CN209839041U

CN209839041U - Compression hydraulic buffer mechanism for oil damper

Info

Publication number: CN209839041U
Application number: CN201920371593.0U
Authority: CN
Inventors: 王磊; 兰宗太
Original assignee: Sichuan Ningjiang Shanchuan Machinery Co Ltd
Current assignee: Sichuan Ningjiang Shanchuan Machinery Co Ltd
Priority date: 2019-03-22
Filing date: 2019-03-22
Publication date: 2019-12-24
Anticipated expiration: 2029-03-22

Abstract

The utility model discloses a compression hydraulic buffer mechanism for an oil damper, which is arranged on a bottom valve of the oil damper, wherein the bottom valve comprises a bottom valve seat and a valve rod, and the bottom valve seat is sleeved on the valve rod; the valve rod extends vertically, a working cavity and a storage cavity of the oil damper are respectively arranged at two ends of the extending direction of the valve rod, the valve rod is provided with a hollow inner cavity extending along the extending direction of the valve rod, and the hollow inner cavity forms a flow cavity communicated with the working cavity and the storage cavity of the oil damper; the automatic plugging device further comprises a return spring, a plugging cover, a stop block, wherein the plugging cover is positioned above the valve rod, the return spring is positioned between the plugging cover and the valve rod, and the return spring is a compression spring; the blocking cover is provided with a through hole, and the stop block has an area which completely covers and seals the through hole.

Description

Compression hydraulic buffer mechanism for oil damper

Technical Field

The invention relates to an oil damper, in particular to a compression hydraulic buffer mechanism for the oil damper.

Background

The working principle of the oil damper is that when the vehicle body and the vehicle axle are vibrated to generate relative motion, a piston in the damper moves up and down, and oil in a damper cavity repeatedly flows into another cavity from one cavity through different pores. The friction between the hole wall and oil and the internal friction between oil molecules form damping force to the vibration, so that the vibration energy of the automobile is converted into oil heat energy, and the oil heat energy is absorbed by the shock absorber and dissipated into the atmosphere. Conventional fluid bumper shock absorber compression end does not have buffer gear, and when the vehicle went, when meetting the circumstances such as road surface convex closure, emergency braking, the downward rapid motion of bumper shock absorber, the crashproof pad that only can rely on the vehicle at this moment offsets the impact force of striking, and the impact force of automobile body can not be offset completely to the crashproof pad, and remaining impact force can cause great influence to the travelling comfort and the nature controlled of vehicle.

Disclosure of Invention

The utility model discloses a design aim at can the significantly reduced impact force when the compression stroke of bumper shock absorber is terminal, be favorable to improving vehicle travelling comfort and nature controlled.

The technical scheme is that a compression hydraulic buffer mechanism for an oil damper is arranged on a bottom valve of the oil damper, the bottom valve comprises a bottom valve seat and a valve rod, and the bottom valve seat is sleeved on the valve rod; the valve rod extends vertically, a working cavity and a storage cavity of the oil damper are respectively arranged at two ends of the extending direction of the valve rod, the valve rod is provided with a hollow inner cavity extending along the extending direction of the valve rod, and the hollow inner cavity forms a flow cavity communicated with the working cavity and the storage cavity; the automatic plugging device further comprises a return spring, a plugging cover, a stop block, wherein the plugging cover is positioned above the valve rod, the return spring is positioned between the plugging cover and the valve rod, and the return spring is a compression spring; the blocking cover is provided with a through hole, the stop block has an area which completely covers and closes the through hole, the upper surface of the stop block contacts the blocking cover, and the lower surface of the stop block contacts the return spring; when the return spring is in a first state, the stop block seals the through hole and isolates the through hole from the flow cavity; when the return spring is in a second state, the stop block is exposed out of the through hole and communicated with the through hole and the flow cavity.

