Brake, drive axle assembly and vehicle

Abstract

The invention relates to a brake, a drive axle assembly and a vehicle, the brake comprises a shell, a fixing base located in the shell space of the shell and connected to the shell, and a piston in sliding connection with the fixing base, and a brake oil cavity used for containing brake oil is formed between the fixing base and the piston; according to the technical scheme, the volume of the brake oil cavity can be adjusted through the sliding connection formed by the fixed seat and the piston, so that the brake oil cavity has different oil quantities, the brake can generate different braking forces, and according to the technical scheme, the oil quantities in the brake oil cavity are adjusted according to the relative position between the piston and the fixed seat; the brake can generate different braking forces, switching of braking modes of a vehicle is achieved, meanwhile, the structure of the brake is simple, the assembly efficiency of the whole structure can be improved, and the heat dissipation performance is good.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a brake and drive axle assembly and a vehicle. Background Art

[0002] As brake devices for braking an automobile, disc brake devices such as floating type and opposed piston type are widely used because they are excellent in heat dissipation and can fine-tune power during driving.

[0003] In the prior art, the brake piston or the driving piston is controlled separately to apply the braking force to the brake member. However, this method uses two types of pistons to apply the braking force to the brake member separately, which has a complex structure and is difficult to assemble. Summary of the invention

[0004] The embodiments of the present application provide a brake and drive axle assembly and a vehicle, which reduce the structural complexity and at least partially solve the above-mentioned technical problems.

[0005] According to a first aspect of the present application, a brake is provided, comprising:

[0006] A shell having an inner shell space;

[0007] A fixing seat, located in the shell inner space and connected to the shell body;

[0008] A brake piston is slidably connected to the fixing seat;

[0009] Wherein, a brake oil chamber for containing brake oil is formed between the fixing seat and the brake piston;

[0010] The brake oil chamber has at least a first oil volume and a second oil volume, so that the brake generates different braking forces.

[0011] Optionally, the oil amount is negatively correlated with the braking force.

[0012] Optionally, the oil volume is positively correlated with the volume of the brake oil chamber.

[0013] Optionally, the brake further comprises:

[0014] a brake member configured to stop the rotation of the brake member by friction;

[0015] An elastic member is used for biasing the brake piston to approach the brake member.

[0016] Optionally, the elastic member is configured as a spring.

[0017] Optionally, the different elastic members are arranged around the brake member on the same side of the brake piston.

[0018] Optionally, the brake further comprises:

[0019] A mounting seat, located in the shell inner space and coupled to the shell body;

[0020] The brake piston has: a central axis;

[0021] Wherein, the elastic member forms an axial movable connection with respect to the mounting seat along the central axis;

[0022] The brake piston is slidably connected relative to the mounting seat in an axial direction along the central axis.

[0023] Optionally, the mounting seat and the brake piston form a receiving space for receiving the elastic member;

[0024] Wherein, the brake oil chamber and the accommodating space are constructed as spaces that are not connected to each other.

[0025] Optionally, around the central axis, the radial surface of the mounting seat has:

[0026] The mounting portion is used to mount the elastic member.

[0027] Optionally, around the central axis, the radial surface of the brake piston has:

[0028] A connecting portion, used for mounting the elastic member;

[0029] Wherein, along the axial direction of the central axis, a first projection of the mounting portion on the central axis and a second axial projection of the connecting portion on the central axis at least partially overlap.

[0030] Optionally, the connecting portion and / or the mounting portion is configured as a groove structure.

[0031] Optionally, around the central axis, the mounting seat further has:

[0032] An oil through hole, used to guide lubricating oil to the space inside the shell;

[0033] Wherein, the oil through hole is formed on the radial surface of the mounting seat avoiding the mounting portion.

[0034] Optionally, the brake further comprises:

[0035] An oil pipeline is formed to the fixing seat;

[0036] The oil passage is communicated with the brake oil chamber, and the brake oil is introduced into or discharged from the brake oil chamber along the oil passage.

[0037] Optionally, the brake further comprises:

[0038] Axle shafts and brake spline bushings;

[0039] Wherein, the half shaft and the brake component are respectively dynamically coupled with the brake spline sleeve.

