Pedal simulator, hydraulic brake-by-wire system applying same and vehicle

Abstract

The pedal simulator comprises a shell, a damping piece and a piston assembly, the shell is provided with a cavity extending in the axis direction, a liquid inlet hole communicated with the cavity, and a blocking part extending in the radial direction is arranged on the inner side wall of the middle of the shell. A plurality of liquid passing grooves extending in the axis direction are formed in the outer side wall of the damping piece, the damping piece is arranged in a top cavity of the shell, the piston assembly is arranged in the cavity of the shell and can slide in a reciprocating mode along the axis, the piston assembly comprises a piston, an elastic connecting piece and a sliding extrusion piece, the piston and the sliding extrusion piece are sequentially arranged along the axis, and cavities are formed in the centers of the piston and the sliding extrusion piece. The sliding extrusion part is arranged on the blocking part and located under the damping part, the piston is arranged at the bottom of the shell, and the elastic connecting part is arranged in a cavity formed by the sliding extrusion part and the piston. The pedal simulator solves the problems that in the prior art, a pedal simulator is complex in structure, not easy to assemble, high in space occupancy rate and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of pedal simulators, and in particular relates to a pedal simulator and a hydraulic brake-by-wire system and a vehicle using the same. Background Art

[0002] The hydraulic brake-by-wire system belongs to the vehicle chassis system and is an important component of the vehicle's braking system. It can provide braking pressure to the vehicle's wheel cylinders, clamp the brake calipers, achieve vehicle braking, and adjust the wheel cylinder braking pressure in real time according to the vehicle body posture, so that the vehicle runs in a stable state and moves according to the driver's intention.

[0003] The pedal simulator is a key component of the hydraulic brake-by-wire system, providing the driver with a simulated pedal feel and varying feedback forces depending on how deeply the driver steps on the pedal.

[0004] At present, the main problems of pedal simulators are complex structure, difficulty in assembly, and high space occupancy. Utility Model Content

[0005] In view of the above-mentioned deficiencies in the prior art, the present invention provides a pedal simulator and a hydraulic brake-by-wire system and a vehicle using the same.

[0006] The purpose of this application is achieved through the following technical solutions:

[0007] In a first aspect, a pedal simulator is provided, comprising:

[0008] A shell having a cavity extending along an axial direction and a liquid inlet hole communicating with the cavity, wherein a stopper extending along a radial direction is provided on an inner wall of a middle portion of the shell;

[0009] A damping member having a plurality of liquid-passing grooves extending along the axial direction on the outer wall is arranged in the cavity at the upper portion of the shell;

[0010] A piston assembly disposed in the cavity of the housing and reciprocating along the axis comprises a piston, an elastic connector, and a sliding extrusion member, wherein the piston and the sliding extrusion member are sequentially arranged along the axis and each has a cavity extending in the axial direction at its center, the sliding extrusion member being disposed on the stop portion and directly below the damping member, the piston being disposed at the bottom of the housing, and the elastic connector being disposed in the cavity formed by the sliding extrusion member and the piston;

[0011] The shell axis direction is taken as the first direction.

[0012] In some embodiments, when brake fluid flows into the pedal simulator, the piston moves in a direction opposite to the first direction under the push of the brake fluid. At this time, the elastic connecting member is in a compressed state, and the sliding extrusion member is in a unchanged position state.

[0013] In some embodiments, when the piston moves in a direction opposite to the first direction until it contacts the sliding extrusion member, the entire piston assembly continues to move in a direction opposite to the first direction under the push of the brake fluid. At this time, the elastic connecting member is in a state of constant compression, and the sliding extrusion member and the damping member are in a contact or extrusion state.

[0014] In some embodiments, when the piston assembly moves in a direction opposite to the first direction until it contacts the blocking portion, the piston assembly stops moving. At this time, the elastic connecting member is in a constant compression state, and the sliding extrusion member and the damping member are in a constant extrusion state.

[0015] In some embodiments, the damping element is a block made of elastic material.

[0016] In some embodiments, the elastic modulus of the elastic connecting member is smaller than the elastic modulus of the damping member.

[0017] In some embodiments, a second sealing ring is provided between the piston and the inner side wall of the housing.

[0018] In some embodiments, the second sealing ring is a V-shaped leather cup.

