TW201525326A - Hydraulic cylinder shock absorbing device - Google Patents

Abstract

A hydraulic cylinder shock absorbing device is provided with an outer cylinder body and a piston rod. One end of the piston rod is disposed inside the outer cylinder body and provided with a piston. The piston is provided with an engaging portion and a flow portion. The engaging portion is provided with an engaging groove, a ball groove, a plurality of side pressure-relief holes, a pressure relief ball, and an elastic element. The flow portion is formed at one end where the engaging portion is provided with the ball groove, and is provided with a receiving groove, an oil stop ring, a central groove, a plurality of first oil guide hold, and a plurality of second oil guide hole. The receiving groove is disposed at the outer surface of the flow portion, such that a first flange and a second flange are respectively formed at two sides of the receiving groove. Each first oil guide hole penetrates through the first flange and is communicated with the receiving groove. Each second oil guide hole penetrates through the second flange and is communicated with the receiving groove. Thereby, a hydraulic cylinder shock absorbing device capable of absorbing shock phenomenon is provided.

Description

Hydraulic cylinder shock absorber

The invention relates to a hydraulic cylinder shock absorbing device, in particular to a hydraulic cylinder shock absorbing device capable of mitigating impact phenomena.

The existing hydraulic cylinder buffer device is mainly provided with an outer cylinder body and a piston rod, wherein the outer cylinder body is a hollow tubular body and stores a hydraulic oil inside, and one end of the piston rod is slidably disposed outside the piston cylinder. a piston is disposed in the cylinder, and an outer diameter of the piston is smaller than an inner diameter of the outer cylinder, so that hydraulic oil in the outer cylinder flows through the piston on opposite sides of the piston, when the piston rod is opposite to the outer cylinder When the body moves, the hydraulic oil will flow through the piston, and the hydraulic pressure generated by the hydraulic oil flowing through the piston can provide a buffering effect of the piston rod, wherein the existing piston is mainly disposed at the middle portion and has a receiving groove in the annular recess. An oil retaining ring that can be abutted against the inner surface of the outer cylinder is disposed in the receiving groove, and the piston is further provided with a plurality of guides communicating with the receiving groove on opposite sides of the receiving groove. The oil hole, wherein the inner diameter of the oil guiding hole on both sides of the receiving groove is different, so that the hydraulic oil can flow in the oil guiding hole of different inner diameter, thereby making the piston rod different in different moving directions. Speed to reach one Buffering function;

However, the existing hydraulic cylinder buffer device can be installed on a rail, thereby providing a buffer effect of the door panel through the piston rod, but only applicable to the hydraulic oil in the outer cylinder when the piston rod is subjected to a small external force. It can smoothly flow between the oil guide holes of different inner diameters, but when the piston rod is subjected to a large external force, the hydraulic oil cannot flow from the small inner diameter oil guide hole to the large inner diameter oil guide hole in a short time. Because the hydraulic oil cannot flow smoothly, the moving speed of the piston rod and the speed of the door panel cause an excessive drop, and the door panel is strongly vibrated due to the rapid decrease of the speed of the door panel, that is, when the piston rod is subjected to a large external force. Therefore, the existing hydraulic cylinder buffer device cannot effectively provide the buffer rod as a buffering effect, and therefore, there is an improvement in the technology of the existing hydraulic cylinder buffer device.

In order to solve the problem that the existing hydraulic cylinder buffer device is subjected to a large external force, the hydraulic oil cannot flow smoothly, and the speed of the piston rod and the door panel is excessively large, and the lack of the cushioning effect of the door panel cannot be effectively provided through the piston rod. The present invention provides a hydraulic cylinder shock absorbing device which can smoothly flow hydraulic oil to the other side of the piston via other passages when the hydraulic shock absorber is subjected to a large external force, and automatically when the external force is lowered. The channel is closed to effectively avoid the vibration of the door panel when the speed difference between the piston rod speed and the door panel is too large, so as to effectively provide the buffering effect of the door panel.