[0040] Optionally, around the central axis, the outer peripheral wall surface of the brake spline sleeve has:

[0041] The first type of oil passage is used to guide lubricating oil to the space inside the shell;

[0042] and / or

[0043] Around the central axis, the radial surface of the brake spline sleeve has:

[0044] The second type of oil passage is used to guide lubricating oil to the space inside the shell.

[0045] According to a second aspect of the present application, a drive axle assembly is provided, comprising the brake as described above.

[0046] According to a third aspect of the present application, a vehicle is also provided, comprising the drive axle assembly as described above.

[0047] The beneficial effect of the present application is that a brake with optimized structure is provided, thereby improving the performance of the drive axle assembly.

[0048] More specifically, some embodiments of the present application may produce the following specific beneficial effects:

[0049] The brake of the embodiment of the present application includes a shell and a fixed seat located in the shell space of the shell and connected to the shell, and a piston that is slidably connected to the fixed seat, wherein a brake oil chamber for accommodating brake oil is formed between the fixed seat and the piston. The volume of the brake oil chamber can be adjusted by utilizing the sliding connection formed by the fixed seat and the piston, so that there are different amounts of oil in the brake oil chamber, so that the brake can generate different braking forces. Through the above technical solution, the amount of oil in the brake oil chamber is adjusted according to the relative position between the piston and the fixed seat, so that the brake can generate different braking forces, thereby realizing the switching of the braking mode of the vehicle. At the same time, the brake has a simple structure, which is conducive to improving the assembly efficiency of the overall structure and good heat dissipation.

[0050] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0052] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same figure numbers represent the same parts in the following description.

[0053] Figure 1 is a schematic diagram of the overall structure of a drive axle assembly provided in an exemplary embodiment of the present application;

[0054] Figure 2 is an internal cross-sectional view of a drive axle assembly provided in an exemplary embodiment of the present application;

[0055] Figure 3 is a schematic cross-sectional structure diagram of a portion of a brake involved in a drive axle assembly provided in an exemplary embodiment of the present application;

[0056] Figure 4 yes Figure 3 A magnified schematic diagram of part A;

[0057] Figure 5 is a schematic structural diagram of a mounting base provided in an exemplary embodiment of the present application;

[0058] Figure 6 is a schematic structural diagram of a brake spline sleeve provided in an exemplary embodiment of the present application;

[0059] Figure 7 It is provided in the exemplary embodiment of the present application Figure 1 A schematic diagram of the structure at B in FIG.

[0060] Figure 8 is another cross-sectional structural schematic diagram of a portion of a brake involved in a drive axle assembly provided in an exemplary embodiment of the present application;

[0061] Fig. 9 yes Figure 8 A magnified schematic diagram of part C;

[0062] Description of reference numerals:

[0063] 10. Drive axle assembly;

[0064] 100. Brake;

[0065] 110, housing; 10a, space inside the housing; 10b, brake oil chamber; 10c, accommodation space;

[0066] 120, fixed seat;

[0067] 130, brake piston; 13a, central axis; 131, connecting portion;

[0068] 140, brake member; 141, friction plate; 142, steel plate; 143, guide pin; 144, reset member;

[0069] 14a, brake space;

[0070] 150. Elastic parts;

[0071] 160, mounting seat; 161, mounting portion; 16a, oil through hole;

[0072] 170, half shaft;

[0073] 180, brake spline sleeve;

[0074] 181, internal spline; 182, external spline;

[0075] 18a, first type oil passage; 18b, second type oil passage; 18c, third type oil passage;

[0076] 191. Brake oil pipe; 192. Sealing ring. DETAILED DESCRIPTION

[0077] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0078] refer to Figures 1 to 9 As shown, for the convenience of introduction, the upper, lower, left and right directions are adopted in the corresponding drawings to facilitate the introduction of the relative position relationship between the various parts in the present application, which should not be understood as a limitation on the absolute position.

