China Personal Care Planetary Gear Electric DC 4.2V Brushless Motor supplier

Merchandise Description

Personal Treatment planetary gear electric DC 4.2V brushless motor

 

Item Description

1)Specification

Product

 Application Parameters Rated Torque of Equipment Box
 
Instant Torque of Gear Box
 
Gear Ratio
 
Gear Box Duration
 L1
Rated At No Load
 
At Rated Load  Overall Length 
 L
Voltage
 
Pace
 
Recent
 
Speed
 
Existing
 
Torque
 
VDC rpm mA rpm mA gf.cm mN.m mm gf.cm gf.cm mm
ZWPD008008- four four.2 4233 ninety 3111 one hundred fifty five four .4 23.one 50 200 3.6 8.6
ZWPD008008- 5 4.two 2857 90 2100 155 6 .six fifty 200 5.three
ZWPD008008- 13 4.two 1122 ninety five 864 one hundred fifty five eleven one.one 25.8 one hundred three hundred 13. 11.3
ZWPD008008- 19 4.two 758 95 583 one hundred fifty five 16 one.6 a hundred three hundred 19.2
ZWPD008008-28 four.2 511 ninety five 394 one hundred fifty five 24 two.four a hundred three hundred 28.four
ZWPD008008-47 4.two 306 ninety five 240 160 30 2.9 28.five 200 600 forty six.7 14.
ZWPD008008-69 4.two 207 95 162 a hundred and sixty 44 four.three two hundred 600 69.1
ZWPD008008-102 four.two 140 ninety five 109 a hundred and sixty 65 six.four two hundred 600 102.4
ZWPD008008-152 four.2 ninety four 95 seventy four a hundred and sixty ninety six nine.four 200 600 151.seven
ZWPD008008-168 four.2 eighty four 100 67 160 80 seven.eight 31.2 three hundred 900 168. sixteen.seven
ZWPD008008-249 four.2 56 a hundred 45 a hundred and sixty 118 11.six 300 900 248.8
ZWPD008008-369 four.two 38 a hundred thirty 160 175 seventeen.2 three hundred 900 368.six
ZWPD008008-546 four.2 26 100 21 a hundred and sixty 259 25.4 three hundred 900 546.one
ZWPD008008-809 4.two 17 100 14 one hundred sixty 384 37.seven three hundred 900 809.1

over specs just for reference and customizable according to demands.

Integrated Push Management Module.

Please enable us know your specifications and we will give you with micro transmission remedies.

2)2nd Drawing

 

Comprehensive Images

 

 

Application

Sensible wearable devices   watch,VR,AR,XR and and so forth.
Household software kitchen area appliances, sewing equipment, corn popper, vacuum cleaner, yard device, sanitary ware, window curtain, smart closestool, sweeping robotic, electricity seat, standing desk, electric couch, Television, pc, treadmill, spyhole, cooker hood, electrical drawer, electric powered mosquito web, smart cupboard, intelligent wardrobe, computerized soap dispenser, UV little one bottle sterilizer, lifting very hot pot cookware, dishwasher, washing device, meals breaking equipment, dryer, air conditioning, dustbin, espresso device, whisk,smart lock,bread maker,Window cleansing robot and and so forth.
interaction products 5G base station,video meeting,cell mobile phone and and so forth.
Office automation equipments   scanners, printers, multifunction devices duplicate machines, fax (FAX paper cutter), personal computer peripheral, bank device,  screen, lifting socket,  screen,notebook Computer and and many others.
Automotive products  conditioning damper actuator, vehicle DVD,doorway lock actuator, retractable rearview mirror, meters, optic axis control device, head light-weight beam degree adjuster, vehicle water pump, car antenna, lumbar support, EPB, automobile tail gate electric powered putter, HUD, head-up screen, automobile sunroof, EPS, AGS, car window, head restraint, E-booster, car seat, car charging station and and many others.
Toys and models  radio handle product, automatic cruise management, ride-on toy, instructional robot, programming robotic, medical robot, computerized feeder, intelligent building blocks, escort robotic and and so on.
Health care equipments  blood stress meter, breath device, medical cleansing pump, healthcare bed, blood stress displays, health-related ventilator, surgical staplers, infusion pump, dental instrument, self-clotting cutter, wound cleansing pump for orthopedic surgical procedure,digital cigarette, eyebrow pencil,fascia gun, , surgical robot,laboratory automation and etc.
Industrials   flow handle valves, seismic tests,automatic reclosing,Agricultural unmanned aerial car,automatic feeder ,smart categorical cupboard and and so forth.
Electrical electricity tools  electric drill, screwdriver,backyard garden instrument and etc.
Precision instruments  optics devices,automated vending device, wire-stripping device and and so on.
Personal care tooth brush, hair clipper, electric shaver, massager, vibrator, hair dryer, rubdown equipment, scissor hair machine, foot grinder,anti-myopia pen, facial beauty products, hair curler,Electric powered threading knife,Energy Excellent PORE, Puff device,eyebrow tweezers and and so on.
Buyer electronics camera, cell telephone,electronic digital camera, automated retracting gadget,camcorder,  kinescope DVD,headphone stereo, cassette tape recorder, bluetooth earbud charging circumstance, turntable, tablet,UAV(unmanned aerial car),surveillance digital camera,PTZ digicam, rotating sensible speaker and etc.
robots educational robot, programming robot, health care robot, escort robotic and etc.

