Main cylinder piston return vibration isolation structure and brake-by-wire system
By introducing vibration isolation rings and return springs into the master cylinder piston return structure, the noise and vibration problems during piston return are solved, resulting in better NVH performance and driving experience.
Patent Information
- Application Number
- CN202520120001.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-17
- Publication Date
- 2025-12-09
- Estimated Expiration
- 2035-01-17
AI Technical Summary
The existing master cylinder piston return structure generates significant noise and vibration upon impact, affecting the overall vehicle NVH performance and the subjective experience of passengers.
The structure employs a vibration isolation ring, which includes the installation of the vibration isolation ring within the stepped holes of the bracket. The vibration isolation ring has honeycomb holes and slots. The deformation of the vibration isolation ring and the honeycomb holes reduce vibration and noise. Combined with the return spring and elastic adapter, the movement of the piston rod is optimized, reducing vibration and noise during impact.
It effectively reduces impact noise and vibration during the return of the master cylinder piston, improves the overall NVH performance of the vehicle, and enhances the subjective experience of the driver and passengers.
Smart Images
Figure CN223648388U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of braking device technology, and in particular to a master cylinder piston return vibration isolation structure and a brake-by-wire system. Background Technology
[0002] The existing master cylinder piston return structure mainly includes a master cylinder piston, a metal bracket, and a metal locating ring. The metal locating ring and the master cylinder piston are connected together by an interference fit to form a single unit, and the upper surface of the metal locating ring is in direct planar contact with the inner bottom surface of the metal bracket. When the brake pedal is depressed, the master cylinder piston, under the influence of the brake pedal structure and pedal force, moves the metal locating ring away from the inner surface of the metal bracket. When the brake pedal is released, the master cylinder piston moves the locating ring back to its original position quickly, and the upper surface of the locating ring directly impacts the inner bottom surface of the bracket (both are metal parts). Because both the locating ring and the bracket are metal parts, the impact noise and vibration are significant, affecting the overall NVH performance of the vehicle and the subjective experience of the passengers. Utility Model Content
[0003] This invention addresses the technical problem of impact noise generated during the return of the master cylinder piston, which affects the NVH performance of the entire vehicle. It provides a vibration isolation structure for the return of the master cylinder piston and a brake-by-wire system.
[0004] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:
[0005] On one hand, this utility model provides a master cylinder piston return vibration isolation structure, including a bracket, a first piston rod extending into the bracket at its upper end, and a positioning ring press-fitted onto the upper end of the first piston rod. The bracket has a vertically penetrating stepped hole for the insertion of the first piston rod. The wall of the stepped hole has an annular groove, which is connected to the shoulder of the stepped hole. A vibration isolation ring is installed in the annular groove. The upper side of the vibration isolation ring abuts against the shoulder of the stepped hole, and the lower side abuts against the positioning ring. The vibration isolation ring has multiple honeycomb holes.
[0006] The beneficial effects of this utility model are: when braking is stopped, the first piston rod and the positioning ring move simultaneously relative to the bracket toward the shoulder of the stepped hole, the upper side of the positioning ring and the lower side of the vibration isolation ring directly collide, and the vibration isolation ring deforms under the force to reduce the vibration generated during the impact. At the same time, the honeycomb holes on the vibration isolation ring reduce vibration noise, improve the existing technical problem that the first piston rod will generate impact noise when returning to its original position, which affects the NVH performance of the whole vehicle, and give the driver and passengers a better subjective experience.
[0007] Based on the above technical solution, the present invention can be further improved as follows.
[0008] Furthermore, the vibration isolation ring is provided with an opening to form an open ring structure.
[0009] The beneficial effect of adopting the above-mentioned further solution is that when installing the vibration isolation ring in the annular groove, one end of the vibration isolation ring can be inserted into the annular groove first, so that the vibration isolation ring can be installed in the annular groove more smoothly relative to the entire annular ring structure.
[0010] Furthermore, the vibration isolation ring has a slot at one end of the opening and a block adapted to and slidably connected to the slot at the other end, and the wall of the slot extends through the inner and / or outer side of the vibration isolation ring.