The technical principle is as follows: in the compression stroke of the piston of the conventional oil shock absorber, oil flows into the storage cavity through the working cavity, and the vibration is damped by utilizing the friction force between the oil and the hole wall, so that the shock absorption effect is achieved, and the circulation channel of the oil is closed at the tail end of the compression stroke. Thus, when the oleo-damper is at the end of the compression stroke, the remaining impact force cannot be eliminated by the oleo-damping, but only by the mechanical elimination of the crash pad, which can have a large impact on the comfort and handling of the vehicle. Therefore, the scheme eliminates the impact force at the tail end of the compression stroke of the oil damper by adding an additional hydraulic buffer mechanism. The bottom valve of this scheme includes bottom valve seat and valve rod, sets the hollow structure who has along its extending direction with the valve rod, and hollow structure stroke has flowed the chamber, and this chamber that flows has communicate working chamber and storage chamber. A blocking cover is arranged above the valve rod, a through hole is formed in the blocking cover, and the through hole can be communicated with a flowing cavity of the valve rod. The design principle of this scheme still lies in, still sets up reset spring and dog and blocks and open the intercommunication of through-hole and valve rod inner chamber. Specifically, the upper part of the stop block is pasted with the plugging cover, and the lower end of the stop block is connected with a return spring. The return spring is a compression spring, and the spring force of the return spring can be applied to the stop block to close the through hole. When the buffer mechanism is used, the compression of the oil damper is in the initial stage and the middle stage, oil mainly enters the storage cavity through the original channel, and the stop block seals the through hole in the sealing cover under the spring force action of the return spring during the process, so that the communication between the through hole and the flow cavity is blocked. When the compression of the oil damper is at the tail end, because the original oil passage is closed, the residual impact force pushes the oil, and the oil flows everywhere, so that the stop block is pushed by the through hole; because reset spring is connected to the dog lower extreme, under the impact force effect, the dog will promote reset spring to the dog leaves the shutoff lid, through-hole and flow chamber intercommunication, and then fluid enters into the storage chamber from the working chamber through-hole and flow chamber, plays the effect of supplementary fluid buffering, thereby the effectual terminal vibrations of compression formation that alleviate.

Furthermore, the flow cavity is formed by connecting two sections of cylindrical cavities with different inner diameters to form a stepped cavity, and the stepped cavity comprises a first cavity and a second cavity; the first cavity is close to the working cavity, and the inner diameter of the first cavity is larger than that of the second cavity; the return spring is arranged in the first cavity, and the lower end of the return spring is connected to the step surface of the step cavity. The flow cavity is a stepped cavity, so that the reset spring is favorably arranged in the stepped cavity, and the reset spring is convenient to fix.

Furthermore, the stop block is a revolving body structure with a flange and comprises a main body part and a flange, the main body part is a cylindrical cup body structure and is provided with an open inner cavity and an upper end opening communicated with the inner cavity, the upper edge of the main body part extends outwards in the radial direction to form the flange, and the plane of the flange is horizontally arranged; the return spring is a cylindrical spiral spring; the outer diameter of the main body part is consistent with the inner diameter of the return spring, and the main body part is inserted into the return spring; and the lower surface of the flange is in contact with the return spring, and the upper surface of the flange is flush with the lower surface of the plugging cover. The stop block is arranged in a revolving body structure with a flange, the outer diameter of the main body part is consistent with the inner diameter of the return spring, the stop block is favorably inserted into the return spring, the positions of the return spring and the stop block are kept consistent, and the relative positions of the stop block and the return spring are more stable under the impact of oil liquid.

Further, the blocking cover is in a bottle cap shape, an external thread is arranged on the valve rod, an internal thread is arranged on the inner circumferential surface of the blocking cover, and the blocking cover is in threaded connection with the valve rod. Set up the shutoff lid and be the bottle lid form, and shutoff lid and valve rod threaded connection, be convenient for with shutoff lid fixed connection to valve rod on, can adjust reset spring's precompression power through adjusting screw in length moreover, and then adjust the energy that can cushion.

