Hydraulic drum brake, braking system and vehicle

Abstract

The utility model relates to a hydraulic drum brake, a braking system and a vehicle. On one hand, the hydraulic drum brake comprises a bottom plate, and a brake drum is arranged on the peripheral side of the bottom plate; the actuator assembly is mounted on the bottom plate; the hydraulic wheel cylinder assembly is mounted on the bottom plate and is opposite to the actuator; and the brake pad assembly is connected with the bottom plate and arranged between the actuator assembly and the hydraulic wheel cylinder assembly, and the brake pad assembly can abut against the brake drum under the action of the actuator assembly and / or the hydraulic wheel cylinder assembly. Stable braking force can be provided, and the braking efficiency is effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle braking, in particular to a hydraulic drum brake, a braking system and a vehicle. BACKGROUND

[0002] The braking system of a light truck is generally of the air pressure braking type or the hydraulic braking type.

[0003] In the related art, the air pressure braking system generally adopts a spring energy storage structure to achieve parking brake, and the air pressure system releases the air pressure of the parking cavity, and the energy storage spring fixes the rear wheel through the force to ensure that the vehicle will not slide due to external force. The hydraulic braking system generally adopts a mechanical pull wire type structure to achieve parking brake through a pull arm push plate structure, and the actuator is generally installed inside the central brake or rear drum brake on the transmission shaft.

[0004] However, the braking efficiency of the braking system of the light truck in the prior art is low. CONTENT OF THE UTILITY MODEL

[0005] Therefore, it is necessary to provide a hydraulic drum brake, a braking system and a vehicle capable of meeting the high-efficiency braking demand during driving in view of the problems in the prior art.

[0006] In a first aspect, the present application provides a hydraulic drum brake, which adopts the following technical scheme:

[0007] A hydraulic drum brake applied to a braking system of a vehicle, the hydraulic drum brake comprising:

[0008] a bottom plate, a brake drum being arranged on the periphery of the bottom plate;

[0009] an actuator assembly installed on the bottom plate;

[0010] a hydraulic pump assembly installed on the bottom plate and arranged opposite to the actuator;

[0011] a brake pad assembly connected to the bottom plate and arranged between the actuator assembly and the hydraulic pump assembly, the brake pad assembly being capable of abutting against the brake drum under the action of the actuator assembly and / or the hydraulic pump assembly.

[0012] In one of the embodiments, the actuator assembly comprises: a wedge block arranged towards the brake pad assembly; and a guide groove sleeved on the outside of the wedge block.

[0013] In one of the embodiments, the hydraulic pump assembly comprises: a pump body, an oil inlet and an oil outlet of the pump body being respectively communicated with a hydraulic master pump in the vehicle; and a push rod connected to the pump body and arranged towards the brake pad assembly.

[0014] In one of the embodiments, the brake pad assembly comprises:

[0015] a first brake shoe disposed on a first side of the actuator assembly and the hydraulic pump assembly;

[0016] a second brake shoe disposed on a second side of the actuator assembly and the hydraulic pump assembly, the first side and the second side being opposite to each other.

[0017] In one embodiment, the outer arc surface of the first brake shoe and the second brake shoe is provided with a friction plate.

[0018] In one embodiment, the hydraulic drum brake further comprises a return spring, a first end of the return spring being connected to the outer arc surface of the first brake shoe, and a second end of the return spring being connected to the outer arc surface of the second brake shoe.

[0019] In one embodiment, the return spring comprises:

[0020] a first return spring disposed close to the actuator assembly;

[0021] a second return spring disposed close to the hydraulic pump assembly, the second return spring being parallel to the first return spring.

[0022] In one embodiment, further comprising a pressing member connected to the brake shoe assembly, for pressing the brake shoe assembly against the bottom plate.

[0023] In a second aspect, the present application provides a brake system, comprising the hydraulic drum brake according to the first aspect, and a spring energy storage air chamber connected to the actuator assembly in the hydraulic drum brake through a connecting rod.

