CN115476829A - Braking system, double-wheel steering drive axle and automobile - Google Patents

Braking system, double-wheel steering drive axle and automobile Download PDF

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Publication number
CN115476829A
CN115476829A CN202110602061.5A CN202110602061A CN115476829A CN 115476829 A CN115476829 A CN 115476829A CN 202110602061 A CN202110602061 A CN 202110602061A CN 115476829 A CN115476829 A CN 115476829A
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CN
China
Prior art keywords
driving motor
brake
friction plate
caliper body
wheel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202110602061.5A
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Chinese (zh)
Inventor
罗朝晖
王洪军
薛伟光
林燕
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BYD Co Ltd
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BYD Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BYD Co Ltd filed Critical BYD Co Ltd
Priority to CN202110602061.5A priority Critical patent/CN115476829A/en
Publication of CN115476829A publication Critical patent/CN115476829A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/74—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive
    • B60T13/741—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive acting on an ultimate actuator
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B35/00—Axle units; Parts thereof ; Arrangements for lubrication of axles
    • B60B35/12—Torque-transmitting axles
    • B60B35/121—Power-transmission from drive shaft to hub
    • B60B35/122—Power-transmission from drive shaft to hub using gearings
    • B60B35/125—Power-transmission from drive shaft to hub using gearings of the planetary type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T1/00—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles
    • B60T1/02—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting by retarding wheels
    • B60T1/06—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting by retarding wheels acting otherwise than on tread, e.g. employing rim, drum, disc, or transmission or on double wheels
    • B60T1/065—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting by retarding wheels acting otherwise than on tread, e.g. employing rim, drum, disc, or transmission or on double wheels employing disc
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/74—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive
    • B60T13/746—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive and mechanical transmission of the braking action

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • Braking Arrangements (AREA)

Abstract

The invention belongs to the technical field of automobile braking systems, and relates to a braking system, a double-wheel steering drive axle and an automobile. The application discloses braking system realizes braking separately to each wheel of the double wheels with one side.

