减速机技术资料：

减速机的型号有很多种，根据齿形分类的话，大致可分为几类：圆弧齿减速机，圆柱齿轮减速机，包络减速机，下面介绍一下圆弧齿的特点： 　　由于圆弧齿轮提供了低的接触应力和有一个短厚有力的轮齿，似乎它们比渐开线齿轮更优越。对一些相对来说要求不高的低速场合，这种齿轮是有一定的长处，但所遇到的间题有: 　　(1)齿轮对中心距敏感，因此齿轮直径和齿轮箱中心距必须严格限制在容许范围内。 　　(2)短厚的轮齿刚性极高。这在转速很低时是没有坊碍的，但在中等速度时，由于制造误差齿上会受到一个比渐开线轮齿大得多的啮合力，从而产生非常大的振动。 　　(3)轮齿表面不能够用展成法加工，因此仅能采用成形磨前或滚铣。这种制造方式限制它在大型齿轮中的使用，并使这类齿轮传动倾向于采用不要求磨前的较软材料。 　　(4)两轮齿间力的方向保持不变，而且如果能保持高精度，则力的大小也保持不变，但力的作用位置沿着轮齿变化，即在轴向接触椭圆从齿宽的一端消失时而相应的接触已在另一端开始。这种力的作用位置的变化是振动和噪声产生的固有原因，在实际中不能消除，但通过齿廓复映后可以大大减小，却又导致负载能力的减小。 　　对制造误差的敏感性，固有的高振动量级和制造的困难，这三者集中起来，已使圆弧齿轮减速机不成为渐开线齿轮的竟争对手，因为通常能用传统的齿轮更经济地解决问题。

SMC NP420-DN1 Valve Controller with 16 SMC Valves R

SMC ACTUATOR AIR GRIPPER MHL2-32D NEW MHL232D


SMC PAP3310-P11 Process Pump with 60 day warranty


SMC 61-600406-003 with 60 day warranty


Allen Bradley SMC Soft Start Motor Controller (2 units) with Hoffman Enclosure

SMC SMC5912 720.397 TIGERSTACK II 10/100 5912 HUB


Ideal DestroyIt 2603 SMC Cutting Head 2620 805

Porsche Steel Disc Brake Wheel, Chrome, 4 1/2x 15 (Refurbished) 356/911/912

SMC Digital Flow Switch For Water, PF2W711-00-67N-X526

Valve Manifold SMC, VV5Q11-16C6SD-DKRS


SMC MY1C32G-300L-Z80 NEW RODLESS CYLINDER MECH JT MY1C32G300LZ80

SMC CYLINDER SLIDE TABLE MXQ16-75-M9B NEW MXQ1675M9B

Nortel ED1639001E5 SMC 245050-USER LICENSE NEW CS 1000

SMC X980328-4-1 PNEUMATIC CYLINDER W/TURCK OUTPUTS NEW*


SMC X980328-3-4 PNEUMATIC CYLINDER W/TURCK OUTPUTS NEW*


ALLEN-BRADLEY SMC-2 150-A54NB-ND SERIES A MOTOR CONTROLLER ~ USED

AMAT 70317884100 BOARD ASSY SMC/M

SMC MY1H32-250 NSPP MY1H32250

SMC MRQBS40-20CB USPP MRQBS4020CB

SMC VFS 2000 SERIES 20 VALVE MANIFOLD COMPLETE


SMC MXQ25-40BSR CYL, SLIDE TABLE, SHOCK ABSORB

SMC6400B, Stand-alone 4-Axis Motion Controller, Leadshine(Leadtech)