[0024] In a third aspect, the present application provides a vehicle comprising the brake system according to the second aspect.

[0025] The hydraulic drum brake, the brake system and the vehicle, wherein the hydraulic drum brake comprises a base plate, a brake drum is arranged on the periphery of the base plate; an actuator assembly is mounted on the base plate; a hydraulic pump assembly is mounted on the base plate and is arranged opposite to the actuator; a brake shoe assembly is connected to the base plate and is arranged between the actuator assembly and the hydraulic pump assembly, and the brake shoe assembly can abut against the brake drum under the action of the actuator assembly and / or the hydraulic pump assembly. In the application, the interaction between the hydraulic pump assembly and the actuator assembly is fully utilized, in the driving brake process, the hydraulic pump assembly is used to drive the brake shoe assembly to open outward, and the actuator assembly acts as a fulcrum at this time to ensure the stability of the brake shoe assembly and the balanced distribution of the brake force; in the parking brake process, the actuator assembly is used as the main driving element to drive the brake shoe assembly to open outward, and the hydraulic pump assembly does not work at this time and becomes the fulcrum of the brake shoe assembly. The cooperation of the hydraulic pump assembly, the actuator assembly and the brake shoe assembly ensures the reliability of the hydraulic drum brake under different working conditions, so that the hydraulic drum brake can provide stable brake force and effectively improve the brake efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 FIG. 1 is a structural schematic view of the base plate in an embodiment;

[0027] Figure 2 FIG. 2 is a side view of the hydraulic drum brake in an embodiment;

[0028] Figure 3 FIG. 3 is a structural schematic view of the hydraulic drum brake in an embodiment;

[0029] Figure 4 FIG. 4 is a sectional view of the hydraulic drum brake in an embodiment.

[0030] BRIEF DESCRIPTION OF DRAWINGS

[0031] 1, base plate; 11, brake drum; 2, hydraulic pump assembly; 3, return spring; 31, first return spring; 32, second return spring; 4, pressing element; 5, brake shoe assembly; 51, first brake shoe; 52, second brake shoe; 6, actuator assembly; 7, connecting rod. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned purposes, features and advantages of the application more obvious and easy to understand, the specific embodiments of the application will be described in detail below with reference to the drawings. In the following description, many specific details are set forth in order to provide a thorough understanding of the application. However, the application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the application, so the application is not limited to the specific embodiments disclosed below.

[0033] In the description of the application, it should be understood that, if there are these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0034] In addition, if there are these terms "first", "second", these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the application, if the term "multiple" appears, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise explicitly specified.

[0035] In this application, unless otherwise explicitly specified and limited, if there are terms "installation", "connection", "connection", "fixation" and the like, these terms should be broadly understood. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0036] In this application, unless otherwise explicitly specified and limited, if there are similar descriptions such as "on" or "under" the first feature on the second feature, the meaning can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" of the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" of the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0037] It is to be noted that when an element is referred to as being "on" or "connected to" another element, it can be directly on the other element or intervening elements can also be present. In addition, the term "connected" can refer to physical or wired connections or it can refer to wireless connections in which signals can be passed between devices. As used herein, the terms "vertical", "horizontal", "upper", "lower", "left", "right", and the like, are merely used for the purpose of illustration and are not intended to be limiting.

[0038] The application will be further described in detail below with reference to the accompanying drawings. Figures 1-4 The application will be further described in detail below with reference to the accompanying drawings.

[0039] Figure 1 A structure diagram of a bottom plate in an embodiment of the application is shown; Figure 2 A side view of a hydraulic drum brake in an embodiment of the application is shown; Figure 3 A structure diagram of a hydraulic drum brake in an embodiment of the application is shown; Figure 4 A sectional view of a hydraulic drum brake in an embodiment of the application is shown.

