Brake actuator, brake system and vehicle

Abstract

The application relates to the technical field of vehicle manufacturing, and provides a brake actuating mechanism, a brake system and a vehicle. The brake actuating mechanism comprises a brake cylinder, a piston rod, a first piston and a second piston; the piston rod, the first piston and the second piston are arranged in the brake cylinder; the brake cylinder is connected with a brake oil passage of the vehicle, so that the oil liquid can drive the first piston and the second piston to move and press against first brake shoes and second brake shoes; the piston rod comprises a transmission part for receiving external driving, and a first part and a second part located on both sides of the transmission part; the first part is in threaded transmission cooperation with the first piston; the second part is in clearance fit with the second piston; when the piston rod is driven to rotate, the first piston presses against the first brake shoes, and the second piston can press against the second brake shoes. The brake actuating mechanism has high integration, reduces the setting cost and maintenance difficulty, and is beneficial to improving the overall quality of the brake.

Description

Technical Field

[0001] This application relates to the field of vehicle manufacturing technology, and in particular to a braking actuator, braking system and vehicle. Background Technology

[0002] Currently, electronic braking systems have become a development trend in vehicle braking systems. The most common product is the caliper-integrated electronic brake, also known as the disc EPB (Electrical Park Brake). However, disc RPBs are heavy, have high drag, and are expensive.

[0003] Therefore, drum brakes, also known as drum EPBs, are used in related technologies to improve the driving range of new energy vehicles, enhance vehicle performance and cost-effectiveness, and are more likely to improve dust emissions compared to disc EPBs. However, existing drum EPBs have a high degree of integration and structural stability during vehicle installation due to the large number of components in the actuator section, making maintenance difficult and hindering the overall improvement of brake quality. Utility Model Content

[0004] In view of this, this application aims to provide a braking actuator to improve the overall quality of the brake.

[0005] To achieve the above objectives, the technical solution of this application is implemented as follows:

[0006] A braking actuator, applied in a vehicle, includes a brake cylinder, and a piston rod, a first piston, and a second piston disposed within the brake cylinder;

[0007] The brake cylinder is connected to the brake fluid passage in the vehicle. Under the pressure of the oil in the brake fluid passage, the first piston and the second piston are driven to move and can respectively press against the first brake shoe and the second brake shoe.

[0008] The piston rod includes a transmission part for receiving external drive, and a first part and a second part located on both sides of the transmission part. The first part is threadedly engaged with the first piston, and the second part is clearance-engaged with the second piston.

[0009] When the piston rod is driven to rotate, it can drive the first piston to press against the first brake shoe, and under the reverse force of the first brake shoe, the piston rod can push the second piston to press against the second brake shoe.

[0010] Furthermore, one end of the piston rod extends into the piston chamber of the first piston, and the other end of the piston rod extends into the piston chamber of the second piston; both ends of the piston rod are arc-shaped.

[0011] Furthermore, the piston rod is provided with a connecting channel; the inner cavity of the brake cylinder, the piston cavity of the first piston, and the piston cavity of the second piston are connected through the connecting channel.

[0012] Furthermore, the connecting channel includes a sub-channel connecting each of the piston chambers, and a through hole connecting the sub-channel and the inner cavity of the brake cylinder; the sub-channel is arranged through the piston rod along the axial direction, and the through hole is arranged through the piston rod in the radial direction.

[0013] Furthermore, both the first part and the second part are provided with the through hole.

[0014] Furthermore, it also includes a rotatable caliper gear located inside the brake cylinder; the caliper gear is coaxially sleeved on the piston rod, the caliper gear meshes with the transmission part, and the caliper gear is used to connect to an external drive device.

[0015] Furthermore, the axial length L1 of the piston rod, the axial length L2 of the piston chamber of the first piston, the axial length L3 of the piston chamber of the second piston, and the axial length L4 of the pump gear satisfy the following relationship: L2 + L3 + L4 < L1.

