Pedal feeling simulator for brake system

Abstract

The pedal feeling simulator for the brake system comprises a valve block, a sealing leather cup, a sealing ring, a steel cable baffle ring, an end cover, a buffer cushion, a first spring, a spring seat, a second spring, a piston, an oil inlet, a supporting seat and a piston guide sleeve, the piston is assembled in a hole of the valve block, and the sealing leather cup is assembled in a leather cup groove of the valve block; the sealing ring is assembled in the groove of the end cover; the steel cable baffle ring is assembled in the valve block groove; the first spring and the spring seat are assembled in the piston hole; a piston guide sleeve is arranged between the piston and the end cover; the bottom of the piston guide sleeve is provided with a through hole allowing the belly portion of the supporting seat to penetrate through, the belly portion of the supporting seat penetrates through the bottom through hole of the piston guide sleeve and then abuts against the bottom of the end cover, and the wing portion of the supporting seat is located in the piston guide sleeve and makes contact with the bottom of the piston guide sleeve. And the second spring is assembled between the spring seat and the supporting seat. The problem of friction between metal parts is solved, and meanwhile the pedal force-stroke curve of the third section is easier to adjust.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of brake systems, and in particular to a pedal feel simulator for a brake system. Background Art

[0002] At present, electric brake boosters have been widely used in traditional fuel vehicles, especially new energy vehicles. Compared with traditional vacuum boosters, electric brake boosters no longer require a vacuum source and rely entirely on motors to provide brake assistance, becoming an inevitable trend to replace vacuum boosters. With the development of electrification and intelligent driving technology, intelligent integrated braking systems have become a new trend. It combines the anti-lock braking system (ABS) / electronic stability control system (ESC) and electric brake booster system to form a OneBox solution, which can realize the functions of boosters, anti-lock braking and vehicle steady-state control. The integrated brake booster mainly includes a hydraulic control valve block, a pedal feel simulator part, a pressure generating device, a control unit & sensor part, and a drive motor. The pedal feel simulator has the main function of providing the driver with a suitable pedal feel and simulating the pedal feedback force and stroke. At the same time, it needs to meet the vehicle's use environment and life requirements.

[0003] The existing technical solution is to simulate the pedal force and stroke by using a spring plus a rubber block. During the pedal braking process, the small spring, the large spring, and the rubber block are compressed in sequence, thereby simulating three sections of pedal force-stroke curves with different slopes. When the pedal is stepped on to a certain position, it enters the first section of the pedal force-stroke curve, the brake fluid enters the left end cavity of the simulator from the oil inlet, and the brake fluid pushes the piston to move to the right. At this time, since the preload force of the small spring is the smallest, the small spring is pushed and compressed, the piston reaction force increases, and the brake fluid pressure entering the simulator increases accordingly, so that the pedal feedback force increases accordingly. Continue to step on the pedal until the spring seat contacts the end cover, enter the second section of the pedal force-stroke curve, the large spring begins to be compressed, the piston reaction force continues to increase, the brake fluid pressure in the simulator continues to increase, and the pedal feedback force continues to increase. Continue to step on the pedal until the push rod contacts the rubber block, enter the third section of the pedal force-stroke curve, the rubber block is squeezed and deformed by the push rod, the piston reaction force continues to increase, the brake fluid pressure in the simulator continues to increase, and the pedal feedback force continues to increase.

[0004] However, when the simulator simulates the pedal force, there will be mutual sliding friction between the piston and the valve block, between the small spring and the spring seat, between the small spring and the push rod, and between the large spring and the spring seat. The matching length between these friction surfaces is relatively short. The piston, valve block, small spring, spring seat, push rod, and large spring are all metal parts. In order to ensure the service life of each friction part, the current plan is to apply grease to these parts, but these parts do not have a reserved grease storage structure. After running for a certain period of time, lubrication abnormalities are prone to occur, resulting in abnormal noise. In addition, the amount of grease required for these parts is relatively large, and the grease cost is relatively high. In addition, the existing rubber block is small in size, and the compressible volume is correspondingly small, which makes its compression stroke small. When the stroke is too large, it is easy to be squeezed and damaged by the push rod. Summary of the invention

[0005] In view of this, an embodiment of the present application provides a pedal feel simulator for a braking system, which can at least solve the aforementioned technical problems.

