CN213892462U

CN213892462U - Active brake pedal stroke simulator

Info

Publication number: CN213892462U
Application number: CN202022990407.7U
Authority: CN
Inventors: 初亮; 李世博; 许炎武; 赵迪; 常城; 曹卓; 邢家铭
Original assignee: Jilin University
Current assignee: Jilin University
Priority date: 2020-12-10
Filing date: 2020-12-10
Publication date: 2021-08-06
Anticipated expiration: 2030-12-10

Abstract

The utility model discloses an active brake pedal stroke simulator aims at overcoming prior art and has too high to hydraulic pressure regulating unit performance requirement, utilizes insufficient problem to current part. The simulator comprises a simulator driving mechanism and a simulator executing mechanism. The simulator driving mechanism comprises a motor controller, a motor, a driving gear, a toothed internal circulation nut, a ball, a screw mandrel ejector rod, a thrust bearing, a limit switch, a rear cover and a partition plate. The simulator actuating mechanism comprises a second piston, a second piston spring, a first piston spring, a third piston spring seat and a simulator cylinder. The simulator cylinder body is connected with the partition plate through three partition plate connecting bolts, the rear cover is connected with the partition plate through seven rear cover connecting rivets, the motor is connected with the partition plate through two motor fixing bolts, and the third piston is sleeved on a slide bar part of the screw mandrel.

Description

Active brake pedal stroke simulator

Technical Field

The utility model relates to an active brake pedal stroke simulator who is applied to car braking system field, more exactly, the utility model relates to an active brake pedal stroke simulator.

Background

In recent years, with the progress of artificial intelligence technology, it has become possible to use a robot instead of a human to complete a driving task, an unmanned vehicle will inevitably become one of the development trends of future automobile technology, and an intelligent driving system will eventually replace a human to drive an automobile. The emergence of intelligent driving systems puts new and higher demands on braking systems, the newly introduced intelligent driving functions require that the braking systems can realize brake-by-wire through commands, the braking systems are ensured to have higher availability, and all key functions including brake-by-wire have redundant backup and are not limited to traditional conventional braking mechanical backup. To meet these needs, the brake-by-wire system components should have higher pressure regulation capability, and at the same time, a pedal stroke simulation function should be added, so that the brake pedal of the brake-by-wire system still has a pedal feel close to that of the conventional brake pedal.

To solve this problem, manufacturers and research institutions abroad usually solve the problem by completely redesigning the hydraulic brake system, such as the chinese patent publication No. CN101927758A of the margani power transmission system and the biggio company, the publication date of which is 12 months and 29 days 2010, and the invention name of which is "brake pedal simulator and brake system"; the invention relates to a travel simulator and a brake control device, which are disclosed as Chinese patent publication No. CN102066167A of Toyota automotive Co., Ltd, 5-month-2011 and 18-day; chinese patent publication No. CN102256842A of robert bosch limited, publication No. 11/23/2011, entitled "brake booster working as pedal simulator and brake booster designed accordingly", and chinese patent publication No. CN102582595A of eipidate gmbh, publication No. 7/18/2012, entitled "stroke simulation device".

For domestic automobile manufacturers, because of relative scarcity of component resources and technologies, completely redesigning a hydraulic braking system will face the problems of great difficulty, long period and high cost, and is not favorable for market competition. At present, only Zhejiang Asia Tai machine electric company Limited in China has the Chinese patent publication (announcement) number of CN101879891A, the publication (announcement) date of 11 and 10 months in 2010 and the Chinese patent application number of CN201010214778.4, and the invention name is the automobile brake pedal feeling simulator; the Chinese patent publication (notice) number is CN102294997A, the publication (notice) date is 2011, 12 and 28, the Chinese patent application number is CN201110160378.4, the invention name is 'automobile brake pedal feeling simulator', and two improved schemes based on the existing hydraulic brake system are provided. When the two schemes realize pressure adjustment, the performance requirement on the hydraulic adjusting unit exceeds the capability of the existing product, and the utilization of the existing component resources is still insufficient.

Therefore, there is a need to develop a device that can realize an active pressure adjustment function and a pedal feel simulation function without greatly changing components of a raw hydraulic brake system, so as to cooperate with a brake-by-wire system to complete a braking process. Therefore, on one hand, the functional requirements of the brake-by-wire system can be met, and meanwhile, the research and development cost and the production cost can be reduced, and the research and development period is shortened.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that it has surpassed the ability of current product to have overcome prior art existence to the performance requirement of hydraulic pressure regulating unit, still insufficient problem to the utilization of current part resource provides an active brake pedal stroke simulator.

