TWI526637B - Buffer - Google Patents

Description

buffer

The present invention relates to a transverse type buffer.

In JP 11-344068 A, there is disclosed a damper which is a traverse type damper and has a cylindrical hood which protects the open end of the outer cylinder and the opening penetrating the outer cylinder. The protruding portion of the piston rod of the sealing member of the end is not damaged by the flying stone.

The shield disclosed in JP 11-344068 A is held at one end by a mounting bracket provided at the front end of the piston rod and the piston rod passes through the inner side, and the other end extends toward the bottom end of the outer cylinder. Further, the shield is set to have a sufficient length so that the other end portion of the shield does not expose the opening end portion of the outer tube even when the damper is in the most expanded state, and covers the outer circumference of the outer tube with a gap therebetween.

In the transverse type damper having the protective cover, the protective cover is made of metal, and when it is intended to prevent the protective cover from tilting and interfering with the outer tube, sometimes it is outside the open end of the outer tube or the outer periphery of the sealing member. Set the guide ring. If the guide ring is provided, even if the shield is inclined, the guide ring abuts against the inner circumference of the shield, thereby preventing the shield from interfering with the outer cylinder.

The guide ring is formed into a C-ring having a notch so as to be expandable during the mounting work. Therefore, when the buffer is installed, as long as the gap of the guide ring is turned downward, The gap enters the rainwater entering the inside of the shield toward the outside of the shield.

However, once the assembled buffer is assembled, it is impossible to confirm the position of the gap of the guide ring from the shield. Therefore, there may be a case where the buffer is placed in a state where the gap of the guide ring is not downward.

As a result, when the damper is installed in a place exposed to rainwater, if rainwater enters the inside of the hood, there is a possibility that rainwater cannot be discharged. Further, if the rainwater in the shield is not discharged, the opening end of the outer cylinder or the sealing member that seals the open end of the outer cylinder may be rusted.

It is an object of the present invention to provide a transverse type damper that can discharge rainwater entering the shield.

According to an aspect of the present invention, a damper is provided, the damper having: an outer cylinder having an open end; a piston rod inserted freely into the outer cylinder; and a sealing member sealing the outer portion The above-mentioned open end of the cylinder; a cylindrical protective cover covering the protruding portion of the piston rod protruding from the sealing member and the open end portion of the outer cylinder; and a guide ring disposed on the outer cylinder The outer periphery of the opening end portion or the outer circumference of the sealing member, and the outer circumference thereof faces the inner circumference of the shield; and the outer circumference of the guide ring includes a plurality of slits arranged in the circumferential direction with a space therebetween.

Hereinafter, embodiments and advantages of the present invention will be described in detail with reference to the accompanying drawings.

1‧‧‧Outer tube

1a‧‧‧Open end

2‧‧‧ piston rod

2a‧‧‧ front end

3‧‧‧ protective cover

4, 5, 6‧‧‧ guide ring

4a‧‧‧ gap

4b, 5b, 6b‧‧‧ incision

4c, 5c, 6c‧‧‧ boss

11‧‧‧ rod guide

12‧‧‧ Sealing member (ring cap)

12a‧‧‧Round groove

13‧‧‧Inner tube

21‧‧‧ mounting bracket

21a‧‧‧Flange

22‧‧‧With hexagonal bolts

B‧‧‧B

I, O‧‧‧ Space

R‧‧‧ storage area

Fig. 1A is a front longitudinal sectional view showing a buffer in a horizontal state in the embodiment.

Fig. 1B is an enlarged view of a portion B of Fig. 1A.

Figure 2 is an enlarged front elevational view of the guide ring shown in the position of the Y-Y line in Figure 1A.

Fig. 3 is a partial view showing the guide ring of Fig. 2 in an enlarged manner.

Fig. 4 is a partially enlarged plan view showing a guide ring in another modification of the embodiment.

Fig. 5 is a partially enlarged plan view showing a guide ring in another modification of the embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

The damper of the present embodiment is of a horizontal type, and is provided, for example, between railway vehicles connected in front and rear to attenuate the yaw direction in the railway vehicle. As shown in FIG. 1A, the damper of this embodiment has an outer cylinder 1, a piston rod 2, a tubular protective cover 3, and a guide ring 4.