[0040] Referring to Figures 1 to 4 The hydraulic drum brake provided by the embodiment of the application includes a bottom plate 1, a brake drum 11 arranged on the periphery of the bottom plate 1; an actuator assembly 6 mounted on the bottom plate 1; a hydraulic pump assembly 2 mounted on the bottom plate 1 and arranged opposite to the actuator; a brake shoe assembly 5 connected to the bottom plate 1 and arranged between the actuator assembly 6 and the hydraulic pump assembly 2, the brake shoe assembly 5 being capable of abutting against the brake drum 11 under the action of the actuator assembly 6 and / or the hydraulic pump assembly 2.

[0041] The actuator assembly 6, the hydraulic pump assembly 2 and the brake shoe assembly 5 are all arranged on the top of the bottom plate 1, and Figure 1 In the view shown, the actuator assembly 6 is mounted on the upper side of the bottom plate 1, and the hydraulic pump assembly 2 is mounted on the lower side of the bottom plate 1.

[0042] For the hydraulic drum brake, the brake drum 11 is arranged on the periphery of the top of the bottom plate 1, the brake drum 11 is a high-strength cast iron or alloy cast cylindrical part, the inner wall of which is precisely machined to form a smooth and wear-resistant friction contact surface. The actuator assembly 6, the hydraulic pump assembly 2 and the brake shoe assembly 5 are accommodated in the cavity formed by the bottom plate 1 and the brake drum 11. In the process of vehicle driving, the brake drum 11 rotates synchronously with the wheel, and when the brake shoe assembly 5 is forced to open under the action of the actuator assembly 6 and / or the hydraulic pump assembly 2, the friction plate in the brake shoe assembly 5 tightly abuts against the inner wall of the brake drum 11 to generate a friction torque, thereby realizing the braking of the whole vehicle.

[0043] The whole vehicle braking includes the service braking condition and the parking braking condition. In the service braking condition, the driving force is provided by the hydraulic pump assembly 2, the hydraulic pump assembly 2 pushes the brake pad assembly 5, so that the brake pad assembly 5 is in close contact with the inner wall of the brake drum 11, thereby generating friction force to realize vehicle deceleration or parking. In this process, the actuator assembly 6 acts as a fulcrum, and the brake pad assembly 5 works in the master-slave shoe structure, which can improve the braking force and braking effect.

[0044] In the parking braking condition, the actuator assembly 6 is responsible for pushing the brake pad assembly 5 to make it closely contact with the brake drum 11 to generate friction force to realize vehicle parking. At this time, the hydraulic pump assembly 2 acts as a fulcrum for the brake pad assembly 5. Similarly, this arrangement makes the brake pad assembly 5 still belong to the master-slave shoe structure, which ensures the reliability and stability of the parking braking.

[0045] The above-mentioned hydraulic drum brake comprises a bottom plate 1, a brake drum 11 arranged on the side of the bottom plate 1, an actuator assembly 6 installed on the bottom plate 1, a hydraulic pump assembly 2 installed on the bottom plate 1 and arranged opposite to the actuator, and a brake pad assembly 5 connected with the bottom plate 1 and arranged between the actuator assembly 6 and the hydraulic pump assembly 2. The brake pad assembly 5 can abut against the brake drum 11 under the action of the actuator assembly 6 and / or the hydraulic pump assembly 2. In this application, the interaction between the hydraulic pump assembly 2 and the actuator assembly 6 is fully utilized. In the service braking, the hydraulic pump assembly 2 is used to dominate the braking process to push the brake pad assembly 5 to open outward, and the actuator assembly 6 acts as a fulcrum at this time to ensure the stability of the brake pad assembly 5 and the balanced distribution of the braking force. In the parking braking, the actuator assembly 6 is used as the main driving element to push the brake pad assembly 5 to open outward, and the hydraulic pump assembly 2 does not work at this time and becomes the fulcrum of the brake pad assembly 5. The cooperation of the hydraulic pump assembly 2, the actuator assembly 6 and the brake pad assembly 5 ensures the reliability of the hydraulic drum brake in different conditions, so that the hydraulic drum brake can provide stable braking force and effectively improve the braking efficiency.