[0006] According to an embodiment of the present application, a pedal feel simulator for a brake system is provided, comprising: a valve block, a sealing leather cup, a sealing ring, a wire retaining ring, an end cover, a buffer pad, a first spring, a spring seat, a second spring, a piston, an oil inlet, a support seat, and a piston guide sleeve, wherein:

[0007] The piston is assembled in the hole of the valve block, and the sealing leather cup is assembled in the leather cup groove of the valve block, forming a brake fluid pressure chamber with the valve block and the sealing leather cup;

[0008] The sealing ring is installed in the groove of the end cover to prevent the entry of foreign matter;

[0009] The wire retaining ring is installed in the valve block groove to prevent the end cover from falling off;

[0010] A piston hole for accommodating a first spring and a spring seat is provided on one side of the piston located in the valve block hole. The first spring and the spring seat are assembled in the piston hole. One side of the first spring is close to the piston, and the other side is close to the spring seat.

[0011] A piston guide sleeve is provided between the piston and the end cover to support the piston to move axially;

[0012] The support seat is a cylindrical structure with a T-shaped cross section. A through hole is provided at the bottom of the piston guide sleeve to allow the belly of the support seat to pass through. The belly of the support seat passes through the bottom through hole of the piston guide sleeve and abuts against the bottom of the end cover. The wing of the support seat is inside the piston guide sleeve and contacts the bottom of the piston guide sleeve. Under the action of pressure, the piston guide sleeve can move forward and backward along the belly of the support seat.

[0013] The second spring is assembled between the spring seat and the support seat, with one side of the second spring close to the spring seat and the other side close to the support seat.

[0014] In some exemplary embodiments, the buffer pad is located at the bottom of the end cover, between the piston guide sleeve and the end cover, and the buffer pad can be pushed and compressed by the piston guide sleeve.

[0015] In some exemplary embodiments, the pedal feel simulator further includes a drain / exhaust port, through which air or brake fluid enters and exits the brake fluid pressure chamber when the piston is pushed.

[0016] In some exemplary embodiments, the piston is a cylindrical hollow structure with one end open and is made of a metal alloy.

[0017] In some exemplary embodiments, the spring seat is made of plastic, and the inner wall and the outer wall are provided with a plurality of oil storage grooves for storing lubricating grease, and the oil storage grooves are arranged along the movement direction of the piston.

[0018] In some exemplary embodiments, the piston guide sleeve is made of plastic, and the inner wall and the outer wall are provided with a plurality of oil storage grooves for storing lubricating grease, and the oil storage grooves are arranged along the movement direction of the piston.

[0019] In some exemplary embodiments, the piston guide sleeve is a cylindrical structure with an opening at one end and a through hole at the other end; the inner wall has a uniform diameter for guiding the piston; and the outer wall has inconsistent front and rear diameters for mounting in conjunction with the end cover.

[0020] In some exemplary embodiments, the end cover is a cylindrical structure with an open end and inner and outer wall diameters that are inconsistent. It is made of metal, and the outer wall is provided with a groove that matches the sealing ring and a recessed portion that matches the drain / exhaust port 21, and the inner wall is provided with a recessed portion that matches the piston guide sleeve.

[0021] In some exemplary embodiments, the buffer pad is made of elastic material.

[0022] In some exemplary embodiments, the buffer pad is a rubber gasket or a metal spring.