The outer cylinder 1 is closed by welding a bottom cap at a bottom end (not shown). The open end of the outer cylinder 1 is a rod guide 11 which is fitted inside the open end 1a of the outer cylinder 1, and a ring nut which is screwed into the inner circumference of the open end 1a of the outer cylinder 1 adjacent to the rod guide 11. 12 is sealed as a sealing member.

The inner cylinder 13 is supported concentrically inside the outer cylinder 1 by a bottom cover (not shown) and the rod guide 11, and a space R is formed between the inner cylinder 13 and the outer cylinder 1. The storage area R is communicated into the inner cylinder 13 through a flow path formed on the bottom cover.

The piston rod 2 is passed through a shaft core portion of the rod guide 11 and the collar nut 12 which are provided as sealing members at the opening end portion 1a of the outer cylinder 1. A base end portion (not shown) of the piston rod 2 is inserted into the inner cylinder 13 and coupled to a piston slidably provided in the inner cylinder 13. The piston can be constructed using a well-known configuration in the damper.

Although not shown, the rod guide 11 has a passage that allows the inner cylinder 13 to communicate with the storage area R. On the other hand, the shaft core portion through which the piston rod 2 is inserted has a bushing and a seal ring. In this way, the slidability and sealing of the piston rod 2 with respect to the rod guide 11 are ensured.

The piston rod 2 protrudes toward the axial direction of the outer cylinder 1 from the sealing member of the opening end of the outer cylinder 1 to the front end portion 2a which is the left end portion in Fig. 1A. Integrated at the front end portion 2a There is a mounting bracket 21. The mounting bracket 21 has a flange portion 21a that allows it to be coupled to one end portion of the shield 3 described below.

Although not shown, a mounting bracket is also provided at the bottom end of the outer cylinder 1 to borrow The buffer can be placed at a predetermined position by the mounting bracket at the bottom end and the mounting bracket 21 of the piston rod 2.

The shield 3 is made of, for example, metal and formed in a tubular shape. Protective cover 3 is attached to The shaft core portion which is one end side portion of the left side portion in FIG. 1A is passed through the piston rod 2, and the other end side portion which is the right side portion in FIG. 1A covers the outer circumference of the outer tube 1 with a gap therebetween. The shield 3 may also be formed of a material other than metal.

Thus, the cylindrical protective cover 3 covers the piston rod 2 and the outer cylinder 1, thereby borrowing It is advantageous in that the diameter of the damper in the diameter direction is increased as compared with the case where the piston rod 2 and the outer tube 1 are covered by a rubber or resin shield made of a bellows structure which is freely stretchable.

One end of the shield 3 is held at the front end 2a of the piston rod 2. As shown in Figure 1A The shield 3 is detachably coupled to the flange portion 21a of the mounting bracket 21 provided at the distal end portion 2a by a plurality of hexagonal bolts 22.

The shield 3 is detachably coupled to the piston rod 2 for maintenance of the bumper. By removing the shield 3 from the front end portion 2a of the piston rod 2, the entire opening of the opening end portion 1a of the outer cylinder 1 and the sealing end of the outer cylinder 1 is made clear, and the opening end portion 1a can be smoothly performed. And the sealing member performs maintenance work.

Although not shown, the protective cover 3 is set to have even the most buffer In the expanded state, the other end of the shield 3 does not expose the open end 1a of the outer cylinder 1 to a sufficient length.

Thereby, the shield 3 can be protected regardless of the expansion and contraction state of the buffer. The open end portion 1a of the cylinder 1 and the protruding portion of the piston rod 2 protruding from the sealing member are not damaged by flying stones.

As shown in FIG. 2, the guide ring 4 is formed into a C-ring having a notch 4a so that It can be expanded. Since the guide ring 4 is formed of a fluororesin, the frictional resistance with the shield 3 is small, and even if it comes into contact with the shield 3, the expansion and contraction of the damper is not lowered.

The component shown by a one-dot chain line in Fig. 2 is a shield 3. A gap is provided between the inner circumference of the shield 3 and the outer circumference of the guide ring 4, and even if the shield 3 is inclined, the guide ring 4 abuts against the inner circumference of the shield 3, thereby preventing the shield 3 from interfering with the outer cylinder 1 .

The guide ring 4 may be formed of another material instead of the fluororesin as long as it does not interfere with the relative movement between the shield 3 and the guide ring 4 when it comes into contact with the shield 3.

