular groove is circular, and a first leather sleeve is embedded in the annular groove.

[0012] Preferably, the cross-section of the annular groove is a semicircle to three-quarters of a circle. One end of the first leather sleeve is a spherical end, and the other end is a rectangular end. The first leather sleeve is elastic. The spherical end is a sphere, and the rectangular end is a rectangular block. The spherical end and the rectangular end are integrally formed by elastic connection.

[0013] Preferably, an adjusting wheel assembly is also sleeved between the adjusting screw and the front piston assembly, and a gasket is provided at the end of the contact disk near the adjusting wheel assembly.

[0014] Preferably, the rear piston is cylindrical. One end is located in the middle of the cylinder block opposite to the front piston assembly, and the other end is located at the edge of the other end of the cylinder block. A contact disk and a leather ring groove matching the front piston assembly are provided at the end of the rear piston near the middle of the cylinder block.

[0015] Preferably, a tension spring is fixed to one end of the rear piston. The other end of the tension spring is fixed to one end of a gap adjusting plate. The gap adjusting plate cooperates with the rear piston. A fixing screw is also fixed in the middle of the gap adjusting plate. The fixing screw connects the gap adjusting plate and the cylinder block.

[0016] Preferably, the contact disk is of a frustum of a cone structure, and the bottom surfaces of the contact disks provided on the front piston assembly and the rear piston are opposite to each other.

[0017] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0018] For the brake cylinder assembly of the present utility model, some small part structures are directly assembled to the cylinder block and integrally formed, which simplifies the structure of the brake cylinder assembly, improves its integration degree, and reduces the assembly cost and time. The unique first leather sleeve in this embodiment can be matched with the annular groove and accommodated in the annular groove through the unique spherical end design. The advantage of this design is that the spherical end can freely rotate in the annular groove, so that its angle can be adjusted to adapt to different working requirements. This flexibility enables the front piston assembly to better adapt to the movement and change of the cylinder block during the working process, and solves the problem that the shield in the prior art may be punctured and fall off. By specially treating the surfaces of the cylinder block and the piston, the service life of the brake cylinder assembly is improved. A series of sensors are equipped, including a pressure sensor, which enhances the safety performance of the braking system. In addition, the contact disk is designed into a unique frustum of a cone structure. The design of this frustum of a cone can not only further enhance the contact area between the front piston assembly and the rear piston, thereby improving the contact effect, but also further limit the displacement of the leather ring, reduce the probability of falling off, and play an auxiliary fixing effect, thus improving the overall working efficiency and reliability. Brief Description of the Drawings

[0019] Figure 1 It is a schematic cross-sectional view of the overall structure of an embodiment of the present utility model.

[0020] Figure 2 It is Figure 1 the schematic A-A cross-sectional view in

[0021] Figure 3 It is a schematic front view of the overall structure of an embodiment of the present utility model.

[0022] Figure 4 It is Figure 3 the schematic B-B cross-sectional view in

[0023] In the figure: adjustment wheel assembly 1, first leather sleeve 2, spherical end 2.1, rectangular end 2.2, gasket 3, front piston assembly 4, leather ring 5, cylinder block 6, rear piston 7, second leather sleeve 8, bleed screw 9, screw guard 10, dust plug 11, clearance adjusting plate 12, tension spring 13, fixing screw 14, pressing piece 15, adjusting screw 16, limiting piece 17, contact disc 18, leather ring groove 19. Detailed Description of the Preferred Embodiment

[0024] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0025] In the drum brake wheel cylinder for automotive hydraulic braking in the prior art, it includes a cylinder block. In the inner holes of the cylinder block, a clearance adjusting piston and a rear brake wheel cylinder piston are respectively provided. The clearance adjusting piston and the rear brake wheel cylinder piston are arranged opposite to each other. Sealing grooves are provided at the necks of the opposite faces, and leather rings are installed on the sealing grooves. Two radial grooves are respectively formed on the clearance adjusting piston and the rear brake wheel cylinder piston, and the grooves are in arc transition. Shields are installed between the cylinder block and the clearance adjusting piston and between the cylinder block and the rear brake wheel cylinder piston. The present utility model changes the surface structure of the piston, reduces the friction between the piston and the inner wall of the cylinder block. Even if the brake fluid contains tiny particles, it will not cause phenomena such as brake failure or locking, improving the service life of the brake pump. However, the parts of this technical device are miscellaneous and the integration degree is low. It needs to be assembled manually through welding or threaded connection, with high costs and time-consuming and laborious. Secondly, the shields connecting the clearance adjusting piston, the rear brake wheel cylinder piston and the cylinder block adopt an insertion and fixation method. And this method may cause the problem that the shield is pierced and falls off when increasing or decreasing the clearance of the clearance adjusting piston and the rear brake wheel cylinder piston. To solve the above problems, this embodiment is thus provided.