[0011] The beneficial effect of adopting the above-mentioned further scheme is that when one end of the vibration isolation ring is first inserted into the ring groove, and the other end is inserted into the ring groove, it can slide and be locked into the slot in the ring groove, so that the two ends of the vibration isolation ring are connected to each other and form a closed ring structure, so that the vibration isolation ring can form a vibration reduction effect on the entire upper plane of the positioning ring and ensure the force balance of the positioning ring.
[0012] Furthermore, the card block has an inclined surface near the inner and / or outer side of the vibration isolation ring.
[0013] The beneficial effect of adopting the above-mentioned further solution is that when the card block is slid and inserted into the card slot, the corresponding inclined surface forms a guiding effect, ensuring that the card block slides smoothly and is inserted into the card slot.
[0014] Furthermore, the vibration isolation ring has multiple through holes extending along its radial direction, and each of the through holes is circumferentially distributed among the multiple through holes.
[0015] The beneficial effect of adopting the above-mentioned further solution is that when the vibration isolation ring is impacted by the positioning ring, the parts with through holes can undergo adaptive deformation at the same time to reduce the vibration generated during the impact.
[0016] Furthermore, a slot is provided on the outer side of the positioning ring. The slot is a ring structure, and the upper side of the positioning ring corresponding to the slot abuts against the vibration isolation ring.
[0017] The beneficial effect of adopting the above-mentioned further scheme is that when the positioning ring impacts the vibration isolation ring upwards, the straight arm portion formed by the positioning ring impacts the vibration isolation ring. While the vibration is reduced by the vibration isolation ring, the straight arm portion of the positioning ring is subjected to a reaction force, thereby improving its vibration reduction effect relative to the solid structure.
[0018] Furthermore, it also includes an oil passage block fixedly connected to the bracket at its upper end, a second piston rod sliding within the oil passage block at its upper end, a return spring installed within the oil passage block, and a push rod inserted into the upper part of the stepped hole and pressed onto the first piston rod at its lower end. The lower end of the first piston rod is slidably connected within the oil passage block, and the upper end of the return spring abuts against the first piston rod, while the lower end abuts against the second piston rod.
[0019] The beneficial effects of adopting the above-mentioned further solution are as follows: The upper end of the push rod is connected to the brake pedal of the vehicle. Pressing the brake pedal can drive the push rod to move, and the push rod drives the first piston rod and the positioning ring to move simultaneously. At this time, the return spring is compressed. When the foot releases the brake pedal, under the action of the brake pedal structure, the rapid disappearance of the pedal force, and the action of the brake fluid pressure and the return force of the return spring inside the braking system, the brake pedal structure drives the push rod to return quickly. The upper side of the positioning ring and the lower bottom surface of the vibration isolation ring directly impact each other. When impacted, a certain elastic deformation will be generated, which will reduce the vibration and impact noise generated during the impact, reduce the impact on the NVH of the whole vehicle, and give the driver and passengers a better subjective experience.
[0020] Furthermore, at least one rubber cup is press-fitted into the inner wall of the oil passage block, and each rubber cup is pressed against the outer wall of the first piston rod.
[0021] The beneficial effect of adopting the above-mentioned further solution is that during the sliding process of the first piston rod relative to the oil passage block, each rubber cup is always in contact with the outer wall of the first piston rod to form a sealing and protective effect.
[0022] Furthermore, the upper end of the first piston rod is provided with a slot; it also includes an elastic adapter installed in the slot of the first piston rod, the elastic adapter including a retaining cylinder whose lower end is pressed against the lower end of the push rod, a retaining spring whose lower end abuts against the retaining cylinder, and a press-fit elastic member whose lower side abuts against the retaining spring, the press-fit elastic member being engaged in the first piston rod.
[0023] The beneficial effect of adopting the above-mentioned further solution is that when braking and force is transmitted to the push rod, the elastic adapter presses the push rod in a way that is flippable / tiltable but axially immovable, so that the push rod tilts at a corresponding angle when under force. When no braking force is received, the push rod returns to the center position under the action of the elastic adapter.