[0019] In a second aspect, a hydraulic brake-by-wire system including the pedal simulator is provided.

[0020] According to a third aspect, a vehicle including the hydraulic brake-by-wire system is provided.

[0021] The beneficial effects of the utility model are as follows: the pedal simulator of the utility model has a compact internal structure and a smaller volume, is easy to assemble, provides different feedback forces, and can simulate a pedal feeling that is closer to that of an actual hydraulic brake-by-wire system in operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1It is a schematic structural diagram of a pedal simulator provided in one embodiment of the present invention;

[0024] Figure 2 This is a schematic structural diagram of a damping member provided in one embodiment of the present invention;

[0025] Figure 3 This is a structural diagram of a leather cup provided in one embodiment of the present invention;

[0026] Figure 4 This is a schematic structural diagram of a blocking portion provided in one embodiment of the present invention;

[0027] Figure 5 It is a structural schematic diagram of a piston provided in one embodiment of the present utility model. DETAILED DESCRIPTION

[0028] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0029] The utility model provides a pedal simulator that solves the problems of conventional pedal simulators, such as complex structural design, difficulty in assembly, and high space occupancy. The utility model also provides a hydraulic brake-by-wire system using the pedal simulator, and a vehicle using the hydraulic brake-by-wire system.

[0030] like Figure 1 As shown, in one embodiment, the pedal simulator 10 includes a housing 101 , a damping member 102 and a piston assembly 103 .

[0031] The housing 101 has a cavity extending along the axial direction and a liquid inlet P connected to the cavity. The inner wall of the middle portion of the housing 101 has a stopper 1015 extending in the radial direction. The axial direction of the housing 101 is taken as the first direction Y. In one embodiment, as shown in FIG. Figure 1 and Figure 4As shown, the housing 101 is formed by two hollow housing components connected together, wherein the two housing components are a lower housing 1011 and an upper housing 1012. The bottom of the lower housing 1011 has a liquid inlet P connected to the brake master cylinder. The middle inner wall of the lower housing 1011 has a radially extending groove. The stopper 1015 is arranged in the groove of the lower housing 1011. The stopper 1015 is a circular component with a through hole at the center and a plurality of bosses 1015a on the outer edge. 015a is interference fit with the bottom edge of the upper shell 1012 to reduce assembly force and prevent the upper shell 1012 from being deformed due to excessive extrusion; the lower section of the upper shell 1012 passes through the screw sleeve 1013 and is threadedly connected to the upper section of the lower shell 1011 through the screw sleeve 1013. Furthermore, a first sealing ring 1014 is provided in the gap formed by the screw sleeve 1013 and the lower shell 1011, thereby fixing the upper shell 1012 in the cavity of the lower shell 1011 and ensuring the sealing of the entire shell;

[0032] The outer wall of the damping member 102 has a plurality of liquid-passing grooves 1021 extending along the axial direction and arranged in the cavity at the upper portion of the housing 101; in one embodiment, as shown in FIG. Figure 1-2 As shown, the damping member 102 is disposed within a cavity at the top of the upper housing 1012 and forms an interference fit with the inner sidewall of the upper housing 1012. Multiple fluid flow grooves 1021 and spherical bumps 1022 are evenly distributed on the outer sidewall of the damping member 102. The fluid flow grooves 1021 allow brake fluid to flow freely on both sides of the damping member 102, preventing the brake fluid from affecting the deformation of the damping member 102. The spherical bumps 1022 both limit the radial movement of the damping member 102 within the upper housing 1012 and provide space for the damping member 102 to deform, preventing the damping member 102 from being unable to deform and causing the sliding extrusion member 1034 to be blocked from retreating. In one embodiment, the damping member 102 is a damping block made of rubber.

[0033] The piston assembly 103 is disposed in the cavity of the housing 101 and is reciprocatable along the axis. It includes a piston 1031, an elastic connector 1033, and a sliding extrusion member 1034. The piston 1031 and the sliding extrusion member 1034 are arranged in sequence along the axis and each has a cavity extending along the axis at its center. The sliding extrusion member 1034 is disposed on the stop 1015 and directly below the damping member 102. The piston 1031 is disposed at the bottom of the housing 101, and the elastic connector 1033 is disposed in the cavity formed by the piston 1031 and the sliding extrusion member 1034.

