CN115126813B

CN115126813B - Intelligent shock absorber of strong shock attenuation

Info

Publication number: CN115126813B
Application number: CN202211029561.5A
Authority: CN
Inventors: 安学成; 孙磊; 刘杰; 王永
Original assignee: Yangzhou Focus Shock Absorber Co ltd
Current assignee: Yangzhou Focus Shock Absorber Co ltd
Priority date: 2022-08-26
Filing date: 2022-08-26
Publication date: 2023-01-03
Anticipated expiration: 2042-08-26
Also published as: CN115126813A

Abstract

The invention relates to the field of shock absorber devices, and discloses a strong shock absorption intelligent shock absorber which comprises an outer cylinder and an inner cylinder, wherein the inner side of the outer cylinder is inserted with the inner cylinder in a sliding manner, a cylinder is inserted on the outer cylinder, a hanging ring II is fixedly arranged above the outer cylinder, one end of the cylinder, which is positioned in the inner cylinder, extends to the inner side of the inner cylinder, a piston system is arranged at the position, which is positioned in the inner side of the inner cylinder, of the cylinder, a control system is arranged at the bottom of the inner side of the inner cylinder, when the piston system rebounds, oil passes through a small hole five to extrude a clamping ring II, a telescopic rod I above the clamping ring II is compressed, meanwhile, the oil finally reaches the inner part of the small hole II from the small hole I through the small hole III, then the clamping disc I is extruded, and the impact of damping force is prevented through the clamping ring I, the clamping disc I, the clamping ring II and the clamping disc II, so that the buffering of the rebound of pressing can be realized, and the rebound buffering of the pressing rebound can be realized, and the problem that the existing shock absorption effect cannot be achieved or is unclear is solved when the oil quickly passes through the hole wall of the existing shock absorber.

Description

Intelligent shock absorber of strong shock attenuation

Technical Field

The present invention relates to the field of shock absorber devices. And more particularly, to a strong shock-absorbing intelligent shock absorber.

Background

The shock absorber is mainly used for inhibiting the shock when the spring absorbs the shock and rebounds and the impact from the road surface. When the road surface is uneven, although the shock-absorbing spring can filter the vibration of the road surface, the spring can still reciprocate, and the shock absorber is used for inhibiting the spring from jumping. The shock absorber is too soft, the vehicle body jumps up and down, and the shock absorber is too hard, so that too much resistance is brought, and the normal work of the spring is hindered. In a retrofit process for a suspension system, a stiff damper is used in conjunction with a stiff spring, which stiffness is related to vehicle weight, so that heavier vehicles typically use stiffer dampers. And a device connected with the vibration inducing crankshaft and used for resisting the torsional vibration of the crankshaft.

In order to improve the running smoothness of an automobile, a shock absorber is arranged in the suspension in parallel with the elastic element, and is used for attenuating shock. At the moment, the friction between the hole wall and oil and the internal friction between oil molecules form damping force on vibration, and then the damping force is absorbed by the shock absorber and is emitted into the atmosphere. When the cross section of the oil passage and other factors are not changed, the damping force is increased and decreased along with the relative movement speed between the vehicle frame and the vehicle axle (or the vehicle wheel), and is related to the viscosity of oil. When oil in the existing shock absorber quickly passes through the hole wall, the shock absorption effect can not be achieved or is not obvious.

Therefore, the intelligent shock absorber with strong shock absorption is designed for the situation.

Disclosure of Invention

The invention aims to provide a strong damping intelligent shock absorber to solve the problem that oil liquid in the existing shock absorber can not reach the damping effect or the damping effect is not obvious when the oil liquid rapidly passes through a hole wall in the background technology.

The utility model provides a strong intelligent bumper shock absorber of shock attenuation, includes urceolus and inner tube, the inboard slip of urceolus is pegged graft there is the inner tube, and it has the cylinder to peg graft on the urceolus, and the top fixed mounting that the cylinder is located the urceolus has rings two, and the cylinder is located the inside one end of inner tube inside and extends to the inboard of inner tube, and the position that the cylinder is located the inner tube inboard is provided with piston system, and fixed mounting has the intermediate layer drum in the inner tube, and the inboard bottom of inner tube is provided with control system.