[0016] Furthermore, the first piston is provided with a first anti-rotation boss, and the piston rod is provided with a second anti-rotation boss. When the piston rod is driven to rotate and move the first piston away from the first brake shoe, the second anti-rotation boss can abut against the first anti-rotation boss to limit the movement stroke of the first piston.

[0017] Compared with related technologies, this application has the following advantages:

[0018] (1) The braking actuator described in this application can realize the parking brake and the driving brake of the vehicle through the cooperation of the piston rod, the first piston and the second piston, to meet the user's needs. The first piston and the second piston are driven by the piston rod to realize the parking brake and the driving brake for different situations, which makes the overall integration of the braking actuator high, the number of parts small, reduces the installation cost and maintenance difficulty, and helps to improve the overall quality of the brake.

[0019] (2) By inserting the first piston and the second piston into the two ends of the piston rod respectively, it is convenient to drive the first piston and the second piston to press against the corresponding brake shoes during braking, thus ensuring braking reliability. Moreover, both ends of the piston rod are arc-shaped, which reduces the contact area between the piston rod end and the piston inner wall, which is conducive to the disengagement of the piston rod end and helps to reduce energy loss.

[0020] (3) By setting up the connecting channel, the oil in the brake cylinder can enter the piston rod and enter the piston chamber of the first piston and the second piston through the connecting channel, as well as fill the inner cavity of the brake cylinder, which helps to drive the first piston and the second piston to press against the corresponding brake shoes.

[0021] (4) By combining the through hole and the sub-channel, it is not only convenient for the oil in the brake cylinder to enter the corresponding piston chamber and fill the inner cavity of the brake cylinder, and to make the oil pressure on the first piston and the second piston the same, but also to temporarily store a part of the oil in the connecting channel after the braking operation, which helps to reduce the amount of oil used in the next braking.

[0022] (5) By providing through holes on both the first and second parts, the oil can better enter the corresponding piston chamber and fill the inner cavity of the brake cylinder, thereby driving the first and second pistons to move, which is convenient for design and implementation.

[0023] (6) The piston rod is connected by the meshing of the pump gear and the transmission part, which makes it easy to drive the piston rod to rotate by an external drive device. The structure is simple and easy to process and assemble.

[0024] (7) By ensuring that the axial length L1 of the piston rod, the axial length L2 of the piston chamber of the first piston, the axial length L3 of the piston chamber of the second piston, and the axial length L4 of the pump gear satisfy the following condition: L2+L3+L4<L1, the required extension stroke of the piston rod during the axial movement of the first piston and the second piston can be met. This also helps to ensure the helical engagement of the piston rod and the first piston and avoids the problem of the first piston excessively returning and colliding with the pump gear, which is beneficial to the design and implementation.

[0025] (8) By cooperating with the first anti-rotation boss and the second anti-rotation protrusion, it is possible to prevent the first piston from moving too far away from the first brake shoe, thereby ensuring the stability of the first piston return stroke.

[0026] This application also proposes a braking system including a brake actuator assembly; the brake actuator assembly includes a drive unit and a brake actuator mechanism as described above connected to the drive unit.

[0027] This application also proposes a vehicle including the braking system described above.

[0028] The braking system and vehicle described in this application are equipped with the aforementioned braking actuator, which has the same beneficial effects as the prior art, and therefore will not be described in detail here. Attached Figure Description

[0029] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0030] Figure 1 This is a schematic diagram of the braking actuator described in the embodiments of this application;

[0031] Figure 2 This is a cross-sectional view of the braking actuator described in the embodiments of this application;

[0032] Figure 3 This is a schematic diagram of the piston rod of the braking actuator described in the embodiments of this application;

[0033] Figure 4 This is a schematic diagram of the structure of the first piston described in an embodiment of this application;

[0034] Figure 5 This is a schematic diagram of the service braking state of the braking actuator described in the embodiments of this application;