[0079] Moreover, in the present application, the axial direction of the center axis 13a corresponds to the left-right direction, and the radial direction of the center axis 13a corresponds to the up-down direction. Here, the axial direction of the center axis 13a indicates the left-right direction only for the convenience of introducing the specific embodiments of the present application. There is no absolute corresponding relationship between the axial direction of the center axis 13a and the left-right direction. Similarly, there is no absolute corresponding relationship between the radial direction of the center axis 13a and the up-down direction.

[0080] The axial and radial directions of the central axis 13a of the present application are only used to express relative positional relationships. They only indicate approximate orientations rather than absolute geometric relationships.

[0081] According to the first aspect of the present application, reference Figures 1 to 9 The present application provides a brake 100 , including a housing 110 , a fixing seat 120 and a brake piston 130 .

[0082] The housing 110 has an inner space 10 a , the fixing seat 120 is located in the inner space 10 a , and the fixing member is coupled to the housing 110 .

[0083] The brake piston 130 is slidably connected to the fixing seat 120 .

[0084] A brake oil chamber 10 b for containing brake oil is formed between the fixing seat 120 and the brake piston 130 . The brake oil chamber 10 b contains a first amount of oil and a second amount of oil, so that the brake 100 generates different braking forces.

[0085] Through the above technical solution, the amount of oil in the brake oil chamber 10b is adjusted according to the relative position between the brake piston 130 and the fixed seat 120, so that the brake 100 can generate different braking forces and realize the switching of the vehicle's braking mode. At the same time, the brake 100 has a simple structure, which is conducive to improving the assembly efficiency of the overall structure and good heat dissipation.

[0086] It should be noted that in the present application, the brake oil chamber 10b formed between the brake piston 130 and the fixed seat 120 is utilized. By adjusting the relative position of the brake piston 130 with respect to the fixed seat 120, the volume of the brake oil chamber 10b is changed, so as to change the amount of oil in the brake oil chamber 10b, thereby achieving the effect of adjusting the magnitude of the braking force applied to the vehicle, thereby completing the switching of the vehicle's braking mode.

[0087] In some embodiments, the amount of oil in the brake oil chamber 10b is negatively correlated with the braking force, that is, the more oil there is in the brake oil chamber 10b, the smaller the braking force is, and the less oil there is, the greater the braking force is.

[0088] In some embodiments, the oil amount is positively correlated with the volume of the brake oil chamber 10b.

[0089] Specifically, regarding controlling the amount of oil in the brake oil chamber 10b, a driving oil pressure value, a parking brake oil pressure value and a service brake oil pressure value are preset first, and the driving oil pressure value is preset to H1, the parking brake oil pressure value is preset to H2, and the service brake oil pressure value is H3.

[0090] When the vehicle is running normally, the brake oil contained in the brake oil chamber 10b has a running oil pressure value of H1, and will act on the brake piston 130 to the right. At this time, the braking force acting on the vehicle is minimum, and the ideal braking force value is 0, and no braking force is generated on the vehicle.

[0091] It should be noted that when the vehicle is driving normally, the vertical distance between the surface of the brake piston 130 constituting the brake oil chamber 10b and the surface of the fixed seat 120 is not 0, and under ideal conditions, the oil pressure in the brake oil chamber 10b can act on the brake piston 130 to the right, so that the vertical distance between the surface of the brake piston 130 and the surface of the fixed seat 120 is maximized.

[0092] When the vehicle needs to brake, the brake oil in the brake oil chamber 10b is released to reduce the amount of oil in the brake oil chamber 10b. At the same time, the brake piston 130 moves to the left relative to the fixed seat 120, and the volume of the brake oil chamber 10b is reduced. At this time, the brake 100 generates braking force, and the vehicle is in braking mode.

[0093] Among them, the vehicle's braking modes include parking brake and service brake.

[0094] When parking brake is needed, the brake oil in the brake oil chamber 10b will be released first until the brake oil pressure of the brake oil is H2, H2 is less than H1, and the brake piston 130 moves to the left relative to the fixed seat 120. At this time, the braking force acting on the vehicle is maximum, and the application of parking brake force to the vehicle is completed, so that the vehicle switches to parking brake.