In order to solve the technical problem, the utility model discloses an adopt following technical scheme to realize:

the active brake pedal stroke simulator comprises a simulator driving mechanism and a simulator executing mechanism; the simulator driving mechanism comprises a motor controller, a motor, a driving gear, a toothed internal circulation nut, a ball, a screw mandrel ejector rod, a limit switch, a rear cover, a partition plate, a first thrust bearing and a second thrust bearing; the simulator executing mechanism comprises a second piston, a second piston spring, a second piston sealing ring, a first piston spring, a third piston spring seat retaining ring, a third piston sealing ring and a simulator cylinder body;

the simulator cylinder body is arranged on the right end face of the partition plate through a bolt, the rear cover is arranged on the left end face of the partition plate through a rivet, the toothed internal circulation nut is arranged between the rear cover and the partition plate through a first thrust bearing and a second thrust bearing, the left end of the lead screw ejector rod is arranged in a central hole of the toothed internal circulation nut and is in rolling connection, the right end of the lead screw ejector rod is inserted into a stepped hole of the simulator cylinder body, a third piston is sleeved on the right end of the lead screw ejector rod, the left end of the third piston is sleeved on the second piston, the right end of the third piston is sleeved on the first piston, a third piston spring and a third piston spring seat are sequentially sleeved on the third piston, a third piston spring seat check ring is arranged in a circular groove at the left end of the third piston, the second piston is sleeved in a first section stepped hole of the simulator cylinder body, the second piston is sleeved on the second piston, the first piston on the right side of the second piston is sleeved in a second section stepped hole of the simulator cylinder body, the first piston spring is sleeved on the first piston, the motor is installed on the right end face of the partition plate below the simulator cylinder body, the driving gear is sleeved on an output shaft of the motor and connected in an interference fit mode, the driving gear is connected with the toothed internal circulation nut in a meshing mode, the motor controller is installed on the right end face of the motor shell, the motor is connected with the motor controller through an electric wire, the limit switch is installed in the center of the rear cover, and the limit switch is connected with the motor controller through a limit switch signal wire.

The toothed internal circulation nut is a disc-type structural member, a cylindrical boss is arranged at the right end of the toothed internal circulation nut, the circle center of the boss is overlapped with the center of the toothed internal circulation nut, teeth meshed with a driving gear are arranged on the outer cylindrical surface of the toothed internal circulation nut, a central through hole is formed in the center of the toothed internal circulation nut, and a spiral raceway for mounting balls is arranged on the inner cylindrical surface of the central through hole.

The screw mandrel ejector rod in the technical scheme is composed of a left section and a right section, wherein the left section is a screw mandrel which is matched with a central through hole of a toothed internal circulation nut and a ball and is provided with a spiral raceway, and the right section is a cylindrical sliding rod with a smooth surface; the rolling connection of the left end of the screw mandrel ejector rod in the center hole of the internal circulation nut with teeth means that: and balls are filled in the spiral raceway on the central through hole of the internal circulation nut with teeth and the spiral raceway on the screw rod in the screw rod ejector rod.

In the technical scheme, a boss at the right end of the internal circulation nut with teeth is sleeved with a second thrust bearing and is in contact connection, the right end face of the internal circulation nut with teeth is in contact connection with the left end face of the second thrust bearing, the second thrust bearing is sleeved in an annular boss at the left end face of a partition board and is in contact connection, the right end face of the second thrust bearing is in contact connection with the left end face of the partition board, the left end face of the internal circulation nut with teeth is in contact connection with the right end face of a first thrust bearing, the first thrust bearing is sleeved in contact connection with the annular boss at the inner side of a rear cover, and the left end face of the first thrust bearing is in contact connection with the end face of the rear cover.

According to the technical scheme, the simulator cylinder body is a cylindrical structural part, the left end and the right end of the simulator cylinder body are both open, a flange plate used for installation is arranged on the outer cylindrical surface of a left end cylinder opening, three bolt holes are uniformly distributed in the flange plate, a three-section cylindrical stepped hole is machined along the central axis of the simulator cylinder body, the diameter of the three-section stepped hole is gradually decreased from left to right, and is a first-section stepped hole, a second-section stepped hole and a third-section stepped hole in sequence, wherein a second piston and a second piston spring are installed in the first-section stepped hole, the first piston and the first piston spring are installed in the second-section stepped hole, the third-section stepped hole is an oil inlet and outlet hole of the simulator cylinder body and is machined into an internal threaded hole, vent holes are further machined in the cylindrical stepped hole of the first section, the three-section cylindrical stepped holes are mutually communicated and the rotation axis is collinear.

In the technical scheme, a first piston and a second piston are sequentially arranged in a first section of stepped hole and a second section of stepped hole of a simulator cylinder body and are in sliding connection, a third piston is sleeved in the first piston and is in sliding connection, a second piston sealing ring and a third piston sealing ring are respectively sleeved in annular grooves of the second piston and the third piston, a first piston spring is sleeved on an annular boss on the second end surface on the left side of the first piston, the left end surface of the first piston spring is in contact connection with the bottom surface of an annular boss on the right end surface of the second piston, the right end surface of the first piston spring is in contact connection with the bottom surface of an annular boss on the left end surface of the first piston, a second piston spring and a third piston spring are respectively arranged on left end shafts of the second piston and the third piston, the left end surface of the second piston spring is in contact connection with the right end surface of a partition plate, and the right end surface of the second piston spring is in contact connection with the left end surface of a large shaft of the second piston, the third piston spring seat suit is transition fit at the third piston left end, and the left end face of third piston spring is connected with the right-hand member face contact of third piston spring seat, and the right-hand member face of third piston spring is connected with the left end face contact of the little diametric axis of first piston, and third piston spring seat retaining ring is installed in the circular recess of third piston left end, and the left end face of third piston spring seat is connected with the right-hand member face contact of third piston spring seat retaining ring.