Furthermore, a second flow cavity is arranged on the bottom valve seat and is connected with the working cavity and the storage cavity, the floating stop block is vertically and slidably sleeved on the valve rod and is arranged above the bottom valve seat and has an area for closing the second flow cavity; and a conical spring is arranged between the floating stop block and the bottom valve seat.

Furthermore, the device comprises a recovery valve positioned in the cylinder barrel, a conical body is arranged below the recovery valve and the recovery valve, a conical surface of the conical body is arranged downwards, the conical body and the piston are coaxially arranged, the device also comprises a second compression spring, the conical surface is in contact with the upper end of the second compression spring, the conical body and the second compression spring are coaxially arranged, and the lower end of the second compression spring is connected with the floating stop block.

Further, the up end of the dog that floats sets up the annular, the radial width of annular is less than second compression spring's wire diameter, second compression spring's lower extreme is pressed the annular with annular interference fit is connected.

The beneficial effects of the invention are:

1. the device has the innovation points that the impact of the shock absorber on the vehicle body is relieved at the tail end of a compression stroke by adding the buffer mechanism at the compression tail end of the shock absorber, so that the comfort and the controllability of the vehicle are improved;

2. if the adjustment is proper, the anti-collision pad can even replace the function of the anti-collision pad of the shock absorber, thereby playing the role of reducing the cost of the shock absorber;

3. the blocking cover is a threaded cover similar to a bottle cap, and the stop block is a cup-shaped structure with a flange, so that the buffer mechanism is convenient to mount and is more stable and adjustable;

4. the buffering energy of the buffering mechanism can be adjusted by setting the size of the inner diameter of the flow cavity of the valve rod, so that the buffering mechanism is flexible in design and is suitable for different requirements.

Drawings

FIG. 1 is a schematic view of an oil damper according to the present invention;

fig. 2 is a schematic view of the oil damper according to the present invention in a compression stroke.

The labels in the figure are: the valve comprises a 1-recovery valve, a 2-second compression spring, a 3-blocking cover, a 30-through hole, a 4-stop block, a 5-return spring, a 6-floating stop block, a 7-conical spring, an 8-fluid valve plate, a 9-bottom valve seat, a 40-channel I, a 10-valve rod, a 101-first cavity, a 102-second cavity, a 11-valve plate combination, a 12-limiting block, a 13-nut, a 14-conical body and a 90-second flow cavity.

Detailed Description

Example (b):

as shown in fig. 1, the oil damper includes a rebound valve 1 and a bottom valve located in a cylinder, wherein the bottom valve includes a bottom valve seat 9, a valve rod 10, a flow valve plate 8, a valve plate assembly 11, a limit block 12, and a nut 13, wherein the valve rod 10 is a screw rod, and the valve rod 10 penetrates through the center of the bottom valve seat 9; the damping value of the bottom valve assembly can be adjusted by adjusting the flow valve plate 8, the valve plate combination 11, the limiting block 12 and the nut 13.