 

Business Profile

HangZhou CZPT Equipment & Electronics Co., Ltd was recognized in 2001,We supply the total travel solution for consumers from design, tooling fabrication, components manufacturing and assembly. 

Workshop


Tests Tools

1) Aggressive Benefits

  • one) Competitive Positive aspects
    19+calendar year knowledge in producing motor gearbox
    We provide complex assist from r&d, prototype, screening, assembly and serial manufacturing , ODM &OEM
    Aggressive Value
    Product Performance: Reduced noise, Higher performance, Long lifespan
    Prompt Delivery: fifteen working times after payment
    Small Orders Acknowledged

 2) Major Products

  • Precision reduction gearbox and its diameter:3.4mm-38mm,voltage:1.5-24V,energy: .01-40W,output velocity:5-2000rpm and output torque:1. gf.cm -50kgf.cm,

  • Tailored worm and gear transmission machinery
  • Specific electromechanical movement module
  • Exact component and assembly of plastic and steel powder injection.

 

Our Providers

  • ODM & OEM
  • Gearbox design and style and development
  • Connected engineering help
  • Micro generate gearbox customized solution

Packaging & Transport

one) Packing Information

packed in nylon first of all, then carton, and then reinforced with wood case for outer packing.
Or according to client’s requirement.

two) Shipping and delivery Details

samples will be delivered inside of ten times
batch get top time in accordance to the genuine predicament.

 

Certifications

Certifications

We Have passed to hold ISO9001:2015(CN11/3571),ISO14001:2004(U006616E0153R3M), ISO13485:2016(CN18/42018) and IATF16949:2016(CN11/3571.01).

and more…

 

FAQ

FAQ

one. Can you make the gearbox with custom made requirements?
Indeed. We have design and style and advancement group, also a excellent time period of engineers, each and every of them have
many operate several years experience.

two.Do you give the samples?
Sure. Our firm can offer the samples to you, and the shipping time is about 5-15days according to the specification of gearbox you need to have.

three.What is your MOQ?
Our MOQ is 2000pcs. But at the commencing of our enterprise, we accept tiny order.

four. Do you have the merchandise in stock?
I am sorry we donot have the product in stock, All items are created with orders.

five. Do you offer technologies assistance?
Indeed. Our organization have layout and growth group, we can give technology assistance if you
require.

six.How to ship to us?
We will ship the goods to you according to the DHL or UPS or FEDEX and many others account you offer. 

seven.How to pay the income?
We settle for T/T in progress. Also we have various lender account for acquiring funds, like US dollors or RMB etc.

8. How can I know the product is suitable for me?
Frist, you want to offer us the much more specifics info about the item. We will advise the item to you according to your requirement of specification. Following you confirm, we will prepare the samples to you. also we will offer some good developments in accordance to your solution use.

nine. Can I occur to your company to visit?
Indeed, you can occur to our firm to go to at at any time, and welcome to visit our organization.