[0023] In the embodiment of the present application, by arranging a piston guide sleeve made of plastic material at the inevitable sliding friction part, such as between the piston and the end cover, the matching length of the friction surface is increased while the support stability is increased. At the same time, the spring seat and the piston guide sleeve are both made of plastic material with self-lubricating properties, and the friction between plastic and metal replaces the original friction between metal and metal, thereby increasing the service life of each friction part. In addition, an oil storage tank is designed on the spring seat and the piston guide sleeve made of plastic material to reduce the amount of grease used. A larger buffer pad is used to replace the original rubber block, so that the pedal force-stroke curve of the third section is easier to adjust. At the same time, a drain / exhaust port is provided, and when the piston is pushed, air or brake fluid enters and exits the brake fluid pressure chamber through the drain / exhaust port. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 A schematic diagram showing the structure of a pedal feel simulator for a brake system according to an embodiment of the present application is shown;

[0026] Figure 2 A schematic diagram of the piston structure of an embodiment of the present application is shown;

[0027] Figure 3 A schematic diagram of the spring seat structure of an embodiment of the present application is shown;

[0028] Figure 4 A schematic diagram of the structure of a piston guide sleeve in an embodiment of the present application is shown;

[0029] Figure 5 A schematic diagram of an end cover of an embodiment of the present application is shown;

[0030] Figure 6 A schematic diagram of the structure of a buffer pad according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0031] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0032] The essence of the technical solution of the embodiment of the present application is explained in detail below with reference to the accompanying drawings.

[0033] Figure 1 FIG. 1 shows a schematic diagram of the structure of a pedal feel simulator for a brake system according to an embodiment of the present application. Figure 1 As shown, the brake system pedal feel simulator of the embodiment of the present application includes: a valve block 1, a sealing leather cup 2, a sealing ring 3, a wire retaining ring 4, an end cover 6, a buffer pad 7, a first spring 8, a spring seat 9, a second spring 10, a piston 12, an oil inlet 13, a support seat 22, and a piston guide sleeve 23, wherein:

[0034] The piston 12 is assembled in the hole of the valve block 1, and the sealing leather cup 2 is assembled in the leather cup groove of the valve block 1, forming a brake fluid pressure chamber with the valve block 1 and the sealing leather cup 2, so that the thrust of the piston 12 and the brake fluid pressure can be converted to each other.

[0035] The sealing ring 3 is assembled in the groove of the end cover 6 to prevent foreign matter from entering the simulator;

[0036] The wire retaining ring 4 is assembled in the groove of the valve block 1 to prevent the end cover 6 from falling off from the valve block 1;

[0037] Figure 2 Schematic diagram of the piston structure of the embodiment of the present application, such as Figure 2 As shown, in the embodiment of the present application, the piston 12 is a cylindrical hollow structure with one end open, and is made of a metal alloy, such as an aluminum alloy. A piston 12 hole for accommodating the first spring 8 and the spring seat 9 is provided on one side of the piston 12 located in the hole of the valve block 1. The first spring 8 is a small spring. The first spring 8 and the spring seat 9 are assembled in the piston 12 hole. One side of the first spring 8 is close to the piston 12, and the other side is close to the spring seat 9. The first spring 8 can be compressed between the piston 12 and the spring seat 9. Figure 3 Schematic diagram of the spring seat structure of the embodiment of the present application, as shown in Figure 3 As shown, in the embodiment of the present application, the spring seat 9 is made of plastic, and the inner wall and the outer wall are provided with a plurality of oil storage grooves 31 for storing lubricating grease, and the oil storage grooves 31 are arranged along the movement direction of the piston 12.

[0038] A piston guide sleeve 23 is arranged between the piston 12 and the end cover 6 to support the axial movement of the piston 12; the piston guide sleeve 23 is made of plastic, and the inner and outer walls are provided with multiple oil storage grooves 32 for storing lubricating grease, and the oil storage grooves are arranged along the movement direction of the piston 12. Figure 4 Schematic diagram of the piston guide sleeve structure of the embodiment of the present application, as shown in Figure 4 As shown, in the embodiment of the present application, the piston guide sleeve 23 is a cylindrical structure with an opening at one end and a through hole at the other end; the inner wall diameter is consistent and is used to guide the piston 12; the outer wall front and rear diameters are inconsistent and are used to cooperate with the end cover 6 for installation.

