TWM449752U - Bicycle seat post structure - Google Patents

Description

Bicycle seat post structure

The present invention relates to a bicycle seat post structure, especially a bicycle seat cushion structure in which the seat cushion cannot be pulled up or down after the seat height is set.

Press, the bicycle seat post is attached to the bottom end of the seat cushion to fix the seat cushion support on the frame. The top of the seat post is fixed to the bottom end of the seat cushion, and the bottom end is internally and externally connected and fixed to the riser of the frame. The structure of the cushion column is mainly of the "mechanical" and "oily" configurations. The "mechanical" is the application mechanism to adjust the relative position of the inner and outer tubes of the seat to adjust the height of the seat; "hydraulic" The oil pressure of the hydraulic member is used to adjust the relative position of the inner and outer tubes of the seat post to adjust the height of the seat cushion. The structure of the "oil pressure" cushion column is as disclosed in Taiwan Application No. 089221346, No. 097206782 and No. 099137166. The structure of the conventional hydraulic seat cushion is an actuator that is located inside the seat cushion, and a valve seat that is axially displaced by a floating piston and a striker in the oil pressure tank, and is located at a position The oil chamber between the floating piston and the valve seat, and the lower oil chamber located below the valve seat, and the air chamber above the floating piston. When the conventional hydraulic seat cushion is used, when the height of the seat cushion has been adjusted and the striker is locked, the oil in the upper and lower oil chambers cannot be communicated, because the oil chamber is full of oil, so that the seat cushion can no longer move down. fixed. However, the upper part of the floating piston is a gas chamber, so that if the user pulls up the cushion, the needle and the valve seat will still compress the air in the air chamber. As the seat cushion moves up a stroke, the hand cushion is lifted up, and the seat cushion and the frame will be lifted. There is a sliding distance. For the user, there will be a cushion and the frame are not integrated, and the hand-held cushion pushes the frame up. At the beginning, the cushion and the frame will have a sense of separation. In view of this, the creator has made design improvements and has created this creation.

Therefore, the main creative purpose of this creation is to provide a bicycle seat post structure in which the seat cushion is locked and the seat cushion can no longer be pressed or pulled up to form the seat cushion and the frame.