10. How do get in touch with us ?
Please send an inquiry

US $6-8
/ Piece
|
1,000 Pieces

(Min. Order)

###

Application: Universal, Industrial, Household Appliances, Car, Power Tools, Medical Devices
Operating Speed: Low Speed
Excitation Mode: Permanent Magnet
Function: Control
Casing Protection: Drip-Proof
Number of Poles: 4

###

Samples:
US$ 85/Piece
1 Piece(Min.Order)

|
Request Sample

###

Customization:

###

Model

 Application Parameters Rated Torque of Gear Box
 
Instant Torque of Gear Box
 
Gear Ratio
 
Gear Box Length
 L1
Rated At No Load
 
At Rated Load  Overall Length 
 L
Voltage
 
Speed
 
Current
 
Speed
 
Current
 
Torque
 
VDC rpm mA rpm mA gf.cm mN.m mm gf.cm gf.cm mm
ZWPD008008- 4 4.2 4233 90 3111 155 4 0.4 23.1 50 200 3.6 8.6
ZWPD008008- 5 4.2 2857 90 2100 155 6 0.6 50 200 5.3
ZWPD008008- 13 4.2 1122 95 864 155 11 1.1 25.8 100 300 13.0 11.3
ZWPD008008- 19 4.2 758 95 583 155 16 1.6 100 300 19.2
ZWPD008008-28 4.2 511 95 394 155 24 2.4 100 300 28.4
ZWPD008008-47 4.2 306 95 240 160 30 2.9 28.5 200 600 46.7 14.0
ZWPD008008-69 4.2 207 95 162 160 44 4.3 200 600 69.1
ZWPD008008-102 4.2 140 95 109 160 65 6.4 200 600 102.4
ZWPD008008-152 4.2 94 95 74 160 96 9.4 200 600 151.7
ZWPD008008-168 4.2 84 100 67 160 80 7.8 31.2 300 900 168.0 16.7
ZWPD008008-249 4.2 56 100 45 160 118 11.6 300 900 248.8
ZWPD008008-369 4.2 38 100 30 160 175 17.2 300 900 368.6
ZWPD008008-546 4.2 26 100 21 160 259 25.4 300 900 546.1
ZWPD008008-809 4.2 17 100 14 160 384 37.7 300 900 809.1

###

Smart wearable devices   watch,VR,AR,XR and etc.
Household application kitchen appliances, sewing machines, corn popper, vacuum cleaner, garden tool, sanitary ware, window curtain, intelligent closestool, sweeping robot, power seat, standing desk, electric sofa, TV, computer, treadmill, spyhole, cooker hood, electric drawer, electric mosquito net, intelligent cupboard, intelligent wardrobe, automatic soap dispenser, UV baby bottle sterilizer, lifting hot pot cookware, dishwasher, washing machine, food breaking machine, dryer, air conditioning, dustbin, coffee machine, whisk,smart lock,bread maker,Window cleaning robot and etc.
communication equipment 5G base station,video conference,mobile phone and etc.
Office automation equipments   scanners, printers, multifunction machines copy machines, fax (FAX paper cutter), computer peripheral, bank machine,  screen, lifting socket,  display,notebook PC and etc.
Automotive products  conditioning damper actuator, car DVD,door lock actuator, retractable rearview mirror, meters, optic axis control device, head light beam level adjuster, car water pump, car antenna, lumbar support, EPB, car tail gate electric putter, HUD, head-up display, vehicle sunroof, EPS, AGS, car window, head restraint, E-booster, car seat, vehicle charging station and etc.
Toys and models  radio control model, automatic cruise control, ride-on toy, educational robot, programming robot, medical robot, automatic feeder, intelligent building blocks, escort robot and etc.
Medical equipments  blood pressure meter, breath machine, medical cleaning pump, medical bed, blood pressure monitors, medical ventilator, surgical staplers, infusion pump, dental instrument, self-clotting cutter, wound cleaning pump for orthopedic surgery,electronic cigarette, eyebrow pencil,fascia gun, , surgical robot,laboratory automation and etc.
Industrials   flow control valves, seismic testing,automatic reclosing,Agricultural unmanned aerial vehicle,automatic feeder ,intelligent express cabinet and etc.
Electric power tools  electric drill, screwdriver,garden tool and etc.
Precision instruments  optics instruments,automatic vending machine, wire-stripping machine and etc.
Personal care tooth brush, hair clipper, electric shaver, massager, vibrator, hair dryer, rubdown machine, scissor hair machine, foot grinder,anti-myopia pen, facial beauty equipment, hair curler,Electric threading knife,POWER PERFECT PORE, Puff machine,eyebrow tweezers and etc.
Consumer electronics camera, mobile phone,digital camera, automatic retracting device,camcorder,  kinescope DVD,headphone stereo, cassette tape recorder, bluetooth earbud charging case, turntable, tablet,UAV(unmanned aerial vehicle),surveillance camera,PTZ camera, rotating smart speaker and etc.
robots educational robot, programming robot, medical robot, escort robot and etc.
US $6-8
/ Piece
|
1,000 Pieces

