The shock absorber consists of a reservoir 28 (pic. 75), cylinder 29, compression valve 32, rod 26 assembled with piston 31 and valves, clip 19 with guide sleeve 18 and sealing and fastening parts.
Pic. 75. Rear Suspension Shock Absorber:
1 - compression valve body; 2 - compression valve disks; 3 - throttle disk of the compression valve; 4 - compression valve plate; 5 - compression valve spring; 6 - clip of the compression valve; 7 - recoil valve nut; 8 - recoil valve spring; 9 - washer of the recoil valve nut; 10 - recoil valve plate; 11 - recoil valve disks; 12 - throttle disc of the recoil valve; 13 - piston; 14 - piston ring; 15 - bypass valve plate: 16 - bypass valve spring; 17 - restrictive plate of the bypass valve; 18 - guide bushing of the rod with a fluoroplastic layer; 19 - holder of the guide sleeve; 20 - tank sealing ring; 21 - stem gland; 22 - protective ring of the rod; 23 - stuffing box holder; 24 - tank nut; 25 - compression buffer support; 26 - shock absorber rod; 27 - spring cup; 28 - reservoir; 29 - cylinder; 30 - remote bushing; 31 - piston assembly with valves; 32 - compression valve assembly; 33 - shock absorber bushing assembly.
The tank 28 is made in the form of a pipe, to the lower part of which a bottom with an eye is welded, and an internal thread for the nut 24 is cut in the upper part. The lower support cup 27 of the suspension spring is welded to the tank from the outside.
The compression valve 32 is pressed onto the bottom of the cylinder and pressed against the bottom of the tank. It consists of a housing 1, a holder 6, a plate 4, a package of disks 2 and 3 and a spring 5. The housing has a central seat, against the chamfer of which the compression valve disks are pressed from above. In the upper and lower parts of the valve body there are cross-shaped cutouts for the passage of fluid. The disk package consists of four flat disks, one of which - the top one - has two cutouts for fluid throttling. The discs are pressed against the chamfer of the socket by a spring 5 through a plate 4, which has four through holes for the passage of liquid and a cylindrical protrusion. With this protrusion, the plate is pressed against the inner part of the throttle disc 3. Due to the cylindrical protrusion, a gap is formed between the outer edges of the throttle disc and the plate along the entire perimeter for the passage of fluid to the throttle cutouts of the disc. A clip 6 is pressed onto the valve body from above. It has a belt with a flare for fitting into the cylinder bore, one central and six peripheral holes for the passage of fluid.
In the cylinder 29 moves the rod 26 assembled with the piston 31 and two valves: bypass and return. The guide sleeve 18 has a fluoroplastic layer on the inner surface, due to which the wear of the rod and sleeve is sharply reduced. The holder 19 of the guide sleeve is pressed into the cylinder. The sleeve has a channel for draining fluid from the annular cavity of the cage into the cavity of the tank so that no pressure of the liquid is created on the stuffing box 21. The cage of the guide bushing is sealed in the tank with a rubber ring 20, which is pressed through the cage 23 of the stuffing box with a nut 24 to the belt of the cage 19 and the surface of the tank. With the same nut, through the stuffing box holder and the protective ring 22 of the rod, the stuffing box 21 is pressed against the annular protrusion of the guide sleeve holder.
The stuffing box 21 of the rod has three working edges, which are pressed against the chrome-plated surface of the rod. The grooves under the lower sealing edges are angled, whereby the fluid passing between the guide sleeve and the stem pressurizes the sealing lips against the stem surface, which improves the seal. Support 25 of the compression buffer is put on top of the shock absorber tank.
The following are installed in the lower part of the rod: distance sleeve 30, restrictive plate 17 of the bypass valve, spring 16 and plate 15 of the bypass valve, piston 13 with sealing ring 14, disks 11 and 12 of the recoil valve, thrust plate 10, spring 8 of the recoil valve and nut 7.
The distance sleeve 30 limits the movement of the rod during the recoil, abutting against the holder of the rod guide sleeve.
The piston 13 is ceramic-metal, has eight vertical channels located along circles of two radii. The channels located along a circumference of a larger radius are blocked from above by a plate 15 of the bypass valve, which is pressed against them by a flat spring 16. The remaining channels are blocked from below by a package of recoil valve disks. The upper disk 12 is throttle, it has four cutouts along the outer circumference; the next two discs 11 are flat. The pack of discs is pressed by spring 8 through support plate 10. The piston assembly with valves is fixed on the stem with nut 7, which is fixed by punching the end of the stem in two places. A washer 9 is installed between the nut and the lower disk of the recoil valve, which protects the disks from damage when screwing or unscrewing the nut. A ceramic-metal ring 14 serves to create a seal.
The operation of the shock absorber differs slightly from the operation of the telescopic strut, so this part of the section is omitted. Unlike the front suspension strut, the recoil stroke in the shock absorber is more severely limited by the stop of the spacer sleeve 30 in the holder 19 of the rod guide sleeve.