[0046] In an exemplary embodiment, the provided actuator assembly 6 comprises a wedge block arranged towards the brake pad assembly 5, and a guide groove sleeved outside the wedge block.

[0047] The wedge is wedge-shaped with a wide top and a narrow bottom. During braking by the actuator assembly 6 acting on the brake shoe assembly 5, the actuator assembly 6 is pushed by external force to move the wedge along the guide groove towards the brake shoe assembly 5, and then abuts against the brake shoe assembly 5 to push the brake shoe assembly 5 to open outward, thereby achieving parking brake. Due to the self-locking feature of the wedge structure, the brake shoe assembly 5 can be maintained in the clamped state without continuously applying external force in the brake holding state. In the service brake state, the actuator assembly 6 does not actively provide driving force, but acts as a fulcrum of the brake shoe assembly 5 to assist the brake shoe assembly 5 to work in the leading and following shoe mode.

[0048] Optionally, the actuator assembly 6 is further provided with a reset spring which can be installed at the bottom or side of the wedge. When the external force is removed, the wedge is pulled back to the initial position, and the brake shoe assembly 5 is reset and separated from the brake drum 11. In the reset state, there is a certain gap between the actuator assembly 6 and the brake shoe assembly 5 to avoid unnecessary friction and energy loss, and to ensure that there is no residual braking force in the normal driving state of the vehicle.

[0049] The actuator assembly 6 provided in the embodiment effectively converts the input external force into thrust by relying on the inclined surface structure of the wedge, thereby achieving stable and reliable parking brake function, ensuring efficient brake force output, and having lower energy loss and good self-locking feature.

[0050] In an exemplary embodiment, the hydraulic sub-pump assembly 2 includes a pump body, an oil inlet and an oil outlet of the pump body being communicated with a hydraulic master pump in the vehicle, and a push rod connected with the pump body and arranged towards the brake shoe assembly 5.

[0051] The hydraulic sub-pump assembly 2 drives the movement of a piston in the pump body based on hydraulic pressure. During service braking, such as when the driver steps on the brake pedal, the hydraulic oil in the hydraulic master pump enters the pump body of the hydraulic sub-pump from the oil inlet of the hydraulic sub-pump through the pipeline, pushes the push rod to move towards the brake shoe assembly 5, and then abuts against the brake shoe assembly 5 to push the brake shoe assembly 5 to open outward. After the brake is released, the hydraulic oil flows back to the hydraulic master pump from the oil outlet of the hydraulic sub-pump assembly 2, and the push rod returns to the initial position under the pressure in the hydraulic sub-pump assembly 2, and the brake shoe assembly 5 is reset and separated from the brake drum 11. Similarly, in the reset state, there is a certain gap between the hydraulic sub-pump assembly 2 and the brake shoe assembly 5 to avoid unnecessary friction and energy loss, and to ensure that there is no residual braking force in the normal driving state of the vehicle.

[0052] In an exemplary embodiment, the brake shoe assembly 5 includes a first brake shoe 51 arranged at a first side of the actuator assembly 6 and the hydraulic sub-pump assembly 2, and a second brake shoe 52 arranged at a second side of the actuator assembly 6 and the hydraulic sub-pump assembly 2, the first side being opposite to the second side.

[0053] In Figure 3 In the view shown, the first side is the left side and the second side is the right side, Figure 3 In the view shown, the first side is the left side and the second side is the right side,

[0054] In the view shown, the first side is the left side and the second side is the right side,

[0055] In one possible implementation, the outer arc surface of the first brake shoe 51 and the second brake shoe 52 is provided with a friction plate.

[0056] In one possible implementation, the outer arc surface of the first brake shoe 51 and the second brake shoe 52 is provided with a friction plate.