(Min. Order)

###

Application: Universal, Industrial, Household Appliances, Car, Power Tools, Medical Devices
Operating Speed: Low Speed
Excitation Mode: Permanent Magnet
Function: Control
Casing Protection: Drip-Proof
Number of Poles: 4

###

Samples:
US$ 85/Piece
1 Piece(Min.Order)

|
Request Sample

###

Customization:

###

Model

 Application Parameters Rated Torque of Gear Box
 
Instant Torque of Gear Box
 
Gear Ratio
 
Gear Box Length
 L1
Rated At No Load
 
At Rated Load  Overall Length 
 L
Voltage
 
Speed
 
Current
 
Speed
 
Current
 
Torque
 
VDC rpm mA rpm mA gf.cm mN.m mm gf.cm gf.cm mm
ZWPD008008- 4 4.2 4233 90 3111 155 4 0.4 23.1 50 200 3.6 8.6
ZWPD008008- 5 4.2 2857 90 2100 155 6 0.6 50 200 5.3
ZWPD008008- 13 4.2 1122 95 864 155 11 1.1 25.8 100 300 13.0 11.3
ZWPD008008- 19 4.2 758 95 583 155 16 1.6 100 300 19.2
ZWPD008008-28 4.2 511 95 394 155 24 2.4 100 300 28.4
ZWPD008008-47 4.2 306 95 240 160 30 2.9 28.5 200 600 46.7 14.0
ZWPD008008-69 4.2 207 95 162 160 44 4.3 200 600 69.1
ZWPD008008-102 4.2 140 95 109 160 65 6.4 200 600 102.4
ZWPD008008-152 4.2 94 95 74 160 96 9.4 200 600 151.7
ZWPD008008-168 4.2 84 100 67 160 80 7.8 31.2 300 900 168.0 16.7
ZWPD008008-249 4.2 56 100 45 160 118 11.6 300 900 248.8
ZWPD008008-369 4.2 38 100 30 160 175 17.2 300 900 368.6
ZWPD008008-546 4.2 26 100 21 160 259 25.4 300 900 546.1
ZWPD008008-809 4.2 17 100 14 160 384 37.7 300 900 809.1

###

Smart wearable devices   watch,VR,AR,XR and etc.
Household application kitchen appliances, sewing machines, corn popper, vacuum cleaner, garden tool, sanitary ware, window curtain, intelligent closestool, sweeping robot, power seat, standing desk, electric sofa, TV, computer, treadmill, spyhole, cooker hood, electric drawer, electric mosquito net, intelligent cupboard, intelligent wardrobe, automatic soap dispenser, UV baby bottle sterilizer, lifting hot pot cookware, dishwasher, washing machine, food breaking machine, dryer, air conditioning, dustbin, coffee machine, whisk,smart lock,bread maker,Window cleaning robot and etc.
communication equipment 5G base station,video conference,mobile phone and etc.
Office automation equipments   scanners, printers, multifunction machines copy machines, fax (FAX paper cutter), computer peripheral, bank machine,  screen, lifting socket,  display,notebook PC and etc.
Automotive products  conditioning damper actuator, car DVD,door lock actuator, retractable rearview mirror, meters, optic axis control device, head light beam level adjuster, car water pump, car antenna, lumbar support, EPB, car tail gate electric putter, HUD, head-up display, vehicle sunroof, EPS, AGS, car window, head restraint, E-booster, car seat, vehicle charging station and etc.
Toys and models  radio control model, automatic cruise control, ride-on toy, educational robot, programming robot, medical robot, automatic feeder, intelligent building blocks, escort robot and etc.
Medical equipments  blood pressure meter, breath machine, medical cleaning pump, medical bed, blood pressure monitors, medical ventilator, surgical staplers, infusion pump, dental instrument, self-clotting cutter, wound cleaning pump for orthopedic surgery,electronic cigarette, eyebrow pencil,fascia gun, , surgical robot,laboratory automation and etc.
Industrials   flow control valves, seismic testing,automatic reclosing,Agricultural unmanned aerial vehicle,automatic feeder ,intelligent express cabinet and etc.
Electric power tools  electric drill, screwdriver,garden tool and etc.
Precision instruments  optics instruments,automatic vending machine, wire-stripping machine and etc.
Personal care tooth brush, hair clipper, electric shaver, massager, vibrator, hair dryer, rubdown machine, scissor hair machine, foot grinder,anti-myopia pen, facial beauty equipment, hair curler,Electric threading knife,POWER PERFECT PORE, Puff machine,eyebrow tweezers and etc.
Consumer electronics camera, mobile phone,digital camera, automatic retracting device,camcorder,  kinescope DVD,headphone stereo, cassette tape recorder, bluetooth earbud charging case, turntable, tablet,UAV(unmanned aerial vehicle),surveillance camera,PTZ camera, rotating smart speaker and etc.
robots educational robot, programming robot, medical robot, escort robot and etc.

