Ural (Урал) - Dnepr (Днепр) Russian Motorcycle. Part XIV: Plunger, Swing-Arm and Torsion Bar Evolution

Transcription

1 Ural (Урал) - Dnepr (Днепр) Russian Motorcycle Part XIV: Plunger, Swing-Arm and Torsion Bar Evolution ( Ernie Franke eafranke@tampabay.rr.com 09 / 2017

2 Swing-Arms and Torsion Bars for Heavy Russian Motorcycles with Sidecars Heavy Russian Motorcycle Rear-Wheel Swing-Arm Suspension Historical Evolution of Rear-Wheel Suspension Rear-Wheel Plunger Suspension Rear-Wheel Swing-Arm Suspension One-Wheel Drive (1WD) Rear-Drive Swing-Arm Two-Wheel Drive (2WD) Rear-Drive Swing-Arm Trans-Literated Terms Cornet: Splined Hub Journal: Shaft Stroller, Pram: Sidecar Rocker Arm: Between Sidecar Wheel Axle and Torsion Bar Swing-Arm Torsion Bar (Rod) Sway Bar: Mounting Rod Suspension Lever: Swing-Arm Swing Fork: Swing-Arm Not Covered: Front-Wheel Suspension Torsion Bar Sidecar Frames and Suspension Systems Historical Evolution of Sidecar Suspension Sidecar Rubber Bumper and Leaf-Spring Suspension Sidecar Torsion Bar Suspension Sidecar Swing-Arm Suspension Recent Advances in Ural Suspension Systems 2006: Nylock Nuts Used to Secure Final Drive to Swing-Arm 2007: Bottom-Out Travel Limiter on Sidecar Swing-Arm 2008: Ball Bearings Replace Silent-Block Bushings in Both Front and Rear Swing-Arms Heavy Russian motorcycle suspension started with the plunger (coiled spring) rear-wheel suspension on the M-72. This was replaced with the swing-arm (pendulum) and dual hydraulic shock absorbers on the K-750. Similarly the sidecar suspension was upgraded from the spring-leaf 2 to rubber isolators and a swing-arm approach in the M-72M.

3 Not Covered: Front-Wheel Torsion Bar 3

4 History of Rear-Wheel and Sidecar Wheel Suspension Rear-Wheel Suspension Original M-72 Suspension Plunger (Coiled-Spring) Rear-Wheel Suspension Ural s M-61 and M-62 Also Used Plunger Suspension System Upgrades to Rear-Wheel Suspension In 1958/9 Dnepr (KMZ) Introduced K-750, New Frame with Pendulum (Swing- Arm) Rear-Wheel Suspension and Coil-Spring Shock Absorbers In 1965 Ural (IMZ) Introduced M-63 (Ural-2), M-66, M-67 and which Transitioned from So-Called Candle-Frame of M-72/M-61/M-62 to New Bike Frame with Swing-Arm, Pendulum Rear-Wheel Suspension and Hydraulic Shock Absorbers Sidecar-Wheel Suspension Original M-72 Sidecar Suspension Steel Leaf Springs Until 1947, IMZ Did Not Let Sidecar Design Out of Gorky Plant Later Ural and Dnepr Used Swing-Arm Suspension and Rubber Blocks, Replacing Leaf-Springs In 1955 Ural (IMZ) Introduced M-72M with Sidecar-Wheel Torsion Bar Suspension Retained Steel Leaf-Springs Torsion Bar Mounted in Rear Cross-Member of Sidecar Frame M-72M, M-61, M-62 Had Torsion Bar on Sidecar Chinese-Built CJ750 (copy of M-72M) Has Torsion Bar Suspension Has Both Leaf-Springs and Torsion Bar In 1968/70 Ural (IMZ) Introduced M-63 (Ural-2), which Transitioned from Steel Leaf-Springs of M-72/M-61/M-62 to New Sidecar Frame with Swing-Arm, 4 Pendulum Sidecar-Wheel Suspension and Hydraulic Shock Absorbers