[0035] Figure 6 This is a schematic diagram of the parking brake state of the braking actuator described in the embodiments of this application;

[0036] Explanation of reference numerals in the attached figures:

[0037] 1. Brake cylinder;

[0038] 2. Piston rod;

[0039] 201. Transmission part; 202. First part; 203. Second part; 204. Second anti-rotation boss; 205. Connecting channel;

[0040] 2051, Sub-channel; 2052, Through-hole;

[0041] 3. First piston; 301. Second anti-rotation boss; 302. First limiting groove;

[0042] 4. Second piston; 401. Second limiting groove;

[0043] 5. Pump gear; 6. Drive unit. Detailed Implementation

[0044] To make the technical solution and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0045] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0046] Furthermore, it should be noted that in the description of this application, if terms such as "upper," "lower," "inner," or "outer" appear, indicating orientation or positional relationship, these are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation on this application. In addition, if terms such as "first" or "second" appear, they are also used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0047] Furthermore, in the description of this application, unless otherwise expressly defined, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application in light of the specific circumstances.

[0048] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0049] The present application will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures, and features in one embodiment may be advantageously incorporated into other embodiments.

[0050] The first aspect of this application provides a braking actuator applied to a vehicle braking system, mainly used to realize the braking action of the vehicle. The braking actuator of this embodiment, with its innovative structural design, can provide good braking effect when the vehicle is driving and parked, and improves the integration level of the braking actuator, which is conducive to improving the overall quality of the brake.

[0051] In related technologies, the most common product in vehicle braking systems is the integrated caliper electronic brake, also known as the disc EPB (Electrical Park Brake). However, disc EPBs are heavy, have high drag, and are expensive. Therefore, drum brakes, or drum EPBs, are used instead. Drum EPBs are beneficial for improving the driving range of new energy vehicles, enhancing vehicle performance and cost-effectiveness, and are a more promising product development trend in terms of dust emissions compared to disc EPBs.

[0052] However, when the existing drum-type EPB is installed in a vehicle, the actuator part has a large number of components and a low degree of integration. Furthermore, due to the large number of components, its structural stability is weak and its maintenance is difficult, which is not conducive to improving the overall quality of the brake.

[0053] In view of this, in order to overcome the shortcomings of the related technology, the braking actuator of this embodiment combines... Figures 1 to 6 As shown, the overall design includes a brake cylinder 1, a piston rod 2, a first piston 3, and a second piston 4 disposed within the brake cylinder 1.

[0054] The brake lever connects to the brake fluid passages in the vehicle. Under the pressure of the brake fluid in the passages, the first piston 3 and the second piston 4 can be driven to move, respectively pressing against the first brake shoe and the second brake shoe. The piston rod 2 includes a transmission part 201 for receiving external drive, and a first part 202 and a second part 203 located on both sides of the transmission part 201. The first part 202 is threadedly engaged with the first piston 3, and the second part 203 is clearance-fitted with the second piston 4.

[0055] When the piston rod 2 is driven to rotate, it can drive the first piston 3 to press against the first brake shoe, and under the reverse force of the first brake shoe, the piston rod 2 can push the second piston 4 to press against the second brake shoe.

[0056] Therefore, through the cooperation of piston rod 2, first piston 3 and second piston 4, the vehicle's parking brake and service brake can be realized to meet user needs. Moreover, by driving first piston 3 and second piston 4 respectively through piston rod 2 to realize parking brake and service brake for different situations, the overall integration of the brake actuator is high, the number of parts is small, the installation cost and maintenance difficulty are reduced, and the overall quality of the brake is improved.

[0057] Based on the above overall introduction, specifically regarding the braking actuator in this embodiment, as an exemplary implementation, combined with... Figure 1 and Figure 6 As shown, it is generally connected to the drive unit 6 in the vehicle's braking system and can perform service braking and parking braking actions under the drive of the drive unit 6.

