CN218510064U - High-performance oil buffer - Google Patents

Abstract

The utility model belongs to the technical field of buffer manufacturing, in particular to a high-performance oil pressure buffer, which comprises a cylinder body, a piston and a piston rod, wherein the cylinder body is provided with a piston cavity and an end cover; the piston comprises an inverted-cone-shaped liquid passing part, a first piston body and a second piston body, wherein the first piston body and the second piston body are respectively positioned at the upper end and the lower end of the liquid passing part and are matched with the piston cavity, a plurality of first liquid passing channels are uniformly arranged on the first piston body, a plurality of second liquid passing channels are uniformly arranged on the second piston body, and the flow areas of the first liquid passing channels and the second liquid passing channels are larger than the maximum flow area of the channels between the liquid passing part and the inner wall of the piston cavity. The utility model discloses a mode of cancellation inner casing for maximize piston through-flow area, furthest has increased buffer capacity, has solved the problem of how to realize energy absorption's maximize.

Description

High-performance oil buffer

Technical Field

The utility model belongs to the technical field of the buffer is made, specifically a high performance oil buffer.

Background

The hydraulic buffer is an energy absorption device, the working principle of the hydraulic buffer is to convert the kinetic energy given by the external object into heat energy and release the heat energy into the atmosphere, and the hydraulic buffer has the advantages of small volume, large energy absorption, convenient installation and the like, is widely applied to the industries of automation machinery, spaceflight, war industry, automobiles and the like, can reduce the vibration and noise generated in the mechanical operation process, improves the efficiency of the machinery, increases the productivity, effectively prolongs the service life of the machinery, and reduces the maintenance cost. The oil pressure buffer products are various in types, with the development of social science and technology, the requirements of people on vibration reduction in the structure are higher and higher, the research of related aspects is also continuously advanced, and the development is very rapid from the vibration control of the structure to the vibration isolation of the structure. At present, the buffer is an energy absorption measure which can provide most convenient control for various devices.

Fig. 1 shows a conventional damper structure, which controls a damping force generated during a travel of the damper through an oil drain hole in an inner cylinder 2. In the operation process of the buffer, because the piston can move leftwards, the hydraulic oil of the inner cylinder is pressed, the hydraulic oil is discharged through the oil discharge hole in the inner cylinder, small hole damping is generated, in the movement process of the piston, the throttling hole arranged on the inner cylinder can be gradually closed by the piston, the oil discharge area can be gradually reduced, and the generated damping force is also increased. However, the buffer stability of the buffer is weak, the change linearity of the damping force is poor, and the maximization of energy absorption cannot be achieved; and because the inner cylinder exists, the area of the piston is limited, and the buffer capacity is smaller. Therefore, there is a great need for improvements and optimizations to existing hydraulic shock absorbers.

SUMMERY OF THE UTILITY MODEL

The utility model aims at prior art's shortcoming, adopt the mode of cancellation inner casing, designed a high performance hydraulic buffer for maximize piston flow area, furthest has increased buffer capacity, has solved the problem of how to realize energy absorption's maximize.

In order to solve the technical problem, the utility model discloses the technical scheme who takes does:

a high-performance oil buffer comprises a cylinder body with a piston cavity and an end cover, a piston arranged in the piston cavity, and a piston rod connected with the piston, wherein one end of the piston rod is connected with the piston, and the other end of the piston rod penetrates through the end cover and is arranged outside the cylinder body; the piston comprises an inverted-cone-shaped liquid passing part, a first piston body and a second piston body, wherein the first piston body and the second piston body are respectively located at the upper end and the lower end of the liquid passing part and are matched with the piston cavity, a plurality of first liquid passing channels are uniformly arranged on the first piston body, a plurality of second liquid passing channels are uniformly arranged on the second piston body, and the flow areas of the first liquid passing channels and the second liquid passing channels are larger than the maximum flow area of the channel between the liquid passing part and the inner wall of the piston cavity.

Preferably, a plurality of first liquid passing planes are uniformly arranged on the periphery of the first piston body, and the first liquid passing channel is defined by the first liquid passing planes and the inner wall of the piston cavity.

Preferably, a plurality of second liquid passing planes are uniformly arranged on the periphery of the second piston body, and the second liquid passing channel is defined by the second liquid passing planes and the inner wall of the piston cavity.

Preferably, the piston cavity includes a first inner cavity and a second inner cavity distributed from top to bottom, the inner diameter of the first inner cavity is larger than that of the second inner cavity, the first piston body is adapted to the first inner cavity, and the second piston body is adapted to the second inner cavity.

Preferably, a spring is connected between the piston and the bottom of the piston cavity.