[0034] In one embodiment, if Figure 1 、 Figure 3 and Figure 5As shown, the piston 1031 is arranged in the cavity of the lower shell 1011 and has a gap with the inner wall of the lower shell 1011. In one embodiment, the gap between the piston 1031 and the inner wall of the lower shell 1011 is 0.05mm-0.1mm, which can not only ensure that the piston 1031 can move freely in the cavity of the lower shell 1011, but also avoid that the piston 1031 deflects during movement and squeezes and damages the inner wall of the lower shell 1011 due to excessive gap; a cavity extending along the first direction Y is provided at the top center of the piston 1031 and is located directly below the cavity of the sliding extrusion member 1034; an annular groove is provided on the side wall of the piston 1031, and a second sealing ring 1032 is assembled in the annular groove of the piston 1031. The brake fluid on both sides of the piston 1031 is isolated by the interference fit of the second sealing ring 1032, the piston 1031 and the inner wall of the lower shell 1011; in one embodiment, as Figure 3 As shown, the second sealing ring 1032 adopts a leather cup 1032a, the cross-sectional shape of the leather cup 1032a is V-shaped, and a plurality of annular sealing grooves are provided on the inner side of the leather cup 1032a for use with the annular groove of the piston 1031. The brake fluid pressure entering the liquid inlet hole P can act on the V-shaped structure of the leather cup 1032a, so that the leather cup 1032a is tightly attached to the inner wall of the lower shell 1011, thereby improving the sealing effect. The second sealing ring 1032 can also be replaced by a sealing structure made of other hydraulic oil-resistant and wear-resistant materials, such as an O-ring, a rectangular ring, an oil seal, etc. In one embodiment, as Figure 5 As shown, the piston 1031 has a truncated cone 1031a at the center of its bottom, and the truncated cone 1031a is disposed at the bottom of the lower housing 1011. A certain gap is formed between the piston 1031 and the bottom of the lower housing 1011, so that when the brake fluid enters the simulator through the liquid inlet hole P, it can fill the gap and thereby obtain a greater driving force. At the same time, when the brake fluid enters the simulator 10 through the liquid inlet hole P, it can be evenly applied to the leather cup 1032a, thereby avoiding leakage due to unilateral pressure on the leather cup 1032a.

[0035] In one embodiment, if Figure 1As shown, the sliding extrusion member 1034 includes a frustum section 1034a, a connecting section 1034b and an extending section 1034c. The cross-sectional area of the frustum section 1034a gradually decreases in the direction opposite to the first direction Y. The frustum section 1034a is arranged directly below the damping member 102 and can move to contact or squeeze the damping member 102. The contact or squeezing of the frustum section 1034a with the damping member 102 allows the entire piston assembly 103 to obtain a longer moving distance, better simulating the feedback force generated when the brake pedal is working. In one embodiment, the frustum section 1034a is arranged directly below the damping member 102 and can move to contact or squeeze the damping member 102. Segment 1034a may also adopt other cross-sectional shapes, such as a regular quadrangular pyramid; the connecting member 1034b is disposed on the stop portion 1015 and its top is connected to the bottom of the frustum segment 1034a. The connecting segment 1034b is clearance-fitted with the inner sidewall of the upper housing 1012. The extending segment 1034c is connected to the bottom of the connecting segment 1034b and is disposed in the cavity of the lower housing 1011 through the central through hole of the stop portion 1015. A through cavity extending along the first direction Y is formed at the center of the connecting segment 1034b and the extending segment 1034c.

[0036] The elastic connecting member 1033 is disposed in the cavity formed by the piston 1031 and the sliding extrusion member 1034. The elastic modulus of the elastic connecting member 1033 is smaller than the elastic modulus of the damping member 102. In one embodiment, the elastic connecting member 1033 is a spring.

[0037] When the brake fluid enters the pedal simulator 10 through the fluid inlet hole, the piston 1031 moves in the opposite direction of the first direction Y under the push of the brake fluid. At this time, the elastic connecting member 1033 is in a compressed state, and the sliding extrusion member 1034 is in a unchanged position state; in this process, the elastic connecting member 1033 provides a smaller feedback force to simulate the brake foot feel in the idle stroke stage of the brake wheel cylinder.

