Electric booster and vehicle

Abstract

The utility model provides an electric booster and a vehicle, and relates to the technical field of vehicle braking, the electric booster comprises a shell, a driving part arranged on the shell, a first driving component, a second driving component and a pushing component, the first driving component and the second driving component slide relative to the shell, and the pushing component is used for being connected with a piston rod; the return part is arranged between the first driving assembly and the shell and used for driving the first driving assembly to return, the first driving assembly is in transmission connection with the driving part and the pushing assembly, and the driving part synchronously slides with the pushing assembly during driving so that the return part can store energy; the second driving assembly penetrates through the first driving assembly, a first gap is formed between the second driving assembly and the pushing assembly, the brake pedal is treaded, the second driving assembly slides to eliminate the first gap, and then the pushing assembly is pushed to slide synchronously. According to the electric booster disclosed by the utility model, when a vehicle is automatically braked, the operation disorder of a driver caused by the automatic stroke change of the brake pedal can be prevented, so that the potential safety hazard in the driving process is favorably reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to vehicle brake technical field, especially relates to a kind of electric power booster.The utility model also relates to the vehicle of application above-mentioned electric power booster. BACKGROUND

[0002] In the braking system of current traditional fuel vehicle, vacuum booster with main cylinder liquid storage tank assembly is still the core device, which mainly provides amplification assistance for the mechanical action of driver's stepping brake pedal by utilizing the vacuum negative pressure generated by engine operation, so as to realize the function of deceleration and braking of vehicle. However, with the rapid development of new energy vehicle technology, pure electric and hybrid vehicle gradually become market mainstream, as the traditional internal combustion engine structure is cancelled in this type of vehicle, the brake assistance system relying on engine vacuum source cannot meet the technical requirements, therefore, electric brake system is gradually replacing traditional vacuum booster.

[0003] However, in the prior art, when the vehicle is automatically braked, the ejector rod assembly in the electric power booster moves forward under system control instruction, and will drive the ball head rod rigidly connected therewith to move synchronously, at this time, as the ball head rod and brake pedal arm are directly coupled by mechanical link, the displacement will be transmitted to the pedal arm through transmission mechanism, and then drive the brake pedal to produce active rotation around its rotating shaft.

[0004] Therefore, in automatic driving mode, when the vehicle actively implements braking strategy, the system will drive the ejector rod assembly to move by motor, at this time, even if the driver's foot does not exert any operating force, the brake pedal will still change stroke automatically due to mechanical transmission relationship. Such abrupt pedal action not only easily makes the driver misjudge the system state or produce operation interference, but also may cause operation confusion in emergency, thereby posing potential threat to driving safety. SUMMARY

[0005] Therefore, the utility model aims at providing an electric power booster to reduce the safety hazard in driving process.

[0006] To achieve the above purpose, the technical scheme of the utility model is as follows:

[0007] An electric power booster, comprising a housing, a driving part provided on the housing, a first driving assembly, a second driving assembly and an ejector assembly capable of sliding relative to the housing, and a return piece provided between the first driving assembly and the housing;

[0008] The first driving assembly is drivingly connected with the driving part and the ejector assembly respectively; the first driving assembly is driven by the driving part, can slide synchronously with the ejector assembly, and the return piece stores energy; the return piece releases energy to drive the first driving assembly to return.

[0009] The second driving assembly is arranged through the first driving assembly, and a first gap is arranged between the second driving assembly and the pushing assembly; the second driving assembly is used for connecting a brake pedal, and when the brake pedal is stepped on, the second driving assembly slides to eliminate the first gap, and then pushes the pushing assembly to slide synchronously.

[0010] The pushing assembly is used for connecting a piston rod of a master brake cylinder.

[0011] Further, the first driving assembly comprises a support frame slidingly arranged in the shell, and a tapered groove is arranged at one end of the support frame towards the pushing assembly, and the end of the tapered groove with a larger diameter is arranged towards the pushing assembly; the pushing assembly comprises a top rod seat in transmission connection with the piston rod, and the top rod seat comprises a seat plate embedded in the tapered groove, and the outer wall of the seat plate is arranged in the tapered groove.

[0012] Further, a second gap is arranged between the seat plate and the tapered groove along the radial direction of the tapered groove; and / or, a first round corner is arranged at one end edge of the seat plate towards the support frame, and a second round corner is arranged at one end edge of the seat plate away from the support frame.

[0013] Further, the piston rod is provided with a receiving cavity at one end towards the first driving assembly, and the pushing assembly further comprises a top rod in the receiving cavity; one end of the top rod is in ball joint connection with the top rod seat, and the other end of the top rod is placed on the bottom wall of the receiving cavity.

[0014] Further, the top rod seat further comprises a seat body arranged at one side of the seat plate, and the top rod seat is in ball joint connection with the top rod through the seat body; the seat body is inserted into the receiving cavity, and the receiving cavity is provided with a top rod bushing sleeved on the seat body.

[0015] Further, the top rod bushing is made of a material with elasticity.

[0016] Further, a guide hole is arranged in the shell, a wear-resistant ring is arranged on the support frame, and the support frame is slidingly arranged in the guide hole through the wear-resistant ring.

[0017] Further, the driving part comprises a motor, the first driving assembly further comprises a hollow screw in transmission connection with the motor, a guide support arranged on the support frame, and a sliding guide part arranged on the guide support.

[0018] The hollow screw is connected with the support frame through insertion, or the hollow screw is connected with the guide support through insertion; a guide structure is arranged between the sliding guide part and the shell, and the guide structure is used for guiding the sliding of the guide support relative to the shell;

[0019] The motor applies driving force to the hollow screw, the guide support is driven to slide relative to the shell, and the guide support drives the support frame to slide synchronously.

[0020] Further, the second driving assembly comprises a push rod fork connected with the brake pedal, a push rod arranged in the hollow screw and the support frame, and a ball head rod connected between the push rod fork and the push rod; one end of the ball head rod is detachably connected with the push rod fork, and the other end of the ball head rod is connected with the push rod through a ball joint; the first gap is arranged between the push rod and the push rod seat.

