CN2430340Y

CN2430340Y - Shock-proof of bicycle cushion of seat

Info

Publication number: CN2430340Y
Application number: CN 00204017
Authority: CN
Inventors: 王友仁
Original assignee: Fu Luong Hi Tech Co Ltd
Current assignee: Fu Luong Hi Tech Co Ltd
Priority date: 2000-03-22
Filing date: 2000-03-22
Publication date: 2001-05-16
Anticipated expiration: 2010-03-22

Abstract

The utility model provides a shock damper for bicycle seat cushions, which is assembled between the bicycle seat cushion and a framework. An actuating mechanism of the shock damper is connected to the lower part of the seat cushion. The actuating mechanism is abutted on a buffering bar, while an oil chamber which is filled with hydraulic oil and a gas chamber which is filled with nitrogen gases are arranged inside the buffering bar. The shock can be absorbed more effectively by the volume change of the gas chamber and the oil chamber inside the shock damper when the bicycle passes through uneven road surfaces. The bicycle is more comfortable in traveling.

Description

Shock absorber for bicycle saddle

The present invention relates to a bicycle seat cushion shock absorber, and more particularly to a seat cushion shock absorber which is fixedly connected between a bicycle seat cushion and a frame and has an air chamber and an oil chamber for absorbing shock.

The utility model discloses a bicycle is equipped with a shock absorber usually between seatpad and skeleton, and its inside generally installs a spring to absorb the vibrations that come from traveling on uneven road surface, the utility model discloses just improve to this kind of shock absorber of inside installation spring.

As shown in fig. 1, which is a cross-sectional view of a conventional shock absorber fixed to a bicycle, a conventional shock absorber 1 is fixed between a seat 2 and a frame 3 of the bicycle, and includes an outer tube 11, an actuating rod 12, a spring 13 and a joint 14; wherein,

the outer tube 11 is disposed in the frame 3 of the bicycle and has an axial chamber 111, and a bottom cap 112 is screwed to the bottom end of the chamber 111.

The actuating rod 12 is installed in the chamber 111 and protrudes through the outer tube 11 toward the seat 2.

The spring 13 is disposed between the actuating rod 12 and the bottom cover 112.

The joint 14 is fixed to the upper end of the actuating rod 12 and is fixed to the seat cushion 2.

When the bicycle runs on uneven road surface, the bicycle frame 3 will drive the outer tube 11 to move up and down, but because the bottom end of the seat cushion 2 for the user to sit is provided with the actuating rod 12 and the spring 13 is arranged between the bottom end of the actuating rod 12 and the bottom of the outer tube 11, the bicycle can run more comfortably by means of the shock absorption of the spring 13; although the conventional shock absorber 1 can achieve the desired shock absorbing effect by using the spring 13, generally, the spring 13 has a strong rigidity, and the deformation amount when being applied with force is too small, so that the shock absorbing effect of the seat cushion 2 is not satisfactory because the seat cushion 2 can still greatly vibrate with the bicycle under the action that the spring 13 can not effectively absorb most of the vibration.

Therefore, the present invention is directed to a bicycle seat cushion shock absorber with better shock absorbing effect than the spring shock absorber.

The utility model provides a bicycle saddle shock absorber, this saddle shock absorber equipment adorns in a seatpad and a skeleton of bicycle, it includes an outer tube of fixing on the bicycle skeleton, there is an axial chamber in it, assemble a bumper bar in the chamber of outer tube, assemble a bush of card support at the outer tube top in the chamber top, a nut of pressing the bush top is connected to the top spiro union of outer tube, this saddle shock absorber is equipped with an actuating mechanism more, it includes an actuating rod that wears to locate on the bush and can axial displacement, the above-mentioned actuating rod bottom is located the chamber of outer tube, with a bolt spiro union slip pad on it, the spiro union of the top of the above-mentioned actuating rod is a sleeve lid that is connected with the bicycle saddle;

the method is characterized in that: the buffer rod has an air chamber and an oil chamber, and an isolation valve area is arranged to isolate the air chamber and the oil chamber, a piston rod is arranged in the oil chamber, one end of the piston rod extends towards the direction of the seat cushion, the other end of the piston rod is fixedly connected with a piston, a through hole penetrating through the piston is arranged on the piston, and the top end of the piston rod can be abutted against a bolt of the actuating mechanism.