Preferably, a fixing ring II is fixedly mounted on the outer wall of the outer barrel, a fixing ring I is fixedly mounted on the outer wall of the inner barrel, a spring V is connected between the fixing ring I and the fixing ring II, a fixing column is fixedly mounted below the inner barrel, and a hanging ring I is fixedly mounted below the fixing column.

Preferably, a separating ring is arranged between the inner cylinder and the interlayer cylinder, a connecting pipe is inserted below the separating ring on the interlayer cylinder, and the connecting pipe is communicated with the spaces on two sides of the interlayer cylinder.

Preferably, the piston system includes fixed block, middle piece, lower fixed block, joint ring one, ring and stationary blade, goes up fixed block fixed mounting on the cylinder, goes up the fixed grafting middle piece in the below of fixed block on the cylinder, and the fixed grafting lower fixed block in the below of middle piece on the cylinder, middle piece and lower fixed block fixed connection are in the same place, and the outside fixed mounting ring of middle piece goes up the below fixed mounting of fixed block and has spring three, and the below and the joint ring fixed connection of spring three are in the same place.

Preferably, the position of the outer side of the cylinder, which is located at the lower end, is fixedly installed together with the fixing sheet, a spring IV is fixedly installed on the fixing sheet, a movable ring is fixedly installed above the spring IV, a clamping disc I is fixedly installed on the outer side of the movable ring, and the movable ring is in sliding connection with the cylinder.

Preferably, two symmetrical first small holes are formed in the upper fixing block, two symmetrical third small holes are formed in the middle block, two symmetrical fourth small holes are formed in the circular ring, two symmetrical second small holes are formed in the lower fixing block, the first small holes, the second small holes and the third small holes are communicated, a clamping disc I is arranged below the second small holes, and a clamping ring I is arranged on the fourth small holes.

Preferably, the control system comprises a first limiting plate, a first disc, a middle disc, a second clamping disc and a second limiting plate, the middle disc is fixedly mounted on the inner wall of the lower side of the interlayer cylinder, a first telescopic rod is fixedly mounted on the middle disc, the disc is movably sleeved on the first telescopic rod, the first telescopic rod is fixedly connected with the first limiting plate, a first spring is sleeved on the outer side of the first telescopic rod, the upper end and the lower end of the first spring are fixedly connected with the first limiting plate and the disc respectively, the lower side of the middle disc is fixedly connected with the second clamping disc, a second telescopic rod is fixedly mounted on the lower side of the second clamping disc, the second telescopic rod is fixedly connected with the second limiting plate, and the second limiting plate is fixedly connected with the inner wall of the bottom of the inner cylinder.

Preferably, four connecting columns are fixedly mounted on the outer side of the disc, and the outer sides of the four connecting columns are connected with a clamping ring II.

Preferably, the middle disc is provided with two symmetrical small holes six, a small hole five is formed in the outer side of the two small holes six on the middle disc, the clamping ring two is located above the small hole five, and the clamping disc two is located below the small hole six.

Compared with the prior art, the invention has the advantages that:

1. when the cylinder is pressed down, oil is arranged on the inner side of the interlayer cylinder in the inner cylinder, the oil extrudes the clamping ring I upwards through the small hole four directions, the spring III can elastically deform, a gap is formed between the clamping ring I and the top of the small hole IV, the oil flows upwards through the gap between the clamping ring I and the small hole IV, along with the downward movement of the piston system, the position pressure close to the bottom in the interlayer cylinder is increased, namely the pressure above the control system is increased, the oil has pressure for the clamping disc II through the small hole six, the spring IV is extruded by the clamping disc II, therefore, the gap is formed between the clamping disc II and the bottom end of the small hole six, the oil can reach the position below the clamping disc II through the gap between the clamping disc II and the small hole six, finally enters the space between the interlayer cylinder and the inner cylinder through the connecting pipe, and the extrusion separation ring is upward. The nitrogen is arranged above the separating ring and can be compressed and amplified, so that the buffer effect can be realized when the nitrogen is pressed down, and oil is prevented from rapidly passing through the small holes. The shock absorber solves the problem that when an existing shock absorber is pressed down, oil can quickly pass through a hole wall, and the shock absorption effect can not be achieved or is not obvious.