Description

Braking system, double-wheel steering drive axle and automobile
Technical Field
The invention belongs to the technical field of automobile brake systems, and relates to a brake system, a double-wheel steering drive axle and an automobile.
Background
The two-wheel drive axle in the prior art is a brake with left and right double wheels respectively arranged independently, brake air pressure or brake oil pressure is distributed to a brake cylinder through a brake pedal, a brake master pump and a brake pipeline, and the brake cylinder applies acting force to a brake lining of a brake disc or a brake shoe of a brake drum to generate a braking action on the brake disc or the brake drum. The slip ratios of the left and right wheel tires need to be calculated by the ABS to distribute the braking forces of the left and right brakes. However, such a conventional mechanical brake is complex in structure, requires an air compressor or a vacuum booster pump, occupies a large space, and does not have a function of applying braking forces of different magnitudes to each of four wheels (two rigidly assembled wheels on the left and right sides).
In the conventional EMB braking system, a motor without pneumatic and hydraulic transmission is adopted to drive a set of transmission systems such as a reduction gear, a worm gear and the like to directly act on a brake disc. The brake system has a simplified structure and occupies a small space. However, the corresponding dual-wheel drive rear axle is a rigidly assembled dual-wheel structure, and it is not possible to individually brake each wheel of the dual wheels on the same side.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the braking system comprises a braking system, a double-wheel steering drive axle and an automobile, wherein the braking system comprises a braking mechanism, a brake control mechanism and a brake control mechanism.
To solve the above technical problem, in one aspect, the present invention provides a brake system. The braking system comprises a driving motor mounting steering seat, a first driving motor, a first brake, a second driving motor and a second brake, wherein the first brake, the first driving motor, the second driving motor and the second brake are arranged in an inner space formed by enclosing inner side wheels and outer side wheels which are arranged inside and outside in parallel, the first driving motor is mounted on the outer side of the lower end of the driving motor mounting steering seat, and the second driving motor is mounted on the inner side of the lower end of the driving motor mounting steering seat;
the first brake is used for braking the outer wheel, and the second brake is used for braking the inner wheel.
Optionally, the lower end of the driving motor installation steering seat is provided with a through hole extending from inside to outside, the outer end of the through hole is provided with a first installation seat, the inner end of the through hole is provided with a second installation seat, the shell of the first driving motor is fixed on the first installation seat, and the shell of the second driving motor is fixed on the second installation seat.
Optionally, the braking system further comprises a clutch device connected between the first driving motor and the second driving motor, and the clutch device is used for controlling the connection and disconnection of the output shaft of the first driving motor and the output shaft of the second driving motor.
Optionally, the braking system further includes a first speed reduction mechanism and a second speed reduction mechanism, two ends of the first driving motor respectively penetrate through the housing of the first driving motor, an outer end of an output shaft of the first driving motor is connected to an input end of the first speed reduction mechanism, and an output end of the first speed reduction mechanism is connected to the outer wheel;
two ends of the second driving motor respectively penetrate through the shell of the second driving motor, the inner end of an output shaft of the second driving motor is connected with the input end of the second speed reducing mechanism, and the output end of the second speed reducing mechanism is connected with the inner side wheel;
the clutch device is connected between the inner end of the output shaft of the first driving motor and the outer end of the output shaft of the second driving motor, and the first brake, the first speed reducing mechanism, the first driving motor, the clutch device, the second driving motor, the second speed reducing mechanism and the second brake are sequentially arranged from outside to inside.
Optionally, the clutch device is a synchronizer, the synchronizer includes an electric shifting fork, a coupling sleeve, a meshing sleeve and a coupling tooth, the electric shifting fork is fixed in a through hole of the driving motor mounting steering base, the coupling tooth is fixed at the inner end of the output shaft of the first driving motor, the coupling sleeve is provided with an inner spline hole, the coupling tooth is provided with a first outer spline which is in spline fit with the inner spline hole, the meshing sleeve is fixed at the outer end of the output shaft of the second driving motor, the meshing sleeve is provided with a second outer spline, and the coupling sleeve is normally meshed with the second outer spline through the inner spline hole so as to synchronously rotate along with the output shaft of the second driving motor;
the electronic shift fork is stirred outwards during the combination cover, the combination cover with combine the tooth spline connection, so that the output shaft of first driving motor and the combination of second driving motor's output shaft, electronic shift fork is inwards stirred during the combination cover, the combination cover with the combination tooth breaks away from, so that first driving motor's output shaft and the separation of second driving motor's output shaft.
Optionally, the first brake comprises a first brake caliper and a first brake disc fixed to the outboard wheel;