Referring to the first figure, the seat string of the present invention is an inner tube 2 which penetrates an outer tube 1 and a bottom end into the outer tube 1 and a hydraulic pressure which is inserted into the inner and outer tubes 2 and 1. Actuator 3. among them,
The outer tube 1 has a bottom end that is fixed into the riser 4 of the bicycle frame.
The inner tube 2 is fixed with a clamp 20 at the top end for clamping and fixing the fixed cross rod at the bottom end of the seat cushion.
The hydraulic actuator 3, as shown in the second to eighth figures, has an upper cylinder 30, a middle cylinder 31, a lower cylinder 32, and a striker 33 that is inserted into the intermediate cylinder 31. The intermediate cylinder 31 is interposed between the upper and lower cylinders 30 and 32, and both ends penetrate the inside of the upper and lower cylinders 30 and 32, respectively. The upper and lower end barrels of the upper cylinder 30 are respectively screwed with a metal material and a hollow upper sealing plug 301 and a lower sealing plug 302 (as shown in the third to sixth figures). The top outer wall 3010 of the upper sealing plug 301 is located outside the barrel opening of the upper cylinder 30, and the top outer wall 3010 has a thread and a screw on the inner wall of the inner tube 2 (as shown in the first figure). The top of the cylinder 30 is fixed. A socket 303 (shown in Figures 3 and 6) is disposed on the inner side of the top end of the upper cylinder 30. The top end of the socket 303 has a concave receiving section 3030 with a through hole 3031 in the middle. The outer wall of the top end of the socket 303 and the inner wall of the upper sealing plug 301 are screwed and fixed by a screw surface 3032. The inner wall of the bottom end of the socket 303 and the outer wall of the top end of the middle cylinder 31 are also screwed with a screw surface 3033. The upper cylinder 30, the upper sealing plug 301, the socket 303 and the intermediate cylinder 31 are integrated (as shown in FIGS. 5 and 6). The top end of the striker 33 extends into the receiving section 3030 of the socket 303 and locks an upper striker 330. The top end of the upper striker 330 extends through the hollow position of the upper sealing plug 301. An upper spring 34 is disposed in the receiving portion 3030 of the socket 303. The upper spring 34 is located between the outer wall of the top end of the striker 33 and the inner wall of the receiving portion 3030, and the top end of the upper spring 34 is fixed to the top end shoulder 331 of the striker 33. The bottom end of the upper spring 34 abuts against the bottom surface of the receiving portion 3030 of the socket 303, so that the upper spring 34 has a pushing force of the pushing pin 33 and the upper striker 330 upward. A floating piston 35 (shown in FIG. 6) is disposed on the outer side of the middle cylinder 31 on the inner side of the upper cylinder 30, and the inner cylinder 30 between the floating oil plug 35 and the lower sealing plug 302 is separated by an oil. The chamber 36 has an air chamber 37 in the interior of the upper cylinder 30 between the floating piston 35 and the upper sealing plug 301. The middle cylinder barrel 31 is located on the wall of the barrel below the floating piston 35, and has an oil hole 310. The outer wall surface of the striker 33 located above the oil hole 310 is attached to the barrel wall of the middle cylinder barrel 31 by the oil ring 311, causing oil. An oil passage 312 is formed between the outer wall of the striker 33 below the ring 311 and the inner wall of the middle cylinder 31. The oil passage 312 communicates with the oiling chamber 36 through the oil hole 310. The oil passage 312 is also a part of the oil chamber 36.
The bottom end of the striker 33 and the intermediate cylinder 31 extends into the inner end of the lower cylinder 32, as shown in the second, third, seventh and eighth figures. The upper and lower end barrels of the lower cylinder 32 respectively screw the other upper sealing plug 320 and the lower sealing plug 321 to seal the upper and lower end barrels of the lower cylinder 32. Wherein, the upper plug 320 has a perforation in the middle, and the bottom end of the middle cylinder 31 can be inserted into the lower cylinder 32. The middle cylinder 31 is screwed to a hollow valve seat 38 at the bottom end of the lower cylinder 32. The outer wall of the valve seat 38 is in contact with the inner wall of the lower cylinder 32 by an oil ring 380. The inner side of the valve seat 38 is fixedly connected with a striker 332 and a striker 33. The lower end of the lower striker 332 is fixed with a lower valve piece 381. The outer edge of the lower valve piece 381 is an outer inclined surface 3810, and the bottom end of the valve seat 38 The hollow port corresponds to the inner wall of the outer inclined surface 3810, and has an inner inclined surface 3800. When the inner and outer inclined surfaces 3800 and 3810 are fitted to each other, the space of the lower cylinder 32 below the lower valve piece 381 is partitioned into a lower oil chamber 39. . The bottom end of the striker 33 has an outer diameter reducing section 333. The outer side of the diameter reducing section 333 is sleeved with an upper valve piece 382. The outer edge of the upper valve piece 382 has an outer inclined surface 3820, and the middle cylinder barrel 331 The bottom inner edge corresponds to the outer bevel 3820 with an inner bevel 313. The lower striker 332 under the upper valve piece 382 is externally sleeved with a lower spring 40. The top end of the lower spring 40 is in contact with the bottom end of the upper valve piece 382. The bottom end of the lower spring 40 is placed on a flat surface of the lower striker 332. The lower spring 40 has a force pushing up the upper valve plate 382 upward, so that the outer inclined surface 3820 of the upper valve piece 382 is in close contact with the inner inner inclined surface 313 of the middle cylinder barrel 31. The outer wall of the valve seat 38 located below the upper valve plate 382 has a valve hole 384 that communicates the inside and the outside of the valve seat 38. An oil chamber 41 is disposed between the outer wall of the valve seat 38 and the inner wall of the lower cylinder 32, and the medium oil chamber 41 communicates with the interior of the valve seat 38 through the valve hole 384.
After assembling the upper cushion column on the riser of the bicycle frame, the adjustment action of adjusting the height of the seat cushion is as follows:
1. As shown in the ninth and tenth figures, the control of a cam adjusting button pushes the upper striker 330, the striker 33 and the lower striker 332 of the hydraulic actuator 3 downward, and the position of the seat cushion can be adjusted at this time. When the striker 33 is pressed down, the upper spring 34 is compressed and moved downward, and the lower striker 332, the upper valve piece 382, and the lower valve piece 381 which are integrally interlocked with the striker 33 are simultaneously moved downward, and the upper and lower valve pieces 382 and 381 are respectively separated. The inner inclined surface 313 of the intermediate cylinder 31 and the inner inclined surface 3800 of the valve seat 38 (as shown in FIG. 11) connect the oiling chamber 36, the intermediate oil chamber 41 and the lower oil chamber 39, so that the upper cylinder can be connected. The height adjustment position of the barrel 30, the middle cylinder barrel 31, the striker 33, the valve seat 38 and the seat cushion are integrally adjusted, and the total oil quantity in the three oil chambers is adjusted and adjusted according to the adjustment displacement of the seat height, as shown in Fig. 12.