[0095] When service braking is required, the brake oil in the brake oil chamber 10b is released until the service brake oil pressure of the brake oil reaches H3, which is less than H1. The brake piston 130 moves to the left relative to the fixed seat 120. At this time, the braking force on the vehicle is not necessarily the maximum, but it is definitely not the minimum.

[0096] For example, when the vehicle switches from normal driving to service braking, the brake oil in the brake oil chamber 10b is released from the brake oil chamber 10b at a certain rate, so that the volume of the brake oil chamber 10b gradually decreases, and the oil pressure in the brake oil chamber 10b also gradually decreases to H3, completing the application of service braking force to the vehicle and realizing the vehicle switching to parking braking.

[0097] Among them, H3 can be equal to H2, and the braking force of the service brake is also the maximum at this time.

[0098] During the process of the brake 100 generating the braking force, the braking acceleration can be controlled by controlling the rate (flow rate) of releasing the brake oil from the brake oil chamber 10b.

[0099] In some embodiments, the brake 100 further includes a brake member 140 and an elastic member 150 .

[0100] The brake member 140 is configured to stop the rotation of the brake member 140 by friction force.

[0101] The elastic member 150 is used to bias the brake piston 130 toward the brake member 140 .

[0102] Exemplarily, by biasing the brake piston 130 toward the brake member 140 through the elastic member 150, the volume of the brake oil chamber 10b can be reduced and the brake oil in the brake oil chamber 10b has a tendency to be discharged from the brake oil chamber 10b, thereby reducing the oil pressure of the brake oil in the brake oil chamber 10b.

[0103] The brake fluid is configured to be introduced into or discharged from the brake oil chamber 10b.

[0104] When the vehicle is in braking mode, brake fluid is introduced into the brake oil chamber 10b. The amount of brake oil in the brake oil chamber 10b increases continuously, and the oil pressure of the brake oil also increases continuously and acts on the brake piston 130 to the right, overcoming the biasing force applied to the brake piston 130 by the elastic member 150, so that the brake piston 130 can move to the right relative to the fixed seat 120, thereby releasing the braking force on the vehicle, that is, releasing the braking mode of the vehicle.

[0105] When the vehicle is in normal driving mode, the brake fluid in the brake oil chamber 10b is discharged, and the amount of brake oil in the brake oil chamber 10b is continuously reduced, and the oil pressure of the brake oil is also continuously reduced, and the rightward pressure on the brake piston 130 is also reduced. At this time, the biasing force of the elastic member 150 to the left biasing the brake piston 130 can enable the brake piston 130 to move to the left relative to the fixed seat 120, so that the brake piston 130 is continuously approached to contact with the brake member 140, and the friction force applied by the brake piston 130 to the brake member 140 is used to achieve the application of braking force on the vehicle.

[0106] The brake piston 130 is biased toward the brake member 140 by the elastic member 150, and the brake oil in the brake oil chamber 10b is discharged to apply the braking force to the vehicle. The entire brake 100 is a normally closed brake 100, that is, the entire vehicle is closed without external energy input. The vehicle needs to be started and an external force is applied to the brake piston 130 to the right to cancel the friction between the brake piston 130 and the brake member 140, so that the vehicle's brakes can be released, which has high safety.

[0107] The service brake and parking brake of the brake 100 of the present application share the same brake piston 130, and rely on the elastic member 150 to provide a biasing force to bias the brake piston 130 toward the fixed seat 120 and introduce or discharge brake oil into the brake oil chamber 10b, so that the brake piston 130 contacts the brake member 140 to apply friction force, and the brake member 140 stops rotating, completing the braking of the vehicle.

[0108] Introducing brake oil into the brake oil chamber 10b causes the brake piston 130 to move rightward relative to the fixed seat 120, canceling the friction force applied by the brake piston 130 to the brake member 140, thereby releasing the braking force applied by the brake member 140 to the wheel hub member, thereby releasing the brakes of the vehicle. The structure is simple and the heat dissipation is good.