5 Time-Line of Plungers, Swing-Arms and Torsion Bars Mother of All Russian Sidecars: M-72 Production Ural M-61, M-62 Production Plunger Rear-Wheel, Torsion Bar on Sidecar Dnepr Introduced Swing-Arm Rear-Wheel with K-750 M-72 Minor Redesigned and Issued as M-72M, Torsion Bar Added to Sidecar Ural Introduced Swing-Arm Rear-Wheel with M-63 Ural M-63, M-66, M-67 Production, Swing-Arm Rear-Wheel and Hydraulic Shocks Dnepr MB-750 Dnepr MB-650 Dnepr MB-750M Taiga Sahara Ural M-63, M-66, M-67 Production, Swing-Arm Rear-Wheel and Hydraulic Shocks Dnepr MB-650 Dnepr MB-750M Dnepr MT-12 Dnepr MB-650M Ural 650cc Production, Swing-Arm Rear-Wheel and Hydraulic Shocks Dnepr MT-11, MT-16 Ural Sportsman Wjuga Ural Patrol (non-diff 2WD) Pustinja Raven Basic Ural Gear-Up (non-diff 2WD) Ural Patrol-T (non-diff 2WD) Heavy Russian motorcycle production began with the plunger rear-wheel and spring-leaf sidecar suspension. Demands for operation on 5 rough roads gave rise to swing-arms on both the rear-wheel and sidecar-wheel.

6 Ural (Урал) / Dnepr (Днепр) Sidecar Drive Train and Rear Suspension Ural (Урал) Model Production Drive Train Rear-Wheel Suspension Rear-Wheel Swing-Arm Sidecar Torsion Bar M Straight Final Drive (1WD) Plunger None (Plunger) None None M-72K Straight Final Drive (1WD) Plunger None (Plunger) None None M-72M Straight Final Drive (1WD) Plunger None (Plunger) None M Straight Final Drive (1WD) Plunger None (Plunger) None M-62 (Ural-1) Straight Final Drive (1WD) Plunger None (Plunger) None M-63 (Ural-2) Straight Final Drive (1WD) Swing-Arm Б (None Later) Sidecar Swing-Arm None ( Later) M-66 (Ural-3) Straight Final Drive (1WD) Swing-Arm Б None M-67 (IMZ-8.101) Straight Final Drive (1WD) Swing-Arm Б None M Straight Final Drive (1WD) Swing-Arm Б None Sportsman IMZ WD with non-locking Differential Swing-Arm IMZ None IMZ Series 650 1WD Straight Final Drive (1WD) Swing-Arm IMZ None IMZ Series 650 2WD WD with Engagable 2WD (No Diff) Swing-Arm IMZ None IMZ Б 750 Series 1WD 2003-Present Straight Final Drive (1WD) Swing-Arm IMZ None IMZ Series 2WD 2003-Present 1WD with Engagable 2WD (No Diff) Swing-Arm IMZ None IMZ Dnepr (Днепр) Model Production Drive Chain Rear Suspension Rear Swing-Arm Sidecar Torsion Bar M Straight Final Drive (1WD) Plunger None (Plunger) None None M-72N (H) Straight Final Drive (1WD) Plunger None (Plunger) None None K Straight Final Drive (1WD) Swing-Arm Б K-750M Straight Final Drive (1WD) Swing-Arm Б MT-12 (Dnepr-12) WD with Non-Locking Differential Swing-Arm ВП09800 None ВП50510 MB WD with Locking (Engagable) Diff Swing-Arm ВП09800 None ВП50510 MB-750M WD with Locking (Engagable) Diff Swing-Arm ВП09800 None ВП50510 Sidecar Swing-Arm K-650/MT Straight Final Drive (1WD) Swing-Arm None Б K-650/MT Straight Final Drive (1WD) Swing-Arm None Б MB WD with Locking Differential Swing-Arm ВП09800 None ВП50510 MB-650M WD with Non-Locking Differential Swing-Arm ВП09800 None ВП50510 MT Straight Final Drive (1WD) Swing-Arm None Б MT Straight Final Drive (1WD) Swing-Arm None Б MT-11 (Dnepr-11) Straight Final Drive (1WD) Swing-Arm None КМЗ MT-16 (Dnepr-16) WD with Non-Locking Differential Swing-Arm ВП09800 None ВП