[0026] Referring to Figures 1 to 4 this embodiment, Figure 1 is the schematic cross-sectional view of the overall structure of this embodiment, Figure 3 is the schematic front view of the overall structure of this embodiment. This embodiment is a brake cylinder assembly, which mainly consists of a cylinder block with a tubular structure. Inside this cylinder block, a front piston assembly and a rear piston are respectively inserted coaxially and oppositely at both ends. In order to ensure the sealing performance and connection reliability between the edges of the front piston assembly and the rear piston at both ends of the cylinder block and the outer periphery of the cylinder block, leather sleeve one and leather sleeve two are used for connection. One ends of leather sleeve one and leather sleeve two are both fixedly embedded with the cylinder block, ensuring their stability during the working process. In addition, in order to further enhance the performance and safety of the brake cylinder assembly, limit pieces are fixed on the outer peripheries of leather sleeve one and leather sleeve two. The function of these limit pieces is to prevent leather sleeve one and leather sleeve two from moving excessively during the braking process, thus ensuring the normal operation of the brake cylinder assembly. Through this design, the brake cylinder assembly not only has good sealing performance, but also has high stability and reliability.

[0027] In this embodiment, a guiding device is further provided inside the cylinder block of the brake cylinder assembly to ensure the coaxiality of the front piston assembly and the rear piston during the movement process. The guiding device consists of two guiding rings, which are respectively fixed on the outer sides of the front piston assembly and the rear piston. An appropriate gap is left between the guiding rings and the inner wall of the cylinder block to ensure that the piston will not generate excessive frictional force during the movement process, thereby improving the working efficiency of the brake cylinder assembly.

[0028] In order to further improve the service life of the brake cylinder assembly, the inner wall of the cylinder block and the piston surface are both specially treated to reduce wear. For example, the inner wall of the cylinder block can adopt the chrome plating process, while the piston surface can be coated with a wear-resistant coating. These treatments not only increase the surface hardness but also enhance its corrosion resistance, thus ensuring that the brake cylinder assembly can maintain a good working state under various harsh working conditions.

[0029] In addition, the brake cylinder assembly is also equipped with a pressure sensor for real-time monitoring of the pressure change in the braking system. The pressure sensor is installed at an appropriate position on the cylinder block and is connected to the brake control unit through a wire. When the pressure in the braking system exceeds the set value, the pressure sensor will send a signal to the brake control unit, thereby triggering safety protection measures to ensure the braking safety of the vehicle.

[0030] For the convenience of maintenance and replacement, the cylinder block of the brake cylinder assembly is connected to other components in the vehicle braking system through quick connectors. This design enables the brake cylinder assembly to be quickly disassembled and replaced when a fault occurs, greatly shortening the maintenance time and improving the vehicle's usage efficiency.

[0031] In summary, through reasonable structural design and material selection, the brake cylinder assembly of this embodiment not only improves the braking performance and safety but also takes into account the convenience of maintenance and the extension of service life. This kind of brake cylinder assembly has a wide application prospect in various vehicle braking systems.

[0032] In this embodiment, the front piston assembly presents a cylindrical structure. One end of it is located at the middle position inside the cylinder block, while the other end extends to the edge of one end of the cylinder block. Specifically, a leather ring groove is designed on the outer peripheral part of one end of the front piston assembly inside the cylinder block. This leather ring groove is used to accommodate and fix the leather ring to ensure the sealing effect. In addition, a contact disc is specially designed at the end position of the front piston assembly near the contact disc. The shape of this contact disc is a truncated cone structure, and its main function is to provide a contact surface between the front piston assembly and the rear piston to ensure the tight fit between the two.

[0033] Furthermore, the rear piston is also a cylindrical structure. One end of it is located in the middle of the cylinder block and corresponds to the front piston assembly. The other end of the rear piston is located at the edge of the other end of the cylinder block. To ensure the sealing performance and structural integrity, a contact disc and a leather ring groove matching the front piston assembly are also provided at the end of the rear piston near the middle of the cylinder block. These leather ring grooves are also used to sleeved with leather rings to achieve a good sealing effect. It should be noted that the bottom surfaces of the contact discs provided on the front piston assembly and the rear piston are opposite, which means that they can be in close contact during operation, thus ensuring the sealing and stability of the entire system.

