CN112443629A - Multistage transmission mechanism - Google Patents
Multistage transmission mechanism Download PDFInfo
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- CN112443629A CN112443629A CN202011289458.5A CN202011289458A CN112443629A CN 112443629 A CN112443629 A CN 112443629A CN 202011289458 A CN202011289458 A CN 202011289458A CN 112443629 A CN112443629 A CN 112443629A
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- worm
- worm wheel
- piston
- screw rod
- transmission
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 62
- 230000007246 mechanism Effects 0.000 title claims abstract description 29
- 230000009467 reduction Effects 0.000 claims description 14
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 238000009434 installation Methods 0.000 abstract description 2
- 230000010354 integration Effects 0.000 abstract description 2
- 230000004044 response Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 208000032369 Primary transmission Diseases 0.000 description 1
- 208000032370 Secondary transmission Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000009347 mechanical transmission Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
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Classifications
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- 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
- F16H—GEARING
- F16H1/00—Toothed gearings for conveying rotary motion
- F16H1/02—Toothed gearings for conveying rotary motion without gears having orbital motion
- F16H1/04—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members
- F16H1/12—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members with non-parallel axes
- F16H1/16—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members with non-parallel axes comprising worm and worm-wheel
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- 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
- F16D51/00—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like
- F16D51/16—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as brake-shoes pivoted on a fixed or nearly-fixed axis
- F16D51/18—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as brake-shoes pivoted on a fixed or nearly-fixed axis with two brake-shoes
- F16D51/20—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as brake-shoes pivoted on a fixed or nearly-fixed axis with two brake-shoes extending in opposite directions from their pivots
- F16D51/22—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as brake-shoes pivoted on a fixed or nearly-fixed axis with two brake-shoes extending in opposite directions from their pivots mechanically actuated
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- 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
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- 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
- F16H—GEARING
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/02—Toothed members; Worms
- F16H55/08—Profiling
- F16H55/0846—Intersecting-shaft arrangement of the toothed members
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- 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
- F16H—GEARING
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/02—Toothed members; Worms
- F16H55/22—Toothed members; Worms for transmissions with crossing shafts, especially worms, worm-gears
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
- H02K7/116—Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears
- H02K7/1163—Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears where at least two gears have non-parallel axes without having orbital motion
- H02K7/1166—Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears where at least two gears have non-parallel axes without having orbital motion comprising worm and worm-wheel
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- 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
- F16D2121/02—Fluid pressure
- F16D2121/04—Fluid pressure acting on a piston-type actuator, e.g. for liquid pressure
-
- 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
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Gear Transmission (AREA)
Abstract
The invention discloses a multistage transmission mechanism which comprises a motor speed reducing mechanism for driving, a worm wheel and a screw rod, wherein the output shaft end of the motor speed reducing mechanism is in transmission connection with one end of the worm, the worm is obliquely arranged and meshed with the worm wheel, the screw rod is in threaded connection with the interior of the worm wheel, one end of a piston is fixedly connected with a rear brake shoe, and a salient point at the other end of the piston is in contact with the worm wheel. The invention has the advantages of ingenious conception, compact and reasonable structure, convenient and quick installation, integration of the worm gear, the worm and the screw bolt sleeve, quick response of motor drive transmission, small vibration and low noise.
Description
Technical Field
The invention relates to the technical field of transmission mechanisms, in particular to a multi-stage transmission mechanism.
Background
At present, two types of mechanical transmission are common in modern industry: worm and gear transmission and screw and thread sleeve transmission. The worm and gear is used for transmitting motion and power between two staggered shafts in space, the transmission is changed into another transmission in the vertical direction, and the worm and gear has the advantages of large transmission ratio, small volume, stable operation and low noise during transmission. The screw thread sleeve mainly converts rotary motion into linear motion or converts linear motion into rotary motion, has simple structure, low manufacturing cost and self-locking function, but has large friction resistance moment and low transmission efficiency (30-40%). In popular terms, the worm gear and the worm are in staggered shafting transmission and can only transmit; the screw thread sleeve belongs to parallel shafting transmission, and can transmit and also can be fastened.
In order to solve the problems, the invention provides a novel transmission mechanism with a worm gear and a worm integrated with a screw rod and a threaded sleeve, which is used for solving the defects and meeting the requirements of transmission and self-locking of staggered and parallel double-axis systems.