The third piston in the technical scheme is a two-section stepped shaft, the right end shaft diameter is larger, an annular groove for placing a sealing ring is processed on the cylindrical surface of the right end shaft, the left end shaft diameter is smaller and used for installing a third piston spring, a circular groove for placing a third piston spring seat check ring is processed on the cylindrical surface of the left end shaft, a circular hole is processed on the left end shaft along the rotation center line of the stepped shaft, and the diameter of the hole is slightly larger than that of a slide bar of a screw mandrel ejector rod; the first piston is a two-section stepped shaft, the right end shaft diameter is larger, the left end shaft diameter is smaller, the left end shaft diameter is used for mounting a third piston spring, an annular boss is arranged on the left end face of the shaft with the larger diameter and used for mounting the first piston spring, a circular stepped hole is machined along the rotation center line of the stepped shaft, the diameter of the right end of the stepped hole is larger and equal to the shaft diameter of the right end of the third piston, and the diameter of the left end of the stepped hole is smaller and equal to the shaft diameter of the left end of the third piston; the second piston is a two-section stepped shaft, the right end shaft diameter is large, a circular boss is arranged on the right end face and used for mounting a first piston spring, an annular groove used for placing a sealing ring is processed on the cylindrical surface of the right end shaft, the left end shaft diameter is small and used for mounting a second piston spring, a circular through hole is processed along the rotation center line of the stepped shaft, and the diameter of the through hole is slightly larger than that of the left end shaft of the first piston.

According to the technical scheme, the rotary axes of the first piston, the second piston, the third piston spring seat, the lead screw ejector rod, the toothed internal circulation nut, the first thrust bearing, the second thrust bearing and the simulator cylinder body are collinear, the rotary axis of the output shaft of the motor is collinear with the rotary axis of the driving gear, and the rotary axis of the output shaft of the motor is parallel to the rotary axes of the first piston, the second piston, the third piston spring seat, the lead screw ejector rod, the toothed internal circulation nut, the first thrust bearing, the second thrust bearing and the simulator cylinder body.

Compared with the prior art, the beneficial effects of the utility model are that:

1. active brake pedal stroke simulator integrated level high, the function of self is complete relatively, and the interface is simple, integration that can be convenient is in the middle of current hydraulic braking system. Automobile manufacturers only need to change a brake pipeline and add a small amount of electromagnetic valves, and then the brake pipeline can be connected into a traditional hydraulic brake system.

2. Active brake pedal stroke simulator integrated footboard sensation simulation function and integrated initiative pressure boost, pressurize, initiative decompression pressure modulation function as an organic whole, compensatied the not enough of traditional hydraulic pressure regulating unit pressure regulating capacity. The two functions can be added on the basis of the traditional hydraulic braking system by automobile manufacturers, and the flexibility and the accuracy of the adjustment of the hydraulic braking system are improved.

3. Active brake pedal stroke simulator adopt the elastic element of two kinds of different rigidity to simulate the footboard sensation for simulation footboard power curve is closer with traditional footboard power curve, thereby can make the footboard sensation more press close to traditional hydraulic braking system.

4. Active brake pedal stroke simulator can install in hybrid vehicle and electric automobile's braking system, through accurate brake pressure regulation, can let hydraulic braking and the better cooperation of motor braking, the ability of furthest's performance motor regenerative braking promotes hybrid vehicle and electric automobile's economic nature by a wide margin.

5. Active brake pedal stroke simulator can install in drive-by-wire braking system, both can simulate the footboard sensation in conventional braking system braking process, can realize pressure modulation such as pressure boost, pressurize, decompression as backup braking system again after conventional braking system became invalid to satisfy the emergent braking demand under the emergency, furthest has ensured driving safety.

Drawings

The invention will be further described with reference to the accompanying drawings:

FIG. 1 is a front view of an active brake pedal travel simulator in accordance with the present invention;

FIG. 2 is a right side view of the active brake pedal travel simulator of the present invention;

in the figure: 1. a toothed internal circulation nut, 2, a second thrust bearing, 3, a first thrust bearing, 4, a limit switch, 5, a screw mandrel, 6, a ball, 7, a driving gear, 8, a limit switch signal line, 9, a first motor fixing bolt, 10, a motor, 11, a motor controller, 12, a second piston sealing ring, 13, a simulator cylinder, 14, a third piston sealing ring, 15, an oil inlet and outlet hole, 16, a first piston, 17, a third piston, 18, a first piston spring, 19, a third piston spring, 20, a third piston spring seat, 21, a third piston spring seat, 22, a second piston, 23, a second piston spring, 24, a vent hole, 25, a second partition connecting bolt, 26, a partition, 27, a fourth rear cover connecting rivet, 28, a rear cover, 29, a second motor fixing bolt, 30, a seventh rear cover connecting rivet, 31, a third partition connecting bolt, 32. a sixth rear cover connecting rivet, 33, a fifth rear cover connecting rivet, 34, a third rear cover connecting rivet, 35, a second rear cover connecting rivet, 36, a first partition connecting bolt, 37, a first rear cover connecting rivet.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings:

active brake pedal stroke simulator include simulator actuating mechanism and simulator actuating mechanism two parts.