[0021] Compared with the prior art, the utility model has the following advantages:

[0022] The electric booster comprises the first driving assembly, the second driving assembly and the push assembly, two independent brake systems are formed, in the manual driving mode or when the driving part is damaged, the second driving assembly pushes the push assembly to brake, so that the normal use of the vehicle is guaranteed, in the automatic braking of the vehicle, the driving part drives the first driving assembly to push the push assembly to brake, and the return piece ensures that the brake pedal can be reliably reset after the brake is released, meanwhile, the first gap and the second driving assembly penetrating the first driving assembly are arranged, when the first driving assembly pushes the push assembly to brake, the second driving assembly is not interfered, so that the brake pedal cannot be changed in the automatic driving braking process, and the operation of the driver in the driving process is prevented from being confused, and the safety hidden danger in the driving process is reduced.

[0023] Secondly, by limiting the large-diameter end of the conical groove towards the push assembly, when the first driving assembly or the second driving assembly pushes the push assembly to slide, the radial component force generated by the conical surface when the conical groove slope surface contacts the end of the push assembly can automatically align the coaxiality of the two, effectively offsetting the risk of jamming caused by assembly error or shell deformation, ensuring the smoothness of the push assembly in high-frequency reciprocating motion, especially significantly improving the transmission reliability in the rapid braking response of the automatic driving mode. Meanwhile, the conical groove arranged on the support frame and the seat plate in the push rod seat adopt a conformal design, that is, the shape of the outer wall of the seat plate matches the shape of the conical groove, so that the seat plate can smoothly slide in the conical groove, and the friction force caused by the mismatch of the shapes can be reduced, thereby reducing the risk of jamming.

[0024] The presence of the second gap can reduce the direct contact area between the seat plate and the conical groove, thereby reducing the friction during relative movement, which helps to reduce the wear of the parts and prolong the service life. Moreover, the presence of the second gap also enables the seat plate to smoothly return to a state in which the axial direction is parallel to the axial direction of the conical groove after tilting, which can reduce the jamming phenomenon caused by excessive friction.

[0025] The presence of the first and second fillets enables smoother rotation of the seat plate in the conical groove, reduces the friction resistance caused by sharp edges, and reduces the direct contact area between the seat plate and the conical groove, thereby reducing the degree of wear and helping to prolong the service life of the seat plate and the conical groove. Moreover, the first and second fillets can cooperate with the inclined surface of the conical groove to automatically adjust the posture during movement, preventing the jamming phenomenon caused by edge scraping.

[0026] Furthermore, the ball joint connection of the ejector rod and the ejector rod seat enables flexible rotation of the ejector rod seat in three-dimensional space. When there is an assembly error between the conical groove and the ejector rod seat, the ball joint connection facilitates automatic adjustment of the angle of the ejector rod, avoiding the jamming or edge stress concentration that may be caused by rigid connection. At the same time, the design of the ejector rod being positioned on the bottom wall of the accommodating cavity enables the force to be directly transmitted to the bottom wall of the accommodating cavity through the ejector rod, forming a "point-to-surface" transmission path, which can avoid local overload and reduce the risk of piston rod fatigue.

[0027] The ball joint connection of the ejector rod seat and the ejector rod through the seat body can disperse the concentrated load transmitted by the ejector rod to the seat body through the spherical contact surface of the ball joint, and then uniformly act on the conical groove, significantly reducing the risk of local stress concentration. At the same time, the tight wrapping of the ejector rod bushing around the seat body forms radial constraint, which can prevent the seat body from radially shaking in the accommodating cavity due to lateral force or vibration, ensuring that the ball joint connection between the ejector rod and the seat body is always located near the axis of the ejector rod, which facilitates smoothness of the ejecting action.

[0028] The ejector rod bushing is made of elastic material, which can utilize the uniform contraction characteristics of the elastic bushing to automatically center the seat body in the accommodating cavity, reduce unilateral wear caused by eccentric load, and improve the smoothness of the transmission of the ejecting force. At the same time, when the ejector rod assembly is tilted, the elastic bushing can provide a certain automatic resetting force to the ejector rod, helping the seat body to automatically adjust to the correct position during resetting and compensating for the previous deviation or deformation.

[0029] The wear-resistant ring provided between the support frame and the guide hole can avoid direct contact between the support frame and the guide hole, thereby prolonging the service life of the support frame and the housing. At the same time, the wear-resistant ring can also provide uniform support force for the support frame, making the sliding of the support frame in the guide hole more stable, which helps to reduce the shaking and deviation of the support frame during sliding, improves the movement accuracy of the support frame, and ensures the stability and reliability of the entire structure.

[0030] And, the layout design of the driving part, the first driving assembly and other components is simple in structure, convenient for design implementation, and enables the electric power steering to be more compact in structure. The hollow screw rod and the support frame are connected in a plug-in manner, the hollow screw rod and the guide support are connected in a plug-in manner, the connecting manner is simple and direct, and the power of the motor can be effectively transmitted to the first driving assembly.

[0031] A guide structure is arranged between the sliding guide part and the shell, and the guide structure can accurately guide the sliding of the guide support relative to the shell, which helps to reduce the shaking and deviation of the guide support during sliding. The motor applies a driving force to the hollow screw rod, thereby driving the guide support to slide relative to the shell, and the guide support pushes the support frame to slide synchronously. This transmission mode can stably convert the rotary motion of the motor into the linear sliding of the support frame through the cooperative work of multiple components, provides reliable power output for the electric power steering, and ensures smooth operation of the power assisting process.

[0032] The second driving assembly is composed of a push rod fork, a push rod and a ball head rod, and is simple in structure and convenient for design implementation. The detachable connection design of the ball head rod and the push rod fork enables the entire second driving assembly to be removed without being disassembled during maintenance or replacement of related components, so that the maintenance difficulty and cost can be significantly reduced. In addition, the spherical hinge connection between the ball head rod and the push rod allows a certain angular freedom during transmission, which can effectively compensate for installation errors or deviations during movement, avoid jamming, and improve the smoothness and reliability of brake response.