[0058] The connection between the drive unit 6 and the brake actuator in the braking system of the above vehicles can be referenced from the connection between the drive unit 6 and the brake actuator in the braking system of existing vehicles (such as the form of being connected by transmission structure, etc.), and will not be described in detail here.

[0059] The connection method between the brake cylinder 1 in the above braking actuator and the brake oil passage in the vehicle can also refer to the connection method between the brake cylinder 1 and the brake oil passage in existing vehicles (such as pipeline connection, etc.), and will not be repeated here.

[0060] It is worth mentioning that drum brakes generally achieve braking action by having the brake shoes, driven by a brake actuator, press the brake friction pads against the brake drum. The first and second brake shoes mentioned above are conventional configurations in existing drum brakes (drum EPB), and their configurations can be referenced from the conventional configurations in existing drum brakes, so they will not be elaborated further here.

[0061] Continue to combine Figure 1 and Figure 2 As shown, in some exemplary embodiments, this embodiment may, for example, allow one end of the piston rod 2 to extend into the piston chamber of the first piston 3, and the other end of the piston rod 2 to extend into the piston chamber of the second piston 4. Both ends of the piston rod 2 are arc-shaped.

[0062] It is understandable that by inserting the two ends of the piston rod 2 into the first piston 3 and the second piston 4 respectively, it is convenient to drive the first piston 3 and the second piston 4 to press against the corresponding brake shoes during braking. Moreover, both ends of the piston rod 2 are arc-shaped, which reduces the contact area between the end of the piston rod 2 and the inner wall of the piston, which is conducive to the disengagement of the end of the piston rod 2 and helps to reduce energy loss.

[0063] In practical implementation, an arc-shaped surface is formed on the end of the piston rod 2. When the end of the piston rod 2 abuts against the inner wall of the piston cavity, the arc-shaped surface abuts against the inner wall of the piston cavity, so as to reduce the contact area between the end of the piston rod 2 and the inner wall of the piston cavity, and thus help the end of the piston rod 2 to disengage from the inner wall of the piston cavity with less energy.

[0064] Continue to combine Figures 1 to 3 As shown, in some exemplary embodiments, this embodiment may, for example, provide a communication channel 205 on the piston rod 2.

[0065] The inner cavity of the brake cylinder 1, the piston cavity of the first piston 3, and the piston cavity of the second piston 4 are connected by the connecting channel 205.

[0066] It is understandable that by setting the connecting channel 205, the oil in the brake cylinder 1 can enter the piston rod 2, and enter the piston chamber of the first piston 3 and the second piston 4 through the connecting channel 205, and fill the inner cavity of the brake cylinder 1, which helps to drive the first piston 3 and the second piston 4 to press against the corresponding brake shoes.

[0067] In practical implementation, the oil in the brake cylinder 1 can enter the piston chamber of the first piston 3 and the piston chamber of the second piston 4 through the connecting channel 205, and under the pressure of the oil, drive the first piston 3 and the second piston 4 to move axially.

[0068] Continue to combine Figures 1 to 3 As shown, in some exemplary embodiments, the piston rod 2 is provided with a connecting channel 205 as an example. In this embodiment, the connecting channel 205 may include a sub-channel 2051 and a through hole 2052.

[0069] The sub-channel 2051 is arranged through the piston rod 2 along the axial direction and connects to the corresponding piston cavity, while the through hole 2052 is arranged through the piston rod 2 in the radial direction and connects to the inner cavity of the brake cylinder 1 and the sub-channel 2051.

[0070] It is understandable that by using the through hole 2052 and the sub-channel 2051 together, not only can the oil in the brake cylinder 1 enter the corresponding piston chamber and fill the inner cavity of the brake cylinder 1, and make the oil pressure received by the first piston 3 and the second piston 4 the same, but also a portion of the oil can be temporarily stored in the connecting channel 205 after the braking operation, which helps to reduce the amount of oil used in the next braking.