2. When the piston system rebounds, the pressure at the lower part of the interlayer cylinder is reduced, nitrogen above the separation ring can extrude the separation ring, oil below the separation ring flows to the lower part of the intermediate disc through the connecting pipe, the oil extrudes the clamping ring II through the small hole five, the telescopic rod I above the clamping ring II is compressed, a gap is formed between the clamping ring II and the intermediate disc, the oil flows out from the gap between the clamping ring II and the intermediate disc through the small hole five, meanwhile, the oil finally reaches the inner part of the small hole II through the small hole III from the small hole I, then the clamping disc I is extruded, the oil flows into the lower part of the piston system through the gap between the lower fixing block and the clamping disc I, and the impact of damping force is achieved through the clamping ring I, the clamping disc I, the clamping ring II and the clamping disc II, so that the buffering effect can be achieved when the shock absorber rebounds, the fast oil is prevented from passing through the small hole, and the problem that the shock absorbing effect cannot be achieved or the shock absorbing effect is not obvious when the existing shock absorber rebounds is solved.

Drawings

FIG. 1 is a cross-sectional view of the overall construction of the present invention;

FIG. 2 is a perspective view of the overall structure of the present invention;

FIG. 3 is a perspective view of the inside of the outer tube in the present invention;

FIG. 4 is a perspective view of the interior of the inner barrel of the present invention;

FIG. 5 is an exploded view of the control system of the present invention;

FIG. 6 is a first schematic view of a piston system of the present invention;

FIG. 7 is a second schematic view of a piston system of the present invention;

FIG. 8 is a schematic view of the inside of the outer tub in the present invention.

The reference numbers in the figures illustrate: 1. an outer cylinder; 2. an inner barrel; 3. fixing a column; 4. a first hanging ring; 5. a second hanging ring; 6. a cylinder; 7. an upper fixed block; 8. a middle block; 9. a lower fixing block; 10. a sandwiched cylinder; 11. a first limiting sheet; 12. a connecting pipe; 13. a spacer ring; 14. a third spring; 15. a clamping ring I; 16. a circular ring; 17. a fixing sheet; 18. a fourth spring; 19. a first spring; 20. a second clamping ring; 21. an intermediate tray; 22. a fifth small hole; 23. a second clamping disc; 24. a second spring; 25. a second limiting sheet; 26. connecting columns; 27. a disc; 28. a first small hole; 29. a second small hole; 30. a first clamping disc; 31. a third small hole; 32. a fourth small hole; 33. a movable ring; 34. a first telescopic rod; 35. a second telescopic rod; 36. sixthly, forming small holes; 37. a first fixing ring; 38. a fifth spring; 39. and a second fixing ring.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-8, the present invention provides a technical solution: the utility model provides a strong intelligent bumper shock absorber of shock attenuation, including urceolus 1 and inner tube 2, the inboard slip of urceolus 1 is pegged graft and is had inner tube 2, it has cylinder 6 to peg graft on the urceolus 1, cylinder 6 is located the top fixed mounting of urceolus 1 has rings two 5, cylinder 6 is located the inboard that the inside one end of inner tube 2 extends to inner tube 2, cylinder 6 is located the inboard position of inner tube 2 and is provided with piston system, inner tube 2 internal fixation has intermediate layer drum 10, the inboard bottom of inner tube 2 is provided with control system. Can realize pushing down the buffering of resilience through piston system and control system to solve oil liquid in the current bumper shock absorber and pass through the valve fast, often can not reach the shock attenuation effect or the shock attenuation effect is obscure problem.

Further, a fixing ring II 39 is fixedly mounted on the outer wall of the outer cylinder 1, a fixing ring I37 is fixedly mounted on the outer wall of the inner cylinder 2, a spring V38 is connected between the fixing ring I37 and the fixing ring II 39, a fixing column 3 is fixedly mounted below the inner cylinder 2, and a hanging ring I4 is fixedly mounted below the fixing column 3.