Referring to fig. 1 and 2, the simulator driving mechanism includes a toothed internal circulation nut 1, a second thrust bearing 2, a first thrust bearing 3, a limit switch 4, a screw mandrel 5, a ball 6, a driving gear 7, a limit switch signal line 8, a first motor fixing bolt 9, a motor 10, a motor controller 11, a partition plate 26, a fourth rear cover connecting rivet 27, a rear cover 28, a second motor fixing bolt 29, a seventh rear cover connecting rivet 30, a sixth rear cover connecting rivet 32, a fifth rear cover connecting rivet 33, a third rear cover connecting rivet 34, a second rear cover connecting rivet 35, and a first rear cover connecting rivet 37; the simulator actuator comprises a second piston sealing ring 12, a simulator cylinder 13, a third piston sealing ring 14, an oil inlet and outlet hole 15, a first piston 16, a third piston 17, a first piston spring 18, a third piston spring 19, a third piston spring seat 20, a third piston spring seat retainer ring 21, a second piston 22, a second piston spring 23, a vent hole 24, a second partition connecting bolt 25, a third partition connecting bolt 31 and a first partition connecting bolt 36.

The toothed internal circulation nut 1 is a disc-type structural member, a cylindrical boss is arranged at the right end of the toothed internal circulation nut 1, the circle center of the boss is overlapped with the center of the toothed internal circulation nut 1, teeth meshed with the driving gear 7 are arranged on the outer cylindrical surface of the periphery of the toothed internal circulation nut 1, a central through hole is formed in the center of the toothed internal circulation nut 1, and a spiral raceway for mounting the ball 6 is arranged on the inner cylindrical surface of the central through hole.

The screw mandrel ejector rod 5 is composed of a left section and a right section, the left section is a screw mandrel which is provided with a spiral raceway and matched with a central through hole of the toothed internal circulation nut 1 and the ball 6, the right section is a cylindrical sliding rod with a smooth surface, and the screw mandrel ejector rod 5 plays a role in converting the rotary motion of the toothed internal circulation nut 1 into linear motion.

The first thrust bearing 3 and the second thrust bearing 2 can adopt a thrust ball bearing or a thrust cylindrical roller bearing, and the first thrust bearing 3 and the second thrust bearing 2 can bear the radial acting force of the toothed internal circulation nut 1 and can limit the axial displacement of the toothed internal circulation nut 1.

The simulator cylinder body 13 is a cylindrical structural member, the left end and the right end of the simulator cylinder body are both open, a flange plate for installation is arranged on the outer cylindrical surface of the left end cylinder opening, three bolt holes are uniformly distributed in the flange plate, a three-section cylindrical stepped hole is machined along the central axis of the simulator cylinder body 13, the diameter of the three-section stepped hole gradually decreases from left to right, and sequentially comprises a first section of stepped hole, a second section of stepped hole and a third section of stepped hole, wherein a second piston 22 and a second piston spring 23 are installed in the first section of stepped hole, a first piston 16 and a first piston spring 18 are installed in the second section of stepped hole, the third section of stepped hole is an oil inlet and outlet hole 15 of the simulator cylinder body 13 and is machined into an internal threaded hole, a vent hole 24 is further machined in the cylindrical wall of the first section of stepped hole, and the three-section cylindrical stepped holes are mutually communicated and have collinear rotation axes.

The partition plate 26 is a disc-type structural member, an outline of an outer circular surface of the partition plate 26 is composed of two eccentric circles and two outer tangents of the two eccentric circles, the diameter of an upper eccentric circle on the partition plate 26 is large, the diameter of a lower eccentric circle on the partition plate 26 is small, two central through holes are processed at the center of the two eccentric circles of the partition plate 26, three uniformly-distributed bolt holes, two uniformly-distributed bolt holes and seven rivet holes are further processed on the plane of the partition plate 26, the three uniformly-distributed threaded hole distribution circles are concentrically arranged with the upper eccentric circle on the partition plate 26, the two uniformly-distributed threaded hole distribution circles are concentrically arranged with the lower eccentric circle on the partition plate 26, the seven rivet hole distribution circles are concentrically arranged with the upper eccentric circle on the partition plate 26, the diameter of the three uniformly-distributed threaded hole distribution circles is small, the diameter of the seven rivet holes distribution circles is large, and a circular boss for mounting the second thrust bearing 2 is arranged on the left end surface of the partition plate 26.

The rear cover 28 is a stepped cylindrical structural member, the left end of the rear cover is closed, the right end of the rear cover is open, a central through hole for mounting the limit switch 4 is processed at the left end, the outer contour line of the outer circular surface of the cylinder opening at the right end is the same as that of the outer circular surface of the partition plate 26, a flange plate for mounting is arranged on the outer circular surface of the cylinder opening at the right end, and seven rivet holes are arranged on the flange plate and matched with the seven rivet holes on the partition plate 26 for use; two stepped holes are processed on the rear cover 28, the left-end stepped hole is a central circular hole and has a smaller diameter, the inner contour line of the right-end stepped hole has the same shape as the outer contour line of the outer circular surface of the partition 26, the two stepped holes are mutually communicated, the rotating shaft of the left-end stepped hole and the upper eccentric circular rotating shaft of the right-end stepped hole are collinear, and a circular-ring-shaped boss for mounting the first thrust bearing 3 is arranged on the left end surface of the right-end stepped hole.