7 Early Rear-Wheel Swing-Arm Suspension Every Ural and Dnepr Has Swing-Arm Suspension with Spring-Hydraulic Shock Absorbers Except for M-72, M-61 and M-62, with Rear-Wheel Plunger (Coil-Spring) Suspension In 1959 the Dnepr K-750 Appeared, Losing the Old Plunger Frame Design in Favor of a Swing-Arm Design, Giving More Suspension Travel and a Better Ride Over Rough Terrain M-72 Rear Suspension Motorcycle (Factory) Suspension Type Production M-72 (IMZ, KMZ) Plunger M-72K (IMZ) Plunger M-72M (IMZ) Plunger M-72N (KMZ) Plunger K-750 (KMZ) Swing-Arm K-750M (KMZ) Swing-Arm Ural M-61 (IMZ) Plunger Ural M-62 (IMZ) Plunger Ural M-63 (IMZ) Swing-Arm M-72 pioneered the plunger (coiled-spring) suspension, which was replaced 7 in the K-750. Ural s M-61 and M-62 also used the plunger suspension system.

8 1954 M-72 Rear-Wheel Suspension 1. Rear Fork Base Cap 2. Spring 3. Spring Housing 4. Right Suspension Support 5. Guide Sleeve 6. Bar 7. Buffer 8. Lock Screw 9. Absorber 10.Stuffing Box Motorcycle Frame Rear-Drive Motorcycle Frame Rear-Drive Motorcycle Frame Coiled-Spring Isolation between Motorcycle Frame and Rear-Drive Motorcycle Frame 1. End Caps of Rear Fork 2. Spring 3. Spring Housing 4. Right Suspension Support 5. Guide Sleeve 6. Bar 7. Buffer The M-72 had a plunger (coiled-spring) rear-wheel suspension. 8

9 Evolution from Plunger (M-72) to Swing-Arm (K-750) Rear-Wheel Suspension Plunger (Coiled-Spring) Suspension M-72 K-750 Swing-Arm Suspension with Spring/Hydraulic Shocks 9

10 M-72 Sidecar Frame Loop over Fender The M-72 Tub Is Suspended on Leaf-Springs Nearly all sidecars from the war vintage M-72 production have a rigid wheel suspension for the sidecar, as seen by a frame loop going over the top of the sidecar fender. This was also used on Chang Jiangs to about , when they added a torsion bar suspension.

11 Torsion Bar Suspension Torsion Bar Suspension, a.k.a. Torsion Spring Suspension, Uses a Torsion Bar as Its Main Weight-Bearing Spring Torsion Bar, the Elastic Absorber, Is a Metal Rod with Circular Splined Ends One End Is Firmly Attached to the Sidecar Chassis Opposite End Terminates in a Lever, Mounted Perpendicular to the Torsion Bar, that IsAttached to a Suspension Arm, Spindle oraxle (Rocker Arm) Vertical Motion of Sidecar Wheel Causes the Torsion Bar to Twist around Its Axis and Is Resisted by the Bar's Torsion Resistance, thus Achieving Elastic Coupling between the Sidecar Wheel and the Sidecar Body Torsion Feature Is that Rotation in Only One Direction - Towards Twisting Effective Spring Rate of the Torsion Bar Determined by Its Length, Shape, Material, Cross-Section and Manufacturing Process Another Feature: Torsion Bar Can Be Used to Adjust the Height of the Sidecar Torsion Bar with No Load Applied (Static) Sidecar Frame Torsion Bar with Wheel-Axle Load Applied Sidecar Frame Sidecar Wheel s Rocker Arm Sidecar Wheel s Rocker Arm Sidecar Wheel Axle Sidecar Wheel Axle 11