2. When the height position of the seat cushion is properly adjusted, release the cam adjusting button to lock the state, as shown in the thirteenth figure. The upper spring 34 pushes the striker 33 upward to return to the original position, so that the lower valve piece 381 is restored to fit the inner inclined surface 3800 of the valve seat 38, and the upper valve piece 382 is fitted to the inner inclined surface 313 of the intermediate cylinder 31, and the upper valve The piece 382 is also pushed against the inner bevel 313 of the middle cylinder barrel 31 by the lower spring 40. The upper and lower valve plates 382 and 381 block the upper oil chamber 36, the intermediate oil chamber 41 and the lower oil chamber 39, so that the oil in the three oil chambers cannot flow through each other. Because the cam adjusting button is in the locked state, the oil in the middle oil chamber 41 can inhibit the valve seat 38 and the upper and lower valve plates 382, 381 from being pulled up by the striker 33, so that the height of the seat cushion is fixed, and the seat cushion will not move up again, and will not Change the distance from the frame.
As can be seen from the above description, the creation of the upper and lower valve plates 382, 381 allows the upper, middle and lower oil chambers 36, 41, 39 to be incapable of intercommunication in the locked state, and then to the locked state. The seat cushion can no longer be pressed or pulled up, so that the seat cushion and the frame are integrated, and the seat cushion column is more perfect in application.
Please refer to the half cross-sectional view of the second embodiment of the hydraulic actuator in the closed state of the second embodiment, and the lower half of the cross-sectional view in the intercommunication state. The difference between the second embodiment and the first embodiment shown in the eighth embodiment is that the upper valve piece 382 of the second embodiment is fixed to the bottom end of the striker 33 and cannot be axially engaged on the striker 33. Displacement, the lower valve piece 381 is sleeved on the outer side of the lower striker 332, and the lower spring 40 is disposed under the lower valve piece 381. The lower spring 40 is sleeved on the outer side of a spring sleeve 42. The middle portion of the bolt 43 is inserted through a bolt 43. The top end of the bolt 43 is screwed to the bottom end of the lower striker 332. The spring sleeve 42 is interlocked with the striker 33 and the lower striker 332. The outer edge of the bottom end of the spring sleeve 42 protrudes outwardly from a ring abutting ring 420 for supporting the bottom end of the lower spring 40. The top end of the armpit spring 40 can push the lower valve piece 381 upward. When the oil passage is closed, as shown in Fig. 14, the upper and lower valve plates 382, 381 block the oil passages of the upper, middle and lower oil chambers 36, 41, 39 from intercommunicating. When the control cam adjusting button pushes the upper striker 330, the striker 33, the lower striker 332 and the spring sleeve 42 of the hydraulic actuator 3 downward, the seat cushion height position can be adjusted at this time, and the upper spring is compressed when the striker 33 is pressed down. 34, the lower striker 332, the upper valve piece 382, and the lower valve piece 381 which are integrally moved with the striker 33 are simultaneously moved downward, and the upper and lower valve pieces 382 and 381 are respectively separated from the inner inclined surface 313 of the intermediate cylinder 31 and the valve. The inner inclined surface 3800 of the seat 38 (as shown in the fifteenth figure) allows the oiling chamber 36, the middle oil chamber 41 and the lower oil chamber 39 to communicate with each other to adjust the height of the seat cushion.
Please refer to the half cross-sectional view of the hydraulic actuator oil circuit in the closed state of the third embodiment of the present invention shown in the sixteenth and seventeenth and seventeenth, and the lower half cross-sectional view in the intercommunication state; the creation shown in the eighteenth and nineteenth embodiments The fourth embodiment is a half cross-sectional view of the hydraulic actuator oil passage closed state and a half cross-sectional view of the intercommunication state; and the hydraulic actuator oil passage of the fifth embodiment shown in the twenty-first and twenty-first embodiments is closed. Half section view, half section view of the intercommunication state. The third, fourth, and fifth embodiments are not provided with the lower spring 40. The upper valve piece 382 of the third embodiment is an O-ring, and the rod wall of the striker 33 is recessed with a ring-shaped concave ring 334 corresponding to the upper valve piece 382, and the inner surface of the upper valve piece 382 is embedded and positioned. The outer surface of the sheet 382 protrudes beyond the wall of the striker 33. In the striker lock state, the outer wall of the upper valve piece 38 is in contact with the inner wall of the intermediate cylinder 31 located above the valve hole 384. The hollow inner wall of the valve seat 38 is recessed in a recessed portion 385 corresponding to the lower valve piece 381, and the lower valve piece 381, which is also an O-ring, is inserted outside, and the inner surface of the lower valve piece 381 is protruded. The lower concave ring 385 is fitted. The bottom end outer wall of the striker 33 has a straight surface 335 with an enlarged outer diameter, and the rod wall of the striker 33 located above the straight surface 335 has an arc concave surface 336 having a smaller outer diameter. The oil passage is closed, as shown in Fig. 16, the striker 33 is topped up by the upper spring 34, so that the straight surface 335 of the striker 33 is fitted to the inner surface of the lower valve piece 381, and the middle oil chamber 41 and the lower oil chamber 39 are closed. The upper valve piece 382 is attached to the inner wall of the middle cylinder barrel 31 by the striker 33 to the upper outer wall, so that the oil passage between the middle oil chamber 41 and the upper oil chamber 36 is closed, and the oil in the middle oil chamber 41 is above the valve seat 38. The liquid is restrained and can no longer move up or down, so that the seat cushion can no longer slide up or down, and is integrated with the frame. The structure of the fourth embodiment of the present invention shown in Figs. 18 and 19, the difference between this embodiment and the third embodiment is that the structure of the lower valve piece 381 is the same as that of the first embodiment, but the lower valve The sheet 381 is fixed on the outer side of the bottom end of the striker 33, and the outer edge is an outer inclined surface 3810. The hollow end of the valve seat 38 corresponds to the inner wall of the outer inclined surface 3810, and has an inner inclined surface 3800. When the inner and outer inclined surfaces 3800 and 3810 are mutually When fitted, the middle and lower oil chambers 41, 39 can be blocked. According to the fifth embodiment of the present invention, the upper valve piece 382 and the lower valve piece 381 of the fifth embodiment are integrally formed as a hollow tubular structure, which is sleeved and fixed to the striker 33. Outside the bottom end. The upper surface of the upper valve piece 382 and the lower valve piece 381 respectively have outer inclined surfaces 3820 and 3810 which are in contact with the inner inclined surfaces 313 and 3800 of the valve seat 38. When the slamming needle 33 is locked, the oiling chamber 36 and the intermediate oil chamber 41 can be The lower oil chamber 39 is isolated.
In summary, this creation is not only novel and industrially useful, but also patents are filed according to law.