New SMC Pneumatic Cylinder MY1C50-700H


FMF Racing Slip On Exhaust Muffler 045260 for KTM 690 SMC 2008-2011


smc PENTAX DA 55-300mm F4-5.8 ED Lens

SMC AM850-N14-T MIST SEPARATOR MAX PRESSURE: 1.0 MPA FLOW RATE: 12000 I/MIN NEW


FMF Apex Exhaust 2008-11 KTM 690 SMC Enduro Carbon Fiber / 045260

SMC MGCLB50-350-R-K59WL-XC18 CYLINDER GUIDE BEARING ***NIB***

SMC CEP1B20-25L-A93L USPP CEP1B2025LA93L

SMC LLC4A01-T20X35 NSFP LLC4A01T20X35

SMC Pneumatic Table Slide MXQ8-75ASR NEW SEAL

SMC MYC25G-150L Air Linear Actuators NEW

SMC MYC25G-300-M5NL Air Linear Actuators NEW

SMC MYC32G-400H Air Linear Actuators NEW

SMC Cylinder MY1B25-2285H-X_110 96" Travel Rodless Cylinder 

SMC CNADN100N-250-D XC35 Cylinder

08-10 KTM 690 SMC FMF Apex Slip On Carbon Fiber / Titanium Race Exhaust Muffler


08-10 KTM 690 SMC FMF Apex Slip On Titanium / Carbon Fiber Race Exhaust Muffler


Pentax DA 1:4/16-45 mm SMC Pentax-DA

SMC ACNL-X2-160X380-S NSPP ACNLX2160X380S

Pypes 08-10 Challenger Cat-Back Systems Polished Stainless Steel Street Pro 


Pypes 08-10 Challenger Cat-Back Systems Polished Stainless Steel Tips Race Pro 


Pypes 08-10 Challenger Cat-Back Systems Polished Stainless Steel Violator 


SMC LMU-200-10 NSFP LMU20010

SMC MXQ25-75A NSPP MXQ2575A

[ PENTAX ] SMC 67 MF SOFT 120MM F3.5 TELEPHOTO LENS PRIME MINT

SMC MRQFS32-5CA-A73L-XN USPP MRQFS325CAA73LXN

SMC Si Devicenet EX250-SDN1 Solenoid Pneumatic Manifold

LOT OF 10 SMC SV1A00-5FU PNEUMATIC VALVES DOUBLE SOLENOID W/ PNEUMATIC MANIFOLD 

NEW SMC MXQ12-75A AIR SLIDE TABLE 12MM BORE 75MM STROKE

Lantech 31025633 P/N 31021183 SMC 0507 

SMC CDLAFN80-400-E-J59W USPP CDLAFN80400EJ59W

Pentax SMC DA 10-17mm F/3.5-4.5 ED [IF] Fisheye K Mount Auto Focus Lens, 10mm

SMC CDLQF100-50DC-F NSFP CDLQF10050DCF

SMC MRQBS32-30CB NSPP MRQBS3230CB

SMC MODEL VEX1921-203DZ-G PNEUMATIC VALVE NNB!!!

SMC Digital Flow Switch, 0190-15914, PF2W711-N10-27

ALLEN-BRADLEY 150-A16NA MOTOR CONTROLLER 16AMP SMC 200-240V OPEN TYPE

SMC SLIDE MXS12-75A-F9PL MXS12-75A


NEW SMC MXQ20L-100CSR SLIDE TABLE CYLINDER MXQ20L100CSR


SMC MY1B40-700L NSFP MY1B40700L

SMC SS5V4-W10SA1WD-07BS-N9 W/ EX500-S001 VALVE AND SERIAL INTERFACE UNIT NEW*

SMC CY1L15H-200B-A73 RODLESS CYL BORE 15mm STROKE 200mm

Pypes 2005 -10 Charger Cat-Back Systems Polished Stainless Steel Tips SteetPro


Pypes 2005 -10 Charger Cat-Back Systems Polished Stainless Steel Tips Violator


Pypes 2005 - 10 Charger Cat-Back Systems Polished Stainless Steel Tips Race Pro 


Allen Bradley #150-A05NA SMC-2 Motor Controler N 2/1

Pentax SMC 85mm 2.2 Soft Focus Manual Lens 85 F2.2

SMC Pneumatic Rodless Cylinder MY1C40-500L-Y59B *NIB*

NEW SMC MXQ16L-125ASF-M9NS PNEUMATIC SLIDE TABLE

SMC CDNAFN80-100-D-F5DWSC USPP CDNAFN80100DF5DW

FMF APEX EXHAUST KTM 690 SMC 2008-2011 TITANIUM with CARBON TIP - FREE SHIPPING!