12 Sidecar Frames, Leaf-Springs and Torsion Bars Sidecar Frame Has Rigid, Reinforced, Double-Frame, Welded Tubular Construction Rectangular Frame Connected to Ball Clamps (3,23) and Two Adjustable Tie-Rods (9, 37) Brackets Welded at Rear of Sidecar Frame for Quarter-Elliptic Steel Leaf-Springs Sideacar Frame (11) Connected to Torsion Bar Suspension 1. Motorcycle Frame 3. Front Collet Chuck 4. Bolt Collet Fitting 9. Rear Tie-Rod Mounting Bar 11. Sidecar Frame 12. Spring 13. Spring Ladder 14. Lever Axle 15. Sidecar Wheel Axle 16. Wheel Protective Cap 22. Shoe Springs 23. Rear Collet Chuck 24. Idler Arm Rear Suspension 36. Adjusting Fork Rod 37. Front Tie-Rod Mounting Bar Torsion Bar Suspension of Sidecar-Wheel Ural M-63 Sidecar Wheel Axle 12

13 M-72M Torsion Bar Suspension on Sidecar-Wheel Sidecar Torsion Bar Cornet Part #: Splined Collet Firmly Anchored in Sidecar Frame Cross-Member M-72 Sidecar Torsion Bar and Cornets M-72 Sidecar Torsion Bar Cornet M-72 Sidecar-Wheel Rocker-Arm Other End of Torsion Bar Anchored in Splined Collet of Sidecar-Wheel Rocker-Arm Sidecar-Wheel Axle Ural (IMZ) introduced the torsion bar on the sidecar with the M-72M. It continued with the torsion bar from 1955 to 1965 with the M-61 and M-62, 13 abandoning it with the M-63 with swing-arm sidecar suspension.

14 K-750, M-61 and М-62 Sidecar-Wheel Torsion Bar (figure on next slide) Torsion Bar Suspension Consists of Torsion Shaft (Bar, Rod) Made of Special Spring Steel and Mounted Across the Sidecar Frame Torsion Wheel Suspension Mounted in Rear Cross Tube (4) of Sidecar Frame One End of Torsion Bar (5) Rigidly Fixed to Sidecar Frame Other End of Torsion Bar Fastened to Axis of Sidecar-Wheel Arm (Rocker-Arm) Torsion Bar (5) Is Splined on Each End for Insertion into Collet (Inner Sleeve) (15) Inner Sleeve (Collet) Is Splined and Firmly Attached to Sidecar Frame Tubing Axle of Rocker-Arm (3) Is Hollow with Internal Splines to Accept Torsion Bar Sidecar Wheel Moves Up-and-Down Relative to the Frame, Twisting Torsion Bar Vibrations Are Absorbed by Elasticity of Torsion Bar Movement of Lever Is Limited in the Vertical Plane by Bracket (9) Welded to the Right Longitudinal Tube of the Sidecar Frame Maximum Upward Blows on the Lever Arm Are Absorbed by Rubber Buffer (10), Attached to Limiter-Stop Bracket (9) 14

15 K-750, M-61 and М-62 Sidecar-Wheel Torsion Bar (cont.) Sidecar Torsion Bar and Cornets Sidecar-Wheel Rocker-Arm 9. Limiter Stop Limiter Range Sidecar-Wheel Rocker-Arm 1. Torsion Cap 2. Seal Clip 3. Axle of Lever Hub 4. Rear Tubing of Sidecar Frame 5. Torsion Bar (Rod) 6. Locking Screws 7. Claw-Clamp to Motorcyce Frame 8. Left Tube of Sidecar Frame 9. Travel Stop Arm 10. Rubber Buffer 11. Sidecar Wheel Axle 12. Axle Lever (Rocker-Arm) 13. Seal 14. Ring Seal Collet (Splined Inner Sleeve)