Based on the foregoing objects, the technical means utilized by the present invention is to provide a hydraulic cylinder shock absorbing device which is provided with an outer cylinder and a piston rod, wherein:

The outer cylinder is a hollow tubular body and has an opening at one end;

One end of the piston rod extends through the opening and is disposed in the outer cylinder body, and a piston is disposed on the end. The piston is provided with a joint portion and a flow portion. The joint portion is combined with the piston rod and is provided with a combination. a slot, a ball slot, a plurality of side pressure relief holes, a pressure relief ball and an elastic element, the coupling groove is axially recessed in the joint portion and combined with the piston rod, the ball groove is axially recessed in the The other end of the joint portion is in communication with the joint groove, and the pressure relief holes are radially and spaced apart from the outer surface of the joint portion and communicate with the ball groove. The pressure relief ball is disposed in the ball groove and on each side Between the pressure relief holes, the elastic member is disposed in the ball groove and abuts against the pressure releasing ball and the piston rod, so that the pressure releasing ball is opposite to each side pressure releasing hole;

The flow portion is formed at one end of the joint portion and having an outer diameter larger than an outer diameter of the joint portion. The flow portion is provided with a receiving groove, an oil stop ring, a center groove, and a plurality of first oil guiding holes. And a plurality of second oil guiding holes, the receiving groove is annularly recessed on the outer surface of the middle portion of the flow portion, so that the flow portion forms a first flange and a second convex portion respectively on two sides of the receiving groove a first flange is adjacent to each side of the pressure relief hole of the joint portion, the oil stop ring is sleeved in the receiving groove and abuts against the inner surface of the outer cylinder body, and is movable with the first protrusion The edge or the second flange abuts, the central groove extends axially through the flow portion and can communicate with each side of the pressure relief hole via movement of the pressure relief ball, wherein the pressure relief ball is pushed through the elastic element The passage between the central groove and each side of the pressure relief hole is closed, and the pressure relief ball is opposite to the pressure relief holes on each side. When the hydraulic oil flows out from the central groove and contacts the pressure relief ball, it is directly released from each side. The hole flows out, so that the hydraulic oil does not flow through the surface of the pressure relief ball in the ball groove and then flows out from the pressure relief holes on each side, so as to avoid the rapid vibration of the pressure relief ball. Noise, each of the first oil guiding holes penetrates the first flange radially and at intervals to communicate with the receiving groove, and each of the second oil guiding holes penetrates the second flange radially and at intervals and communicates with the receiving groove Each of the second oil guiding holes has a different inner diameter from each of the first oil guiding holes.

Further, the inner diameter of each of the second oil guiding holes is larger than the inner diameter of each of the first oil guiding holes.

Further, the outer cylinder is provided with an oil seal near the opening, and one end of the piston rod extends in the outer cylinder through the opening of the outer cylinder and the oil seal.

Preferably, the outer cylinder is provided with a joint at the other end.

Preferably, the outer surface of one end of the piston rod extending into the outer cylinder body is provided with an external thread, and the coupling groove of the joint portion is provided with an internal thread on the inner surface which is screwed with the external thread of the piston rod.

Preferably, the pressure-relieving ball is located in the ball groove and resists the central groove, thereby closing a passage between the central groove and each side pressure-relief hole, and the elastic element is located between the pressure-reducing ball and the piston rod.

By the above technical means, the hydraulic cylinder shock absorbing device of the present invention has at least the following advantages and effects:

1. Smooth flow of hydraulic oil: The hydraulic cylinder impact buffer device of the present invention allows the piston rod to be subjected to a structure such as an oil guiding hole, a receiving groove, a center groove, a pressure releasing ball, and a side pressure releasing hole on the piston. The small external force can flow through the oil guiding hole and the receiving groove, and at a large external force, the oil can flow through the oil guiding hole, the receiving groove, the center groove and the side pressure releasing hole at the same time, so that the hydraulic oil in the outer cylinder body smoothly flows. Flow to provide the cushioning effect required for the door panel.