[0039] Figure 5 Schematic diagram of the end cover of the embodiment of the present application, such as Figure 5 As shown, the end cover 6 is a cylindrical structure with an opening at one end and inconsistent inner and outer wall diameters. It is made of metal, and the outer wall is provided with a groove 33 that matches the sealing ring 3, and a recessed portion 34 that matches the drain / exhaust port 21, and the inner wall is provided with a recessed portion 35 that matches the piston guide sleeve 23.

[0040] The support seat 22 is a cylindrical structure with a T-shaped cross section. The bottom of the piston guide sleeve 23 is provided with a through hole allowing the belly of the support seat 22 to pass through. The belly of the support seat 22 passes through the bottom through hole of the piston guide sleeve 23 and abuts against the bottom of the end cover 6. The wing of the support seat 22 is inside the piston guide sleeve 23 and contacts the bottom of the piston guide sleeve 23. Under the action of pressure, the piston guide sleeve 23 can move forward and backward along the belly of the support seat 22.

[0041] The second spring 10 is a large spring, which is assembled between the spring seat 9 and the support seat 22. One side of the second spring 10 is close to the spring seat 9, and the other side is close to the support seat 22. After the piston 12 moves to contact the spring seat 9, when the piston 12 continues to move, the second spring 10 can be compressed by pushing the spring seat 9.

[0042] The buffer pad 7 is located at the bottom of the end cover 6, between the piston guide sleeve 23 and the end cover 6, and the buffer pad 7 can be pushed and compressed by the piston guide sleeve 23. After the piston 12 is pressed to the end of the piston guide sleeve 23, the piston 12 can push the piston guide sleeve 23 to compress the buffer pad 7. Compared with the prior art, the buffer pad 7 is larger in volume and is made of elastic material. In the embodiment of the present application, the buffer pad 7 is a rubber gasket or a metal spring. Figure 6 Schematic diagram of a buffer pad structure according to an embodiment of the present application. Figure 6 As shown, the buffer pad is a rubber pad. In practical applications, the buffer pad 7 is not limited to Figure 6 The material and shape can be adjusted as needed, provided that the required resilience and service life are provided.

[0043] The inner chamber of the pedal simulator may be filled with air or brake fluid. The pedal feel simulator further comprises a drain / exhaust port 21 . When the piston 12 is pushed, air or brake fluid enters and exits the brake fluid pressure chamber through the drain / exhaust port 21 .

[0044] The above structure enables the piston 12 to compress the first spring 8, the second spring 10 and the buffer pad 7 in sequence within different moving ranges, so that the brake fluid in the brake fluid pressure chamber generates different pressures, and finally generates different pedal forces. The first spring 8, the second spring 10 and the buffer pad 7 have different preload forces and stiffnesses. They provide reaction forces within different moving distances of the piston 12, so that the brake fluid in the brake fluid pressure chamber generates different pressures, and finally generates different pedal forces, and finally forms a pedal force-displacement curve.

[0045] In the embodiment of the present application, a piston guide sleeve 23 made of plastic material is provided at the inevitable sliding friction part, such as between the piston 12 and the end cover 6, to lengthen the matching length of the friction surface and increase the support stability. At the same time, the spring seat 9 and the piston guide sleeve 23 are both made of plastic material with self-lubricating properties, and the friction between plastic and metal replaces the original friction between metal and metal, thereby increasing the service life of each friction part. In addition, an oil storage tank is designed on the spring seat 9 and the piston guide sleeve 23 made of plastic material to reduce the amount of grease. A larger volume of buffer pad 7 is used to replace the original rubber block, so that the pedal force-stroke curve of the third section is easier to adjust. The buffer pad 7 can be made of rubber or metal shrapnel, and its shape can also be adjusted as needed, as long as it can provide rebound force and have a corresponding life. A drain / exhaust port 21 is provided, and when the piston 12 is pushed, air or brake fluid enters and exits the brake fluid pressure chamber through the drain / exhaust port 21.

