CN111051729B

CN111051729B - Buffer device

Info

Publication number: CN111051729B
Application number: CN201880057231.2A
Authority: CN
Inventors: 勇井理
Original assignee: KYB Motorcycle Suspension Co Ltd
Current assignee: KYB Motorcycle Suspension Co Ltd
Priority date: 2017-09-14
Filing date: 2018-09-05
Publication date: 2022-06-03
Anticipated expiration: 2038-09-05
Also published as: JP2019052671A; WO2019054251A1; JP7037307B2; CN111051729A

Abstract

The invention provides a damper, which comprises a damper main body (4) having a rod (3) movably inserted into a cylinder (1) and provided with a bracket (2) at a protruding side end protruding from the cylinder (1); a suspension spring (S) that is disposed on the outer periphery of the damper main body (4) and that biases the damper main body (4) in the extension direction; a cushion rubber (5) that is mounted so as to be movable in the axial direction with respect to the outer periphery of the rod (3); and a split washer (6) which is a restricting member that can be attached between the bracket (2) and the cushion rubber (5) in the rod (3) from the outer periphery of the rod (3) and restricts the cushion rubber (5) from moving in the opposite direction to the cylinder, the cushion rubber (5) and the split washer (5) being urged to the opposite side of the cylinder by a suspension spring (S).

Description

Buffer device

Technical Field

The present invention relates to a buffer.

Technical Field

A conventional damper, for example, described in japanese patent JP2011-002058A, JP2013-072455A, includes a cylinder; a rod movably inserted into the cylinder and having a bracket at a base end that is connectable to a body side or a wheel side of a vehicle; a piston located at a front end of the rod; a damper main body having a rod guide that is press-fitted to a rod-side end portion of the cylinder and supports the rod; and a cushion rubber provided on the base end side of the rod, and configured such that a cylindrical spacer is attached between the bracket and the cushion rubber to shorten the stroke of the rod.

Disclosure of Invention

In such a bumper, even when the bumper is in the most elongated state, the distance between the cushion rubber and the bumper main body is reduced. Therefore, even if the rod is inserted into the cylinder and the rod guide is pushed in with the cushion rubber or the spacer assembled on the outer periphery of the rod in advance, a space for placing a jig for pushing in the rod guide cannot be secured, and assembling of the shock absorber becomes difficult.

Therefore, there is a method as described in japanese patent JP2013-072455A, that is, in order to be able to fasten the bracket to the rod with a screw, the bumper body is first completed, then the cushion rubber and the spacer are assembled from the base end side of the rod, and finally the bracket is fixed with a screw, thereby assembling the bumper.

However, since the screw-fastening requires a processing cost, it is required to fix the bracket to the rod by welding which is cheaper than the screw-fastening.

However, as in the case of fastening the bracket to the rod with a screw, a cushion rubber or a spacer is mounted on the rod after the completion of the bumper body, and finally, when it is desired to weld the bracket, a gap for placing the electrode for resistance welding cannot be secured. Therefore, when the bracket is welded and fixed to the rod, it is necessary to assemble the damper main body in a state where the bracket is welded after the cushion rubber or the spacer is attached to the rod in advance.

Therefore, an object of the present invention is to provide a shock absorber that can be easily assembled even when the stroke of the rod is set short and the bracket is welded and fixed to the rod.

The buffer of the present invention comprises: a damper main body having a rod movably inserted into a cylinder and provided with a bracket at a protruding side end portion protruding from the cylinder; a suspension spring disposed on an outer periphery of the damper main body and biasing the damper main body in an extending direction; a cushion rubber mounted movably in an axial direction with respect to an outer periphery of the rod; and a restricting member that is capable of being fitted between the bracket and the cushion rubber in the rod from an outer periphery of the rod and restricts the cushion rubber from moving in a direction opposite to a cylinder, the cushion rubber and the restricting member being urged to an opposite side of the cylinder by the suspension spring.

Drawings

Fig. 1 is a longitudinal sectional view illustrating a shock absorber according to the present embodiment.

FIG. 2 is an end view of the X-X cut portion of FIG. 1.

Fig. 3 is an enlarged longitudinal sectional view of a part of a state before the restriction member of fig. 1 is mounted.

Fig. 4 is an end view showing a cut portion when the regulating member of fig. 2 is an opening gasket.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Like reference numerals designate corresponding parts throughout the several views.