Quadzilla SMC 300 XLC Quad Bike Genuine Sports Exhaust

Steel Drum Brake Wheel Set, Painted, 15 x 5 1/2, 356/356A/356C

Steel Drum Brake Wheel Set, Painted, 15 x 4 1/2, 356/356A/356C

SMC 48 Port 10/100 Switch + 4 SFP SMC6152L2 UK

ALLEN BRADLEY DISCONNECT BOX WITH 2X STARTERS,#2 20HP 30 A SMC, TIMER USED

SMC MXS25-150A USPP MXS25150A

SMC Cylinder MY1C20-200L-F9BV 

SMC CDBXWL25-50R-F7BVL NSFP CDBXWL2550RF7BVL

SMC Slide Bearing Rodless Cylinder Actuator 30cm Stroke


SMC MXQ2530B NSPP MXQ2530B

SMC MXQ16-125A NSPP MXQ16125A

SMC Actuator 200mm Stroke LXPBABD-200SB-F9N1-X13


Pentax SMC DA 17-70mm F/4.0 AL [IF] SDM Wide Angle Zoom K Mount Auto Focus Len

15576 NEW SMC VVFS2-E2I02A Manifold


SMC ACNL-X2-100X350-TA-X3380 USPP ACNLX2100X350TAX

SMC PENTAX DA 16-50mm f2.8 ED AL IF SDM 16-50/2.8 All purpose SHARP lens!

Enlarge
@Mint@ SMC Pentax-DA 40mm f/2.8 Limited ASAHI Pentax DA 40 F2.8 40/2.8 #008041

SMC PENTAX-DA 35mm f2.8 MACRO LIMITED/K20D/K-7/OPEN BOX

SMC NP420-DN1 Pneumatic Manifold US31729 0190-17845 working

SMC NP420-DN1 Pneumatic Manifold US31724 0190-17844 working

Ford Mustang SMC Hood With Steel Back Scoop Style Stock Length 67,68 1967,1968

SMC Pentax 67 300mm F4

SMC Corp. MXQ12L-20A-M9B Air Slide Table, Recirculating

SMC Pentax FA 100mm F2.8 Macro

smc PENTAX-DA 50-200mm F4-5.6 f/4-5.6 ED WR K-mount Lens NEW

OFFICIAL Pentax smc PENTAX-DA40mmF2.8 XS 

New SVF Multi Port 3" High Purity Valve SMC966ATETOT30

New Pentax smc P-DA 55-300mm Auto Focus Telephoto Zoom Lens Mp Hi-Res Optical 

SMC MXQ20-75A NSFP MXQ2075A

SMC MGCLB50-250-R-H7PW-XC18 CYLINDER GUIDE BEARING ***NIB***

SMC MGCLB50-250-R-H7BWL-XC18 CYLINDER GUIDE BEARING*NIB

SMC EX250-SEN1 USPP EX250SEN1

SMC VV5Q11-ULB970145 PNEUMATIC MANIFOLD 

SMC NCY2S40H-0300 NSPP NCY2S40H0300

SMC CA2B100-79/100-XC10 NSPP CA2B10079100XC10

SMC Pressure Gauge LDM-B12PA2CC1 1040-01218 LDM-B12PA2CC3 Lot of 6 Used Working

SMC HE Thermal Fuse for Cold Loop 0190-18443 new

SMC Pneumatic Block SV1-LRG006 Used Lot (6) EX500-S001

SMC CDS1GN125-614 NSFP CDS1GN125614

SMC Digital Pressure Switch ISE5B-T2-26L ISE6B-A2-26L Lot of 8 Used Working
SMC ZSE4BT1L FNFP ZSE4BT1L

SMC NCDQ2B50-ULA980019 Pneumatic Cylinder 3020-01176 lot of 10 working

SMC Pneumatic Manifold VV5Q11-ULB990251 NP420-DN1

SMC ECC50M-R-23-X USPP ECC50MR23X

SMC 20-CDS1GN140-310 NSFP 20CDS1GN140310

smc PENTAX DA 50-200mm F4-5.6 ED WR Lens

BRAND NEW Pentax Q with SMC Pentax 8.5mm kit Black + 32GB SDHC + FEDEX

BRAND NEW Pentax Q with SMC Pentax 8.5mm kit White + 32GB SDHC + FEDEX

Chevy Camaro Hood (SMC) W/SS Package With Scoop 1998-02

SMC CDL1L100-G2828-400 NSFP CDL1L100G2828400

Pentax SMC FA 50mm F1.4 Lens 
** BRAND NEW ** PENTAX UK STOCK ** SAME DAY DISPATCH **

Trunk LID w/ Spoiler - SMC - Fastback MSTK6768-5

Pentax SMC DA 18-135mm F/3.5-5.6 Lens

SMC NCDQB125-U1A97 Pneumatic Cylinder AMAT 0010-03051

SMC Actuator CS1FF125-200 Max Press 0.97MPa

Pentax SMC-DA 70mm F/2.4 Limited Black Lens

Enlarge
Pentax SMC 30mm f2.8 - Mint !!

