CN115289151A - Worm-gear type electronic parking power assembly for drum brake - Google Patents

Worm-gear type electronic parking power assembly for drum brake Download PDF

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Publication number
CN115289151A
CN115289151A CN202210798576.1A CN202210798576A CN115289151A CN 115289151 A CN115289151 A CN 115289151A CN 202210798576 A CN202210798576 A CN 202210798576A CN 115289151 A CN115289151 A CN 115289151A
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CN
China
Prior art keywords
worm
gear
shell
upper cover
screw rod
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
CN202210798576.1A
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Chinese (zh)
Inventor
姚兴娟
蔡伟
李梦科
杨亿
施英杰
田丽红
张水清
李学佳
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhejiang Asia Pacific Mechanical and Electronic Co Ltd
Original Assignee
Zhejiang Asia Pacific Mechanical and Electronic 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 Zhejiang Asia Pacific Mechanical and Electronic Co Ltd filed Critical Zhejiang Asia Pacific Mechanical and Electronic Co Ltd
Priority to CN202210798576.1A priority Critical patent/CN115289151A/en
Publication of CN115289151A publication Critical patent/CN115289151A/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00—Parts or details
    • F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2121/00—Type of actuator operation force
    • F16D2121/18—Electric or magnetic
    • F16D2121/24—Electric or magnetic using motors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2125/00—Components of actuators
    • F16D2125/18—Mechanical mechanisms
    • F16D2125/20—Mechanical mechanisms converting rotation to linear movement or vice versa
    • F16D2125/34—Mechanical mechanisms converting rotation to linear movement or vice versa acting in the direction of the axis of rotation
    • F16D2125/42—Rack-and-worm gears

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • General Engineering & Computer Science (AREA)
  • Gear Transmission (AREA)

Abstract

The invention discloses a worm and gear type electronic parking power assembly for a drum brake. The shell and the upper cover are connected to form a cavity in which a motor, a tooth worm and gear transmission mechanism and a thread transmission mechanism are arranged; in the worm gear and worm transmission mechanism, an output shaft of a motor is coaxially and fixedly connected with a worm, and the worm is meshed with a worm gear to form a worm gear pair; in the thread transmission mechanism, a connecting thread sleeve and a worm wheel are coaxially and fixedly sleeved, an output shaft of a motor is perpendicular to a screw rod, the middle of the screw rod is sleeved in a thread through hole of the connecting thread sleeve through threads, one end of the screw rod is limited and installed in an upper cover in a non-rotatable mode, and the other end of the screw rod penetrates out of the connecting thread sleeve and a shell and is connected with a brake pull arm. The electronic parking power assembly is more stable in transmission, the transmission direction is changed through worm and gear transmission, the occupied space of the electronic parking power device is reduced, the electronic parking power assembly is convenient to install, efficient, stable and quick in response, and the problems that the electronic parking power assembly is large in size and complex in structure and the like are solved.