[0109] At the same time, since in the prior art, the brake oil chamber 10b formed between the service brake piston 130 and the fixing seat 120 is normally open, when the vehicle is in normal driving state, it is not necessary to rely on the oil pressure applied to the brake piston 130 by the brake oil to separate from the brake member 140, that is, it is not necessary to discharge the brake oil into the brake oil chamber 10b to release the brakes of the vehicle. On the contrary, it is necessary to introduce brake oil into the brake oil chamber 10b so that the service brake piston 130 can brake the vehicle. Therefore, the service brake piston 130 will not return completely, resulting in a drag brake phenomenon, which poses a great safety hazard. The brake 100 in the present application is normally closed, and the oil pressure value in the brake oil chamber 10b is the driving oil pressure value. When braking is required, the brake oil is quickly discharged from the brake oil chamber 10b, and the vehicle can be braked by reducing the oil pressure value, which effectively avoids the drag brake phenomenon caused by the inability to quickly introduce brake oil into the brake oil chamber 10b to achieve braking, and further improves the safety of the vehicle in emergency situations.

[0110] Moreover, the service brake and parking brake of the present application share a brake piston 130, which can also reduce the number of structural components of the entire brake 100. At the same time, since the service brake piston 130 and the components connected to the service brake piston 130 and the opened oil channels are omitted, some costs are saved, the permeability of the lubricating oil is better, the heat dissipation of the brake component 140 is improved, and the overall safety performance of the brake 100 is guaranteed.

[0111] The brake 100 of the present application can be provided with one or two brake pistons 130. The position of the brake piston 130 can be arranged on one side of the brake member 140 according to needs, and can also be arranged on both sides of the brake member 140. It is only necessary to share one brake piston 130 for the service brake and the parking brake. The structure and shape of the brake piston 130 are set according to actual use.

[0112] The brake piston 130 of the present application is constructed in a circular ring shape, which can increase the contact area with the brake member 140 and ensure the braking effect.

[0113] In some embodiments, reference Figures 1 to 9 The elastic member 150 is constructed as a spring, and of course it can also be other components that can rebound after being compressed, such as a disc spring. The spring has a better reset effect after being compressed, and can make the brake piston 130 return quickly.

[0114] In some embodiments, reference Figure 3 and Figure 5 Alternatively, different elastic members 150 may be arranged around the brake member 140 on the same side of the brake piston 130 .

[0115] By arranging the elastic member 150 around the brake member 140 on the same side of the brake piston 130, it can be ensured that in the same direction, the biasing force of the elastic member 150 located on the same brake piston 130 biasing the brake piston 130 toward the brake member 140 is consistent, and the return effect of the brake piston 130 toward the brake member 140 is good.

[0116] In some embodiments, reference Figure 4 The brake 100 further includes: a mounting seat 160 .

[0117] The mounting seat 160 is located in the inner shell space 10 a and is coupled to the housing 110 .

[0118] The brake piston 130 has a central axis 13 a.

[0119] The elastic member 150 forms an axial movable connection with the mounting seat 160 along the central axis 13 a , and the brake piston 130 forms an axial sliding connection with the mounting seat 160 along the central axis 13 a .

[0120] In some embodiments, reference Figure 8 The mounting seat 160 and the brake piston 130 form a receiving space 10 c, and the receiving space 10 c is used to receive the elastic member 150 .

[0121] The brake oil chamber 10b and the accommodating space 10c are constructed as mutually unconnected spaces, while the accommodating space 10c and the shell inner space 10a are constructed as mutually connected spaces. The brake oil chamber 10b and the shell inner space 10a are also constructed as mutually unconnected spaces.

[0122] The mounting seat 160 and the brake piston 130 form an accommodating space 10c, and the elastic member 150 is located in the accommodating space 10c. Part of the elastic member 150 is connected to the mounting seat 160, and part of it is connected to the brake piston 130. Since the mounting seat 160 is coupled to the housing 110, the elastic member 150 has a unidirectional biasing tendency to bias the brake piston 130 toward the brake member 140 after being squeezed, and the force transmission effect is good.