16 Rear and Sidecar Wheel Suspension ( cc Shop Manual) 1. Motorcycle Frame 2, 7. Adjusting Rods (front and rear) 3, 6. Collet Lower Frame Sidecar Mounting Points 4. Sidecar Frame 5. crank 1. Rear Suspension Swing-Arm 10. Collet Clamp 20. Sidecar Wheel Lever 2. Rear Mud Flap 11. Collet Clamp Screw 21. Brake Tie Rod 3. Rear Grab Bar 12. Motorcycle Stand 22. Brake Drum cover 4. Spring-Loaded Hydraulic Shock Absorber 13. Brake Pedal 23. Sidecar Wheel Axle 5. Seat (Saddle or Tractor) 14. Sidecar Wheel Brake Lever 24. Protective Hood 6. Strap 15. Sidecar Frame Legs 25. Tie Rod Nut 7. Motorcycle Frame 16. Sidecar Wheel Brake Rod 26. Sidecar Fender 8. Sidecar Adjusting Strut 17. Rear Collet Clamp Bracket 27. Rubber Body Suspension 9. Sidecar Frame Legs 18. Rear Bracket Fastening Bolt 28. Parking Brake 19. Lever Pins (Long Bolts) The rear-wheel is suspended on a trailing swing-arm, pivoting on rubber (silent-block) bushings located by removable pins in the frame and supported by dual hydraulic shocks/springs. The final drive attaches to the right-hand side of the swing-arm. The sidecar-wheel is carried on a forked, trailing-link swing-arm, supported by a single 16 hydraulic/shock/spring, pivoting in silent block bushings around long bolts ( lever pins ).

17 M-61 / K-750 Sidecar Frame (bike78.narod.ru) (figure on next slide) Sidecar Frame (Chassis) Welded Tubular Frame M-61 / K-750 Sidecar Frame Fastened to Motorcycle Frame at Four Points Two Ball Chucks (collets) at Bottom (to motorcycle frame) Two Bolted Connections at Top (front under tank and rear behind the saddle) Ball Joints on Motorcycle and Collets on Arms of Sidecar Frame Petal-Shaped Bowl Draws Ball into Socket Using Bolt Tie-Rods Adjustable in Length, Allow Alignment Relative to Motorcycle Sidecar Wheel Axle Resiliently Isolated from Frame by Torsion Bar / Rocker-Arm Swing-Arm Lever Pivots on Sleeve Bearing with Rubber-Metal Bushings (Silent-Blocks) Torsion Bar, Spring Shock Absorbers (like shock absorbers installed in rearwheel suspension), and Rubber Mounts Used for Isolation Torsion Bar Implementation Sidecar Wheel Axle (1) Mounted on Rocker-Arm (2) Torsion Bar (3) Twists as Rocker-Arm Moves Up-and-Down Ural M-61 Sidecar Dual Leaf-Springs Dnepr s K-750 Sidecar Has Rubber Isolators Instead of Leaf-Springs Sidecar Attachment Clamp Joint 1. Clamp (Collet or Claw) 2. Nut 3. Bolt 17 Sidecar Mounting Bar (Tie-Rod)

18 K-750 / M-61 Sidecar Torsion Bar Suspension and Frame (cont.) 7-Leaf Spring 1. Sidecar Wheel Axle 2. Lever Axle (Rocker-Arm) 3. Torsion Bar (Rod) 4. Locking Screws to Adjust Wheel Axle 5. Splined Hub (Cornet) M-61 Sidecar Frame 1. Connection Ball (Clam-Shell) 2. Connecting Rods 3. Sidecar Frame 4. Sidecar Fender 5. Sidecar Wheel Axle The rocker arm for the sidecar axle was isolated using a torsion bar mounted in the rear cross-member of the sidecar tubular frame. Ural s M-61 sidecar still retained the dual leaf-springs for suspension, 18 whereas Dnepr s K-750 used rubber bumpers plus the torsion bar.