Disclosure of Invention
The invention aims to provide a multi-stage transmission mechanism to meet the requirements of transmission and self-locking of staggered and parallel double-shaft systems.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention relates to a multistage transmission mechanism which comprises a motor speed reducing mechanism for driving, a worm wheel and a screw rod, wherein the output shaft end of the motor speed reducing mechanism is in transmission connection with one end of the worm, the worm is obliquely arranged and meshed with the worm wheel, the screw rod is in threaded connection with the interior of the worm wheel, one end of a piston is fixedly connected with a rear brake shoe, and a salient point at the other end of the piston is in contact with the worm wheel.
Further, motor reduction gears's output shaft end with the tail end of worm alternates the cooperation and is connected, the head number of worm sets up to, the number of teeth of worm wheel sets up to 22, the worm wheel with the transmission screw thread outer wall of worm is 20 pressure angle and meshes mutually, the pitch of screw rod sets up to 2mm, and the tooth form angle of screw rod sets up 30, the fluting one end of piston with the horseshoe contact and the interlock of back brake shoe are motionless, the steel ball convex surface one end of piston with the concave surface one end contact of worm wheel just has relative roll trend.
Still further, the motor reduction mechanism specifically adopts two-stage planetary gear reduction, the transmission ratio of each stage is 4.5, the transmission ratio of the worm wheel and the worm is 11, the transmission ratio of the worm wheel and the screw is 11, and the total transmission ratio is 222.75.
Still further, the number of teeth of the worm wheel is designed to be 22, the modulus is set to be 0.65, the pressure angle is set to be 20 degrees, the thread pitch is designed to be 2, the number of heads of the worm is designed to be 2, the modulus is designed to be 0.65, and the thread pitch is set to be 2.041.
Furthermore, one end of the piston is provided with a U-shaped groove, and the U-shaped groove is in occlusion connection with a shoe of the rear brake shoe; one end of the piston is connected with a steel ball, and the steel ball protrudes out of the end face of the piston and is abutted against the concave face of the worm wheel; one end of the screw rod is in threaded connection with an inner hole of the worm wheel, and the other end of the screw rod is provided with a groove which is in contact with a shoe at the upper end of the front brake shoe and is connected with the shoe in a meshing manner.
Compared with the prior art, the invention has the beneficial technical effects that:
the invention relates to a multistage transmission mechanism, which comprises a motor reduction mechanism for driving, a worm wheel and a screw rod, wherein the output shaft end of the motor reduction mechanism is connected with one end of the worm to form primary transmission, the worm and the worm wheel are obliquely arranged and meshed to form secondary transmission, the interior of the worm wheel is connected with the screw rod through threads to form tertiary transmission, the screw rod and a piston drive transmission connection of parts on two sides to form four-stage transmission, the worm wheel is used as a screw sleeve, the piston at one end is independent, and the screw rod at one end is screwed in and screwed out; the multi-stage transmission mechanism can meet the requirements of staggered and parallel double-shaft system transmission; the transmission ratio of the transmission mechanism can be selectively adjusted along with use, the vibration is small, the noise is low, and the service life is long; the transmission mechanism integrates a worm gear and a worm rod with a screw rod and a threaded sleeve, and has the advantages of simple structure, cost saving, unique process, high reaction speed and low failure rate.
In general, the invention has the advantages of ingenious conception, compact and reasonable structure, convenient and rapid installation, integration of the worm gear and the worm screw and the screw sleeve, rapid response of motor drive transmission, small vibration and low noise.
Drawings
The invention is further illustrated in the following description with reference to the drawings.
FIG. 1 is a front view of the multi-stage transmission of the present invention;
FIG. 2 is a top plan view of the multi-stage transmission of the present invention;
FIG. 3 is a schematic view of the present invention in use;
description of reference numerals: 1. a worm; 2. a piston; 3. a turbine; 4. a screw; 5. a front brake shoe; 6. a rear brake shoe; 7. and adjusting the ratchet wheel.
Detailed Description
As shown in fig. 1 to 3, the multistage transmission mechanism comprises a motor reduction mechanism for driving, a worm 1, a worm wheel 3 and a screw rod 4, wherein an output shaft end of the motor reduction mechanism is in transmission connection with one end of the worm 1, the worm 1 and the worm wheel 3 are obliquely arranged and meshed with each other, the screw rod 4 is in threaded connection with the inside of the worm wheel 3, one end of a piston 2 is fixedly connected with a rear brake shoe 3, and a salient point at the other end of the piston 2 is in contact with the worm wheel 3.
Specifically, motor reduction gears's output shaft end with the tail end of worm 1 alternates the cooperation and is connected, the head number of worm 1 sets up to 2, the number of teeth of worm wheel 3 sets up to 22, worm wheel 3 with the transmission screw outer wall of worm 1 is 20 pressure angle and meshes mutually, the pitch of screw rod 4 sets up to 2mm, and the tooth form angle of screw rod 4 sets up 30, the fluting one end of piston 2 with the horseshoe contact and the interlock of back brake shoe 3 are motionless, the steel ball convex surface one end of piston 2 with the concave surface one end contact of worm wheel 3 just has the relative roll trend.