The shock absorber D of the present embodiment includes a shock absorber main body 4 having a cylinder 1 and a rod 3 movably inserted into the cylinder 1 and having a bracket 2 provided on a side of a protruding side end portion protruding from the cylinder 1; a suspension spring S disposed on an outer periphery of the damper main body 4 and urging the damper main body 4 in an extending direction; a cushion rubber 5 mounted on the outer periphery of the rod 3 so as to be movable in the axial direction; and a partition pad 6 as a restricting member which is installed between the one side bracket 2 of the rod 3 and the cushion rubber 5 and restricts the cushion rubber 5 from moving in the opposite direction of the cylinder.

As shown in fig. 1, the damper main body 4 includes: a bottomed cylindrical cylinder 1; a rod 3 which can be freely inserted into and out of the cylinder 1; a rod guide 7 mounted on an open end portion of the cylinder 1 and shaft-supporting the rod 3; a cap 10 sealing an opening of the cylinder 1; a free piston 20 slidably inserted into an inner periphery of the cylinder 1 and dividing an interior of the cylinder 1 into a liquid chamber R filled with a working fluid and a gas chamber G filled with a gas; and a piston 8 provided at the tip of the rod 3 and dividing the interior of the liquid chamber R into two chambers, an extension side chamber R1 and a compression side chamber R2.

Further, the piston 8 is provided with a passage 9 that communicates the extension side chamber R1 and the compression side chamber R2, and a valve V that gives resistance to the flow of liquid through the passage 9. Thus, when the shock absorber main body 4 of the present embodiment expands and contracts, the valve V generates a damping force and exerts a resistance force on the flow of the working fluid when the working fluid flows from the compression-side chamber to the expansion-side chamber in the cylinder 1 through the passage. Further, the gas chamber G expands and contracts by the axial movement of the free piston 20, and can compensate for a change in the internal volume of the cylinder corresponding to the rod-passing volume and a change in the volume of the working fluid due to a change in temperature, which are caused by the expansion and contraction operation of the shock absorber main body 4.

In the present embodiment, the shock absorber D is of a single-cylinder type, but may be of a double-cylinder type in which a housing is provided on the outer periphery of the cylinder 1, and a liquid reservoir is formed between the cylinder 1 and the housing to compensate for a change in the internal volume of the cylinder corresponding to the rod stroke volume caused by the expansion and contraction operation of the shock absorber body 4.

As shown in fig. 1, a base end as a protruding side end of the rod 3 protruding from the cylinder 1 and an opposite rod side end of the cylinder 1 are provided with a side bracket 2 and another side bracket 21, respectively, which are connected to the vehicle body side or the axle side of the vehicle, by welding. Thus, the shock absorber D is disposed between the vehicle body and the axle.

Further, as shown in fig. 1, a cushion rubber 5 movable in the axial direction with respect to the rod 3 is mounted on the outer periphery of the rod 3, and a split washer 6 as a restricting member is mounted between the one side bracket 2 and the cushion rubber 5.

As shown in fig. 2 showing an end face of the X-X cut portion in fig. 1, the split gasket 6 includes a first split body 6a having a C-shaped cross section and a second split body 6b having a C-shaped cross section, which are split into right and left sides, and the first split body 6a and the second split body 6b are combined at an opening side to form a cylindrical shape. In the present embodiment, the split spacer 6 is split at the same shape in the cross-sectional view, but may be split at uneven positions so that the cylindrical shapes formed by the combination of the opening sides of the one split body 6a and the other split body 6b have different shapes.

As shown in fig. 1, the cushion rubber 5 is bonded to the annular holding member 12 to be integrated. The holding member 12 has a cylindrical sliding contact portion 12a that slides along the outer periphery of the rod 3, and a holding portion 12b that is formed by gradually expanding from the lower end of the sliding contact portion 12a in the drawing. The holding portion 12b is bonded while accommodating the upper end of the cushion rubber 5 in the figure. Further, a cylindrical projecting portion 12c capable of fitting the outer periphery of the split spacer 6 therein is provided on the outer peripheral end of the sliding portion 12a on the side opposite to the holding portion.

As shown in fig. 1, a stopper 11 is fixed to the outer periphery of the stem 3 on the base end side, and the segment spacer 6 is sandwiched between a holding member 12 and the stopper 11. Specifically, the stopper 11 includes an annular plate portion 11a that abuts the upper end of the split gasket 6 in the drawing, and a cylindrical protruding portion 11b that protrudes from the outer peripheral side end of the annular plate portion 11a toward the cylinder 1 side and can fit the outer periphery of the split gasket 6 inside.

Therefore, as shown in fig. 1, a pair of

projections

11b and 12c capable of being fitted to the outer periphery of the split washer 6 are provided at the upper and lower sides in the axial direction of the split washer 6. As a result, the split gasket 6 is fitted and restrained in the protruding portion 11b of the stopper 11 at the upper end outer periphery in fig. 1, and in the protruding portion 12c of the holding member 12 at the lower end outer periphery in fig. 1.