Furthermore, a separating ring 13 is arranged between the inner cylinder 2 and the interlayer cylinder 10, a connecting pipe 12 is inserted below the separating ring 13 on the interlayer cylinder 10, and the connecting pipe 12 is communicated with the two side spaces of the interlayer cylinder 10. When the cylinder 6 is pressed downwards, oil finally enters between the interlayer cylinder 10 and the inner cylinder 2 through the connecting pipe 12, and the separating ring 13 is pressed upwards. Nitrogen is provided above the separation ring 13, and can be compressed and amplified, when the piston system rebounds, the pressure at the lower part of the sandwich cylinder 10 becomes smaller, the nitrogen above the separation ring 13 will squeeze the separation ring 13, and the oil below the separation ring 13 flows to the lower part of the intermediate disc 21 through the connecting pipe 12.

Further, the piston system includes last fixed block 7, middle piece 8, lower fixed block 9, joint ring one 15, ring 16 and stationary blade 17, go up fixed block 7 fixed mounting on cylinder 6, cylinder 6 goes up the fixed grafting middle piece 8 in below of fixed block 7, cylinder 6 goes up the fixed grafting lower fixed block 9 in below of middle piece 8, middle piece 8 is in the same place with lower fixed block 9 fixed connection, the outside fixed mounting ring 16 of middle piece 8, the below fixed mounting of going up fixed block 7 has spring three 14, the below and the joint ring one 15 fixed connection of spring three 14 are in the same place.

Furthermore, the position of the outer side of the column 6, which is located at the lower end, is fixedly installed together with the fixing plate 17, a spring IV 18 is fixedly installed on the fixing plate 17, a movable ring 33 is fixedly installed above the spring IV 18, a clamping disc I30 is fixedly installed on the outer side of the movable ring 33, and the movable ring 33 is slidably connected with the column 6. When the spring IV 18 is in a natural state, the first clamping disc 30 is attached to the lower end of the lower fixing block 9, and when the spring IV is in a compressed state, the first clamping disc 30 is separated from the lower fixing block 9.

Furthermore, two symmetrical small holes I28 are formed in the upper fixing block 7, two symmetrical small holes III 31 are formed in the middle block 8, two symmetrical small holes IV 32 are formed in the circular ring 16, two symmetrical small holes II 29 are formed in the lower fixing block 9, the small holes I28 and II 29 are communicated with the small holes III 31, a clamping disc I30 is arranged below the small holes II 29, and a clamping ring I15 is arranged on the small holes IV 32. When the cylinder 6 is pressed downwards, oil is arranged on the inner side, located on the interlayer cylinder 10, of the inner cylinder 2, the oil upwards extrudes the clamping ring I15 through the small hole IV 32, elastic deformation can occur due to the spring III 14, a gap is formed between the clamping ring I15 and the top of the small hole IV 32, the oil upwards flows through the gap between the clamping ring I15 and the small hole IV 32, when the piston system rebounds, the oil finally arrives inside the small hole II 29 through the small hole III 31 from the small hole I28, then the clamping disc I30 is extruded, the oil flows into the lower portion of the piston system through the gap between the lower fixing block 9 and the clamping disc I30, and the problem that the damping effect cannot be achieved or the damping effect is not obvious due to the fact that the oil quickly passes through the hole wall when the shock absorber is pressed downwards and rebounded is solved.

Further, the control system comprises a first limiting piece 11, a first disc 27, a middle disc 21, a second clamping disc 23 and a second limiting piece 25, the middle disc 21 is fixedly installed on the inner wall of the lower side of the interlayer cylinder 10, a first telescopic rod 34 is fixedly installed on the middle disc 21, the disc 27 is movably sleeved on the first telescopic rod 34, the first telescopic rod 34 is fixedly connected with the first limiting piece 11, a first spring 19 is sleeved on the outer side of the first telescopic rod 34, the upper end and the lower end of the first spring 19 are fixedly connected with the first limiting piece 11 and the disc 27 respectively, the lower portion of the middle disc 21 is fixedly connected with the second clamping disc 23, a second telescopic rod 35 is fixedly installed below the second clamping disc 23, the second telescopic rod 35 is fixedly connected with the second limiting piece 25, and the second limiting piece 25 is fixedly connected with the inner wall of the bottom of the inner cylinder 2. When the cylinder 6 is pressed downwards, oil has pressure on the second clamping disk 23 through the sixth small hole 36, the fourth spring 18 is extruded by the second clamping disk 23, so that a gap is reserved between the second clamping disk 23 and the bottom end of the sixth small hole 36, the oil can reach the position below the second clamping disk 23 through the gap between the second clamping disk 23 and the sixth small hole 36, when the piston system rebounds, the oil extrudes the second clamping ring 20 through the fifth small hole 22, the first telescopic rod 34 above the second clamping ring 20 is compressed, a gap is reserved between the second clamping ring 20 and the middle disk 21, and the oil flows out from the gap between the second clamping ring 20 and the middle disk 21 through the fifth small hole 22. The problem that the shock absorption effect cannot be achieved or the shock absorption effect is not obvious due to the fact that oil rapidly passes through the hole wall when the shock absorber is pressed downwards and rebounded is solved.