[0046] It should be understood that "one embodiment" or "an embodiment" mentioned throughout the specification means that specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present invention. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. It should be understood that in various embodiments of the present invention, the size of the sequence number of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present application. The above-mentioned sequence numbers of the embodiments of the present application are for description only and do not represent the advantages and disadvantages of the embodiments.

[0047] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0048] The units described above as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units; some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0049] The above is only an embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A brake system pedal feel simulator, characterized in that: include: Valve block, sealing leather cup, sealing ring, wire retaining ring, end cover, buffer pad, first spring, spring seat, second spring, piston, oil inlet, support seat, piston guide sleeve, among which, The piston is assembled in the hole of the valve block, and the sealing leather cup is assembled in the leather cup groove of the valve block, forming a brake fluid pressure chamber with the valve block and the sealing leather cup; The sealing ring is installed in the groove of the end cover to prevent the entry of foreign matter; The wire retaining ring is installed in the valve block groove to prevent the end cover from falling off; A piston hole for accommodating a first spring and a spring seat is provided on one side of the piston located in the valve block hole. The first spring and the spring seat are assembled in the piston hole. One side of the first spring is close to the piston, and the other side is close to the spring seat. A piston guide sleeve is provided between the piston and the end cover to support the piston to move axially; The support seat is a cylindrical structure with a T-shaped cross section. A through hole is provided at the bottom of the piston guide sleeve to allow the belly of the support seat to pass through. The belly of the support seat passes through the bottom through hole of the piston guide sleeve and abuts against the bottom of the end cover. The wing of the support seat is inside the piston guide sleeve and contacts the bottom of the piston guide sleeve. Under the action of pressure, the piston guide sleeve can move forward and backward along the belly of the support seat. The second spring is assembled between the spring seat and the support seat, with one side of the second spring close to the spring seat and the other side close to the support seat.

2. The brake system pedal feel simulator according to claim 1, characterized in that: The buffer pad is located at the bottom of the end cover, between the piston guide sleeve and the end cover, and the buffer pad can be pushed and compressed by the piston guide sleeve.

3. The brake system pedal feel simulator according to claim 1, characterized in that: The pedal feel simulator also includes a drain / exhaust port through which air or brake fluid enters and exits the brake fluid pressure chamber when the piston is pushed.

4. The brake system pedal feel simulator according to claim 1, characterized in that: The piston is a cylindrical hollow structure with an open end, and is made of a metal alloy.

5. The brake system pedal feel simulator according to claim 1, characterized in that: The spring seat is made of plastic material, and the inner wall and the outer wall are provided with a plurality of oil storage grooves for storing lubricating grease, and the oil storage grooves are arranged along the movement direction of the piston.

6. The brake system pedal feel simulator according to claim 1, characterized in that: The piston guide sleeve is made of plastic material, and the inner wall and the outer wall are provided with a plurality of oil storage grooves for storing lubricating grease, and the oil storage grooves are arranged along the movement direction of the piston.

7. The brake system pedal feel simulator according to claim 6, characterized in that: The piston guide sleeve is a cylindrical structure with an opening at one end and a through hole at the other end; the inner wall has a uniform diameter and is used to guide the piston; the outer wall has inconsistent front and rear diameters and is used to be installed in conjunction with the end cover.

8. The brake system pedal feel simulator according to claim 7, characterized in that: The end cover is a cylindrical structure with an opening at one end and inconsistent inner and outer wall diameters. It is made of metal, and the outer wall is provided with a groove that matches the sealing ring and a recessed portion that matches the drain / exhaust port 21, and the inner wall is provided with a recessed portion that matches the piston guide sleeve.

9. The brake system pedal feel simulator according to claim 1, characterized in that: The buffer pad is made of elastic material.

10. The brake system pedal feel simulator according to claim 9, characterized in that: The buffer pad is a rubber pad or a metal spring.

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