In a conventional oleo-type shock absorber, during its compression stroke, oil flows into a reservoir chamber via a working chamber. Specifically, in the present embodiment, as shown in fig. 2, the bottom valve seat 9 is provided with a second flow hole 90, the second flow hole 90 communicates the working chamber and the reservoir chamber, and the oil enters the reservoir chamber through the first passage 40 formed by the second flow hole 90 after being compressed in both the early stage and the middle stage of the compression stroke. The structure of the oil damper and the principle of oil flow will be described in detail below. The floating stop block 6 is axially and slidably sleeved on the valve rod 9 and is positioned on the bottom valve seat 9; the lower end face of the floating stop block 6 is provided with an area for plugging the second flow cavity 90, and the upper end face of the floating stop block 6 is connected with the second compression spring 2; a conical spring 7 abutting against the lower surface of the floating stopper 6 is provided below the floating stopper 6. Initially, the conical spring 7 pushes against the floating stop 6, exposing the second flow orifice 90, and when the oil is compressed, it enters the reservoir through the second flow orifice 90. The lower end of the recovery valve 1 is provided with the conical body 14, the conical body 14 presses the second compression spring 2 downwards to enable the floating stop block 6 to move downwards until the elastic force of the conical spring 7 is offset, and the floating stop block 6 is pushed to shield the second flow hole 90 of the bottom valve body 9, so that the oil liquid flow passage is sealed. The cone 14 is provided to have a better centering effect of the second compression spring 2 and the cone 14, and the second compression spring 2 has a certain shock-absorbing effect. In the early and middle stages of the compression stroke, the restoring valve 1 is depressed, thereby urging oil from the working chamber into the reservoir chamber via the second flow hole 90. Meanwhile, the restoring valve 1 moves downwards to a certain degree, elastic force is applied to the floating stop 6 through the second compression spring 2, so that the floating stop 6 gradually moves downwards until the elastic force of the conical spring 7 is overcome, the floating stop 6 completely closes the second flow hole 90, and at the moment, the oil flow passage is closed when the oil reaches the tail end of the compression stroke. In the later compression stroke, the residual impact force is offset by the anti-collision pad of the shock absorber, so that the shock absorption effect is poor, and great influence is caused on the comfort and the controllability of the vehicle.

For this purpose, the scheme eliminates the impact force at the compression end of the oil damper by adding an additional hydraulic buffer mechanism. The valve rod 10 of this scheme has along its extending direction's hollow structure, specifically to in this embodiment, includes first chamber 101 and second chamber 102, and wherein the vertical setting of valve rod 10 is in the cylinder, and first chamber 101, second chamber 102 set up with the axle center, and the internal diameter of first chamber 101 is greater than the internal diameter of second chamber 102, and first chamber 101 and second chamber 102 link to each other and form the shoulder hole, and first chamber 101 is located the top of second chamber 102. In the first chamber 101, a return spring 5, specifically, a coil compression spring is provided, the lower end of the return spring 5 is connected to the step surface of the flow chamber, a sealing cap 3 is provided at the upper end of the valve stem 10, the sealing cap 3 is shaped like a bottle cap, the inner circumferential surface thereof is provided with an internal thread, and the outer circumference of the valve stem 10 is provided with an external thread, so that the sealing cap 3 can be conveniently and fixedly installed above the valve stem 10, and the screwing degree of the sealing cap 3 can be adjusted. The upper end face of the blocking cover 3 is provided with a through hole 30, and the through hole 30 is used for connecting the flow chamber. In order to control the communication and the obstruction of the through hole 30 and the flow cavity, a stop block 4 is further arranged between the blocking cover 3 and the return spring 5, wherein the stop block 4 is of a rotary structure with a flange and comprises a main body part and a flange, the main body part is of a cylindrical cup body structure and is provided with an open inner cavity and an upper end opening communicated with the inner cavity, the upper edge of the main body part extends outwards in the radial direction to form the flange, and the plane of the flange is horizontally arranged; the outer diameter of the main body part is consistent with the inner diameter of the return spring 5, and the main body part is inserted into the return spring 5; the lower surface of the flange is in contact with the upper end of the return spring 5, and the upper surface of the flange is pushed by the elastic force of the return spring 5 to align the lower surface of the plugging cover 3.

In the initial stage and the middle stage of compression, oil mainly enters the storage cavity through the original channel, and the stop block 4 seals the through hole 30 on the blocking cover 3 in the period, so that the communication between the through hole 30 and the flow cavity is blocked. When the compression of the oil damper is at the end, because the first passage 40 is closed, the oil has no path through which the oil can flow, and the rest impact force pushes the stop block 4; because reset spring 5 is connected to dog 4 lower extreme, under the impact force effect, dog 4 will promote reset spring 5 to dog 4 leaves shutoff lid 3, through-hole 30 and the chamber intercommunication that flows, and then fluid enters into the working chamber through-hole 30 and the chamber that flows, plays the effect of fluid buffering.