Description

Worm-gear type electronic parking power assembly for drum brake
Technical Field
The invention belongs to an electronic parking structure of an automobile brake-by-wire technology, and particularly relates to a worm and gear type electronic parking power assembly for a drum brake.
Background
Compared with a traditional mechanical hand brake, the electronic parking can prevent accidental release, avoid the condition that the parking forgets to pull the hand brake and the starting forgets to loosen the hand brake, can be combined with other electric systems to form an intelligent system, realizes intelligent control, realizes functions such as rolling and re-clamping, high-temperature re-clamping and the like, and is safer and more reliable. The electronic parking can integrate the functions of temporary braking during driving and long-term braking after parking, and realizes parking braking in an electronic control mode. The conventional electronic parking brake system is powered by a motor and acts on a brake through a speed reducer to realize the braking performance.
At present, an electronic parking power assembly on the market basically adopts a gear transmission mode, the transmission is small, multi-stage gear transmission is needed, and the electronic parking power assembly has the defects of high cost, large occupied space, complex process and the like on the requirements of manufacturing and installation precision.
Disclosure of Invention
The invention aims to overcome the defects and shortcomings in the prior art, provides the worm and gear type electronic parking power assembly for the drum brake, has high-efficiency and accurate braking effect, provides a better choice for parking various vehicle types, and promotes the continuous progress of the drum brake technology.
The technical scheme of the invention is as follows:
the invention comprises an external shell, a motor, a tooth worm gear transmission mechanism and a thread transmission mechanism, wherein the external shell comprises a shell assembly and an upper cover; the worm and gear transmission mechanism comprises a worm and a worm gear, an output shaft of the motor is coaxially and fixedly connected with the worm, and the worm gear are meshed to form a worm and gear pair; the screw thread drive mechanism include connecting thread cover and screw rod, the output shaft of motor with the screw rod is arranged perpendicularly, connecting thread cover and the coaxial fixed cup joint of worm wheel, the screw rod middle part is through the screw thread suit form the screw thread pair in the screw thread through-hole of connecting thread cover, screw rod one end by unable rotatory ground spacing installation in the upper cover, the other end is worn out and is arranged in connecting thread cover, casing, the screw rod other end is worn out behind the casing and is connected with outside braking single arm-drag.
The screw comprises a screw part and a limiting flower-shaped end, the screw part is sleeved in a threaded through hole of the connecting threaded sleeve through threads, and the limiting flower-shaped end is inserted into the limiting flower-shaped end of the upper cover arranged on the upper cover.
The outer peripheral surface of one end of the connecting threaded sleeve which is not sleeved with the worm wheel is in supporting connection with the shell through an angular contact bearing, and the outer peripheral surface of the other end of the connecting threaded sleeve is connected with the shell and the upper cover through a bearing disc spring assembly.
The bearing disc spring assembly comprises a needle roller thrust bearing, a disc spring and a disc spring sleeve, the needle roller thrust bearing and the disc spring are sequentially sleeved between the end face of the connecting thread sleeve and the upper cover, the disc spring is installed in the disc spring sleeve, and the disc spring sleeve is connected to the inner end face of the upper cover.
The shell assembly is also provided with a socket used for being electrically connected with the motor.
The invention comprises a drum brake and a sub-parking brake power device connected with the electronic parking brake power device and connected through a bracket. In the electronic parking power assembly, the speed reducing mechanism adopts worm and gear transmission, and the motor drives the screw rod to move back and forth along the axial direction through the worm and gear transmission. The utility model provides a turbine worm formula electron parking power assembly for on drum brake has solved traditional manual pull rod formula structure, adopts the motor to pass through turbine worm drive screw rod round trip movement, and is relatively artifical, and mechanical transmission's precision is higher, has solved the big problem of relative gear drive noise simultaneously, and braking effect is better and driving comfort is higher.
Meanwhile, due to the addition of the elastic element disc spring, the situation that locking is caused due to the fact that the connecting thread sleeve is matched with the screw rod to move and abut against the screw rod can be effectively avoided, and the whole worm gear transmission and the thread transmission are more smooth and lubricated. The turbine is fixed on the connecting threaded sleeve and drives the threaded screw to transmit. The turbine and the connecting threaded sleeve are connected in a fixed mode of injection molding, and compared with other connecting modes, the connecting threaded sleeve is more convenient and lower in cost. The electronic control unit ECU can judge whether the whole electronic parking power assembly completely finishes the releasing action or not by changing the load of the motor according to the elastic change degree of the elastic element so as to change the change condition of the current, can replace a sensor, reduces parts, reduces the cost and has higher reliability.
The gear teeth of the worm are continuous, so that the transmission is stable, the meshing impact is small, the braking process is stable, the phenomena of braking jitter, abnormal sound and the like are avoided, and the worm gear is high in practicability. And the number of teeth (number of heads) of the worm is small, a large transmission ratio can be obtained by single-stage transmission, and the structure is compact.