[0071] In specific implementation, the oil in the inner cavity of the brake cylinder 1 can enter the sub-channel 2051 through the through hole 2052, and then enter the corresponding piston cavity through the sub-channel 2051. During the stroke of the piston rod 2, the inner cavity of the brake cylinder 1 is always connected to the through hole 2052 of the piston rod 2.

[0072] Continue to combine Figures 1 to 3 As shown, in some exemplary embodiments, the connecting channel 205 includes a through hole 2052 and a sub-channel 2051. In this embodiment, for example, the first part 202 and the second part 203 of the piston rod 2 may both be provided with through holes 2052.

[0073] It is understandable that by providing through holes 2052 on both the first part 202 and the second part 203, the oil can better enter the corresponding piston chamber, thereby driving the first piston 3 and the second piston 4 to move, which facilitates the design and implementation.

[0074] In practical implementation, when the oil in the brake cylinder 1 enters the connecting channel 205 from the inner cavity of the brake cylinder 1, it can enter the connecting channel 205 from two places simultaneously through the through hole 2052 provided in the first part 202 and the through hole 2052 provided in the second part 203, and then merge in the connecting channel 205 before entering the corresponding piston chamber. This can shorten the time for the oil to enter the piston chamber and improve the efficiency of the brake cylinder 1 in driving the oil into the piston chamber.

[0075] Continue to combine Figure 1 , Figure 2 and Figure 6 As shown, in some exemplary embodiments, this embodiment may, for example, include a brake actuator that further includes a spool gear 5 that rotates within the brake cylinder 1.

[0076] The pump gear 5 is coaxially sleeved on the piston rod 2, and the pump gear 5 is meshed with the transmission part 201. The pump gear 5 is also used to connect the external drive device 6.

[0077] It is understandable that the piston rod 2 is easily driven to rotate by the external drive device 6 through the meshing connection of the pump gear 5 and the transmission part 201. The structure is simple and easy to process and assemble.

[0078] In practical implementation, the transmission part 201 is a toothed protrusion located in the middle of the piston rod 2, and the inner ring of the pump gear 5 is provided with a toothed groove that matches the toothed part, with the toothed protrusion meshing in the toothed groove. Of course, the connection between the transmission part 201 and the pump gear 5 can also refer to the existing connection between the pump gear 5 and the piston rod 2 (such as a spline connection), which will not be elaborated here.

[0079] In addition, in specific implementation, the above-mentioned pump gear 5 can also be connected to the external drive device 6 through a gear set. The gear set facilitates the transmission of power from the external drive device 6 to the pump gear 5, and then to the piston rod 2. This enables the sequential transmission of the driving force of the external drive device 6, improving the reliability of the driving force transmission.

[0080] Continue to combine Figures 1 to 3 As shown, in some exemplary embodiments, taking the brake cylinder 1 with a slave cylinder gear 5 as an example, this embodiment can, for example, make the axial length L1 of the piston rod 2, the axial length L2 of the piston chamber of the first piston 3, the axial length L3 of the piston chamber of the second piston 4, and the axial length L4 of the slave cylinder gear 5 satisfy: L2+L3+L4<L1.

[0081] It is understandable that by ensuring that the axial length L1 of piston rod 2, the axial length L2 of piston chamber of first piston 3, the axial length L3 of piston chamber of second piston 4, and the axial length L4 of pump gear 5 satisfy the condition L2+L3+L4<L1, the required extension stroke of piston rod 2 during the axial movement of first piston 3 and second piston 4 can be met. This also helps to ensure the helical engagement of piston rod 2 and first piston 3, and avoids the problem of first piston 3 excessively returning and colliding with pump gear 5, which is beneficial to design and implementation.

[0082] Continue to combine Figures 1 to 4 As shown, in some exemplary embodiments, this embodiment may, for example, provide a second anti-rotation boss 301 on the first piston 3 and a second anti-rotation boss 204 on the piston rod 2.