[0033] The first gap is arranged between the push rod and the push rod seat, so that the double functions of electric power assisting and mechanical backup braking can be ensured. When the driving part works normally, the existence of the first gap can avoid mechanical transmission interference. When the motor fails or emergency braking is required, the driver can directly push the push rod assembly through the second driving assembly to realize pure mechanical braking and ensure driving safety.

[0034] Another purpose of the utility model is to provide a vehicle, wherein the vehicle is provided with the electric power steering described above.

[0035] The vehicle and the electric power steering described above have the same beneficial effects, and will not be described here. ACCOUT OF DRAWINGS

[0036] The drawings that form part of the utility model are used to provide a further understanding of the utility model, and the illustrative embodiments of the utility model and the description thereof are used to explain the utility model and do not constitute an improper limitation on the utility model. In the drawings:

[0037] Figure 1 The utility model discloses an electric power steering of the cross-sectional view of embodiment one is described;

[0038] Figure 2 For Figure 1 An enlarged view of the structure shown at A in the middle;

[0039] Figure 3 For Figure 1 An enlarged view of the structure shown at B in the middle.

[0040] BRIEF DESCRIPTION OF DRAWINGS

[0041] 1, the shell;

[0042] 2, the first drive assembly; 21, the support frame; 211, the conical groove; 212, the wear ring; 22, the hollow screw; 23, the guide support; 24, the sliding guide part;

[0043] 3, the second drive assembly; 31, the push rod fork; 311, the nut; 32, the ball head rod; 33, the push rod; 331, the needle locking nut;

[0044] 4, the push assembly; 41, the top rod seat; 411, the seat plate; 4111, the first round corner; 4112, the second round corner; 4113, the buffer; 412, the seat body; 413, the top rod bushing; 42, the top rod;

[0045] 5, the return piece;

[0046] 61, the first gap; 62, the second gap;

[0047] 7, the piston rod; 71, the containing cavity. DETAILED DESCRIPTION

[0048] It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict.

[0049] In the description of the utility model, it should be noted that the terms "upper", "lower", "inner", "back" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0050] Moreover, in the description of the utility model, unless otherwise expressly limited, the terms "mounting", "connecting", "connection", "connector" should be broadly understood. For example, it can be fixedly connected, or it can be detachably connected, or integrally connected; 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 communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood in combination with specific circumstances.

[0051] The utility model will be described in detail below with reference to the drawings and in combination with embodiments.

[0052] Embodiment one

[0053] The embodiment relates to an electric booster, which can solve the problem of driver operation confusion caused by the self-produced stroke change of a brake pedal during automatic braking of a vehicle, thereby reducing the safety hazards in driving.

[0054] Overall structure, in combination Figure 1 The electric booster of the embodiment comprises a housing 1, a driving part arranged on the housing 1, a first driving assembly 2, a second driving assembly 3 and a pushing assembly 4 capable of sliding relative to the housing 1, and a return piece 5 arranged between the first driving assembly 2 and the housing 1. The first driving assembly 2 is in transmission connection with the driving part and the pushing assembly 4 respectively, the first driving assembly 2 is driven by the driving part, can slide synchronously with the pushing assembly 4, and the return piece 5 stores energy. At the same time, the return piece 5 releases energy, and can drive the first driving assembly 2 to return.

[0055] In addition, the second driving assembly 3 is arranged through the first driving assembly 2, and a first gap 61 is arranged between the second driving assembly 3 and the pushing assembly 4, the second driving assembly 3 is used for connecting a brake pedal, and the brake pedal is stepped on, the second driving assembly 3 slides to eliminate the first gap 61, and then the pushing assembly 4 is synchronously slid by being pushed, and the pushing assembly 4 is used for connecting a piston rod 7 of a master cylinder.

[0056] At this time, through the arrangement of the first driving assembly 2, the second driving assembly 3 and the pushing assembly 4, two independent brake systems can be formed, that is, in the manual driving mode or when the driving part is damaged, the second driving assembly 3 can push the pushing assembly 4 to realize braking, so as to ensure the normal use of the vehicle, and secondly, when the vehicle is automatically braked, the driving part drives the first driving assembly 2 to push the pushing assembly 4 to realize braking, and the return piece 5 ensures that the brake pedal can be reliably reset after the brake is released.

[0057] Meanwhile, through the arrangement of the first gap 61 and the second driving assembly 3 penetrating the first driving assembly 2, when the first driving assembly 2 pushes the push assembly 4 to achieve braking, no interference is generated to the second driving assembly 3, so that no stroke change of the brake pedal is generated in the automatic driving braking process, and thus the operation of the driver in the driving process can be prevented from being confused, and the safety hidden danger in the driving process is reduced.

[0058] Specifically, in the manual driving mode, the driver steps on the brake pedal to make the second driving assembly 3 slide, and after the first gap 61 is eliminated, the push assembly 4 is pushed to slide synchronously, so that the push assembly 4 pushes the piston rod 7 to move forward, and thus the high-pressure brake fluid generated pushes the caliper to act, to achieve the braking effect. The connection relationship between the piston rod 7 and the master cylinder can be arranged according to the prior art, and will not be described here. It should be noted that the return of the brake pedal can drive the second driving assembly to return.

[0059] Secondly, in the automatic driving mode, when the vehicle is automatically braked, the first driving assembly 2 is driven to slide by the driving part, and the push assembly 4 is driven to slide synchronously, so that the push assembly 4 pushes the piston rod 7 to move forward, the high-pressure brake fluid generated pushes the caliper to act, to achieve the braking. Furthermore, when the driving part stops driving, the return member 5 automatically drives the first driving assembly 2 and the push assembly 4 to return to the initial position by releasing the stored energy, to achieve the reset, and thus the vehicle braking is released.