[0034] In summary, by separately providing a leather ring groove and a contact disc on the front piston assembly and the rear piston, this embodiment can effectively achieve the sealing inside the cylinder block, ensuring the normal operation of the system. At the same time, the design of the conical frustum structure of the contact disc can further enhance the contact area between the front piston assembly and the rear piston, thereby improving the contact effect. In addition, the design of the conical frustum can further limit the displacement of the leather ring, reduce the probability of detachment, and play an auxiliary fixing effect, thus improving the overall working efficiency and reliability.

[0035] In the front piston assembly, it is designed to be on the outer periphery of the end at one end edge of the cylinder block. To achieve this design, a circular groove is particularly provided on the outer periphery of the end. The cross-sectional shape of this circular groove is circular, and its purpose is to accommodate and fix a leather sleeve one. To ensure that the leather sleeve one can better adapt to the shape of the circular groove, the cross-section of the circular groove is designed to be between 1 / 2 and 3 / 4 of a circle, which can provide sufficient space to ensure the stability and functionality of the leather sleeve one.

[0036] The design of the leather sleeve one is very unique. One end of it is designed as a spherical end, while the other end is a rectangular end. This design enables the leather sleeve one to have good elasticity and can adapt to different working environments and conditions. The spherical end is in the shape of a complete sphere, and the rectangular end is a rectangular block. These two ends are elastically connected to form a whole, enabling the leather sleeve one to maintain stability and flexibility during use.

[0037] The design of the spherical end enables it to match the circular groove and be accommodated in the circular groove. The advantage of this design is that the spherical end can freely rotate in the circular groove, thereby adjusting its angle to adapt to different working requirements. This flexibility enables the front piston assembly to better adapt to the movement and changes of the cylinder block during operation.

[0038] The rectangular end is fixed on the outer periphery of the cylinder block to ensure that the leather sleeve one does not displace or fall off during operation. To further ensure the stability and reliability of the front piston assembly, an adjustment screw is fixed on the end face. The function of the adjustment screw is to adjust the position and angle of the front piston assembly by rotation, thereby ensuring its perfect fit with the cylinder block.

[0039] To achieve this adjustment function, an adjustment wheel assembly is also sleeved between the adjustment screw and the front piston assembly. The adjustment wheel assembly is provided with a gasket at the end near the contact disc. The function of the gasket is to reduce the friction between the adjustment wheel assembly and the contact disc, making the adjustment process smoother and more precise. This design not only improves the adjustment efficiency but also ensures the stability and reliability during the adjustment process.

[0040] One end of the rear piston is fixedly installed with a tension spring. The other end of this tension spring is connected to one end of the clearance adjusting plate, forming a tight connection relationship. The clearance adjusting plate and the rear piston fit very tightly, ensuring the precise operation of the mechanical device. In addition, a fixing screw is specially designed in the middle of the clearance adjusting plate. The function of this fixing screw is to firmly connect the clearance adjusting plate to the cylinder block. To further enhance the connection stability, a pressing piece is arranged between the fixing screw and the cylinder block. This pressing piece plays a role of buffering and fixing, ensuring the stability and reliability of the entire mechanical device during operation. Finally, the fixing screw is firmly fixed on the cylinder block by passing through the pressing piece, thereby ensuring the structural stability and long-term durability of the entire device.

[0041] On the outer peripheral part of the cylinder block, two through holes arranged side by side are specially designed. These two through holes penetrate the entire cylinder block, enabling the external and internal parts of the cylinder block to communicate. Among these two through holes, one through hole is specially used to install the air release screw. The end of the air release screw is specially equipped with a screw guard to ensure its safety and stability during use. The other through hole is used to fix the dust plug to prevent external dust and impurities from entering the inside of the cylinder block, thereby keeping the inside of the cylinder block clean and enabling normal operation. The design of these two through holes not only ensures the sealing performance of the cylinder block but also guarantees its reliability and safety during use. The air release screw and the dust plug are both tightly connected to the cylinder block, ensuring their stability and reliability during operation.

[0042] The beneficial effects produced by this embodiment are:

[0043] In this embodiment, the brake cylinder assembly directly assembles some small parts onto the cylinder block and forms them integrally, simplifying the structure of the brake cylinder assembly, improving its integration level, and reducing the assembly cost and time. The unique leather sleeve one in this embodiment can match with the annular groove and be accommodated in the annular groove through its unique spherical end design. The advantage of this design is that the spherical end can rotate freely in the annular groove, so that its angle can be adjusted to adapt to different working requirements. This flexibility enables the front piston assembly to better adapt to the movement and changes of the cylinder block during operation, solving the problem that the shield in the prior art may be punctured and fall off. By specially treating the surfaces of the cylinder block and the piston, the service life of the brake cylinder assembly is improved. A series of sensors are equipped, including a pressure sensor, enhancing the safety performance of the braking system. In addition, the contact disc is designed into a unique frustum of a cone structure. This frustum of a cone design can not only further enhance the contact area between the front piston assembly and the rear piston, thereby improving the contact effect, but also further limit the displacement of the leather ring, reducing the probability of falling off, playing an auxiliary fixing effect, and thus improving the overall working efficiency and reliability.