[0123] There are two sealing rings 192 spaced apart between the mounting seat 160 and the brake piston 130 , and a brake oil chamber 10 b is formed between the two sealing rings 192 , the mounting seat 160 and the brake piston 130 .

[0124] In some embodiments, reference Figure 8Around the central axis 13 a , the radial surface of the mounting seat 160 has a mounting portion 161 , and the radial surface of the brake piston 130 has a connecting portion 131 .

[0125] The mounting portion 161 is used to mount a portion of the elastic member 150 , and the connecting portion 131 is used to mount a portion of the elastic member 150 .

[0126] Exemplarily, the mounting portion 161 and the connecting portion 131 can form a receiving space 10c, and the elastic member 150 is disposed in the receiving space 10c, so that the elastic member 150 is stably connected between the mounting seat 160 and the brake piston 130 to ensure stable transmission of force.

[0127] In which, along the axial direction of the central axis 13a, a first projection of the mounting portion 161 on the central axis 13a and a second axial projection of the connecting portion 131 on the central axis 13a at least partially overlap.

[0128] For example, reference Figure 8 The radial cross-sectional areas of the mounting portion 161 and the connecting portion 131 are set to be the same. After the brake piston 130 and the mounting seat 160 are assembled, the mounting portion 161 and the connecting portion 131 are also arranged to face each other.

[0129] In some embodiments, the mounting portion 161 is configured as a slot structure, and the connecting portion 131 is configured as a slot structure.

[0130] In some embodiments, around the central axis 13a, the mounting seat 160 further has: an oil through hole 16a.

[0131] The oil through hole 16 a is used to guide lubricating oil to the inner space 10 a of the housing, wherein the oil through hole 16 a is formed on the radial surface of the mounting seat 160 avoiding the mounting portion 161 .

[0132] By opening the oil through hole 16a on the mounting seat 160, the lubricating oil can flow into the shell space 10a to lubricate the components in the shell space 10a, such as the brake piston 130, the mounting seat 160, the fixing seat 120 and the half shaft 170.

[0133] In some embodiments, the brake 100 further includes an oil pipeline.

[0134] An oil passage is formed to the fixing seat 120 , wherein the oil passage is communicated with the brake oil chamber 10 b , and the brake oil is introduced into or discharged from the brake oil chamber 10 b along the oil passage.

[0135] Specifically, a brake interface can be provided on the housing 110, and an opening is opened on the fixing seat 120 at a position corresponding to the brake oil chamber 10b, part of the opening is connected to the brake oil chamber 10b, and the other part of the opening is connected to the brake interface, and the opening serves as an oil passage.

[0136] A brake oil pipe 191 is provided, and part of the brake oil pipe 191 is connected to the brake interface so as to communicate with the brake oil chamber 10b, thereby completing the introduction or discharge of the brake oil in the brake chamber.

[0137] Among them, a valve is also provided on the brake oil pipe 191, and the valve is normally closed. The brake oil is introduced into the brake oil chamber 10b by controlling the opening and closing of the valve. When the brake oil needs to be discharged, the valve is opened, and the brake piston 130 is used to approach the brake member 140 to discharge the brake oil from the brake oil chamber 10b.

[0138] In some embodiments, reference Figure 6 and Figure 8 The brake 100 further includes: a brake spline sleeve 180 and a half shaft 170 .

[0139] The half shaft 170 and the brake member 140 are respectively coupled to the brake spline sleeve 180 to form a dynamic coupling.

[0140] Exemplarily, the brake member 140 includes a friction plate 141 , a steel plate 142 and a return member 144 .

[0141] Specifically, the brake spline sleeve 180 is provided with an inner spline 181 and an outer spline 182 , the friction plate 141 has an inner spline 181 , and the steel plate 142 is arranged around the half shaft 170 and forms a non-rotating connection with the friction plate 141 to serve as a friction pair for braking.

[0142] Specifically, a braking space 14a is formed between the fixed seat 120 and the shell 110, and the braking space 14a is constructed as an annular space. Part of the steel sheet 142 is located in the braking space 14a, and the part located in the braking space 14a is freely set. Different steel sheets 142 are connected in series by guide pins 143, and the reset member 144 is set around at least part of the guide pin 143.