By adopting the structure, when the bicycle encounters vibration during running, the vibration can change the volumes of the air chamber and the oil chamber in the buffer rod when being transmitted to the shock absorber, thereby providing better shock absorbing effect and ensuring that the bicycle is more comfortable during running.

The bicycle seat cushion shock absorber of the present invention will be described in detail with reference to the preferred embodiments and the accompanying drawings, in which:

FIG. 1 is a cross-sectional view of a conventional shock absorber mounted to a bicycle;

FIG. 2 is a cross-sectional view of a preferred embodiment of the present invention mounted on a bicycle;

FIG. 3 is a cross-sectional view of a bumper bar according to a preferred embodiment of the present invention;

FIG. 4 is a diagram of a normal state of an embodiment of the present invention when not under compression;

FIG. 5 is a state diagram of the present invention after compression;

FIG. 6 is a comparison chart of the "load-deflection" test of the shock absorber according to a preferred embodiment of the present invention.

As shown in FIGS. 2 and 3, the bicycle seat cushion shock absorber 4 of the present embodiment is assembled between a seat 5 and a frame 6 of a bicycle, and includes an outer tube 41, a bumper bar 42, a bushing 43, an actuating mechanism 44, a nut 45, a cap 46 and a dust cover 47.

The outer tube 41 is installed in the carriage 6, and an axial containing chamber 410 is formed inside the outer tube, a threaded section 411 is formed at the bottom end of the containing chamber 410, and a fine adjustment bolt 412 capable of moving axially up and down is screwed on the threaded section 411.

The buffer rod 42 is axially assembled in the accommodating chamber 410 of the outer tube 41, and is provided with a hollow tube 421, the bottom end of the hollow tube 421 is fixedly connected with a bottom cover 422, an isolation valve 423 capable of lifting and falling inside the hollow tube 421 is assembled inside the hollow tube, the isolation valve 423 is used as a boundary, an oil chamber 424 filled with hydraulic oil and positioned above and an air chamber 425 filled with nitrogen, having a preset air pressure and positioned below are formed in the hollow tube 421; a piston rod 426 with a top end protruding out of the hollow tube 421 is installed above the oil chamber 424, an oil seal group 427 and a jacket 428 are sleeved on the piston rod 426, the oil seal group 427 and the jacket 428 are embedded in the top end of the hollow tube 421, a piston 429 is screwed at the bottom end of the piston rod 426, and an axial through hole 420 is formed in the piston 429.

The bush 43 is attached to the inside of the distal end of the outer tube 41 and abuts against the distal end face of the outer tube 41.

The actuating mechanism 44 has an actuating rod 441 extending through the bushing 43, and a lower sliding pad 443 is screwed on the bottom end of the actuating rod 441 by a bolt 442, and the bolt 442 abuts against the top end of the piston rod 426 of the damping rod 42.

The nut 45 is sleeved on the actuating rod 441 and screwed on the outer side of the top end of the outer tube 41, and the nut 45 can tightly abut against the bushing 43.

The cover 46 is locked to the top end of the actuating rod 441 and is fixed to the bicycle seat 5.

The dust-proof cover 47 is sleeved on the actuating rod 441 and is arranged between the cover 46 and the nut 45.