The guide ring 4 has a notch 4a in the embodiment of the present invention, but the guide ring 4 may be formed in a ring shape without the notch 4a.

In the present embodiment, a plurality of slits 4b are provided on the outer circumference of the guide ring 4 at equal intervals in the circumferential direction. Thereby, the slit 4b forms a flow path, thereby allowing communication between one side of the inner side of the shield 3 which is divided by the guide ring 4 in the axial direction and the other side. In other words, the slit 4b allows the inside of the shield 3 to be the one space 1 around the piston rod 2 and the inside of the shield 3 to be the other side space O around the outer cylinder 1.

The guide ring 4 has a boss portion 4c between the slits 4b. The outer periphery of the boss portion 4c faces the inner circumference of the shield 3. Therefore, in the guide ring 4, even if the inner circumference of the shield 3 is in sliding contact with the outer circumference of the guide ring 4, the flow path of the slit 4b can be secured by the contact of the boss portion 4c with the inner circumference of the shield 3 area.

As described above, the guide ring 4 in the present embodiment may have a plurality of slits 4b in the entire circumference, and may allow the one side space I of the shield 3 to communicate with the other side space O. Further, the guide ring 4 only needs to have the boss portion 4c to secure the sliding contact of the shield 3. In this range, the shape of the slit 4b and the boss portion 4c can be arbitrarily set.

For example, in the guide ring 5 shown in Fig. 4, the bottom surface of the slit 5b is curved in a concave shape, and the outer end surface of the boss portion 5c is a straight line. Further, in the guide ring 6 shown in Fig. 5, the bottom surface of the slit 6b is a straight line, whereas the outer end surface of the boss portion 6c is curved in a convex shape. And, although not shown, However, the bottom surface of the slit may be curved in a concave shape and the end surface of the boss portion may be convexly curved.

As shown in Fig. 2, the width dimension of the slit 4b in the circumferential direction is substantially the same as the width dimension of the adjacent boss portion 4c in the circumferential direction. Alternatively, the width of the slit 4b may be made larger than the width of the boss portion 4c to ensure the flow path area as large as possible, or the boss portion 4c may be formed in a rib shape along the axial direction of the shield 3 at an arbitrary angular interval. It is disposed in the circumferential direction of the guide ring 4.

The sum of the circumferential lengths of the slits 4b is preferably larger than the sum of the circumferential lengths of the boss portions 4c, and the slits 4b may not be equally spaced. Regarding the formation of the guide ring 4, any method can be selected. For example, it is preferable that a plurality of grooves in the axial direction are formed on the outer circumference of the cylindrical material formed to have an arbitrary length, and then cut in the longitudinal direction to form a desired shape.

As shown in FIGS. 3, 4, and 5, the depths of the slits 4b, 5b, and 6b, that is, the bottom faces of the slits 4b, 5b, and 6b can protrude toward the shield 3 side from the outer peripheral surface of the outer cylinder 1. In this case, even if the boss portions 4c, 5c, and 6c are worn, the shield 3 can be prevented from contacting the outer cylinder 1.

Further, as shown in Figs. 4 and 5, even if the boss portions 5c and 6c are worn, the contact area with the shield 3 is increased, so that the surface pressure can be lowered, and further wear of the boss portions 5c and 6c can be suppressed. Further, as shown in Fig. 5, even if the boss portion 6c is worn, the reduction in the flow path area on the slit 6b can be suppressed to be small, and the drainage of the rainwater is not excessively hindered.

In the present embodiment, the guide ring 4 is provided on the outer circumference of the opening end portion 1a of the outer cylinder 1 or the outer circumference of the sealing member. As shown, the guide ring 4 is disposed on the outer circumference of the ring head nut 12 forming the sealing member.

When the sealing member is formed in a state in which the rod guide 11 and the ring head nut 12 are integrated, the guide ring 4 may be disposed on the outer circumference of the ring nut portion or may be disposed on the outer circumference of the rod guide portion.

As shown in FIG. 1B, the guide ring 4 is fitted into the annular groove 12a which is a groove portion formed on the outer circumference of the ring head nut 12. Thereby, the first snail can be pre-embedded with the guide ring 4 The cap 12 is screwed into the open end 1a of the outer cylinder 1, and the guide ring 4 is placed at a desired position.