The electronic parking power assembly in the whole control system device is fixed on the drum brake through the mounting bracket. Meanwhile, the electronic parking power assembly is in butt joint with an external electronic control unit ECU through a connector at the socket. And the ECU performs instruction feedback after processing the data received by the sensors, and sends out a control instruction according to road conditions and vehicle conditions to realize the electrification and the disconnection of the electronic parking power assembly and realize the pull-up or the release of the drum brake.
By adopting the technical scheme of the invention, the stability of the piston in reciprocating motion is improved, and the service life is prolonged.
The invention has the beneficial effects that:
according to the electronic parking power device, the torque of the electronic parking power device is increased through the worm gear and worm transmission, the transmission is more stable, meanwhile, the transmission direction is changed through the worm gear and worm transmission, and the occupied space of the electronic parking power device is reduced.
The electronic parking power assembly is simple in structure, convenient to install, efficient, stable and quick in response, and solves the problems that the electronic parking power assembly is large in size and complex in structure and the like.
In the electronic parking brake assembly adopted by the invention, the worm wheel adopts multiple heads through a worm wheel and worm transmission mode and a thread transmission mode, the reduction ratio of the gear reduction mechanism is increased, the size of a specific part is reduced, the transmission precision of the gear reduction mechanism is improved, meanwhile, the installation space required by the whole power device is reduced, meanwhile, the worm wheel and worm transmission has smooth transmission without clamping stagnation, and the noise is low, so that the braking effect during parking brake is favorably improved.
Drawings
FIG. 1 is a general configuration diagram of a worm and gear electric parking power assembly of the present invention;
FIG. 2 is an exploded view of the worm and worm gear electronic parking powertrain of the present invention;
FIG. 3 is an assembly diagram of a motor, a gear transmission mechanism and a screw transmission mechanism in the worm and gear type electronic parking power assembly device according to the present invention;
fig. 4 is an exploded view of the motor, the gear transmission mechanism and the screw transmission mechanism in the worm and gear type electronic parking power assembly device of the invention.
In the figure: 1, a shell assembly; 1.1 a shell; 1.1.1 a socket; 1.2 inserting a pin; 2, covering the cover; 2.1, covering a position-limiting flower-shaped end; 3, a motor; 4, a worm; 5, an output worm gear assembly; 5.1 worm wheel; 5.2 connecting the thread bush; 6, a screw rod; 6.1 a threaded portion; 6.2 limiting the pattern end; 7 angular contact bearings; 8, a needle roller thrust bearing; 9, a disc spring; 10 disc spring sleeves; 11 dust cover.
Detailed Description
The invention further discloses a worm and gear type electronic parking power assembly, which is combined with the attached drawings of the specification.
As shown in fig. 1 and 2, the external shell comprises an external shell, a motor 3, a toothed worm gear transmission mechanism and a thread transmission mechanism, wherein the external shell comprises a shell assembly 1 and an upper cover 2, the shell assembly 1 comprises a shell 1.1, and the shell 1.1 and the upper cover 2 are connected to form a cavity for mounting the motor 3, the toothed worm gear transmission mechanism and the thread transmission mechanism; the outer housing is provided with a dust cover 11.
The motor 3 is welded and fixed on the shell 1.1;
as shown in fig. 2 and fig. 3, the worm gear and worm transmission mechanism includes a worm 4 as a driving mechanism and a worm wheel 5.1 as a driven mechanism, an output shaft of the motor 3 is coaxially and fixedly connected with the worm 4, the worm 4 and the output shaft of the motor 3 are fixed on the output shaft of the motor 3 through interference fit, and the worm 4 and the worm wheel 5.1 are meshed to form a worm-gear pair; the worm gear and worm drive changes the drive direction, which is beneficial to the stability of torque transmission and can effectively reduce the working noise.
At present, an electronic parking power assembly on the market basically adopts a gear transmission mode, the transmission is small, multi-stage gear transmission is needed, and the defects of high cost, large occupied space and the like on the requirements of manufacturing and mounting precision are overcome. Because the number of teeth (number of heads) of the worm is small, a larger transmission ratio can be obtained by single-stage transmission, and the structure is compact, so that the layout is more reasonable, and the occupied space of the electronic parking power device is reduced.
The worm and gear transmission mode adopted by the invention can change the transmission direction, is continuous, has the advantages of stable operation, small generated impact, small vibration, small noise, long service life and the like compared with straight gear transmission, has a small meshing impact and a stable braking process, does not have the phenomena of braking shake, abnormal sound and the like, and has strong practicability.
As shown in fig. 2 and fig. 3, the screw transmission mechanism includes a connecting screw sleeve 5.2 and a screw rod 6, the connecting screw sleeve 5.2 and a worm wheel 5.1 are coaxially and fixedly sleeved, and the worm wheel 5.1 and the connecting screw sleeve 5.2 are connected and fixed in an injection molding manner. The turbine is made of plastic materials, weight can be reduced, and noise can be reduced by utilizing the self-lubricating property of the plastic. Screw rod 6 middle part is through the screw thread suit form the screw thread pair in the screw thread through-hole of connecting thread cover 5.2, drives 6 axial motion of screw rod through connecting thread cover 5.2, and connecting thread cover 5.2, worm wheel 5.1 and the coaxial arrangement of screw rod 6, and the screw thread transmission between connecting thread cover 5.2 and the screw rod 6 has self-locking function for the phenomenon of skidding can not appear in arbitrary parking stroke stop, and is more reliable safety. The position of the motor 3 is fixed on the shell, and meanwhile, the angular contact bearing 7 is positioned on the shell, so that the transmission mechanism is positioned and transmission is ensured.