[0060] Moreover, through the arrangement of the second driving assembly 3 penetrating the first driving assembly 2, when the first driving assembly 2 slides, the second driving assembly 3 remains stationary, so that when the vehicle is automatically braked, the first driving assembly 2 does not interfere with the second driving assembly 3, that is, the brake pedal does not change automatically after the vehicle is automatically braked. It should be noted that the return member 5 in the embodiment can be an elastic member product known to those skilled in the art, such as a spring, rubber, etc.

[0061] Based on the above overall introduction, in the embodiment, as a preferred exemplary structure, it is shown in FIG. Figure 1 The first driving assembly 2 includes a support frame 21 slidingly arranged in the housing 1, and the support frame 21 is provided with a tapered groove 211 at one end thereof facing the push assembly 4, and the tapered groove 211 is provided with a larger-diameter end facing the push assembly 4.

[0062] Here, the large-diameter end of the conical groove 211 is directed towards the pushing assembly 4, and when the pushing assembly 4 is pushed by the first driving assembly 2 or the second driving assembly 3 to slide, the conical surface generates a radial force when the conical groove 211 is in contact with the end of the pushing assembly 4, which can automatically correct the coaxiality of the two, effectively offset the risk of jamming caused by assembly errors or deformation of the shell 1, and ensure the smoothness of the pushing assembly 4 in high-frequency reciprocating motion, especially significantly improve the transmission reliability in the rapid braking response of the automatic driving mode.

[0063] Meanwhile, the pushing assembly 4 includes a push rod seat 41 in driving connection with the piston rod 7, and the push rod seat 41 includes a seat plate 411 embedded in the conical groove 211, and the outer wall of the seat plate 411 is arranged in the conical groove 211. Thus, the conical groove 211 arranged on the support frame 21 and the seat plate 411 in the push rod seat 41 are designed to match the shape, that is, the shape of the outer wall of the seat plate 411 matches the shape of the conical groove 211. This design allows the seat plate 411 to smoothly slide in the conical groove 211, reducing the friction caused by the mismatch of the shapes, thereby reducing the risk of jamming.

[0064] In a specific structure, one end of the above-mentioned return member 5 is connected to the support frame 21, and the other end is connected to the shell 1. Considering the need for structural rigidity, the shell 1 in this embodiment is made of metal, which can be connected to the main brake cylinder of the vehicle by screwing. Meanwhile, in order to reduce the overall weight, the support frame 21 of this embodiment is made of plastic or other lightweight materials.

[0065] In a specific implementation, under the driving of the driving part, the support frame 21 slides to push the push rod seat 41 in the pushing assembly 4, so that the push rod seat 41 pushes the piston rod 7 to achieve the braking effect. Secondly, under the driving of the return member 5, the support frame 21 is reset, and at the same time, the high-pressure brake fluid passes through the pressure transmission channel at the rear end of the piston rod 7 to push the push rod seat 41 with a continuous and stable hydraulic pressure to complete the reset action synchronously.

[0066] Meanwhile, through the setting of the conical groove 211, the push rod seat 41 can be accurately returned under the driving of the hydraulic pressure, and will not be jammed. At this time, the channel between the liquid supplement hole on the piston rod 7 and the liquid storage tank will be completely unblocked, which can ensure that the brake fluid realizes rapid dynamic compensation in the reciprocating motion of the piston, thereby preventing the liquid supplement hole on the piston rod 7 from being blocked. It should be noted that the specific structure of the above-mentioned liquid supplement hole can be set according to the prior art, which will not be described here.

[0067] Furthermore, in order to further prevent the push rod seat 41 from being jammed, in this embodiment, the conical groove 211 is arranged on the support frame 21, and the seat plate 411 in the push rod seat 41 is arranged in the conical groove 211. Figure 2As shown in FIG. 11, a second gap 62 is provided between the seat plate 411 and the conical groove 211 along the radial direction of the conical groove 211. With this arrangement, the presence of the second gap 62 can reduce the direct contact area between the seat plate 411 and the conical groove 211, thereby reducing the friction during relative movement between the two, which helps to reduce the wear of the parts and prolong the service life. Moreover, the presence of the second gap 62 also allows the seat plate 411 to tilt and then return smoothly to a state in which the axial direction is parallel to the axial direction of the conical groove 211, which can reduce the jamming phenomenon caused by excessive friction.

[0068] Secondly, with continued reference to Figure 2 As shown in FIG. 11, the seat plate 411 is provided with a first rounded corner 4111 at one end edge facing the support frame 21, and a second rounded corner 4112 at one end edge facing away from the support frame 21. Here, the presence of the first rounded corner 4111 and the second rounded corner 4112 both makes the movement of the seat plate 411 in the conical groove 211 more smooth, which can reduce the friction resistance caused by sharp edges. At the same time, the first rounded corner 4111 and the second rounded corner 4112 can also reduce the direct contact area between the seat plate 411 and the conical groove 211, thereby reducing the degree of wear and helping to prolong the service life of the seat plate 411 and the conical groove 211.

[0069] Furthermore, the first rounded corner 4111 and the second rounded corner 4112 can both cooperate with the inclined surface of the conical groove 211, which is beneficial for the seat plate 411 to automatically adjust its posture during movement and prevent the jamming phenomenon caused by edge scraping.

[0070] In a specific structure, the radius of the first rounded corner 4111 and the second rounded corner 4112 is, for example, between 0.2 mm and 0.3 mm, such as 0.2 mm, 0.25 mm, 0.3 mm, etc. Of course, the specific value of the radius of the first rounded corner 4111 and the second rounded corner 4112 can also be designed and adjusted according to actual needs.

[0071] Further, in the present embodiment, as a preferred implementation form, as shown in Figure 1 As shown in FIG. 11, the piston rod 7 is provided with a receiving cavity 71 at one end facing the first driving assembly 2, and the push assembly 4 further includes a push rod 42 located in the receiving cavity 71. At the same time, one end of the push rod 42 is connected with the push rod seat 41 through a ball hinge, and the other end is placed on the bottom wall of the receiving cavity 71.