2. Mitigating the impact phenomenon: when the piston rod is subjected to a relatively large external force and relatively moves toward the outer cylinder body, the hydraulic oil located on the side of the piston flow portion may pass through each of the second oil guiding holes, the receiving groove and each The first oil guiding hole flows to one side of the piston joint portion, and can also flow to the joint portion side of the piston through the center groove and each side pressure releasing hole, without being hydraulically affected as the existing hydraulic cylinder buffer device The oil does not flow smoothly, and the speed difference between the piston rod and the door panel is too large, which causes the door panel to vibrate strongly.

In order to understand the technical features and practical effects of the present invention in detail, and in accordance with the contents of the specification, the following is further described in detail with reference to the preferred embodiments shown in the drawings, as illustrated in FIGS. An embodiment of the hydraulic cylinder shock absorbing device of the present invention, the hydraulic cylinder shock absorbing device is provided with an outer cylinder 10 and a piston rod 20, wherein:

The outer cylinder block 10 is a hollow pipe body. One end of the outer cylinder block 10 is provided with a joint head 11, and the other end of the outer cylinder block 10 is provided with an opening 12. Further, the outer cylinder block 10 is close to An oil seal 13 is disposed at the opening 12;

One end of the piston rod 20 extends through the opening 12 and the oil seal 13 in the outer cylinder block 10 and is provided with a piston 30 at the end. Preferably, the piston rod 20 extends into one end of the outer cylinder block 10. The outer surface is provided with an external thread 21, and the piston 30 is provided with a joint portion 31 and a flow portion 32. The joint portion 31 is combined with the piston rod 20 and is provided with a coupling groove 311, a ball groove 312, and a plurality of side pressure reliefs. a hole 313, a pressure relief ball 314 and an elastic element 315, wherein the coupling groove 311 is axially recessed in the joint portion 31 and combined with the piston rod 20. Further, the coupling groove 311 is provided on the inner surface. The external thread 21 of the piston rod 20 is screwed into the internal thread 316, and the ball groove 312 is axially recessed at the other end of the joint portion 31 and communicates with the coupling groove 311. The side pressure relief holes 313 are radially and spaced apart. The ball is disposed on the outer surface of the joint portion 31 and communicates with the ball slot 312. The pressure relief ball 314 is disposed in the ball slot 312 and is disposed between the side pressure relief holes 313. The elastic element 315 is disposed in the ball slot. 312 is in contact with the pressure releasing ball 314 and the piston rod 20, and the pressure releasing ball 314 is opposite to each side pressure releasing hole 313;

The flow portion 32 is formed at one end of the joint portion 31 where the ball groove 312 is disposed and has an outer diameter larger than the outer diameter of the joint portion 31. The flow portion 32 is provided with a receiving groove 321 , an oil stop ring 322 , and a center groove 323 . a plurality of first oil guiding holes 324 and a plurality of second oil guiding holes 325, wherein the receiving groove 321 is annularly recessed on the outer surface of the middle portion of the flow portion 32, so that the flow portion 32 is in the receiving groove 321 A first flange 326 and a second flange 327 are formed on the two sides of the joint portion 31. The first flange 326 is adjacent to each side of the pressure relief hole 313 of the joint portion 31. The oil stop ring 322 is sleeved on the flow portion. The receiving groove 321 of the 32 is in contact with the inner surface of the outer cylinder 10 and can abut the first flange 326 or the second flange 327 so as to be stored in the outer cylinder 10 The hydraulic oil can flow at both ends of the piston 30. The central groove 323 extends axially through the flow portion 32 and is disposed coaxially with the flow portion 32, so that the central groove 323 can move through the pressure releasing ball 314. The pressure relief ball 314 is in contact with each side of the pressure relief hole 313, and the passage between the center groove 323 and each side pressure relief hole 313 is closed by the pressure release ball 314. The oil hole 324 extends through the first flange 326 and communicates with the receiving groove 321 in a radial direction, and the second oil guiding holes 325 penetrate the second flange 327 radially and at intervals and the receiving groove The 321 is communicated, wherein the inner diameter of each of the second oil guiding holes 325 is larger than the inner diameter of each of the first oil guiding holes 324. Further, between the two flanges 326, 327 and the inner surface of the outer cylinder 10, respectively, as shown in FIG. There is a gap, and the structural relationship between the pressure releasing ball 314 and each side pressure releasing hole 313 is directly discharged from each side when the hydraulic oil flows out from the center groove 323 and contacts the pressure releasing ball 314. The hydraulic oil does not flow through the surface of the pressure relief ball 314 in the ball slot 312 and then flows out from the pressure relief holes 313 of each side to avoid noise generated by the rapid vibration of the pressure relief ball 314.