Furthermore, four connecting columns 26 are fixedly mounted on the outer side of the circular disc 27, and the outer sides of the four connecting columns 26 are connected with a second clamping ring 20. Four connecting columns 26 are fixedly arranged on the outer side of the disc 27, and the connecting columns 26 can be connected with the disc 27 and the second clamping ring 20, so that oil can pass through the small holes six 36 from the upper part to the lower part.

Furthermore, two symmetrical small holes six 36 are formed in the middle disc 21, a small hole five 22 is formed in the middle disc 21 and located on the outer side of the two small holes six 36, the second clamping ring 20 is located above the small hole five 22, and the second clamping disc 23 is located below the small hole six 36.

The working principle is as follows:

when the cylinder 6 is pressed downwards, oil is arranged inside the inner cylinder 2 and located on the inner side of the interlayer cylinder 10, the oil upwards extrudes the first clamping ring 15 through the fourth small hole 32, due to the fact that the third spring 14 can elastically deform, a gap is formed between the first clamping ring 15 and the top of the fourth small hole 32, the oil upwards flows through the gap between the first clamping ring 15 and the fourth small hole 32, along with the downward movement of the piston system, the pressure of the position, close to the bottom, inside the interlayer cylinder 10 is increased, namely the pressure above the control system is increased, the oil exerts pressure on the second clamping disc 23 through the sixth small hole 36, the fourth spring 18 is extruded by the second clamping disc 23, therefore, a gap is formed between the second clamping disc 23 and the sixth small hole 36, the oil can abut against the lower portion of the second clamping disc 23 through the gap between the second clamping disc 23 and the sixth small hole 36, finally enters the interlayer cylinder 10 and the inner cylinder 2 through the connecting pipe 12, and the separating ring 13 is extruded upwards. Nitrogen is arranged above the separating ring 13 and can be compressed and amplified, when the piston system rebounds, the pressure at the lower part of the interlayer cylinder 10 becomes small, the nitrogen above the separating ring 13 can extrude the separating ring 13, oil below the separating ring 13 flows to the lower part of the intermediate disc 21 through the connecting pipe 12, the oil extrudes the clamping ring II 20 through the small hole five 22, the telescopic rod I34 above the clamping ring II 20 is compressed, a gap is formed between the clamping ring II 20 and the intermediate disc 21, the oil flows out from the gap between the clamping ring II 20 and the intermediate disc 21 through the small hole five 22, meanwhile, the oil finally reaches the inner part of the small hole II 29 through the small hole III 31 from the small hole I28 and then extrudes the clamping disc I30, the oil flows into the lower part of the piston system through the gap between the lower fixing block 9 and the clamping disc I30, and the damping effect cannot be achieved through the clamping ring I15, the clamping disc I30, the clamping ring II 20 and the clamping disc II 23, the impact of the damping force on the downward pressing and rebound can be buffered, and the rebound can be achieved, and the problem that the oil in the existing damper can not achieve the damping effect of damping through the quick passing of the damping of the existing damper generally.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a strong intelligent bumper shock absorber of shock attenuation, includes urceolus (1) and inner tube (2), its characterized in that: the inner side of the outer cylinder (1) is slidably inserted with the inner cylinder (2), the outer cylinder (1) is inserted with a cylinder (6), a lifting ring II (5) is fixedly arranged above the outer cylinder (1) of the cylinder (6), one end of the cylinder (6) positioned in the inner cylinder (2) extends to the inner side of the inner cylinder (2), a piston system is arranged at the position of the cylinder (6) positioned in the inner side of the inner cylinder (2), an interlayer cylinder (10) is fixedly arranged in the inner cylinder (2), and a control system is arranged at the bottom of the inner side of the inner cylinder (2);