Preferably, the piston is provided with a spring connecting cavity matched with the outer side of the upper part of the spring, a spring guide pillar matched with the inner side of the upper part of the spring is arranged in the spring connecting cavity, and the upper part of the spring is sleeved on the spring guide pillar.

Preferably, a stepped hole communicated with the spring connecting cavity is formed in the center of the first piston body, and a non-return steel ball is arranged in the stepped hole.

Preferably, the first piston body end is provided with a first liquid passing groove.

Preferably, the upper end of the spring guide post is provided with a positioning part matched with the spring connecting cavity, the lower end of the spring guide post is provided with a conical guide part, and the positioning part is provided with a second liquid passing groove with the depth larger than the thickness of the positioning part.

Preferably, the piston rod is installed in the cylinder body through a guide bearing, the guide bearing and an O-shaped ring and a foaming sponge are installed between the inner walls of the cylinder body, and a dustproof ring, an elastic check ring and an oil seal are installed between the guide bearing and the piston rod.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the utility model discloses a mode of cancellation inner casing has designed a high performance hydraulic buffer for maximize piston flow area, furthest has increased buffer capacity, has solved the problem of how to realize energy absorption's maximize.

2. The utility model discloses a set up the middle part of piston into big end down's back taper, form the liquid conical surface, and upper and lower both ends are respectively for gliding first piston body about piston intracavity portion, the second piston body, simultaneously at first piston body, set up first liquid passageway and second respectively on the second piston body and cross the liquid passageway, a flow of fluid when being used for the piston to remove, four first flow area sums of crossing the liquid passageway are greater than the biggest liquid area of crossing of the liquid conical surface, the flow area sum of crossing the liquid passageway of four seconds also is greater than the biggest liquid area of crossing of the liquid conical surface, thereby can guarantee that the circulation of fluid is removed control by the liquid conical surface.

3. In the utility model, when the outer end part of the piston rod is impacted by external force, the piston rod pushes the piston to move downwards to extrude hydraulic oil in the piston cavity, the hydraulic oil is pressed and then flows through the second liquid passing channel arranged on the second piston body and the annular liquid passing channel between the liquid passing conical surface and the inner wall of the piston cavity, flows out from the first liquid passing channel on the first piston body and can flow into the foaming sponge for pressure storage; along with the continuous downward motion of piston rod, the annular that passes between the liquid conical surface of passing around liquid portion a week and the piston intracavity wall passes liquid passageway area and diminishes gradually, and the damping force that produces simultaneously also corresponding increase, can the energy absorption rate increase gradually to possess better damping characteristic.

4. The utility model discloses a compare porous oily hydraulic buffer, its buffer characteristic of sap cavity is crossed to the toper more steady, and the damping force changes more linearly. In addition, by eliminating the inner cylinder, the flow area of the piston is maximized, the buffering capacity is increased to the maximum extent, and the maximization of energy absorption is realized.

Drawings

FIG. 1 is a schematic diagram of a conventional buffer;

fig. 2 is a schematic cross-sectional structure diagram of an embodiment of the present invention;

FIG. 3 isbase:Sub>A cross-sectional view taken at A-A of FIG. 2;

fig. 4 is a schematic structural diagram of a piston in an embodiment of the present invention;

fig. 5 is a schematic structural view of a guide bearing in an embodiment of the present invention;

fig. 6 is a schematic structural view of the spring guide post in the embodiment of the present invention.

Detailed Description

Referring to fig. 2 to 6, the high performance hydraulic shock absorber of the present embodiment includes a cylinder 100 having a piston chamber 110 and an end cap 120, a piston 200 disposed in the piston chamber 110, and a piston rod 300 connected to the piston 200, one end of the piston rod 300 being connected to the piston 200, the other end thereof passing through the end cap 120 and being disposed outside the cylinder 100; specifically, the piston rod 300 is installed in the cylinder 100 through the guide bearing 310, the end cap 120 is installed at the end of the cylinder 100 at the outer end of the guide bearing 310, and the piston rod 300 can slide up and down relative to the guide bearing 310 and the end cap 120; an O-ring 320 and a foaming sponge 330 are arranged between the guide bearing 310 and the inner wall of the cylinder body 100, the O-ring 320 is used for sealing between the guide bearing 310 and the inner wall of the cylinder body 100 and preventing oil leakage, an O-ring mounting groove 311 for mounting the O-ring 320 and a foaming sponge mounting groove 312 for mounting the foaming sponge 330 are arranged on the outer ring of the guide bearing 310, and the foaming sponge 330 is filled in the foaming sponge mounting groove 312 and can be used for accumulating hydraulic oil when the piston moves downwards; in addition, a dust ring 340, a circlip 350 and an oil seal 360 are installed between the guide bearing 310 and the piston rod 300, wherein the dust ring 340 is installed below the end cover 120 for isolating external dust and preventing dust from entering the piston cavity 110, the oil seal 360 is installed below the dust ring 340 for sealing between the guide bearing 310 and the piston rod 300 and preventing oil leakage, and the circlip 350 is located between the dust ring 340 and the oil seal 360.