19 Ural М-63 Frame and Sidecar (Рама и коляска) Frame Is Main Weight-Bearing Element All Components and Assemblies Are Attached Double, Tubular, Welded, Closed Type of Frame 1 - motorcycle frame 2 - front motor pin 3 - front collet chuck 4 - bolt collet 5 - motorcycle stand 6 - foot brake pedal 7 - step right driver 8 - supports clipboard 9 sidecar rod mounting frame 10 - passenger footrest 11 - sidecar frame 12 - spring 13 - spring clamp 14 - wheel axle lever 15 - sidecar wheel axle 16 - protective cap kit 17 - protective disc brake drum 18 buffer 19 sidecar fender Torsion Baron Sidecar Suspension 20 - turn lamp 21 - carrier body attachment 22 - shoe springs 23 - back collet chuck 24 - idler arm rear suspension 25 - shock absorber 26 - license plate bracket 27 - yoke back plate 28 - passenger seat 29 - passenger handle 30 - back plate 31 - driver's seat 32 - gas tank bracket 33 - left footrest Driver 34 - bracket motor 35 - rear motor hairpin 36 - adjusting fork rod 37 - sidecar rod mounting frame Sidecar frame is connected to the motorcycle frame thru collets. 3 and 23 and two rods (9 and 37). At the rear of the frame are welded brackets for the quarter-elliptic leaf springs. The sidecar wheel frame (11) is connected to the torsion bar suspension. To protect against contamination of 19 brake drums, the inner cavity is closed (17).

20 Ural М-63 Sidecar (коляска) Torsion Bar 1 - plug torsion 2 - gland (seal) 3 - hub axis of the lever 4 - rear frame tube 5 - torsion bar 6 - tightening bolts 7 - rear bracket collet connection 8 - left tube stroller frame 9 - stroke limiter control arm 10 - rubber buffer 11 - wheel axle 12 - lever of the wheel axle 13 - seal 14 gland (seal) ring 15 - lever pivot pin The torsion arm is mounted in the rear transverse frame tube (4). The torsion bar (5) has ends of small triangular splines for connecting the inner tube and the axis of the coupling arm (15). The inner sleeve has a slot-pipe hole and is welded to the frame tube. The axis arm (3) is hollow with internal splines. Outer surfaces polished lever pivot pin mounted in the hub axis (3). At the outer end of the shaft lever attached a woodruff key and bolted wheel axle lever (12). The hub axis of the arm is inserted into the back of the frame cross (transverse) tube and the flange is attached to the frame of the sidecar. Moving the lever wheel axis in the vertical plane is limited by the bracket (9) welded to the right of the longitudinal frame tube. Sharp fluctuations 20 are absorbed by the rubber buffer (10) attached to the bracket.

21 Mounting Rods or Sway Bars and Claw Fittings MB-750 MT-16, MB-650M and MB-650M1 MT-12 and K-650 Sidecar Attachment to Motorcycle 1. Front Tie Rod 2. Middle Tie Rod 3. Rear Clamp 4. Front Clamp Collet or Clamshell Sidecar Attachment Clamp Joint 1. Clamp (Collet or Claw) 2. Nut 3. Bolt Sidecar Claw Coupling Sidecar Mounting Bar 21

22 Dnepr 2WD Sidecar Transverse Drive Shaft Transverse Propshaft Sidecar Gear Reducer Transverse Propshaft With the tub removed, the sidecar drive shaft and gear reducer is clearly seen. 22

23 Ural M-63, M-66, M-67 Swing-Arm Frame 4 Holes for Mounting Swing-Arm Directly to 1WD Rear Drive Casing 1.Silent Block Pendulum Fork 2.Spacer 3.Plug 4.Bolt lower tip 5.Swingarm Rear Suspension Fork 6, 7. Threaded Bushing Assembly 8. Pendulum Fork Bolt 9. Washer 10, 11, 12, 13. Reinforcing Plate 14. Rubber Bushing 15. Frame 16. Spring Shock Absorber Because Ural s M-63 / M-66 / M-67 do not offer 2WD, the swing-arm is not C-shaped on the open end. 23

24 Ural M-63 (Ural-2) with Rear-Wheel, Swing-Arm Suspension The M-63 was the first Ural to use a rear-wheel, swing-arm suspension. 24 Unlike Dnepr (KMZ) bikes, the swing-arm is on the outside of the frame.