1‧‧‧External pipe 2‧‧‧Inner pipe 3‧‧‧Hydraulic actuator 4‧‧‧Rise pipe 20‧‧‧Clamp 30‧‧‧Upper cylinder 31‧‧‧ Medium cylinder barrel 32‧‧‧ Cylinder barrel 33‧‧‧ striker 301, 320‧‧‧ upper sealing plug 302, 321‧‧‧ lower sealing plug 3010‧‧‧ top outer wall 303‧‧ ‧ socket 3030‧‧ ‧ receiving section 3031‧‧ perforation 3032‧ ‧ ‧ thread surface 3033‧‧ ‧ thread surface 330‧‧ ‧ upper needle 34 ‧ ‧ upper spring 331 ‧ ‧ shoulder 35 ‧ ‧ floating piston 36 ‧ ‧ oiling room 37 ‧ ‧ air chamber 310 ‧‧‧Oil holes 311, 380‧‧‧ Oil ring 312‧‧‧ Oil circuit 38‧‧‧ Seat 332‧‧‧ Lower striker 381‧‧‧ Lower valve 3810; 382‧‧‧ Outer bevel 0
3800, 313‧‧‧ Inner slope 39‧‧‧ Oil compartment 333‧‧‧Shrink section 382‧‧‧Upper valve 40‧‧‧ Lower spring 384‧‧‧ Valve hole 41‧‧‧ Oil room 42‧ ‧ spring sleeve 420‧‧ ‧ ring 43 ‧ ‧ bolt 334 ‧ ‧ upper recessed ring 385 ‧ ‧ under recessed ring 335 ‧ ‧ straight face 336 ‧ ‧ arc concave