the first brake caliper comprises a first caliper body, a first outer side friction plate, a first inner side friction plate, a first caliper body support, a first guide pin shaft, a first thrust mechanism and a first electric cam mechanism, wherein the first outer side friction plate is fixed on an outer side cavity wall of an inner cavity of the first caliper body, which is opposite to an outer side surface of a first brake disc, the first inner side friction plate is positioned between an inner side surface of the first brake disc and an inner side cavity wall of the inner cavity of the first caliper body, which is opposite to the first brake disc, the first brake disc is positioned between the first outer side friction plate and the first inner side friction plate, the first caliper body support is fixed on a vehicle body, the first caliper body is connected to the first caliper body support in a sliding mode through the first guide pin shaft, the first thrust mechanism is arranged on the first caliper body, the outer end of the first thrust mechanism is connected to the first inner side friction plate, and the inner end of the first thrust mechanism protrudes out of the first caliper body; the first electric cam mechanism is used for pushing an inner end of the first thrust mechanism, so that the first thrust mechanism pushes the first inner side friction plate to move outwards and press against the inner side surface of the first brake disc and keep the first inner side friction plate, and the first electric cam mechanism continues to apply acting force, so that the first thrust mechanism generates reverse acting force to drive the first caliper body to move inwards until the first outer side friction plate presses against the outer side surface of the first brake disc.
Optionally, the first thrust mechanism includes a first cylinder and a first piston, the first cylinder is disposed in the first caliper body, the first cylinder encloses hydraulic oil, a first sliding column slidably connected in the first cylinder is disposed inside the first inner friction plate, a first end of the first piston is slidably connected in the first cylinder, and a second end of the first piston protrudes out of the first caliper body;
the first electric cam mechanism comprises a first motor and a first cam, an output shaft of the first motor is connected to the center of a base circle of the first cam, and the first motor can drive the first cam to rotate when rotating, so that the first cam pushes the second end of the first piston.
Optionally, the second brake comprises a second brake caliper and a second brake disc fixed to the inboard wheel;
the second brake caliper comprises a second caliper body, a second outer side friction plate, a second inner side friction plate, a second caliper body support, a second guide pin shaft, a second thrust mechanism and a second electric cam mechanism, wherein the second inner side friction plate is fixed on an outer side cavity wall of an inner cavity of the second caliper body, which is opposite to the inner side surface of a second brake disc, the second outer side friction plate is positioned between the inner side surface and the outer side cavity wall of the inner cavity of the second caliper body, which is opposite to the second brake disc, the second brake disc is positioned between the second outer side friction plate and the second inner side friction plate, the second caliper body support is fixed on a vehicle body, the second caliper body is slidably connected to the second caliper body support through the second guide pin shaft, the second thrust mechanism is arranged on the second caliper body, the outer end of the second thrust mechanism is connected to the second outer side friction plate, and the outer end of the second thrust mechanism protrudes out of the second friction plate; the second electric cam mechanism is used for pushing the outer end of the second thrust mechanism, so that the second thrust mechanism pushes the second outer side friction plate to move inwards and press and hold the second outer side friction plate on the outer side surface of the second brake disc, and the second electric cam mechanism continues to apply acting force, so that the second thrust mechanism generates reverse acting force to drive the second caliper body to move outwards until the second inner side friction plate presses on the inner side surface of the second brake disc.
Optionally, the second thrust mechanism includes a second cylinder and a second piston, the second cylinder is disposed in the second caliper body, the second cylinder is sealed with hydraulic oil, a second sliding column slidably connected in the second cylinder is disposed inside the second inner friction plate, a first end of the second piston is slidably connected in the second cylinder, and a second end of the second piston protrudes out of the second caliper body;
the second electric cam mechanism comprises a second motor and a second cam, an output shaft of the second motor is connected to the center of a base circle of the second cam, and the second motor can drive the second cam to rotate when rotating, so that the second cam pushes a second end of the second piston.
Optionally, the first reduction mechanism and the second reduction mechanism are two-stage planetary gear reduction mechanisms;
the first speed reducing mechanism comprises a first primary planetary gear speed reducing mechanism and a first secondary planetary gear speed reducing mechanism, a sun gear of the first primary planetary gear speed reducing mechanism is connected with the outer end of an output shaft of the first driving motor, a planet carrier of the first primary planetary gear speed reducing mechanism is connected with the sun gear of the first secondary planetary gear speed reducing mechanism, and the planet carrier of the first secondary planetary gear speed reducing mechanism is connected with an outer wheel;
the second speed reducing mechanism comprises a second primary planetary gear speed reducing mechanism and a second secondary planetary gear speed reducing mechanism, a sun gear of the second primary planetary gear speed reducing mechanism is connected with the inner end of an output shaft of the second driving motor, a planet carrier of the second primary planetary gear speed reducing mechanism is connected with a sun gear of the second secondary planetary gear speed reducing mechanism, and a planet carrier of the second secondary planetary gear speed reducing mechanism is connected with an inner side wheel.