As shown in fig. 1, the shock absorber D is provided with one side spring receiver 13 disposed on the outer periphery of the cushion rubber 5 and having an inner peripheral end portion abutting against the lower end of the holding portion 12b in the figure, and another annular side spring receiver 14 fixed to the outer periphery of the cylinder 1. A suspension spring S for biasing the one spring bracket 13 toward the opposite side of the cylinder is interposed between the

spring brackets

13 and 14. Thereby, the suspension spring S biases the damper main body 4 in the extending direction via the holding member 12, the spacer 6, and the stopper 11.

In the damper D, when the rod 3 enters the cylinder 1 at the maximum contraction, the cushion rubber 5 and the cover 10 of the damper main body 4 are in contact with each other, and the impact generated at the maximum contraction can be relaxed by the elastic deformation of the cushion rubber 5.

Further, by changing the attached split washer 6 to an arbitrary axial length, the distance between the cushion rubber 5 and the cover 10 when the shock absorber D is maximally extended can be adjusted, and therefore the stroke amount of the rod 3 can be adjusted to an arbitrary size.

Next, a method of assembling the shock absorber D of the present embodiment will be described. First, the holding member 12, the cushion rubber 5, the one-side spring bracket 13, and the suspension spring S are attached to the outer periphery of the rod 3, the piston 8 and the valve V are assembled to the rod 3 on the tip end side thereof, and the one-side bracket 2 and the stopper 11 are fixed to the base end side. Further, between the piston 8 and the cushion rubber 5 on the outer periphery of the rod 3, the rod guide 7 and the cap 10 are slidably provided with respect to the rod 3.

Also, in this state, the rod 3 is inserted into the cylinder 1 from the leading end side, and the rod guide 7 is pressed into the cylinder 1 while the piston 8 is inserted into the cylinder 1. At this time, as shown in fig. 3, since the segment spacer 6 is not attached to the outer periphery of the rod 3, the cushion rubber 5 and the cap 10 can be disposed on the base end side of the rod 3 having only the length of the segment spacer 6 in the axial direction. Therefore, when the rod guide 7 is pressed into the cylinder 1, a space for placing a jig for pressing the rod guide 7 can be secured between the cap 10 and the rod guide 7.

Further, the lower end of the suspension spring S in fig. 1 is seated on the other side spring holder 14 provided on the outer periphery of the cylinder 1, whereby the suspension spring S is sandwiched between the one side spring holder 13 and the other side spring holder 14, and the suspension spring S is disposed on the outer periphery of the cylinder 1.

Then, the cap 10 is mounted on the open end of the cylinder 1, and the damper body 4 is completed.

Next, the holding member 12 is moved to the cylinder 1 side against the biasing force of the suspension spring S, and the one split body 6a and the other split body 6b are aligned with each other on the opening side from the outer peripheral side of the rod 3 while leaving a gap between the holding member 12 and the stopper 11, and enter the gap. Since the holding member 12 is biased toward the stopper 11 by the biasing force of the suspension spring S, the one side divided body 6a and the other side divided body 6b are sandwiched between the holding member 12 and the stopper 11.

In this way, since the split washer 6 is split into the one split body 6a and the other split body 6b, the split washer 6 can be attached to the outer periphery of the rod 3 even after the completion of the damper body 4. Further, the axial movement of the holding member 12 holding the cushion rubber 5 is restricted, and the

respective split bodies

6a and 6b of the split washer 6 do not fall off from the outer periphery of the rod 3.

Further, since the split spacer 6 of the present embodiment is restrained by the upper end outer periphery being fitted into the protruding portion 11b of the stopper 11 in fig. 1 and the lower end outer periphery being fitted into the protruding portion 12c of the holding member 12 in fig. 1, the split spacer 6 does not fall off from the outer periphery of the rod 3.

As described above, the buffer D includes: a suspension spring S disposed on an outer periphery of the damper main body 4 and biasing the damper main body 4 in an extending direction; a cushion rubber 5 mounted in the axial direction movably with respect to the outer periphery of the rod 3; and a split washer 6 which can be fitted between the one side bracket 2 and the cushion rubber 5 from the outer periphery of the rod 3 in the rod 3, and which serves as a restricting member that restricts movement of the cushion rubber 5 in the opposite direction of the cylinder, so that the cushion rubber 5 and the split washer 6 are urged toward the opposite side of the cylinder by the suspension spring S.