The first figure shows a seat cushion assembly reference drawing of the first embodiment of the present invention.
The second figure shows a perspective view of the hydraulic actuator of the first embodiment of the present invention.
The third figure shows a plan sectional view of the hydraulic actuator of the first embodiment of the present invention.
The fourth figure shows a perspective cross-sectional view of the hydraulic actuator of the first embodiment of the present invention.
Fig. 5 is a perspective view showing the upper half of the hydraulic actuator of the first embodiment of the present invention.
Fig. 6 is a plan sectional view showing the upper half of the hydraulic actuator of the first embodiment of the present invention.
Fig. 7 is a perspective view showing the lower half of the hydraulic actuator of the first embodiment of the present invention.
Fig. 8 is a plan sectional view showing the lower half of the hydraulic actuator of the first embodiment of the present invention.
Fig. 9 is a cross-sectional view showing the hydraulic actuator oil passage intercommunication state of the first embodiment of the present invention.
Fig. 10 is a cross-sectional view showing the upper half of the hydraulic actuator oil passage of the first embodiment of the present invention.
Fig. 11 is a cross-sectional view showing the lower half of the hydraulic actuator oil passage of the first embodiment of the present invention.
Fig. 12 is a cross-sectional view showing the height adjustment of the hydraulic actuator of the first embodiment of the present invention.
Fig. 13 is a cross-sectional view showing the lower half of the height adjustment of the hydraulic actuator of the first embodiment of the present invention.
Fig. 14 is a cross-sectional view showing the lower half of the hydraulic actuator oil passage in the second embodiment of the present invention.
Fig. 15 is a cross-sectional view showing the lower half of the hydraulic actuator oil passage in the second embodiment of the present invention.
Fig. 16 is a half cross-sectional view showing the hydraulic actuator oil passage closed state of the third embodiment of the present invention.
Figure 17 is a cross-sectional view showing the lower half of the hydraulic actuator oil passage in the third embodiment of the present invention.
Fig. 18 is a half cross-sectional view showing the hydraulic actuator oil passage closed state of the fourth embodiment of the present invention.
Fig. 19 is a half cross-sectional view showing the hydraulic actuator oil passage in the fourth embodiment of the present invention.
Fig. 20 is a cross-sectional view showing the lower half of the hydraulic actuator oil passage in the fifth embodiment of the present invention.
Fig. 21 is a cross-sectional view showing the lower half of the hydraulic actuator oil passage in the fifth embodiment of the present invention.