According to the braking system provided by the embodiment of the invention, the outer wheel is driven by the first driving motor and the first planetary reduction mechanism, the inner wheel is driven by the second driving motor and the second planetary reduction mechanism, and the outer wheel and the inner wheel are respectively braked by the first brake and the second brake, so that each wheel of the two wheels on the same side is independently braked. Therefore, the braking force can be independently distributed to the four wheels on the left side and the right side (the left side and the right side are both double wheels), and the braking stability of the whole vehicle and the uniform abrasion of the tires of the single wheels are greatly improved.
On the other hand, the embodiment of the invention further provides a double-wheel steering drive axle, which comprises an inner wheel, an outer wheel and the braking system, wherein the inner wheel is arranged on the inner side of the outer wheel side by side, the upper end of the driving motor mounting steering seat penetrates through a gap between the inner wheel and the outer wheel, the output end of the first speed reducing mechanism is connected with the rim of the outer wheel, and the output end of the second speed reducing mechanism is connected with the rim of the inner wheel.
In another aspect, the embodiment of the present invention further provides an automobile, which includes the above-mentioned brake system or the dual-wheel steer-drive axle.
Drawings
FIG. 1 is a schematic illustration of a braking system provided in accordance with an embodiment of the present invention;
FIG. 2 is a schematic illustration of a first brake of the braking system provided by one embodiment of the present invention;
FIG. 3 is another schematic view of a first brake of the braking system provided in accordance with one embodiment of the present invention;
FIG. 4 is a second brake schematic of the braking system provided by one embodiment of the present invention;
fig. 5 is another schematic diagram of a second brake of the braking system according to an embodiment of the invention.
The reference numerals in the specification are as follows:
1. the driving motor is provided with a steering seat; 2. a first drive motor; 3. a first speed reduction mechanism; 31. a first primary planetary gear reduction mechanism; 32. a first secondary planetary gear reduction mechanism;
4. a first brake; 41. a first caliper body; 42. a first outer friction plate; 43. a first inner friction plate; 431. a first sliding column; 44. a first caliper body support; 45. a first guide pin shaft; 46. a first thrust mechanism; 461. a first piston; 462. hydraulic oil; 47. a first electric cam mechanism; 471. a first motor; 472. a first cam;
5. a second drive motor; 6. a second reduction mechanism; 61. a second-stage planetary gear reduction mechanism; 62. a second-stage planetary gear reduction mechanism;
7. a second brake; 71. a second caliper body; 72. a second outside friction plate; 721. a second sliding column; 73. a second inner friction plate; 74. a second caliper body support; 75. a second guide pin shaft; 76. a second thrust mechanism; 761. a second piston; 762. hydraulic oil; 77. a second electric cam mechanism; 771. a second motor; 772. a second cam;
8. a synchronizer; 81. an electric shifting fork; 82. a coupling sleeve; 83. an engagement sleeve; 84. a coupling tooth; 9. a first brake disk; 10. a second brake disk; 11. an outboard wheel; 12. an inner wheel.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1 to 5, a brake system according to an embodiment of the present invention includes a drive motor-mounted steering base 1, a first drive motor 2, a first brake 4, a second drive motor 5, and a second brake 7, where the first brake 4, the first reduction mechanism 3, the first drive motor 2, the second drive motor 5, the second reduction mechanism 6, and the second brake 7 are disposed in an inner space formed by enclosing inner wheels 14 and outer wheels 13 arranged side by side inside and outside, the first drive motor 2 is mounted on an outer side of a lower end of the drive motor-mounted steering base 1, and the second drive motor 5 is mounted on an inner side of a lower end of the drive motor-mounted steering base 1.
The first brake 4 is used for braking the outer wheel 11, and the second brake 7 is used for braking the inner wheel 13.
In an embodiment, the lower end of the driving motor mounting steering base 1 is provided with a through hole extending inside and outside, the outer end of the through hole is provided with a first mounting base (not shown in the figure), the inner end of the through hole is provided with a second mounting base (not shown in the figure), the housing of the first driving motor 2 is fixed on the first mounting base, and the housing of the second driving motor 5 is fixed on the second mounting base.
In one embodiment, the braking system further comprises a clutch device connected between the first driving motor 2 and the second driving motor 5, and the clutch device is used for controlling the connection and disconnection of the output shaft of the first driving motor 2 and the output shaft of the second driving motor 5.
In an embodiment, the braking system further includes a first speed reducing mechanism 3 and a second speed reducing mechanism 6, two ends of the first driving motor 2 respectively penetrate through the housing of the first driving motor 2, an outer end of an output shaft of the first driving motor 2 is connected to an input end of the first speed reducing mechanism 3, and an output end of the first speed reducing mechanism 3 is connected to the outer wheel 11.
The two ends of the second driving motor 5 respectively penetrate out of the shell of the second driving motor 5, the inner end of an output shaft of the second driving motor 5 is connected with the input end of the second speed reducing mechanism 6, and the output end of the second speed reducing mechanism 6 is connected with the inner side wheel 12.
The clutch device is connected between the inner end of the output shaft of the first driving motor 2 and the outer end of the output shaft of the second driving motor 5, and the first brake 4, the first speed reducing mechanism 3, the first driving motor 2, the clutch device, the second driving motor 5, the second speed reducing mechanism 6 and the second brake 7 are sequentially arranged from outside to inside.