Dynamic Modeling of a Planetary Motor

A planetary gear motor consists of a series of gears rotating in perfect synchrony, allowing them to deliver torque in a higher output capacity than a spur gear motor. Unlike the planetary motor, spur gear motors are simpler to build and cost less, but they are better for applications requiring lower torque output. That is because each gear carries the entire load. The following are some key differences between the two types of gearmotors.

planetary gear system

A planetary gear transmission is a type of gear mechanism that transfers torque from one source to another, usually a rotary motion. Moreover, this type of gear transmission requires dynamic modeling to investigate its durability and reliability. Previous studies included both uncoupled and coupled meshing models for the analysis of planetary gear transmission. The combined model considers both the shaft structural stiffness and the bearing support stiffness. In some applications, the flexible planetary gear may affect the dynamic response of the system.
In a planetary gear device, the axial end surface of the cylindrical portion is rotatable relative to the separating plate. This mechanism retains lubricant. It is also capable of preventing foreign particles from entering the planetary gear system. A planetary gear device is a great choice if your planetary motor’s speed is high. A high-quality planetary gear system can provide a superior performance than conventional systems.
A planetary gear system is a complex mechanism, involving three moving links that are connected to each other through joints. The sun gear acts as an input and the planet gears act as outputs. They rotate about their axes at a ratio determined by the number of teeth on each gear. The sun gear has 24 teeth, while the planet gears have three-quarters that ratio. This ratio makes a planetary motor extremely efficient.
Motor

planetary gear train

To predict the free vibration response of a planetary motor gear train, it is essential to develop a mathematical model for the system. Previously, static and dynamic models were used to study the behavior of planetary motor gear trains. In this study, a dynamic model was developed to investigate the effects of key design parameters on the vibratory response. Key parameters for planetary gear transmissions include the structure stiffness and mesh stiffness, and the mass and location of the shaft and bearing supports.
The design of the planetary motor gear train consists of several stages that can run with variable input speeds. The design of the gear train enables the transmission of high torques by dividing the load across multiple planetary gears. In addition, the planetary gear train has multiple teeth which mesh simultaneously in operation. This design also allows for higher efficiency and transmittable torque. Here are some other advantages of planetary motor gear trains. All these advantages make planetary motor gear trains one of the most popular types of planetary motors.
The compact footprint of planetary gears allows for excellent heat dissipation. High speeds and sustained performances will require lubrication. This lubricant can also reduce noise and vibration. But if these characteristics are not desirable for your application, you can choose a different gear type. Alternatively, if you want to maintain high performance, a planetary motor gear train will be the best choice. So, what are the advantages of planetary motor gears?