31‧‧‧ medium cylinder

32‧‧‧ lower barrel

33‧‧‧Needle

320‧‧‧Upper sealing plug

36‧‧‧ Oiling room

380‧‧‧ Oil ring

312‧‧‧ oil road

38‧‧‧ valve seat

332‧‧‧ Under the striker

381‧‧‧ lower valve

3810, 3820‧‧‧ outer bevel

3800, 313‧‧‧ inner bevel

39‧‧‧Under the oil room

333‧‧‧Shrinking section

382‧‧‧Upper valve

40‧‧‧ Lower spring

384‧‧‧ valve hole

41‧‧‧中油室

Claims (7)

A bicycle seat post structure consisting of an outer tube, a bottom end penetrating into the inner tube of the outer tube, and a hydraulic actuator disposed in the inner and outer tubes; wherein the hydraulic actuation The utility model has an upper cylinder barrel, a middle cylinder barrel, a lower cylinder barrel and a striker penetrating in the middle cylinder barrel; the middle cylinder barrel is interposed between the upper and lower cylinder barrels, and the two ends respectively penetrate the upper portion The inside of the lower cylinder, the two ends of the upper and lower cylinders are respectively plugged with a sealing plug; the inside of the upper cylinder is located outside the middle cylinder, and the sleeve is provided with a floating piston, below and above the floating piston Between the cylinder barrel and the middle cylinder barrel, there is an oiling chamber, and the upper part of the floating piston is separated by a gas chamber; the gap between the needle and the middle cylinder barrel has an oil path, and the barrel wall of the middle cylinder corresponds to the oil chamber The oil hole is arranged to communicate with the oiling chamber, and the outer wall of the striker corresponding to the oil hole is blocked by the oil ring and the inner wall of the middle cylinder; the top end of the striker protrudes from the top of the upper barrel, and the bottom end Extending out from the bottom end of the middle cylinder barrel; the top end of the middle cylinder barrel is fixed to a bottom end of a socket fixed inside the upper cylinder barrel, the socket intermediate a receiving section in which an outer spring is sleeved on the outer side of the striker, the top end of the upper spring abuts against a shoulder of the striker, the upper spring has a pushing force upwardly; the middle cylinder is in the lower cylinder The bottom end of the inner portion is fixedly connected with a hollow valve seat, and the outer wall of the valve seat is provided with an oil ring in contact with the inner wall of the lower cylinder; the bottom end of the striker is fixed with a lower valve piece, and the lower valve piece is pulled by the upper spring thrust and The hollow end of the valve seat is in contact with the air block, and the inner portion of the lower cylinder below the lower valve plate is separated from the oil chamber; the gap between the lower cylinder and the middle cylinder is located above the valve seat. The system has a middle oil compartment, the valve wall has a valve hole for communicating the inner oil chamber with the inner portion of the valve seat; the middle oil chamber communicates with the oil passage between the striker and the middle cylinder;
The main improvement is that the valve seat is located outside the striker between the upper oil chamber and the lower oil chamber, and is fastened with an upper valve piece that is interlocked with the striker. The upper valve piece is in the locked state of the striker, and the valve hole can be above the valve hole. The oil circuit is blocked, and the oiling chamber is isolated from the middle oil chamber. The bicycle seat post structure according to claim 1, wherein the upper valve piece is sleeved outside a narrowing section of the striker, and the upper valve piece is axially displaceable in the diameter reduction section, the upper valve The bottom end of the piece is provided with a lower spring, the top end of the lower spring is in contact with the bottom end of the lower valve piece, and the bottom end abuts against the flat surface of the striker. The bicycle seat post structure according to claim 1, wherein the lower valve piece is sleeved on the outer side of the bottom end of the striker, and the bottom end of the lower valve piece is supported by a lower spring. The spring has the force to push the lower valve plate up. The bicycle seat post structure according to claim 2, wherein the outer edges of the upper and lower valve plates are in contact with the corresponding surfaces of the valve seat, and are in contact with each other by a slope. The bicycle seat post structure according to claim 1, wherein the upper and lower valve plates are O-ring structures, and the wall of the striker bar is recessed by a recessed ring corresponding to the upper valve plate. The inner surface of the valve piece is embedded and positioned, and the outer surface of the upper valve piece protrudes outside the wall of the striker rod. When the striker is locked, the outer wall of the upper valve piece is in contact with the inner wall of the middle cylinder barrel located above the valve hole; a hollow inner wall correspondingly recesses a recessed concave ring corresponding to the lower valve plate, and the outer surface of the lower valve plate is embedded, and the inner surface of the lower valve piece protrudes out of the lower concave ring; the outer wall of the bottom end of the striker has an enlarged The straight surface of the outer diameter, the rod wall of the striker positioned above the straight surface has a concave concave surface with a smaller outer diameter. The bicycle seat post structure according to claim 1, wherein the upper valve plate is an O-ring, and the upper wall of the striker bar is recessed in a recess corresponding to the upper valve plate, and the upper valve plate is provided. The inner surface is embedded and positioned, and the outer surface of the upper valve piece protrudes outside the wall of the striker rod. When the striker is locked, the outer wall of the upper valve piece is in contact with the inner wall of the middle cylinder barrel located above the valve hole; the lower valve plate is fixed On the outer side of the bottom end of the striker, the outer edge is an outer bevel, and the hollow end of the bottom end of the valve seat corresponds to the inner wall of the outer bevel, and has an inner bevel. The bicycle seat post structure according to claim 1, wherein the upper valve piece and the lower valve piece are integrated into a hollow tubular structure, which is sleeved and fixed on the outer side of the bottom end of the striker; the upper valve piece and The outer side of the lower valve piece has an outer inclined surface and an inner inclined surface corresponding to the valve seat, and the upper oil chamber, the middle oil chamber and the lower oil chamber can be insulated when the needle is locked.