SMC Pneumatic Slide Table MXW25-150 150mm Stroke

Allen Bradley SMC Plus Motor Control, 150-A54NBDC, 40888-313-54, USED, WARRANTY


Applied Materials 0100-38029 Fast Lift, SMC MXS16-30-X609, PK266-02A, Assembly

SMC Manifold Solenoid Valve EX250-SEN1 IP

SMC -- ACTUATOR CYCLINDER -- NCY3B40-1900 -- 26" Overall Length

SANYO DENKI PROA030SMC102 BL SUPER PR SERVO AMPLIFIER

Pentax SMC-M 20/4 # 7000403 ...... W/Caps 

Pentax-A SMC 135/2.8 # 5036412 ...... Minty/Caps

Pentax-A SMC 135/2.8 # 5038315 ...... Minty

Pentax SMC 135/2.5 K mount # 5083022 ...... MINT

NIB ALLEN-BRADLEY, BULLETIN 150 SMC FAN. (BIN 43)


*EX* Pentax SMC Pentax-A 300mm f/4 fit pentax 67, 300/4

3 New Novellus 02-291754-00 SMC Actuation Cylinder Valv

SMC SLIDE MXS12-100A-F9PL MXS12-100A


SMC MGQM40-200 LINEAR SLIDE AIR / PNEUMATIC CYLINDER 40mm BORE 200mm STROKE - NE

SMC Pneumatic Air Slide Cylinder MGCLB50-560-C732 

SMC Pneumatic Brake Cylinder CLAGN100-U1A000618 (NIB)

Allen Bradley SMC-2 Soft Start 15hp 460vac 150-A24NB

CNB SMC1065N 500TVL 10X Indoor Mini Speed Dome PTZ Camera (NEW)


SMC SLIDE MY1M40-100A-Y7PL-X C18-X416 MY1M40

SMC Solenoid Pneumatic Maniflold, EX250

SMC DeviceNet EX230-SDN1 Interface with Manifold VV815-03S-SUQW0 Surplus

SMC MXQ20-75R Pneumatic Parts - Fittings - Actuator, Cyl, Slide Table

SMC - Pneumatic Slide Table - Very Nice!

SMC MY1B40-1500H 1500L Rodless Guided Air Cylinder Mechanical Joint Actuator THK


SMC MRHQ10D-90S-N Gripper Rotary Double Action

Pentax SMC FA 645 AF 75mm f/2.8 Auto focus Lens 5725487 MINT-


SMC Pneumatics MXS20-150 0.15-0.7MPs Pneumatic Slide 150mm 

SMC NVFS3100-3FZC SOLENOID VALVE + MANIFOLD BASE

Pentax SMC 8-24mm Zoom Eyepiece 70509 - Acclaimed Telescope & Spotting Scope EP

SMC Pneumatic 10 Valve Manifold W/ EX250-SEN1 Ethernet/IP

NEW SMC MXQ16L-100AS-M9NSDPC PNEUMATIC SLIDE TABLE

SMC Pneumatic Manifold EX250-SEN1 Ethernet/IP Unit 8 Valve Unit (A)

SMC Pneumatic Manifold EX250-SEN1 Ethernet/IP Unit 8 Valve Unit

ALLEN BRADLEY SMC-2 SMART MOTOR CONTROLLER 150-A05NA

SMC AW3000-02B AW300002B (1pc)/ AR2060-02 AR206002 (1pc)/ ISE40-01-22L-M (2pc)