When the hydraulic cylinder shock absorbing device of the present invention is used, please refer to FIG. 4, wherein when the piston rod 20 is pulled outward relative to the outer cylinder 10, the piston 30 will oppose the piston rod 20 The cylinder block 10 slides, and the oil retaining ring 322 located in the receiving groove 321 abuts against the inner surface of the outer cylinder 10 and abuts against the second flange 327 of the flow portion 32 to be located at the piston. The hydraulic oil on the side of the joint portion 31 passes through each of the first oil guiding holes 324, the gap between the first flange 326 and the inner surface of the outer cylinder 10, the receiving groove 321 and each of the second oil guiding holes 325. Flowing to one side of the flow portion 32 of the piston 30, wherein the piston rod 20 is pulled outward relative to the outer cylinder 10 because the inner diameter of each of the second oil guiding holes 325 is larger than the inner diameter of each of the first oil guiding holes 324 When it is discharged, the hydraulic oil quickly flows from the side of the joint portion 31 of the piston 30 to the side of the flow portion 32.

Referring to FIG. 5, when the piston rod 20 is moved toward the inside of the outer cylinder 10 by a small external force, the piston 30 slides relative to the outer cylinder 10 along with the piston rod 20. At this time, The oil stop ring 322 located in the receiving groove 321 abuts against the inner surface of the outer cylinder 10 and abuts against the first flange 326 of the flow portion 32 so as to be located on the side of the flow portion 32 of the piston 30. The hydraulic oil flows to the piston 30 via the second oil guiding hole 325, the gap between the second flange 327 and the inner surface of the outer cylinder 10, the receiving groove 321 and the first oil guiding holes 324. On one side of the portion 31, when the piston rod 20 is retracted inwardly relative to the outer cylinder 10, hydraulic oil flows slowly from the side of the flow portion 32 of the piston 30 to the side of the joint portion 31, wherein The hydraulic oil flows from each of the second oil guiding holes 325 having a large inner diameter to the first oil guiding holes 324 of the small inner diameter. Therefore, the hydraulic oil generates a hydraulic pressure to provide a buffering effect of the piston rod 20.