The motor speed reducing mechanism specifically adopts a two-stage planetary gear for speed reduction, the transmission ratio of each stage is 4.5, the transmission ratio of the worm wheel 3 to the worm 1 is 11, the transmission ratio of the worm wheel 3 to the screw rod 4 is 11, and the total transmission ratio is 222.75.
The number of teeth of the worm wheel 3 is designed to be 22, the modulus is set to be 0.65, the pressure angle is set to be 20 degrees, the thread pitch is designed to be 2, the number of heads of the worm 1 is designed to be 2, the modulus is designed to be 0.65, and the thread pitch is set to be 2.041.
Specifically, in one embodiment, the number of teeth of the worm wheel 3 is designed to be Z222, the modulus is set to 0.65,the lead angle is set to be 20 degrees, the thread pitch is set to be 2 degrees, the diameter of a reference circle is 14.3mm, the base circle is 13.43mm, the deflection coefficient is 0.6, the crest height coefficient is 1, the crest clearance coefficient is 0.25, and the tooth form angle is 30 degrees.
The number of the heads of the worm 1 is designed to be Z1The modulus is designed to be 0.65, the pitch is set to 2.041, and the lead is 4.082.
According to the actual required transmission ratio, the relevant parameters can be properly adjusted.
One end of the piston 2 is provided with a U-shaped groove, and the U-shaped groove is meshed and connected with a shoe of the rear brake shoe 6; one end of the piston 2 is connected with a steel ball, and the steel ball protrudes out of the end face of the piston 2 and is abutted with the concave face of the worm wheel 3; one end of the screw rod 4 is in threaded connection with an inner hole of the worm wheel, and the other end of the screw rod is provided with a groove which is in contact with a shoe iron at the upper end of the front brake shoe 5 and is connected together in a meshing manner.
The using process of the invention is as follows:
when the worm gear is in work, other speed reducing mechanisms are used as input ends, specifically, the motor speed reducing mechanism is adopted, the output end of the motor speed reducing mechanism is fixedly connected with one end of a worm through a plug, a pin or a positioning key, the motor starts to rotate and is transmitted to the worm 1, the worm 1 drives the turbine 2 to roll relatively with the meshing position of the turbine 2, the turbine 2 gradually enters the meshing process and gradually exits the meshing process to realize transmission, the piston 3 is an independent part, one end of the piston does not rotate, a convex point at the other end of the piston is in contact with the turbine 2 and has a relative rolling trend, and the turbine 2 is used as a screw sleeve to be matched with the screw 4 to be used; because the turbine 2 (the threaded sleeve) rotates, the piston 3 is contacted with one end of the piston relatively and is not moved, and the other end of the piston causes the screw rod 4 to roll to generate a stroke to eject towards one end, so that ejection force is generated.
The transmission mechanism is installed on an automobile brake disc, one end of a groove of the piston 2 is in contact with and fixedly occluded with a shoe at the upper end of a rear brake shoe 6, one end of a convex surface of a steel ball of the piston 2 is in contact with one end of a concave surface of the worm wheel 3 and has a relative rolling trend, one end of the screw rod 4 is in threaded connection with an inner hole of the worm wheel, and the groove at the other end of the screw rod is in contact with and occluded with the shoe at the upper end of a front brake shoe 5; when braking, because the worm wheel 3 (threaded sleeve) rotates, the piston 2 is contacted with one end of the piston relatively immovably, and one end of the piston causes the screw rod 4 to rotate and roll to generate a stroke to eject out towards the direction of the front brake shoe 1, so that the upper ends of the front brake shoe and the rear brake shoe are respectively separated from the screw rod 4 and the piston 2, and then the brake shoes are contacted with a rotating brake disc, the brake disc drives the two brake shoes to rotate along the rotating direction under the action of friction torque until the rear brake shoe is abutted against the brake disc, then the brake shoes are further pressed against the brake disc, at the moment, the rear brake shoe is in a force increasing state, and under the action of the force aid of the front brake shoe, the thrust force applied to the lower end of the rear brake shoe by the floating adjusting ratchet wheel 7 is 2-3 times larger than the opening force. When the transmission work is finished, the input end controls the worm 1 to rotate reversely, and the worm returns to the initial position through a series of reverse transmissions.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (5)
1. A multi-stage transmission mechanism is characterized in that: including motor reduction gears, worm (1), worm wheel (3) and screw rod (4) that the drive used, motor reduction gears's output shaft end with the one end transmission of worm (1) is connected, worm (1) with worm wheel (3) slope is arranged the meshing and is connected, the internal thread connection of worm wheel (3) has screw rod (4), the one end of piston (2) with back brake shoe (3) fixed connection, the other end salient point of piston (2) with worm wheel (3) contact.