[0072] This arrangement has the advantage that connecting the push rod 42 and the push rod seat 41 through a ball hinge allows the push rod seat 41 to rotate flexibly in a three-dimensional space, and when there is an assembly error between the conical groove 211 and the push rod seat 41, the ball hinge connection facilitates the automatic adjustment of the angle of the push rod 42, avoiding the jamming or edge stress concentration that may be caused by rigid connection.

[0073] Meanwhile, the design that the ejector rod 42 is arranged on the bottom wall of the accommodating cavity 71 can make the force directly act on the bottom wall of the accommodating cavity 71 through the ejector rod 42, and form a “point-to-surface” force transmission path, which can avoid local overload and reduce the fatigue risk of the piston rod 7.

[0074] In the specific structure, the taper groove 211 in the embodiment has an opening angle of 50°, and the second gap 62 has a size of 0.1 mm. In this way, when the deflection angle of the ejector rod seat 41 is 3°, 5°, 6° or 9.5°, the ejector rod seat 41 will not be stuck.

[0075] In the specific implementation, the support frame 21 or the second driving assembly 3 pushes the ejector rod seat 41, and the ejector rod seat 41 pushes the ejector rod 42, so that the ejector rod 42 pushes the piston rod 7 to move forward to achieve the braking effect. In addition, under the driving of the return member 5, the ejector rod seat 41 will be reset.

[0076] It should be noted that the ejector rod seat 41 is connected to the ejector rod 42 through a spherical hinge, and the ejector rod seat 41 will be deflected. Therefore, through the arrangement of the taper groove 211 and the second gap 62, the ejector rod seat 41 can be prevented from being stuck when being reset, and through the arrangement of the first and second circular angles 4111 and 4112, the ejector rod seat 41 can be further prevented from being stuck by cooperating with the inclined surface of the taper groove 211.

[0077] In addition, in order to ensure the stability of the ejector rod seat 41, in the embodiment, the ejector rod seat 41 further includes a seat body 412 arranged on one side of the seat plate 411, and the ejector rod seat 41 is connected to the ejector rod 42 through the spherical hinge of the seat body 412. In this way, the ejector rod seat 41 is connected to the ejector rod 42 through the spherical hinge of the seat body 412, and the concentrated load transmitted by the ejector rod 42 can be dispersed to the seat body 412 through the spherical contact surface of the spherical hinge, and then uniformly act on the taper groove 211 through the seat plate 411, so that the risk of local stress concentration can be significantly reduced. Figure 1 Figure 3 In addition, in order to ensure the stability of the ejector rod seat 41, in the embodiment, the ejector rod seat 41 further includes a seat body 412 arranged on one side of the seat plate 411, and the ejector rod seat 41 is connected to the ejector rod 42 through the spherical hinge of the seat body 412. In this way, the ejector rod seat 41 is connected to the ejector rod 42 through the spherical hinge of the seat body 412, and the concentrated load transmitted by the ejector rod 42 can be dispersed to the seat body 412 through the spherical contact surface of the spherical hinge, and then uniformly act on the taper groove 211 through the seat plate 411, so that the risk of local stress concentration can be significantly reduced.

[0078] In the specific structure, the taper groove 211 in the embodiment has an opening angle of 50°, and the second gap 62 has a size of 0.1 mm. In this way, when the deflection angle of the ejector rod seat 41 is 3°, 5°, 6° or 9.5°, the ejector rod seat 41 will not be stuck. Figure 3

[0079] ​​In actual implementation, in the case that the support frame 21, the second driving assembly 3, or the top rod seat 41 is reset under the driving of the reset member 5, the top rod seat 41 will shake in the above case due to the connection between the seat body 412 of the top rod seat 41 and the top rod 42 through the ball hinge. At this time, the setting of the top rod bushing 413 helps the axis of the top rod 42 and the axis of the seat body 412 to keep coincident, improves the smoothness of power transmission, and can further prevent the seat plate 411 of the top rod seat 41 from being stuck.

[0080] Specifically, in order to realize the automatic reset of the seat body 412, the top rod bushing 413 in the embodiment is made of a material with elasticity. The advantage of this setting is that the uniform shrinkage characteristics of the elastic bushing can be used to automatically center the seat body 412 in the accommodating cavity 71, reduce unilateral wear caused by uneven load, and improve the smoothness of the pushing force transmission. At the same time, when the top rod seat 41 is tilted, a certain automatic reset force is given to the top rod seat 41 to help the seat body 412 to automatically adjust to the correct position during reset, and compensate for the previous deviation or deformation.

[0081] In the specific structure, the top rod bushing 413 in the embodiment can be made of rubber in the prior art. Of course, in addition to rubber, other common elastic materials such as elastic foam material and elastic plastic can also be used.

[0082] In addition, in order to ensure the stability of the sliding of the support frame 21, in the embodiment, as shown in Figure 1 , a guide hole is arranged in the shell 1, and the support frame 21 is sleeved with a wear-resistant ring 212, and the support frame 21 is arranged in the guide hole in a sliding manner through the wear-resistant ring 212. Through this setting, the wear-resistant ring 212 is arranged between the support frame 21 and the guide hole, which can avoid the direct contact between the support frame 21 and the guide hole to generate friction, thereby prolonging the service life of the support frame 21 and the shell 1.

[0083] At the same time, the wear-resistant ring 212 can also provide uniform support force for the support frame 21, so that the sliding of the support frame 21 in the guide hole is more stable. This helps to reduce the shaking and deviation of the support frame 21 during sliding, improves the motion accuracy of the support frame 21, and ensures the stability and reliability of the entire structure.

[0084] It should be noted that the structure of the guide hole cannot be shown according to the cutting direction of Figure 1 , and in the specific structure, a plurality of protrusions protruding inward are arranged on the inner wall of the shell 1, the plurality of protrusions are arranged at intervals around the axial direction of the shell 1, and the guide hole is formed by the surrounding of the plurality of protrusions arranged at intervals. The support frame 21 slides in the guide hole through the wear-resistant ring 212, and the number of protrusions can be two, three, four, etc. It should be noted that the protrusions and the guide structure described below are arranged alternately in the circumferential direction of the shell 1.