[0044] The manufacturing technical requirements of this embodiment are as follows:

[0045] 1. When assembling, the inner surface of the cylinder block and the parts inside the cylinder block should be coated with assembly oil;

[0046] 2. There should be no scratches on the piston, cylinder block, and leather ring, and no foreign objects should be mixed into the cylinder block;

[0047] 3. Other technical conditions shall follow Q / AJ 02;

[0048] 4. The working medium is D0T3 or D0T4;

[0049] 5. The maximum working hydraulic pressure is 10 MPa;

[0050] 6. Air pressure tightness: Introduce an air pressure of 0.5 ± 0.05 MPa through the liquid inlet hole, keep the pressure for 3 seconds, and the pressure drop shall not be greater than 5 KPa;

[0051] 7. Durability (continuous test in the test sequence):

[0052] 7.1 High-temperature durability: Temperature 100 °C, test times 125,000 times, no leakage, test frequency 1000 times / hour;

[0053] 7.2 Normal-temperature durability: Normal temperature, test times 130,000 times, no leakage, test frequency 1000 times / hour;

[0054] 7.3 Low-temperature durability: Temperature -40 °C, test times 125,000 times, no leakage, test frequency 600 times / hour.

[0055] Except for the above embodiments, within the scope disclosed in the claims and the specification of the present utility model, the technical features or technical data of the present utility model can be reselected and combined to form new embodiments, which should also be regarded as specific embodiments of the present utility model and within the protection scope of the present utility model.

Claims

1. A brake cylinder assembly, characterized in that: It includes a cylinder body, which is a tubular structure, and the front piston assembly and the rear piston are coaxially arranged opposite to each other at the two ends of the interior thereof. The edges of the front piston assembly and the rear piston at the two ends of the cylinder body are connected to the outer peripheral edge of the cylinder body by leather covers one and two. One ends of the leather covers one and two are embedded and fixed in the cylinder body, and the outer peripheries of the leather covers one and two are fixed with limiting plates.

2. The brake cylinder assembly according to claim 1, characterized in that: The front piston assembly is cylindrical, with one end located in the middle of the cylinder body and the other end located at the edge of one end of the cylinder body. A leather ring groove is provided on the outer periphery of the end of the front piston assembly located in the cylinder body, and a contact plate is also provided at the end of the front piston assembly close to the contact plate.

3. The brake cylinder assembly according to claim 2, characterized in that: The front piston assembly is provided with an annular groove on the outer periphery of the end at the edge of one end of the cylinder body, an adjustment screw is fixed on the end surface, the cross section of the annular groove is circular, and a leather cover is embedded in the annular groove.

4. The brake cylinder assembly according to claim 3, characterized in that: The cross-section of the annular groove is 1 / 2 to 3 / 4 of a circle, one end of the leather case is a spherical end, and the other end is a rectangular end. The leather case is elastic, the spherical end is a sphere, and the rectangular end is a rectangular block. The spherical end and the rectangular end are elastically connected and formed as one piece.

5. The brake cylinder assembly according to claim 3, characterized in that: An adjusting wheel assembly is sleeved between the adjusting screw and the front piston assembly, and a gasket is provided at the end of the adjusting wheel assembly close to the contact plate.

6. The brake cylinder assembly according to claim 4, characterized in that: The rear piston is cylindrical, with one end located in the middle of the cylinder body opposite to the front piston assembly, and the other end located at the edge of the other end of the cylinder body, and the end of the rear piston close to the middle of the cylinder body is provided with a contact plate and a leather ring groove matching the front piston assembly.

7. The brake cylinder assembly according to claim 6, characterized in that: A tension spring is fixed to one end of the rear piston, and one end of a gap adjustment plate is fixed to the other end of the tension spring. The gap adjustment plate cooperates with the rear piston. A fixing screw is also fixed to the middle of the gap adjustment plate, and the fixing screw connects the gap adjustment plate and the cylinder body.

8. The brake cylinder assembly according to claim 2, 5 or 6, characterized in that: The contact plate is a truncated cone structure, and the bottom surfaces of the contact plates provided on the front piston assembly and the rear piston are opposite to each other.

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