In an embodiment, the clutch device is a synchronizer 8, the synchronizer 8 includes an electric shifting fork 81, a combination sleeve 82, a meshing sleeve 83 and a combination tooth 84, the electric shifting fork 81 is fixed in a through hole of the driving motor installation steering base 1, the combination tooth 84 is fixed at the inner end of the output shaft of the first driving motor 2, the combination sleeve 82 is provided with an inner spline hole, the combination tooth 84 is provided with a first outer spline matched with the inner spline hole, the meshing sleeve 83 is fixed at the outer end of the output shaft of the second driving motor 5, the meshing sleeve 83 is provided with a second outer spline, and the combination sleeve 82 is normally meshed with the second outer spline through the inner spline hole so as to synchronously rotate along with the output shaft of the second driving motor 5.
The electric shifting fork 81 stirs outwards during the combination cover 82, the combination cover 82 with combine tooth 84 splined connection, so that the output shaft of first driving motor 2 combines with the output shaft of second driving motor 5, the electric shifting fork 81 stirs inwards during the combination cover 82, the combination cover 82 with combine tooth 84 and break away from, so that the separation of the output shaft of first driving motor 2 and the output shaft of second driving motor 5.
In one embodiment, as shown in fig. 2 to 3, the first brake 4 includes a first brake caliper and a first brake disc 9 fixed to the outer wheel.
The first brake caliper comprises a first caliper body 41, a first outer side friction plate 42, a first inner side friction plate 43, a first caliper body support 44, a first guide pin 45, a first thrust mechanism 46 and a first electric cam mechanism 47, wherein the first outer side friction plate 42 is fixed on an outer side cavity wall of an inner cavity of the first caliper body 41 opposite to an outer side surface of a first brake disc 9, the first inner side friction plate 43 is positioned between an inner side surface of the first brake disc 9 and an inner side cavity wall of the inner cavity of the first caliper body 41 opposite to the first brake disc 9, the first brake disc 9 is positioned between the first outer side friction plate 42 and the first inner side friction plate 43, the first caliper body support 44 is fixed on a vehicle body, the first caliper body 41 is slidably connected on the first caliper body support 44 through the first guide pin 45, the first thrust mechanism 46 is arranged on the first caliper body 41, an outer end of the first thrust mechanism 46 is connected with the first inner side friction plate 43, and an inner end of the first thrust mechanism 46 protrudes out of the first caliper body 41; the first electric cam mechanism 47 is used for pushing the inner end of the first thrust mechanism 46, so that the first thrust mechanism 46 pushes the first inner friction plate 43 to move outwards and press against the inner side surface of the first brake disc 9 and hold the inner friction plate, and the first electric cam mechanism 47 continues to apply force, so that the first thrust mechanism 46 generates reverse hydraulic force to drive the first caliper body 41 to move inwards until the first outer friction plate 42 presses against the outer side surface of the first brake disc 9.
In one embodiment, the first thrust mechanism 46 includes a first cylinder (not shown) disposed in the first caliper body 41, the first cylinder encloses a hydraulic oil 462, a first sliding column 431 slidably connected to the first cylinder is disposed inside the first inner friction plate 43, a first end of the first piston 461 is slidably connected to the first cylinder, and a second end of the first piston 461 protrudes from the first caliper body 41.
The first electric cam mechanism 47 includes a first motor 471 and a first cam 472, an output shaft of the first motor 471 is connected to a base circle center of the first cam 472, and the first motor 471 can drive the first cam 472 to rotate when rotating, so that the first cam 472 pushes a second end of the first piston 461.
The electric cam mechanism can automatically control the lift of the brake cam and the clamping force of the friction plate on the brake disc according to the depth of the brake pedal, and generate braking force with different sizes. The whole mechanism is simple and reliable in structure and small in occupied space.
In one embodiment, as shown in fig. 4 to 5, the second brake 7 includes a second brake caliper and a second brake disk 10 fixed to the inner wheel.
The second brake caliper comprises a second caliper body 71, a second outer friction plate 72, a second inner friction plate 73, a second caliper body support 74, a second guide pin 75, a second thrust mechanism 76 and a second electric cam mechanism 77, wherein the second inner friction plate 73 is fixed on an outer side cavity wall of an inner cavity of the second caliper body 71 opposite to an inner side surface of the second brake disc 10, the second outer friction plate 72 is positioned between an inner side surface and an outer side cavity wall of the inner cavity of the second caliper body 71 opposite to the second brake disc 10, the second brake disc 10 is positioned between the second outer friction plate 72 and the second inner friction plate 73, the second caliper body support 74 is fixed on the vehicle body, the second caliper body 71 is slidably connected to the second caliper body support 74 through the second guide pin 75, the second thrust mechanism 76 is arranged on the second caliper body 71, an outer end of the second thrust mechanism 76 is connected to the second outer friction plate 72, and an outer end of the second thrust mechanism 76 protrudes out of the second caliper body 71; the second electric cam mechanism 77 is used for pushing the outer end of the second thrust mechanism 76, so that the second thrust mechanism 76 pushes the second outer friction plate 72 to move inwards and press against the outer side surface of the second brake disc 10 and hold the second outer friction plate, and the second electric cam mechanism 77 continues to apply a force, so that the second thrust mechanism 76 generates a reverse force to drive the second caliper body 71 to move outwards until the second inner friction plate 73 presses against the inner side surface of the second brake disc 10.