In this embodiment, the piston 200 includes a reverse-tapered liquid passing portion 210, and a first piston body 220 and a second piston body 230 respectively located at the upper end and the lower end of the liquid passing portion 210 and adapted to the piston cavity 110, four first liquid passing channels are uniformly disposed on the first piston body 220, four second liquid passing channels 231 are uniformly disposed on the second piston body 230, and the sum of the flow areas of the four first liquid passing channels and the sum of the flow areas of the four second liquid passing channels 231 are both greater than the maximum flow area of the channel between the liquid passing portion 210 and the inner wall of the piston cavity 110. The middle part of the piston 200 is designed to be a reverse taper shape with a small lower part and a large upper part, a liquid passing conical surface is formed at the periphery of the liquid passing part 210, the upper end and the lower end of the piston are respectively provided with a first piston body 220 and a second piston body 230 which can slide up and down in the piston cavity 110, meanwhile, a first liquid passing channel and a second liquid passing channel 231 are respectively arranged on the first piston body 220 and the second piston body 230 and are used for flowing of oil liquid when the piston 200 moves, the sum of the flow areas of the four first liquid passing channels is larger than the maximum liquid passing area of the liquid passing conical surface, and the sum of the flow areas of the four second liquid passing channels 231 is also larger than the maximum liquid passing area of the liquid passing conical surface, so that the flow of the oil liquid can be controlled by the liquid passing conical surface.

When the outer end of the piston rod 300 is impacted by an external force, the piston rod 300 pushes the piston 200 to move downwards to extrude hydraulic oil in the piston cavity 110, the hydraulic oil passes through the second liquid passing channel 231 arranged on the second piston body 230 after being pressed, passes through the annular liquid passing channel between the liquid passing conical surface and the inner wall of the piston cavity 110, flows out of the first liquid passing channel on the first piston body 220, and can flow into the foaming sponge for pressure accumulation; with the continuous downward movement of the piston rod 300, the area of the annular liquid passing channel between the liquid passing conical surface surrounding the liquid passing part 210 for one circle and the inner wall of the piston cavity 110 is gradually reduced, and the generated damping force is correspondingly increased, i.e. the energy absorption rate is gradually increased, so that the piston rod has better damping characteristic. Compared with a porous oil pressure buffer, the conical liquid passing cavity has more stable buffer characteristic and more linear damping force change. In addition, by eliminating the inner cylinder, the piston flow area is maximized, and the buffering capacity is increased to the maximum extent.

In order to realize the automatic cycle operation, a spring 400 is connected between the piston 200 and the bottom of the piston chamber 110. In the process of moving the piston 200 downwards, the spring 400 is compressed and deformed, when the external force on the piston rod 300 is removed, the spring 400 pushes the piston 200 to move upwards and reset, and simultaneously drives the piston rod 300 to move upwards, and hydraulic oil flows back downwards so as to meet the next buffering action.

In order to facilitate the installation of the spring 400, a spring connecting cavity 240 adapted to the outer side of the upper portion of the spring 400 is formed in the piston 200, a spring guide pillar 410 adapted to the inner side of the upper portion of the spring 400 is formed in the spring connecting cavity 240, the upper portion of the spring 400 is sleeved on the spring guide pillar 410, and the lower end of the spring 400 is connected to the cylinder 100 at the lower end of the piston cavity 110.

Preferably, a stepped hole 222 communicating with the spring connection cavity 240 is formed in the center of the first piston body 220, and a non-return steel ball 223 is formed in the stepped hole. When the piston moves downwards, under the action of oil pressure, the check steel ball 223 blocks the stepped hole 222, hydraulic oil cannot flow upwards through the spring connecting cavity and the stepped hole, and only can flow upwards through the annular liquid passing channel and the first liquid passing channel between the second liquid passing channel 231, the liquid passing conical surface and the inner wall of the piston cavity 110, so that the damping characteristic of buffering is guaranteed. When the hydraulic oil is reset, the backflow hydraulic oil pushes the non-return steel ball 223 downwards, the stepped hole 222 is opened, and therefore the backflow channel of the hydraulic oil is increased, and backflow is accelerated.