[0083] When the piston rod 2 is driven to rotate and move the first piston 3 away from the first brake shoe, the second anti-rotation boss 204 can abut against the first anti-rotation boss 301 to limit the movement stroke of the first piston 3.

[0084] It is understandable that the cooperation of the first anti-rotation boss 301 and the second anti-rotation protrusion 204 can prevent the first piston 3 from moving too far away from the first brake shoe, avoid the first piston 3 from colliding with the slave cylinder gear 5 and causing the problem of not being able to stop rotation and jamming, thereby ensuring the stability of the return stroke of the first piston 3.

[0085] In specific implementation, the first anti-rotation protrusion 301 is formed on the side of the first piston 3 near the middle of the piston rod 2, and the second anti-rotation protrusion 204 is formed on the side of the piston rod 2 near the first part 202. When the piston rod 2 rotates around its own axis, the second anti-rotation protrusion 204 can abut against the first anti-rotation protrusion 301 to limit the movement stroke of the first piston 3.

[0086] It should be noted that the first piston 3 is provided with a first limiting groove 302 that cooperates with the first brake shoe, and the second piston 4 is provided with a second limiting groove 401 that cooperates with the second brake shoe. Under the limiting cooperation of the first limiting groove 302 and the first brake shoe, the first piston 3 moves axially under the drive of the piston rod 2, and under the limiting cooperation of the second limiting groove 401 and the second brake shoe, the second piston 4 moves axially. The axial direction here is the axial direction of the piston rod 2 (the axial direction of the piston rod 2 is the same as or parallel to the axial direction of the first piston 3, the axial direction of the second piston 4, and the axial direction of the slave cylinder gear 5).

[0087] The aforementioned movement of the first piston 3 away from the first brake shoe is based on the consideration of convenient disassembly and assembly of the first brake shoe. That is, after the first limiting groove 302 disengages from the limiting engagement with the first brake shoe, it is convenient to disassemble and assemble the first brake shoe. In addition, since the first piston 3 and the piston rod 2 are threadedly engaged, it is only necessary to set an anti-rotation structure between the first piston 3 and the piston rod 2.

[0088] Combination Figure 1 , Figure 2 and Figure 5 As shown in the figure, when the braking actuator in this embodiment performs service braking, the oil in the brake oil passage of the vehicle enters the inner cavity of the brake cylinder 1, and enters the piston cavity of the first piston 3 and the piston cavity of the second piston 4 through the connecting channel 205, and fills the inner cavity of the entire brake lever 1. Under the pressure of the oil, the first piston 3 is pushed towards the first brake shoe and presses against the first brake shoe, and the second piston 4 is pushed towards the second brake shoe and presses against the second brake shoe. The movement of the first piston 3 and the second piston 4 is basically synchronized. At this time, due to the threaded transmission connection between the first piston 3 and the piston rod 2, the first piston 3 will move together with the piston rod 2.

[0089] Furthermore, combined Figures 1 to 4 ,as well as Figure 6 As shown, in this embodiment, when the brake actuator performs parking brake operation, the slave cylinder gear 5, driven by the external drive device 6, drives the piston rod 2 to rotate. Under the threaded transmission cooperation between the first part 202 and the first piston 3, the rotation of the piston rod 2 is converted into the movement of the first piston 3 along the axial direction of the piston rod 2 until the first piston 3 presses against the first brake shoe. Subsequently, the reaction force of the first brake shoe is transmitted to the piston rod 2 through the first piston 3. At this time, based on the key connection between the slave cylinder gear 5 and the piston rod 2, the piston rod 2 moves towards the second brake shoe until the end of the second part 203 abuts against the piston cavity of the second piston 4 and pushes the second piston 4 to press against the second brake shoe.

[0090] It is worth noting that, regarding the braking actuator of this embodiment, based on the above exemplary embodiments, in specific implementation, as a preferred embodiment, it is still composed of... Figures 1 to 6 As shown, it generally includes a brake cylinder 1.