In an embodiment, the second thrust mechanism 76 includes a second cylinder and a second piston 761, the second cylinder is disposed in the second caliper body 71, the second cylinder is sealed with hydraulic oil 762, a second sliding column 721 slidably connected in the second cylinder is disposed inside the second inner friction plate 73, a first end of the second piston 761 is slidably connected in the second cylinder, and a second end of the second piston 761 protrudes out of the second caliper body 71.
The second electric cam mechanism 77 includes a second motor 771 and a second cam 772, an output shaft of the second motor 771 is connected to a base circle center of the second cam 772, and the second motor 771 can rotate the second cam 772 so that the second cam 772 pushes a second end of the second piston 761.
The second electric cam mechanism 77 can automatically control the lift of the second cam 772 and the clamping force of the second outer pad 72 and the second inner pad 73 on the second brake disk 10 according to the depth of the brake pedal, thereby generating different braking forces. The whole mechanism is simple and reliable in structure and small in occupied space. During the deceleration braking process, on one hand, when the brake pedal is stepped on, the motor of the electric cam mechanism (the first electric cam mechanism 47 and/or the second electric cam mechanism 77) rotates to drive the respective cam to rotate, so as to push the respective inner and outer friction plates to move, so as to clamp the respective brake disc, and generate braking force. The magnitude of the braking force is calculated according to the slip ratio of each wheel by the ABS, so that the stroke of the cam is controlled, and different optimal braking forces with proper magnitudes can be applied to the brake disc corresponding to each wheel. On the other hand, the first driving motor and the second driving motor can also generate a driving motor reverse braking force with a proper magnitude according to a whole vehicle braking feedback power generation strategy, so that the whole vehicle finishes speed reduction and parking braking running. The electric brake cam is used as the power of the brake, a whole set of air supply and storage devices such as an air compressor and the like are eliminated, the cost is greatly reduced, the arrangement space is increased, the number of parts is simplified, and the reliability and durability of the parts of the whole vehicle are improved.
In one embodiment, the first reduction mechanism 3 and the second reduction mechanism 6 are two-stage planetary gear reduction mechanisms.
The first reduction gear mechanism 3 includes a first primary planetary gear reduction mechanism 31 and a first secondary planetary gear reduction mechanism 32, the sun gear of the first primary planetary gear reduction mechanism 31 is connected to the outer end of the output shaft of the first driving motor 2, the sun gear of the first primary planetary gear reduction mechanism 31 is connected to the planet carrier of the first secondary planetary gear reduction mechanism 32, and the planet carrier of the first secondary planetary gear reduction mechanism 32 is connected to the outer wheel 11.
The second speed reduction mechanism 6 includes a second primary planetary gear speed reduction mechanism 61 and a second secondary planetary gear speed reduction mechanism 62, the sun gear of the second primary planetary gear speed reduction mechanism 61 is connected to the inner end of the output shaft of the second driving motor 5, the carrier of the second primary planetary gear speed reduction mechanism 61 is connected to the sun gear of the second secondary planetary gear speed reduction mechanism 62, and the carrier of the second secondary planetary gear speed reduction mechanism 62 is connected to the inner wheel 14.
According to the braking system provided by the embodiment of the invention, the outer wheel is driven by the first driving motor and the first planetary reduction mechanism, the inner wheel is driven by the second driving motor and the second planetary reduction mechanism, and the outer wheel and the inner wheel are respectively braked by the first brake and the second brake, so that each wheel of the two wheels on the same side is independently braked. Therefore, the braking force can be independently distributed to the four wheels on the left side and the right side (the left side and the right side are both double wheels), and the braking stability of the whole vehicle and the uniform abrasion of the tires of the single wheels are greatly improved.
In other embodiments, the clutch device may also be a clutch or a brake.
In addition, an embodiment of the present invention further provides a dual-wheel steer axle, which includes an inner wheel 14, an outer wheel 11 and the brake system of the above embodiment. The inner side wheels 14 are arranged on the inner side of the outer side wheels 11 side by side, the upper end of the driving motor installation steering seat 1 penetrates through a gap between the inner side wheels 14 and the outer side wheels 11, the output end of the first speed reducing mechanism 3 is connected with the rim of the outer side wheels 11, and the output end of the second speed reducing mechanism 6 is connected with the rim of the inner side wheels 14.
The second driving motor 5 and the first driving motor 2 are symmetrically arranged on the inner side and the outer side of the driving motor installation steering seat 1, and the following advantages are achieved:
(1) When the double wheels are in dynamic state, the vibration generated when the two motors are combined is eliminated.
(2) When the double wheels are in a dynamic state, the rotational inertia of the two motors is the same, and vibration is reduced.
(3) When the dual wheels are in a static state, the wheel loads of the outer wheel 11 and the inner wheel 12 are the same, so that the wear of the outer wheel 11 and the inner wheel 12 is uniform.
(4) When the double wheels steer, the self torque of the two motors is prevented from influencing steering.
In addition, the embodiment of the invention also provides an automobile which comprises the braking system or the double-wheel steering drive axle of the embodiment.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (12)