[0038] When the piston 1031 moves in the opposite direction of the first direction Y until it contacts the sliding extrusion member 1034, the entire piston assembly 103 continues to move in the opposite direction of the first direction Y under the push of the brake fluid. At this time, the elastic connecting member 1033 is in a constant compression state, and the sliding extrusion member 1034 and the damping member 102 are in a contact or extrusion state; during this process, the damping member 102 provides a large feedback force to simulate the feeling of the brake wheel cylinder brake pad after contacting the brake disc.

[0039] When the piston assembly 103 moves in the opposite direction of the first direction Y until it contacts the stopper 1015, the piston assembly 103 stops moving. At this time, the elastic connecting member 1033 is in a constant compression state, and the sliding extrusion member 1034 and the damping member 102 are in a constant extrusion state; in this process, as the sliding extrusion member 1034 is pressed into the damping member 102, more and more rubber material of the damping member 102 is displaced, and the feedback force obtained will also increase accordingly, which is closer to the actual feeling of increasing braking force during braking.

[0040] The pedal simulator 10 provided by the present invention uses two elastic structures with different elastic moduli, the elastic connecting member 1033 and the damping member 102. The movement of the piston assembly 103 compresses the elastic connecting member 1033 and the damping member 102 to obtain different feedback forces, which can simulate a pedal feeling that is closer to that of an actual hydraulic wire control brake system when it is working; at the same time, the entire structure also has the characteristics of simple design, easy assembly, and low space occupancy.

[0041] The above description is merely a preferred embodiment of one or more embodiments of this specification and is not intended to limit one or more embodiments of this specification. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of one or more embodiments of this specification shall be included in the scope of protection of one or more embodiments of this specification.

Claims

1. A pedal simulator, characterized in that include: A shell having a cavity extending along an axial direction and a liquid inlet hole communicating with the cavity, wherein a stopper extending along a radial direction is provided on an inner wall of a middle portion of the shell; A damping member having a plurality of liquid-passing grooves extending along the axial direction on the outer wall is arranged in the cavity at the upper portion of the shell; A piston assembly disposed in the cavity of the housing and reciprocating along the axis comprises a piston, an elastic connector, and a sliding extrusion member, wherein the piston and the sliding extrusion member are sequentially arranged along the axis and each has a cavity extending in the axial direction at its center, the sliding extrusion member being disposed on the stop portion and directly below the damping member, the piston being disposed at the bottom of the housing, and the elastic connector being disposed in the cavity formed by the sliding extrusion member and the piston; The shell axis direction is taken as the first direction.

2. The pedal simulator according to claim 1, wherein: When brake fluid flows into the pedal simulator, the piston moves in a direction opposite to the first direction under the pushing action of the brake fluid. At this time, the elastic connecting member is in a compressed state, and the sliding extrusion member is in a position-unchanged state.

3. The pedal simulator according to claim 1, wherein: When the piston moves in the direction opposite to the first direction until it contacts the sliding extrusion member, the entire piston assembly continues to move in the direction opposite to the first direction under the push of the brake fluid. At this time, the elastic connecting member is in a state of constant compression, and the sliding extrusion member and the damping member are in a contact or extrusion state.

4. The pedal simulator according to claim 1, wherein: When the piston assembly moves in a direction opposite to the first direction until it contacts the stopper, the piston assembly stops moving. At this time, the elastic connecting member is in a constant compression state, and the sliding extrusion member and the damping member are in a constant extrusion state.

5. The pedal simulator according to claim 1, wherein: The damping element is a block-shaped body made of elastic material.

6. The pedal simulator according to claim 1, wherein: The elastic modulus of the elastic connecting member is smaller than the elastic modulus of the damping member.

7. The pedal simulator according to claim 1, wherein: A second sealing ring is provided between the piston and the inner side wall of the housing.

8. The pedal simulator according to claim 7, characterized in that: The second sealing ring adopts a V-shaped leather cup.

9. Hydraulic brake-by-wire system, characterized in that: The pedal simulator comprises the pedal simulator according to any one of claims 1 to 8.

10. A vehicle, characterized in that Including the hydraulic brake-by-wire system according to claim 9.

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