According to this structure, even after the bumper body 4 is completed, the division shim 6 can be attached to the outer periphery of the rod 3. Therefore, when the rod guide 7 is pushed into the cylinder 1, the split washer 6 is not installed, and if the cushion rubber 5 moves to the opposite side of the rod 3 from the cylinder, a space for placing a jig for pushing the rod guide 7 into the cylinder 1 can be secured.

Therefore, even if the shock absorber D is provided with a restricting member for restricting the movement of the cushion rubber 5 in the direction opposite to the cylinder, the stroke of the rod 3 is set short, and the one side bracket 2 is welded and fixed to the rod 3, the assembly thereof is easy. Therefore, the cost involved in manufacturing the shock absorber D can be reduced as compared with when the bracket is fastened to the rod with screws as in the related art.

Further, in the shock absorber D, a pair of

projections

11b and 12c capable of being fitted to the outer periphery of the split shim 6 are provided at the upper and lower sides in the axial direction of the split shim 6. According to this configuration, the outer periphery of the segment spacer 6 can be restricted by the protruding

portions

11b and 12c, and therefore the segment spacer 6 can be more prevented from falling off from the outer periphery of the rod 3.

The protruding

portions

11b and 12c are formed in a cylindrical shape at the outer peripheral end of the annular plate portion 11a and the sliding contact portion 12a, respectively, but the shape of the protruding

portions

11b and 12c is not limited to a cylindrical shape, and, for example, at least two or more curved plates may be provided in the circumferential direction of the annular plate portion 11a or the sliding contact portion 12a, and curved along the outer periphery of the rod 3.

In the present embodiment, the projecting

portions

11b and 12c prevent the split pad 6 from coming off, but an annular groove may be provided on the outer periphery of the split pad, and a snap ring may be attached to the annular groove to prevent the split pad 6 from coming off.

However, the split washer 6 is biased to the cylinder reverse side by the suspension spring S and fixed so as not to be separated from the outer periphery of the rod 3, and therefore, the above-described structures of the projecting

portions

11b and 12c, the snap ring, and the like may be omitted.

In the present embodiment, the right and left dividable pads 6 are used as the restricting members, but if the restricting members can be added after the outer periphery of the rod 3, the restricting members are not limited to the dividable pads 6, and may be split pads 22 having a C-shaped cross section, for example, as shown in fig. 4. Specifically, the split washer 22 is configured such that an opening 22b is provided in a part of a cylindrical washer body 22a, and the split washer 22b is temporarily spread when mounting, so that the mounting can be performed from the outer periphery of the rod 3.

In this way, in the case where the restricting member is the opening spacer 22, since the opening width of the opening 22b is smaller than the diameter of the rod 3, there is no fear that the restricting member is detached from the outer periphery of the rod 3.

Although not shown, the restricting member may be a C-pin. Specifically, an annular groove is provided on the outer periphery of the rod 3, and a C pin is attached to the annular groove, whereby the cushion rubber 5 can be restricted from moving in the opposite direction to the cylinder. In this way, when the restricting member is the C-pin, the restricting member can be attached from the outer periphery of the rod 3, and the C-pin is less expensive than the case where the restricting member is the split washer 6 or the split washer 22, so that the manufacturing cost of the shock absorber D can be reduced.

While the preferred embodiments of the present invention have been described in detail, it is needless to say that modifications, variations and changes can be made without departing from the scope of the claims.

The present application claims priority to the patent 2017-176301, which was filed on the national patent office on day 9, 14, 2017, the entire contents of which are incorporated herein by reference.

Claims

1. A buffer is provided with a buffer body having a plurality of buffer grooves,

a damper main body having a cylinder body, and a rod movably inserted into the cylinder body and provided with a bracket at a protruding side end portion protruding from the cylinder body;

a suspension spring that is disposed on an outer periphery of the damper main body and biases the damper main body in an extending direction;

an annular holding member mounted movably in an axial direction with respect to an outer periphery of the rod and mounted with a cushion rubber;

an annular spring bracket that abuts against a cylinder-side end of the holding member and supports one end of the suspension spring; and

a restricting member that is capable of being fitted between the holder and the holding member in the rod from an outer periphery of the rod and restricts the holding member from moving in a direction opposite to the cylinder,

the holding member and the restricting member are urged to the opposite side of the cylinder by the suspension spring.

2. The buffer of claim 1,

the limiting component is a split gasket which can be split left and right.

3. The buffer of claim 2,

a pair of projections which can be fitted to the outer peripheries of the split washers are provided at upper and lower positions in the axial direction of the split washer.

4. The buffer of claim 1,

the restraining member is an open gasket.

5. The buffer of claim 1,

the restraining member is a C-pin.