When the bicycle passes through an uneven road surface, the framework 6 of the bicycle is firstly vibrated and moves up and down, when the framework moves up, the outer pipe 41 fixed with the framework 6 moves up along with the framework, and drives the hollow tube 421 of the buffer rod 42 to move upwards, at this time, since the top end of the piston rod 426 of the buffer rod 42 is abutted against the bolt 442 at the bottom end of the actuating rod 441, and the top end of the actuating rod 441 is connected with the seat cushion 5 through the cover 46, therefore, in a state that the hollow tube 421 of the buffer rod 42 is moved upward by the vibration and the seat cushion 5 is pressed down by the user sitting thereon, the volumes of the air chamber 425 and the oil chamber 424 in the buffer rod 42 will change, and at the moment of change, because the air is easily compressed, the hydraulic oil in the oil chamber 424 will flow from the bottom end to the upper space through the through hole 420 formed on the piston 429, so that the piston rod 426 which finally props the seat cushion 5 will move downwards slowly, thereby avoiding the uncomfortable sitting caused by the instant violent movement of the seat cushion 5; similarly, when the compressed air in the air chamber 425 releases the compression force, the piston rod 426 can be pushed up, so that the piston rod 426 slowly moves up and down, thereby providing a better cushioning effect to the seat cushion 5 when the bicycle is shocked, and making the bicycle more comfortable.

To understand the operation principle of the present embodiment, the following description is provided for the relative operation relationship between the components:

as shown in fig. 4 and 5, when the piston rod 426 of the buffer rod 42 is not stressed (i.e. normally not carrying a human body), the piston 429 in the oil chamber 424 is constantly pressed upward against the bottom of the envelope 428 (as shown in fig. 4), because the air chamber 425 below the buffer rod 42 is filled with a predetermined pressure gas sufficient to support the weight of the human body, and the hydraulic oil in the oil chamber 424 has the characteristic that the liquid cannot be compressed, so that the volume is maintained constant, and therefore, the hydraulic oil forms an upward pushing force to push the piston 429 upward until the piston is pressed against the bottom of the envelope 428.

The following symbols, used for convenience of description, have the following representative meanings:

p0: the air pressure within the air chamber 425 that is not normally carrying a human condition;

v0: the volume within air chamber 425 that is not normally carrying a human body state;

p1: the air chamber 425 achieves balanced air pressure after carrying the human body;

v1: the volume of air chamber 425 that is balanced after carrying the body;

v: when the human body is carried to achieve balance, the piston rod 426 enters the oil chamber 424 to occupy the volume;

w: the weight of the seated person;

a: the piston rod 426 has a cross-sectional area.

As shown in fig. 5, when a user sits on the bicycle, the piston rod 426 receives the weight of the user, so that the piston rod 426 is displaced downward, the hydraulic oil in the oil chamber 424 below the piston 429 enters the oil chamber 424 above the piston 429 through the through hole 420, and the more the piston rod 426 is displaced downward, the more the hydraulic oil is displaced, the displaced hydraulic oil pushes down the isolation valve 423, so that the gas in the air chamber 425 is compressed and gradually decreases in volume, and the air pressure of the air chamber 425 gradually increases as the volume of the air chamber 425 decreases (assuming that the gas in the air chamber 425 is the ideal gas, the product of the volume of the fixed amount of gas and the air pressure is a certain value, namely P0 × V0= P1 × V1), until the air pressure is sufficient to achieve the gravity balance with the rider, namely W = P1 × a (if the piston 429 does not have the design of the through hole 420, then W = P1 × the cross-sectional area.

In other words, at this time, the piston rod 426 reaches the equilibrium position, and assuming that the volume of the piston rod 426 located in the oil chamber 424 is V (the mesh portion of the piston rod 426), the piston rod 426 will discharge the volume V of the hydraulic oil, and force the isolation valve 423 to press the air chamber 425 downward, so that the volume of the air chamber 425 is also reduced by the volume V, that is, V0-V1= V.