[0085] In particular implementation, the support frame 21 is provided with a connecting part, which is a groove formed on the outer circumferential surface of the support frame 21. The wear-resistant ring 212 is embedded in the groove. Under the driving of the driving part, the support frame 21 can slide in the guide hole of the housing 1 along the axial direction of the housing 1 through the wear-resistant ring, thereby facilitating to ensure the stability of the sliding of the support frame 21.

[0086] In addition, as a preferred implementation form, as shown in the figure, Figure 1 The driving part in the embodiment includes a motor. The first driving assembly 2 further includes a hollow screw 22 in transmission connection with the motor, a guide bracket 23 arranged on the support frame 21, and a sliding guide part 24 arranged on the guide bracket 23. Meanwhile, the hollow screw 22 is connected to the support frame 21 in a plug-in manner, and the hollow screw 22 is connected to the guide bracket 23 in a plug-in manner.

[0087] Here, the layout design of the driving part, the first driving assembly 2 and other components is simple in structure, easy to design and implement, and makes the structure of the electric power steering more compact. The hollow screw 22 and the support frame 21 are connected in a plug-in manner, and the guide bracket 23 and the hollow screw 22 are connected in a plug-in manner. This connection method is simple and direct, and can effectively transmit the power of the motor to the first driving assembly 2.

[0088] In addition, a guide structure is arranged between the sliding guide part 24 and the housing 1, which is used to guide the sliding of the guide bracket 23 relative to the housing 1. The motor applies a driving force to the hollow screw 22, which can drive the guide bracket 23 to slide relative to the housing 1, and the guide bracket 23 pushes the support frame 21 to slide synchronously.

[0089] Therefore, the guide structure is arranged between the sliding guide part 24 and the housing 1, which can accurately guide the sliding of the guide bracket 23 relative to the housing 1, which helps to reduce the shaking and deviation of the guide bracket 23 during sliding. The motor applies a driving force to the hollow screw 22, which in turn drives the guide bracket 23 to slide relative to the housing 1, and the guide bracket 23 pushes the support frame 21 to slide synchronously. This transmission method can stably convert the rotary motion of the motor into the linear sliding of the support frame 21 through the cooperation of multiple components, providing reliable power output for the electric power steering and ensuring smooth operation of the power assisting process.

[0090] It should be noted that the above-mentioned guide structure can also be set according to the prior art, for example, a guide block is arranged on the housing 1, the guide block extends along the axial direction of the housing 1, a sliding groove adapted to the guide block is arranged on the sliding guide part 24, and the sliding guide part 24 slides on the guide block through the sliding groove. In order to realize lightweight design, the sliding guide part 24 can be a sliding block made of engineering plastic.

[0091] In the specific structure, the hollow screw 22 is sleeved with a sleeve, the sleeve is in direct contact with the hollow screw 22 through a helical thread, the motor is in transmission connection with the sleeve through a secondary gear, at the same time, the hollow screw 22 is inserted in the support frame 21, and the guide support 23 is inserted in the hollow screw 22 after penetrating through the support frame 21, the guide support 23 is in interference fit with the hollow screw 22, at this time, the guide support 23, the sliding guide part 24, the hollow screw 22 and the support frame 21 can be regarded as a whole.

[0092] In the specific implementation, the motor drives the sleeve to rotate through the secondary gear, so that the hollow screw 22 can rotate, but the sliding guide part 24 arranged on the guide support 23 is connected to the housing 1, and the sliding guide part 24 can limit the rotation freedom of the guide support 23. Therefore, when the sleeve rotates, the rotation of the hollow screw 22 can be converted into a translational motion, and at this time, the guide support 23 will inevitably drive the support frame 21 to move in the axial direction of the housing 1 to push the rod seat 41, so as to push the rod 42 to push the piston rod 7 to realize braking.

[0093] Of course, as another preferred implementation form, the motor drives the screw to rotate, and the specific connection mode can be set according to the prior art, and at the same time, the nut is sleeved on the hollow screw 22, and the nut is connected and fixed to the housing 1, at this time, the guide support 23 is inserted in the support frame 21, and a gap is arranged between the guide support 23 and the hollow screw 22, when the motor drives the hollow screw 22 to rotate, the hollow screw 22 is directly attached to the nut through the thread, and since the nut is fixed to the housing 1, the hollow screw 22 can rotate and move along the axial direction of the housing 1 to push the support frame 21.

[0094] In addition, as a preferred implementation form in the embodiment, still referring to the second driving assembly 3 shown in Figure 1 The second driving assembly 3 includes a push rod fork 31 for transmission connection with a brake pedal, a push rod 33 penetrating through the hollow screw 22 and the support frame 21, and a ball head rod 32 connected between the push rod fork 31 and the push rod 33. One end of the ball head rod 32 is detachably connected with the push rod fork 31, the other end of the ball head rod 32 is ball-jointedly connected with the push rod 33, and a first gap 61 is arranged between the push rod 33 and the rod seat 41.

[0095] It can be understood that the second driving assembly 3 is composed of the push rod fork 31, the push rod 33 and the ball head rod 32, which is simple in structure and convenient for design and implementation. The detachable connection design of the ball head rod 32 and the push rod fork 31 makes it unnecessary to disassemble the entire second driving assembly 3 when maintaining or replacing related components, which can significantly reduce the difficulty and cost of maintenance. At the same time, the connection mode of the ball head rod 32 and the push rod 33 ball hinge connection allows a certain angular freedom in the transmission process, which can effectively compensate for installation errors or shifts in motion, avoid jamming phenomenon, and improve the smoothness and reliability of brake response.

[0096] At the same time, the first gap 61 is arranged between the push rod 33 and the push rod seat 41, which can ensure the dual functions of electric power-assisted braking and mechanical backup braking. When the driving part works normally, the existence of the first gap 61 can avoid mechanical transmission interference, and when the motor fails or emergency braking is needed, the driver can step on the brake pedal to directly push the push rod fork 31 through the second driving assembly 3 to realize pure mechanical braking and ensure driving safety.