1. A braking system is characterized by comprising a driving motor mounting steering seat, a first driving motor, a first brake, a second driving motor and a second brake, wherein the first brake, the first driving motor, the second driving motor and the second brake are arranged in an inner space formed by enclosing inner wheels and outer wheels which are arranged inside and outside in parallel, the first driving motor is mounted on the outer side of the lower end of the driving motor mounting steering seat, and the second driving motor is mounted on the inner side of the lower end of the driving motor mounting steering seat;
the first brake is used for braking the outer wheel, and the second brake is used for braking the inner wheel.
2. The brake system according to claim 1, wherein the lower end of the driving motor mounting steering seat is provided with a through hole extending inwards and outwards, the outer end of the through hole is provided with a first mounting seat, the inner end of the through hole is provided with a second mounting seat, the shell of the first driving motor is fixed on the first mounting seat, and the shell of the second driving motor is fixed on the second mounting seat.
3. The braking system of claim 1, further comprising a clutch device connected between the first and second drive motors for controlling engagement and disengagement of the output shaft of the first drive motor with the output shaft of the second drive motor.
4. The braking system according to claim 3, further comprising a first speed reduction mechanism and a second speed reduction mechanism, wherein two ends of the first driving motor respectively penetrate through the shell of the first driving motor, the outer end of the output shaft of the first driving motor is connected with the input end of the first speed reduction mechanism, and the output end of the first speed reduction mechanism is connected with the outer wheel;
two ends of the second driving motor respectively penetrate out of the shell of the second driving motor, the inner end of an output shaft of the second driving motor is connected with the input end of the second speed reducing mechanism, and the output end of the second speed reducing mechanism is connected with the inner side wheel;
the clutch device is connected between the inner end of the output shaft of the first driving motor and the outer end of the output shaft of the second driving motor, and the first brake, the first speed reducing mechanism, the first driving motor, the clutch device, the second driving motor, the second speed reducing mechanism and the second brake are sequentially arranged from outside to inside.
5. The brake system according to claim 4, wherein the clutch device is a synchronizer, the synchronizer comprises an electric shifting fork, a coupling sleeve, a meshing sleeve and a coupling tooth, the electric shifting fork is fixed in the through hole of the driving motor mounting steering base, the coupling tooth is fixed at the inner end of the output shaft of the first driving motor, the coupling sleeve is provided with an inner spline hole, the coupling tooth is provided with a first outer spline which is in spline fit with the inner spline hole, the meshing sleeve is fixed at the outer end of the output shaft of the second driving motor, the meshing sleeve is provided with a second outer spline, and the coupling sleeve is normally meshed with the second outer spline through the inner spline hole so as to synchronously rotate along with the output shaft of the second driving motor;
the electronic shift fork is stirred outwards during the combination cover, the combination cover with combine the tooth spline connection, so that the output shaft of first driving motor and the combination of second driving motor's output shaft, electronic shift fork is inwards stirred during the combination cover, the combination cover with the combination tooth breaks away from, so that first driving motor's output shaft and the separation of second driving motor's output shaft.
6. The braking system of claim 1, wherein the first brake includes a first brake caliper and a first brake disc secured to the outboard wheel;
the first brake caliper comprises a first caliper body, a first outer side friction plate, a first inner side friction plate, a first caliper body support, a first guide pin shaft, a first thrust mechanism and a first electric cam mechanism, wherein the first outer side friction plate is fixed on an outer side cavity wall of an inner cavity of the first caliper body, which is opposite to the outer side surface of a first brake disc, the first inner side friction plate is positioned between an inner side surface of the first brake disc and an inner side cavity wall of the inner cavity of the first caliper body, which is opposite to the first brake disc, the first brake disc is positioned between the first outer side friction plate and the first inner side friction plate, the first caliper body support is fixed on a vehicle body, the first caliper body is slidably connected to the first caliper body support through the first guide pin shaft, the first thrust mechanism is arranged on the first caliper body, the outer end of the first thrust mechanism is connected to the first inner side friction plate, and the inner end of the first thrust mechanism protrudes out of the first caliper body; the first electric cam mechanism is used for pushing the inner end of the first thrust mechanism, so that the first thrust mechanism pushes the first inner side friction plate to move outwards and press and hold the first inner side friction plate on the inner side surface of the first brake disc, and the first electric cam mechanism continues to apply acting force, so that the first thrust mechanism generates reverse acting force to drive the first caliper body to move inwards until the first outer side friction plate presses on the outer side surface of the first brake disc.
7. The brake system according to claim 6, wherein the first thrust mechanism comprises a first cylinder and a first piston, the first cylinder is arranged in the first caliper body, the first cylinder encloses hydraulic oil, the inner side of the first inner friction plate is provided with a first sliding column which is slidably connected in the first cylinder, a first end of the first piston is slidably connected in the first cylinder, and a second end of the first piston protrudes out of the first caliper body;