[0057] When the hydraulic pump assembly 2 is driven by hydraulic oil to push the first brake shoe 51 and / or the second brake shoe 52 to open, the force conditions of the first brake shoe 51 and the second brake shoe 52 can be different, and the brake shoe assembly 5 forms a leading shoe brake structure. Figure 3 In the view shown, the brake drum 11 rotates clockwise in the forward direction of the vehicle, and the second brake shoe 52 becomes the leading shoe, with the fulcrum at the actuator assembly 6. When the friction force acts on the brake drum 11, the second brake shoe 52 will be subjected to a thrust in the direction of rotation, making it more closely adhere to the brake drum 11. At this time, the first brake shoe 51 becomes the trailing shoe, and since the fulcrum is still at the actuator assembly 6, the friction force will not be further enhanced, so the braking force is smaller. Also exemplarily, the brake drum 11 rotates counterclockwise in the backward direction of the vehicle, and the first brake shoe 51 becomes the leading shoe, and the second brake shoe 52 becomes the trailing shoe, and the force mode is adjusted.

[0058] When the actuator assembly 6 is driven by external force to push the first brake shoe 51 and / or the second brake shoe 52 to open, the force conditions of the first brake shoe 51 and the second brake shoe 52 can be different, forming a leading and following shoe structure. At this time, the hydraulic pump becomes the fulcrum of the first brake shoe 51 and the second brake shoe 52. The force mode of the first brake shoe 51 and the second brake shoe 52 is similar to that when only the hydraulic pump works, and the brake shoe assembly 5 still forms a leading shoe and a following shoe braking structure.

[0059] When the hydraulic pump assembly 2 and the actuator assembly 6 are simultaneously actuated, the hydraulic pump assembly 2 and the brake assembly both exert force on the first brake shoe 51 and the second brake shoe 52 to push the first brake shoe 51 and the second brake shoe 52 to open outward. In this case, the first brake shoe 51 and the second brake shoe 52 both become leading shoes in the rotation direction, and the brake shoe assembly 5 forms a double-leading-shoe braking structure.

[0060] In the embodiment, when the hydraulic pump assembly 2 or the actuator assembly 6 is actuated alone to brake, the brake shoe assembly 5 forms a leading and following shoe braking structure; when the hydraulic pump assembly 2 and the actuator assembly 6 are simultaneously actuated to brake, the brake shoe assembly 5 forms a double-leading-shoe braking structure. In this way, the braking force range of the hydraulic drum brake can be effectively expanded, and the hydraulic pump assembly 2 or the actuator assembly 6 can be selected to brake alone or simultaneously to expand the application range of the hydraulic drum brake, and to provide sufficient braking force during braking.

[0061] In an exemplary embodiment, the hydraulic drum brake further comprises a return spring 3, a first end of the return spring 3 being connected to an outer arc surface of the first brake shoe 51, and a second end of the return spring 3 being connected to an outer arc surface of the second brake shoe 52.

[0062] The return spring 3 can play a resetting role after braking is released, so that the first brake shoe 51 and the second brake shoe 52 quickly return to the initial position, ensuring that the hydraulic drum brake does not leave residual braking torque and avoiding the occurrence of drag phenomenon. One end of the return spring 3 is hooked in a fixed hole of the first brake shoe 51, and the other end is hooked in a corresponding hole of the second brake shoe 52, so that the first brake shoe 51 and the second brake shoe 52 always maintain a close-together state without external force, ensuring that the first brake shoe 51 and the second brake shoe 52 quickly reset after braking is released, and restoring to the normal gap with the brake drum 11.

[0063] Optionally, the return spring 3 can be a spiral tension spring made of high-strength alloy steel, which is subjected to heat treatment and surface corrosion prevention treatment to ensure that it still has sufficient elasticity and durability under high stress, high temperature and complex working conditions.