In addition, when the piston rod 20 is subjected to a large external force and moves toward the inside of the outer cylinder 10 as shown in FIG. 6, the piston 30 slides relative to the outer cylinder 10 along with the piston rod 20. The oil retaining ring 322 in the receiving groove 321 abuts against the inner surface of the outer cylinder 10 and abuts against the first flange 326 of the flow portion 32, so that the hydraulic pressure on the side of the flow portion 32 of the piston 30 The oil flows to the side of the joint portion 31 of the piston 30 via the second oil guiding holes 325, the receiving groove 321 and the first oil guiding holes 324, so that the piston rod 20 faces the outer cylinder 10 When retracting, the hydraulic oil flows from the side of the flow portion 32 of the piston 30 to the side of the joint portion 31, wherein the external force is excessively large, so that the second oil guide hole 325 and the second flange 327 are originally passed. The gap between the inner surfaces of the outer cylinder 10, the receiving groove 321 and the hydraulic oil flowing through the respective first oil guiding holes 324 are insufficient to reduce the pressure of the external force, and the excess pressure can push the hydraulic oil through the center groove 323. The pressure releasing ball 314 moves toward the piston rod 20 to compress the elastic member 315, and the central groove 323 communicates with each side pressure releasing hole 313. At the time of the flow portion 32, the hydraulic oil may flow to the joint portion 31 side of the piston 30 via the center groove 323 and the respective pressure relief holes 313, and thus the flow portion 32 of the piston 30 is located. The hydraulic oil on the side can be flown not only to the second oil guiding hole 325, the receiving groove 321 and the first oil guiding holes 324 to the joint portion 31 side of the piston 30, but also through the central groove 323 and the pressure relief on each side. The hole 313 flows to the side of the joint portion 31 of the piston 30. When the pressure is reduced to a certain extent, the compressed elastic member 315 pushes the pressure releasing ball 314 back to the initial position, thereby automatically closing the center groove 323 and each The passage between the side pressure relief holes 313, therefore, when the piston rod 20 of the present invention receives a large external force, the hydraulic oil not only smoothly flows in the outer cylinder block 10, but also provides a door panel-buffer via the piston rod 20. The effect is not that the existing hydraulic cylinder buffer device cannot smoothly flow due to the hydraulic oil, so that the speed difference between the piston rod 20 and the door panel is too large, resulting in strong vibration of the door panel.

The above is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any one of ordinary skill in the art can use the present invention without departing from the scope of the present invention. Equivalent embodiments of the invention may be made without departing from the technical scope of the present invention.

10‧‧‧Outer cylinder
11‧‧‧Combined head
12‧‧‧ Opening
13‧‧‧ oil seal
20‧‧‧ piston rod
21‧‧‧ external thread
30‧‧‧Piston
31‧‧‧Combination
311‧‧‧ joint slot
312‧‧‧ ball slot
313‧‧‧ Side pressure relief hole
314‧‧‧Relief ball
315‧‧‧Flexible components
316‧‧‧ internal thread
32‧‧‧Mobile Department
321‧‧‧ 容 槽
322‧‧‧ oil ring
323‧‧‧Center slot
324‧‧‧First oil guiding hole
325‧‧‧Second oil guiding hole
326‧‧‧First flange
327‧‧‧second flange

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a perspective view showing the appearance of the present invention. Figure 2 is a cross-sectional side view of the present invention. Figure 3 is a partially enlarged cross-sectional side view of the present invention. Figure 4 is a side view showing the flow of hydraulic oil when the piston rod of the present invention is pulled relative to the outer cylinder. Fig. 5 is a side view showing the flow of hydraulic oil when the piston rod of the present invention is moved by a small external force while moving relative to the outer cylinder. Fig. 6 is a side view showing the flow of hydraulic oil when the piston rod of the present invention is moved by a relatively large external force while moving relative to the outer cylinder.

10‧‧‧Outer cylinder

20‧‧‧ piston rod

31‧‧‧Combination

311‧‧‧ joint slot

312‧‧‧ ball slot

313‧‧‧ Side pressure relief hole

314‧‧‧Relief ball

315‧‧‧Flexible components

316‧‧‧ internal thread

32‧‧‧Mobile Department

321‧‧‧ 容 槽

322‧‧‧ oil ring

323‧‧‧Center slot

324‧‧‧First oil guiding hole

325‧‧‧Second oil guiding hole

326‧‧‧First flange

327‧‧‧second flange

Claims (10)