The third piston 17 is a two-section stepped shaft, the right end shaft diameter is large, an annular groove for placing a third piston sealing ring 14 is processed on the cylindrical surface of the right end shaft, the left end shaft diameter is small for installing a third piston spring 19, a circular groove for placing a third piston spring seat check ring 21 is processed on the cylindrical surface of the left end shaft, a circular hole is processed on the left end shaft along the rotation center line of the stepped shaft, and the diameter of the circular hole is slightly larger than that of a slide bar of the screw mandrel push rod 5.

First piston 16 be two segmentation step shafts, the right-hand member shaft diameter is great, the left end shaft diameter is less, the left end shaft diameter is used for installing third piston spring 19, be provided with ring shape boss on the left end face of the diameter great axle for install first piston spring 18, along the processing of step shaft centre of rotation line have circular shoulder hole, the shoulder hole right-hand member diameter is great, equals with third piston 17 right-hand member shaft diameter, the shoulder hole left end diameter is less, equals with third piston 17 left end shaft diameter.

The second piston 22 is a two-section stepped shaft, the right end shaft diameter is larger, a circular boss is arranged on the right end face and used for mounting the first piston spring 18, an annular groove used for placing the second piston sealing ring 12 is processed on the cylindrical surface of the right end shaft, the left end shaft diameter is smaller and used for mounting the second piston spring 23, a circular through hole is processed along the rotation center line of the stepped shaft, and the diameter of the through hole is slightly larger than that of the left end shaft diameter of the first piston 16.

The first piston spring 18 is a cylindrical spiral spring, has low rigidity, and is mainly used for simulating the pressure volume characteristic of a wheel cylinder during low-intensity braking in a pedal stroke simulation state; the second piston spring 23 is a cylindrical coil spring with high rigidity, and mainly simulates the pressure volume characteristic of a wheel cylinder during high-intensity braking in a pedal stroke simulation state, the third piston spring 19 is a cylindrical coil spring with high rigidity, and mainly enables the third piston 17 to move towards the direction of the screw mandrel 5 (namely leftwards relative to the second piston 16) in a pressure reduction state so as to realize the function of active pressure reduction.

The third piston spring seat 20 is a circular ring-shaped structural member and is used for installing and fixing the third piston spring 19.

Third piston spring seat retaining ring 21 for the ring form structure, adopt aluminum alloy material, for the convenience of installation, processing is jagged on the ring. The third piston spring seat retainer ring 21 functions to restrict axial displacement of the third piston spring seat 20.

The second piston sealing ring 12 and the third piston sealing ring 14 are both O-shaped sealing rings and are used for sealing brake fluid.

The first rear cover connecting rivet 37, the second rear cover connecting rivet 35, the third rear cover connecting rivet 34, the fourth rear cover connecting rivet 27, the fifth rear cover connecting rivet 33, the sixth rear cover connecting rivet 32 and the seventh rear cover connecting rivet 30 are half-round rivets for connecting the rear cover 28 and the partition plate 26.

The first partition plate connecting bolt 36, the second partition plate connecting bolt 25 and the third partition plate connecting bolt 31 adopt common fine-thread hexagon bolts and are used for connecting the simulator cylinder body 13 and the partition plate 26; the first motor fixing bolt 9 and the second motor fixing bolt 29 are common fine hexagon bolts for connecting the motor 10 and the partition plate 26.

The motor 10 adopts a brush direct current permanent magnet motor, and the motor 10 is a power source of a simulator driving mechanism.

The position and the connection mode of the concrete components are as follows:

the first piston 16 and the second piston 22 are sequentially arranged in the first section stepped hole and the second section stepped hole of the simulator cylinder body 13 and are in sliding connection, the second piston sealing ring 12 is sleeved in the annular groove of the second piston 22, the third piston 17 is sleeved in the first piston 16 and is in sliding connection, and the third piston sealing ring 14 is sleeved in the annular groove of the third piston 17. The first piston spring 18 is sleeved on the circular boss on the second end face on the left side of the first piston 16, the left end face of the first piston spring 18 is in contact connection with the bottom face of the circular boss on the right end face of the second piston 22, and the right end face of the first piston spring 18 is in contact connection with the bottom face of the circular boss on the left end face of the first piston 16; a second piston spring 23 and a third piston spring 19 are respectively arranged on left end shafts of a second piston 22 and a third piston 17, the left end surface of the second piston spring 23 is in contact connection with the right end surface of the partition plate 26, the right end surface of the second piston spring 23 is in contact connection with the left end surface of the large-diameter shaft of the second piston 22, a third piston spring seat 20 is sleeved at the left end of the third piston 17 in a transition fit manner, the left end surface of the third piston spring 19 is in contact connection with the right end surface of the third piston spring seat 20, and the right end surface of the third piston spring 19 is in contact connection with the left end surface of the small-diameter shaft of the first piston 16; the pretension of the second piston spring 23 is greater than the pretension of the first piston spring 18. The third piston spring seat retainer ring 21 is installed in the circular groove at the left end of the third piston 17, and the left end surface of the third piston spring seat 20 is in contact connection with the right end surface of the third piston spring seat retainer ring 21. The motor 10 is mounted on the right end surface of the partition plate 26 below the simulator cylinder 13 by the first motor fixing bolt 9 and the second motor fixing bolt 29. The motor controller 11 is installed on the right end face of the shell of the motor 10, the terminal of the motor 10 is connected to the driving output terminal of the motor controller 11, and the motor controller 11 is connected with the braking system controller to receive the command sent by the braking system controller. The limit switch 4 is arranged at the central position of the rear cover 28, the limit switch 4 transmits the collected signals to the motor controller 11 through a limit switch signal wire 8, the limit switch 4 is a small-stroke microswitch, and when the screw mandrel 5 returns to the initial position, the screw mandrel 5 is contacted with the limit switch 4 to generate corresponding signals. The driving gear 7 is sleeved on an output shaft of the motor 10 and is in interference fit connection, and the driving gear 7 is in tooth meshing connection with the toothed internal circulation nut 1 on the outer circumferential surface. The toothed internal circulation nut 1 is sleeved on a screw rod at the left end of the screw rod ejector rod 5, a ball 6 is arranged in a spiral raceway on a central through hole of the toothed internal circulation nut 1 and a spiral raceway on the screw rod in the screw rod ejector rod 5, the ball 6 can circulate through a circulation raceway (not shown in the figure) in the toothed internal circulation nut 1, and the rotary motion of the toothed internal circulation nut 1 is converted into the linear motion of the screw rod ejector rod 5 through the ball 6. The toothed internal circulation nut 1 is installed between the rear cover 28 and the partition plate 26 through the first thrust bearing 3 and the second thrust bearing 2, a boss sleeve at the right end of the toothed internal circulation nut 1 is provided with the second thrust bearing 2 in a contact connection mode, the right end face of the toothed internal circulation nut 1 is in a contact connection mode with the left end face of the second thrust bearing 2, the second thrust bearing 2 is sleeved in a circular boss inner contact connection mode on the left end face of the partition plate 26, the right end face of the second thrust bearing 2 is in a contact connection mode with the left end face of the partition plate 26, the left end face of the toothed internal circulation nut 1 is in a contact connection mode with the right end face of the first thrust bearing 3, the first thrust bearing 3 is sleeved in a circular boss inner contact connection mode on the inner side of the rear cover 28, and the left end face of the first thrust bearing 3 is in a contact connection mode with the end face of the rear cover 28. The right slide bar part of the screw mandrel push rod 5 passes through an upper eccentric round hole on the clapboard 26 and a round hole on the third piston 17, and has a certain clearance with the two. The spindle plunger 5 can contact the third piston 17 during pressurization, but does not contact the diaphragm 26. When the screw jack 5 returns to the initial position, no interference occurs with the movement of the third piston 17. The simulator cylinder 13 is mounted on the right end face of the partition 26 by three bolts, the left end face of the simulator cylinder 13 is in contact connection with the right end face of the partition 26, and the three bolts are a first partition connecting bolt 36, a second partition connecting bolt 25 and a third partition connecting bolt 31, respectively. The rear cover 28 is mounted on the left end surface of the partition 26 by seven rivets, the right end surface of the rear cover 28 is in contact connection with the left end surface of the partition 26, and the seven rivets are a first rear cover connecting rivet 37, a second rear cover connecting rivet 35, a third rear cover connecting rivet 34, a fourth rear cover connecting rivet 27, a fifth rear cover connecting rivet 33, a sixth rear cover connecting rivet 32, and a seventh rear cover connecting rivet 30, respectively. Wherein: the rotation axes of the first piston 16, the second piston 22, the third piston 17, the third piston spring seat 20, the lead screw ejector rod 5, the toothed internal circulation nut 1, the first thrust bearing 3, the second thrust bearing 2 and the simulator cylinder 13 are collinear, the rotation axis of the output shaft of the motor 10 is collinear with the rotation axis of the driving gear 7, and the rotation axis of the output shaft of the motor 10 is parallel to the rotation axes of the first piston 16, the second piston 22, the third piston 17, the third piston spring seat 20, the lead screw ejector rod 5, the toothed internal circulation nut 1, the first thrust bearing 3, the second thrust bearing 2 and the simulator cylinder 13.

Claims

1. The active brake pedal stroke simulator is characterized by comprising a simulator driving mechanism and a simulator executing mechanism;

the simulator driving mechanism comprises a motor controller (11), a motor (10), a driving gear (7), a toothed internal circulation nut (1), a ball (6), a screw mandrel ejector rod (5), a limit switch (4), a rear cover (28), a partition plate (26), a first thrust bearing (3) and a second thrust bearing (2);

the simulator executing mechanism comprises a second piston (22), a second piston spring (23), a second piston sealing ring (12), a first piston (16), a first piston spring (18), a third piston (17), a third piston spring (19), a third piston spring seat (20), a third piston spring seat retainer ring (21), a third piston sealing ring (14) and a simulator cylinder body (13);