[0024] On the other hand, this utility model provides a brake-by-wire system, including the aforementioned master cylinder piston return vibration isolation structure. Attached Figure Description
[0025] Figure 1 This is a structural diagram of the main cylinder piston return vibration isolation structure of this utility model;
[0026] Figure 2 For the present utility model Figure 1 Enlarged view of section A;
[0027] Figure 3 This is the first structural diagram of the vibration isolation ring of this utility model;
[0028] Figure 4 This is a second structural diagram of the vibration isolation ring of this utility model, shown from a first-person perspective.
[0029] Figure 5 This is a second structural diagram of the vibration isolation ring of this utility model, shown from a second perspective.
[0030] Figure 6 This is a structural diagram of the relevant technology.
[0031] The attached diagram lists the components represented by each number as follows:
[0032] 1. Bracket; 11. Stepped hole; 12. Annular groove;
[0033] 2. First piston rod;
[0034] 3. Positioning ring; 31. Groove;
[0035] 4. Vibration isolation ring; 41. Honeycomb hole; 42. Opening; 43. Slot; 44. Block; 441. Bevel; 45. Through hole;
[0036] 5. Oil circuit block; 51. Leather cup;
[0037] 6. Second piston rod;
[0038] 7. Return spring;
[0039] 8. Putting cue; 81. Ball head;
[0040] 9. Elastic adapter; 91. Retaining cylinder; 92. Retaining spring; 93. Press-fit elastic element. Detailed Implementation
[0041] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.
[0042] like Figure 6In existing technology, the master cylinder piston return structure mainly includes a first piston rod 2, a metal bracket 1, and a metal positioning ring 3. The positioning ring 3 and the first piston rod 2 are connected together by an interference fit to form a single unit, and the upper surface of the positioning ring 3 is in direct planar contact with the inner bottom surface of the bracket 1. When the positioning ring 3 returns to its original position quickly, the upper surface of the positioning ring 3 and the inner bottom surface of the bracket 1 (both are metal parts) directly impact each other, generating significant impact noise and vibration, affecting the overall NVH performance of the vehicle and the subjective experience of the passengers. To address this issue, this invention provides a master cylinder piston return vibration isolation structure and a brake-by-wire system to improve this problem.
[0043] On the one hand, this utility model provides a master cylinder piston return vibration isolation structure, as described below.
[0044] Example 1
[0045] like Figures 1 to 3 A master cylinder piston return vibration isolation structure includes a bracket 1, a first piston rod 2 extending into the bracket 1 at its upper end, and a positioning ring 3 press-fitted onto the upper end of the first piston rod 2. The bracket 1 has a vertically penetrating stepped hole 11 for the insertion of the first piston rod 2. The wall of the stepped hole 11 has an annular groove 12 connected to the shoulder of the stepped hole 11. A vibration isolation ring 4 is installed in the annular groove 12. The upper side of the vibration isolation ring 4 abuts against the shoulder of the stepped hole 11, and the lower side abuts against the positioning ring 3. The vibration isolation ring 4 has multiple honeycomb holes 41.
[0046] The beneficial effects of this embodiment are as follows: when braking ends, the first piston rod 2 and the positioning ring 3 move simultaneously relative to the bracket 1 toward the shoulder of the stepped hole 11, the upper side of the positioning ring 3 and the lower side of the vibration isolation ring 4 directly collide, and the vibration isolation ring 4 deforms under the force to reduce the vibration generated during the impact. At the same time, the honeycomb holes 41 on the vibration isolation ring 4 reduce vibration noise, improve the existing technical problem that the first piston rod 2 will generate impact noise when returning to its original position, affecting the NVH performance of the whole vehicle, and give the driver and passengers a better subjective experience.
[0047] Among them, the vibration isolation ring 4 is not made of rubber or plastic, but can be made of materials such as rubber and silicone.
[0048] Example 2
[0049] like Figure 2 and Figure 3 Based on Example 1, the vibration isolation ring 4 is provided with an opening 42 to form an open ring structure.