2. The multi-stage transmission according to claim 1, wherein: motor reduction gears's output shaft end with the tail end of worm (1) alternates the cooperation and connects, the head number of worm (1) sets up to 2, the number of teeth of worm wheel (3) sets up to 22, worm wheel (3) with the transmission screw thread outer wall of worm (1) is 20 pressure angle and meshes mutually, the pitch of screw rod (4) sets up to 2mm, and the tooth form angle of screw rod (4) sets up 30, the fluting one end of piston (2) with the horseshoe contact and the interlock of back brake shoe (3) are motionless, the convex surface steel ball one end of piston (2) with the concave surface one end contact of worm wheel (3) just has the relative roll trend.
3. The multi-stage transmission according to claim 2, wherein: the motor reduction mechanism specifically adopts a two-stage planetary gear for reduction, the transmission ratio of each stage is 4.5, the transmission ratio of the worm wheel (3) to the worm (1) is 11, the transmission ratio of the worm wheel (3) to the screw rod (4) is 11, and the total transmission ratio is 222.75.
4. The multi-stage transmission according to claim 2, wherein: the number of teeth of the worm wheel (3) is designed to be 22, the modulus is set to be 0.65, the pressure angle is set to be 20 degrees, the thread pitch is designed to be 2, the number of heads of the worm (1) is designed to be 2, the modulus is designed to be 0.65, and the thread pitch is set to be 2.041.
5. The multi-stage transmission according to claim 2, wherein: one end of the piston (2) is provided with a U-shaped groove, and the U-shaped groove is meshed and connected with a shoe of the rear brake shoe (6); one end of the piston (2) is connected with a steel ball, and the steel ball protrudes out of the end face of the piston (2) and is abutted against the concave face of the worm wheel (3); one end of the screw rod (4) is in threaded connection with an inner hole of the worm wheel, and the other end of the screw rod is provided with a groove which is in contact with a shoe iron at the upper end of the front brake shoe (5) and is connected together in a meshing manner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011289458.5A CN112443629A (en) | 2020-11-18 | 2020-11-18 | Multistage transmission mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011289458.5A CN112443629A (en) | 2020-11-18 | 2020-11-18 | Multistage transmission mechanism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112443629A true CN112443629A (en) | 2021-03-05 |
Family
ID=74738108
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011289458.5A Pending CN112443629A (en) | 2020-11-18 | 2020-11-18 | Multistage transmission mechanism |
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| Country | Link |
|---|---|
| CN (1) | CN112443629A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0694085A (en) * | 1992-09-16 | 1994-04-05 | Hitoshi Nakamura | Worm type reduction gear |
| JP2001082517A (en) * | 1999-09-10 | 2001-03-27 | Hosei Brake Ind Ltd | Actuator for motor-driven drum brake |
| WO2016031898A1 (en) * | 2014-08-29 | 2016-03-03 | 曙ブレーキ工業株式会社 | Drum brake apparatus |
| CN106460978A (en) * | 2014-06-26 | 2017-02-22 | 曙制动器工业株式会社 | Drum brake device |
| CN206812987U (en) * | 2016-10-17 | 2017-12-29 | 现代摩比斯株式会社 | Electronic brake device |
| CN214465853U (en) * | 2020-11-18 | 2021-10-22 | 霸州市华诚汽车制动器有限公司 | Multistage transmission mechanism |
-
2020
- 2020-11-18 CN CN202011289458.5A patent/CN112443629A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0694085A (en) * | 1992-09-16 | 1994-04-05 | Hitoshi Nakamura | Worm type reduction gear |
| JP2001082517A (en) * | 1999-09-10 | 2001-03-27 | Hosei Brake Ind Ltd | Actuator for motor-driven drum brake |
| CN106460978A (en) * | 2014-06-26 | 2017-02-22 | 曙制动器工业株式会社 | Drum brake device |
| WO2016031898A1 (en) * | 2014-08-29 | 2016-03-03 | 曙ブレーキ工業株式会社 | Drum brake apparatus |
| CN206812987U (en) * | 2016-10-17 | 2017-12-29 | 现代摩比斯株式会社 | Electronic brake device |
| CN214465853U (en) * | 2020-11-18 | 2021-10-22 | 霸州市华诚汽车制动器有限公司 | Multistage transmission mechanism |
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