[0064] In a possible implementation, the return spring 3 includes: a first return spring 31 arranged close to the actuator assembly 6; and a second return spring 32 arranged close to the hydraulic pump assembly 2, the second return spring 32 being parallel to the first return spring 31.

[0065] When the actuator assembly 6 performs the braking process, the first return spring 31 is stretched, and after the braking is completed, the first return spring 31 drives the first brake shoe 51 and the second brake shoe 52 to reset; when the hydraulic pump assembly 2 performs the braking process to push the first brake shoe 51 and the second brake shoe 52 to open, the second return spring 32 is stretched, and after the hydraulic pressure disappears, the second return spring 32 rebounds to reset the first brake shoe 51 and the second brake shoe 52.

[0066] In this embodiment, the first return spring 31 and the second return spring 32 arranged in parallel ensure that the first brake shoe 51 and the second brake shoe 52 always maintain a balanced and symmetrical movement track during the resetting process, avoid the deviation of the force direction, and prevent the first brake shoe 51 and the second brake shoe 52 from being inclined in the angle, which causes uneven resetting and further abnormal wear or even affects the braking effect, thereby improving the overall reliability and durability.

[0067] In a possible implementation, the hydraulic drum brake further includes: a pressing member 4 connected to the brake shoe assembly 5 and used to press the brake shoe assembly 5 against the bottom plate 1.

[0068] Optionally, the number of the pressing members 4 corresponds to the number of the brake shoes in the brake shoe assembly 5, one pressing member 4 is arranged in the middle of the first brake shoe 51, and one pressing member 4 is arranged in the middle of the second brake shoe 52. When the brake shoe assembly 5 is subjected to the braking torque, the brake shoe assembly 5 may have a certain deviation or rotation tendency, and the pressing member 4 provides additional support at this time to limit the axial and radial movement of the first brake shoe 51 and the second brake shoe 52 in the normal state, so as to ensure that the first brake shoe 51 and the second brake shoe 52 always maintain the correct position during the braking and resetting processes, and make the first brake shoe 51 and the second brake shoe 52 expand outward along the correct track, while providing support to optimize the force distribution and ensure uniform force, and reduce the braking instability.

[0069] In combination Figures 1 to 4 , the hydraulic drum brake provided in an embodiment of the present application is applied to the braking system of a vehicle, and the hydraulic drum brake includes:

[0070] a bottom plate 1, the bottom plate 1 being provided with a brake drum 11 on the side thereof;

[0071] an actuator assembly 6 mounted on the bottom plate 1, the actuator assembly 6 including: a wedge block arranged towards the brake shoe assembly 5; and a guide groove arranged outside the wedge block.

[0072] The hydraulic pump assembly 2 is installed on the base plate 1 and is arranged opposite to the actuator, and the hydraulic pump assembly 2 comprises: a pump body, an oil inlet and an oil outlet of the pump body are communicated with a hydraulic master pump in the vehicle; a push rod connected with the pump body and arranged towards the brake shoe assembly 5.

[0073] The brake shoe assembly 5 is connected with the base plate 1 and arranged between the actuator assembly 6 and the hydraulic pump assembly 2, and the brake shoe assembly 5 can abut against the brake drum 11 under the action of the actuator assembly 6 and / or the hydraulic pump assembly 2. The brake shoe assembly 5 comprises: a first brake shoe 51 arranged on a first side of the actuator assembly 6 and the hydraulic pump assembly 2; a second brake shoe 52 arranged on a second side of the actuator assembly 6 and the hydraulic pump assembly 2, the first side and the second side being opposite; and a friction plate arranged on an outer arc surface of the first brake shoe 51 and the second brake shoe 52.

[0074] The return spring 3 has a first end connected to the outer arc surface of the first brake shoe 51 and a second end connected to the outer arc surface of the second brake shoe 52. The return spring 3 comprises: a first return spring 31 arranged close to the actuator assembly 6; and a second return spring 32 arranged close to the hydraulic pump assembly 2, the second return spring 32 being parallel to the first return spring 31.