the piston system comprises an upper fixing block (7), a middle block (8), a lower fixing block (9), a clamping ring I (15), a ring (16) and a fixing piece (17), wherein the upper fixing block (7) is fixedly installed on the cylinder (6), the middle block (8) is fixedly inserted and connected below the upper fixing block (7) on the cylinder (6), the lower fixing block (9) is fixedly inserted and connected below the middle block (8) on the cylinder (6), the middle block (8) and the lower fixing block (9) are fixedly connected together, the ring (16) is fixedly installed on the outer side of the middle block (8), a spring III (14) is fixedly installed below the upper fixing block (7), and the lower part of the spring III (14) and the clamping ring I (15) are fixedly connected together;

the outer side of the cylinder (6) is positioned at the lower end and is fixedly installed together with the fixing piece (17), the fixing piece (17) is fixedly provided with a spring IV (18), a movable ring (33) is fixedly installed above the spring IV (18), the outer side of the movable ring (33) is fixedly provided with a clamping disc I (30), the movable ring (33) is in sliding connection with the cylinder (6), and the clamping disc I (30) is attached to the lower end of the lower fixing block (9);

two symmetrical small holes I (28) are formed in the upper fixing block (7), two symmetrical small holes III (31) are formed in the middle block (8), two symmetrical small holes IV (32) are formed in the circular ring (16), two symmetrical small holes II (29) are formed in the lower fixing block (9), the small holes I (28), the small holes II (29) are communicated with the small holes III (31), a clamping disc I (30) is arranged below the small holes II (29), and a clamping ring I (15) is arranged on the small holes IV (32).

2. The intelligent shock absorber with strong shock absorption function as claimed in claim 1, wherein: the outer wall of outer tube (1) is fixedly mounted with a second fixing ring (39), the outer wall of inner tube (2) is fixedly mounted with a first fixing ring (37), a fifth spring (38) is connected between the first fixing ring (37) and the second fixing ring (39), the lower portion of inner tube (2) is fixedly mounted with a fixing column (3), and the lower portion of fixing column (3) is fixedly mounted with a first hanging ring (4).

3. The intelligent shock absorber with strong shock absorption function as claimed in claim 1, wherein: a separating ring (13) is arranged between the inner cylinder (2) and the interlayer cylinder (10), a connecting pipe (12) is inserted below the separating ring (13) on the interlayer cylinder (10), and the connecting pipe (12) is communicated with the spaces on two sides of the interlayer cylinder (10).

4. The intelligent shock absorber with strong shock absorption function as claimed in claim 1, wherein: the control system comprises a first limiting piece (11), a disc (27), a middle disc (21), a second clamping disc (23) and a second limiting piece (25), the middle disc (21) is fixedly installed on the inner wall of the lower side of the interlayer cylinder (10), a first telescopic rod (34) is fixedly installed on the middle disc (21), the disc (27) is movably sleeved on the first telescopic rod (34), the first telescopic rod (34) is fixedly connected with the first limiting piece (11), a first spring (19) is sleeved on the outer side of the first telescopic rod (34), the upper end and the lower end of the first spring (19) are fixedly connected with the first limiting piece (11) and the disc (27) respectively, the lower portion of the middle disc (21) is fixedly connected with the second clamping disc (23), a second telescopic rod (35) is fixedly installed below the second clamping disc (23), the second telescopic rod (35) is fixedly connected with the second limiting piece (25), and the second limiting piece (25) is fixedly connected with the inner wall of the bottom of the inner cylinder (2).

5. The smart shock absorber of claim 4, wherein: the outer side of the disc (27) is fixedly provided with four connecting columns (26), and the outer sides of the four connecting columns (26) are connected with a clamping ring II (20) together.

6. The smart shock absorber of claim 4, wherein: two symmetrical small holes six (36) are formed in the middle disc (21), a small hole five (22) is formed in the outer side, located on the two small holes six (36), of the middle disc (21), the clamping ring two (20) is located above the small hole five (22), and the clamping disc two (23) is located below the small holes six (36).