One end of the screw rod 6 is limited and mounted in the upper cover 2 in a non-rotatable mode, the screw rod 6 can only move axially, the other end of the screw rod 6 penetrates through the connecting threaded sleeve 5.2 and the shell 1.1 to be arranged, and the other end of the screw rod 6 penetrates through the shell 1.1 and then is connected with an external brake pull arm. In specific implementation, the other end of the screw 6 penetrates through the shell 1.1 and then is connected with an external brake pull arm through the dust cover 11 in a protection mode.
One end of the dust cover 11 is matched with the shell assembly 1, and the other end of the dust cover is matched with a pull wire connected with the screw rod and can axially move along with the screw rod, so that external dust and the like are prevented from entering the electronic parking power assembly to influence mechanism transmission.
The screw 6 comprises a screw part 6.1 and a limiting flower-shaped end 6.2, the screw part 6.1 is sleeved in a threaded through hole of the connecting threaded sleeve 5.2 through threads, and the connecting threaded sleeve 5.2 and the screw 6 are in threaded transmission with the self-locking function. The limit flower-shaped end 6.2 is inserted into the upper cover limit flower-shaped end 2.1 arranged on the upper cover 2, so that the screw rod 6 can not rotate and can only axially move. The limiting flower-shaped end 6.2 arranged on the screw rod 6 is matched with the limiting flower-shaped end 2.1 arranged on the upper cover 2, so that the radial rotation of the screw rod 6 is limited, and only axial linear movement is allowed.
As shown in fig. 2, the outer peripheral surface of one end of a connection screw sleeve 5.2, which is not fitted with a worm wheel 5.1, is supported and connected to a housing 1.1 via an angular contact bearing 7, and the outer peripheral surface of the other end is connected to the housing 1.1 and an upper cover 2 via a bearing disc spring assembly. The inner ring of the angular contact bearing 7 is matched with the connecting thread bush 5.2, and the outer ring is matched with the shell. Therefore, the connection threaded sleeve 5.2 is supported in the housing in a limited manner by the action of the angular contact bearing 7, ensuring that axial rotation is still possible.
The bearing disc spring assembly comprises a needle roller thrust bearing 8, a disc spring 9 and a disc spring sleeve 10, the needle roller thrust bearing 8 and the disc spring 9 are sequentially sleeved between the end face of the connecting threaded sleeve 5.2 and the upper cover 2, the disc spring 9 is installed in the disc spring sleeve 10, and the disc spring sleeve 10 is connected to the inner end face of the upper cover 2.
The disc spring 9 is deformed to absorb vibration and impact in the braking process, parts such as the needle thrust bearing 9 are protected, energy can be stored, and meanwhile, the disc spring 9 resets to release energy in the braking releasing process to assist in braking releasing. Four disc springs 9 are arranged in the disc spring sleeve 10, and the function of the four disc springs 9 can be strengthened by using the disc springs.
The shell assembly 1 is also provided with a socket 1.1.1 which is used for being electrically connected with the motor 3, and the socket 1.1.1 is used for being connected with an electronic control unit ECU, controlling an electronic parking power device and controlling the electronic parking power assembly to clamp or release at proper time. The pins 1.2 of the plug sockets 1.1.1 are plugged to the external electrical interfaces and are injection molded into the housing. The other end of the contact pin 1.2 is connected with the motor through welding.
The motor 3 operates to drive the worm 4 to rotate, the worm 4 drives the connecting threaded sleeve 5.2 to synchronously rotate through the worm gear pair, the screw connection between the connecting threaded sleeve 5.2 and the screw 6 is realized, the screw 6 is limited to rotate by the upper cover limiting flower-shaped end 6.2, the screw 6 is finally driven to axially move, and then the brake pull arm is pulled up or released to stretch the brake shoe and tightly press the brake drum to realize parking or releasing.
In the whole transmission mechanism, when the ECU controls the motor 3 to be electrified through the connector port 1.1.1 on the shell assembly to drive the worm wheel 5.1 to rotate, the worm 6 drives the worm wheel meshed with the worm wheel to rotate, the worm wheel is fixed on the connecting thread sleeve, the connecting thread sleeve moves with the screw thread to drive the screw to move forwards or backwards, the screw 6 is connected with one end of the stay wire in a riveting mode, the brake stay wire of the brake drum is pulled up or released, and parking or parking releasing is achieved. One end of the dust cover 11 is buckled on the shell assembly 1, the other end of the dust cover is clamped at the position of the screw stay wire, and in the process of pulling up and releasing movement, the screw thread transmission and the worm and gear transmission are protected, and dust and the like are prevented from entering.
When the motor 3 is electrified to rotate forwards, the worm 4 drives the output worm gear assembly 5, the internal thread of the connecting threaded sleeve 5.2 rotates along with the output worm gear assembly and drives the screw rod 6 in threaded transmission with the internal thread to axially pull, and the internal thread acts on the pull arm of the brake drum to realize parking or releasing;
when the motor 3 is electrified and reversely rotated, the worm 4 drives the worm to output the worm gear assembly 5, the internal thread of the connecting thread sleeve 5.2 also rotates along with the rotation and drives the screw rod 6 in thread transmission with the screw rod to be pulled up in the axial direction in the reverse direction, and the internal thread acts on the pull arm of the brake drum to release parking.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (5)