planetary gear train with fixed carrier train ratio

The planetary gear train is a common type of transmission in various machines. Its main advantages are high efficiency, compactness, large transmission ratio, and power-to-weight ratio. This type of gear train is a combination of spur gears, single-helical gears, and herringbone gears. Herringbone planetary gears have lower axial force and high load carrying capacity. Herringbone planetary gears are commonly used in heavy machinery and transmissions of large vehicles.
To use a planetary gear train with a fixed carrier train ratio, the first and second planets must be in a carrier position. The first planet is rotated so that its teeth mesh with the sun’s. The second planet, however, cannot rotate. It must be in a carrier position so that it can mesh with the sun. This requires a high degree of precision, so the planetary gear train is usually made of multiple sets. A little analysis will simplify this design.
The planetary gear train is made up of three components. The outer ring gear is supported by a ring gear. Each gear is positioned at a specific angle relative to one another. This allows the gears to rotate at a fixed rate while transferring the motion. This design is also popular in bicycles and other small vehicles. If the planetary gear train has several stages, multiple ring gears may be shared. A stationary ring gear is also used in pencil sharpener mechanisms. Planet gears are extended into cylindrical cutters. The ring gear is stationary and the planet gears rotate around a sun axis. In the case of this design, the outer ring gear will have a -3/2 planet gear ratio.
Motor

planetary gear train with zero helix angle

The torque distribution in a planetary gear is skewed, and this will drastically reduce the load carrying capacity of a needle bearing, and therefore the life of the bearing. To better understand how this can affect a gear train, we will examine two studies conducted on the load distribution of a planetary gear with a zero helix angle. The first study was done with a highly specialized program from the bearing manufacturer INA/FAG. The red line represents the load distribution along a needle roller in a zero helix gear, while the green line corresponds to the same distribution of loads in a 15 degree helix angle gear.
Another method for determining a gear’s helix angle is to consider the ratio of the sun and planet gears. While the sun gear is normally on the input side, the planet gears are on the output side. The sun gear is stationary. The two gears are in engagement with a ring gear that rotates 45 degrees clockwise. Both gears are attached to pins that support the planet gears. In the figure below, you can see the tangential and axial gear mesh forces on a planetary gear train.
Another method used for calculating power loss in a planetary gear train is the use of an auto transmission. This type of gear provides balanced performance in both power efficiency and load capacity. Despite the complexities, this method provides a more accurate analysis of how the helix angle affects power loss in a planetary gear train. If you’re interested in reducing the power loss of a planetary gear train, read on!

planetary gear train with spur gears

A planetary gearset is a type of mechanical drive system that uses spur gears that move in opposite directions within a plane. Spur gears are one of the more basic types of gears, as they don’t require any specialty cuts or angles to work. Instead, spur gears use a complex tooth shape to determine where the teeth will make contact. This in turn, will determine the amount of power, torque, and speed they can produce.
A two-stage planetary gear train with spur gears is also possible to run at variable input speeds. For such a setup, a mathematical model of the gear train is developed. Simulation of the dynamic behaviour highlights the non-stationary effects, and the results are in good agreement with the experimental data. As the ratio of spur gears to spur gears is not constant, it is called a dedendum.
A planetary gear train with spur gears is a type of epicyclic gear train. In this case, spur gears run between gears that contain both internal and external teeth. The circumferential motion of the spur gears is analogous to the rotation of planets in the solar system. There are four main components of a planetary gear train. The planet gear is positioned inside the sun gear and rotates to transfer motion to the sun gear. The planet gears are mounted on a joint carrier that is connected to the output shaft.
Motor

planetary gear train with helical gears

A planetary gear train with helical teeth is an extremely powerful transmission system that can provide high levels of power density. Helical gears are used to increase efficiency by providing a more efficient alternative to conventional worm gears. This type of transmission has the potential to improve the overall performance of a system, and its benefits extend far beyond the power density. But what makes this transmission system so appealing? What are the key factors to consider when designing this type of transmission system?
The most basic planetary train consists of the sun gear, planet gear, and ring gear elements. The number of planets varies, but the basic structure of planetary gears is similar. A simple planetary geartrain has the sun gear driving a carrier assembly. The number of planets can be as low as two or as high as six. A planetary gear train has a low mass inertia and is compact and reliable.
The mesh phase properties of a planetary gear train are particularly important in designing the profiles. Various parameters such as mesh phase difference and tooth profile modifications must be studied in depth in order to fully understand the dynamic characteristics of a PGT. These factors, together with others, determine the helical gears’ performance. It is therefore essential to understand the mesh phase of a planetary gear train to design it effectively.

China Personal Care Planetary Gear Electric DC 4.2V Brushless Motor     supplier China Personal Care Planetary Gear Electric DC 4.2V Brushless Motor     supplier
editor by czh 2022-12-21