[0050] The advantage of adopting the preferred solution in the above embodiments is that when installing the vibration isolation ring 4 in the annular groove 12, one end of the vibration isolation ring 4 can be inserted into the annular groove 12 first, so that the vibration isolation ring 4 can be installed more smoothly in the annular groove 12 relative to the entire annular ring structure.
[0051] In this embodiment of the present invention, under natural conditions, the outer diameter of the annular structure formed by the vibration isolation ring 4 is larger than the groove diameter of the annular groove 12, so that after the vibration isolation ring 4 is installed, an interference fit is formed between it and the annular groove 12, ensuring the stable installation of the vibration isolation ring 4.
[0052] Example 3
[0053] like Figure 4 and Figure 5 Based on embodiments 1 and 2, a slot 43 is provided on one end of the vibration isolation ring 4 at the opening 42, and a block 44 is provided on the other end to be adapted to and slidably connected to the slot 43, and the groove wall of the slot 43 extends through the inner and / or outer sides of the vibration isolation ring 4.
[0054] The beneficial effect of adopting the preferred solution in the above embodiments is that when one end of the vibration isolation ring 4 is first inserted into the annular groove 12 and the other end is inserted into the annular groove 12, it can slide and be locked into the slot 43 in the annular groove 12, so that the two ends of the vibration isolation ring 4 are connected to each other and form a closed ring structure, so that the vibration isolation ring 4 can form a vibration reduction effect on the entire upper plane of the positioning ring 3, ensuring the force balance of the positioning ring 3.
[0055] Based on the above embodiment, the slot 43 is a stepped slot or a dovetail slot to prevent the card block 44 from falling out of the slot 43.
[0056] In this embodiment of the present invention, when the two ends of the vibration isolation ring 4 are in abutting state, the outer diameter of the annular structure formed by it is not less than the groove diameter of the annular groove 12, so that after the vibration isolation ring 4 is installed, an interference fit is formed between it and the annular groove 12, ensuring the stable installation of the vibration isolation ring 4.
[0057] Example 4
[0058] like Figure 4 and Figure 5 Based on embodiments 1-3, the card block 44 is provided with an inclined surface 441 near the inner and / or outer side of the vibration isolation ring 4.
[0059] The beneficial effect of adopting the preferred solution in the above embodiments is that when the card block 44 is slid and inserted into the card slot 43, the corresponding inclined surface 441 forms a guiding effect, ensuring that the card block 44 slides smoothly and is inserted into the card slot 43.
[0060] Example 5
[0061] like Figures 1 to 5 Based on embodiments 1-4, the vibration isolation ring 4 has multiple through holes 45 extending through it in the radial direction, and each through hole 45 is evenly distributed in the circumferential direction of the multiple through holes 45.
[0062] The beneficial effect of adopting the preferred solution in the above embodiments is that when the vibration isolation ring 4 is impacted by the positioning ring 3, the parts with through holes 45 can undergo adaptive deformation at the same time to reduce the vibration generated during the impact.
[0063] Example 6
[0064] like Figure 1 and Figure 2 Based on embodiments 1-5, a slot 31 is provided on the outer side of the positioning ring 3. The slot 31 is a ring structure, and the upper side of the positioning ring 3 corresponding to the slot 31 abuts against the vibration isolation ring 4.
[0065] The beneficial effect of the preferred solution in the above embodiments is that when the positioning ring 3 impacts the vibration isolation ring 4 upwards, the straight arm portion formed by the positioning ring 3 impacts the vibration isolation ring 4. While the vibration is reduced by the vibration isolation ring 4, the straight arm portion of the positioning ring 3 is subjected to a reaction force, thereby improving its vibration reduction effect relative to the solid structure.
[0066] Example 7
[0067] like Figure 1 and Figure 2 Based on embodiments 1-6, the main cylinder piston return vibration isolation structure of this utility model further includes an oil passage block 5 fixedly connected to the bracket 1 at its upper end, a second piston rod 6 sliding within the oil passage block 5 at its upper end, a return spring 7 installed within the oil passage block 5, and a push rod 8 inserted into the upper part of the stepped hole 11 at its lower end and pressed onto the first piston rod 2. The lower end of the first piston rod 2 is slidably connected within the oil passage block 5, the upper end of the return spring 7 abuts against the first piston rod 2, and the lower end abuts against the second piston rod 6.