[0075] The pressing member 4 is connected with the brake shoe assembly 5 and used for pressing the brake shoe assembly 5 against the base plate 1.

[0076] In an embodiment of the present application, a brake system is provided, which comprises the hydraulic drum brake provided in the above embodiments and a spring energy storage type air chamber, and the spring energy storage type air chamber is connected to the actuator assembly 6 in the hydraulic drum brake through the connecting rod 7.

[0077] In the embodiment, a through hole is arranged on the actuator assembly 6 of the hydraulic drum brake; a first end of the connecting rod 7 is connected to the spring energy storage type air chamber, and a second end of the connecting rod 7 passes through the through hole and is connected to the base plate 1.

[0078] The spring energy storage type air chamber promotes the actuator assembly 6 through the connecting rod 7, so as to provide sufficient parking efficiency for the actuator assembly 6.

[0079] In an embodiment of the present application, a vehicle is provided, which comprises the brake system provided in the above embodiments.

[0080] In the description of the present application, the description of the terms “some embodiments”, “other embodiments”, and the like means that the specific features, structures, materials or characteristics described in connection with the embodiments or examples are contained in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily mean the same embodiment or example.

[0081] Any technical features in the above embodiments can be combined, and for the sake of brevity, not all possible combinations are described above, however, as long as the combinations do not conflict with each other, they should be considered to be within the scope of the present disclosure.

[0082] The above embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the application. It should be pointed out that for ordinary skilled persons in the art, some modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A hydraulic drum brake, characterized in that, The hydraulic drum brake, used in a vehicle braking system, comprises: A base plate, wherein a brake drum is provided on the periphery of the base plate; The actuator assembly is mounted on the base plate; A hydraulic pump assembly is mounted on the base plate and is disposed opposite to the actuator; A brake pad assembly is connected to the base plate and disposed between the actuator assembly and the hydraulic pump assembly. The brake pad assembly is capable of abutting against the brake drum under the action of the actuator assembly and / or the hydraulic pump assembly.

2. The hydraulic drum brake according to claim 1, characterized in that, The actuator assembly includes: a wedge block disposed toward the brake pad assembly; and a guide groove sleeved on the outside of the wedge block.

3. The hydraulic drum brake according to claim 1, characterized in that, The hydraulic sub-pump assembly includes: a pump body, the pump body having an oil inlet and an oil outlet respectively connected to the hydraulic master pump in the vehicle; and a push rod connected to the pump body and positioned toward the brake pad assembly.

4. The hydraulic drum brake according to claim 1, characterized in that, The brake pad assembly includes: The first brake shoe is disposed on the first side of the actuator assembly and the hydraulic pump assembly; The second brake shoe is disposed on the second side of the actuator assembly and the hydraulic pump assembly, with the first side and the second side opposite to each other.

5. The hydraulic drum brake according to claim 4, characterized in that, Friction pads are provided on the outer arc surfaces of the first brake shoe and the second brake shoe.

6. The hydraulic drum brake according to claim 4, characterized in that, The hydraulic drum brake further includes a return spring, the first end of which is connected to the outer arc surface of the first brake shoe, and the second end of which is connected to the outer arc surface of the second brake shoe.

7. The hydraulic drum brake according to claim 6, characterized in that, The return spring includes: The first return spring is located near the actuator assembly; The second return spring is located near the hydraulic pump assembly and is parallel to the first return spring.

8. The hydraulic drum brake according to claim 1, characterized in that, Also includes: A clamping element, connected to the brake pad assembly, is used to press the brake pad assembly onto the base plate.

9. A braking system, characterized in that, Including the hydraulic drum brake as described in any one of claims 1-8, and: A spring-loaded air chamber is connected to the actuator assembly in the hydraulic drum brake via a connecting rod.

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

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