1. The utility model provides a worm gear formula electron parking power assembly for drum brake which characterized in that: the motor-driven gear box comprises an external shell, a motor (3), a toothed worm gear transmission mechanism and a thread transmission mechanism, wherein the external shell comprises a shell assembly (1) and an upper cover (2), the shell assembly (1) comprises a shell (1.1), and the shell (1.1) and the upper cover (2) are connected to form a cavity for mounting the motor (3), the toothed worm gear transmission mechanism and the thread transmission mechanism; the worm and gear transmission mechanism comprises a worm (4) and a worm wheel (5.1), an output shaft of the motor (3) is coaxially and fixedly connected with the worm (4), and the worm (4) and the worm wheel (5.1) are meshed to form a worm and gear pair; screw thread drive mechanism include connecting thread bush (5.2) and screw rod (6), the output shaft of motor (3) with arrange perpendicularly with screw rod (6), connecting thread bush (5.2) and worm wheel (5.1) coaxial fixed cup joint, screw rod (6) middle part is through the screw thread suit formation screw thread pair in the screw thread through-hole of connecting thread bush (5.2), screw rod (6) one end is by spacing the installation in upper cover (2) in unable rotation ground, the other end is worn out and is connected thread bush (5.2), casing (1.1) are arranged, screw rod (6) other end is worn out behind casing (1.1) and outside braking arm-drag is connected.
2. The worm-and-gear electric parking power assembly for a drum brake as claimed in claim 1, characterized in that: the screw (6) comprises a screw part (6.1) and a limiting flower-shaped end (6.2), the screw part (6.1) is sleeved in a threaded through hole of the connecting threaded sleeve (5.2) through threads, and the limiting flower-shaped end (6.2) is inserted into the limiting flower-shaped end (2.1) of the upper cover arranged on the upper cover (2).
3. The worm-and-gear electric parking power assembly for a drum brake as claimed in claim 1, characterized in that: the outer peripheral surface of one end of the connecting threaded sleeve (5.2) which is not sleeved with the worm wheel (5.1) is supported and connected with the shell (1.1) through an angular contact bearing (7), and the outer peripheral surface of the other end of the connecting threaded sleeve is connected with the shell (1.1) and the upper cover (2) through a bearing disc spring assembly.
4. The worm-and-gear electric parking power assembly for a drum brake as claimed in claim 3, characterized in that: the bearing disc spring assembly comprises a needle roller thrust bearing (8), a disc spring (9) and a disc spring sleeve (10), the needle roller thrust bearing (8) and the disc spring (9) are sequentially sleeved between the end face of the connecting thread sleeve (5.2) and the upper cover (2), the disc spring (9) is installed in the disc spring sleeve (10), and the disc spring sleeve (10) is connected to the inner end face of the upper cover (2).
5. The worm-and-gear electric parking power assembly for a drum brake as claimed in claim 1, characterized in that: the shell assembly (1) is also provided with a socket (1.1.1) used for being electrically connected with the motor (3).
CN202210798576.1A 2022-07-06 2022-07-06 Worm-gear type electronic parking power assembly for drum brake Pending CN115289151A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210798576.1A CN115289151A (en) 2022-07-06 2022-07-06 Worm-gear type electronic parking power assembly for drum brake

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210798576.1A CN115289151A (en) 2022-07-06 2022-07-06 Worm-gear type electronic parking power assembly for drum brake

Publications (1)

Publication Number Publication Date
CN115289151A true CN115289151A (en) 2022-11-04

Family

ID=83822546

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210798576.1A Pending CN115289151A (en) 2022-07-06 2022-07-06 Worm-gear type electronic parking power assembly for drum brake

Country Status (1)

Country Link
CN (1) CN115289151A (en)

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