In the present embodiment, the guide ring 4 is provided on the outer circumference of the ring head nut 12, that is, the outer circumference of the sealing member. Although not shown, the guide ring 4 may be provided on the outer circumference of the opening end portion 1a of the outer cylinder 1 instead. For example, when the outer circumference of the ring head nut 12 is further recessed from the outer periphery of the opening end portion 1a of the outer tube 1, it is preferable to provide the guide ring 4 to the outer periphery of the opening end portion 1a of the outer tube 1.

When the guide ring 4 is disposed on the outer circumference of the ring head nut 12, since the ring head nut 12 or the rod guide 11 has a sufficient wall thickness, the guide ring 4 is disposed at the open end portion 1a of the outer tube 1. In the case of the outer circumference, it is advantageous in terms of forming the annular groove 12a as the groove portion in which the guide ring 4 is fitted.

Further, the guide ring 4 in the present embodiment is provided on the opening end portion 1a of the outer cylinder 1 or the sealing member. Therefore, in the conventional traverse type damper having the protective cover 3, the outer periphery of the opening end portion 1a of the outer tube 1 or the outer circumference of the sealing member can be provided by providing the groove portion or even if the groove portion is not provided. A guide ring 4 is provided.

As described above, in the damper according to the present embodiment, since the outer circumference of the guide ring 4 includes a plurality of slits 4b arranged in the circumferential direction with a space therebetween, the guide ring 4 on the inner side of the shield 3 has a plurality of slits 4b. A slit 4b disposed downward is present. Therefore, it is possible to discharge the rainwater entering the inside of the shield 3 by the flow path formed by the downward slit 4b.

As a result, in the case where the horizontal type damper is provided in a place exposed to rainwater, even if rainwater enters the inside of the cylindrical protective cover 3, it can be formed by the slit formed in the guide ring 4. 4b discharges rainwater.

Further, since the slit 4b formed in the guide ring 4 allows the side of the inner side of the shield 3 which is divided by the guide ring 4 in the axial direction to communicate with the other side, the inner side of the shield 3 can be made breathable. Sex becomes good. Further, it is also possible to suppress the opening end portion 1a of the outer tube 1 or the sealing member from being rusted by rain.

Although the embodiment of the present invention has been described above, the above embodiment is only a part of the application example of the present invention, and the technical scope of the present invention is not limited to the specific configuration of the above embodiment.

The present application claims the priority of Japanese Patent Application No. 2012-149201, filed on Jan.

The exclusive nature or features contained in the embodiments of the invention are as set forth below.

3‧‧‧ protective cover

4‧‧‧Guide ring

4a‧‧‧ gap

4b‧‧‧ incision

4c‧‧‧Boss

Claims (8)

A transverse type buffer comprising: an outer cylinder having an open end; a piston rod inserted freely into the outer cylinder; a sealing member sealing the open end of the outer cylinder; a cylindrical shape a shield covering the protruding portion of the piston rod protruding from the sealing member and the open end of the outer cylinder; and a guide ring disposed at an outer circumference of the open end of the outer cylinder or an outer circumference of the sealing member The outer circumference of the guide ring is opposed to the inner circumference of the shield, and the outer circumference of the guide ring has a plurality of slits arranged in the circumferential direction with a gap therebetween. The transverse type damper according to claim 1, wherein the guide ring has a boss portion whose outer periphery faces the inner circumference of the shield between the adjacent slits. The transverse type damper according to claim 1 or 2, wherein the guide ring is provided on the outer circumference of the opening end or in a groove portion formed on the outer circumference of the sealing member. The transverse type damper of claim 1 or 2, wherein the sealing member has a ring nut screwed into the open end of the outer tube; the guide ring is disposed at the ring head The outer circumference of the nut. The transverse type damper of claim 4, wherein the guide ring is disposed in a groove portion formed on an outer circumference of the ring head nut. The transverse type damper according to claim 1 or 2, wherein the bottom surface of the slit protrudes toward the shield side from the outer circumferential surface of the outer cylinder or the outer circumferential surface of the sealing member. The transverse type damper of claim 1 or 2, wherein the bottom surface of the slit is curved in a concave shape. The transverse type damper of claim 2, wherein the outer end surface of the boss portion is convexly curved.