[0068] The beneficial effect of adopting the preferred solution in the above embodiments is that the upper end of the push rod 8 is connected to the brake pedal of the vehicle. Pressing the brake pedal can drive the push rod 8 to move, and the push rod 8 drives the first piston rod 2 and the positioning ring 3 to move simultaneously. At this time, the return spring 7 is compressed. When the foot releases the brake pedal, under the action of the brake pedal structure, the rapid disappearance of the pedal force, and the action of the brake fluid pressure and the return force of the return spring 7 inside the braking system, the brake pedal structure drives the push rod 8 to return quickly. The upper side of the positioning ring 3 and the lower bottom surface of the vibration isolation ring 4 directly impact each other. When impacted, a certain elastic deformation will be generated, which reduces the vibration generated during the impact and reduces the impact noise, reduces the impact on the NVH of the whole vehicle, and gives the driver and passengers a better subjective experience.
[0069] Example 8
[0070] like Figure 1 and Figure 2 Based on embodiments 1-7, at least one rubber cup 51 is press-fitted into the inner wall of the oil passage block 5, and each rubber cup 51 is pressed against the outer wall of the first piston rod 2.
[0071] The beneficial effect of adopting the preferred solution in the above embodiments is that, during the process of the first piston rod 2 sliding relative to the oil passage block 5, each diaphragm 51 always abuts against the outer wall of the first piston rod 2 to form a sealing and protective effect.
[0072] The leather cup 51 can be made of rubber material.
[0073] Example 9
[0074] like Figure 1 and Figure 2 Based on embodiments 1-8, a slot is provided at the upper end of the first piston rod 2; the main cylinder piston return vibration isolation structure of this utility model also includes an elastic adapter 9 installed in the slot of the first piston rod 2. The elastic adapter 9 includes a retaining cylinder 91 with its lower end pressed against the lower end of the push rod 8, a retaining spring 92 with its lower end abutting against the retaining cylinder 91, and a press-fit elastic member 93 with its lower side abutting against the retaining spring 92. The press-fit elastic member 93 is snapped into the first piston rod 2.
[0075] The beneficial effect of the preferred solution in the above embodiments is that when braking and force is transmitted to the push rod 8, the elastic adapter 9 presses the push rod 8 in a flip-up / tilt-out manner but not axially displaceable, so that the push rod 8 tilts at a corresponding angle when under force, and when not under braking force, the push rod 8 returns to the center position under the action of the elastic adapter 9.
[0076] Both the retaining cylinder 91 and the press-fit elastic element 93 can be made of rubber material.
[0077] A ball head 81 is fixedly connected to the lower end of the push rod 8, and an arc-shaped groove is formed at the bottom of the hole in the first piston rod 2. The spherical surface of the ball head 81 fits and abuts against the arc-shaped groove. The diameter of the ball head 81 is larger than the rod diameter of the push rod 8, so as to form a stepped structure relative to the push rod 8.
[0078] The retaining sleeve 91 is fitted onto the push rod 8, and its inner diameter is larger than the outer diameter of the push rod 8. The retaining sleeve 91 has a stepped shaft structure, and its lower end abuts against the ball head 81. The retaining spring 92 is fitted onto the push rod 8 and is located inside the upper end of the retaining sleeve 91. Its lower end abuts against the shoulder of the retaining sleeve 91, and its upper end extends out of the retaining sleeve 91.
[0079] An annular groove is provided on the inner wall of the slot of the first piston rod 2. The press-fit elastic member 93 is sleeved on the push rod 8, and its inner diameter is larger than the outer diameter of the push rod 8. The press-fit elastic member 93 is locked in the annular groove, and its lower side abuts against the upper end of the retaining spring 92.
[0080] When the push rod 8 tilts under force, the ball head 81 rotates adaptively relative to the first piston rod 2 at the arc groove, shifting by a certain angle. At this time, the retaining spring 92 deforms adaptively. When the braking force is removed, under the return action of the retaining spring 92, the force is transmitted through the retaining cylinder 91, causing the push rod 8 to return to the center and remain coaxial with respect to the first piston rod 2.