25 M-63 Suspension: Plunger, Torsion Bar or Swing-Arm? 1963 (Start of M-63 Production Line) Plunger (from M-62 Parts) Torsion Bar (No Swing-Arm) 1972 (End of M-63 Production Line) Swing-Arm (from M-63 Parts) Swing-Arm (No Torsion Bar ) As strange as it may seem, Ural changed motorcycle and sidecar suspension 25 in mid-stream. I m sure that never happened before!

26 Pining Down the Year of Change 1968 M-63 Swing-Arm Swing-Arm (No Torsion Bar ) 1970 M-63 Swing-Arm (No Torsion Bar ) Swing-Arm It appears that by 1968/70, Ural had instituted changing replacing the plunger with the swing-arm on the motorcycle and replacing the torsion bar with a swing-arm on the sidecar. 26

27 1WD versus 2WD Suspension of Rear Drive Swing-Arms Differ on the Drive Side 1WD Swing-Arm Has a Simple Plate Which Bolts to Four Studs around the Axle Hole of the Rear Drive Casing 2WD Swing-Arm Has a C-Shaped Fork Which Attaches to the Circumference Bolts on the Rear Drive Casing 2WD: C-Shaped Fork of Rear Drive Swing-Arm Gearboxes are also distinguished by the appearance and method of fastening 27 to an arm rear suspension.

28 MT-16 Rear Drive and Sidecar Wheel Gear Reducer (Ken Ulrich U-2 Cycles) Swing-Arm Suspension Differential rear Drive,Transverse Axle and Sidecar Gear Reducer Sidecar Pendulum Gear Reducer and Sidecar Wheel Brake Sidecar Pendulum Gear Reducer 2WD Swing-Arm Suspension 28

29 IMZ Tourist and IMZ Sportsman 1. Rear Suspension Swing-Arm 2. Rear Mud Guard 3. Rear Grab Bar 4. Spring-Loaded Hydraulic Shock Absorber 5. Seat (Tractor or Saddle) 6. Strap 7. Motorcycle Frame 8. Sidecar Adjusting Strut 9. Sidecar Frame Leg 10. Collet Clamp 11. Collet Clamp Screw 12. Motorcycle Stand 13. Brake Pedal 14. Sidecar Wheel Brake 15. Sidecar Frame Leg 16. Sidecar Wheel Brake Rod 17. Rear Collet Clamp Bracket 18. Rear Bracket Fastening Bolt 19. Lever Pins 20. Sidecar Wheel Lever 21. Brake Tie Rod 22. Brake Drum Cover 23. Sidecar Wheel Axle 24. Protective Hood 25. Tie Rod Nut 26. Sidecar Fender 27. Rubber Member of Body Suspension 28. Parking Brake The sidecar frame is coupled to the motorcycle frame through 29 collet clamps (10), rear collet clamp brackets (17) and two frame legs (9, 13).

30 Examining the Chang Jiang (CJ750) Motorcycle Chang Jiang (CJ750) Is Daughter of M-72 CJ750 Motorcycle and Sidecar Based on the 1956 Soviet IMZ (Irbitski Mototsikletniy Zavod) M-72, Which Was Derived from the 1938 German R71 In the USSR, Now That the Side-Valve (SV) Model Had Become Obsolete, Manufacture of the Old M72 Offered It to Their Chinese Neighbors In 1957, the M-72 IMZ Production Line Transferred to People s Republic of China (PRC) State-Owned, Gan Jiang Machinery Factory, and Renamed the Chang Jiang 750 Early Motorcycles Built Using Various Imported Russian Parts, and Even Some Complete Russian-Made M-72s Relabeled as CJ750 Side-Valve CJ750 Still In Production with Few Changes from Original Design Examining the Chang Jiang (CJ750) Helps to Understand the Modern M-72 Often the CJ750Drawings Are Copies of 1955 M-72 Drawings Chang Jiang 750 M1, CJ750 M1S (Super) and CJ750 M1M All Have Torsion Bar Suspension, Rocker Arm for the Sidecar Suspension and Plunger Rear Wheel Suspension CJ750 Sidecar Torsion Rod CJ750 Sidecar-Wheel Shaft Rocker Arm CJ750 Sidecar Springs 30