[0097] In the specific structure, the ball head end of the ball head rod 32 is ball hinge connected with the push rod 33, and the end of the push rod fork 31 close to the ball head rod 32 is provided with a nut 311, and the other end of the ball head rod 32 can be screwed on the nut 311 of the push rod fork 31. Of course, in addition to the screwing mode, other common connection forms can also be adopted between the ball head rod 32 and the push rod fork 31. It should be noted that the connection mode between the push rod fork 31 and the brake pedal can be set according to the prior art, which will not be described here.

[0098] In the specific implementation, in the manual driving mode or when the driving part is damaged, the driver can push the push rod fork 31 by stepping on the brake pedal, push the ball head rod 32 through the push rod fork 31, and push the push rod 33 through the ball head rod 32, so that the push rod 33 pushes the push rod seat 41, and the push rod seat 41 pushes the push rod 42, so that the piston rod 7 advances, and the generated high-pressure brake fluid pushes the caliper to realize the braking effect.

[0099] It is worth mentioning that the end of the push rod 33 close to the push rod seat 41 is provided with a pin locking nut 331, and the seat plate 411 of the push rod seat 41 is provided with a buffer 4113. The push rod seat 41 and the pin locking nut 331 are both made of metal material, and the buffer 4113 can be made of plastic material. Therefore, when the pin locking nut 331 on the push rod 33 pushes the push rod seat 41, the collision between them will produce abnormal sound. At this time, under the action of the buffer 4113, the collision noise between the pin locking nut 331 and the push rod seat 41 can be reduced. It is worth mentioning that the pin locking nut 331 can be set according to the prior art, and its structure and principle will not be described here.

[0100] The electric power assistor of the embodiment is used in the artificial driving mode, when the driver steps on the brake pedal, the brake pedal pushes the push rod fork 31 forward, the push rod fork 31 pushes the ball head rod 32 forward, the ball head rod 32 pushes the push rod 33 forward, the push rod 33 pushes the needle assembly and the needle locking nut 331 forward. Since the needle assembly is inserted into the corresponding hole of the magnet assembly, the forward movement of the needle assembly will push the magnet assembly forward. At this time, since the pedal stroke sensor senses the forward movement of the magnet assembly, the pedal stroke sensor sends the signal generated by the movement of the magnet assembly to the vehicle ECU (Electronic Control Unit), and the vehicle ECU receives the signal and analyzes it and sends it to the ECU of the electronic integrated assistor assembly. The ECU of the electronic integrated assistor assembly commands the motor to rotate forward.

[0101] Secondly, the motor rotates forward to transmit torque to the motor drive pinion, which drives the primary gear assembly through gear engagement. Since the primary gear assembly is composed of a large gear and a pinion, the rotation of the large gear in the primary gear assembly drives the pinion in the primary gear assembly to rotate together. The pinion in the primary gear assembly drives the secondary driven gear assembly through gear engagement.

[0102] The secondary driven gear assembly has a screw sleeve structure integrated in its inner hole, and the secondary driven gear assembly can drive the screw sleeve to rotate under the drive of the pinion in the primary gear assembly. At the same time, the sliding guide 24 can limit the rotational freedom of the guide bracket 23, thereby limiting the rotation of the hollow screw rod 22. At this time, under the rotation of the screw sleeve, the hollow screw rod 22 can push the support frame 21 forward, which pushes the top rod seat 41 and the top rod 42, and makes the top rod 42 push the piston rod 7. The forward movement of the piston rod 7 can push the brake fluid, and the high-pressure brake fluid is output to the piston of the caliper, which pushes the friction plate to clamp the brake disc, thereby realizing the brake action.

[0103] Furthermore, when the driver releases the brake pedal, the ECU of the electronic integrated assistor assembly commands the motor to reverse, and due to the reverse rotation of the motor, the hollow screw rod 22 retreats, and under the cooperation of the return member 5, the support frame 21 retreats. At this time, the thrust force on the top rod seat 41 and the top rod 42 disappears, and the resistance of the top rod 42 to the piston rod 7 is removed, so the piston rod 7 retreats under the action of high-pressure oil, the master brake cylinder is depressurized, and the caliper piston is returned, thereby releasing the brake.

[0104] In the automatic driving mode of the vehicle, when the vehicle needs to automatically brake, the whole vehicle ECU directly gives the brake instruction to the ECU of the electric power booster, at this time, the motor rotates in the positive direction, and the rotation of the screw is driven by the secondary gear, and the torque is transmitted to the hollow screw 22 through the screw, and since the sliding guide part 24 is connected to the shell 1, the rotation of the guide bracket 23 is limited at this time, and when the rotation torque of the screw is transmitted to the hollow screw 22, the rotation of the hollow screw 22 is limited due to the axial rotation of the guide bracket 23, so at this time, the guide bracket 23 must advance or retreat along the axial direction under the rotation of the screw, and the axial translation motion is generated.

[0105] When the motor rotates in the positive direction, the hollow screw 22 advances, and the support frame 21 is pushed forward by the guide bracket 23, and the support frame 21 pushes the piston rod 7 forward through the top rod seat 41 and the top rod 42, and at this time, the piston rod 7 pushes the brake fluid to establish hydraulic pressure, and the high-pressure brake fluid pushes the piston of the brake caliper to advance through the brake pipeline, and the piston pushes the friction plate to clamp the brake disc to realize the braking action.

[0106] At this time, the support frame 21 advances and does not interfere with the push rod 33, and at this time, the push rod 33 remains in the static state, and thus, although the driver does not step on the brake pedal, the brake action has been completed, that is, when the automatic braking of the vehicle is completed, the brake pedal does not change, thereby preventing the brake pedal from changing the stroke and causing the driver to operate confusedly, thereby reducing the safety hidden danger in the driving process.

[0107] It should be noted that the electric power booster of the embodiment must be used in combination with the assembly of the master brake cylinder and the liquid tank to generate high-pressure brake fluid to push the caliper to act, and the assembly of the master brake cylinder and the liquid tank can be set according to the prior art, and the structure and principle will not be described in detail.