The utility model discloses an energy that buffer gear can cushion can be according to the regulation that the particular case of motorcycle type was adjusted to reach the best requirement of driving. The adjustment of the buffering energy can be performed through the inner diameter of the second chamber 102 of the valve rod 10, and the adjustment of the inner diameter of the second chamber 102 can adjust the flow rate of the oil liquid, so as to adjust the buffering energy.

The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. The compression hydraulic buffer mechanism for the oil damper is characterized by being arranged on a bottom valve of the oil damper, wherein the bottom valve comprises a bottom valve seat and a valve rod, and the bottom valve seat is sleeved on the valve rod; the valve rod extends vertically, a working cavity and a storage cavity of the oil damper are respectively arranged at two ends of the extending direction of the valve rod, the valve rod is provided with a hollow inner cavity extending along the extending direction of the valve rod, and the hollow inner cavity forms a flow cavity communicated with the working cavity and the storage cavity; the automatic plugging device further comprises a return spring, a plugging cover, a stop block, wherein the plugging cover is positioned above the valve rod, the return spring is positioned between the plugging cover and the valve rod, and the return spring is a compression spring; the blocking cover is provided with a through hole, the stop block has an area which completely covers and closes the through hole, the upper surface of the stop block contacts the blocking cover, and the lower surface of the stop block contacts the return spring; when the return spring is in a first state, the stop block seals the through hole and isolates the through hole from the flow cavity; when the return spring is in a second state, the stop block is exposed out of the through hole and communicated with the through hole and the flow cavity.

2. A compression hydraulic buffer mechanism for an oleo-hydraulic shock absorber according to claim 1 wherein said flow chamber is a stepped chamber formed by the connection of two cylindrical chambers of different inside diameters, said flow chamber comprising a first chamber, a second chamber; the first cavity is close to the working cavity, and the inner diameter of the first cavity is larger than that of the second cavity; the return spring is arranged in the first cavity, and the lower end of the return spring is connected to the step surface of the step cavity.

3. A compression hydraulic cushioning mechanism for an oleo-hydraulic shock absorber according to claim 2, wherein said stopper is of a flanged solid of revolution construction comprising a body portion and a flange, said body portion being of a cylindrical cup construction having an open interior and an upper end opening communicating with the interior, an upper edge of said body portion extending radially outwardly to form a flange, the plane of said flange lying horizontally; the return spring is a cylindrical spiral spring; the outer diameter of the main body part is consistent with the inner diameter of the return spring, and the main body part is inserted into the return spring; the lower surface of the flange is in contact with the upper end of the return spring, and the upper surface of the flange is flush with the lower surface of the plugging cover.

4. A compression hydraulic buffer mechanism for an oleo-hydraulic shock absorber according to claims 1-3 characterized in that the cap is in the form of a bottle cap, the outer circumferential surface of the upper end of the valve stem is provided with external threads, the inner circumferential surface of the cap is provided with internal threads, and the cap and the valve stem are threadedly coupled.

5. An oil damper comprising a compression hydraulic cushion mechanism for an oil damper according to any one of claims 1 to 4, wherein a second flow chamber is provided in the base valve seat, the second flow chamber connecting the working chamber and the reservoir chamber, and a floating stopper vertically slidably fitted on the valve rod, the floating stopper being provided above the base valve seat and having an area for closing the second flow chamber; and a conical spring is arranged between the floating stop block and the bottom valve seat.

6. The hydraulic shock absorber as claimed in claim 5, which further comprises a rebound valve disposed in the cylinder, a cone disposed below the rebound valve, a second compression spring having a tapered surface facing downward, the tapered surface contacting an upper end of the second compression spring, the cone being coaxially disposed with the second compression spring, and a lower end of the second compression spring being connected to the floating stopper.

7. The oil damper for the oil damper according to claim 6, comprising a compression hydraulic cushion mechanism for the oil damper according to any one of claims 1 to 4, wherein an annular groove is provided on an upper end surface of the floating stopper, and a lower end of the second compression spring is interference-connected to the annular groove.