31 Chang Jiang (CJ750) Side-Wheel Axle Assembly (Sidecar-Wheel Shaft Rocker Arm) 1. Split Pin (Cotter Pin) 2. Castle Nut 3. Washer 4. Drum Cap 5. Rocker Arm 6. Torsion Rod 7. Side-Wheel Shaft 8. Screw 9. Washer 10. Rubber Buffer 11. Bolt 12. Plug 13. Locking Spring Ring 14. Nut 15. Tab Washer 16. Lip 17. Sealing Gasket 18. Felt Ring 19. Sealing Washer 20. Bushing 21. Fly Sleeve 22. Fly 23. Key 24. Bolt 25. Washer 26. Washer 27. Split Pin (Cotter Pin) Packing Felt Ring Sealing Washer The CJ750 diagram clearly shows the torsion bar in the 1951 version of the Russian M

32 1. Sidecar Frame 2. Side-Wheel Mudguard 3. Mudguard Middle Support 4. Nut 5. Spring Washer 6. Bolt 7. Anti-Shock Screw Shaft 8. Washer 9. Support 10. Fillet 11. Bush 12. Leaf Spring U-Bolts 13. Spacer 14. Spring Steel Plate 15. Anti-shock Shaft Bracket 16. Spacer 17. Rivet 18. Spring Washer 19. Nut 20. Bolt 21. Jaw Pipe Joint 22. Protective Plate 23. Nut 24. Spring Washer 25. Nut 26. Adjusting Screw 27. Split Pin 28. Bolt 29. Nut 30. Spring Washer 31. Rear Mounting Rod 32. Nut 33. Rear Mounting Screw 34. Lug 35. Spring Washer 36. Nut 37. Nut 38. Spring Washer 39. Joint for Mounting Rod 40. Front Mounting Rod 41. Anti-Shock Rubber 42. Front Mounting Screw 43. Bolt 44. Washer 45. Screw 46. Spring washer 47. Washer 48. Nut CJ750 Sidecar Frame Assembly The CJ750 sidecar frame assembly mimics the 1951 version of the Russian M

33 CJ750 Because it was a Chinese, we can see some of the old features of the M-72, including the sidecar. 33

34 1. Steering Bearing 2. Motorcycle Frame 3. Nut 4. Washer 5. Bolt 6. Fixing Bolt 7. Brake Rubber 8. Kick-Stand 9. Cotter Pin 10. Kick-Stand Support Shaft 11. Kick-Stand Washer 12. Kick-Stand Spring 13. Foot Pedal Rod 14. Foot Pedal Rod 15. Foot Pedal Rubber Sleeve 16. Battery Short Strap 17. Battery Long Strap 18. Battery Tightening Nut 19. Engine Body Link Support 20. Angle Iron 21. Clip 22. Rubber Spacer 23. Spacer 24. Nut 25. Screw 26. Spacer 27. Bolt 28. Washer 29. Nut 30. Nut 31. Washer 32. Bolt CJ750 Frame Assembly Attachment Points for Plungers 8-12 Kick-Stand Battery Holder Foot Pedal The CJ750 sidecar frame assembly clearly shows the attachment points 34 for the plunger suspension system.

35 M-72 Modeling ( Bracket for Sidecar Tub 7-Leaf Spring Original M-72 with Bar over Sidecar-Wheel Fender Plunger (Coil-Spring) Rear-Wheel Suspension Dual Spring-Leaf Suspension of the Tub Modeling of the old M-72 sidecar clearly shows the rigid frame over the fender. 35