the first electric cam mechanism comprises a first motor and a first cam, an output shaft of the first motor is connected to the center of a base circle of the first cam, and the first motor can drive the first cam to rotate when rotating, so that the first cam pushes the second end of the first piston.
8. A braking system according to claim 1 or 6, wherein the second brake comprises a second brake caliper and a second brake disc fixed to the inboard wheel;
the second brake caliper comprises a second caliper body, a second outer side friction plate, a second inner side friction plate, a second caliper body support, a second guide pin shaft, a second thrust mechanism and a second electric cam mechanism, wherein the second inner side friction plate is fixed on an outer side cavity wall of an inner cavity of the second caliper body, which is opposite to the inner side surface of a second brake disc, the second outer side friction plate is positioned between the inner side surface and the outer side cavity wall of the inner cavity of the second caliper body, which is opposite to the second brake disc, the second brake disc is positioned between the second outer side friction plate and the second inner side friction plate, the second caliper body support is fixed on a vehicle body, the second caliper body is slidably connected to the second caliper body support through the second guide pin shaft, the second thrust mechanism is arranged on the second caliper body, the outer end of the second thrust mechanism is connected to the second outer side friction plate, and the outer end of the second thrust mechanism protrudes out of the second friction plate; the second electric cam mechanism is used for pushing the outer end of the second thrust mechanism, so that the second thrust mechanism pushes the second outer side friction plate to move inwards and press and hold the outer side friction plate on the outer side surface of the second brake disc, and the second electric cam mechanism continues to apply acting force, so that the second thrust mechanism generates reverse acting force to drive the second caliper body to move outwards until the second inner side friction plate presses on the inner side surface of the second brake disc.
9. The brake system according to claim 8, wherein the second thrust mechanism comprises a second cylinder and a second piston, the second cylinder is disposed in the second caliper body, the second cylinder encloses hydraulic oil, the inner side of the second inner friction plate is provided with a second sliding column slidably connected in the second cylinder, a first end of the second piston is slidably connected in the second cylinder, and a second end of the second piston protrudes out of the second caliper body;
the second electric cam mechanism comprises a second motor and a second cam, an output shaft of the second motor is connected to the center of a base circle of the second cam, and the second motor can drive the second cam to rotate when rotating, so that the second cam pushes a second end of the second piston.
10. The brake system according to claim 1, wherein the first reduction mechanism and the second reduction mechanism are two-stage planetary gear reduction mechanisms;
the first speed reducing mechanism comprises a first primary planetary gear speed reducing mechanism and a first secondary planetary gear speed reducing mechanism, a sun gear of the first primary planetary gear speed reducing mechanism is connected with the outer end of an output shaft of the first driving motor, a planet carrier of the first primary planetary gear speed reducing mechanism is connected with the sun gear of the first secondary planetary gear speed reducing mechanism, and the planet carrier of the first secondary planetary gear speed reducing mechanism is connected with an outer wheel;
the second speed reducing mechanism comprises a second primary planetary gear speed reducing mechanism and a second secondary planetary gear speed reducing mechanism, a sun gear of the second primary planetary gear speed reducing mechanism is connected with the inner end of an output shaft of the second driving motor, a planet carrier of the second primary planetary gear speed reducing mechanism is connected with a sun gear of the second secondary planetary gear speed reducing mechanism, and the planet carrier of the second secondary planetary gear speed reducing mechanism is connected with inner side wheels.
11. A double-wheel steering drive axle, which comprises an inner wheel, an outer wheel and the braking system as claimed in any one of claims 1 to 10, wherein the inner wheel is arranged on the inner side of the outer wheel side by side, the upper end of the driving motor mounting steering seat penetrates through a gap between the inner wheel and the outer wheel, the output end of the first speed reducing mechanism is connected with the rim of the outer wheel, and the output end of the second speed reducing mechanism is connected with the rim of the inner wheel.
12. A motor vehicle comprising a brake system according to any one of claims 1 to 10 or a two-wheel steer axle according to claim 11.
CN202110602061.5A 2021-05-31 2021-05-31 Braking system, double-wheel steering drive axle and automobile Pending CN115476829A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110602061.5A CN115476829A (en) 2021-05-31 2021-05-31 Braking system, double-wheel steering drive axle and automobile

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110602061.5A CN115476829A (en) 2021-05-31 2021-05-31 Braking system, double-wheel steering drive axle and automobile

Publications (1)

Publication Number Publication Date
CN115476829A true CN115476829A (en) 2022-12-16

Family

ID=84419736

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110602061.5A Pending CN115476829A (en) 2021-05-31 2021-05-31 Braking system, double-wheel steering drive axle and automobile

Country Status (1)

Country Link
CN (1) CN115476829A (en)

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