the simulator is characterized in that a simulator cylinder body (13) is installed on the right end face of a partition plate (26) through a bolt, a rear cover (28) is installed on the left end face of the partition plate (26) through a rivet, a toothed internal circulation nut (1) is installed between the rear cover (28) and the partition plate (26) through a first thrust bearing (3) and a second thrust bearing (2), the left end of a screw mandrel (5) is installed in a central hole of the toothed internal circulation nut (1) and is in rolling connection, the right end of the screw mandrel (5) is inserted into a stepped hole of the simulator cylinder body (13), a third piston (17) is sleeved on the right end of the screw mandrel (5), the left end of the third piston (17) is sleeved on a second piston (22), the right end of the third piston (17) is sleeved on a first piston (16), a third piston spring (19) and a third piston spring seat (20) are sequentially sleeved on the third piston (17), a third piston spring seat retainer ring (21) is arranged in a circular groove at the left end of a third piston (17), a second piston (22) is sleeved in a first section of stepped hole of a simulator cylinder body (13), a second piston spring (23) is sleeved on the second piston (22), a first piston (16) at the right side of the second piston (22) is sleeved in a second section of stepped hole of the simulator cylinder body (13), a first piston spring (18) is sleeved on the first piston (16), a motor (10) is arranged on the right end face of a partition plate (26) below the simulator cylinder body (13), a driving gear (7) is sleeved on an output shaft of the motor (10) and is in interference fit connection, the driving gear (7) is in meshing connection with a toothed internal circulation nut (1), a motor controller (11) is arranged on the right end face of a shell of the motor (10), and the motor (10) is in wire connection with the motor controller (11), the limit switch (4) is arranged at the center of the rear cover (28), and the limit switch (4) is connected with the motor controller (11) by a limit switch signal wire (8).

2. The active brake pedal stroke simulator according to claim 1, wherein the toothed internal circulation nut (1) is a disc-like structural member, a cylindrical boss is arranged at the right end of the toothed internal circulation nut (1), the center of the boss coincides with the center of the toothed internal circulation nut (1), teeth meshed with the driving gear (7) are arranged on the outer cylindrical surface of the toothed internal circulation nut (1), a central through hole is arranged at the center of the toothed internal circulation nut (1), and a spiral raceway for mounting the ball (6) is arranged on the inner cylindrical surface of the central through hole; the screw mandrel ejector rod (5) is composed of a left section and a right section, the left section is a screw mandrel which is provided with a spiral raceway and matched with a central through hole of the internal circulation nut (1) with teeth and a ball (6), the right section is a cylindrical sliding rod with a smooth surface, and the screw mandrel ejector rod (5) plays a role in converting the rotary motion of the internal circulation nut (1) with teeth into linear motion.

3. The active brake pedal stroke simulator according to claim 1, wherein the partition plate (26) is a disk-like structure, the outer contour line of the outer circumferential surface of the partition plate (26) is composed of two eccentric circles and two outer tangents of the two eccentric circles, the diameter of an upper eccentric circle on the partition plate (26) is larger, the diameter of a lower eccentric circle on the partition plate (26) is smaller, two center through holes are processed at the centers of the two eccentric circles of the partition plate (26), three uniformly distributed bolt holes, two uniformly distributed bolt holes, and seven rivet holes are further processed on the plane of the partition plate (26), the three uniformly distributed threaded hole distributed circles are concentrically arranged with the upper eccentric circle on the partition plate (26), the two uniformly distributed threaded hole distributed circles are concentrically arranged with the lower eccentric circle on the partition plate (26), the seven rivet hole distributed circles are concentrically arranged with the upper eccentric circle on the partition plate (26), and the diameter of the three uniformly distributed threaded hole distributed circles is smaller, the diameters of the seven rivet holes are larger, and a circular boss for mounting the second thrust bearing (2) is arranged on the left end face of the partition plate (26); the rear cover (28) is a stepped cylindrical structural member, the left end of the rear cover is closed, the right end of the rear cover is open, a central through hole for mounting the limit switch (4) is processed at the left end, the outer contour line of the outer circular surface of the cylinder opening at the right end is the same as the outer contour line of the outer circular surface of the partition plate (26), a flange plate for mounting is arranged on the outer circular surface of the cylinder opening at the right end, and seven rivet holes are formed in the flange plate and matched with the seven rivet holes in the partition plate (26) for use; two stepped holes are processed on the rear cover (28), the left-end stepped hole is a central round hole and is smaller in diameter, the inner contour line of the right-end stepped hole is the same as the outer contour line of the outer circular surface of the partition plate (26), the two stepped holes are mutually communicated, the rotating shaft of the left-end stepped hole is collinear with the upper eccentric circular rotating shaft of the right-end stepped hole, and a circular-ring-shaped boss for mounting the first thrust bearing (3) is arranged on the left end face of the right-end stepped hole.

4. The active brake pedal stroke simulator according to claim 1, wherein a boss at the right end of the toothed internal circulation nut (1) is sleeved with a second thrust bearing (2) in contact connection, the right end face of the toothed internal circulation nut (1) is in contact connection with the left end face of the second thrust bearing (2), the second thrust bearing (2) is sleeved in a circular boss at the left end face of the partition plate (26) in contact connection, the right end face of the second thrust bearing (2) is in contact connection with the left end face of the partition plate (26), the left end face of the toothed internal circulation nut (1) is in contact connection with the right end face of the first thrust bearing (3), the first thrust bearing (3) is sleeved in a circular boss at the inner side of the rear cover (28) in contact connection, and the left end face of the first thrust bearing (3) is in contact connection with the end face of the rear cover (28).