[0091] The brake cylinder 1 is equipped with a piston rod 2, a first piston 3, and a second piston 4. The piston rod 2 includes a transmission part 201 for receiving external drive, and a first part 202 and a second part 203 located on both sides of the transmission part 201. The first part 202 is threadedly engaged with the first piston 3 and extends into the piston cavity of the first piston 3. The second part 203 is clearance-fitted with the second piston 4 and extends into the piston cavity of the second piston 4. Both ends of the piston rod 2 are arc-shaped.

[0092] The first piston 3 is provided with a second anti-rotation protrusion 301, the second piston 4 is provided with a second anti-rotation groove, the first part 202 of the piston rod 2 is provided with a second anti-rotation protrusion 204, the second part 203 of the piston rod 2 is provided with a second anti-rotation protrusion, the second anti-rotation protrusion 204 is slidably disposed in the second anti-rotation protrusion 301, and the second anti-rotation protrusion is slidably disposed in the second anti-rotation groove.

[0093] The brake cylinder 1 is connected to the brake fluid circuit in the vehicle, and the piston rod 2 is provided with a connecting channel 205. The connecting channel 205 includes a sub-channel 2051 connecting each piston chamber, and a through hole 2052 connecting the sub-channel 2051 and the inner cavity of the brake cylinder 1. The first part 202 and the second part 203 are both provided with through holes 2052.

[0094] The brake cylinder 1 is equipped with a rotatable slave cylinder gear 5, which is coaxially sleeved on the piston rod 2 and meshes with the transmission part 201. The slave cylinder gear 5 can also be connected to an external drive device 6. The axial length L1 of the piston rod 2, the axial length L2 of the piston chamber of the first piston 3, the axial length L3 of the piston chamber of the second piston 4, and the axial length L4 of the slave cylinder gear 5 satisfy the following relationship: L2 + L3 + L4 < L1.

[0095] In the preferred embodiment of the above braking actuator, the specific configuration and arrangement of the brake cylinder 1, piston rod 2, first piston 3 and second piston 4, etc., can still be referred to the descriptions in the above exemplary embodiments. Furthermore, in this preferred embodiment, the beneficial effects brought about by the design of the brake cylinder 1, piston rod 2, first piston 3 and second piston 4, etc., can also be referred to the descriptions in the above exemplary embodiments.

[0096] The braking actuator of this embodiment adopts the above design. Through the cooperation of piston rod 2, first piston 3 and second piston 4, the vehicle can realize parking brake and service brake to meet user needs. Moreover, by driving first piston 3 and second piston 4 respectively through piston rod 2 to realize parking brake and service brake for different situations, the overall integration of the braking actuator is high, the number of parts is small, the installation cost and maintenance difficulty are reduced, and the overall quality of the brake is improved.

[0097] An embodiment of the second aspect of this application provides a braking system applied to a vehicle, including a brake actuator assembly, the brake actuator assembly including a drive unit 6, and a brake actuator mechanism as described above connected to the drive unit 6.

[0098] In the braking system of this embodiment, the above-mentioned braking actuator serves as the action execution component of the braking system. It is usually connected to the downstream brake shoes and brake drum. Under the drive of the drive device 6, the braking actuator can drive the brake shoes to push the friction pads against the brake drum, thereby completing the braking action of the vehicle.

[0099] The braking system of this embodiment, through the setting of the braking actuator as described above, can realize the parking brake and service brake of the vehicle, meet the user's needs, and make the overall integration of the braking actuator high, with fewer parts, reducing the installation cost and maintenance difficulty, thus improving the overall quality of the braking system.

[0100] An embodiment of the third aspect of this application provides a vehicle having a braking actuator as described above.