In order to better enable the hydraulic oil to flow back, a first liquid passing groove 224 is formed at the end of the first piston body 220, a positioning portion 411 matched with the spring connecting cavity 240 is arranged at the upper end of the spring guide pillar 410, a tapered guide portion 412 is arranged at the lower end of the spring guide pillar, and a second liquid passing groove 413 with the depth larger than the thickness of the positioning portion 411 is arranged on the positioning portion 411. When the valve is reset, hydraulic oil flows back through the paths of the first liquid passing groove, the stepped hole and the second liquid passing groove 413. When the piston moves, the guide part 412 at the lower end of the spring guide column 410 can guide the radial displacement of the spring generated when the spring is compressed, and the positioning part 411 at the upper end is used for limiting the check steel ball 223 and preventing the check steel ball 223 from falling off when the piston is reset.

Preferably, four first liquid passing planes 221 are uniformly arranged on the outer periphery of the first piston body 220, and the first liquid passing channel is defined by the first liquid passing planes 221 and the inner wall of the piston cavity 110. Four second liquid passing planes 232 are uniformly arranged on the periphery of the second piston body 230, and the second liquid passing channel is defined by the second liquid passing planes 232 and the inner wall of the piston cavity 110. The arrangement is simple in structure, and the first liquid passing channel and the second liquid passing channel are easy to machine.

In order to better ensure the damping characteristic, the piston chamber 110 includes a first inner chamber 111 and a second inner chamber 112 distributed from top to bottom, the inner diameter of the first inner chamber 111 is larger than that of the second inner chamber 112, the first piston body 220 is fitted into the first inner chamber 111, and the second piston body 230 is fitted into the second inner chamber 112.

Claims (10)

1. A high-performance hydraulic shock absorber comprises a cylinder body (100) with a piston cavity (110) and an end cover (120), a piston (200) arranged in the piston cavity (110), and a piston rod (300) connected with the piston (200), wherein one end of the piston rod (300) is connected with the piston (200), and the other end of the piston rod passes through the end cover (120) and is arranged outside the cylinder body (100); the method is characterized in that: the piston (200) comprises an inverted-cone-shaped liquid passing part (210), a first piston body (220) and a second piston body (230) which are respectively positioned at the upper end and the lower end of the liquid passing part (210) and are matched with the piston cavity (110), a plurality of first liquid passing channels are uniformly arranged on the first piston body (220), a plurality of second liquid passing channels (231) are uniformly arranged on the second piston body (230), and the flow areas of the first liquid passing channels and the second liquid passing channels (231) are larger than the maximum flow area of a channel between the liquid passing part (210) and the inner wall of the piston cavity (110).

2. The high performance hydraulic shock absorber according to claim 1, wherein: the periphery of the first piston body (220) is uniformly provided with a plurality of first liquid passing planes (221), and the first liquid passing channel is defined by the first liquid passing planes (221) and the inner wall of the piston cavity (110).

3. The high performance hydraulic shock absorber according to claim 1, wherein: the periphery of the second piston body (230) is uniformly provided with a plurality of second liquid passing planes (232), and the second liquid passing channel (231) is defined by the second liquid passing planes (232) and the inner wall of the piston cavity (110).

4. The high performance hydraulic shock absorber according to claim 1, wherein: the piston cavity (110) comprises a first inner cavity (111) and a second inner cavity (112) which are distributed from top to bottom, the inner diameter of the first inner cavity (111) is larger than that of the second inner cavity (112), the first piston body (220) is matched with the first inner cavity (111), and the second piston body (230) is matched with the second inner cavity (112).

5. The high performance hydraulic shock absorber according to any one of claims 1 to 4, wherein: a spring (400) is connected between the piston (200) and the bottom of the piston cavity (110).

6. The high performance hydraulic shock absorber according to claim 5, wherein: the piston (200) is provided with a spring connecting cavity (240) matched with the outer side of the upper part of the spring (400), a spring guide post (410) matched with the inner side of the upper part of the spring (400) is arranged in the spring connecting cavity (240), and the upper part of the spring (400) is sleeved on the spring guide post (410).

7. The high performance hydraulic shock absorber according to claim 6, wherein: the center of the first piston body (220) is provided with a stepped hole (222) communicated with the spring connecting cavity (240), and a non-return steel ball (223) is arranged in the stepped hole.

8. The high performance hydraulic shock absorber according to claim 7, wherein: the end of the first piston body (220) is provided with a first liquid passing groove (224).

9. The high performance hydraulic shock absorber according to claim 7, wherein: the upper end of the spring guide post (410) is provided with a positioning part (411) matched with the spring connecting cavity (240), the lower end of the spring guide post is provided with a conical guide part (412), and the positioning part (411) is provided with a second liquid passing groove (413) with the depth larger than the thickness of the positioning part (411).

10. The high performance hydraulic shock absorber according to claim 1, wherein: piston rod (300) are installed through direction bearing (310) in cylinder body (100), direction bearing (310) with install O type circle (320) and foaming sponge (330) between cylinder body (100) inner wall, direction bearing (310) with install dust ring (340), circlip (350) and oil blanket (360) between piston rod (300).

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