[0081] On the other hand, this utility model provides a brake-by-wire system, as described below.
[0082] Example 10
[0083] A brake-by-wire system includes a master cylinder piston return vibration isolation structure as described in Examples 1-9, and also includes a fluid storage device and a wheel cylinder. The master cylinder piston return vibration isolation structure is a brake piston cylinder. The fluid storage device stores fluid. The wheel cylinder and the master cylinder are connected through a hydraulic circuit, and the master cylinder provides braking fluid to the wheel cylinder.
[0084] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0085] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0086] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0087] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0088] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0089] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.
Claims
1. A master cylinder piston return vibration isolation structure, comprising a bracket (1), a first piston rod (2) extending into the bracket (1) at its upper end, and a positioning ring (3) press-fitted onto the upper end of the first piston rod (2), wherein the bracket (1) has a vertically penetrating stepped hole (11) for inserting the first piston rod (2), characterized in that, The stepped hole (11) has an annular groove (12) on its wall. The annular groove (12) is connected to the shoulder of the stepped hole (11). A vibration isolation ring (4) is installed in the annular groove (12). The upper side of the vibration isolation ring (4) abuts against the shoulder of the stepped hole (11), and the lower side abuts against the positioning ring (3). The vibration isolation ring (4) has multiple honeycomb holes (41).
2. The master cylinder piston return vibration isolation structure according to claim 1, characterized in that, The vibration isolation ring (4) is provided with an opening (42) to form an open ring structure.
3. The master cylinder piston return vibration isolation structure according to claim 2, characterized in that, The vibration isolation ring (4) has a slot (43) at one end of the opening (42) and a block (44) adapted to and slidably connected to the slot (43) at the other end, and the groove wall of the slot (43) extends through the inner and / or outer sides of the vibration isolation ring (4).
4. The master cylinder piston return vibration isolation structure according to claim 3, characterized in that, The card block (44) has an inclined surface (441) on the inner and / or outer side of the vibration isolation ring (4).
5. The master cylinder piston return vibration isolation structure according to claim 1, characterized in that, The vibration isolation ring (4) has multiple through holes (45) extending through it in the radial direction, and each of the through holes (45) is evenly distributed in the circumferential direction of the multiple through holes (45).
6. The master cylinder piston return vibration isolation structure according to claim 1, characterized in that, The positioning ring (3) has a slot (31) on its outer side. The slot (31) is a ring structure, and the upper side of the positioning ring (3) corresponding to the slot (31) abuts against the vibration isolation ring (4).
7. A master cylinder piston return vibration isolation structure according to any one of claims 1-6, characterized in that, It also includes an oil passage block (5) whose upper end is fixedly connected to the bracket (1), a second piston rod (6) whose upper end slides in the oil passage block (5), a return spring (7) installed in the oil passage block (5), and a push rod (8) whose lower end is inserted into the upper part of the stepped hole (11) and pressed onto the first piston rod (2). The lower end of the first piston rod (2) is slidably connected in the oil passage block (5), the upper end of the return spring (7) abuts against the first piston rod (2), and the lower end abuts against the second piston rod (6).
8. The master cylinder piston return vibration isolation structure according to claim 7, characterized in that, At least one rubber cup (51) is press-fitted into the inner wall of the oil passage block (5), and each rubber cup (51) is pressed against the outer wall of the first piston rod (2).
9. The master cylinder piston return vibration isolation structure according to claim 7, characterized in that, The first piston rod (2) has a slot at its upper end; it also includes an elastic adapter (9) installed in the slot of the first piston rod (2). The elastic adapter (9) includes a retaining cylinder (91) with its lower end pressed against the lower end of the push rod (8), a retaining spring (92) with its lower end abutting against the retaining cylinder (91), and a press-fit elastic member (93) with its lower side abutting against the retaining spring (92). The press-fit elastic member (93) is snapped into the first piston rod (2).
10. A brake-by-wire system, characterized in that, Including a master cylinder piston return vibration isolation structure as described in any one of claims 1-9.