SMC NCDY2S40H-2500B CYLINDER RODLESS SLIDER ***XLNT***

SMC NCY2B40H-3500 BASIC RODLESS CYLINDER ***NIB***

Smc cylinder Rotary table MSQB200R-A93L

SMC Pneu NP420-DN1 Manifold VQ1101Y-5 Valve / VV5Q11-ULB970095 AMAT 4060-001101

8 SMC 1/2" NPT 12V DC Solenoid Valves & 4 1/2 DUMP Controls Air Ride Suspension

smc PENTAX DA 70mm f/2.4 Limited Exc+

SMC LLC4A01-T20X35 NSPP LLC4A01T20X35

SMC PFW720-N04-27 Digital Flow Switch Water Display

Ford Mustang SMC Hood With Steel Back Scoop Style Stock Length 65,66 1965,1966

SMC CDL1L100-01-24340-1-125 NSFP CDL1L10001243401

Smc VEA130 SMC E-P Proportional Valve Power Amp 110V - New, No Box


Sinister Diesel EGR Cooler Delete Coolant Filtration Kit 03-07 Ford Powerstroke

APC SMC10002U Smart UPS C 1000VA 2U LCD SMC1000-2U

SMC ACNL-X2-125X125-TAS NSPP ACNLX2125X125TAS

TOTAL CONTROL PRODUCTS SMC21100-8KOA-O USPP SMC211008KOAO

SMC CL1BQ80-01-28088-1 NSFP CL1BQ8001280881

FANUC SMC21100-8POA-0 USPP SMC211008POA0

PENTAX DA 55-300mm F4-5.8 ED SMC Zoom Lens K mount Camera New Japan

SMC DCC-R-00-S7 CYLINDER CLAMP NEW


150-A16NC ALLEN BRADLEY SMC-2 SMART MOTOR CONTROLLER -- 1 YR RETURN POLICY


SMC Electro-pneumatic regulator ITV2011-31N3N4-DIH00161

SMC PROFIBUS EX121-SPR1 SOLENOID VALVE PROFIBUS-DP

SMC Pneumatic AHC Tool Changer MA321-YNM5


SMC CY1H15-R8679-700 ACTUATOR RODLESS CYLINDER 0.7 MPa MAX PRESSURE

SMC ACNL-X2-80X125-TA-P74GSC-X338 USPP ACNLX280X125TAP7

SMC CNATN63-1600-D NSPP CNATN631600D

IBM 44W4903 SMC10GXFP-LR Transceiver, SMC part number: SMC10GXFP-LR


SMC NCDY2S40H-0500-A80 USPP NCDY2S40H0500A80

SMC valve manifold and EX124U-SMJ1 CC-Link interface
Fitted 8 x VQ4200-5W valves, pneumatic automation PLC