A hydraulic cylinder impact buffer device is provided with an outer cylinder body and a piston rod, wherein: the outer cylinder body is a hollow tubular body and has an opening at one end; one end of the piston rod extends through the opening a piston is disposed on the outer cylinder, and the piston is provided with a joint portion and a flow portion. The joint portion is combined with the piston rod and is provided with a coupling groove, a ball groove, and a plurality of side pressure relief holes. a pressure releasing ball and an elastic member, the coupling groove is axially recessed in the joint portion and combined with the piston rod, the ball groove is axially recessed at the other end of the joint portion and communicates with the joint groove, each The side pressure relief holes are radially and spaced apart from the outer surface of the joint portion and communicate with the ball groove. The pressure relief ball is disposed in the ball groove and is disposed between the side pressure relief holes, and the elastic element is disposed on the ball And abutting the pressure-reducing ball and the piston rod, the pressure-reducing ball is opposite to each of the pressure-relieving holes; and the flow portion is formed at one end of the joint portion where the ball groove is provided and the outer diameter is larger than the joint portion The outer diameter of the flow portion is provided with a receiving groove, an oil stop ring, a center groove, and a plurality of first oil guides a hole and a plurality of second oil guiding holes, wherein the receiving groove is annularly disposed on an outer surface of the middle portion of the flow portion, so that the flow portion forms a first flange and a second portion respectively on both sides of the receiving groove a flange, the first flange is adjacent to each side of the pressure relief hole of the joint portion, the oil stop ring is sleeved in the receiving groove and abuts against the inner surface of the outer cylinder body, and is compatible with the first a flange or the second flange abutting, the central groove axially penetrating the flow portion and capable of communicating with the respective pressure relief holes via movement of the pressure relief ball, wherein the pressure relief ball is pushed by the elastic member Abutting, the passage between the central groove and each of the pressure relief holes is closed, and each of the first oil guiding holes penetrates the first flange radially and at intervals to communicate with the receiving groove, and each of the second oil guiding holes is radial and The second flange is inserted through the second flange and communicates with the receiving groove, wherein each of the second oil guiding holes has a different inner diameter from each of the first oil guiding holes. The hydraulic cylinder shock absorbing device according to claim 1, wherein an inner diameter of each of the second oil guiding holes is larger than an inner diameter of each of the first oil guiding holes. The hydraulic cylinder shock absorbing device of claim 2, wherein the outer cylinder is provided with an oil seal near the opening, and one end of the piston rod extends through the opening of the outer cylinder and the oil seal. Inside the cylinder. A hydraulic cylinder shock absorbing device according to claim 3, wherein the outer cylinder is provided with a joint at the other end. The hydraulic cylinder impact buffer device of claim 4, wherein the outer surface of one end of the piston rod extending into the outer cylinder body is provided with an external thread, and the coupling groove of the joint portion is provided on the inner surface with an external thread of the piston rod. Threaded internal thread. The hydraulic cylinder shock absorbing device according to claim 5, wherein the pressure releasing ball is located in the ball groove and resists the center groove, thereby closing a passage between the center groove and each side pressure releasing hole, wherein the elastic element is located Between the pressure relief ball and the piston rod. The hydraulic cylinder impact buffer device of claim 1, wherein the outer cylinder body is provided with an oil seal near the opening, and one end of the piston rod extends through the opening of the outer cylinder body and the oil seal. Inside the cylinder. A hydraulic cylinder shock absorbing device according to claim 1 or 2, wherein the outer cylinder is provided with a joint at the other end. The hydraulic cylinder impact buffer device according to 2 or 3, wherein an outer thread of the piston rod extending into one end of the outer cylinder body is provided with an external thread, and the coupling groove of the joint portion is provided on the inner surface with a screw threaded with the external thread of the piston rod. Internal thread. The hydraulic cylinder shock absorbing device according to any one of claims 1 to 4, wherein the pressure releasing ball is located in the ball groove and resists the center groove, thereby closing a passage between the center groove and each side pressure releasing hole. The elastic element is located between the pressure relief ball and the piston rod.