When the user stops riding and leaves the seat cushion, the gravity exerted on the piston rod 426 is immediately relieved, the hydraulic oil does not push the isolation valve 423 downwards any more, the isolation valve 423 also does not press the gas in the gas chamber 425 any more, at the moment, the high-pressure gas in the gas chamber 425 pushes the isolation valve 423 upwards, the isolation valve 423 pushes the hydraulic oil in the oil chamber 424 while moving upwards, but because the volume of the hydraulic oil cannot be compressed and reduced, part of the piston rod 426 (the net-shaped part of the piston rod 426) originally forced into the oil chamber 424 is pushed out of the oil chamber 424 upwards by the hydraulic oil, so that the volume occupied by the piston rod 426 in the oil chamber 424 is moved out, and a certain volume of the hydraulic oil is maintained; therefore, by means of the closed oil chamber 424, the incompressible property of the hydraulic oil, and the oil pressure generated by the high-pressure gas pre-filled into the air chamber 425, the piston rod 426 can be moved upward by the upward-pushing oil pressure generated by the high-pressure gas after losing the weight of the user without additionally using a device such as a tension spring; the air chamber 425 will eventually increase the volume V and return to the original volume V0, and the piston rod 426 will be pushed upward by the hydraulic oil against the bottom of the envelope 428 to its original normal state.

When a user shakes a bumpy road surface during riding, the piston rod 426 moves downwards relative to the oil chamber 424 instantly, and the isolation valve 423 also moves downwards relative to the oil chamber 424 instantly, so that the gas in the gas chamber 425 is compressed by the isolation valve 423 instantly to generate a buffering effect; when the bicycle is bumped and rebounded, the user stops riding and leaves the seat cushion as described above, the seat cushion is pushed upwards by the rebounding force of the high-pressure gas, and then the hydraulic oil flows through the through hole 420 to generate a damping force, so that the effect of shock absorption is achieved, and the user can obtain a comfortable shock absorption effect of dual oil pressure and air pressure when riding the bicycle.

From the above description, it can be known that the volume change of the high-pressure gas in the air chamber 425 and the incompressibility of the hydraulic oil in the oil chamber 424 can be used to achieve a good vibration damping effect; in addition, it can be known from the test chart of fig. 6 that: when the shock absorber 4 of the present invention and the previous shock absorber are subjected to the same load, the deformation of the shock absorber 4 of the present invention is larger than the previous shock absorber, such as the test curve in the load-deformation diagram of fig. 6, i.e. the rigidity of the present invention is smaller than the previous shock absorber, so that the rigidity of the previous shock absorber is too large, such as the test oblique line in fig. 6, and the situation of poor shock absorbing effect can be overcome by the shock absorber 4 of the present invention; the fine tuning bolt 412 on the outer tube controls the position of the buffer rod 42 in the inner chamber 411 of the outer tube 41, when the position of the buffer rod 42 is adjusted to be adjusted upward, the rigidity of the cushion shock absorber 4 is increased; and when adjusting the position of the buffer rod 42 downwards, the rigidity of the cushion shock absorber 4 can be reduced, the utility model discloses a cushion shock absorber can make the rider pass through uneven road surface, obtains better shock-absorbing effect, consequently, the utility model discloses a cushion shock absorber is not only unprecedented innovation, especially is a practical bicycle cushion shock absorber.

Claims

1. A kind of bicycle seat cushion shock absorber, this seat cushion shock absorber is assembled between a seat cushion and a skeleton of the bicycle, it includes a outer tube fixed on bicycle skeleton, there is an axial chamber in it, assemble a buffer stick in the chamber of the outer tube, assemble a bush that the card supports the top of the outer tube on the top of the chamber, connect a nut to support and press the bush top in the top of the outer tube, the shock absorber of this seat cushion has an actuating mechanism even, it includes a penetrating and locating on bush and can axially displaced actuating lever, the above-mentioned bottom end of actuating lever locates in chamber of the outer tube, check the spiro union slip pad on it with a screw, the top of the above-mentioned actuating lever spiro union one with cover that the bicycle seat cushion meets;

2. The bicycle seat cushion shock absorber as set forth in claim 1, wherein: the bottom end of the outer pipe is screwed with a fine adjustment bolt capable of adjusting the assembly height of the buffer rod.

3. The bicycle seat cushion shock absorber as set forth in claim 1, wherein: a dust-proof cover covering the actuating rod is connected between the cover and the nut.

4. The bicycle seat cushion shock absorber as set forth in claim 1, wherein: the oil chamber in the buffer rod is positioned above the air chamber.