SMC MGPL32N-150 COMPACT CYLINDER GUIDE 145PSI NEW*


SMC CDL1L100-G2828-350 NSFP CDL1L100G2828350

SMC MXQ25-75A USPP MXQ2575A

35 Gallon Aluminum Hydraulic Reservoir SMC35A

Pentax Q with SMC Pentax 8.5mm kit Black 16GB SDHC

Pentax Q with SMC Pentax 8.5mm kit White 16GB SDHC

SMC THERMO CONTROLLER DNS CIRCULATOR PUMP INR-244-404

SMC Cylinder Controller CEU2 AC100V

SMC MYC25-300H Guided Pneumatic Air Actuator Linear Stage CNC Robot

10pcs SMC type Pneumatic Parallel Gripper Double Acting MHZ2-16D

10pcs SMC type Pneumatic Parallel Gripper Double Acting MHZ2-16D

SMC MY1M40-320L NSFP MY1M40320L

TOTAL CONTROL SMC21100-8KOA-O SMART DISPLAY ***NIB***

SMC CDNADN80-100-D NSFP CDNADN80100D

smc PENTAX DA 21mm f/3.2 AL Limited Exc+

BRAND NEW Pentax Q with SMC Pentax 8.5mm kit White + 8GB SDHC + FEDEX

BRAND NEW Pentax Q with SMC Pentax 8.5mm kit Black + 8GB SDHC + FEDEX

SMC MQR2M5 NSPP MQR2M5





SMC MGGLB40-600 Guided Pneumatic Cylinder

SMC CDBXWM25-175 NSPP CDBXWM25175

SMC TMS40-C8916-250 PNEUMATIC CYLINDER *NS


Large Quantity New SMC CLKQ50 -15AA -DCI3555I Pnuematic Clamp

SMC MY1M25-100L-Z73 RODLESS CYL BORE 25mm STROKE 100mm

8 SMC 1/2" NPT 12V DC Electric Solenoid Valves & 4 Metering Mufflers Air Ride

SMC EX140-SDN1 NSFP EX140SDN1

Pentax Q with SMC Pentax 8.5mm kit Black ? 1 Yrs Warranty ? FEDEX

Pentax Q with SMC Pentax 8.5mm kit White ? 1 Yrs Warranty ? FEDEX

ALLEN BRADLEY 150-A09NB SMC-2 SMART MOTOR CONTROLLER 60 HZ 415 VAC 3 PH NIB


SMC C95N80-UA-DCH271BH LOCK UNIT/CYLINDER IMPA NEW*


SMC CA1KB63-G2223-XC10 (39+130) AIR CYLINDER 

SMC MXS2575B NSPP MXS2575B

BRAND NEW Pentax Q with SMC Pentax 8.5mm kit Black + FEDEX

BRAND NEW Pentax Q with SMC Pentax 8.5mm kit White + FEDEX

SMC CDG1UA50-150 USPP CDG1UA50150

smc PENTAX-DA 18-55mm F3.5-5.6 f/3.5-5.6 AL WR Lens K-mount NEW

1 NEW SMC CDPX2N2550A80S PNUEMATIC SLIDE CYLINDER NIB

SMC ITV2030-40N2S-X80 ELECTRONIC REGULATOR 1/4: 0.5MPA DEVICENET E/P NEW


Pentax 100mm f2.8 Macro AF SMC Pentax-FA Lens Used 1:1 auto focus K


smc PENTAX DA 21mm f/3.2 AL Limited Exc+

SMC CDBXWL25-50R-F7BVL NSPP CDBXWL2550RF7BVL

Livorsi Side Mount Controls SMCCH SMC CH SMCBCH SMCB 33C Mercury Yamaha Evinrude

SMC CYLINDER SLIDE TABLE MXQ16L-75-M9B NEW MXQ16L75M9B


SMC Cylinder POSTTTIONing Assembly

New SMC Cylinder CLADN63-400N-E-XC18 145 Psi 

SMC ROTARY TABLE MSQB20R-F9PL MSQB20R , 2-SENSORS D-F9P

Lot of 19 New SMC US33119-S50 PNEUMATIC CYLINDERS

SMC Rodless Acutator Slide NCDY2S40H-1000B 1000mm stroke

GLENTEK OMEGA SERIES SMC9915-1D-1 DIGIT. BRUSHLESS SERVO AMPLIFIER

Pentax FA SMC 1.4/50 mm #4230514

Pentax SMC-M 35/2 # 6341818 ...... Minty

Pentax SMC-M 35/2 # 6342583 ...... Minty

ALLEN BRADLEY 150-A35NA SMC2 MOTOR CONTROLLER NEW 

SMC CYLINDER CDS1GN125-650

SMC Digital Flow Switch w/ Display, PF2W704T-N03-27

SMC Digital Flow Switch for Water, PF2W720-04-27

SMC Pentax Zoom 16-45mm ED AL Lens For K-7 K-x K20D/New

SMC CYLINDER SLIDE TABLE ADJUSTABLE STROKE MXQ25L-10C NEW MXQ25L10C


SMC PNEUMATIC CYLINDER SLIDE TABLE MXQ25-10C NEW MXQ2510C


SMC MGF40-50 Pneumatic Low Profile Lift Table Air Cylinder Linear Actuator Drive


SMC CDNALN40-75-D TIE ROD CYLINDER W/ CNA40D-UA LOCK UNIT & JA40-14-150 JOINT

SMC PF2A703H-N10-29 DIGITAL FLOW SWITCH W/ INTEGRATED SENSOR 150-3000L/MIN

SMC Pneumatics Linear Actuator Table w/ MXS8's & 6's 

smc PENTAX DA 18-55mm F3.5-5.6 AL WR Lens

Pentax SMC FA 35mm 2.0 f2 f2.0 35/2 DSLR SLR Camera AF Prime Wide Angle Lens

SMC MXQ25-50F9BVL NSPP MXQ2550F9BVL

SMC PENTAX M 85mm f2 PK / K Lens For K30 K5 KR KM KX K1000 K2 MX LX ME Super etc

SMC SS5V1-F1L13 USPP SS5V1F1L13

SMC VVS8080-EP-X2 USPP VVS8080EPX2