[0143] The inner splines 181 of the brake spline sleeve 180 are coupled to the half shaft 170 , and the outer splines 182 of the brake spline sleeve 180 are connected to the inner splines 181 of the friction plate 141 .

[0144] When the vehicle 1 needs to be started, the oil is pumped into the brake oil chamber 10b, and the brake piston 130 compresses the elastic member 150 to the right, and at the same time separates the friction plate 141 and the steel plate 142, thereby releasing the parking brake;

[0145] When service braking is required, a certain volume of oil is released so that the hydraulic pressure is insufficient to offset the elastic force F0 applied by the elastic member 150 to the brake piston 130. The force F2 obtained by deducting the oil pressure F1 of the oil from the elastic force F0 of the elastic member 150 is used to act on the friction plate 141 and the steel plate 142, so that the friction plate 141 and the steel plate 142 are in contact and friction, thereby achieving a braking effect.

[0146] When the service brake is completed, the oil continues to be pumped into the brake oil chamber 10b. At this time, the liquid pressure F1' is greater than the elastic force F0. The force of F1' minus F0 is used to compress the elastic member 150. As the elastic member 150 is compressed, the brake pad and the friction plate 141 are separated, and the service brake is released. When the work is completed and the vehicle needs to be parked, the oil in the brake oil chamber 10b is reduced to the lowest value (which can be consistent with the atmospheric pressure). At this time, the elastic force F0 is all used to compress the friction plate 141 and the steel plate 142, thereby playing the role of parking brake.

[0147] It should be noted that the elastic force of the elastic member 150 is always kept to the left and acts on the brake piston 130 .

[0148] In some embodiments, around the central axis 13 a , the outer peripheral wall surface of the brake spline sleeve 180 has a first type of oil passage 18 a and a second type of oil passage 18 b .

[0149] The first type of oil passage 18a is used to guide the lubricating oil to the shell inner space 10a, and the second type of oil passage 18b is used to guide the lubricating oil to the shell inner space 10a, so as to lubricate the brake member 140, the mounting seat 160 and the brake piston 130 in the shell inner space 10a.

[0150] It should be noted that the first type of oil passage 18a and the second type of oil passage 18b may not be provided on the actuating spline sleeve at the same time. Only one of the two is sufficient. The lubrication effect is better if both exist at the same time.

[0151] This application describes the working process of the brake by way of example:

[0152] During braking, the oil pressure in the brake oil chamber 10b is released, and the elastic member 150 pushes the brake piston 130 to move in the direction of compressing the friction plate 141 and the steel plate 142. The friction plate 141 and the steel plate 142 generate a braking torque after being compressed. The braking torque finally reaches the wheel through the spline of the friction plate 141, the brake spline sleeve 180, the half shaft 170, and the first and second stage reducers, providing braking force for the wheel.

[0153] When the oil in the brake oil chamber 10b is released to a certain extent and reaches a preset oil pressure value, the maximum braking force is generated.

[0154] When braking force is not needed, the brake oil enters the brake oil chamber 10b from the brake oil pipe 191 and the brake interface, moving the brake piston 130 in the direction of the compression spring, so that the friction plate 141 and the steel plate 142 are separated, and the braking force is released.

[0155] When parking is required, the brake oil in the brake oil chamber 10b is also discharged, and the friction plate 141 and the steel plate 142 are compressed by the spring to generate the parking brake force. The brake spline sleeve 180 here is used to improve the lubrication effect. Referring to the figure, a first type of oil passage 18a is arranged on the outer side of the brake spline sleeve 180, and a second type of oil passage 18b is arranged on the inner side. The axes of the first type of oil passage 18a and the second type of oil passage 18b are both arranged parallel to the central axis 13a to improve the lubrication and heat dissipation effects of the friction plate 141 and the steel plate 142.

[0156] A third type of oil passage 18 c is opened on the outer peripheral wall surface of the brake spline sleeve 180 along the radial direction of the brake spline sleeve 180 , which can further improve the lubrication and heat dissipation effects of the friction plate 141 and the steel plate 142 .