[0101] In the vehicle of this embodiment, the above braking system serves as the vehicle's braking action implementation component. It is typically mounted on the vehicle's chassis and connected to the wheels via a brake actuator assembly. Under the drive of the drive device 6, the brake actuator can drive the brake shoes to push the friction pads against the brake drum mounted on the wheels, thereby achieving vehicle braking.

[0102] The vehicle in this embodiment, through the braking system set as described above, can realize parking braking and service braking, meet user needs, and make the overall integration of the braking actuator high, with fewer parts, reducing setup costs and maintenance difficulty, thus improving the overall quality of the vehicle.

[0103] The above descriptions are merely some embodiments of this application and are not intended to limit this application. The technical features or structures in the foregoing different embodiments can be arbitrarily combined to form other specific technical solutions as needed. For those skilled in the art, this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of the claims of this application.

Claims

1. A braking actuator, applied in a vehicle, characterized in that: Includes a brake cylinder (1), and a piston rod (2), a first piston (3), and a second piston (4) disposed in the brake cylinder (1); The brake cylinder (1) is connected to the brake oil passage in the vehicle. Under the pressure of the oil in the brake oil passage, the first piston (3) and the second piston (4) are driven to move and can respectively press against the first brake shoe and the second brake shoe. The piston rod (2) includes a transmission part (201) for receiving external drive, and a first part (202) and a second part (203) located on both sides of the transmission part (201). The first part (202) is threadedly engaged with the first piston (3), and the second part (203) is clearance-engaged with the second piston (4). When the piston rod (2) is driven to rotate, it can drive the first piston (3) to press against the first brake shoe, and under the reverse force of the first brake shoe, the piston rod (2) can push the second piston (4) to press against the second brake shoe.

2. The braking actuator according to claim 1, characterized in that: One end of the piston rod (2) extends into the piston chamber of the first piston (3), and the other end of the piston rod (2) extends into the piston chamber of the second piston (4); The ends of both ends of the piston rod (2) are arc-shaped.

3. The braking actuator according to claim 1, characterized in that: The piston rod (2) is provided with a connecting channel (205); The inner cavity of the brake cylinder (1), the piston cavity of the first piston (3), and the piston cavity of the second piston (4) are connected through the communication channel (205).

4. The braking actuator according to claim 3, characterized in that: The connecting channel (205) includes a sub-channel (2051) connecting each of the piston chambers, and a through hole (2052) connecting the sub-channel (2051) and the inner cavity of the brake cylinder (1). The sub-channel (2051) is arranged through the piston rod (2) along the axial direction, and the through hole (2052) is arranged through the piston rod (2) in the radial direction.

5. The braking actuator according to claim 4, characterized in that: Both the first part (202) and the second part (203) are provided with the through hole (2052).

6. The braking actuator according to claim 1, characterized in that: It also includes rotating the sub-pump gear (5) located inside the brake cylinder (1); The pump gear (5) is coaxially sleeved on the piston rod (2), the pump gear (5) meshes with the transmission part (201), and the pump gear (5) is used to connect to an external drive device.

7. The braking actuator according to claim 6, characterized in that: The axial length L1 of the piston rod (2), the axial length L2 of the piston chamber of the first piston (3), the axial length L3 of the piston chamber of the second piston (4), and the axial length L4 of the pump gear (5) satisfy the following condition: L2+L3+L4<L1.

8. The braking actuator according to any one of claims 1 to 7, characterized in that: The first piston (3) is provided with a first anti-rotation boss (301), and the piston rod (2) is provided with a second anti-rotation boss (204). When the piston rod (2) is driven to rotate and the first piston (3) is driven away from the first brake shoe, the second anti-rotation boss (204) can abut against the first anti-rotation boss (301) to limit the movement stroke of the first piston (3).

9. A braking system applied to a vehicle, characterized in that: Including the brake actuator assembly; The brake actuator assembly includes a drive unit (6) and a brake actuator according to any one of claims 1 to 8 connected to the drive unit (6).

10. A vehicle, characterized in that: Includes the braking system as described in claim 9.

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