[0108] In addition, it is worth mentioning that when the motor, the ECU of the electric power booster, and the pedal stroke sensor fail or the intermediate connecting wire harness is disconnected in the automatic driving mode of the vehicle, the motor cannot drive the screw to rotate, at this time, the driver can step on the brake pedal, the pedal pushes the push rod 33 forward through the push rod fork 31 and the ball head rod 32, when the push rod 33 advances to eliminate the first gap 61, the push rod 33 pushes the top rod seat 41 and the top rod 42, and the piston rod 7 is pushed by the top rod 42 to establish high pressure in the master brake cylinder, and the brake effect is realized, thereby when the motor, the ECU of the electric power booster, and the pedal stroke sensor fail or the intermediate connecting wire harness is disconnected, the brake of the vehicle is not affected.

[0109] Embodiment two

[0110] The embodiment relates to a vehicle, which is provided with the electric booster in embodiment one between a brake pedal and a main brake cylinder.

[0111] The vehicle of the embodiment can form two independent brake systems through the electric booster in embodiment one, so that when the vehicle is automatically braked, the driver's operation confusion caused by the self-produced stroke change of the brake pedal can be prevented, and the safety hidden danger in the driving process is reduced.

[0112] The above is only a preferred embodiment of the utility model, and is not used to limit the utility model, and any modification, equivalent replacement, improvement and the like made within the spirit and principle of the utility model should be included in the protection range of the utility model.

Claims

1. An electric power booster, characterized in that: comprising a housing (1), a driving part arranged on the housing (1), a first driving assembly (2), a second driving assembly (3) and a pushing assembly (4) capable of sliding relative to the housing (1), and a return member (5) arranged between the first driving assembly (2) and the housing (1); the first driving assembly (2) is respectively in transmission connection with the driving part and the pushing assembly (4); the first driving assembly (2) is driven by the driving part, capable of synchronously sliding with the pushing assembly (4), and the return member (5) stores energy; the return member (5) releases energy, capable of driving the first driving assembly (2) to return; the second driving assembly (3) is arranged through the first driving assembly (2), and a first gap (61) is arranged between the second driving assembly (3) and the pushing assembly (4); the second driving assembly (3) is used for connecting a brake pedal, and when the brake pedal is stepped on, the second driving assembly (3) slides to eliminate the first gap (61), and then pushes the pushing assembly (4) to synchronously slide; the pushing assembly (4) is used for connecting a piston rod (7) of a master brake cylinder.

2. The electric power booster according to claim 1, characterized in that: the first driving assembly (2) comprises a support frame (21) slidingly arranged in the housing (1), one end of the support frame (21) towards the pushing assembly (4) is provided with a tapered groove (211), and the end of the tapered groove (211) with a larger diameter is arranged towards the pushing assembly (4); the pushing assembly (4) comprises a top rod seat (41) in transmission connection with the piston rod (7), the top rod seat (41) comprises a seat plate (411) embedded in the tapered groove (211), and the outer wall of the seat plate (411) is arranged in the tapered groove (211).

3. The electric power booster according to claim 2, characterized in that: a second gap (62) is arranged between the seat plate (411) and the tapered groove (211) along the radial direction of the tapered groove (211); and / or, a first round corner (4111) is arranged at the edge of one end of the seat plate (411) towards the support frame (21), and a second round corner (4112) is arranged at the edge of one end of the seat plate (411) away from the support frame (21).

4. The electric power booster according to claim 2, characterized in that: one end of the piston rod (7) towards the first driving assembly (2) is provided with a containing cavity (71), and the pushing assembly (4) further comprises a top rod (42) located in the containing cavity (71); one end of the top rod (42) is in ball joint connection with the top rod seat (41), and the other end of the top rod (42) is placed on the bottom wall of the containing cavity (71).

5. The electric power booster according to claim 4, characterized in that: the top rod seat (41) further comprises a seat body (412) arranged at one side of the seat plate (411), and the top rod seat (41) is in ball joint connection with the top rod (42) through the seat body (412). ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The seat body (412) is inserted into the accommodating cavity (71), and a ejector pin bushing (413) is arranged in the accommodating cavity (71) and sleeved on the seat body (412).

6. The electric power assistor according to claim 5, characterized in that: The ejector pin bushing (413) is made of elastic material.

7. The electric power assistor according to claim 2, characterized in that: The shell (1) is provided with a guide hole, the support frame (21) is provided with a wear-resistant ring (212), and the support frame (21) is slidably arranged in the guide hole through the wear-resistant ring (212).

8. The electric power assistor according to any one of claims 2-7, characterized in that: The driving part comprises a motor, the first driving assembly (2) further comprises a hollow screw rod (22) in transmission connection with the motor, a guide support (23) arranged on the support frame (21), and a sliding guide part (24) arranged on the guide support (23); The hollow screw rod (22) is connected to the support frame (21) in a plug-in manner, or the hollow screw rod (22) is connected to the guide support (23) in a plug-in manner; a guide structure is arranged between the sliding guide part (24) and the shell (1), and the guide structure is used for guiding the guide support (23) to slide relative to the shell (1); The motor applies a driving force to the hollow screw rod (22), which can drive the guide support (23) to slide relative to the shell (1), and the guide support (23) pushes the support frame (21) to slide synchronously.

9. The electric power assistor according to claim 8, characterized in that: The second driving assembly (3) comprises a push rod fork (31) in transmission connection with the brake pedal, a push rod (33) passing through the hollow screw rod (22) and the support frame (21), and a ball head rod (32) connected between the push rod fork (31) and the push rod (33); One end of the ball head rod (32) is detachably connected to the push rod fork (31), and the other end of the ball head rod (32) is ball-jointedly connected to the push rod (33); The first gap (61) is arranged between the push rod (33) and the ejector pin seat (41).

10. A vehicle, characterized in that: The electric power assistor according to any one of claims 1-9 is arranged between the brake pedal and the master brake cylinder of the vehicle.

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