[0157] According to a second aspect of the present application, a drive axle assembly 10 is provided, comprising the brake 100 as described above.

[0158] The drive axle assembly 10 has all the beneficial effects of the above-mentioned brake 100 , which will not be described in detail in this application.

[0159] A brake 100 is disposed on both sides of the drive axle assembly 10 of the present application, and the braking effect is good.

[0160] According to a third aspect of the present application, a vehicle is also provided, comprising the drive axle assembly 10 as described above.

[0161] The vehicle has all the beneficial effects of the above-mentioned drive axle assembly 10, which will not be described in detail in this application.

[0162] The vehicle may be a fuel vehicle, a plug-in hybrid vehicle or a new energy vehicle, etc., and this application does not make any specific limitation on this.

[0163] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0164] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0165] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.

[0166] The above are only preferred embodiments of the present application and do not constitute any form of limitation to the present application. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A brake, characterized in that: include: A shell having an inner shell space; A fixing seat, located in the shell inner space and connected to the shell body; A brake piston is slidably connected to the fixing seat; A brake oil chamber for containing brake oil is formed between the fixing seat and the brake piston; the brake oil chamber has at least a first oil volume and a second oil volume, so that the brake generates different braking forces.

2. The brake according to claim 1, characterized in that The oil amount is negatively correlated with the braking force.

3. The brake according to claim 1, characterized in that The oil amount is positively correlated with the volume of the brake oil chamber.

4. The brake according to claim 1, characterized in that The brake also includes: a brake member configured to stop the rotation of the brake member by friction; An elastic member is used for biasing the brake piston to approach the brake member.

5. The brake according to claim 4, characterized in that The elastic member is configured as a spring.

6. The brake according to claim 5, characterized in that The different elastic members are arranged around the brake member on the same side of the brake piston.

7. The brake according to claim 6, characterized in that The brake also includes: A mounting seat, located in the shell inner space and coupled to the shell body; The brake piston has: a central axis; Wherein, the elastic member forms an axial movable connection with respect to the mounting seat along the central axis; The brake piston is slidably connected relative to the mounting seat in an axial direction along the central axis.

8. The brake according to claim 7, characterized in that The mounting seat and the brake piston form a receiving space for receiving the elastic member; Wherein, the brake oil chamber and the accommodating space are constructed as spaces that are not connected to each other.

9. The brake according to claim 8, characterized in that Around the central axis, the radial surface of the mounting seat has: The mounting portion is used to mount the elastic member.

10. The brake according to claim 9, characterized in that Around the central axis, the radial surface of the brake piston has: A connecting portion, used for mounting the elastic member; Wherein, along the axial direction of the central axis, a first projection of the mounting portion on the central axis and a second axial projection of the connecting portion on the central axis at least partially overlap.

11. The brake according to claim 10, characterized in that The connecting portion and / or the mounting portion is configured as a groove structure.

12. The brake according to claim 11, characterized in that Around the central axis, the mounting seat also has: An oil through hole, used to guide lubricating oil to the space inside the shell; Wherein, the oil through hole is formed on the radial surface of the mounting seat avoiding the mounting portion.

13. The brake according to claim 1, characterized in that Also includes: An oil pipeline is formed to the fixing seat; The oil passage is communicated with the brake oil chamber, and the brake oil is introduced into or discharged from the brake oil chamber along the oil passage.

14. The brake according to claim 11, characterized in that The brake also includes: a half shaft and a brake spline sleeve; Wherein, the half shaft and the brake component are respectively dynamically coupled with the brake spline sleeve.

15. The brake according to claim 14, characterized in that Around the central axis, the outer peripheral wall surface of the brake spline sleeve has: The first type of oil passage is used to guide lubricating oil to the space inside the shell; and / or Around the central axis, the radial surface of the brake spline sleeve has: The second type of oil passage is used to guide lubricating oil to the space inside the shell.

16. A drive axle assembly, characterized in that: Including a brake as described in any one of claims 1 to 15.

17. A vehicle, characterized in that: The invention comprises a drive axle assembly as claimed in claim 16.

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