5. The active brake pedal stroke simulator according to claim 1, wherein the simulator cylinder (13) is a cylindrical structure, the left end and the right end of the simulator cylinder are both open, a flange plate for installation is arranged on the outer cylindrical surface of the left end cylinder opening, three bolt holes are uniformly distributed on the flange plate, a three-section cylindrical stepped hole is processed along the central axis of the simulator cylinder (13), the diameter of the three-section stepped hole is gradually decreased from left to right, and is a first-section stepped hole, a second-section stepped hole and a third-section stepped hole in sequence, wherein a second piston (22) and a second piston spring (23) are installed in the first-section stepped hole, a first piston (16) and a first piston spring (18) are installed in the second-section stepped hole, the third-section stepped hole is an oil inlet/outlet hole (15) of the simulator cylinder (13) and is processed into an internal threaded hole, and a vent hole (24) is further processed on the cylindrical wall of the first-section stepped hole, the three-section cylindrical stepped holes are communicated with each other and the rotation axes are collinear.

6. The active brake pedal stroke simulator according to claim 1, wherein the third piston (17) is a two-section stepped shaft, the right end shaft has a larger diameter, an annular groove for placing a third piston seal ring (14) is formed on the cylindrical surface of the right end shaft, the left end shaft has a smaller diameter for mounting a third piston spring (19), a circular groove for placing a third piston spring seat retainer ring (21) is formed on the cylindrical surface of the left end shaft, and a circular hole is formed on the left end shaft along the rotation center line of the stepped shaft, and the diameter of the hole is slightly larger than that of the slide rod of the screw mandrel (5);

the first piston (16) is a two-section stepped shaft, the right end shaft diameter is larger, the left end shaft diameter is smaller, the left end shaft diameter is used for mounting a third piston spring (19), a circular boss is arranged on the left end face of the shaft with the larger diameter and used for mounting the first piston spring (18), a circular stepped hole is machined along the rotation center line of the stepped shaft, the diameter of the right end of the stepped hole is larger and is equal to the shaft diameter of the right end of the third piston (17), and the diameter of the left end of the stepped hole is smaller and is equal to the shaft diameter of the left end of the third piston (17);

the second piston (22) is a two-section type stepped shaft, the right end shaft diameter is large, a circular ring-shaped boss is arranged on the right end face and used for mounting a first piston spring (18), an annular groove used for placing a second piston sealing ring (12) is processed on the cylindrical surface of the right end shaft, the left end shaft diameter is small and used for mounting a second piston spring (23), a circular through hole is processed along the center line of rotation of the stepped shaft, and the diameter of the through hole is slightly larger than that of the left end shaft of the first piston (16).

7. The active brake pedal stroke simulator according to claim 1, wherein the first piston (16) and the second piston (22) are sequentially installed in the first section of stepped hole and the second section of stepped hole of the simulator cylinder (13) and are in sliding connection, the third piston (17) is sleeved in the first piston (16) and is in sliding connection, the second piston sealing ring (12) and the third piston sealing ring (14) are respectively sleeved in the annular grooves of the second piston (22) and the third piston (17), the first piston spring (18) is sleeved on the annular boss on the second end face on the left side of the first piston (16), the left end face of the first piston spring (18) is in contact connection with the bottom face of the annular boss on the right end face of the second piston (22), the right end face of the first piston spring (18) is in contact connection with the bottom face of the annular boss on the left end face of the first piston (16), a second piston spring (23) and a third piston spring (19) are respectively arranged on a left end shaft of a second piston (22) and a left end shaft of a third piston (17), the left end surface of the second piston spring (23) is in contact connection with the right end surface of a partition plate (26), the right end surface of the second piston spring (23) is in contact connection with the left end surface of a large-diameter shaft of the second piston (22), a third piston spring seat (20) is sleeved at the left end of the third piston (17) in transition fit, the left end surface of the third piston spring (19) is in contact connection with the right end surface of the third piston spring seat (20), the right end surface of the third piston spring (19) is in contact connection with the left end surface of a small-diameter shaft of a first piston (16), and a third piston spring seat (21) is arranged in a circular groove at the left end of the third piston (17), the left end surface of the third piston spring seat (20) is in contact connection with the right end surface of the third piston spring seat retainer ring (21).

8. The active brake pedal travel simulator of claim 1, the simulator comprises a first piston (16), a second piston (22), a third piston (17), a third piston spring seat (20), a screw mandrel ejector rod (5), a toothed internal circulation nut (1), a first thrust bearing (3), a second thrust bearing (2) and a simulator cylinder body (13), wherein the rotary axes of an output shaft of a motor (10) and a driving gear (7) are collinear, and the rotary axis of an output shaft of the motor (10) is parallel to the rotary axes of the first piston (16), the second piston (22), the third piston (17), the third piston spring seat (20), the screw mandrel ejector rod (5), the toothed internal circulation nut (1), the first thrust bearing (3), the second thrust bearing (2) and the simulator cylinder body (13).